U.S. patent application number 12/291811 was filed with the patent office on 2009-09-10 for power generator utitlizing circulated working fluid from a pulsed electrolysis system and method of using same.
Invention is credited to Nehemia Davidson.
Application Number | 20090224545 12/291811 |
Document ID | / |
Family ID | 40751124 |
Filed Date | 2009-09-10 |
United States Patent
Application |
20090224545 |
Kind Code |
A1 |
Davidson; Nehemia |
September 10, 2009 |
Power generator utitlizing circulated working fluid from a pulsed
electrolysis system and method of using same
Abstract
A power generating system (100) and a method of operating the
same is provided, the system utilizing an electrolytic heating
subsystem (103). The electrolytic heating subsystem is a pulsed
electrolysis system that heats a working fluid contained within a
circulation conduit (107) in thermal communication with an
electrolysis tank (109) of the electrolytic heating subsystem
(103). As the working fluid is circulated through the circulation
conduit, it is heated to a temperature above its boiling point,
causing at least a portion of the working fluid to be converted to
vapor (e.g., steam). The vapor is then circulated through a steam
turbine (111), causing its rotation and, in turn, an electric
generator (113) coupled to the steam turbine.
Inventors: |
Davidson; Nehemia;
(Rosh-Haayin, IL) |
Correspondence
Address: |
PATENT LAW OFFICE OF DAVID G. BECK
P. O. BOX 1146
MILL VALLEY
CA
94942
US
|
Family ID: |
40751124 |
Appl. No.: |
12/291811 |
Filed: |
November 13, 2008 |
Current U.S.
Class: |
290/52 ; 60/645;
60/670 |
Current CPC
Class: |
F22B 1/021 20130101;
C25B 9/19 20210101; C25B 9/73 20210101; Y02E 60/36 20130101; C25B
15/00 20130101; H05B 3/60 20130101; C25B 1/04 20130101 |
Class at
Publication: |
290/52 ; 60/670;
60/645 |
International
Class: |
F01D 15/10 20060101
F01D015/10; F01K 15/00 20060101 F01K015/00; F01K 13/00 20060101
F01K013/00 |
Foreign Application Data
Date |
Code |
Application Number |
Dec 7, 2007 |
CA |
2,613,897 |
Claims
1. A power generating system comprising: an electrolytic heating
subsystem comprising: an electrolysis tank; a liquid within said
electrolysis tank, wherein said liquid includes at least one of
water, deuterated water, tritiated water, semiheavy water, heavy
oxygen water, water containing an isotope of hydrogen, and water
containing an isotope of oxygen; a membrane separating said
electrolysis tank into a first region and a second region; at least
one pair of low voltage electrodes contained within said
electrolysis tank, wherein each pair of said at least one pair of
low voltage electrodes includes an anode and a cathode; at least
one pair of high voltage electrodes contained within said
electrolysis tank, wherein each pair of said at least one pair of
high voltage electrodes includes an anode and a cathode, wherein
said anodes of said at least one pair of low voltage electrodes and
said anodes of said at least one pair of high voltage electrodes
are contained within said first region, wherein said cathodes of
said at least one pair of low voltage electrodes and said cathodes
of said at least one pair of high voltage electrodes are contained
within said second region, and wherein a first separation distance
corresponding to the distance between the electrodes of each pair
of high voltage electrodes is greater than a second separation
distance corresponding to the distance between the electrodes of
each pair of low voltage electrodes; a low voltage source with a
first output voltage electrically connected to said at least one
pair of low voltage electrodes; a high voltage source with a second
output voltage electrically connected to said at least one pair of
high voltage electrodes, wherein said second output voltage is
higher than said first output voltage; and a pulse generator
coupled to said low voltage source and to said high voltage source,
wherein said pulse generator simultaneously pulses both said low
voltage source and said high voltage source voltage at a specific
frequency and with a specific pulse duration; a circulation conduit
containing a working fluid, wherein a portion of said circulation
conduit is in thermal communication with said electrolytic heating
subsystem; a steam turbine coupled to said circulation conduit,
wherein vapor formed from said working fluid and contained within
said circulation conduit passes through said steam turbine; and an
electric generator coupled to said steam turbine.
2. The power generating system of claim 1, further comprising a
condenser coupled to said circulation conduit, wherein said vapor
passing through said steam turbine is cooled and condensed within
said condenser.
3. The power generating system of claim 1, further comprising a
separator coupled to said circulation conduit and interposed
between a first region of said portion of said circulation conduit
and a second region of said portion of said circulation
conduit.
4. The power generating system of claim 1, further comprising a
second electrolytic heating subsystem, wherein a second portion of
said circulation conduit is in thermal communication with said
second electrolytic heating subsystem.
5. The power generating system of claim 1, further comprising a
circulation pump coupled to said circulation conduit, wherein said
circulation pump circulates said working fluid through said
circulation conduit.
6. The power generating system of claim 1, further comprising a
system controller coupled to said electrolytic heating subsystem,
wherein said system controller is coupled to at least one of said
low voltage source, said high voltage source, and said pulse
generator.
7. The power generating system of claim 1, wherein each low voltage
cathode is comprised of a first material, wherein each low voltage
anode is comprised of a second material, wherein each high voltage
cathode is comprised of a third material, wherein each high voltage
anode is comprised of a fourth material, and wherein said first,
second, third and fourth materials are selected from the group
consisting of titanium, stainless steel, copper, iron, steel,
cobalt, manganese, zinc, nickel, platinum, palladium, aluminum,
lithium, magnesium, boron, carbon, graphite, carbon-graphite, and
metal hydrides and alloys of titanium, stainless steel, copper,
iron, steel, cobalt, manganese, zinc, nickel, platinum, palladium,
aluminum, lithium, magnesium, boron, carbon, graphite,
carbon-graphite, and metal hydrides.
8. The power generating system of claim 1, further comprising an
electromagnetic rate controller subsystem, said electromagnetic
rate controller subsystem comprising: at least one electromagnetic
coil, said at least one electromagnetic coil generating a
controllable magnetic field within a portion of said electrolysis
tank; and means for controlling magnetic field intensity of said
magnetic field, wherein said controlling means is coupled to said
at least one electromagnetic coil.
9. The power generating system of claim 1, further comprising at
least one permanent magnet, said at least one permanent magnet
generating a magnetic field within a portion of said electrolysis
tank.
10. A power generating system comprising: an electrolytic heating
subsystem comprising: an electrolysis tank; a liquid within said
electrolysis tank, wherein said liquid includes at least one of
water, deuterated water, tritiated water, semiheavy water, heavy
oxygen water, water containing an isotope of hydrogen, and water
containing an isotope of oxygen; a membrane separating said
electrolysis tank into a first region and a second region; at least
one pair of high voltage electrodes contained within said
electrolysis tank, wherein each pair of said at least one pair of
high voltage electrodes includes an anode and a cathode, wherein
said anodes of said at least one pair of high voltage electrodes
are contained within said first region, and wherein said cathodes
of said at least one pair of high voltage electrodes are contained
within said second region; a plurality of metal members contained
within said electrolysis tank, wherein at least a first metal
member of said plurality of metal members is contained within said
first region and interposed between said anodes of said at least
one pair of high voltage electrodes and said membrane, and wherein
at least a second metal member of said plurality of metal members
is contained within said second region and interposed between said
cathodes of said at least one pair of high voltage electrodes and
said membrane; a high voltage source with an output voltage
electrically connected to said at least one pair of high voltage
electrodes; and a pulse generator coupled to said high voltage
source, wherein said pulse generator pulses said high voltage
source voltage at a specific frequency and with a specific pulse
duration; a circulation conduit containing a working fluid, wherein
a portion of said circulation conduit is in thermal communication
with said electrolytic heating subsystem; a steam turbine coupled
to said circulation conduit, wherein vapor formed from said working
fluid and contained within said circulation conduit passes through
said steam turbine; and an electric generator coupled to said steam
turbine.
