CN109687000B - Shutdown discharging device and method for fuel cell system - Google Patents
Shutdown discharging device and method for fuel cell system Download PDFInfo
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- CN109687000B CN109687000B CN201910128242.1A CN201910128242A CN109687000B CN 109687000 B CN109687000 B CN 109687000B CN 201910128242 A CN201910128242 A CN 201910128242A CN 109687000 B CN109687000 B CN 109687000B
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- 239000000446 fuel Substances 0.000 title claims abstract description 73
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000007599 discharging Methods 0.000 title claims description 8
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 121
- 239000001257 hydrogen Substances 0.000 claims abstract description 114
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 114
- 239000001301 oxygen Substances 0.000 claims abstract description 36
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 36
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 35
- 208000028659 discharge Diseases 0.000 claims abstract description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 6
- 230000001502 supplementing effect Effects 0.000 claims abstract description 6
- 239000007789 gas Substances 0.000 claims description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 230000007246 mechanism Effects 0.000 claims description 9
- 239000012466 permeate Substances 0.000 claims description 7
- 238000012544 monitoring process Methods 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 4
- 230000009471 action Effects 0.000 abstract description 3
- 230000003197 catalytic effect Effects 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000009428 plumbing Methods 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
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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
- H01M8/04223—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids during start-up or shut-down; Depolarisation or activation, e.g. purging; Means for short-circuiting defective fuel cells
- H01M8/04228—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids during start-up or shut-down; Depolarisation or activation, e.g. purging; Means for short-circuiting defective fuel cells during shut-down
-
- 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
- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
- H01M8/043—Processes for controlling fuel cells or fuel cell systems applied during specific periods
- H01M8/04303—Processes for controlling fuel cells or fuel cell systems applied during specific periods applied during shut-down
-
- 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
- H01M8/04313—Processes for controlling fuel cells or fuel cell systems characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function
- H01M8/0438—Pressure; Ambient pressure; Flow
- H01M8/04388—Pressure; Ambient pressure; Flow of anode reactants at the inlet or inside the fuel cell
-
- 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
-
- 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 relates to a shutdown discharge device and method of a fuel cell system, in the shutdown discharge stage of the fuel cell system, a small current is loaded on a bus of a fuel cell system electric pile, the residual air in an air path is forced to flow in a circulating way by utilizing the action of a circulating pump, and the oxygen component in the air in an air cavity of the electric pile, an air path component of the system and a pipeline is rapidly consumed by matching with the continuous supply of hydrogen in the hydrogen path, so that a nitrogen-rich environment is formed, and the voltage of the electric pile is rapidly reduced; and meanwhile, the duration of loading small current is judged according to the voltage of the electric pile, the duration of the circulating pump and the hydrogen supplementing duration of the hydrogen circuit are judged according to the oxygen concentration of the air circuit monitored by the oxygen concentration sensor, so that no oxygen component in the cavity of the electric pile is basically permeated into the hydrogen cavity, and the influence of the hydrogen-oxygen interface of the hydrogen circuit on the service life of the electric pile during starting is reduced.
Description
Technical Field
The invention relates to the technical field of fuel cell systems, in particular to a shutdown discharging device and method of a fuel cell system.
Background
When the fuel cell system is shut down, the average voltage of the electric pile is higher, and the service life of the electric pile is greatly damaged by the high potential, so that the service life of the electric pile is effectively prolonged by rapidly reducing the voltage of the electric pile.
When the fuel cell system is started, air is introduced into the air side of the system, hydrogen is introduced into the hydrogen side, if air (oxygen) exists in the hydrogen side, the hydrogen forms a flowing hydrogen/air (hydrogen/oxygen) interface in the anode flow field under the condition of continuous introduction of the hydrogen, and finally the hydrogen is pushed to the outlet of the electric pile. The hydrogen/air (hydrogen/oxygen) interface can cause oxygen reduction reaction to exist on the anode and the cathode at the same time, so that a very high potential is formed on the surface of the cathode catalytic layer, and the anode has reverse current, thereby causing serious attenuation on the cathode catalytic layer. Also, if residual hydrogen and oxygen remain in the stack, auxiliary components and plumbing after the fuel cell system is shut down, the oxygen on the cathode side permeates through the proton exchange membrane to the anode side due to the concentration gradient, which is a relatively slow but relatively long process, and also causes degradation of the cathode catalytic layer. The fuel cell system in the prior art has no method capable of avoiding the generation of a hydrogen/air (hydrogen/oxygen) interface on the anode side of the electric pile after shutdown and when the electric pile is started next time, and the service life of the electric pile and the sealing performance of the whole system are affected.
