CN114520355A - Fuel cell power generation system and fuel cell power generation method - Google Patents
Fuel cell power generation system and fuel cell power generation method Download PDFInfo
- Publication number
- CN114520355A CN114520355A CN202011311545.6A CN202011311545A CN114520355A CN 114520355 A CN114520355 A CN 114520355A CN 202011311545 A CN202011311545 A CN 202011311545A CN 114520355 A CN114520355 A CN 114520355A
- Authority
- CN
- China
- Prior art keywords
- gas
- anode
- fuel cell
- power generation
- tail gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 93
- 238000010248 power generation Methods 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 34
- 239000007789 gas Substances 0.000 claims abstract description 201
- 239000002737 fuel gas Substances 0.000 claims abstract description 41
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000001301 oxygen Substances 0.000 claims abstract description 19
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 19
- 238000002485 combustion reaction Methods 0.000 claims description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 30
- 238000005086 pumping Methods 0.000 claims description 28
- 238000002407 reforming Methods 0.000 claims description 12
- 238000011084 recovery Methods 0.000 claims description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 7
- 229910052799 carbon Inorganic materials 0.000 claims description 7
- 239000002918 waste heat Substances 0.000 claims description 7
- 230000001105 regulatory effect Effects 0.000 description 10
- 238000006243 chemical reaction Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000008021 deposition Effects 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/06—Combination of fuel cells with means for production of reactants or for treatment of residues
- H01M8/0662—Treatment of gaseous reactants or gaseous residues, e.g. cleaning
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04082—Arrangements for control of reactant parameters, e.g. pressure or concentration
- H01M8/04089—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants
- H01M8/04097—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants with recycling of the reactants
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04082—Arrangements for control of reactant parameters, e.g. pressure or concentration
- H01M8/04201—Reactant storage and supply, e.g. means for feeding, pipes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
- H01M8/04694—Processes for controlling fuel cells or fuel cell systems characterised by variables to be controlled
- H01M8/04746—Pressure; Flow
- H01M8/04753—Pressure; Flow of fuel cell reactants
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
- H01M8/04694—Processes for controlling fuel cells or fuel cell systems characterised by variables to be controlled
- H01M8/04746—Pressure; Flow
- H01M8/04761—Pressure; Flow of fuel cell exhausts
Abstract
The invention provides a fuel cell power generation system and a fuel cell power generation method, and belongs to the technical field of fuel cells. The fuel cell power generation method includes: supplying a fuel gas to the anode; supplying an oxygen-containing gas to the cathode; and mixing a portion of the anode tail gas with the fuel gas to obtain a mixed gas, the mixed gas being supplied to the anode. By the technical scheme provided by the invention, the gas circuit in the fuel cell power generation system is adjusted, tail gas generated by the galvanic pile can be fully recycled, and the operating efficiency of the fuel cell power generation system can be improved.
Description
Technical Field
The invention relates to the technical field of fuel cells, in particular to a fuel cell power generation system and a control method thereof.
Background
The conventional fuel cell generates anode off-gas having components such as fuel gas that is not sufficiently combusted and water vapor after reaction during operation, but the conventional fuel cell does not sufficiently recycle the anode off-gas, for example, water vapor in the anode off-gas is discharged as wastewater, which results in a low fuel utilization rate of the fuel cell, and water vapor generated by other means needs to be transported to the fuel cell in addition to fuel gas and air.
Disclosure of Invention
It is an object of an embodiment of the present invention to provide a fuel cell power generation system and a control method thereof for solving one or more of the above-described technical problems.
In order to achieve the above object, an embodiment of the present invention provides a fuel cell power generation method including: supplying a fuel gas to the anode; supplying an oxygen-containing gas to the cathode; and mixing a portion of the anode tail gas with the fuel gas to obtain a mixed gas, the mixed gas being supplied to the anode.
Optionally, the circulation ratio of the anode tail gas is 0.3 to 2.2.
Optionally, the method further includes: and exchanging heat between the other part of the anode tail gas and the mixed gas, and supplying the mixed gas after heat exchange to the anode.
Optionally, the method further includes: and burning the other part of the anode tail gas and the cathode tail gas to obtain combustion tail gas.
