U.S. patent application number 10/984021 was filed with the patent office on 2006-05-11 for modular condensation and thermal compression subsystem for power systems utilizing multi-component working fluids.
This patent application is currently assigned to KALEX, LLC. Invention is credited to Alexander I. Kalina.
Application Number | 20060096289 10/984021 |
Document ID | / |
Family ID | 36314919 |
Filed Date | 2006-05-11 |
United States Patent
Application |
20060096289 |
Kind Code |
A1 |
Kalina; Alexander I. |
May 11, 2006 |
MODULAR CONDENSATION AND THERMAL COMPRESSION SUBSYSTEM FOR POWER
SYSTEMS UTILIZING MULTI-COMPONENT WORKING FLUIDS
Abstract
New more efficient condensation and thermal compression
subsystems for power plants utilizing multi-component fluids are
disclosed that simplify the equipment needed to improve the overall
efficiency and efficiency of the condensation and thermal compress
subsystem.
Inventors: |
Kalina; Alexander I.;
(Hillsborough, CA) |
Correspondence
Address: |
ROBERT W STROZIER, P.L.L.C
PO BOX 429
BELLAIRE
TX
77402-0429
US
|
Assignee: |
KALEX, LLC
|
Family ID: |
36314919 |
Appl. No.: |
10/984021 |
Filed: |
November 8, 2004 |
Current U.S.
Class: |
60/649 |
Current CPC
Class: |
F01K 25/065
20130101 |
Class at
Publication: |
060/649 |
International
Class: |
F01K 25/06 20060101
F01K025/06 |
Claims
1. A condensation and thermal compression system comprising: a
separation subsystem comprising a separator adapted to produce a
rich vapor stream and a lean liquid stream; a heat exchange
subsystem comprising three heat exchangers and two throttle control
valves adapted to mix a pressure adjusted first portion of the lean
liquid stream with an incoming stream to form a pre-basic solution
stream, to mix a pressure adjusted second portion of the lean
liquid stream with the pre-basic solution stream to form a basic
solution stream, to bring a first portion of a pressurized fully
condensed basic solution stream into a heat exchange relationship
with the pre-basic solution stream to form a partially condensed
basic solution stream; a first condensing and pressurizing
subsystem comprising a first condenser and a first pump adapted to
fully condense the partially condensed basic solution stream to
form a fully condensed basic solution stream and to pressurize the
fully condensed basic solution stream to form a pressurized fully
condensed working fluid stream; and a second condensing and
pressurizing subsystem comprising a second condenser and a second
pump adapted to mix a second portion of the fully condensed basic
solution stream and the rich vapor stream to form an outgoing
stream, to fully condense the outgoing stream and to pressurize the
outgoing stream to a desired high pressure, where the first portion
of the lean liquid stream is pressure adjusted to have the same or
substantially the same pressure as the incoming stream and where
the second portion of the lean stream is pressure adjusted to have
the same or substantially the same pressure as the pre-basic
solution stream and where the streams comprise at least one lower
boiling component and at least one higher boiling component and the
compositions of the streams are the same or different with the
composition of the incoming stream and the outgoing stream being
the same.
2. The system of claim 1, wherein the second condensing and
pressurizing subsystem further comprising a heat exchanger adapted
to cool the rich vapor stream and heating the high pressure
outgoing working fluid stream.
3. The system of claim 1, wherein the composition of the incoming
stream or the outgoing stream is selected from the group consisting
of an ammonia-water mixture, a mixture of two or more hydrocarbons,
a mixture of two or more freons, and a mixture of hydrocarbons and
freons.
4. The system of claim 1, wherein the composition of the incoming
stream or the outgoing stream comprises a mixture of water and
ammonia.
5. A condensation and thermal compression system comprising: a
separation subsystem comprising two separators and one scrubber
adapted to produce three rich vapor streams and three lean liquid
stream and to forward the first rich vapor stream from the first
separator to the scrubber; a heat exchange subsystem comprising
three heat exchangers and five throttle control valves adapted: (7)
to mix an incoming stream and a pressure adjusted, first portion of
a first lean liquid stream from the first separator through the
first throttle control valve to form a lean mixed stream, (8) to
bring into a heat exchange relationship a heated first portion of a
first pressurized basic solution substream and the lean mixed
stream in a first heat exchanger to form a cooled lean mixed stream
and a partially vaporized, pressurized basic solution stream, (9)
to forward the partially vaporized, pressurized basic solution
stream to the first separator, (10) to mix the cooled lean mixed
stream and a pressure adjusted, second portion of the first lean
liquid stream from the first separator through the second throttle
control valve and a pressure adjusted, second lean liquid stream
from the scrubber through the third throttle control valve to form
a pre-basic solution stream, (11) to bring into a heat exchange
relationship the pre-basic solution stream and a pre-heated, first
portion of the first pressurized basic solution substream in the
second heat exchanger to form a cooled pre-basic solution stream
and the heated first portion of the first pressurized basic
solution substream, (12) to forward a second portion of the
pre-heated first pressurized basic solution substream to the
scrubber, (13) to forward a third portion of the pre-heated first
pressurized basic solution substream to the second separator
through the fourth throttle control valve, (14) to bring into a
heat exchange relationship the cooled pre-basic solution stream and
the first pressurized basic solution substream in a third heat
exchanger to form a cooler pre-basic solution stream and the
pre-heated first pressurized basic solution substream, and (15) to
mix the cooler pre-basic solution stream and a pressure adjusted
third lean liquid stream from the second separation through the
fifth throttle control valve to form a partially condensed basic
solution stream, a first condensing and pressurizing subsystem
comprising a first condenser and three pumps adapted: (1) to fully
condense the partially condensed basic solution stream in the first
condenser using a first external coolant stream to form a fully
condensed basic solution stream; (2) to split the fully condensed
basic solution stream into a first fully condensed basic solution
substream and a second fully condensed basic solution substream;
(3) to pressurize the first fully condensed basic solution
substream through the first pump to form the first pressurized
fully condensed basic solution substream; (4) to pressurize the
second fully condensed basic solution substream through the second
pump to form a second pressurized fully condensed basic solution
substream; (5) to mix the second pressurized fully condensed basic
solution substream and the second rich vapor stream from the second
separator to form a pre-outgoing stream; (6) to pressurize the
pre-outgoing stream in the third pump to form a pressurized
pre-outgoing stream; and (7) to mix the pressurized pre-outgoing
stream with the third rich vapor stream from the scrubber to form a
partially condensed outgoing stream; and a second condensing and
pressurizing subsystem comprising a second condenser and a fourth
pump adapted to fully condense the partially condensed outgoing
stream in the second condenser using a second external coolant
stream to form a fully condensed outgoing stream and to pressurize
the fully condensed outgoing stream to a desired high pressure to
form an outgoing stream, where the streams comprise at least one
lower boiling component and at least one higher boiling component
and the compositions of the streams are the same or different with
the composition of the incoming stream and the outgoing stream
being the same.
6. The system of claim 5, wherein the second condensing and
pressurizing subsystem further comprising a fourth heat exchanger
adapted to bring the third rich vapor stream and the outgoing
stream heating the outgoing stream to a desired higher
temperature.
7. The system of claim 5, wherein the composition of the incoming
stream or the outgoing stream is selected from the group consisting
of an ammonia-water mixture, a mixture of two or more hydrocarbons,
a mixture of two or more freons, and a mixture of hydrocarbons and
freons.
8. The system of claim 5, wherein the composition of the incoming
stream or the outgoing stream comprises a mixture of water and
ammonia.
9. The system of claim 5, wherein the first condensing and
pressurizing subsystem further comprising a third condenser adapted
to fully condense a pre-outgoing stream in the third condenser
using a third external coolant stream to form a fully condensed,
pre-outgoing stream prior to being pressurized in the third pump
and mixed with the third rich vapor stream to form the partially
condensed outgoing stream.
10. The system of claim 9, wherein the second condensing and
pressurizing subsystem further comprising a fourth heat exchanger
adapted to bring the third rich vapor stream and the outgoing
stream heating the outgoing stream to a desired higher
temperature.
11. The system of claim 5, wherein the heat exchange subsystem
further comprising a fifth heat exchanger adapted to bring into a
heat exchange relationship the first portion of the first lean
liquid stream from the first separator and an external heat carrier
stream to from a heated first portion of the first lean liquid
stream prior to passing through the first throttle control valve
and being mixed with the incoming stream.
12. The system of claim 11, wherein the second condensing and
pressurizing subsystem further comprising a fourth heat exchanger
adapted to bring the third rich vapor stream and the outgoing
stream heating the outgoing stream to a desired higher
temperature.
13. The system of claim 11, wherein the first condensing and
pressurizing subsystem further comprising a third condenser adapted
to fully condense a pre-outgoing stream in the third condenser
using a third external coolant stream to form a fully condensed,
pre-outgoing stream prior to being pressurized in the third pump
and mixed with the third rich vapor stream to form the partially
condensed outgoing stream.