Disclosure of Invention
The present invention is directed to a shutdown discharge device and method for a fuel cell system that overcomes the above-described drawbacks of the prior art.
The aim of the invention can be achieved by the following technical scheme:
the utility model provides a fuel cell system shutdown discharging device, includes the fuel cell pile, respectively with the air circuit, the hydrogen way of fuel cell pile connection and set up the circulating pump between air circuit and hydrogen way, the air circuit including air cleaner, air flowmeter, the throttle valve that admits air, air compressor and the humidifier that connect gradually, the humidifier is connected with the positive pole of fuel cell pile, the export of humidifier is connected with air exhaust mechanism, the hydrogen way include the hydrogen that connects gradually with the negative pole of fuel cell pile go into pile pressure sensor and low pressure hydrogen supply device, the hydrogen export of fuel cell pile is connected with hydrogen way drainage exhaust mechanism, the hydrogen goes into the junction of pile pressure sensor and the positive pole of fuel cell pile and is equipped with first gas solenoid valve for the first gas, the circulating pump is connected with the air compressor, the second gas solenoid valve for the second gas is connected with the solenoid valve for the air compressor after connecting with the third gas solenoid valve for the circulating pump, the export of humidifier is connected with the fourth gas solenoid valve for the second gas after connecting with the circulating pump.
Preferably, an oxygen concentration sensor is arranged between the humidifier and the fuel cell stack.
Preferably, the air exhaust mechanism comprises an air back pressure valve and an air tail exhaust pipe which are sequentially connected with an outlet of the humidifier.
Preferably, the hydrogen path drainage and exhaust mechanism comprises a hydrogen circulation path water separator, a hydrogen path drain valve and a hydrogen path exhaust valve, a hydrogen outlet of the fuel cell stack is connected with the hydrogen circulation path water separator, one side of the hydrogen circulation path water separator is respectively connected with the hydrogen path drain valve and the hydrogen path exhaust valve, the other side of the hydrogen circulation path water separator is connected with a second gas electromagnetic valve, and the hydrogen path drain valve and the hydrogen path exhaust valve are connected with an air tail calandria.
Preferably, the circulating pump adopts an electric circulating pump with adjustable rotating speed.
Preferably, the fuel cell stack is provided with a voltage sensor and a current sensor for detecting the voltage and the current of the fuel cell stack.
Preferably, an intercooler is arranged between the air compressor and the humidifier.
A method of shutdown discharge of a fuel cell system, the method comprising the steps of:
step one, air enters a fuel cell system through an air filter, an air flow meter detects the air flow entering the fuel cell system, and an air compressor compresses the air to the pressure and flow required by the system;
step two, before stopping the discharging process, the air compressor stops working, the air inlet throttle valve and the air back pressure valve are closed at the same time, the first air electromagnetic valve and the second air electromagnetic valve are closed, the third air electromagnetic valve and the fourth air electromagnetic valve are opened, the air path forms a closed space, and the circulating pump is transferred from the hydrogen path to the air path;
continuously supplementing hydrogen with certain pressure by utilizing a low-pressure hydrogen supply device according to actual requirements, closing a hydrogen path drain valve and a hydrogen path exhaust valve, and setting the rotating speed of a circulating pump;
loading a calibrated small current on a bus of the fuel cell stack rapidly, monitoring a current value by a current sensor, pulling down the total voltage of the fuel cell stack, and starting shutdown discharge;
continuously supplementing hydrogen in the hydrogen gas path, starting a circulating pump to forcibly circulate the air in the annular gas path, and circulating air in the fuel cell stack, the air compressor, the intercooler, the humidifier and the pipeline to quickly consume oxygen in the air path;
step six, monitoring the total voltage value of the pile through a voltage sensor, triggering the lower limit, and stopping current loading; meanwhile, the oxygen concentration of the air channel is monitored through an oxygen concentration sensor of the air channel, and when the oxygen concentration is reduced to a certain value, the circulating pump and the low-pressure hydrogen supply device are stopped;
and step seven, after the circulating pump stops working, stopping the discharge stage, and enabling hydrogen to permeate into the air path from the hydrogen path, and enabling nitrogen of the air path to permeate into the hydrogen path from the air path.
