CN114023997A - Ejector for fuel cell air circulation and use method thereof - Google Patents
Ejector for fuel cell air circulation and use method thereof Download PDFInfo
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- CN114023997A CN114023997A CN202111214302.5A CN202111214302A CN114023997A CN 114023997 A CN114023997 A CN 114023997A CN 202111214302 A CN202111214302 A CN 202111214302A CN 114023997 A CN114023997 A CN 114023997A
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- 239000000446 fuel Substances 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims description 12
- 239000012530 fluid Substances 0.000 claims abstract description 77
- 239000007788 liquid Substances 0.000 claims abstract description 17
- 239000007921 spray Substances 0.000 claims description 19
- 230000001105 regulatory effect Effects 0.000 claims description 16
- 238000009792 diffusion process Methods 0.000 claims description 15
- 239000012528 membrane Substances 0.000 claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 5
- 238000005507 spraying Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 5
- 239000001257 hydrogen Substances 0.000 description 5
- 229910052739 hydrogen Inorganic materials 0.000 description 5
- 230000007547 defect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005518 electrochemistry Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- 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
-
- 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
- H01M8/04089—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants
- H01M8/04119—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants with simultaneous supply or evacuation of electrolyte; Humidifying or dehumidifying
- H01M8/04126—Humidifying
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
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- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Fuel Cell (AREA)
Abstract
The invention discloses an ejector for fuel cell air circulation, which is used in the air path circulation of a fuel cell system and comprises an ejector body; the input end and the output end of the ejector body are respectively provided with a galvanic pile inlet valve and an ejector outlet, and the ejector outlet is used for communicating with a galvanic pile air inlet; a backflow inlet is formed on the inner wall of the ejector body and communicated with the electric pile outlet; the secondary fluid at the outlet of the galvanic pile is ejected into the ejector body by the backflow inlet and is fully converged with the main fluid introduced by the inlet valve of the galvanic pile. The ejector increases the diameter size of the inlet and the outlet structure, reduces the diameter size of the backflow inlet, is suitable for an air path of a fuel cell system, meets the ejection requirement of the air path, and improves the liquid ejection function of the ejector. The ejector realizes the circulation of air in the air path, improves the flow of the air in the air path, and increases the humidity of the air in the air path, thereby improving the performance of the fuel cell.
Description
Technical Field
The invention relates to the technical field of ejectors, in particular to an ejector for fuel cell air circulation and a using method thereof.
Background
Fuel cell vehicle technology is rapidly developing, and a fuel cell system is used as a power generation device to convert chemical energy into electric energy. The hydrogen fuel cell is a clean energy source, is environment-friendly and is receiving wide attention.
Since the air of the fuel cell system needs to be humidified to achieve proper stack operating conditions. The traditional method is to add a membrane to humidify the inlet and outlet of the air of the electric pile, thereby humidifying the air humidity at the inlet of the electric pile. However, the membrane humidifier has high manufacturing cost and high system cost; and the membrane humidifier can not carry out air circulation on an air path, and the performance of the fuel cell can not be improved.
The ejector in the hydrogen path exists in the prior art, but the diameter sizes of the hydrogen path and the air path in the fuel cell system are different, the diameter size of the ejector used in the hydrogen circulation path is small, the use of the air path cannot be met, and gas instead of liquid flows back in the hydrogen path. Accordingly, there is a need for an improved design for an eductor in the prior art for use in a fuel cell air circuit.
Disclosure of Invention
The invention overcomes the defects of the prior art and provides the ejector for fuel cell air circulation and the use method thereof.
The invention aims to provide a scheme for changing the humidity of an air circulation path and a proton exchange membrane in a fuel cell by using an ejector, which increases the air humidity of a cathode or the humidity of the proton exchange membrane by refluxing unreacted air in the cathode of the fuel cell and water generated by electrochemistry to an air inlet of a galvanic pile so as to ensure that the air humidity of the cathode or the humidity of the proton exchange membrane in the fuel cell reaches the optimal operation reaction condition.