Optionally, the method further includes: and exchanging heat between the combustion tail gas and the oxygen-containing gas, and supplying the oxygen-containing gas after heat exchange to a cathode.
Optionally, the method further includes: obtaining steam by using the combustion tail gas; and mixing the water vapor with the anode off-gas and the fuel gas to obtain the mixed gas, the mixed gas being supplied to the anode.
Optionally, the ratio of the amount of the water vapor to the carbon flow of the fuel gas is 1-2: 1.
optionally, the method further includes: reforming the mixed gas, and supplying the reformed mixed gas to the anode.
Optionally, the operating temperature of the fuel cell is 500 ℃ to 900 ℃; the working pressure of the fuel cell is 0.05MPa to 0.25 MPa.
In another aspect, an embodiment of the present invention provides a fuel cell power generation system including: a stack comprising an anode and a cathode; the pumping device is used for mixing fuel gas and anode tail gas of the anode into mixed gas and supplying the mixed gas to the anode; and the adjusting unit is connected with the pumping device and is used for adjusting the proportion of the fuel gas and the anode tail gas in the mixed gas.
Optionally, the fuel cell power generation system further includes: and the first heat exchanger is arranged between the pumping device and the anode and used for exchanging heat of the other part of the anode tail gas and the mixed gas and supplying the mixed gas after heat exchange to the anode.
Optionally, the fuel cell power generation system further includes: and the combustor is connected with the first heat exchanger and the cathode and is used for combusting the other part of the anode tail gas and the cathode tail gas to obtain combustion tail gas.
Optionally, temperature adjusting gas is introduced into the combustor, and the temperature adjusting gas is used for adjusting the temperature of the combustion tail gas.
Optionally, the fuel cell power generation system further includes: and the second heat exchanger is arranged between the combustor and the cathode and is used for exchanging heat between the combustion tail gas and the oxygen-containing gas and supplying the oxygen-containing gas after heat exchange to the cathode.
Optionally, the fuel cell power generation system further includes: and the waste heat recovery unit is arranged between the combustor and the pumping device and is used for obtaining water vapor by utilizing the combustion tail gas and conveying the water vapor to the pumping device, and the pumping device is used for mixing the water vapor with the anode tail gas and the fuel gas to obtain the mixed gas and supplying the mixed gas to the anode.
Optionally, the fuel cell power generation system further includes: and the reforming unit is arranged between the pumping device and the anode and is used for reforming the mixed gas and supplying the reformed mixed gas to the anode.
Optionally, the pumping device is an ejector pump.
Through the technical scheme, the gas circuit in the fuel cell power generation system is adjusted, tail gas generated by the galvanic pile can be fully recycled, and the operating efficiency of the fuel cell power generation system can be improved.
Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention and not to limit the embodiments of the invention. In the drawings:
fig. 1 is a schematic structural view of a fuel cell power generation system provided by an embodiment of the invention;
fig. 2 is a schematic flow chart of a power generation method of a fuel cell according to an embodiment of the present invention.
Description of reference numerals:
1 ejector pump 2 governing valve
3 reforming unit 4 first heat exchanger
5 anode 6 cathode
7 burner 8 second heat exchanger
9 waste heat recovery unit 10 air delivery end
11 regulating valve
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating embodiments of the invention, are given by way of illustration and explanation only, not limitation.
It should be noted at the outset that the terms "first," "second," and the like in the embodiments of the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature and, where desired, the effect achieved by the feature may be substantially the same.
The operation of a conventional fuel cell is as follows: the fuel gas enters the anode of the fuel cell stack, the air enters the cathode of the fuel cell stack, after the fuel gas reacts with the air, the generated anode tail gas is discharged out of the fuel cell through the gas outlet end of the anode of the stack, and the incompletely reacted air can be discharged out of the fuel cell through the gas outlet end of the cathode of the stack.
On the basis, the gas circuit in the fuel cell power generation system is improved by the scheme provided by the embodiment of the invention, so that the operation efficiency of the fuel cell power generation system is improved.
Specifically, the fuel cell power generation system provided by the embodiment of the invention is additionally provided with the pumping device and the regulating unit which are connected with each other on the basis of the conventional structure.