14. The system of claim 13, wherein the second condensing and
pressurizing subsystem further comprising a fourth heat exchanger
adapted to bring the third rich vapor stream and the outgoing
stream heating the outgoing stream to a desired higher
temperature.
15. A method comprising the steps of: a. mixing an incoming stream
and a pressure adjusted first portion of a lean liquid stream to
form a pre-basic solution stream, b. bringing the pre-basic
solution stream into a heat exchange relationship with a first
portion of a heated, pressurized basic solution stream to form a
cooled pre-basic solution stream and a partially vaporized basic
solution stream, c. mixing the cooled pre-basic solution stream and
a pressure adjusted second portion of the lean liquid stream to
form a basic solution stream, d. bringing the basic solution stream
into a heat exchange relationship with the first portion of a
pressurized fully condensed basic solution stream to form a
partially condensed basic solution stream and the heated,
pressurized basic solution stream, e. condensing the partially
condensed basic solution stream using an external coolant stream to
from a fully condensed basic solution stream, f. pressurizing the
fully condensed basic solution stream to form the pressurized fully
condensed basic solution stream, g. separating the partially
vaporized basic solution stream into a rich vapor stream and the
lean liquid stream, h. mixing the vapor steam and a second portion
of the pressurized fully condensed basic solution stream to form a
pre-outgoing stream, I. condensing the pre-outgoing stream using a
second external coolant stream to form a fully condensed,
pre-outgoing stream, and j pressurizing the fully condensed,
pre-outgoing stream to a desired high pressure to form an outgoing
stream, where the streams comprise at least one lower boiling
component and at least one higher boiling component and the
compositions of the streams are the same or different with the
composition of the incoming stream and the outgoing stream being
the same.
16. The method of claim 15, wherein the second bringing step
includes: a first heat exchange step where the basic solution
stream is brought into heat exchange relationship with a partially
heated pressurized basic solution stream to form a pre-partially
condensed basic solution stream and the heated, pressurized basic
solution stream, and a second heat exchange step where the
pre-partially condensed basic solution stream is brought into heat
exchange relationship with the first portion of the pressurized
basic solution stream to from the partially condensed basic
solution stream and a pre-heated, pressurized basic solution
stream.
17. The method of claim 15, wherein the composition of the incoming
stream or the outgoing stream is selected from the group consisting
of an ammonia-water mixture, a mixture of two or more hydrocarbons,
a mixture of two or more freons, and a mixture of hydrocarbons and
freons.
18. The method of claim 15, wherein the composition of the incoming
stream or the outgoing stream comprises a mixture of water and
ammonia.
19. A method comprising the steps of: a. mixing an incoming stream
and a pressure adjusted, first portion of a first lean liquid
stream to form a lean mixed stream, b. bringing into a heat
exchange relationship a heated first portion of a first pressurized
basic solution substream and the lean mixed stream to form a cooled
lean mixed stream and a partially vaporized, pressurized basic
solution stream, c. forwarding the partially vaporized, pressurized
basic solution stream to the first separator, d. mixing the cooled
lean mixed stream and a pressure adjusted, second portion of the
first lean liquid stream from the first separator through the
second throttle control valve and a pressure adjusted, second lean
liquid stream from the scrubber through the third throttle control
valve to form a pre-basic solution stream, e. bringing into a heat
exchange relationship the pre-basic solution stream and a
pre-heated, first portion of the first pressurized basic solution
substream in the second heat exchanger to form a cooled pre-basic
solution stream and the heated first portion of the first
pressurized basic solution substream, f. forwarding a second
portion of the pre-heated first pressurized basic solution
substream to the scrubber, g. forwarding a third portion of the
pre-heated first pressurized basic solution substream to the second
separator through the fourth throttle control valve, h. bringing
into a heat exchange relationship the cooled pre-basic solution
stream and the first pressurized basic solution substream in a
third heat exchanger to form a cooler pre-basic solution stream and
the pre-heated first pressurized basic solution substream, i.
mixing the cooler pre-basic solution stream and a pressure adjusted
third lean liquid stream from the second separation through the
fifth throttle control valve to form a partially condensed basic
solution stream, j. fully condensing the partially condensed basic
solution stream in the first condenser using a first external
coolant stream to form a fully condensed basic solution stream; k.
splitting the fully condensed basic solution stream into a first
fully condensed basic solution substream and a second fully
condensed basic solution substream; m. pressurizing the first fully
condensed basic solution substream through the first pump to form
the first pressurized fully condensed basic solution substream; o.
pressurizing the second fully condensed basic solution substream
through the second pump to form a second pressurized fully
condensed basic solution substream; q. mixing the second
pressurized fully condensed basic solution substream and the second
rich vapor stream from the second separator to form a pre-outgoing
stream; s. pressurizing the pre-outgoing stream in the third pump
to form a pressurized pre-outgoing stream; u. mixing the
pressurized pre-outgoing stream and the third rich vapor stream
from the scrubber to form a partially condensed outgoing stream; w.
fully condensing the partially condensed outgoing stream in the
second condenser using a second external coolant stream to form a
fully condensed outgoing stream; and y. pressurizing the fully
condensed outgoing stream to a desired high pressure to form an
outgoing stream, where the streams comprise at least one lower
boiling component and at least one higher boiling component and the
compositions of the streams are the same or different with the
composition of the incoming stream and the outgoing stream being
the same.
20. The method of claim 19, wherein the composition of the incoming
stream or the outgoing stream is selected from the group consisting
of an ammonia-water mixture, a mixture of two or more hydrocarbons,
a mixture of two or more freons, and a mixture of hydrocarbons and
freons.
21. The method of claim 19, wherein the composition of the incoming
stream or the outgoing stream comprises a mixture of water and
ammonia.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to a modular condensation and
thermal compression apparatus for use in power extraction
systems.
[0003] More particularly, the present invention relates to a
modular condensation and thermal compression apparatus for use in
power extraction systems, where the modular apparatus or subsystem
includes a plurality of heat exchangers, a plurality of pumps, a
plurality of throttle control valves, and at least one separator,
where the apparatus is designed to efficiently condense and
thermally compress an in-coming, low pressure, multi-component
working fluid to produce a high pressure, out-going, liquid,
multi-component working fluid and where a composition of the
in-coming fluid is the same as a composition of the out-going
fluid. The present invention also relates to a method where an
in-coming, low pressure, vapor multi-component working fluid is
converted into a high pressure, out-going, liquid multi-component
working fluid in a modular condensation and thermal system.
[0004] 2. Description of the Related Art
[0005] Power systems with thermodynamical power cycles utilizing
multi-component working fluids can attain a higher efficiency than
power systems utilizing single-component working fluids.
Multi-component working fluids condense at variable temperatures.
Such working fluids, unlike single component working fluids, have a
thermodynamical potential to perform useful work even when sent
into a condenser after expansion in a turbine.
[0006] Therefore, in the prior art, several power systems that
utilized a multi-component working fluid, were designed to have
condensation occur in special subsystems which were referred to as
distillation condensation subsystems. In this application, such a
subsystems will be referred to as a Condensation and Thermal
Compression Subsystems (CTCSS), a term that more accurately
describes the nature of such subsystems. Such subsystems all work
on the following principle: A stream of working fluid subject to
condensation enters into the CTCSS at a pressure which is
substantially lower than the pressure required for the complete
condensation of such a stream at a given ambient temperature. The
stream of working fluid is mixed with a recirculating stream of
lean solution (i.e., a stream with a substantially lower
concentration of the low-boiling component), forming a new stream
which can be fully condensed at the given ambient temperature,
(referred to as the "basic solution"). Thereafter, the basic
solution stream is pumped to a pressure which is slightly higher
than the pressure required for the condensation of the working
fluid, and is subjected to partial re-vaporization, for which heat
that was released in the process of condensation is utilized. Then,
the partially vaporized basic solution stream is separated into a
lean liquid stream having a reduced concentration of the
low-boiling component and a rich vapor stream having a higher
concentration of the low-boiling component. The lean liquid stream
is then mixed with the condensing stream of working solution (as
described above), while the rich vapor stream is combined with a
portion of the basic solution stream to reconstitute the initial
composition of the working fluid, which is then fully
condensed.
[0007] In U.S. Pat. No. 4,489,563, the most basic and elementary
CTCSS has been described. In this very simple CTCSS, heat from rich
vapor stream and lean liquid stream produced by partial
re-vaporization is not recuperated, drastically reducing the
efficiency of this simple CTCSS.