11. The power generating system of claim 10, further comprising a
condenser coupled to said circulation conduit, wherein said vapor
passing through said steam turbine is cooled and condensed within
said condenser.
12. The power generating system of claim 10, further comprising a
separator coupled to said circulation conduit and interposed
between a first region of said portion of said circulation conduit
and a second region of said portion of said circulation
conduit.
13. The power generating system of claim 10, further comprising a
second electrolytic heating subsystem, wherein a second portion of
said circulation conduit is in thermal communication with said
second electrolytic heating subsystem.
14. The power generating system of claim 10, further comprising a
circulation pump coupled to said circulation conduit, wherein said
circulation pump circulates said working fluid through said
circulation conduit.
15. The power generating system of claim 10, further comprising a
system controller coupled to said electrolytic heating subsystem,
wherein said system controller is coupled to at least one of said
high voltage source and said pulse generator.
16. The power generating system of claim 10, wherein each high
voltage cathode is comprised of a first material, wherein each high
voltage anode is comprised of a second material, wherein each metal
member of said plurality of metal members is comprised of a third
material, and wherein said first, second and third materials are
selected from the group consisting of titanium, stainless steel,
copper, iron, steel, cobalt, manganese, zinc, nickel, platinum,
palladium, aluminum, lithium, magnesium, boron, carbon, graphite,
carbon-graphite, and metal hydrides and alloys of titanium,
stainless steel, copper, iron, steel, cobalt, manganese, zinc,
nickel, platinum, palladium, aluminum, lithium, magnesium, boron,
carbon, graphite, carbon-graphite, and metal hydrides.
17. The power generating system of claim 10, further comprising an
electromagnetic rate controller subsystem, said electromagnetic
rate controller subsystem comprising: at least one electromagnetic
coil, said at least one electromagnetic coil generating a
controllable magnetic field within a portion of said electrolysis
tank; and means for controlling magnetic field intensity of said
magnetic field, wherein said controlling means is coupled to said
at least one electromagnetic coil.
18. The power generating system of claim 10, further comprising at
least one permanent magnet, said at least one permanent magnet
generating a magnetic field within a portion of said electrolysis
tank.
19. A method of generating electricity, the method comprising the
steps of: performing electrolysis within an electrolysis tank of an
electrolytic heating subsystem; heating a working fluid contained
within a circulation conduit using said electrolytic heating
subsystem, wherein said heating step further comprises the step of
generating vapor as said working fluid is heated above the boiling
point of the working fluid, and wherein at least a portion of said
circulation conduit is in thermal communication with said
electrolysis tank of said electrolytic heating subsystem;
circulating said vapor through a steam turbine, wherein said vapor
circulating step causes rotation of said steam turbine; and
rotating a drive shaft of a generator, wherein said drive shaft is
coupled to said steam turbine, and wherein said drive shaft
rotating step causes said generator to generate electricity.
20. The method of claim 19, wherein said electrolysis performing
step further comprises the steps of: periodically measuring a
temperature corresponding to said electrolytic heating subsystem;
comparing said measured temperature with a preset temperature; and
modifying at least one process parameter of said electrolytic
heating subsystem when said measured temperature is above or below
said preset temperature by more than a preset quantity.
21. The method of claim 19, wherein said electrolysis performing
step further comprises the steps of: periodically measuring a
temperature corresponding to said working fluid within a region of
said circulation conduit; comparing said measured temperature with
a preset temperature; and modifying at least one process parameter
of said electrolytic heating subsystem when said measured
temperature is above or below said preset temperature by more than
a preset quantity.
22. The method of claim 19, said electrolysis performing step
further comprising the steps of: applying a low voltage to at least
one pair of low voltage electrodes contained within said
electrolysis tank of said electrolytic heating subsystem, said at
least one pair of low voltage electrodes fabricated from a first
material, wherein said low voltage applying step further comprises
the step of pulsing said low voltage at a first frequency and with
a first pulse duration; applying a high voltage to at least one
pair of high voltage electrodes contained within said electrolysis
tank, said at least one pair of high voltage electrodes fabricated
from a second material, wherein said high voltage applying step
further comprises the step of pulsing said high voltage at said
first frequency and with said first pulse duration, wherein said
high voltage pulsing step is performed simultaneously with said low
voltage pulsing step, and wherein said low voltage electrodes of
said at least one pair of low voltage electrodes are positioned
between said high voltage electrodes of said at least one pair of
high voltage electrodes; and selecting said first material and said
second material from the group consisting of titanium, stainless
steel, copper, iron, steel, cobalt, manganese, zinc, nickel,
platinum, palladium, aluminum, lithium, magnesium, boron, carbon,
graphite, carbon-graphite, and metal hydrides and alloys of
titanium, stainless steel, copper, iron, steel, cobalt, manganese,
zinc, nickel, platinum, palladium, aluminum, lithium, magnesium,
boron, carbon, graphite, carbon-graphite, and metal hydrides.
23. The method of claim 22, further comprising the step of
generating a magnetic field within a portion of said electrolysis
tank, wherein said magnetic field affects a heating rate
corresponding to said heat transfer medium heating step.
24. The method of claim 19, said electrolysis performing step
further comprising the steps of applying a high voltage to at least
one pair of high voltage electrodes contained within said
electrolysis tank, said at least one pair of high voltage
electrodes fabricated from a first material, wherein said high
voltage applying step further comprises the step of pulsing said
high voltage at a first frequency and with a first pulse duration,
wherein each pair of said at least one pair of high voltage
electrodes includes at least one high voltage cathode electrode and
at least one high voltage anode electrode, wherein each high
voltage cathode electrode is positioned within a first region of
said electrolysis tank and each high voltage anode electrode is
positioned within a second region of said electrolysis tank,
wherein at least a first metal member of a plurality of metal
members fabricated from a second material is located within said
first region of said electrolysis tank between said high voltage
cathode electrodes and a membrane located within said electrolysis
tank, and wherein at least a second metal member of said plurality
of metal members is located within said second region of said
electrolysis tank between said high voltage anode electrodes and
said membrane, and further comprising the step of selecting said
first material and said second material from the group consisting
of titanium, stainless steel, copper, iron, steel, cobalt,
manganese, zinc, nickel, platinum, palladium, aluminum, lithium,
magnesium, boron, carbon, graphite, carbon-graphite, and metal
hydrides and alloys of titanium, stainless steel, copper, iron,
steel, cobalt, manganese, zinc, nickel, platinum, palladium,
aluminum, lithium, magnesium, boron, carbon, graphite,
carbon-graphite, and metal hydrides.
25. The method of claim 24, further comprising the step of
generating a magnetic field within a portion of said electrolysis
tank, wherein said magnetic field affects a heating rate
corresponding to said heat transfer medium heating step.
Description
CROSS-REFERENCE TO RELATED APPLICATION
[0001] Under 35 U.S.C. 119, the present application claims the
benefit of the earlier filing date and the right of priority to
Canadian Patent Application Serial No. 2,613,897, filed Dec. 7,
2007, the disclosure of which is hereby incorporated by reference
for any and all purposes.
FIELD OF THE INVENTION
[0002] The present invention relates generally to electric power
generating systems.