In order to achieve the purpose, the invention adopts the technical scheme that: an ejector for fuel cell air circulation, which is used in the air path circulation of a fuel cell system, comprises an ejector body and is characterized in that,
the input end and the output end of the ejector body are respectively provided with a galvanic pile inlet valve and an ejector outlet;
the electric pile inlet valve is used for introducing main fluid into the ejector body; the ejector outlet is used for being communicated with the air inlet of the electric pile;
a backflow pipe is formed on the inner wall of the ejector body; the return pipe is communicated with the outlet of the electric pile; the secondary fluid at the outlet of the galvanic pile is injected into the injector body through the return pipe and is fully converged with the main fluid introduced through the inlet valve of the galvanic pile;
the secondary fluid at the stack outlet is in a liquid state comprising a mixture of unreacted air and water in the stack.
In a preferred embodiment of the invention, the stack inlet valve is integrated with the injector body into a single structure.
In a preferred embodiment of the invention, the diameter sizes of the input end of the ejector body and the outlet of the ejector are both 38-100 mm.
In a preferred embodiment of the present invention, the diameter of the return pipe is 10 to 50 mm.
In a preferred embodiment of the invention, the ejector body comprises a spray pipe, a mixing chamber communicated with the spray pipe, and a diffusion chamber connected with the mixing chamber; the input end and the output end of the spray pipe are respectively connected with the electric pile inlet valve and the mixing chamber; the inner wall of the mixing chamber is formed with the return pipe.
In a preferred embodiment of the present invention, the pressure-expanding chamber is formed with a trumpet structure with a divergent section along a length direction.
In a preferred embodiment of the present invention, the return pipe is communicated with a discharge pipe through a regulating valve, a part of the secondary fluid flows back into the ejector body through the return pipe, and the other part of the secondary fluid is discharged through the regulating valve.
The invention also provides a use method of the ejector for fuel cell air circulation, which comprises the following steps:
s1, spraying the main fluid from the inlet valve of the galvanic pile to a mixing chamber in the center of the ejector body through a spray pipe;
s2, a return pipe sucks partial liquid secondary fluid in the galvanic pile, the secondary fluid passes through the spray pipe and is sucked into the mixing chamber together with the primary fluid around the contracted cone outlet, so that the primary fluid and the secondary fluid are mixed in the mixing chamber for heat transfer, mass transfer, uniform velocity, pressure equalization and humidification; another part of the secondary fluid is discharged through the regulating valve;
and S3, outputting the mixed fluid to the diffusion chamber from the tail end of the mixing chamber, and outputting the humidified mixed fluid to the air inlet of the cathode of the stack from the ejector outlet of the diffusion chamber.
In a preferred embodiment of the present invention, in S2, the flow rate of the secondary fluid injected into the mixing chamber is controlled by a regulating valve, and the regulating valve is regulated according to: so that the air humidity of the cathode or the humidity of the proton exchange membrane in the fuel cell can reach the optimal operation reaction condition.
In a preferred embodiment of the present invention, in S2, the starting condition for the return pipe to suck the partial liquid secondary fluid in the stack is as follows: the power required by the fuel cell system is greater than P1, and the humidifying function of the return pipe is started; if the power demand of the fuel cell system is not greater than P1, continuing to step S1; where P1 is the predetermined power, P1 depends on the size of the fuel cell stack.
The invention solves the defects in the background technology, and has the following beneficial effects:
(1) the invention improves the ejector in the prior art, respectively enlarges the structural diameter size of the inlet and the outlet of the ejector body and reduces the diameter size of the backflow inlet, so that the ejector is suitable for an air passage of a fuel cell system, meets the ejection requirement of the air passage and realizes the function of ejecting liquid by the ejector.
(2) According to the invention, the mixture of unreacted air and water at the outlet of the galvanic pile is injected into the injector body by the return inlet of the injector, and is fully converged with the main fluid introduced by the inlet valve of the galvanic pile, so that the circulation of air in the air path is realized, the air flow in the air path is improved, the humidity of the air in the air path is increased, and the performance of the fuel cell is improved. In addition, the price of the ejector is lower than that of the membrane humidifier, so that the system cost is reduced.
(3) The invention controls the flow of the secondary fluid injected into the mixing chamber through the regulating valve, and the regulating basis of the regulating valve is to ensure that the air humidity of the cathode in the fuel cell or the humidity of the proton exchange membrane reaches the optimal operation reaction condition, so as to realize the intelligent control of the air circulation system of the fuel cell.