[0008] In other prior art including U.S. Pat. Nos. 4,548,043;
4,586,340; 4,604,867; 4,763,480; 5,095,708; and 5,572,871, more
complicated and elaborate CTCSSs were disclosed. However, all of
these prior art CTCSS have one common drawback. In order to
increase efficiency via better heat recuperation, they require
multiple separate heat exchangers. In many cases, the complexity
and high price of such CTCSS are not justified by the increased
efficiency that the CTCSS provides.
[0009] Thus, there is a need in the art for a Condensation and
Thermal Compression Subsystem (CTCSS) that has improved efficiency
off-setting the additional cost.
SUMMARY OF THE INVENTION
[0010] The present invention provides a system including a
plurality of heat exchangers, a plurality of pumps, a plurality of
throttle valves and at least one separator, where the system
efficiently converts an in-coming, low pressure, multi-component
working fluid stream into a high pressure, out-going, liquid
multi-component working fluid stream. The system is ideally suited
for condensation of a spent vapor multi-component working fluid
stream derived from an energy extraction system or turbine system
such as the extraction systems described in United States Patent
and Pending Patent Application Nos.
[0011] The present invention also provides a minimally configured
CTCSS system including five heat exchangers, one separator, two
pumps, two throttle control valves, two mixing valves, three
splitter valves. The CTCSS is supplied an incoming vapor
multi-component working fluid stream which is then made lean via
the addition of two lean liquid multi-component streams to form a
partially condensed basic solution stream. The partially condensed
basic solution stream is then fully condensed in one of the five
heat exchangers using an external coolant. The fully condensed
basic solution stream is then pressurized and split into two
substreams. Heat is transferred from the lean streams to one of the
pressurized basic solution streams, which is then separated into a
rich vapor stream and the two lean liquid streams in three of the
five heat exchangers. The rich vapor stream and the other
pressurized basic solution stream is mixed to form a partially
condensed outgoing multi-component stream, which is fully condensed
in one of the five heat exchangers via a coolant stream and then
pressurized to a desired high pressure to form a liquid, high
pressure multi-component working fluid stream adapted for
vaporization by an external heat source and energy extraction to
generate electricity.
[0012] The present invention provides a method condensing and
thermally compressing a spent vapor, multi-component working fluid
stream including the steps of forming a plurality of lean streams
form the spent vapor, multi-component working fluid stream and
transferring thermal energy from the plurality of lean streams to a
basic solution stream to form a partially liquified, lower pressure
basic solution stream. The partially condensed, lower pressure
basic solution stream is then fully condensed with an external
coolant stream. The fully condensed lower pressure basic solution
stream is then pumped to a higher pressure and split into a first
and second higher pressure basic solution substream. The first
higher pressure basic solution substream absorbs the thermal energy
from the plurality of lean streams. The heated first higher
pressure, basic solution substream is then separated into a rich
vapor stream and a lean liquid stream. The lean liquid stream is
split into two lean liquid substreams. The first lean liquid
substream is combined with the spent vapor, multi-component working
fluid stream to form a first lean stream which transfers a portion
of its thermal energy to the first higher pressure basic solution
stream. The second lean liquid substream is mixed with the cooled
spent, vapor multi-component working fluid stream to form a second
lean stream, which is further cooled by transferring its thermal
energy to the first higher pressure, basic solution stream to the
partially liquified, lower pressure basic solution stream. The
second higher pressure, basic solution stream is mixed with the
rich vapor stream to form a liquid multi-component working fluid
stream, which is fully condensed by a second coolant stream and
pressurized to a desire higher pressure to form a high pressure,
liquid multi-component working fluid stream.
[0013] The present invention provides a method for converting
thermal energy into mechanical and/or electrical energy including
the steps of condensing a spent multi-component fluid stream to
form a liquid multi-component fluid stream, vaporizing the liquid
multi-component fluid stream to form a fully vaporized
multi-component fluid stream and extracting energy from the fully
vaporized multi-component fluid stream to form the spent
multi-component fluid stream.
[0014] The present invention provides a condensation and thermal
compression system including: (1) a separation subsystem comprising
a separator adapted to produce a rich vapor stream and a lean
liquid stream; (2) a heat exchange subsystem comprising three heat
exchangers and two throttle control valves; (3) a first condensing
and pressurizing subsystem comprising a first condenser and a first
pump; and (4) a second condensing and pressurizing subsystem
comprising a second condenser and a second pump. The heat exchange
subsystem is adapted to mix a pressure adjusted first portion of
the lean liquid stream with an incoming stream to form a pre-basic
solution stream, to mix a pressure adjusted second portion of the
lean liquid stream with the pre-basic solution stream to form a
basic solution stream, to bring a first portion of a pressurized
fully condensed basic solution stream into a heat exchange
relationship with the pre-basic solution stream to form a partially
condensed basic solution stream. The first condensing and
pressurizing subsystem is adapted to fully condense the partially
condensed basic solution stream to form a fully condensed basic
solution stream and to pressurize the fully condensed basic
solution stream to form a pressurized fully condensed working fluid
stream. The second condensing and pressurizing subsystem is adapted
to mix a second portion of the fully condensed basic solution
stream and the rich vapor stream to form an outgoing stream, to
fully condense the outgoing stream and to pressurize the outgoing
stream to a desired high pressure. The first portion of the lean
liquid stream is pressure adjusted to have the same or
substantially the same pressure as the incoming stream and where
the second portion of the lean stream is pressure adjusted to have
the same or substantially the same pressure as the pre-basic
solution stream and where the streams comprise at least one lower
boiling component and at least one higher boiling component and the
compositions of the streams are the same or different with the
composition of the incoming stream and the outgoing stream being
the same. The second condensing and pressurizing subsystem can
further comprise a heat exchanger adapted to cool the rich vapor
stream and heating the high pressure outgoing working fluid
stream.
[0015] The present invention also provides a condensation and
thermal compression system including: (1) a separation subsystem
comprising two separators and one scrubber adapted to produce three
rich vapor streams and three lean liquid stream and to forward the
first rich vapor stream from the first separator to the scrubber;
(2) a heat exchange subsystem comprising three heat exchangers and
five throttle control valves; (3) a first condensing and
pressurizing subsystem comprising a first condenser and three
pumps; and (4) a second condensing and pressurizing subsystem
comprising a second condenser and a fourth pump adapted to fully
condense the partially condensed outgoing stream in the second
condenser using a second external coolant stream to form a fully
condensed outgoing stream and to pressurize the fully condensed
outgoing stream to a desired high pressure to form an outgoing
stream. The heat exchange subsystem is adapted: (1) to mix an
incoming stream and a pressure adjusted, first portion of a first
lean liquid stream from the first separator through the first
throttle control valve to form a lean mixed stream, (2) to bring
into a heat exchange relationship a heated first portion of a first
pressurized basic solution substream and the lean mixed stream in a
first heat exchanger to form a cooled lean mixed stream and a
partially vaporized, pressurized basic solution stream, (3) to
forward the partially vaporized, pressurized basic solution stream
to the first separator, (4) to mix the cooled lean mixed stream and
a pressure adjusted, second portion of the first lean liquid stream
from the first separator through the second throttle control valve
and a pressure adjusted, second lean liquid stream from the
scrubber through the third throttle control valve to form a
pre-basic solution stream, (5) to bring into a heat exchange
relationship the pre-basic solution stream and a pre-heated, first
portion of the first pressurized basic solution substream in the
second heat exchanger to form a cooled pre-basic solution stream
and the heated first portion of the first pressurized basic
solution substream, (6) to forward a second portion of the
pre-heated first pressurized basic solution substream to the
scrubber, (7) to forward a third portion of the pre-heated first
pressurized basic solution substream to the second separator
through the fourth throttle control valve, (8) to bring into a heat
exchange relationship the cooled pre-basic solution stream and the
first pressurized basic solution substream in a third heat
exchanger to form a cooler pre-basic solution stream and the
pre-heated first pressurized basic solution substream, and (9) to
mix the cooler pre-basic solution stream and a pressure adjusted
third lean liquid stream from the second separation through the
fifth throttle control valve to form a partially condensed basic
solution stream. The first condensing and pressurizing subsystem is
adapted: (1) to fully condense the partially condensed basic
solution stream in the first condenser using a first external
coolant stream to form a fully condensed basic solution stream; (2)
to split the fully condensed basic solution stream into a first
fully condensed basic solution substream and a second fully
condensed basic solution substream; (3) to pressurize the first
fully condensed basic solution substream through the first pump to
form the first pressurized fully condensed basic solution
substream; (4) to pressurize the second fully condensed basic
solution substream through the second pump to form a second
pressurized fully condensed basic solution substream; (5) to mix
the second pressurized fully condensed basic solution substream and
the second rich vapor stream from the second separator to form a
pre-outgoing stream; (6) to pressurize the pre-outgoing stream in
the third pump to form a pressurized pre-outgoing stream; and (7)
to mix the pressurized pre-outgoing stream with the third rich
vapor stream from the scrubber to form a partially condensed
outgoing stream. The streams comprise at least one lower boiling
component and at least one higher boiling component and the
compositions of the streams are the same or different with the
composition of the incoming stream and the outgoing stream being
the same. The second condensing and pressurizing subsystem can
further comprise a fourth heat exchanger adapted to bring the third
rich vapor stream and the outgoing stream heating the outgoing
stream to a desired higher temperature.