The fuel cell power generation system provided by the embodiment of the invention has the following working process:
when the fuel cell power generation system is in a starting working condition, the regulating functions of the pumping device and the regulating unit are not started, fuel gas directly enters the anode of the pile through the pumping device and the regulating unit, air directly enters the cathode of the pile at the moment, and the fuel cell power generation system starts to work;
in the stable working process of the fuel cell power generation system, anode tail gas discharged from the anode of the pile contains fuel gas which is not fully reacted, and the temperature of the anode tail gas is higher.
Wherein, when mixing the fuel gas and the anode tail gas, the temperature of the fuel gas can be raised by using the anode tail gas.
Considering that if the anode off-gas is completely mixed with the fuel gas, the fuel gas component ratio in the mixed gas may be low, which affects the reaction efficiency in the stack, it may be considered that only a part of the anode off-gas is sent to the pumping device and the adjusting unit. For example, the off-gas recycle ratio can be controlled by the regulating unit to be between 0.3 and 2.2, preferably between 0.5 and 2.
The temperature of the residual tail gas is higher except for the part of the anode tail gas sent to the pumping device, so the embodiment of the invention also provides a fuel cell power generation system capable of further utilizing the residual anode tail gas.
In some alternative embodiments, an exhaust gas treatment component may also be provided in the fuel cell power generation system.
Specifically, the residual anode tail gas after heat exchange contains fuel gas for full reaction, so that a combustor communicated with the first heat exchanger can be arranged in a fuel cell power generation system, the residual anode tail gas after heat exchange can be sent to the combustor to be combusted, and the tail gas after fuel gas combustion reaction is discharged.
The combustor provided by the embodiment of the invention adopts high-temperature cathode air to support combustion, so that the low-calorific-value anode tail gas can be stably combusted.
Wherein oxygen is also required in the combustion reaction inside the burner, either from a separately supplied pipe or from the cathode off-gas discharged from the cathode.
Furthermore, the temperature of the tail gas discharged by the combustor is high, and the temperature of the air entering the cathode is also high enough to ensure the reaction efficiency in the electric pile, so that in an optional embodiment of the invention, a second heat exchanger communicated with the combustor can be arranged in the fuel cell power generation system, the tail gas discharged by the combustor exchanges heat with the oxygen-containing gas to be conveyed to the cathode, and the moderated oxygen-containing gas is supplied to the cathode. Such a structural arrangement can further improve the operating efficiency of the fuel cell power generation system.
Considering that the temperature of the tail gas directly discharged by the combustor is too high, the subsequent tail gas treatment, heat exchange operation and the like are not facilitated, so that the temperature adjustment treatment can be carried out in the combustor once, namely, the temperature of the tail gas discharged by the combustor is in a controllable temperature range. Specifically, temperature adjusting gas can be introduced into the combustor, and the temperature of the combustion tail gas is adjusted by the temperature adjusting gas.
Wherein, combustor exhaust tail gas temperature range can set for according to actual demand by oneself, and just can realize exhaust tail gas temperature regulation through adjusting the volume of the tempering gas who lets in the combustor.
Alternatively, the temperature adjusting gas may be supplied separately, or may be supplied to the burner for adjusting the temperature of the combustion exhaust gas by withdrawing a portion from the oxygen-containing gas for supply to the cathode.
For fuel cell power generation systems, the cost of water vapor in the gas entering the anode can be increased, allowing the anode membrane to remain wet to increase ionic conductivity.
Based on the technical scheme provided by any embodiment of the invention, when the fuel cell power generation system is in a starting working condition, the fuel gas directly entering the anode and the anode tail gas discharged by the anode do not contain water vapor, so that the embodiment of the invention provides that a separate water vapor loop can be arranged to convey the water vapor to the pumping device, and the pumping device conveys the water vapor, the fuel gas and the anode tail gas to the anode of the fuel cell after mixing.
For example, a preheat recovery unit may be provided which may utilize the high temperature tail gas to obtain steam. Wherein the high-temperature off-gas for enabling the preheating recovery unit to generate water vapor may be anode off-gas, cathode off-gas, or combustion off-gas discharged from a burner, or the like.
When the fuel cell power generation system is in a stable working state, the water vapor in the anode tail gas can meet the requirement, and at the moment, the preheating recovery unit is stopped to convey the water vapor generated by the high-temperature tail gas to the pumping device. In this embodiment, the anode off-gas can be fully utilized without adding water vapor externally, and without discharging waste water.