BACKGROUND OF THE INVENTION
[0003] Power generating systems in general, and steam power plants
in particular, are well known in the art. This type of power
generating system uses any of a variety of heat sources to heat
water in order to produce steam. The steam flows into one or more
turbines which spin a generator in order to produce electricity.
Common heat sources used to heat the water within the boiler are
coal, lignite (brown coal), fuel oil, natural gas, oil shale and
nuclear reactors. In general, these systems are scalable although
the extent of scalability is driven in large part by the fuel. For
example, it is easier to scale a coal-fired boiler than it is to
scale a boiler utilizing nuclear energy. As the temperature,
pressure and quantity of steam is varied, other aspects of the
system are typically scaled as well. For example, the need for
pre-heaters and super-heaters depends, in part, on the size of the
system. Additionally, turbine complexity varies with power plant
size, ranging from small power generation systems utilizing only a
single turbine to large power generation systems utilizing a series
of interconnected turbines that include high pressure, intermediate
pressure and low pressure turbines.
[0004] Although steam-electric power plants are well known, the
current systems exhibit one or more problems. First, as previously
noted, the extent of scalability varies, thus making certain power
plants unusable or overly inefficient for certain applications
(e.g., using a nuclear steam-electric power plant to provide power
to a small community). Second, all current steam-electric power
plants generate considerable environmental waste. For example, all
fossil fuel based systems generate carbon dioxide, a major
contributor to global warming. Fission-based nuclear reactors,
while not generating carbon dioxide, produce large quantities of
radioactive waste, typically on the order of 20 to 30 tons per
year, which can remain toxic for hundreds of thousands of years. In
addition to the problems of radioactive waste containment, removal
and storage, this form of waste also adds a high degree of risk to
the operation of such a power plant, both to local residents and
those living hundreds of miles away. For example, the accident that
occurred at Chernobyl in the Ukraine increased the radiation levels
in Scotland to over 10,000 times the norm. Additionally, some
nuclear reactor waste can be used to produce nuclear weapons (i.e.,
bombs), thus adding the cost of security to the operating costs of
the power plant.
[0005] In addition to the environmental and safety issues
associated with current steam-electric power plants, these systems
can also lead to increased vulnerability to potential supply
disruption, whether the supply is a fossil fuel such as coal or a
nuclear fuel such as uranium. Additionally, obtaining such fuels,
for example by mining, can have significant adverse effects on the
ecosystem in the area in which the fuel is mined and processed.
[0006] Accordingly, what is needed is a steam-electric power plant
that is scalable and environmentally friendly. The present
invention provides such a system.
SUMMARY OF THE INVENTION
[0007] The present invention provides a power generating system and
a method of operating the same, the system utilizing an
electrolytic heating subsystem. The electrolytic heating subsystem
is a pulsed electrolysis system that heats a working fluid
contained within a circulation conduit in thermal communication
with an electrolysis tank of the electrolytic heating subsystem. As
the working fluid is circulated through the circulation conduit, it
is heated to a temperature above its boiling point, causing at
least a portion of the working fluid to be converted to vapor
(e.g., steam). The vapor is then circulated through a steam
turbine, causing its rotation and, in turn, an electric generator
coupled to the steam turbine.
[0008] In one embodiment of the invention, the power generating
system includes an electrolytic heating subsystem comprised of an
electrolysis tank, a membrane separating the electrolysis tank into
two regions, at least one pair of low voltage electrodes, at least
one pair of high voltage electrodes, a low voltage source, a high
voltage source, and means for simultaneously pulsing both the low
voltage source and the high voltage source. The system is further
comprised of a circulation conduit containing a working fluid, at
least a portion of the circulation conduit being in thermal
communication with the electrolytic heating subsystem, for example
by surrounding a portion of the electrolysis tank or being
integrated within the electrolysis tank or being integrated within
the walls of the electrolysis tank. Upon heating, the working fluid
within the circulation conduit is converted to vapor (e.g., steam).
The vapor is circulated through a steam turbine that is coupled to
a generator. The system can also include a condenser for condensing
the vapor after it passes through the steam turbine. The system can
also include a circulation pump. The circulation conduit can be
comprised of stages which are serially coupled to the electrolytic
heating subsystem or to multiple electrolytic heating subsystems.
The system can also include a separator. The system can also
include one or more of a variety of sensors (e.g., electrolysis
medium temperature monitor(s), working fluid temperature
monitor(s), electrolysis medium level sensors, electrolysis medium
pH sensors, electrolysis medium resistivity sensors, etc.). The
system can also include a system controller that can be coupled to
the electrolytic heating subsystem (e.g., the low and/or high
voltage sources, the pulsing means, etc.), and/or a circulation
pump, and/or the system sensors. The system can further be
comprised of at least one electromagnetic coil capable of
generating a magnetic field within a portion of the electrolysis
tank. The system can further be comprised of at least one permanent
magnet capable of generating a magnetic field within a portion of
the electrolysis tank.
[0009] In one embodiment of the invention, the power generating
system includes an electrolytic heating subsystem comprised of an
electrolysis tank, a membrane separating the electrolysis tank into
two regions, at least one pair of high voltage electrodes, a
plurality of metal members contained within the electrolysis tank
and interposed between the high voltage electrodes and the
membrane, a high voltage source, and means for pulsing the high
voltage source. The system is further comprised of a circulation
conduit containing a working fluid, at least a portion of the
circulation conduit being in thermal communication with the
electrolytic heating subsystem, for example by surrounding a
portion of the electrolysis tank or being integrated within the
electrolysis tank or being integrated within the walls of the
electrolysis tank. Upon heating, the working fluid within the
circulation conduit is converted to vapor (e.g., steam). The vapor
is circulated through a steam turbine that is coupled to a
generator. The system can also include a condenser for condensing
the vapor after it passes through the steam turbine. The system can
also include a circulation pump. The circulation conduit can be
comprised of stages which are serially coupled to the electrolytic
heating subsystem or to multiple electrolytic heating subsystems.
The system can also include a separator. The system can also
include one or more of a variety of sensors (e.g., electrolysis
medium temperature monitor(s), working fluid temperature
monitor(s), electrolysis medium level sensors, electrolysis medium
pH sensors, electrolysis medium resistivity sensors, etc.). The
system can also include a system controller that can be coupled to
the electrolytic heating subsystem (e.g., the voltage source, the
pulsing means, etc.), and/or a circulation pump(s), and/or the
system sensors. The system can further be comprised of at least one
electromagnetic coil capable of generating a magnetic field within
a portion of the electrolysis tank. The system can further be
comprised of at least one permanent magnet capable of generating a
magnetic field within a portion of the electrolysis tank.