[0016] The first condensing and pressurizing subsystem can further
comprise a third condenser adapted to fully condense a pre-outgoing
stream in the third condenser using a third external coolant stream
to form a fully condensed, pre-outgoing stream prior to being
pressurized in the third pump and mixed with the third rich vapor
stream to form the partially condensed outgoing stream. With the
modification to the first condensing and pressurizing subsystem,
the second condensing and pressurizing subsystem further comprising
a fourth heat exchanger adapted to bring the third rich vapor
stream and the outgoing stream heating the outgoing stream to a
desired higher temperature.
[0017] The heat exchange subsystem can further comprise a fifth
heat exchanger adapted to bring into a heat exchange relationship
the first portion of the first lean liquid stream from the first
separator and an external heat carrier stream to from a heated
first portion of the first lean liquid stream prior to passing
through the first throttle control valve and being mixed with the
incoming stream. With this modification to the heat exchange
subsystem the second condensing and pressurizing subsystem further
comprising a fourth heat exchanger adapted to bring the third rich
vapor stream and the outgoing stream heating the outgoing stream to
a desired higher temperature. With this modification to the heat
exchange subsystem, the first condensing and pressurizing subsystem
further comprising a third condenser adapted to fully condense a
pre-outgoing stream in the third condenser using a third external
coolant stream to form a fully condensed, pre-outgoing stream prior
to being pressurized in the third pump and mixed with the third
rich vapor stream to form the partially condensed outgoing stream.
With this modification to the first condensing and pressurizing
subsystem, the second condensing and pressurizing subsystem further
comprising a fourth heat exchanger adapted to bring the third rich
vapor stream and the outgoing stream heating the outgoing stream to
a desired higher temperature.
[0018] The present invention provides a method including mixing an
incoming stream and a pressure adjusted first portion of a lean
liquid stream to form a pre-basic solution stream. The pre-basic
solution stream is then brought into a heat exchange relationship
with a first portion of a heated, pressurized basic solution stream
to form a cooled pre-basic solution stream and a partially
vaporized basic solution stream. The cooled pre-basic solution
stream and a pressure adjusted second portion of the lean liquid
stream are mixed to form a basic solution stream. The basic
solution stream is brought into a heat exchange relationship with
the first portion of a pressurized fully condensed basic solution
stream to form a partially condensed basic solution stream and the
heated, pressurized basic solution stream. The partially condensed
basic solution stream is condensed using an external coolant stream
to from a fully condensed basic solution stream. The fully
condensed basic solution stream is pressurized to form the
pressurized fully condensed basic solution stream. The partially
vaporized basic solution stream is separated into a rich vapor
stream and the lean liquid stream. The vapor steam and a second
portion of the pressurized fully condensed basic solution stream
are mixed to form a pre-outgoing stream. The pre-outgoing stream
using a second external coolant stream is condensed to form a fully
condensed, pre-outgoing stream. The fully condensed, pre-outgoing
stream is pressurized to a desired high pressure to form an
outgoing stream. The streams comprise at least one lower boiling
component and at least one higher boiling component and the
compositions of the streams are the same or different with the
composition of the incoming stream and the outgoing stream being
the same. The second bringing step includes a first heat exchange
step where the basic solution stream is brought into heat exchange
relationship with a partially heated pressurized basic solution
stream to form a pre-partially condensed basic solution stream and
the heated, pressurized basic solution stream, and a second heat
exchange step where the pre-partially condensed basic solution
stream is brought into heat exchange relationship with the first
portion of the pressurized basic solution stream to from the
partially condensed basic solution stream and a pre-heated,
pressurized basic solution stream.
[0019] The present invention also provides a method including
mixing an incoming stream and a pressure adjusted, first portion of
a first lean liquid stream to form a lean mixed stream. A heated
first portion of a first pressurized basic solution substream and
the lean mixed stream are brought into a heat exchange relationship
to form a cooled lean mixed stream and a partially vaporized,
pressurized basic solution stream. The partially vaporized,
pressurized basic solution stream is forwarded to the first
separator. The cooled lean mixed stream and a pressure adjusted,
second portion of the first lean liquid stream from the first
separator through the second throttle control valve and a pressure
adjusted, second lean liquid stream from the scrubber through the
third throttle control valve are mixed to form a pre-basic solution
stream. The pre-basic solution stream and a pre-heated, first
portion-of the first pressurized basic solution substream are
brought into a heat exchange relationship to form a cooled
pre-basic solution stream and the heated first portion of the first
pressurized basic solution substream. A second portion of the
pre-heated first pressurized basic solution substream is forwarded
to the scrubber. A third portion of the pre-heated first
pressurized basic solution substream is forwarded to the second
separator through the fourth throttle control valve. The cooled
pre-basic solution stream and the first pressurized basic solution
substream are brought into a heat exchange relationship in a third
heat exchanger to form a cooler pre-basic solution stream and the
pre-heated first pressurized basic solution substream. The cooler
pre-basic solution stream and a pressure adjusted third lean liquid
stream from the second separation through the fifth throttle
control valve are mixed to form a partially condensed basic
solution stream. The partially condensed basic solution stream in
the first condenser using a first external coolant stream is fully
condensed to form a fully condensed basic solution stream. The
fully condensed basic solution stream is split into a first fully
condensed basic solution substream and a second fully condensed
basic solution substream. The first fully condensed basic solution
substream through the first pump is pressurized to form the first
pressurized fully condensed basic solution substream. The second
fully condensed basic solution substream through the second pump is
pressurized to form a second pressurized fully condensed basic
solution substream. The second pressurized fully condensed basic
solution substream and the second rich vapor stream from the second
separator are mixed to form a pre-outgoing stream. The pre-outgoing
stream in the third pump is pressurized to form a pressurized
pre-outgoing stream. The pressurized pre-outgoing stream and the
third rich vapor stream from the scrubber are mixed to form a
partially condensed outgoing stream. The partially condensed
outgoing stream is fully condensed in the second condenser using a
second external coolant stream to form a fully condensed outgoing
stream. The fully condensed outgoing stream is pressurized to a
desired high pressure to form an outgoing stream. The streams
comprise at least one lower boiling component and at least one
higher boiling component and the compositions of the streams are
the same or different with the composition of the incoming stream
and the outgoing stream being the same.
[0020] The present invention includes a power generation system
including a modular condensation and thermal compression subsystem
of this invention, a vaporization subsystem and an energy
extraction subsystem.
[0021] The present invention method includes a step of condensing a
spent working fluid stream from an energy extraction subsystem to
form a fully condensed working fluid stream, vaporizing the fully
condensed working fluid stream using an external heat source stream
to form a fully vaporizing working fluid stream, converting the
thermal energy in the vaporized working fluid stream to a useable
form of energy and repeating the cycle.
DESCRIPTION OF THE DRAWINGS
[0022] The invention can be better understood with reference to the
following detailed description together with the appended
illustrative drawings in which like elements are numbered the
same:
[0023] FIG. 1 depicts a block diagram of a preferred embodiment of
Variant 1a of a condensation and thermal compression
subsystems;
[0024] FIG. 2 depicts a block diagram of another preferred
embodiment of Variant 1b of a condensation and thermal compression
subsystems;
[0025] FIG. 3 depicts a block diagram of a preferred embodiment of
Variant 2a of a condensation and thermal compression
subsystems;
[0026] FIG. 4 depicts a block diagram of a preferred embodiment of
Variant 2b of a condensation and thermal compression
subsystems;
[0027] FIG. 5 depicts a block diagram of a preferred embodiment of
Variant 3a of a condensation and thermal compression
subsystems;
[0028] FIG. 6 depicts a block diagram of a preferred embodiment of
Variant 3b of a condensation and thermal compression
subsystems;
[0029] FIG. 7 depicts a block diagram of a preferred embodiment of
Variant 4a of a condensation and thermal compression
subsystems;
[0030] FIG. 8 depicts a block diagram of a preferred embodiment of
Variant 4b of a condensation and thermal compression
subsystems;
[0031] FIG. 9 depicts a block diagram of a preferred embodiment of
Variant 5a of a condensation and thermal compression subsystems;
and
[0032] FIG. 10 depicts a block diagram of a preferred embodiment of
Variant 5b of a condensation and thermal compression
subsystems.