(4) The main fluid is dry air, the secondary fluid is liquid, dry-wet mixing of the air is realized, and accurate moisture control of the air in the air circulation path is realized by combining a dry-wet gas mixing and moisture control method, so that the condition that the entering air meets the proper operation humidity required by the fuel cell for keeping higher efficiency is ensured.
(5) The ejector is additionally arranged in the air path, the flow velocity of air is improved through the spray pipe, the backflow efficiency of the ejector is improved, the increase of moisture in the air path is further ensured, and the performance of the fuel cell is improved.
(6) According to the invention, the electric pile inlet valve and the ejector body are integrated into a whole structure, so that the ejector structure is more compact, and the ejection efficiency of the ejector is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts;
fig. 1 is a schematic perspective view of an ejector for air circulation of a fuel cell according to a preferred embodiment of the present invention;
FIG. 2 is a perspective view of an eductor in accordance with a preferred embodiment of the present invention;
in the figure: 1. an ejector body; 2. a stack inlet valve; 3. a nozzle; 4. a reflux inlet; 5. a mixing chamber; 6. a pressure expansion chamber; 7. an ejector outlet.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art through specific situations.
As shown in fig. 1, a schematic perspective view of an ejector for air circulation of a fuel cell is shown. In the field of fuel cell stacks, the electric power output of the fuel cell stack basically depends on the sufficient humidification of a membrane, so that the ejector is additionally arranged in an air path, the ejector improves the flow rate of air through the spray pipe 3, the backflow efficiency of the ejector is accelerated, the increase of moisture in the air path is further ensured, and the performance of a fuel cell is improved. The ejector is used in an air circuit cycle of a fuel cell system and comprises an ejector body 1. The input end and the output end of the ejector body 1 are respectively provided with a galvanic pile inlet valve 2 and an ejector outlet 7. The ejector outlet 7 is used for being communicated with the air inlet of the pile.
The electric pile inlet valve 2 is used for introducing main fluid into the ejector body 1; according to the invention, the galvanic pile inlet valve 2 and the ejector body 1 are integrated into a whole structure, so that the ejector structure is more compact, and the ejection efficiency of the ejector is improved.
Be formed with backflow inlet 4 on the inner wall of ejector body 1, backflow inlet 4 intercommunication galvanic pile export, and backflow inlet 4 intercommunication galvanic pile exit. The backflow inlet 4 can inject secondary fluid at the outlet of the galvanic pile into the ejector body 1 and fully converges with the secondary fluid introduced by the inlet valve 2 of the galvanic pile. Wherein the secondary fluid comprises a mixture of unreacted air and water in the cathode of the stack.
Referring to fig. 2, a perspective view of the eductor of the present invention is shown. The ejector body 1 includes a nozzle 3, a mixing chamber 5 communicating with the nozzle 3, and a diffusion chamber 6 connecting the mixing chamber 5. The input end and the output end of the spray pipe 3 are respectively connected with the inlet valve 2 of the electric pile and the mixing chamber 5. A convergent cone outlet structure is formed between the nozzle 3 and the mixing chamber 5. The inner wall of the mixing chamber 5 is formed with a return inlet 4. The diffusion chamber 6 is formed with a horn structure having a gradually expanding cross section in the longitudinal direction.
The pressure of the main fluid source is higher, and the pressure of the secondary fluid source is lower or non-pressure; the main fluid is in a gas state; and the secondary fluid is in the form of a liquid or liquid-vapor mist. The main fluid from the electric pile inlet valve 2 is sprayed to a mixing chamber 5 in the center of the ejector body 1 through a spray pipe 3, meanwhile, the secondary fluid from a backflow inlet 4 is sucked, passes through the spray pipe 3 and is sucked into the mixing chamber 5 together with the main fluid around a contracted cone outlet, so that the main fluid and the secondary fluid are mixed in the mixing chamber 5 for heat transfer, mass transfer, uniform speed and pressure equalization, and then are output to a diffusion chamber 6 from the tail end of the mixing chamber 5, and the humidified mixed fluid is output to an air inlet of an electric pile cathode from an ejector outlet 7 of the diffusion chamber 6.