[0010] In another aspect of the invention, a method of generating
electricity is provided, the method comprising the steps of
performing electrolysis within an electrolysis tank of an
electrolytic heating subsystem, heating a working fluid contained
within a circulation conduit using the electrolytic heating system,
wherein a portion of the circulation conduit is in thermal contact
with the electrolysis tank and wherein the working fluid is heated
to a temperature above its boiling point thereby generating vapor,
circulating the generated vapor through a steam turbine thereby
causing the rotation of the steam turbine, and rotating a drive
shaft of a generator coupled to the steam turbine thereby causing
the generator to generate electricity. In at least one embodiment,
the method further comprises the step of passing the vapor through
a condenser after it has passed through the steam turbine. In at
least one embodiment, the method further comprises the steps of
heating the working fluid within a first region of the circulation
conduit, separating vapor formed within the first region, and
heating the separated vapor within a second region of the
circulation conduit, wherein the second region of the circulation
conduit may be thermally coupled to the same electrolytic heating
subsystem or to a different electrolytic heating subsystem. In at
least one embodiment, the method further comprises the steps of
periodically measuring the temperature of the electrolytic heating
subsystem, comparing the measured temperature with a preset
temperature or temperature range, and modifying at least one
process parameter of the electrolytic heating subsystem if the
measured temperature is outside (lower or higher) of the preset
temperature or temperature range. In at least one embodiment, the
method further comprises the steps of periodically measuring the
temperature of the working fluid, comparing the measured
temperature with a preset temperature or temperature range, and
modifying at least one process parameter of the electrolytic
heating subsystem if the measured temperature is outside (lower or
higher) of the preset temperature or temperature range. In at least
one embodiment, the step of performing electrolysis further
comprises the steps of applying a low voltage to at least one pair
of low voltage electrodes contained within the electrolysis tank of
the electrolytic heating subsystem and applying a high voltage to
at least one pair of high voltage electrodes contained within the
electrolysis tank, wherein the low voltage and the high voltage are
simultaneously pulsed. In at least one embodiment, the step of
performing electrolysis further comprises the steps of applying a
high voltage to at least one pair of high voltage electrodes
contained within the electrolysis tank, the high voltage applying
step further comprising the step of pulsing said high voltage,
wherein at least one metal member is positioned between the high
voltage anode(s) and the tank membrane and at least one other metal
member is positioned between the high voltage cathode(s) and the
tank membrane. In at least one embodiment, the method further
comprises the step of generating a magnetic field within a portion
of the electrolysis tank, wherein the magnetic field affects a
heating rate corresponding to the electrolytic heating
subsystem.
[0011] A further understanding of the nature and advantages of the
present invention may be realized by reference to the remaining
portions of the specification and the drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0012] FIG. 1 is an illustration of an exemplary embodiment of the
invention;
[0013] FIG. 2 is an illustration of an alternate exemplary
embodiment with multiple heating stages and a single electrolytic
heating subsystem;
[0014] FIG. 3 is an illustration of an alternate exemplary
embodiment with multiple heating stages and multiple electrolytic
heating subsystems;
[0015] FIG. 4 is a detailed view of an embodiment of the
electrolytic heating subsystem;
[0016] FIG. 5 is a detailed view of an alternate embodiment of the
electrolytic heating subsystem shown in FIG. 4;
[0017] FIG. 6 is a detailed view of an alternate embodiment of the
electrolytic heating subsystem shown in FIG. 4 utilizing an
electromagnetic rate controller;
[0018] FIG. 7 is a detailed view of an alternate embodiment of the
electrolytic heating subsystem shown in FIG. 5 utilizing an
electromagnetic rate controller as shown in FIG. 6;
[0019] FIG. 8 is a detailed view of an alternate embodiment of the
electrolytic heating subsystem shown in FIG. 6 utilizing a
permanent magnet rate controller;
[0020] FIG. 9 is a detailed view of an alternate embodiment of the
electrolytic heating subsystem shown in FIG. 7 utilizing a
permanent magnet rate controller; and
[0021] FIG. 10 illustrates a mode of operation in which the
electrolytic heating subsystem is periodically optimized.
DESCRIPTION OF THE SPECIFIC EMBODIMENTS
[0022] FIG. 1 is an illustration of an exemplary system 100 in
accordance with the invention. System 100 is comprised of two
primary subsystems; electric power generation subsystem 101 and
pulsed electrolytic heating subsystem 103. The system can be scaled
to allow optimization for different power output requirements.
[0023] During operation, electrolytic heating subsystem 103 becomes
very hot, the temperature dependent on the operating conditions of
subsystem 103 (e.g., on/off cycling time, electrode size, input
power, input frequency and pulse duration, etc.). Typically
subsystem 103, and more specifically fluid 105 within subsystem
103, is maintained during operation at a relatively high
temperature, typically on the order of at least
150.degree.-250.degree. C., more preferably on the order of
250.degree.-350.degree. C., and still more preferably on the order
of 350.degree.-500.degree. C. It some embodiments, the system is
maintained at even higher temperatures.
[0024] Coupling pulsed electrolytic heating subsystem 103 to
electric power generation subsystem 101 is a conduit 107. It will
be appreciated that although conduit 107 is referred to herein as a
single conduit, in practice it can be comprised of multiple
conduits coupled together, the individual conduits being of either
a similar or dissimilar construction. A portion of conduit 107 is
contained within electrolysis tank 109, or mounted around
electrolysis tank 109, or integrated within the walls of
electrolysis tank 109. The primary considerations for the location
of conduit 107 relative to tank 109 are (i) the efficiency of the
thermal communication between the electrolytic heating subsystem
and the conduit (and the working fluid contained therein) and (ii)
minimization of conduit erosion. As most materials used for the
electrolysis tank are poor thermal conductors, typically conduit
107 is either contained within the tank or integrated within the
tank walls. Preferably tank 109 and conduit 107 are all designed to
operate at high pressures, thus allowing the desired temperatures
to be reached while maintaining electrolysis fluid 105 in a fluid
state.
[0025] During electrolysis, the heat generated by the process heats
electrolysis fluid 105 which, in turn, heats conduit 107 and the
working fluid contained within conduit 107. Preferably the working
fluid within conduit 107 is water although other materials such as
an organic fluid can also be used. The working fluid is heated to a
temperature above its boiling point, thereby creating vapor (e.g.,
steam). The vapor is circulated through a turbine 111, turbine 111
being either a single-stage or a multi-stage turbine. Although
turbine 119 can be coupled to a variety of devices, thereby
utilizing the rotary motion of the turbine to perform mechanical
work, preferably turbine 111 is coupled to an electric generator
113, for example via direct linkage between the shaft of the
turbine and the drive shaft of the generator.
[0026] After the working fluid passes through turbine 111 it is
cooled and condensed within a condenser 115. Preferably the working
fluid is continually cycled through the steam process via
circulation pump 117. Pump 117 can be a single speed or a
multi-speed pump and, in at least one embodiment, is used in
conjunction with a control valve 119. Control valve 119 can be a
variable flow valve or other type of valve. Pump 117, alone or in
combination with valve 119, controls the flow of working fluid
through conduit 107.
[0027] In a preferred embodiment of the invention, a system
controller 121 controls the performance of the system by varying
one or more operating parameters (i.e., process parameters) of
electrolytic heating subsystem 103 to which it is attached via
power supply 123. Varying operating parameters of power supply 123
and thus subsystem 103, for example cycling the subsystem on and
off or varying other operational parameters as described further
below, allows the subsystem to be operated at the desired
temperature. Preferably at least one temperature monitor 125,
coupled to subsystem 103, allows controller 121 to obtain feedback
from the system as the operational parameters are varied.
Preferably in addition to monitoring the temperature of subsystem
103, the temperature is monitored throughout system 100 thus
allowing system operation to be monitored and optimized. For
example, preferably the temperature of the working fluid within
conduit 107 is measured and monitored by system controller 121 both
as it exits and then re-enters electrolytic heating subsystem 103,
for example using a pair of temperature monitors 127 and 129,
respectively. Additionally, in at least one preferred embodiment,
the circulation pump (e.g., pump 117) and the control valve (e.g.,
flow valve 119) are also coupled to, and controlled by, controller
121. It will be appreciated that the system may also utilize other
system monitors thus allowing complete system performance to be
monitored and optimized. Exemplary parameters that can be monitored
to provide system performance information include turbine rotation
speed, steam temperature and pressure, generator output, etc.
[0028] It is often desirable to heat the working fluid in stages,
this approach typically allowing improved optimization. In at least
one preferred embodiment, the working fluid undergoes two heating
stages; vaporization and superheating. After conclusion of the
vaporization stage, only the vapor is removed and sent on to the
superheating stage during which additional heat can be added to the
saturated vapor.
[0029] FIGS. 2 and 3 schematically illustrate the application of
the present invention to a two stage heating system using two
different configurations. It will be appreciated that other
configurations and/or different numbers of heating stages can also
be used with the invention. In the embodiment shown in FIG. 2, a
single electrolytic heating subsystem 201 is used, although it
provides two stages of heating, i.e., first heating stage 203 and
second heating stage 205. As shown, the working fluid first passes
through heating stage 203 where it is heated to a temperature above
its boiling point, thereby forming vapor. As the vapor remains in
contact with the surface of the working fluid, the vapor is
saturated and therefore unable to be superheated. Accordingly in at
least one preferred embodiment, the saturated vapor is separated by
separator 207 and then further heated within heating stage 205.
[0030] Multi-stage heating systems can also be used with multiple
electrolytic heating subsystems as shown in the exemplary
embodiment of FIG. 3. In system 300, the first stage of heating is
performed by electrolytic heating subsystem 301 while the second,
preferably super-heating, stage of heating is performed by
electrolytic heating subsystem 303. It will be appreciated that, if
desired, multiple heating stages can be performed within one or
more of the multiple electrolytic heating subsystems, thus
combining features illustrated in FIGS. 2 and 3. One advantage of
using multiple electrolytic heating subsystems is that each of them
can be optimized for the desired temperature for that stage of
heating. Preferably temperature monitors are included in each of
the electrolytic heating subsystems, for example monitors 305 and
307 which monitor the temperature of the electrolysis fluid, and
within the working fluid conduit as the conduit enters and exits
each of the electrolytic heating subsystems (e.g., monitors
309-312).
[0031] Particulars of the electrolytic heating subsystem will now
be provided. It will be appreciated that the following
configurations can be used for systems utilizing a single
electrolytic heating subsystem as shown in FIGS. 1 and 2, or for
systems utilizing multiple electrolytic heating subsystems as shown
in FIG. 3.
[0032] FIG. 4 is an illustration of a preferred embodiment of an
electrolytic heating subsystem 400. Note that in FIGS. 4-9 only a
portion of conduit 107 is shown, thus allowing a better view of the
underlying electrolytic subsystem. Additionally, for illustration
clarity, the portions of conduit 107 that are included are shown
mounted to the exterior surface of the electrolysis tank even
though as previously noted, conduit 107 is typically integrated
within the tank walls or mounted within the tank, thereby improving
on the transfer of heat from the electrolytic subsystem to the
working fluid contained within the conduit.
[0033] Tank 109 is comprised of a non-conductive material and, as
with conduit 107 and all fittings and couplings associated with the
tank or with the conduit, are designed to accommodate the
operational pressures of the system. The size of tank 109 is
primarily selected on the basis of the desired system output, i.e.,
the desired operating temperature and the expected heat load.
Although tank 109 is shown as having a rectangular shape, it will
be appreciated that the invention is not so limited and that tank
109 can utilize other shapes, for example cylindrical, square,
irregularly-shaped, etc. Tank 109 is substantially filled with
medium 105. In at least one preferred embodiment, liquid 105 is
comprised of water, or more preferably water with an electrolyte,
the electrolyte being an acid electrolyte, a base electrolyte, or a
combination of an acid electrolyte and a base electrolyte.
Exemplary electrolytes include potassium hydroxide and sodium
hydroxide. The term "water" as used herein refers to water
(H.sub.2O), deuterated water (deuterium oxide or D.sub.2O),
tritiated water (tritium oxide or T.sub.2O), semiheavy water (HDO),
heavy oxygen water (H.sub.2.sup.18O or H.sub.2.sup.17O) or any
other water containing an isotope of either hydrogen or oxygen,
either singly or in any combination thereof (for example, a
combination of H.sub.2O and D.sub.2O).
[0034] A typical electrolysis system used to decompose water into
hydrogen and oxygen gases utilizes relatively high concentrations
of electrolyte. Subsystem 103, however, has been found to work best
with relatively low electrolyte concentrations, thereby maintaining
a relatively high initial water resistivity. Preferably the water
resistivity prior to the addition of an electrolyte is on the order
of 1 to 28 megohms. Preferably the concentration of electrolyte is
in the range of 0.05 percent to 10 percent by weight, more
preferably the concentration of electrolyte is in the range of 0.05
percent to 2.0 percent by weight, and still more preferably the
concentration of electrolyte is in the range of 0.1 percent to 0.5
percent by weight.
[0035] Separating tank 109 into two regions is a membrane 401.
Membrane 401 permits ion/electron exchange between the two regions
of tank 109. Assuming medium 105 is water, as preferred, small
amounts of hydrogen and oxygen are produced during operation.
Accordingly membrane 401 also keeps the oxygen and hydrogen bubbles
produced during electrolysis separate, thus minimizing the risk of
inadvertent recombination of the two gases. Exemplary materials for
membrane 401 include, but are not limited to, polypropylene,
tetrafluoroethylene, asbestos, etc. Preferably tank 109 also
includes a pair of gas outlets 403 and 405, corresponding to the
two regions of tank 109. The volume of gases produced by the
process can either be released, through outlets 403 and 405, into
the atmosphere in a controlled manner or they can be collected and
used for other purposes.
[0036] As previously noted, since the electrolytic heating
subsystem is designed to reach relatively high temperatures, the
materials comprising tank 109, membrane 401 and other subsystem
components are selected on the basis of their ability to withstand
the expected temperatures and pressures. As previously noted, the
subsystem is intended to operate at relatively high temperatures,
typically at least 150.degree.-250.degree. C., more preferably on
the order of 250.degree.-350.degree. C., and still more preferably
on the order of 350.degree.-500.degree. C. Accordingly, it will be
understood that the choice of materials for the subsystem
components and the design of the subsystem (e.g., tank wall
thicknesses, fittings, etc.) will vary, depending upon the intended
subsystem operational parameters, primarily temperature and
pressure.
[0037] Replenishment of medium 105 can be through one or more
dedicated lines. FIG. 4 shows a portion of two such conduits,
conduit 407 and 409, one coupled to each of the regions of tank
401. Alternately, a replenishment conduit can be coupled to only
one region of tank 401. Although medium replenishment can be
performed manually, preferably replenishment is performed
automatically, for example using system controller 121 and flow
valve 411 within line 407 and valve 413 within line 409.
Replenishment can be performed periodically or continually at a
very low flow rate. If periodic replenishment is used, it can
either be based on the period of system operation, for example
replenishing the system with a predetermined volume of medium after
a preset number of hours of operation, or based on the volume of
medium within tank 109, the volume being provided to controller 121
using a level monitor 415 within the tank or other means. In at
least one preferred embodiment system controller 121 is also
coupled to a monitor 417, monitor 417 providing either the pH or
the resistivity of liquid 105 within the electrolysis tank, thereby
providing means for determining when additional electrolyte needs
to be added. In at least one embodiment and as previously noted,
preferably system controller 121 is also coupled to a temperature
monitor 131, monitor 131 providing the temperature of the
electrolysis medium.