DETAILED DESCRIPTION OF THE INVENTION
[0033] The inventors has found that Condensation and Thermal
Compression Subsystems (CTCSS) having an effective increase in
efficiency that fully justifies the cost in terms of complexity and
price of the proposed CTCSS can be realized for a wide variety of
power producing plants. The inventor has designed the system of
this invention to be modular, which allows one skilled in the art
to choose to exclude specific modular components, simplifying the
final system, and thus optimizing the system in term of efficiency,
cost and complexity for each individual power system being
designed.
[0034] In many systems, apart from the heat potential of the
condensing stream of working fluid, additional, external
low-temperature heat is available. Such heat, which cannot be
utilized directly in a power system, can be utilized by the
proposed CTCSS of this invention, thus increasing the CTCSS
efficacy. Preferred embodiments of the system of this invention,
therefore, incorporate the optional use of such external heat to
further enhance CTCSS efficiency.
[0035] The present invention broadly relates to a Condensation and
Thermal Compression Subsystems (CTCSS) including a plurality of
heat exchanger, a plurality of pumps, a plurality of throttle
control valves, a plurality of mixing valves and splitter valves,
one or two separators, and an optional scrubber. In a minimal
preferred embodiment, the CTCSS includes five heat exchangers, two
pumps, two throttle control valves, three mixing valve, two
splitter valves, and a separator. In a maximal preferred
embodiment, the CTCSS includes eight heat exchangers, four pumps,
five throttle control valves, two separators, and a scrubber.
[0036] The present invention broadly relates to system including a
Condensation and Thermal Compression Subsystems (CTCSS) of this
invention, a multi-component vaporizing subsystem and an energy
extraction subsystem.
[0037] The present invention broadly relates to a method for
condensation and thermal compression including the steps of
supplying an incoming low pressure, vapor multi-component working
fluid stream from an energy extraction subsystem. The incoming
vapor multi-component working fluid stream is then made lean via
the addition of a plurality of lean liquid multi-component streams
to form a pre-basic solution stream and finally a partially
condensed basic solution stream. The partially condensed basic
solution stream is fully condensed using an external coolant in a
first heat exchange process. The fully condensed basic solution
stream is then pressurized and split into two substreams. Heat is
transferred from the pre-basic solution and basic solution to one
of the pressurized basic solution substreams in a plurality of heat
exchange processes. The heated and pressurized basic solution
substream is then separated into a rich vapor stream and the
plurality of lean liquid streams. The rich vapor stream and the
other pressurized basic solution stream is mixed to form a
partially condensed outgoing multi-component stream, which is then
fully condensed in another heat exchange process via a coolant
stream and then pressurized to a desired high pressure to form a
liquid, high pressure multi-component working fluid stream adapted
for vaporization by an external heat source and energy extraction
to generate electricity.
[0038] The present invention broadly relates to a method for power
extraction including the steps condensing a spent multi-component
fluid stream to form a liquid multi-component fluid stream,
vaporizing the liquid multi-component fluid stream to form a fully
vaporized multi-component fluid stream and extracting energy from
the fully vaporized multi-component fluid stream to form the spent
multi-component fluid stream.
[0039] The working fluid used in the systems of this inventions is
a multi-component fluid that comprises a lower boiling point
material--the low boiling component--and a higher boiling point
material--the high boiling component. Preferred working fluids
include, without limitation, an ammonia-water mixture, a mixture of
two or more hydrocarbons, a mixture of two or more freons, a
mixture of hydrocarbons and freons, or the like. In general, the
fluid can comprise mixtures of any number of compounds with
favorable thermodynamic characteristics and solubilities. In a
particularly preferred embodiment, the fluid comprises a mixture of
water and ammonia.
[0040] The present invention also includes piping interconnecting
the components that make up the systems and includes mixing valves
that combine two or more streams into a single stream and splitting
valves that divide a single stream into two or more streams. These
valves are generally a function of the exact CTCSS being designed
and one of ordinary skill in the art will know the criteria of each
valve for a given CTCSS configuration.
CTCSS Variant 1a
[0041] Referring now to FIG. 1, a preferred embodiment of a CTCSS
of this invention, generally 100, is shown and is referred to
herein as Variant 1a. Variant 1a represents a very comprehensive
variant of the CTCSSs of this invention.
[0042] The operation of Variant 1a of the CTCSS of this invention
is now described.
[0043] A stream S100 having parameters as at a point 138, which can
be in a state of superheated vapor or in a state of saturated or
slightly wet vapor, enters into the CTCSS 100. The stream S100
having the parameters as at the point 138 is mixed with a first
mixed stream S102 having parameters as at a point 71, which is in a
state of a liquid-vapor mixture (as describe more fully herein),
forming a first combined stream S104 having parameters as at a
point 38. If the stream S100 having the parameters as at the point
138 is in a state of saturated vapor, then a temperature of the
stream S102 having the parameters as at the point 71 must be chosen
in such a way as to correspond to a state of saturated vapor. As a
result, the stream S104 having the parameters as at the point 38
will be in a state of a slightly wet vapor. Alternatively, if the
stream S100 having the parameters as at the point 138 is in a state
of superheated vapor, then stream S102 having the parameters of at
the point 71 must be chosen in such a way that the resulting stream
S104 having the parameters as at a point 38 should be in, or close
to, a state of saturated vapor, where close to means the state of
the vapor is within 5% of the saturated vapor state for the vapor.
In all cases, the parameters of the stream S102 at the point 71 are
chosen in such a way as to maximize a temperature of the stream
S104 at the point 38.
[0044] Thereafter, the stream S104 having the parameters as at the
point 38 passes through a first heat exchanger HE1, where it is
cooled and partially condensed and releases heat in a first heat
exchange process, producing a second mixed stream S106 having
parameters as at a point 15. The stream S106 having the parameters
as at the point 15 is then mixed with a stream S108 having
parameters as at a point 8, forming a stream S110 having parameters
as at a point 16. In the preferred embodiment of this system, the
temperatures of the streams S108, S106 and S110 having parameters
of the points 8, 15, and 16, respectively, are equal or very close,
within about 5%. A concentration of the low-boiling component in
stream S108 having the parameters as at the point 8 is
substantially lower than a concentration of the low boiling
component in the stream S106 having the parameters as at the point
15. As a result, a concentration of the low boiling component in
the stream S110 having the parameters as at the point 16 is lower
than the concentration of the low boiling component of the stream
S106 having the parameters as at the point 15, i.e., stream S110
having the parameters as at the point 16 is leaner than stream S106
having the parameters as at the point 15.
[0045] The stream S110 having the parameters as at the point 16
then passes through a second heat exchanger HE2, where it is
further condensed and releasing heat in a second heat exchange
process, forming a stream S112 having parameters as at a point 17.
The stream S112 having the parameters as at the point 17 then
passes through a third heat exchanger HE3, where it is further
condensed in a third heat exchange process to form a stream S114
having parameters as at a point 18. At the point 18, the stream
S114 is partially condensed, but its composition, while
substantially leaner that the compositions of the stream S100 and
S104 having the parameters as at the points 138 and 38, is such
that it cannot be fully condensed at ambient temperature. The
stream S114 having the parameters as at the point 18 is then mixed
with a stream S116 having parameters as at a point 41, forming a
stream S118 having parameters as at a point 19. The composition of
the stream S118 having the parameters as at the point 19 is such
that it can be fully condensed at ambient temperature.
[0046] The stream S118 having the parameters as at the point 19
then passes through a low pressure condenser HE4, where it is
cooled in a fourth heat exchange process in counterflow with a
stream S120 of cooling water or cooling air having initial
parameters as at a point 51 and final parameters as at a point 52,
becoming fully condensed, to form a stream S122 having parameters
as at a point 1. The composition of the stream S122 having the
parameters as at the point 1, referred to herein as the "basic
solution," is substantially leaner than the composition of the
stream S100 having the parameters at the point 138, which entered
the CTCSS 100. Therefore, the stream S122 having the parameters as
at the point 1 must be distilled at an elevated pressure in order
to produce a stream having the same composition as at point 138,
but at an elevated pressure that will allow the stream to fully
condense.
[0047] The stream S122 having the parameters as at the point 1 is
then divided into two substreams S124 and S126 having parameters as
at points 2 and 4, respectively. The stream S124 having the
parameters as at the point 2 enters into a circulating fourth pump
P4, where it is pumped to an elevated pressure forming a stream
S128 having parameters as at a point 44, which correspond to a
state of subcooled liquid. Thereafter, the stream S128 having the
parameters as at the point 44 passes through a third heat exchanger
HE3 in counterflow with the stream S112 having the parameters as at
the point 17 in a third heat exchange process as described above,
is heated forming a stream S130 having parameters as at a point 14.