According to the fuel cell power generation system provided by the embodiment of the invention, the pumping device is introduced when the fuel cell power generation system is in a starting working condition, so that the working efficiency of the fuel cell power generation system can be improved, and the condition that carbon deposition and blockage occur in a pipeline and the pumping device can be effectively prevented on the basis of a negative pressure principle. In addition, the heat of anode tail gas, cathode tail gas, combustion tail gas and the like can be fully recycled.
In the fuel cell power generation system provided by any of the above embodiments of the present invention, a reforming unit may be further provided as required, and the mixed gas mixed by the pumping device may be reformed and converted and then delivered to the anode.
The specific function of the reforming unit provided in this embodiment depends on the specific type of the fuel cell power generation system, and for example, in the case where the methane component in the fuel gas is relatively large, part of methane can be catalytically reformed by the reforming unit to obtain hydrogen and reduce the emission rate of carbon dioxide.
Fig. 1 is a schematic structural diagram of a fuel cell power generation system according to an embodiment of the present invention. A fuel cell power generation system according to an embodiment of the present invention will now be described in detail with reference to fig. 1. In this embodiment, an ejector pump is used as the pumping device, and a regulating valve is used as the regulating unit.
Specifically, fuel gas enters an anode 5 through an ejector pump 1, a reforming unit 3 and a first heat exchanger 4, a part of anode tail gas generated by the anode 5 flows into the ejector pump 1 to generate mixed gas and then is conveyed to the anode 5, the other part of the anode tail gas flows into the heat exchanger 4 to exchange heat with the mixed gas, the anode tail gas after heat exchange flows into a combustor 7 to be combusted, the generated tail gas can be directly discharged or flows into a second heat exchanger 8 to exchange heat with air and then is discharged, the air enters a cathode 6 through an air conveying end 10 and the second heat exchanger 8, and cathode tail gas discharged by the cathode 6 can enter the combustor 7 to provide oxygen for combustion treatment of the anode tail gas.
The injection pump 1 is provided with a bypass with an adjusting valve 2, and the amount of fuel gas flowing into the injection pump 1 is adjusted by the opening of the adjusting valve 2 based on a negative pressure principle so as to realize the control of the circulation ratio of the anode tail gas.
A pipeline through which air can flow may be further disposed between the air delivery end 10 and the combustor 7, and an adjusting valve 11 is disposed on the pipeline, so as to adjust the temperature of the combustion exhaust gas discharged from the combustor 7 by adjusting the opening degree of the adjusting valve 11.
In the fuel cell power generation system provided by this embodiment, a waste heat recovery unit 9 may be further provided between the ejector pump 1 and the second heat exchanger 8, and when the fuel cell power generation system is in the initial start condition, the high-temperature combustion tail gas discharged from the combustor 7 may enter the waste heat recovery unit 9 through the second heat exchanger 8, generate steam in a heating manner, and send the steam to the ejector pump 1.
In the fuel cell power generation system provided by the embodiment of the invention, fresh fuel gas and high-temperature anode tail gas are mixed by an ejector pump, are subjected to reforming or conversion treatment, and enter the anode of the fuel cell after exchanging heat with the high-temperature anode tail gas; the cathode air and the combustion tail gas enter the cathode of the fuel cell after heat exchange, and the tail gas from the cathode directly enters the combustor to support combustion so as to burn out the low-heat-value anode tail gas.
The operating temperature of the fuel cell may range from 500 ℃ to 900 ℃, preferably from 600 ℃ to 800 ℃; the operating pressure of the fuel cell may range from 0.05MPa to 0.25MPa, preferably from 0.1MPa to 0.2 MPa.
The ejector pump is provided with a regulating valve bypass for regulating the high-temperature tail gas circulation amount, and the tail gas circulation ratio is controlled to be 0.3-2.2, and the optimal range is 0.5-2.
The temperature of the outlet of the combustor is controlled to be about 700 ℃ to 900 ℃ through cold air, the outlet of the combustor can be cooled to about 100 ℃ to 300 ℃ after heat exchange with the air at the inlet of the cathode, and then the outlet of the combustor enters the waste heat recovery unit.