[0038] In at least one embodiment of the electrolytic heating
subsystem, two types of electrodes are used, each type of electrode
being comprised of one or more electrode pairs with each electrode
pair including at least one cathode (i.e., a cathode coupled
electrode) and at least one anode (i.e., an anode coupled
electrode). All cathodes, regardless of the type, are kept in one
region of tank 109 while all anodes, regardless of the type, are
kept in the other tank region, the two tank regions separated by
membrane 401. In the embodiment illustrated in FIG. 4, each type of
electrode includes a single pair of electrodes.
[0039] The first type of electrodes, electrodes 419/421, are
coupled to a low voltage source 423. The second type of electrodes,
electrodes 425/427, are coupled to a high voltage source 429. In
the illustrations and as used herein, voltage source 423 is labeled
as a `low` voltage source not because of the absolute voltage
produced by the source, but because the output of voltage source
423 is maintained at a lower output voltage than the output of
voltage source 429. Preferably and as shown, the individual
electrodes of each pair of electrodes are parallel to one another;
i.e., the face of electrode 419 is parallel to the face of
electrode 421 and the face of electrode 425 is parallel to the face
of electrode 427. It should be appreciated, however, that such an
electrode orientation is not required.
[0040] In one preferred embodiment, electrodes 419/421 and
electrodes 425/427 are comprised of titanium. In another preferred
embodiment, electrodes 419/421 and electrodes 425/427 are comprised
of stainless steel. It should be appreciated, however, that other
materials can be used and that the same material does not have to
be used for both the low and high voltage electrodes. Additionally,
the same material does not have to be used for both the anode(s)
and the cathode(s) of the low voltage electrodes, nor does the same
material have to be used for both the anode(s) and the cathode(s)
of the high voltage electrodes. In addition to titanium and
stainless steel, other exemplary materials that can be used for the
low voltage and high voltage electrodes include, but are not
limited to, copper, iron, steel, cobalt, manganese, zinc, nickel,
platinum, palladium, aluminum, lithium, magnesium, boron, carbon,
graphite, carbon-graphite, metal hydrides and alloys of these
materials. Preferably the surface area of the faces of the low
voltage electrodes (e.g., electrode 419 and electrode 421) cover a
large percentage of the cross-sectional area of tank 109, typically
on the order of at least 40 percent of the cross-sectional area of
tank 109, and more typically between approximately 70 percent and
90 percent of the cross-sectional area of tank 109. Preferably the
separation between the low voltage electrodes (e.g., electrodes 419
and 421) is between 0.1 millimeters and 15 centimeters. In at least
one embodiment the separation between the low voltage electrodes is
between 0.1 millimeters and 1 millimeter. In at least one other
embodiment the separation between the low voltage electrodes is
between 1 millimeter and 5 millimeters. In at least one other
embodiment the separation between the low voltage electrodes is
between 5 millimeters and 2 centimeters. In at least one other
embodiment the separation between the low voltage electrodes is
between 5 centimeters and 8 centimeters. In at least one other
embodiment the separation between the low voltage electrodes is
between 10 centimeters and 12 centimeters.
[0041] In the illustrated embodiment, electrodes 425/427 are
positioned outside of the planes containing electrodes 419/421. In
other words, the separation distance between electrodes 425 and 427
is greater than the separation distance between electrodes 419 and
421 and both low voltage electrodes are positioned between the
planes containing the high voltage electrodes. The high voltage
electrodes may be larger, smaller or the same size as the low
voltage electrodes.
[0042] As previously noted, the voltage applied to the high voltage
electrodes is greater than that applied to the low voltage
electrodes. Preferably the ratio of the high voltage to the low
voltage applied to the high voltage and low voltage electrodes,
respectively, is at least 5:1, more preferably the ratio is between
5:1 and 100:1, still more preferably the ratio is between 5:1 and
33:1, and even still more preferably the ratio is between 5:1 and
20:1. Preferably the high voltage generated by source 429 is within
the range of 50 volts to 50 kilovolts, more preferably within the
range of 100 volts to 5 kilovolts, and still more preferably within
the range of 500 volts to 2.5 kilovolts. Preferably the low voltage
generated by source 423 is within the range of 3 volts to 1500
volts, more preferably within the range of 12 volts to 750 volts,
still more preferably within the range of 24 volts to 500 volts,
and yet still more preferably within the range of 48 volts to 250
volts.
[0043] Rather than continually apply voltage to the electrodes,
sources 423 and 429 are pulsed, preferably at a frequency of
between 50 Hz and 1 MHz, more preferably at a frequency of between
100 Hz and 10 kHz, and still more preferably at a frequency of
between 150 Hz and 7 kHz. The pulse width (i.e., pulse duration) is
preferably between 0.01 and 75 percent of the time period defined
by the frequency, and more preferably between 0.1 and 50 percent of
the time period defined by the frequency, and still more preferably
between 0.1 and 25 percent of the time period defined by the
frequency. Thus, for example, for a frequency of 150 Hz, the pulse
duration is preferably in the range of 0.67 microseconds to 5
milliseconds, more preferably in the range of 6.67 microseconds to
3.3 milliseconds, and still more preferably in the range of 6.67
microseconds to 1.7 milliseconds. Alternately, for example, for a
frequency of 1 kHz, the pulse duration is preferably in the range
of 0.1 microseconds to 0.75 milliseconds, more preferably in the
range of 1 microsecond to 0.5 milliseconds, and still more
preferably in the range of 1 microsecond to 0.25 milliseconds.
Additionally, the voltage pulses are applied simultaneously to the
high voltage and low voltage electrodes via sources 423 and 429,
respectively. In other words, the voltage pulses applied to high
voltage electrodes 425/427 coincide with the pulses applied to low
voltage electrodes 419/421. Although voltage sources 423 and 429
can include internal means for pulsing the respective outputs from
each source, preferably an external pulse generator 431 controls a
pair of switches, i.e., low voltage switch 433 and high voltage
switch 435 which, in turn, control the output of voltage sources
423 and 429 as shown, and as described above.
[0044] In at least one preferred embodiment, the frequency and/or
pulse duration and/or low voltage and/or high voltage can be
changed by system controller 121 during system operation, thus
allowing the operation of the electrolytic heating subsystem to be
controlled. For example, in the configuration shown in FIG. 4, low
voltage power supply 423, high voltage power supply 429 and pulse
generator 431 are all connected to system controller 121, thus
allowing controller 121 to control the amount of heat generated by
the electrolytic heating subsystem. It will be appreciated that
both power supplies and the pulse generator do not have to be
connected to system controller 121 to provide heat generation
control. For example, only one of the power supplies and/or the
pulse generator can be connected to controller 121.
[0045] As will be appreciated by those of skill in the art, there
are numerous minor variations of the electrolytic heating subsystem
described above and shown in FIG. 4 that can be used with the
invention. For example, and as previously noted, alternate
configurations can utilize tanks of different size and/or shape,
different electrolytic solutions, and a variety of different
electrode configurations and materials. Exemplary alternate
electrode configurations include, but are not limited to, multiple
low voltage cathodes, multiple low voltage anodes, multiple high
voltage cathodes, multiple high voltage anodes, multiple low
voltage electrode pairs combined with multiple high voltage
electrode pairs, electrodes of varying size or shape (e.g.,
cylindrical, curved, etc.), and electrode pairs of varying
orientation (e.g., non-parallel faces, pairs in which individual
electrodes are not positioned directly across from one another,
etc.). Additionally, alternate configurations can utilize a variety
of input powers, pulse frequencies and pulse durations as
previously noted.