The stream S130 having the parameters as at the point 14 is in, or
close to, a state of saturated liquid. Again, the term close to
means that the state of the stream S130 is within 5% of being a
saturated liquid. Thereafter, the stream S130 having parameters as
at point 14 is divided into two substreams S132 and S134 having
parameters as at points 13 and 22, respectively. The stream S134
having the parameters as at the point 22 is then divided into two
substreams S136 and S138 having parameters as at points 12 and 21,
respectively. The stream S136 having the parameters as at the point
12 then passes through the second heat exchanger HE2, where it is
heated and partially vaporized in counterflow to the stream S100
having the parameters as at the point 16 as described above in a
second heat exchange process, forming a stream S140 having
parameters as at a point 11. The stream S140 having the parameters
as at the point 11 then passes through the first heat exchanger
HE1, where it is further heated and vaporized in counterflow to the
stream S104 having stream 38 as described above in a first heat
exchange process, forming a stream S142 having parameters as at a
point 5.
[0048] The stream S142 having the parameters as at the point 5,
which is in a state of a vapor-liquid mixture, enters into a first
separator S1, where it is separated into a saturated vapor stream
S144 having parameters as at a point 6 and saturated liquid stream
S146 having parameters as at a point 7.
[0049] The liquid stream S146 having the parameters as at the point
7 is divided into two substreams S148 and S150 having parameters as
at points 70 and 72, respectively. The stream S148 having the
parameters as at the point 70, then passes through an eighth heat
exchanger HE8, where it is heated and partially vaporized in an
eighth heat exchange process, in counterflow to an external heat
carrier stream S152 having initial parameters as a point 638 and
final parameters as at a pint 639, forming a stream S154 having
parameters as at a point 74. Thereafter, stream S154 having the
parameters as at the point 74 passes through a fifth throttle valve
TV5, where its pressure is reduced to a pressure equal to a
pressure of the stream S100 having the parameters as at the point
138, forming the stream S102 having the parameters as at the point
71. Thereafter, the stream S102 having the parameters as at the
point 71 is mixed with the stream S100 having the parameters as at
the point 138, forming the stream S104 having the parameters as at
the point 38 as previously described.
[0050] The stream S150 having parameters as at point 72, then
passes through a first throttle valve TV1, where its pressure is
reduced, forming a stream S156 having parameters as at a point 73.
The pressure of the stream S156 having the parameters as at the
point 73 is equal to a pressure of the streams S106, S108, and S110
having the parameters as at the points 15, 8 and 16. Thereafter the
stream S156 having the parameters as at the point 73 is mixed with
a stream S158 having parameters as at a point 45, forming the
stream S108 having the parameters as at the point 8. The stream
S108 having the parameters as a the point 8 is then mixed with the
stream S106 having the parameters as at the point 15, forming the
stream S110 having the parameters as at the point 16 as described
above.
[0051] Meanwhile, the vapor stream S144 having the parameters as at
the point 6 is sent into a bottom part of a first scrubber SC1,
which is in essence a direct contact heat and mass exchanger. At
the same time, the stream S138 having the parameters as at the
point 21 as described above, is sent into a top portion of the
first scrubber SC1. As a result of heat and mass transfer in the
first scrubber SC1, a liquid stream S160 having parameters as at a
point 35, which is in a state close to equilibrium (close means
within about 5% of the parameters of the stream S144) with the
vapor stream S144 having the parameters as at the point 6, is
produced and removed from a bottom of the first scrubber SC1. At
the same time, a vapor stream S162 having parameters as at point
30, which is in a state close to equilibrium with the liquid stream
S138 having the parameters as at the point 21, exits from a top of
the scrubber SC1.
[0052] The vapor stream S162 having the parameters as at the point
30 is then sent into a fifth heat exchanger HE5, where it is cooled
and partially condensed, in counterflow with a stream S164 of
working fluid having parameters as at a point 28 in a fifth heat
exchange process, forming a stream S166 having parameters as at a
point 25.
[0053] The liquid stream S160 having the parameters as at the point
35 is removed from the bottom of the scrubber SC1 and is sent
through a fourth throttle valve TV4, where its pressure is reduced
to a pressure equal to the pressure of the stream S156 having the
parameters as at the point 73, forming the stream S158 having the
parameters as at the point 45. The stream S158 having the
parameters as at the point 45 is then mixed with the stream S156
having the parameters as at the point 73, forming the stream S108
having the parameters as at the point 8 as described above.
[0054] The liquid stream S132 having the parameters as at the point
13, which has been preheated in the third heat exchanger HE3 as
described above, passes through a second throttle valve TV2, where
its pressure is reduced to an intermediate pressure, (i.e., a
pressure which is lower than the pressure of the stream S130 having
the parameter as at the point 14, but higher than the pressure of
the stream S122 having the parameters as at the point 1), forming a
stream S168 parameters as at a point 43, corresponding to a state
of a vapor-liquid mixture. Thereafter, the stream S168 having the
parameters as at the point 43 is sent into a third separator S3,
where it is separated into a vapor stream S170 having parameters as
at a point 34 and a liquid stream S172 having parameters as at a
point 32.
[0055] A concentration of the low boiling component in the vapor
stream S170 having the parameters as at the point 34 is
substantially higher than a concentration of the low boiling
component in the stream S100 having the parameters as at the point
138 as it enters the CTCSS 100 as described above. The liquid
stream S172 having the parameters as at the point 32 has a
concentration of low boiling component which is less than a
concentration of low boiling component in the stream S122 having
the parameters as at the point 1 as described above.
[0056] The liquid stream S126 of the basic solution having the
parameters as at the point 4 as described above, enters into a
first circulating pump P1, where it is pumped to a pressure equal
to the pressure of the stream S170 having the parameters as at the
point 34, forming a stream S174 having parameters as at a point 31
corresponding to a state of subcooled liquid. Thereafter, the
subcooled liquid stream S174 having the parameters as at the point
31 and the saturated vapor stream S170 having the parameters as at
the point 34 are combined, forming a stream S176 having parameters
as at a point 3. The stream S176 having the parameters as at the
point 3 is then sent into an intermediate pressure condenser or a
seventh heat exchanger HE7, where it is cooled and fully condensed
in a seventh heat exchange process, in counterflow with a stream
S178 of cooling water or air having initial parameters as at a
point 55 and having final parameters as at a point 56, forming a
stream S180 having parameters as at a point 23. The stream S180
having parameters as at point 23 then enters into a second
circulating pump P2, where its pressure is increased to a pressure
equal to that of the stream S166 having the parameters as at the
point 25 as described above, forming a stream S182 parameters as at
a point 40. The stream S182 having the parameters as at the point
40 is then mixed with the stream S166 having the parameters as at
the point 25 as described above, forming a stream S184 having
parameters as at a point 26. The composition and flow rate of the
stream S182 having the parameters as at the point 40 are such that
the stream S184 having the parameters as at the point 26 has the
same composition and flow rate as the stream S100 having the
parameters as at the point 138, which entered the CTCSS 100, but
has a substantially higher pressure.
[0057] Thereafter, the stream S184 having the parameters as at the
point 26 enters into a high pressure condenser or sixth heat
exchanger HE6, where it is cooled and fully condensed in a sixth
heat exchange process, in counterflow with a stream S186 of cooling
water or air having initial parameters as at a point 53 and final
parameters as at a point 54, forming a steam S188 parameters as at
a point 27, corresponding to a state of saturated liquid. The
stream S188 having the parameters as at the point 27 then enters
into a third or feed pump P3, where it is pumped to a desired high
pressure, forming the stream S164 having the parameters as at the
point 28. Then the stream S164 of working fluid having the
parameters as at the point 28 is sent through the fifth heat
exchanger HE5, where it is heated, in counterflow with the stream
S162 having the parameters as at the point 30 in the fifth heat
exchange process, forming a stream S190 having parameters as at a
point 29 as described above. The stream S190 having the parameters
as at a point 29 then exits the CTCSS 100, and returns to the power
system. This CTCSS of this invention is closed in that no material
is added to any stream in the CTCSS.
[0058] In some cases, preheating of the working fluid which is
reproduced in the CTCSS is not necessary. In such cases, the fifth
heat exchanger HE5 is excluded from the Variant 1a described above.
As a result, the stream S162 having the parameters as at the point
30 and the stream S166 having the parameters as at the point 25 are
the same, and the stream S164 having the parameters at the point 28
are the stream S190 having the parameters as at the point 29 are
the same as shown in FIG. 2. The CTCSS system in which HE5 is
excluded is referred to as Variant lb.
[0059] The CTCSSs of this invention provide highly effective
utilization of heat available from the condensing stream S100 of
the working solution having the parameters as at the point 138 and
of heat from external sources such as from the stream S152.
[0060] In distinction from an analogous system described in the
prior art, the lean liquid stream S146 having the parameters as at
the point 7 coming from the first separator S1, is not cooled in a
separate heat exchanger, but rather a portion of the stream S146 is
injected into the stream S100 of working fluid returning from the
power system.