The ejector in the prior art has a function of large flow, but the backflow is gas rather than liquid, the ejector in the prior art cannot meet the requirement of air ejection and cannot achieve the function of ejecting liquid. The ejector in the prior art is improved, the calibers of the input end of the ejector body 1, the ejector outlet 7 and the backflow inlet 4 are redesigned, the diameter sizes of the input end of the ejector body 1 and the ejector outlet 7 are 38-100 mm, and the diameter size of the backflow inlet 4 is 10-50 mm. The improvement enlarges the structural diameter size of the inlet and the outlet of the ejector body, reduces the diameter size of the backflow inlet 4, so that the ejector is suitable for an air path of a fuel cell system, meets the ejection requirement of the air path, and improves the liquid ejection function of the ejector.
According to the invention, the ejector backflow inlet 4 ejects the mixture of unreacted air and water at the outlet of the galvanic pile into the ejector body 1 and is fully converged with the main fluid introduced by the galvanic pile inlet valve 2, so that the circulation of air in an air path is realized, the flow of the air in the air path is improved, the humidity of the air in the air path is increased, and the performance of the fuel cell is improved. In addition, the price of the ejector is lower than that of the membrane humidifier, so that the system cost is reduced.
The invention also provides a use method of the ejector for fuel cell air circulation, which comprises the following steps:
s1, spraying the main fluid from the inlet valve of the galvanic pile to a mixing chamber in the center of the ejector body through a spray pipe;
s2, a return pipe sucks partial liquid secondary fluid in the galvanic pile, the secondary fluid passes through the spray pipe and is sucked into the mixing chamber together with the primary fluid around the contracted cone outlet, so that the primary fluid and the secondary fluid are mixed in the mixing chamber for heat transfer, mass transfer, uniform velocity, pressure equalization and humidification; another part of the secondary fluid is discharged through the regulating valve;
and S3, outputting the mixed fluid to the diffusion chamber from the tail end of the mixing chamber, and outputting the humidified mixed fluid to the air inlet of the cathode of the stack from the ejector outlet of the diffusion chamber.
Wherein, the secondary fluid draws the flow of penetrating to the mixing chamber to pass through governing valve control, and the regulation basis of governing valve is: so that the air humidity of the cathode or the humidity of the proton exchange membrane in the fuel cell can reach the optimal operation reaction condition. It should be noted that the optimum reaction conditions in the present invention are conditions that yield the maximum reaction efficiency at a certain temperature, a certain humidity and a certain gas concentration.
The starting conditions for the return pipe to suck partial liquid secondary fluid in the galvanic pile are as follows: the power required by the fuel cell system is greater than P1, and the humidifying function of the return pipe is started; if the power demand of the fuel cell system is not greater than P1, continuing to step S1; where P1 is the predetermined power, P1 depends on the size of the fuel cell stack.
The main fluid is dry air, the secondary fluid is liquid, dry-wet mixing of the air is realized, and accurate moisture control of the air in the air circulation path is realized by combining a dry-wet gas mixing and moisture control method, so that the condition that the entering air meets the proper operation humidity required by the fuel cell for keeping higher efficiency is ensured.
When the invention is used, the ejector body 1 is arranged in an air path of a fuel cell, a main fluid is introduced through an electric pile inlet valve 2 at one side of the ejector body 1, the main fluid is sprayed to a mixing chamber 5 in the center of the ejector body 1 through a spray pipe 3, meanwhile, a secondary fluid from a backflow inlet 4 is sucked, the secondary fluid passes through the spray pipe 3 and is sucked into the mixing chamber 5 together with the main fluid at the periphery of a contracted cone outlet, so that the main fluid and the secondary fluid are mixed to transfer heat, mass, uniform speed and uniform pressure in the mixing chamber 5, and are output to a diffusion chamber 6 from the tail end of the mixing chamber 5, the humidified mixed fluid is output to an air inlet of an electric pile cathode from an ejector outlet 7 of the diffusion chamber 6, the mixed fluid humidifies the air humidity in the electric pile, meets the proper operation condition of the electric pile, and improves the performance of the fuel cell.