[0046] In an exemplary embodiment of the electrolytic heating
subsystem, a cylindrical chamber measuring 125 centimeters long
with an inside diameter of 44 centimeters and an outside diameter
of 50 centimeters was used. The tank contained 175 liters of water,
the water including a potassium hydroxide (KOH) electrolyte at a
concentration of 0.1% by weight. The low voltage electrodes were 75
centimeters by 30 centimeters by 0.5 centimeters and had a
separation distance of approximately 10 centimeters. The high
voltage electrodes were 3 centimeters by 2.5 centimeters by 0.5
centimeters and had a separation distance of approximately 32
centimeters. Both sets of electrodes were comprised of titanium.
The pulse frequency was maintained at 150 Hz and the pulse duration
was initially set to 260 microseconds and gradually lowered to 180
microseconds during the course of a 4 hour run. The low voltage
supply was set to 50 volts, drawing a current of between 5.5 and
7.65 amps, and the high voltage supply was set to 910 volts,
drawing a current of between 2.15 and 2.48 amps. The initial
temperature was 28.degree. C. and monitored continuously with a
pair of thermocouples, one in each side of the tank. After
conclusion of the 4 hour run, the temperature of the tank fluid had
increased to 67.degree. C.
[0047] Illustrating the correlation between electrode size and heat
production efficiency, the high voltage electrodes of the previous
test were replaced with larger electrodes, the larger electrodes
measuring 9.5 centimeters by 5 centimeters by 0.5 centimeters, thus
providing approximately 6.3 times the surface area of the previous
high voltage electrodes. The larger electrodes, still operating at
a voltage of 910 volts, drew a current of between 1.73 and 1.9
amps. The low voltage supply was again set at 50 volts, in this run
the low voltage electrodes drawing between 0.6 and 1.25 amps.
Although the pulse frequency was still maintained at 150 Hz, the
pulse duration was lowered from an initial setting of 60
microseconds to 15 microseconds. All other operating parameters
were the same as in the previous test. In this test, during the
course of a 5 hour run, the temperature of the tank fluid increased
from 28.degree. C. to 69.degree. C. Given the shorter pulses and
the lower current, this test with the larger high voltage
electrodes exhibited a heat production efficiency approximately 8
times that exhibited in the previous test.
[0048] FIG. 5 is an illustration of a second exemplary embodiment
of the electrolytic heating subsystem, this embodiment using a
single type of electrodes. Subsystem 500 is basically the same as
subsystem 400 shown in FIG. 4 with the exception that low voltage
electrodes 419/421 have been replaced with a pair of metal members
501/503; metal member 501 interposed between high voltage electrode
425 and membrane 401 and metal member 503 interposed between high
voltage electrode 427 and membrane 401. The materials comprising
metal members 501/503 are the same as those of the low voltage
electrodes. Preferably the surface area of the faces of members 501
and 503 is a large percentage of the cross-sectional area of tank
109, typically on the order of at least 40 percent, and often
between approximately 70 percent and 90 percent of the
cross-sectional area of tank 109. Preferably the separation between
members 501 and 503 is between 0.1 millimeters and 15 centimeters.
In at least one embodiment the separation between the metal members
is between 0.1 millimeters and 1 millimeter. In at least one other
embodiment the separation between the metal members is between 1
millimeter and 5 millimeters. In at least one other embodiment the
separation between the metal members is between 5 millimeters and 2
centimeters. In at least one other embodiment the separation
between the metal members is between 5 centimeters and 8
centimeters. In at least one other embodiment the separation
between the metal members is between 10 centimeters and 12
centimeters. The preferred ranges for the size of the high voltage
electrodes as well as the high voltage power, pulse frequency and
pulse duration are the same as in the exemplary subsystem shown in
FIG. 4 and described above.
[0049] In a test of the exemplary embodiment of the electrolytic
heating subsystem using metal members in place of low voltage
electrodes, the same cylindrical chamber and electrolyte-containing
water was used as in the previous test. The metal members were 75
centimeters by 30 centimeters by 0.5 centimeters and had a
separation distance of approximately 10 centimeters. The high
voltage electrodes were 3 centimeters by 2.5 centimeters by 0.5
centimeters and had a separation distance of approximately 32
centimeters. The high voltage electrodes and the metal members were
fabricated from stainless steel. The pulse frequency was maintained
at 150 Hz and the pulse duration was initially set to 250
microseconds and gradually lowered to 200 microseconds during the
course of a 2 hour run. The high voltage supply was set to 910
volts, drawing a current of between 2.21 and 2.45 amps. The initial
temperature was 30.degree. C. and monitored continuously with a
pair of thermocouples, one in each side of the tank. After
conclusion of the 2 hour run, the temperature of the tank fluid had
increased to 60.degree. C.
[0050] As with the previously described set of tests, the
correlation between electrode size and heat production efficiency
was demonstrated by replacing the high voltage electrodes with
larger electrodes measuring 9.5 centimeters by 5 centimeters by 0.5
centimeters. The larger electrodes, still operating at a voltage of
910 volts, drew a current of between 1.6 and 1.94 amps. The pulse
frequency was still maintained at 150 Hz, however, the pulse
duration was lowered from an initial setting of 90 microseconds to
25 microseconds. All other operating parameters were the same as in
the previous test. In this test during the course of a 6 hour run,
the temperature of the tank fluid increased from 23.degree. C. to
68.degree. C., providing an increase in heat production efficiency
of approximately 3 times over that exhibited in the previous
test.
[0051] As with the previous exemplary embodiment, it will be
appreciated that there are numerous minor variations of the
electrolytic heating subsystem described above and shown in FIG. 5
that can be used with the invention. For example, and as previously
noted, alternate configurations can utilize tanks of different size
and/or shape, different electrolytic solutions, and a variety of
different electrode/metal member configurations and materials.
[0052] Exemplary alternate electrode/metal member configurations
include, but are not limited to, multiple sets of metal members,
multiple high voltage cathodes, multiple high voltage anodes,
multiple sets of metal members combined with multiple high voltage
cathodes and anodes, electrodes/metal members of varying size or
shape (e.g., cylindrical, curved, etc.), and electrodes/metal
members of varying orientation (e.g., non-parallel faces, pairs in
which individual electrodes are not positioned directly across from
one another, etc.). Additionally, alternate configurations can
utilize a variety of input powers, pulse frequencies and pulse
durations.
[0053] In at least one preferred embodiment of the invention, the
electrolytic heating subsystem uses a reaction rate controller to
help achieve optimal performance of the heating subsystem(s). The
rate controller operates by generating a magnetic field within the
electrolysis tank, either within the region between the high
voltage cathode(s) and the low voltage cathode(s) or metal
member(s), or within the region between the high voltage anode(s)
and the low voltage anode(s) or metal member(s), or both regions.
The magnetic field can either be generated with an electromagnetic
coil or coils, or with one or more permanent magnets. The benefit
of using electromagnetic coils is that the intensity of the
magnetic field generated by the coil or coils can be varied by
controlling the current supplied to the coil(s), thus providing a
convenient method of controlling the reaction rate.