[0061] When the stream S136 of basic solution having the parameters
as at the point 12 starts to boil, it initially requires a
substantial quantity of heat, while at the same time its rise in
temperature is relatively slow. This portion of the reboiling
process occurs in the second heat exchanger HE2. In the process of
further reboiling, the rate of increase in the temperatures becomes
much faster. This further portion of the reboiling process occurs
in the first heat exchanger HE1. At the same time, in the process
of condensation of the stream S104 having the parameters as at the
point 38, initially a relatively large quantity of heat is
released, with a relatively slow reduction of temperature. But in
further condensation, the rate of reduction of temperature is much
higher. As a result of this phenomenon, in the prior art, the
temperature differences between the condensing stream of working
solution and the reboiling stream of basic solution are minimal at
the beginning and end of the process, but are quite large in the
middle of the process.
[0062] In contrast to the prior art, in the CTCSS of this
invention, the concentration of the low boiling component in stream
S108 having the parameters as at the point 8 is relatively low and
therefore in the second heat exchanger HE2, stream S108 having the
parameters as at the point 8 not only condenses itself, but has the
ability to absorb additional vapor. As a result, the quantity of
heat released in the second heat exchanger HE2 in the second heat
exchange process is substantially larger than it would be if
streams S108 and S106 having the parameters as at the points 8 and
15, respectively, were cooled separately and not collectively
collect after combining the two stream S108 and S106 to form the
stream S110. As a result, the quantity of heat available for the
reboiling process comprising the first and second heat exchange
processes is substantially increased, which in turn increases the
efficiency of the CTCSS system.
[0063] The leaner the stream S108 having the parameters at as the
point 8 is, the greater its ability to absorb vapor, and the
greater the efficiency of the heat exchange processes occurring in
the first and second heat exchangers HE1 and HE2. But the
composition of the stream S108 having the parameters at as the
point 8 is defined by the temperature of the stream S142 having the
parameters as at the point 5; the higher the temperature of the
stream S142 having the parameters as at the point 5, the leaner the
composition of stream S108 having the parameters at as the point 8
can be.
[0064] It is for this reason that external heat derived from stream
S152 is used to heat stream S148 having the parameters as at the
point 70, thus raising the temperature of the stream S104 having
the parameters as at the point 38, and as a result also raising the
temperature of the stream S142 having the parameters as at the
point 5. However, increasing of the temperature of the stream S142
having the parameters as at the point 5, and correspondingly the
temperature of the stream S144 having the parameters as at a point
6, leads to a reduction in a concentration of the low boiling
component in the vapor stream S144 having the parameters as at the
point 6.
[0065] Use of the scrubber SC1, in place of a heat exchanger, for
the utilization of heat from the stream S144 having the parameters
as at the point 6 allows both the utilization of the heat from the
stream S144 having the parameters as at the point 6 and an increase
of the concentration of low boiling component in the produced vapor
stream S162 having the parameters as at the point 30.
[0066] The vapor stream S162 having the parameters as at the point
30 has a concentration of low-boiling component which is higher
than the concentration of the low boiling component in the vapor
stream S144 having the parameters as at the point 6, and the flow
rate of stream S162 having the parameters as at the point 30 is
higher than the flow rate of the stream S144 having the parameters
as at the point 6.
[0067] The concentration of low boiling component in the working
fluid is restored in the stream S184 having the parameters at the
point 26, by mixing the stream S166, a very rich solution, having
the parameters as at the point 25 (or the stream S162 having the
parameters as at the point 30, in the case of the Variant 1b), with
the stream S182 having the parameters as at the point 40. The
stream S182 having the parameters as at point 40 has a higher
concentration of low boiling component than the basic solution,
(i.e., is enriched). Such an enrichment has been used in the prior
art, but in the prior art, in order to obtain this enrichment, a
special intermediate pressure reboiling process is needed requiring
several additional heat exchangers.
[0068] In the CTCSSs of this invention, all heat that is available
at a temperature below the boiling point of the basic solution
(i.e., below the temperature of the stream S130 having the
parameters as at the point 14) is utilized in a single heat
exchanger, the third heat exchanger HE3. Thereafter, the vapor
needed to produce the enriched stream S182 having the parameters as
at the point 40 is obtained simply by throttling the stream S132
having the parameters as at the point 13.
[0069] In U.S. Pat. No. 5,572,871, a DCSS (CTCSS) required 13 heat
exchangers and three separators, and did not provide for the
potential utilization of external heat. In contrast, the CTCSS of
the present invention, which does provide for the utilization of
external heat, requires only eight heat exchangers, two separators
and one scrubber (which is substantially simpler and less expensive
than a heat exchanger.)
[0070] A table of example parameters of all points for variant 1b
is presented in Table 1. TABLE-US-00001 TABLE 1 CTCSS State Points
Summary (Variant 1b) Wetness X T P H S G rel (lb/lb/) or Point
(lb/lb) (.degree. F.) (psia) (Btu/lb) (Btu/lb-R) (G/G = 1) Phase T
(.degree. F.) Working Fluid 01 0.4640 65.80 30.772 -72.3586 0.0148
8.39248 Mix 1 02 0.4640 65.97 73.080 -72.0625 0.0151 8.39248 Liq
-45.53.degree. F. 03 0.6635 103.77 73.080 180.1339 0.4592 0.49176
Mix 0.6584 04 0.4640 65.97 73.080 -72.0625 0.0151 8.08657 Liq
-45.53.degree. F. 05 0.4640 191.03 100.823 234.3143 0.5229 1.83999
Mix 0.7351 06 0.9337 191.03 100.823 662.3343 1.2517 0.48733 Mix 0
07 0.2948 191.03 100.823 80.1075 0.2603 1.35266 Mix 1 08 0.2948
143.93 34.772 80.1074 0.2651 1.34681 Mix 0.93 11 0.4640 137.27
102.823 24.6957 0.1857 1.83999 Mix 0.9707 12 0.4640 133.62 104.823
2.9022 0.1490 1.83999 Mix 1 13 0.4640 133.62 104.823 2.9022 0.1490
5.99531 Mix 1 14 0.4640 133.62 104.823 2.9022 0.1490 8.08657 Mix 1
15 0.7277 143.93 34.772 463.0612 0.9967 1.23621 Mix 0.2994 16
0.5020 143.93 34.772 263.3857 0.6153 2.58302 Mix 0.6282 17 0.5020
138.62 33.772 247.8614 0.5906 2.58302 Mix 0.6417 18 0.5020 76.28
32.772 13.9449 0.1776 2.58302 Mix 0.8841 19 0.4640 80.93 32.772
-6.8178 0.1376 8.39248 Mix 0.9257 21 0.4640 131.71 100.823 2.9022
0.1490 0.25126 Mix 0.9964 22 0.4640 133.62 104.823 2.9022 0.1490
2.09125 Mix 1 23 0.6635 65.80 71.080 -56.4301 0.0224 0.49176 Mix 1
24 0.9337 191.03 100.823 662.3343 1.2517 0.48733 Mix 0 25 0.9911
131.71 100.823 600.2216 1.1578 0.50824 Mix 0 26 0.8300 87.68
100.823 277.4277 0.6017 1.00000 Mix 0.4842 27 0.8300 65.80 98.823
-17.0503 0.0497 1.00000 Mix 1 28 0.8300 70.73 1,900.000 -7.8325
0.0525 1.00000 Liq -256.82.degree. F. 29 0.8300 70.73 1,900.000
-7.8325 0.0525 1.00000 Liq -256.82.degree. F. 30 0.9911 131.71
100.823 600.2216 1.1578 0.50824 Mix 0 31 0.4640 65.97 73.080
-72.0625 0.0151 0.30591 Liq -45.53.degree. F. 32 0.4471 116.52
73.080 -16.0494 0.1167 5.80941 Mix 1 34 0.9919 116.52 73.080
595.1359 1.1849 0.18590 Mix 0 35 0.2948 191.03 100.823 80.1075
0.2603 0.23036 Mix 1 38 0.7277 196.03 35.772 775.0604 1.4862
1.23621 Vap 0.degree. F. 40 0.6635 65.96 100.823 -56.1779 0.0227
0.49176 Liq -19.53.degree. F. 41 0.4471 82.91 32.772 -16.0494
0.1196 5.80941 Mix 0.9442 43 0.4640 116.52 73.080 2.9022 0.1498
5.99531 Mix 0.969 44 0.4640 66.12 109.823 -71.8156 0.0153 8.08657
Liq -70.52.degree. F. 45 0.2948 143.93 34.772 80.1075 0.2651
0.23036 Mix 0.93 70 0.2948 191.03 100.823 80.1075 0.2603 0.23621
Mix 1 71 0.2948 227.10 35.772 615.2057 1.0815 0.23621 Mix 0.4122 72
0.2948 191.03 100.823 80.1075 0.2603 1.11645 Mix 1 73 0.2948 143.93
34.772 80.1075 0.2651 1.11645 Mix 0.93 74 0.2948 284.54 98.823
615.2060 1.0182 0.23621 Mix 0.4545 138 0.8300 358.47 35.772
812.8197 1.5611 1.00000 Vap 181.2.degree. F. External Heat Source
638 AIR 351.74 12.976 99.4176 0.5970 3.83489 Vap 666.2.degree. F.
639 AIR 216.03 12.904 66.4582 0.5529 3.83489 Vap 530.5.degree. F.
Coolant 51 water 51.80 24.693 19.9498 0.0396 27.3421 Liq
-187.56.degree. F. 52 water 71.93 14.693 40.0672 0.0783 27.3421 Liq
-140.03.degree. F. 53 water 51.80 24.693 19.9498 0.0396 13.6854 Liq
-187.56.degree. F. 54 water 73.33 14.693 41.4676 0.0809 13.6854 Liq
-138.63.degree. F. 55 water 51.80 24.693 19.9498 0.0396 3.07700 Liq
.sup. -187.56 F. 56 water 89.63 14.693 57.7573 0.1110 3.07700 Liq
-122.32.degree. F.