When the fuel cell power generation system is in a starting working condition, water vapor generated by waste heat of combustion tail gas is added into the ejector pump to prevent carbon deposition blockage, wherein the adding amount of the water vapor is 1-2 times of the carbon flow of fresh fuel gas.
Fig. 2 is a schematic flow chart of a fuel cell power generation method according to an embodiment of the present invention, which shows that the fuel cell power generation method is applicable to the fuel cell power generation system according to any of the above embodiments of the present invention. As shown in fig. 2, the fuel cell power generation method provided by this embodiment includes steps S110 to S130.
In step S110, fuel gas is supplied to the anode.
In step S120, an oxygen-containing gas is supplied to the cathode.
In step S130, a portion of the anode tail gas is mixed with the fuel gas to obtain a mixed gas, and the mixed gas is supplied to the anode.
Through above-mentioned technical scheme, can make full use of not complete burning fuel gas and temperature in the positive pole tail gas are higher, so such circulation mode can effectively reduce fuel cell tail gas emission and improve fuel cell work efficiency. In addition, because the anode tail gas contains water vapor, a branch for supplying the water vapor is not required to be additionally provided, and the circulation mode can also effectively prevent the carbon deposition blockage
Wherein the circulation ratio of the anode off-gas is 0.3 to 2.2. A preferred range is 0.5 to 2.
In some optional embodiments, another part of the anode tail gas may be subjected to heat exchange with the mixed gas, and the mixed gas after heat exchange is supplied to the anode.
In some alternative embodiments, another part of the anode tail gas and the cathode tail gas can be combusted to obtain combustion tail gas.
In some alternative embodiments, the combustion exhaust gas may be further heat exchanged with the oxygen-containing gas, and the heat exchanged oxygen-containing gas may be supplied to the cathode.
When the fuel cell is in the initial start-up condition, since the anode tailgas temperature is high but it does not yet contain water vapor, water vapor may be added to the gas supplied to the anode in the following manner: obtaining steam by using the combustion tail gas; and mixing the water vapor with the anode off-gas and the fuel gas to obtain the mixed gas, the mixed gas being supplied to the anode.
Wherein, the ratio of the amount of the water vapor to the carbon flow of the fuel gas is 1-2: 1.
in some alternative embodiments, the mixed gas may be reformed according to actual requirements and fuel gas composition, and the reformed mixed gas may be supplied to the anode.
In some alternative embodiments, the fuel cell has an operating temperature of 500 ℃ to 900 ℃ and an operating pressure of 0.05MPa to 0.25 MPa.
For the details and advantages of the fuel cell power generation method provided by the above embodiment of the present invention, reference may be made to the details and advantages of the fuel cell power generation system provided by the present invention, and details will not be described herein.
The technical scheme provided by the invention is explained by a set of 20 kW-level synthesis gas fuel cell power generation system.
In the fuel cell power generation system, 10Nm3Syngas (62% H2, 37% CO) and tail gas (about 10 Nm)3H) mixing and preheating to about 400 ℃, exchanging heat with anode tail gas to about 700 ℃ and entering the solid oxide fuel cell for anode reaction, wherein the fuel utilization rate can reach 80%, the power generation power is 20kW, the temperature of the anode outlet tail gas is about 800 ℃, and partial circulation (10Nm & lt/EN & gt)3H) mixing with fresh gas, exchanging heat between the rest part and feed gas, feeding into combustor, controlling the temperature of combustion tail gas at 830 deg.C, and passing the tail gas through cathode air (flow 200 Nm)3After the reaction is finished, the temperature is reduced to about 150 ℃ and the mixture is discharged; the temperature of the cathode air after heat exchange with the combustion tail gas is about 700 ℃ and enters the fuel cell, and the temperature of the tail gas at the outlet of the cathode is about 800 ℃.
Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the embodiments of the present invention are not limited to the details of the above embodiments, and various simple modifications can be made to the technical solutions of the embodiments of the present invention within the technical idea of the embodiments of the present invention, and the simple modifications all belong to the protection scope of the embodiments of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the embodiments of the present invention do not describe every possible combination.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art to which the present application pertains. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (17)
1. A fuel cell power generation method, comprising:
supplying a fuel gas to the anode;
supplying an oxygen-containing gas to the cathode; and
a portion of the anode tail gas is mixed with the fuel gas to obtain a mixed gas, which is supplied to the anode.