[0054] FIG. 6 provides an exemplary embodiment of an electrolytic
heating subsystem 600 that includes an electromagnetic rate
controller. It should be understood that the electromagnetic rate
controller shown in FIGS. 6 and 7, or the rate controller using
permanent magnets shown in FIGS. 8 and 9, is not limited to a
specific tank/electrode configuration. For example, electrolysis
tank 601 of system 600 is cylindrically-shaped although the tank
could utilize other shapes such as the rectangular shape of tank
109. As in the previous embodiments, the electrolytic heating
subsystem includes a membrane (e.g., membrane 603) separating the
tank into two regions, a pair of gas outlets (e.g., outlets
605/607), medium replenishment conduits 609 and 611 (one per region
in the exemplary embodiment illustrated in FIG. 6), flow control
valves (e.g., valves 613 and 615) coupled to the system controller,
and working fluid conduits 107. As in the embodiments shown in
FIGS. 4 and 5, only a portion of the conduits are shown, thus
providing a better view of the underlying system. Preferably the
system also includes a water level monitor (e.g., monitor 619), a
pH or resistivity monitor (e.g., monitor 621), and a temperature
monitor 623. This embodiment, similar to the one shown in FIG. 4,
utilizes both low voltage and high voltage electrodes.
Specifically, subsystem 600 includes a pair of low voltage
electrodes 625/627 and a pair of high voltage electrodes
629/631.
[0055] In the electrolytic heating subsystem illustrated in FIG. 6,
a magnetic field of controllable intensity is generated between the
low voltage and high voltage electrodes within each region of tank
601. Although a single electromagnetic coil can generate fields
within both tank regions, in the illustrated embodiment the desired
magnetic fields are generated by a pair of electromagnetic coils
633/635. As shown, electromagnetic coil 633 generates a magnetic
field between the planes containing low voltage electrode 625 and
high voltage electrode 629 and electromagnetic coil 635 generates a
magnetic field between the planes containing low voltage electrode
627 and high voltage electrode 631. Electromagnetic coils 633/635
are coupled to a controller 637 which is used to vary the current
through coils 633/635, thus allowing the strength of the magnetic
field generated by the electromagnetic coils to be varied as
desired. As a result, the rate of the reaction driven by the
electrolysis system, and thus the amount of heat generated by the
subsystem, can be controlled. In particular, increasing the
magnetic field generated by coils 633/635 decreases the reaction
rate. Accordingly, a maximum reaction rate is achieved with no
magnetic field while the minimum reaction rate is achieved by
imposing the maximum magnetic field. It will be appreciated that
the exact relationship between the magnetic field and the reaction
rate depends on a variety of factors including reaction strength,
electrode composition and configuration, voltage/pulse
frequency/pulse duration applied to the electrodes, electrolyte
concentration, and achievable magnetic field, the last parameter
dependent primarily upon the composition of the coils, the number
of coil turns, and the current available from controller 637.
[0056] Although the subsystem embodiment shown in FIG. 6 utilizes
coils that are interposed between the low voltage electrode and the
high voltage electrode planes, it will be appreciated that the
critical parameter is to configure the system such that there is a
magnetic field, preferably of controllable intensity, between the
low voltage and high voltage electrode planes. Thus, for example,
if the coils extend beyond either, or both, the plane containing
the low voltage electrode(s) and the plane controlling the high
voltage electrode(s), the system will still work as the field
generated by the coils includes the regions between the low voltage
and high voltage electrodes. Additionally it will be appreciated
that although the embodiment shown in FIG. 6 utilizes a single
controller 637 coupled to both coils, the system can also utilize
separate controllers for each coil (not shown). Similarly, while
the illustrated subsystem utilizes dual coils, the invention can
also use a single coil to generate a single field which affects
both tank regions, or primarily affects a single tank region.
Additionally it will be appreciated that the electromagnetic coils
do not have to be mounted to the exterior surface of the tank as
shown in FIG. 6. For example, the electromagnetic coils can be
integrated within the walls of the tank, or mounted within the
tank. By mounting the electromagnetic coils within, or outside, of
the tank walls, coil deterioration from electrolytic erosion is
minimized.
[0057] The magnetic field rate controller is not limited to use
with electrolytic heating subsystems employing both low and high
voltage electrodes. For example, the electromagnetic rate
controller subsystem can be used with embodiments using high
voltage electrodes and metal members as described above and shown
in the exemplary embodiment of FIG. 5. FIG. 7 is an illustration of
an exemplary embodiment based on the embodiment shown in FIG. 6,
replacing low voltage electrodes 625/627 with metal members
701/703, respectively. As with the electromagnetic rate controller
used with the dual voltage system, it will be appreciated that
configurations using high voltage electrodes and metal members can
utilize internal electromagnetic coils, electromagnetic coils
mounted within the tank walls, and electromagnetic coils mounted
outside of the tank walls. Additionally, and as previously noted,
the electromagnetic rate controller is not limited to a specific
tank and/or electrode configuration.
[0058] As previously noted, although electromagnetic coils provide
a convenient means for controlling the intensity of the magnetic
field applied to the reactor, permanent magnets can also be used
with the electrolytic heating subsystem of the invention, for
example when the magnetic field does not need to be variable. FIGS.
8 and 9 illustrate embodiments based on the configurations shown in
FIGS. 6 and 7, but replacing coils 633 and 635 with permanent
magnets 801 and 803, respectively. Note that in the view of FIG. 8,
only a portion of electrode 625 is visible while none of electrode
631 is visible. Similarly in the view of FIG. 9, only a portion of
metal member 701 is visible while none of electrode 631 is
visible.
[0059] In at least one mode of operation, the system controller is
configured to adjust the operating parameters of the electrolytic
heating subsystem during operation, for example based on the
temperature of the electrolysis medium or the temperature of the
working fluid. This type of control can be used, for example, to
insure that the temperature of the electrolytic heating subsystem
remains within a preset range, even if the system output varies
with age. Typically this type of process modification occurs
periodically; for example the system can be configured to execute a
system performance self-check every 30 minutes or at some other
time interval.
[0060] FIG. 10 illustrates a preferred method of modifying the
output of the electrolytic heating subsystem. As shown, during
system operation (step 1001) the system controller periodically
performs a self-check (step 1003). The first step of the self-check
process is to determine the temperature of the selected region of
the system (step 1005). As previously noted, typically the system
is configured to perform the self-check process on the basis of the
monitored temperature of the electrolysis fluid, although the
temperature of the working fluid or some other system component can
also be used. The measured temperature is then compared to a preset
temperature or temperature range (step 1007). If the temperature is
acceptable (step 1009), for example within the preset temperature
range, the system simply goes back to standard operation until the
system determines that it is time for another system check. If the
measured temperature is unacceptable (step 1011), for example if it
falls outside of the preset range, the electrolysis process is
modified (step 1013). During the electrolysis process modification
step, i.e., step 1013, one or more process parameters are varied.
Exemplary process parameters include pulse duration, pulse
frequency, system power cycling, electrode voltage, and, if the
system includes an electromagnetic rate control system, the
intensity of the magnetic field. Preferably during the electrolysis
modification step, the system controller modifies the process in
accordance with a series of pre-programmed changes, for example
altering the pulse duration in 10 microsecond steps until the
desired temperature is reached. Since varying the electrolysis
process does not have an immediate affect on the monitored
temperature, preferably after making a system change, a period of
time is allowed to pass (step 1015) before determining if further
process modification is required, thus allowing the system to reach
equilibrium, or close to equilibrium. During the process, the
system controller continues to monitor the temperature of the
selected region/material (step 1017) and compare that temperature
to the preset temperature/temperature range in order to determine
if further modification is required (step 1019). Once the
temperature reaches an acceptable level (step 1021), the system
goes back to standard operation.
[0061] As will be understood by those familiar with the art, the
present invention may be embodied in other specific forms without
departing from the spirit or essential characteristics thereof.
Accordingly, the disclosures and descriptions herein are intended
to be illustrative, but not limiting, of the scope of the invention
which is set forth in the following claims.
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