[0071] The CTCSSs of this invention can be simplified by
eliminating some "modular" components. For instance, it is possible
to enrich the stream S182 having the parameters as at the point 40
without using the intermediate pressure condenser, the seventh heat
exchanger HE7. Such a system, with preheating of the stream S164 of
working fluid having the parameters as at the point 28 is shown in
FIG. 3, and referred to as Variant 2a. A similar system, but
without preheating the stream S164 of working fluid having the
parameters as at the point 28, is shown in FIG. 4, and referred to
as Variant 2b.
[0072] In the Variant 2a and Variant 2b, in distinction to the
Variant 1a and Variant 1b, the pressure of the stream S168 having
the parameters as at the point 43 is chosen in such a way that the
when mixing the vapor stream S170 having the parameters as at the
point 34 and the liquid stream S174 having the parameters as at the
point 31, the subcooled liquid stream S174 having the parameters as
at the point 31 fully absorbs the vapor stream S170 having the
parameters as at the point 34, and the resulting stream S176 having
the parameters as at the point 3 is in a state of saturated, or
slightly subcooled, liquid. Thereafter, the liquid S176 having the
parameters as at the point 3 is sent into the second pump P2, to
form the stream S182 having the parameters as at the point 40, and
is mixed with stream 25.
[0073] The simplification of the CTCSS of Variant 2a and Variant 2b
reduces the overall efficiency of the CTCSSs of this invention, but
at the same time, the cost is also reduced.
[0074] Another possible modular simplification of the Variant 1a
and Variant 1b can be used in a case where external heat is not
available, or the choice is made not to utilize external heat. Such
a variant of the CTCSS of this invention, with preheating of the
stream S164 of working fluid having the parameters as at the point
28 is shown in FIG. 5, and is referred to as Variant 3a. A similar
CTCSS of this invention, but without preheating the stream S164 of
the working fluid having the parameters as at the point 28, is
shown in FIG. 6, and referred to as Variant 3b.
[0075] In Variant 3a and Variant 3b, the stream S148 having the
parameters as at the point 70 is not heated, but rather simply
passes through the fifth throttle valve TV5, to form the stream
S102 having the parameters as at the point 71, and is then mixed
with the stream S100 having the parameters as at the point 138,
forming the stream S104 having the parameters as at the point 38.
This mixing process is used only in a case where the stream S100
having the parameters as at the point 138 is in a state of
superheated vapor. The flow rate of streams S148 and S102 having
the parameters as at the points 70 and 71 is chosen in such a way
that the stream S104 having the parameters as at the point 38
formed as a result of mixing the stream S102 having the parameters
as at the point 71 and the stream S100 having the parameters as at
the point 138 is in a state of saturated, or slightly wet,
vapor.
[0076] It is also possible to simplify Variant 2a and Variant 2b in
the same manner than Variant 1a and Variant 1b are simplified to
obtain Variant 3a and Variant 3b. This modular simplification of
Variant 2a and Variant 2b, with preheating of the stream S164 of
the working fluid having the parameters as at the point 28 is shown
in FIG. 7, and is referred to as Variant 4a; while a similar
simplification of Variant 2b, without preheating the stream S164 of
the working fluid having the parameters as at the point 28, is
shown in FIG. 8, and referred to as Variant 4b.
[0077] A final modular simplification is attained by eliminating
the scrubber SC1, and the use of the stream S182 having the
parameters as at the point 40 without any enrichment, i.e., the
composition of stream S182 having the parameters as at the point 40
is the same as the composition of the basic solution. This modular
simplification of Variant 4a, with preheating of the stream S164 of
the working fluid having the parameters as at the point 28 is shown
in FIG. 9, and is referred to as Variant 5a. A similar
simplification of Variant 4b, without preheating the stream S164 of
the working fluid having the parameters as at the point 28, is
shown in FIG. 10, and referred to as Variant 5b. It must be noted
that the modular simplification of the Variant 5a and Variant 5b
results in a substantial reduction of the efficiency of the CTCSS.
Also in Variants 5a and 5b, the stream S122 having the parameters
as at the point 1 is not split into two substreams S122 and S124
which are then separately pressurized, but is pressurized in as a
single stream in a pump P5 forming a stream S192 having parameters
as at a point 46. The stream S192 is then split to form the stream
S128 having the parameters as at the point 44 and the stream S182
having the parameters as at the point 40.
[0078] The CTCSSs of this invention is described in the five basic
variants given above; (two of which utilize external heat, and
three of which utilize only the heat available from the stream S100
of the working fluid entering the CTCSSs of this invention). One
experienced in the art would be able to generate additional
combinations and variants of the proposed systems. For instance, it
is possible to simplify Variant 4a by eliminating the scrubber SC1,
while retaining the enrichment of the stream S182 having the
parameters as at the points 40. (Likewise it is possible to retain
the scrubber SC1, and eliminate only the enrichment process for the
stream S182 having the parameters as at the points 40.) However all
such modular simplifications are still based on the initial Variant
1a of the CTCSSs of this invention.
[0079] The efficacy of the CTCSS of this invention, per se, can be
assessed by its compression ratio; i.e., a ratio of the pressure of
the stream S184 having the parameters as at the point 26 (at the
entrance to the high pressure condenser, heat exchanger HE6) to the
pressure of the stream S100 having the parameters as at the point
138 (at the point of entrance of the stream of working solution
into the CTCSS). The impact of the efficacy of the CTCSS on the
efficiency of the whole system depends on the structure and
parameters of work of the whole system. For assessing the CTCSSs of
this invention, several calculations have been performed. A stream
comprising a water-ammonia mixture having a composition of 0.83
weight fraction of ammonia (i.e., 83 wt. % ammonia), with an
initial temperature of 1050.degree. F. and an initial pressure of
1800 psia, has been expanded in a turbine with an isoenthropic
efficiency of 0.875 (87.5%). The parameters of the vapor upon
exiting the turbine correspond to the stream S100 having the
parameters at the point 138. Such computations have been performed
for all proposed "b" variants of the CTCSS of this invention
described above, and for a simple condenser system as well. These
calculations are presented in Table 2. It should be noted that the
incremental enthalpy drop produced by using a CTCSS of this
invention is specific to the exact parameters of pressure and
temperature at the turbine inlet. If these parameters were to be
lowered, then the percentage of increase in enthalpy drop would be
substantially larger. TABLE-US-00002 TABLE 2 Efficacy of CTCSS
Variants 1b, 2b, 3b, 4b, and 5b Simple CTCSS CTCSS CTCSS CTCSS
CTCSS Condenser Variant 1b Variant 2b Variant 3b Variant 4b Variant
5b pressure of 100.823 35.771 38.972 42.067 45.079 59.368 turbine
outlet (point 138) (psia) compression 1.000 2.8181 2.5871 2.3967
2.2366 1.69827 ratio (P26:P138) turbine 337.3891 418.6930 412.5639
407.0011 410.8869 380.7543 enthalpy drop (btu/lb) incremental 0.000
81.3040 75.1748 69.6119 64.4978 43.3652 enthalpy drop (btu/lb)
incremental 0.000 24.098 22.281 20.633 19.117 12.853 enthalpy drop
(%)
[0080] Comparison has shown that all variants of the CTCSSs of this
invention have an efficacy that is higher or equal to comparable
subsystems in the prior art. However, all of the proposed CTCSS are
substantially simpler and less expensive than the subsystems
described in the prior art.
[0081] All references cited herein are incorporated by reference.
While this invention has been described fully and completely, it
should be understood that, within the scope of the appended claims,
the invention may be practiced otherwise than as specifically
described. Although the invention has been disclosed with reference
to its preferred embodiments, from reading this description those
of skill in the art may appreciate changes and modification that
maybe made which do not depart from the scope and spirit of the
invention as described above and claimed hereafter.
* * * * *