In light of the foregoing description of the preferred embodiment of the present invention, it is to be understood that various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (10)
1. An ejector for fuel cell air circulation, which is used in the air path circulation of a fuel cell system, comprises an ejector body and is characterized in that,
the input end and the output end of the ejector body are respectively provided with a galvanic pile inlet valve and an ejector outlet; the electric pile inlet valve is used for introducing main fluid into the ejector body; the ejector outlet is used for being communicated with the air inlet of the electric pile;
a backflow pipe is formed on the inner wall of the ejector body; the return pipe is communicated with the outlet of the electric pile; the secondary fluid at the outlet of the galvanic pile is injected into the injector body through the return pipe and is fully converged with the main fluid introduced through the inlet valve of the galvanic pile;
the secondary fluid at the stack outlet is in a liquid state comprising a mixture of unreacted air and water in the stack.
2. The ejector for fuel cell air circulation according to claim 1, wherein: the electric pile inlet valve and the ejector body are integrated into a whole structure.
3. The ejector for fuel cell air circulation according to claim 1, wherein: the diameter size of the input end of the ejector body and the diameter size of the outlet of the ejector are both 38-100 mm.
4. The ejector for fuel cell air circulation according to claim 1, wherein: the diameter size of the return pipe is 10-50 mm.
5. The ejector for fuel cell air circulation according to claim 1, wherein: the ejector body comprises a spray pipe, a mixing chamber communicated with the spray pipe and a diffusion chamber connected with the mixing chamber; the input end and the output end of the spray pipe are respectively connected with the electric pile inlet valve and the mixing chamber; the inner wall of the mixing chamber is formed with the return pipe.
6. The ejector for fuel cell air circulation according to claim 5, wherein: the diffusion chamber is formed with a horn structure with a gradually-expanded cross section along the length direction.
7. The ejector for fuel cell air circulation according to claim 1, wherein: the backflow pipe is communicated with a discharge pipe through a regulating valve, one part of the secondary fluid flows back into the ejector body through the backflow pipe, and the other part of the secondary fluid is discharged through the regulating valve.
8. The use method of the fuel cell air circulation ejector according to any one of claims 1 to 7, characterized by comprising the following steps:
s1, spraying the main fluid from the inlet valve of the galvanic pile to a mixing chamber in the center of the ejector body through a spray pipe;
s2, a return pipe sucks partial liquid secondary fluid in the galvanic pile, the secondary fluid passes through the spray pipe and is sucked into the mixing chamber together with the primary fluid around the contracted cone outlet, so that the primary fluid and the secondary fluid are mixed in the mixing chamber for heat transfer, mass transfer, uniform velocity, pressure equalization and humidification; another part of the secondary fluid is discharged through the regulating valve;
and S3, outputting the mixed fluid to the diffusion chamber from the tail end of the mixing chamber, and outputting the humidified mixed fluid to the air inlet of the cathode of the stack from the ejector outlet of the diffusion chamber.
9. The method of using an ejector for fuel cell air circulation according to claim 8, wherein: in S2, the flow rate of the secondary fluid injected into the mixing chamber is controlled by a regulating valve, and the regulating valve is regulated according to the following conditions: so that the air humidity of the cathode or the humidity of the proton exchange membrane in the fuel cell can reach the optimal operation reaction condition.
10. The method of using an ejector for fuel cell air circulation according to claim 8, wherein: in S2, the start condition for the return pipe to suck the secondary fluid in the partial liquid state in the stack is as follows: the power required by the fuel cell system is greater than P1, and the humidifying function of the return pipe is started; if the power demand of the fuel cell system is not greater than P1, continuing to step S1; where P1 is the predetermined power, P1 depends on the size of the fuel cell stack.
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| CN202111214302.5A CN114023997A (en) | 2021-10-19 | 2021-10-19 | Ejector for fuel cell air circulation and use method thereof |
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| CN202111214302.5A CN114023997A (en) | 2021-10-19 | 2021-10-19 | Ejector for fuel cell air circulation and use method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114744246A (en) * | 2022-04-13 | 2022-07-12 | 佛山仙湖实验室 | Fuel cell system and air humidity adjusting method thereof |
| CN114744246B (en) * | 2022-04-13 | 2024-03-19 | 佛山仙湖实验室 | Fuel cell system and air humidity adjusting method thereof |
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Application publication date: 20220208 |