2. The method of claim 1, wherein the anode tail gas recycle ratio is 0.3 to 2.2.
3. The method of claim 1, further comprising:
and exchanging heat between the other part of the anode tail gas and the mixed gas, and supplying the mixed gas after heat exchange to the anode.
4. The method of claim 1, further comprising:
and burning the other part of the anode tail gas and the cathode tail gas to obtain burning tail gas.
5. The method of claim 4, further comprising:
and exchanging heat between the combustion tail gas and the oxygen-containing gas, and supplying the oxygen-containing gas after heat exchange to a cathode.
6. The method of claim 4, further comprising:
obtaining steam by using the combustion tail gas; and
mixing the water vapor with the anode tail gas and the fuel gas to obtain the mixed gas, and supplying the mixed gas to the anode.
7. The method of claim 6,
the ratio of the amount of the water vapor to the carbon flow of the fuel gas is 1-2: 1.
8. the method according to any one of claims 1 to 7, further comprising:
reforming the mixed gas, and supplying the reformed mixed gas to the anode.
9. The method according to any one of claims 1 to 7,
the working temperature of the fuel cell is 500 ℃ to 900 ℃;
the working pressure of the fuel cell is 0.05MPa to 0.25 MPa.
10. A fuel cell power generation system characterized by comprising:
a stack comprising an anode and a cathode;
the pumping device is used for mixing fuel gas and anode tail gas of the anode into mixed gas and supplying the mixed gas to the anode; and
and the adjusting unit is connected with the pumping device and is used for adjusting the proportion of the fuel gas and the anode tail gas in the mixed gas.
11. The fuel cell power generation system according to claim 10, further comprising:
and the first heat exchanger is arranged between the pumping device and the anode and used for exchanging heat of the other part of the anode tail gas and the mixed gas and supplying the mixed gas after heat exchange to the anode.
12. The fuel cell power generation system according to claim 11, further comprising:
and the combustor is connected with the first heat exchanger and the cathode and is used for combusting the other part of the anode tail gas and the cathode tail gas to obtain combustion tail gas.
13. The fuel cell power generation system according to claim 12, wherein a temperature adjusting gas is introduced into the combustor, and the temperature adjusting gas is used to adjust the temperature of the combustion exhaust gas.
14. The fuel cell power generation system according to claim 12, further comprising:
and the second heat exchanger is arranged between the combustor and the cathode and is used for exchanging heat between the combustion tail gas and the oxygen-containing gas and supplying the oxygen-containing gas after heat exchange to the cathode.
15. The fuel cell power generation system according to claim 12, further comprising:
the waste heat recovery unit is arranged between the combustor and the pumping device and used for obtaining water vapor by utilizing the combustion tail gas and conveying the water vapor to the pumping device,
the pumping device is used for mixing the water vapor with the anode tail gas and the fuel gas to obtain the mixed gas, and supplying the mixed gas to the anode.
16. The fuel cell power generation system according to any one of claims 10 to 15, characterized by further comprising:
and the reforming unit is arranged between the pumping device and the anode and is used for reforming the mixed gas and supplying the reformed mixed gas to the anode.