Compared with the prior art, the invention has the following advantages:
1. before stopping discharge, the invention turns the circulating pump from a hydrogen circulating path to an air circulating path through opening and closing 4 electromagnetic valves for gas; after the shutdown discharge, the circulating pump is turned into a hydrogen circulating path from an air circulating path by opening and closing the 4 gas electromagnetic valves, and the invention fully utilizes the action of the circulating pump, and after the shutdown, a nitrogen-rich environment is rapidly formed by accelerating the voltage dropping speed of the electric pile, so that the influence of an anode hydrogen measuring empty interface on the service life in the next startup is fully avoided;
2. the invention is provided with the pressure sensor at the hydrogen gas inlet side of the fuel cell system, can be used as feedback quantity to control the pressure value of the fed hydrogen gas, and is beneficial to improving the control precision of the hydrogen gas pressure.
Drawings
FIG. 1 is a schematic diagram of a shutdown discharge device for a fuel cell system according to the present invention;
FIG. 2 is a flow chart of a fuel cell system shutdown discharge method according to the present invention;
the reference numerals in the figures indicate:
1. the device comprises an air filter, 2, an air main flow meter, 3, an air inlet throttle valve, 4, an air compressor, 5, an intercooler, 6, a humidifier, 7, an oxygen concentration sensor, 8, a fuel cell stack, 9, an air back pressure valve, 10, an air tail drain pipe, 11, a hydrogen circulation path water separator, 12, a hydrogen path drain valve, 13, a hydrogen path exhaust valve, 14, a hydrogen inlet stack pressure sensor, 15, a low-pressure hydrogen supply device, 16, a first gas electromagnetic valve, 17, a second gas electromagnetic valve, 18, a circulating pump, 19, a third gas electromagnetic valve, 20, a fourth gas electromagnetic valve, 21, a voltage sensor, 22 and a current sensor.
Detailed Description
The invention will now be described in detail with reference to the drawings and specific examples. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
As shown in fig. 1, the present invention relates to a fuel cell system stop discharging device, which comprises an air filter 1, an air inlet throttle valve 3, an air compressor 4, a humidifier 6, a fuel cell stack 8, an air back pressure valve 9, an oxygen concentration sensor 7, a circulating pump 18, a hydrogen gas inlet stack pressure sensor 14, a low-pressure hydrogen supply device 15 and four gas solenoid valves.
The air filter 1 is connected with the air flow meter 2 and then is connected with the air inlet throttle valve 3, the air inlet throttle valve 3 is arranged on the air compressor 4, the air compressor 4 is connected with the humidifier 6 through the intercooler 5, and the humidifier 6 is connected with the cathode of the fuel cell stack 8. An oxygen concentration sensor 7 is also provided between the humidifier 6 and the fuel cell stack 8. The anode of the fuel cell stack 8 is connected to a hydrogen supply mechanism including a hydrogen in-stack pressure sensor 14 and a low-pressure hydrogen supply device 15, which are sequentially connected to the anode of the fuel cell stack 8. The hydrogen outlet of the fuel cell stack 8 is connected with a hydrogen circulation path water separator 11, and one side of the hydrogen circulation path water separator 11 is respectively connected with a hydrogen path drain valve 12 and a hydrogen path exhaust valve 13. The hydrogen path drain valve 12 and the hydrogen path drain valve 13 are connected to the air tail pipe 10, and the humidifier 6 is connected to the air tail pipe 10 through the air back pressure valve 9.
A first electromagnetic valve 16 for gas is arranged at the joint of the hydrogen gas in-pile pressure sensor 14 and the anode of the fuel cell stack 8, and the first electromagnetic valve 16 for gas is connected with a circulating pump 18; the air compressor 4 is connected to a third air solenoid valve 19 and then connected to a circulation pump 18. The other side of the hydrogen circulation path water separator 11 is connected with a second electromagnetic valve 17 for gas, and the second electromagnetic valve 17 for gas is connected with a circulation pump 18; the outlet of the humidifier 6 is connected to a fourth air solenoid valve 20 and then to a circulation pump 18. Preferably, the circulation pump 18 is an electric circulation pump with an adjustable rotation speed.
The invention also relates to a shutdown discharging method of the fuel cell system, which is based on the device, as shown in fig. 2, and comprises the following main procedures:
atmospheric air enters the fuel cell system through the air filter 1, the air flow meter 2 can measure the air flow rate into the fuel cell system, and the air compressor 4 compresses the air to the pressure and flow rate required by the system. Before stopping the discharge process, the air compressor 4 will stop working, the air intake throttle valve 3 and the air back pressure valve 9 are closed at the same time, the first air solenoid valve 16 and the second air solenoid valve 17 are closed, the third air solenoid valve 19 and the fourth air solenoid valve 20 are opened, at this time, the air path forms a closed space, and the circulation pump 18 is transferred from the hydrogen path to the air path.
The low-pressure hydrogen supply device 15 continuously supplements hydrogen with pressure P according to the strategy requirement, closes the hydrogen path drain valve 12 and the hydrogen path exhaust valve 13, and sets the rotating speed RPM of the circulating pump 18. Because oxygen and hydrogen exist at the cathode and anode of the fuel cell stack 8, the voltage of the fuel cell stack 8 is high at this time, and a calibrated small current I is quickly applied to the bus of the fuel cell stack 8, for example, by using an electronic load device to apply a small current (if a small current is applied to the fuel cell vehicle by DC/DC), the current value is monitored by the current sensor 22, the total voltage of the fuel cell stack 8 is pulled down, and shutdown discharge begins.
The hydrogen in the hydrogen gas path is continuously fed in, and at the moment, the circulating pump 18 is started to forcedly circulate the air in the annular gas path, so that the air in the fuel cell stack 8, the air compressor 4, the intercooler 5, the humidifier 6 and the pipeline is circulated, and the oxygen in the air path is rapidly consumed.
The total voltage value V of the pile is monitored by the voltage sensor 21, the lower limit is triggered, and the current loading is stopped. Meanwhile, the oxygen concentration of the air channel is monitored by the oxygen concentration sensor 7 of the air channel, and when the oxygen concentration is reduced to a certain value phi, the circulating pump 18 and the low-pressure hydrogen supply device 15 are stopped.
As long as oxygen and hydrogen exist at the cathode and anode of the fuel cell stack 8, a certain voltage is generated, and in general, the total voltage V of the fuel cell stack 8 triggers a lower limit value, stops loading current, and then stops the operation of the circulation pump 18 when the oxygen concentration drops to a certain value Φ.
When the circulation pump 18 stops working, the shutdown discharge phase ends, and the air circuit is substantially free of oxygen, and hydrogen permeates from the hydrogen circuit to the air circuit due to the concentration gradient and the pressure difference; nitrogen from the air path will permeate from the air path to the hydrogen path due to the concentration gradient.
The invention adopts the design of adding four electromagnetic valves for gas and oxygen concentration sensors, and realizes different circulation actions of the circulating pump in the hydrogen and air paths through switching of the electromagnetic valves. After the fuel cell system is stopped and discharged, the high potential of the electric pile is quickly pulled down by loading small current, and meanwhile, the circulating pump is switched from the hydrogen path to the air path, so that air in the electric pile and the air path is forcibly circulated, oxygen is quickly consumed by utilizing a hydrogen supplementing strategy, a nitrogen-rich environment is formed in the air path, the generation of a hydrogen/air (hydrogen/oxygen) interface is avoided to the greatest extent, and the service life of the electric pile is further prolonged.
While the invention has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that various changes and substitutions may be made without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (6)
1. The utility model provides a fuel cell system shutdown discharge device, its characterized in that includes fuel cell pile (8), respectively with fuel cell pile (8) connected air circuit, hydrogen way and set up circulating pump (18) between air circuit and hydrogen way, the air way including air filter (1), air flowmeter (2), air inlet throttle valve (3), air compressor (4) and humidifier (6) that connect gradually, humidifier (6) are connected with the positive pole of fuel cell pile (8), the export of humidifier (6) is connected with air exhaust mechanism, the hydrogen way include hydrogen income heap pressure sensor (14) and low pressure hydrogen supply device (15) that connect gradually with the positive pole of fuel cell pile (8), the hydrogen export of fuel cell pile (8) is connected with hydrogen way drainage exhaust mechanism, the junction of hydrogen income heap pressure sensor (14) and fuel cell pile (8) positive pole is equipped with first solenoid valve (16), first solenoid valve (16) are connected circulating pump (18), air compressor (4) are connected with third solenoid valve (19) and access second solenoid valve (17) are connected with circulating pump (17), the outlet of the humidifier (6) is connected with a fourth electromagnetic valve (20) for gas and then connected with a circulating pump (18);
an oxygen concentration sensor (7) is arranged between the humidifier (6) and the fuel cell stack (8);
the fuel cell stack (8) is provided with a voltage sensor (21) and a current sensor (22) for detecting the voltage and the current of the fuel cell stack (8).
2. A fuel cell system stop discharge device according to claim 1, wherein the air exhaust mechanism comprises an air back pressure valve (9) and an air tail pipe (10) which are connected in sequence with the outlet of the humidifier (6).
3. The shutdown discharge device of the fuel cell system according to claim 2, wherein the hydrogen path drainage and exhaust mechanism comprises a hydrogen circulation path water separator (11), a hydrogen path drainage valve (12) and a hydrogen path exhaust valve (13), a hydrogen outlet of the fuel cell stack (8) is connected with the hydrogen circulation path water separator (11), one side of the hydrogen circulation path water separator (11) is respectively connected with the hydrogen path drainage valve (12) and the hydrogen path exhaust valve (13), the other side is connected with a second electromagnetic valve (17) for gas, and the hydrogen path drainage valve (12) and the hydrogen path exhaust valve (13) are connected with an air tail exhaust pipe (10).
4. A fuel cell system stop discharge device according to claim 1, wherein the circulation pump (18) is an electric circulation pump with an adjustable rotation speed.
5. A fuel cell system stop discharge device according to claim 3, wherein an intercooler (5) is provided between the air compressor (4) and the humidifier (6).
6. A shutdown discharge method using the shutdown discharge device of claim 5, the method comprising the steps of:
1) The air enters the fuel cell system through the air filter (1), the air flow meter (2) detects the air flow entering the fuel cell system, and the air compressor (4) compresses the air to the pressure and flow required by the system;
2) Before stopping the discharging process, the air compressor (4) stops working, the air inlet throttle valve (3) and the air back pressure valve (9) are closed at the same time, the first air electromagnetic valve (16) and the second air electromagnetic valve (17) are closed, the third air electromagnetic valve (19) and the fourth air electromagnetic valve (20) are opened, the air path forms a closed space, and the circulating pump (18) is transferred from the hydrogen path to the air path;
3) According to actual requirements, continuously supplementing hydrogen with certain pressure by utilizing a low-pressure hydrogen supply device (15), closing a hydrogen path drain valve (12) and a hydrogen path exhaust valve (13), and setting the rotating speed of a circulating pump (18);
4) Loading a calibrated small current on a bus of the fuel cell stack (8) rapidly, monitoring a current value by a current sensor (22), pulling down the total voltage of the fuel cell stack (8), and starting shutdown discharge;
5) Continuously supplementing hydrogen in a hydrogen gas path, starting a circulating pump (18) to forcibly circulate the air path, circulating air in the fuel cell stack (8), the air compressor (4), the intercooler (5), the humidifier (6) and the pipeline, and rapidly consuming oxygen in the air path;
6) Monitoring the total voltage value of the pile through a voltage sensor (21), triggering the lower limit, and stopping current loading; meanwhile, the oxygen concentration of the air channel is monitored through an oxygen concentration sensor (7) of the air channel, and when the oxygen concentration is reduced to a certain value, the circulating pump (18) and the low-pressure hydrogen supply device (15) are stopped;
7) After the circulation pump (18) stops working, the shutdown discharge stage is finished, hydrogen permeates from the hydrogen path to the air path, and nitrogen in the air path permeates from the air path to the hydrogen path.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910128242.1A CN109687000B (en) | 2019-02-20 | 2019-02-20 | Shutdown discharging device and method for fuel cell system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910128242.1A CN109687000B (en) | 2019-02-20 | 2019-02-20 | Shutdown discharging device and method for fuel cell system |
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| Publication Number | Publication Date |
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| CN109687000A CN109687000A (en) | 2019-04-26 |
| CN109687000B true CN109687000B (en) | 2023-11-03 |
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| CN201910128242.1A Active CN109687000B (en) | 2019-02-20 | 2019-02-20 | Shutdown discharging device and method for fuel cell system |
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| CN110957506B (en) * | 2019-11-25 | 2021-09-10 | 中国第一汽车股份有限公司 | Fuel cell system and standby control method thereof |
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