U.S. patent application number 14/008714 was filed with the patent office on 2014-04-24 for membrane dust-pumping system.
The applicant listed for this patent is Frank Hannemann, Thomas Metz, Sebastian Rahm, Gunter Tietze. Invention is credited to Frank Hannemann, Thomas Metz, Sebastian Rahm, Gunter Tietze.
Application Number | 20140112802 14/008714 |
Document ID | / |
Family ID | 45974313 |
Filed Date | 2014-04-24 |
United States Patent
Application |
20140112802 |
Kind Code |
A1 |
Hannemann; Frank ; et
al. |
April 24, 2014 |
MEMBRANE DUST-PUMPING SYSTEM
Abstract
A diaphragm pump is provided for the pressurized delivery of
dusts in a dust feeding device. The diaphragm pump includes a
storage hopper which is subjected to inert gas at ambient pressure
and which serves for the storage of the dust. A sluicing vessel is
provided which is connected via an inlet in the upper region, via a
shut-off fitting and via a dust supply line to the dust store of
the storage hopper, and is connected via an outlet in the lower
region and via a shut-off fitting to a high-pressure device. A
diaphragm is mounted in the sluicing vessel. An expansion line is
provided, one end of which is connected via a filter element to the
sluicing vessel and into which a shut-off fitting is incorporated.
The diaphragm pump includes charging line which is connected via a
filter element and via a shut-off fitting to the sluicing
vessel.
Inventors: |
Hannemann; Frank; (Freiberg,
DE) ; Metz; Thomas; (Freiberg, DE) ; Rahm;
Sebastian; (Freiberg, DE) ; Tietze; Gunter;
(Landsberg am Lech, DE) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Hannemann; Frank
Metz; Thomas
Rahm; Sebastian
Tietze; Gunter |
Freiberg
Freiberg
Freiberg
Landsberg am Lech |
|
DE
DE
DE
DE |
|
|
Family ID: |
45974313 |
Appl. No.: |
14/008714 |
Filed: |
April 5, 2012 |
PCT Filed: |
April 5, 2012 |
PCT NO: |
PCT/EP2012/056302 |
371 Date: |
December 4, 2013 |
Current U.S.
Class: |
417/53 ;
417/474 |
Current CPC
Class: |
F04B 43/02 20130101;
F04B 15/023 20130101; F04B 43/06 20130101; F04B 43/026
20130101 |
Class at
Publication: |
417/53 ;
417/474 |
International
Class: |
F04B 43/02 20060101
F04B043/02 |
Foreign Application Data
Date |
Code |
Application Number |
Apr 8, 2011 |
DE |
102011007066.4 |
Claims
1-29. (canceled)
30. A diaphragm pump for the pressurized delivery of dusts in a
dust feeding device, the diaphragm pump comprising: a storage
hopper which is subjected to inert gas at ambient pressure and
which serves for the storage of the dust, a sluicing vessel whose
volume is separated in a gas-tight and liquid-tight manner by a
diaphragm into a dust region and an impingement medium region,
wherein the dust region of the sluicing vessel is connected via an
inlet in the upper region, via a shut-off fitting and via a dust
supply line to the dust store of the storage hopper, and is
connected via an outlet in the lower region and via a shut-off
fitting to a high-pressure device, wherein the impingement medium
region is connected to a supply and discharge line for an
impingement medium, an expansion line, one end of which is
connected via a filter element to the sluicing vessel and into
which a shut-off fitting is incorporated, a charging line which is
connected via a filter element and via a shut-off fitting to the
sluicing vessel, wherein the shut-off fitting in the dust supply
line is configured to be opened for such a length of time that the
dust chamber of the sluicing vessel is filled with dust, wherein
the inert gas displaced out of said sluicing vessel in the process
can be discharged via the expansion line and the open shut-off
fitting, wherein after the closure of the shut-off fitting in the
dust supply line and of the shut-off fitting in the expansion line,
the dust chamber can be charged with high-pressure inert gas to the
pressure of the high-pressure device via the charging line and via
the open shut-off fitting , wherein after the operating pressure of
the high-pressure device is reached, the pressurized dust passes,
by gravity-driven delivery action, into the high-pressure device
via the open shut-off fitting at the inlet of the high-pressure
device, wherein after the transfer of the dust out of the sluicing
vessel into the high-pressure device, the diaphragm can be moved
into the position of maximum displacement, and subsequently the
shut-off fitting to the high-pressure device can be closed.
31. The diaphragm pump as claimed in claim 30, wherein the other
end of the expansion line is connected to the storage hopper.
32. The diaphragm pump as claimed in claim 30, wherein in that the
diaphragm is in the form of a pot-shaped diaphragm.
33. The diaphragm pump as claimed in claim 30, wherein the
diaphragm is in the form of a plate-shaped diaphragm.
34. The diaphragm pump as claimed claim 30, wherein the diaphragm
is in the form of a hose-shaped diaphragm.
35. The diaphragm pump as claimed in claim 30, wherein the
diaphragm is in the form of a piston with rolling diaphragm.
36. The diaphragm pump as claimed in claim 30, wherein the
diaphragm is substantially circular.
37. The diaphragm pump as claimed in claim 30, wherein the filter
element is adapted in terms of its shape to the volume omitted by
the deflection of the diaphragm.
38. The diaphragm pump as claimed in claim 30, wherein the filter
element is of large-area form.
39. The diaphragm pump as claimed in claim 30, wherein the filter
element substantially has an annular shape.
40. The diaphragm pump as claimed in claim 30, wherein the
impingement medium is in the form of a hydraulic liquid.
41. The diaphragm pump as claimed in claim 30, wherein the
impingement medium is in the form of a gas.
42. The diaphragm pump as claimed in claim 30, wherein the charging
line is connected to the high-pressure inert gas supply.
43. The diaphragm pump as claimed in claim 30, wherein the charging
line is connected to the high-pressure device.
44. The diaphragm pump as claimed in claim 30, wherein multiple
feeding devices are arranged for delivering dust into the
high-pressure device.
45. A method for the pressurized delivery of dusts in a dust
feeding device, wherein the dust feeding device includes: a storage
hopper which is subjected to inert gas at ambient pressure and
which serves for the storage of the dust, a sluicing vessel which
is connected via an inlet in the upper region, via a shut-off
fitting and via a dust supply line to the dust store of the storage
hopper, and is connected via an outlet in the lower region and via
a shut-off fitting to a high-pressure device, a diaphragm mounted
in the sluicing vessel, an expansion line, one end of which is
connected via a filter element to the sluicing vessel and into
which a shut-off fitting is incorporated, a charging line which is
connected via a filter element and via a shut-off fitting to the
sluicing vessel, the method comprising: opening the shut-off
fitting in the dust supply line for such a length of time that the
dust chamber of the sluicing vessel is filled with dust,
discharging the inert gas to be displaced out of said sluicing
vessel in the process via the expansion line and the open shut-off
fitting, after the closure of the shut-off fitting in the dust
supply line and of the shut-off fitting in the expansion line,
charging the dust chamber with high-pressure inert gas to the
pressure of the high-pressure device via the charging line and via
the open shut-off fitting, after the operating pressure of the
high-pressure device is reached, passing the pressurized dust by
gravity-driven delivery action into the high-pressure device via
the open shut-off fitting at the inlet of the high-pressure device,
after the transfer of the dust out of the sluicing vessel into the
high-pressure device, moving the diaphragm into the position of
maximum displacement, and subsequently closing the shut-off fitting
to the high-pressure device.
46. The method as claimed in claim 45, wherein the dust is
delivered by gravity-driven delivery action into the sluicing
vessel arranged below the storage hopper.
47. The method as claimed in claim 45, wherein the gravity-driven
delivery of the dust out of the storage hopper into the sluicing
vessel arranged below is assisted by an opening movement of the
diaphragm.
48. The method as claimed in claim 45, wherein the dust is
delivered by gravity-driven delivery action into the high-pressure
device arranged below the sluicing vessel.
49. The method as claimed in claim 45, wherein the gravity-driven
delivery of the dust out of the sluicing vessel into the
high-pressure device arranged below is assisted by a displacement
movement of the diaphragm.
50. The method as claimed in claim 45, wherein the ratio between
the displacement volume of the diaphragm and the dead volume in the
sluicing vessel is selected such that, after the refraction
movement of the diaphragm, the remaining gas quantity is present at
approximately ambient pressure.
51. The method as claimed in claim 45, wherein the gas quantity
remaining in the sluicing vessel is expanded to ambient pressure
via the filter elements and via the open shut-off fitting in the
expansion line.
52. The method as claimed in claim 45, wherein the process is
continued cyclically.
53. The method as claimed in claim 45, wherein the diaphragm is
deflected hydraulically.
54. The method as claimed in claim 45, wherein the pressurized dust
passes together with the charging gas into the high-pressure device
and is subsequently supplied to a dust consumer.
55. The method as claimed in claim 45, wherein the pressurized dust
passes together with the charging gas into the high-pressure
device, which is in the form of an injector, and is supplied to a
consumer by injection of delivery gas.
56. The method as claimed in claim 45, wherein multiple feeding
devices are provided which operate in a phase-offset manner on a
common high-pressure device.
57. The method as claimed in claim 45, wherein in each case two
feeding devices operate in tandem such that the charging of one
sluicing vessel in one feeding device is performed at the same time
as the displacement movement of the diaphragm in the other feeding
device.
58. The method as claimed in claim 45, wherein the pressure
difference between the storage hopper and the high-pressure device
is overcome by multiple feeding devices arranged one below the
other.
Description
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This application is the US National Stage of International
Application No. PCT/EP2012/056302, filed Apr. 5, 2012 and claims
the benefit thereof. The International Application claims the
benefits of German application No. 102011007066.4 DE filed
September Apr. 8, 2011. All of the applications are incorporated by
reference herein in their entirety.
FIELD OF INVENTION
[0002] The invention relates to a diaphragm pump for the pneumatic
pressurized delivery of dusts, and to a method for the pressurized
delivery of dusts in a dust feeding device.
BACKGROUND OF INVENTION
[0003] The subject matter of the application relates to a
diaphragm-type dust pump system which is capable of feeding dusts
from a vessel operated at ambient pressure into a system that
operates at elevated operating pressure.
[0004] In many technical processes, it is necessary for dusts to be
delivered pneumatically at an elevated pressure level. Examples
include carbon dust gasification with a pneumatic dust supply at
gasification pressures up to 4 MPa (40 bar) and above, pneumatic
combustion dust injection into tuyeres of shaft furnaces such as
blast furnaces for generating raw iron, or else the pneumatic
delivery of dusts over large distances, wherein the delivery
receptacles must be charged to the operating pressure required for
overcoming the delivery line pressure loss.
[0005] In the prior art, in particular in the case of applications
with relatively high operating pressures, such as are necessary in
the case of carbon dust pressurized gasification, use is made of a
system of feeding sluices, as described in
"NOELL-KONVERSIONSVERFAHREN ZUR VERWERTUNG UND ENTSORGUNG VON
ABFALLEN" [NOELL CONVERSION METHODS FOR THE UTILIZATION AND
DISPOSAL OF WASTES"], EF-Verlag fur Energie- and Umwelttechnik
GmbH, 1996, page 34. Here, the combustion dust is supplied, from a
storage hopper at ambient pressure, to feeding sluices which are
subsequently charged to the operating pressure of the dosing or
delivery receptacle arranged therebelow by the supply of a
condensate-free inert gas. When there is a demand for dust in the
dosing or delivery receptacle, the combustion dust which is now at
the required pressure is transferred by gravity-delivery action
from the feeding sluices into the dosing or delivery
receptacle.
[0006] In the lower part of the dosing or delivery receptacle, a
partial fluidized bed is generated by the supply of a likewise
inert fluidizing gas, into which partial fluidized bed one or more
dust delivery lines are immersed. Through the application of a
pressure difference between the dosing receptacle and the receiver
of the combustion dust, for example a gasification reactor, the
combustion dust flows to said receiver as a dust gas suspension
with a high solids content. This delivery and dosing technology is
characterized by numerous disadvantages. These relate firstly to
the discontinuous operation of the feeding sluices. The feeding
sluices, after being filled with dust in the unpressurized state,
are charged to the required operating pressure by the supply of an
inert gas, are evacuated into the dosing or delivery receptacle at
said pressure, and are re-filled with dust after being expanded to
ambient pressure. In the case of high dosing rates, multiple
feeding sluices are required for a more or less continuous supply
of dust to the dosing receptacle. Further disadvantages are the
high gas requirement for the charging of the feeding sluices, and
the outlay for the cleaning of the expansion gas.
[0007] DE 103 53 968 A1 has already proposed a delivery device and
a delivery method for the delivery, with little or no fluidizing
compressed air, of coating powders, wherein the pressure increase
of a self-priming pump is effected by the exertion of hydraulic
load on a hose-type diaphragm.
[0008] CH 466 134 A discloses a method and a device for the
pneumatic delivery of material in dust and granular form, wherein
the pressurization of the material to be delivered takes place in a
diaphragm pump by the action of force on the diaphragm. A
gas-permeable diaphragm for the injection of purging gas may be
arranged in the pump chamber. The stroke chamber of the diaphragm
is configured such that only minimal gas passage gaps are provided,
so as not to increase in size the dead volume and thus reduce the
attainable pressure. Said diaphragm pump is characterized by
delivery with low gas flow rates in relation to known methods.
SUMMARY OF INVENTION
[0009] The invention is based on the problem of improving a dust
feeding system such that the sluices and the problems resulting
from the sluice expansion can be eliminated and the inert gas
requirement for the feeding of dust into a pressurized system is
significantly reduced.
[0010] The problem can be solved as in DE 10 2008 009 679 A1. Here,
use is made of pistons as displacement bodies. This however has the
disadvantage that intense wear of the piston and of the piston seal
is to be expected in the case of high pressure differences and fine
dust. Furthermore, intense wear of the shut-off fitting at the
inlet of the high-pressure device is to be expected owing to the
backward charging of the pipe line section from the dust-filled
high-pressure device. It is also to be assumed that compaction of
the dust is possible as a result of possible abrupt charging of the
dust chamber from one side.
[0011] The problem is solved by the features of the independent
claim(s).
[0012] The invention yields a considerable reduction in the
requirement for charging gas.
[0013] In a further refinement of the diaphragm pump according to
the invention, the other end of the expansion line (10) is
connected to the storage hopper (14). Said measure makes it
possible for the dust in the storage hopper to be charged with
inert charging gas with little outlay.
[0014] In a further refinement of the diaphragm pump according to
the invention, the dust is delivered by gravity-driven delivery
action into the sluicing vessel (1) arranged below the storage
hopper. Said measure makes it possible for the sluicing vessel (1)
to be filled with dust with little outlay.
[0015] In further refinement of the diaphragm pump according to the
invention, the filter element is adapted in terms of its shape to
the volume omitted by the deflection of the diaphragm. Said measure
results in a reduced minimum volume of the dust region.
[0016] In a further refinement of the diaphragm pump according to
the invention, the filter elements (5) are of large-area form. As a
result of the associated introduction of the charging gas at a low
flow speed, the dust is prevented from being compacted in the
sluicing vessel (1).
[0017] In a further refinement of the diaphragm pump according to
the invention, the charging line (12) is connected to the
high-pressure device (8). In this way, an excess of gas in the
high-pressure device (8) is avoided.
[0018] In a further refinement, the pressure difference between the
storage hopper and the high-pressure device is overcome by multiple
feeding devices arranged one below the other. Said measure results
in a splitting-up of the pressure difference between the storage
hopper and high-pressure device, an increase in the pressure
difference that can be overcome, and an increase in pressure
safety.
[0019] In a further refinement, the dust is delivered from the
storage hopper into the high-pressure device by means of multiple
feeding devices arranged in parallel. By means of said measure, an
increased dust delivery rate is attained.
[0020] In a further refinement, the feeding devices operate in a
phase-offset manner. By means of said measure, the delivery process
is homogenized.
[0021] The discontinuous sluicing process corresponding to the
prior art is replaced by a virtually continuously operating dust
feeding system.
[0022] In a further refinement, in each case two feeding devices
operate in tandem such that the charging of one sluicing vessel (1)
is performed at the same time as the volume displacement of the
other sluicing vessel by the diaphragm (2). By means of said
measure, the effects on the pressure regime of the high-pressure
device are reduced.
[0023] Through the selection of a suitable size ratio between the
sluicing vessel (1) and the high-pressure device (8), the volume
displacement in the sluicing vessel takes place without the
pressure regime of the high-pressure device (8) being significantly
influenced.
[0024] Further advantageous refinements of the invention are
specified in the subclaims.
BRIEF DESCRIPTION OF THE DRAWINGS
[0025] The invention will be explained in more detail below as an
exemplary embodiment, to an extent necessary for comprehension, on
the basis of a figure, in which:
[0026] FIG. 1 shows a dust feeding system for a system for carbon
dust delivery into a high-pressure device.
DETAILED DESCRIPTION OF INVENTION
[0027] The dust for feeding into a high-pressure device (8) which
operates at elevated operating pressure is situated within a
storage hopper (14) arranged above the dust feeding system. A
sluicing vessel (1) above the high-pressure device is filled with
dust by gravity-delivery action. Here, the delivery of the dust may
be assisted by the retraction of the diaphragm (2), which may be
manufactured from elastic material and/or may be flexible. The gas
hereby displaced from the sluicing vessel is discharged via the
open shut-off fitting (11) in the expansion line (10).
Subsequently, the shut-off fitting (7) in the carbon dust supply
line and the shut-off fitting (11) in the expansion line are
closed. Subsequently, the sluicing vessel (1) is brought to the
required pressure by means of the introduction of high-pressure
inert gas via the shut-off valve (13), which is to be opened, in
the charging line. By means of the slow introduction of the
charging gas via the filter elements (5) which are of large-area
design, the dust is prevented from being compacted in the sluicing
vessel (1). When the pressure in the sluicing vessel (1) reaches
the pressure of the high-pressure device (8), the shut-off fitting
(13) in the charging line is closed, and the shut-off fitting (9)
at the inlet of the high-pressure device is opened. By
gravity-driven delivery action, the dust is delivered out of the
sluicing vessel (1) into the high-pressure device (8). Here, the
delivery may be assisted by the displacement movement of the
diaphragm (2). The deflection of the diaphragm is effected by means
of the introduction of hydraulic fluid via the hydraulic line (4).
The hydraulic deflection of the diaphragm (2) has the effect that
said diaphragm operates in a pressure-relieved manner. When the
dust has been completely evacuated into the high-pressure device
(1), the dust chamber volume of the sluicing vessel (1) is
minimized by virtue of the diaphragm (2) being fully deflected. By
means of said measure, the highly pressurized inert gas remaining
in the sluicing vessel (1) after the dust delivery process is
greatly minimized, and thus the consumption of high-pressure inert
gas by the dust feeding system is greatly reduced. Subsequently,
the shut-off fitting (9) at the inlet of the high-pressure device
is closed.
[0028] The inert gas remaining in the sluicing vessel is then
expanded toward the storage hopper (14) by virtue of the shut-off
fitting (11) in the expansion line being opened.
[0029] When pressure equality between the sluicing vessel (1) and
storage hopper (14) is attained, one working cycle is ended and the
following cycle can be started.
[0030] To attain high feed rates, it is possible for multiple
feeding devices to be operated in parallel for the supply to a
dosing or delivery receptacle. In FIG. 1, two such feeding devices
are illustrated by way of example.
[0031] In the lower part of the dosing or delivery receptacle (1),
a partial fluidized bed is generated by the supply of a fluidizing
gas according to prior art, from which partial fluidized bed a feed
is provided to one or more delivery lines. To maintain the required
pressure difference with respect to the respective consumer or
receiver of the material, in dust form, for delivery, the dosing or
delivery receptacle has gas supplied to it, or excess gas
discharged therefrom, in a known manner.
[0032] The invention will be explained below on the basis of two
examples. This explanation is based on FIG. 1.
EXAMPLE 1
[0033] It is the intended object for a combustion dust flow rate of
up to 8 Mg/h to be supplied, by means of a system for carbon dust
injection, to a blast furnace for the generation of raw iron. For
this purpose, it is the intention to use a dosing receptacle
equipped with two feeding devices, as illustrated in FIG. 1. Taking
into consideration a bulk density of approximately 0.6 Mg/m.sup.3,
the result is a bulk volume of approximately 13.5 m.sup.3 to be fed
per hour. If it is assumed that each of the two feeding devices
performs one stroke per minute, in the case of a diameter of the
diaphragm (2.1) of 1 m, the required volume is attained with a
stroke height (2.2) of 0.28 m.
[0034] In this example, the required operating pressure of the
dosing receptacle is of the order of magnitude of 0.5-0.6 MPa (5-6
bar).
EXAMPLE 2
[0035] This example will be explained on the basis of FIG. 1.
[0036] It is the object for gasification dust to be supplied, by
means of a pneumatically operating dust feeding system, to a
reactor for the gasification of combustion dust at an operating
pressure of for example 4 MPa (40 bar). The reactor power is 500
MW. The carbon dust flow rate to be introduced for this purpose is
approximately 75 Mg/h. In the case of a bulk density of 0.6
Mg/m.sup.3, this corresponds to a feed rate of 125 m.sup.3 of
carbon dust bulk per hour.
[0037] In the present example, in each case six feeding devices are
selected. If it is assumed that each feeding device performs one
stroke per minute, in the case of a diameter of the diaphragm (2.1)
of 1.5 m, the required volume is attained with a stroke height
(2.2) of 0.4 m.
[0038] The expression "dust" used in the description is to be
understood generally to mean bulk material, in particular dusts of
different grain size distribution, composed of inorganic or organic
materials such as carbon of different coalification degree,
biomasses or dry residual and waste materials, or else chalk and
fine sand.
[0039] The expression "inert gas" used in the description is to be
understood to mean an O2-free gas, in particular nitrogen, carbon
dioxide, natural gas or else a synthesis gas from a downstream
gasification system, and any mixtures of these.
LIST OF REFERENCE NUMERALS
[0040] 1 Sluicing vessel, pressure-resistant pump housing
[0041] 2 Diaphragm
[0042] 2.1 Diameter of the diaphragm
[0043] 2.2 Stroke height of the diaphragm
[0044] 3 Diaphragm position at maximum displacement
[0045] 4 Hydraulic supply and discharge line
[0046] 5 Filter element for charging and expansion
[0047] 6 Dust supply line from the storage hopper
[0048] 7 Shut-off fitting in the dust supply line
[0049] 8 High-pressure device
[0050] 9 Shut-off fitting at the inlet of the high-pressure
device
[0051] 10 Expansion line to storage hopper
[0052] 11 Shut-off fitting in the expansion line
[0053] 12 Charging line
[0054] 13 Shut-off fitting in the charging line
[0055] 14 Storage hopper
[0056] 15 Dust region
[0057] 16 Impingement medium region
* * * * *