17. A fuel cell power generation system according to any one of claims 10 to 15, wherein the pumping means is a jet pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011311545.6A CN114520355A (en) | 2020-11-20 | 2020-11-20 | Fuel cell power generation system and fuel cell power generation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011311545.6A CN114520355A (en) | 2020-11-20 | 2020-11-20 | Fuel cell power generation system and fuel cell power generation method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114520355A true CN114520355A (en) | 2022-05-20 |
Family
ID=81594540
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011311545.6A Pending CN114520355A (en) | 2020-11-20 | 2020-11-20 | Fuel cell power generation system and fuel cell power generation method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114520355A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115117397A (en) * | 2022-06-16 | 2022-09-27 | 清华大学 | Control method and device of recycling fuel cell system and computer equipment |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6136462A (en) * | 1997-02-21 | 2000-10-24 | Aeg Energietechnik Gmbh | High temperature fuel cells with heating of the reaction gas |
| CN102544549A (en) * | 2010-12-14 | 2012-07-04 | 中国科学院大连化学物理研究所 | Combined heat and power (CHP) supply system based on fuel cell |
| CN105609821A (en) * | 2014-11-14 | 2016-05-25 | 丰田自动车株式会社 | Fuel cell system and control method thereof |
| CN208589494U (en) * | 2018-07-09 | 2019-03-08 | 中国石油大学(北京) | Solid oxide fuel cell association system based on solar energy preparing hydrogen by reforming methanol |
| CN110534770A (en) * | 2018-05-23 | 2019-12-03 | 松下知识产权经营株式会社 | Fuel cell system |
| CN111952642A (en) * | 2020-08-21 | 2020-11-17 | 清华大学 | High-efficiency low-vibration noise fuel cell power generation system |
-
2020
- 2020-11-20 CN CN202011311545.6A patent/CN114520355A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6136462A (en) * | 1997-02-21 | 2000-10-24 | Aeg Energietechnik Gmbh | High temperature fuel cells with heating of the reaction gas |
| CN102544549A (en) * | 2010-12-14 | 2012-07-04 | 中国科学院大连化学物理研究所 | Combined heat and power (CHP) supply system based on fuel cell |
| CN105609821A (en) * | 2014-11-14 | 2016-05-25 | 丰田自动车株式会社 | Fuel cell system and control method thereof |
| CN110534770A (en) * | 2018-05-23 | 2019-12-03 | 松下知识产权经营株式会社 | Fuel cell system |
| CN208589494U (en) * | 2018-07-09 | 2019-03-08 | 中国石油大学(北京) | Solid oxide fuel cell association system based on solar energy preparing hydrogen by reforming methanol |
| CN111952642A (en) * | 2020-08-21 | 2020-11-17 | 清华大学 | High-efficiency low-vibration noise fuel cell power generation system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115117397A (en) * | 2022-06-16 | 2022-09-27 | 清华大学 | Control method and device of recycling fuel cell system and computer equipment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR102254196B1 (en) | Ammonia based solid oxide fuel cell system | |
| EP3050148B1 (en) | A recirculation arrangement and method for a high temperature cell system | |
| CN100459263C (en) | Fuel cell system | |
| JP2005276836A (en) | Method and system for start and transient operation of fuel cell-gas turbine combined system | |
| JP2002530817A (en) | Fuel cell system with improved startable output | |
| WO2010044772A1 (en) | Solid oxide fuel cell with anode exhaust recycle | |
| CN109935855B (en) | Operation method of reforming fuel cell system | |
| JP2006524414A (en) | Energy conversion device, reformer device and fuel cell device therefor | |
| CN113851673A (en) | Solid oxide fuel cell cogeneration system and operation method thereof | |
| US7645532B2 (en) | Solid-oxide fuel cell system having an upstream reformate combustor | |
| CN114024009A (en) | Fuel cell power generation system | |
| CN114520355A (en) | Fuel cell power generation system and fuel cell power generation method | |
| CN109964351B (en) | Integrated fuel cell block with modified fuel cell cycle for integrated reforming fuel cell | |
| US20080292922A1 (en) | Method and apparatus for fueling a solid oxide fuel cell stack assembly | |
| JP4342172B2 (en) | Co-energy system | |
| CN115172800A (en) | Solid oxide fuel cell combined heat and power system | |
| CN101573289A (en) | Reformer, and method for reacting fuel and oxidant to gaseous reformate | |
| CN101473482A (en) | Preheating arrangement in a fuel cell apparatus | |
| CN115101781A (en) | Thermoelectric cogeneration system and method based on flat-tube SOFC | |
| WO2009061299A1 (en) | Catalytic burning of fuel cell anode exhaust upstream of homogeneous burning of startup reformate | |
| JP3897149B2 (en) | Solid oxide fuel cell and Stirling engine combined system | |
| JP4824915B2 (en) | Fuel cell system | |
| JP4158131B2 (en) | Fuel cell power generator | |
| NL2030045B1 (en) | A method for producing hydrogen containing gas | |
| KR100987824B1 (en) | Start-up protocol of Self-sustained Solid Oxide Fuel Cell System |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |