CN112820901B - Method for solving water flooding problem of hydrogen-oxygen fuel cell in closed environment - Google Patents

Method for solving water flooding problem of hydrogen-oxygen fuel cell in closed environment Download PDF

Info

Publication number
CN112820901B
CN112820901B CN202011615575.6A CN202011615575A CN112820901B CN 112820901 B CN112820901 B CN 112820901B CN 202011615575 A CN202011615575 A CN 202011615575A CN 112820901 B CN112820901 B CN 112820901B
Authority
CN
China
Prior art keywords
fuel cell
hydrogen
voltage
flooding
oxygen
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.)
Active
Application number
CN202011615575.6A
Other languages
Chinese (zh)
Other versions
CN112820901A (en
Inventor
涂正凯
范丽欣
龚骋原
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huazhong University of Science and Technology
Original Assignee
Huazhong University of Science and Technology
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Huazhong University of Science and Technology filed Critical Huazhong University of Science and Technology
Priority to CN202011615575.6A priority Critical patent/CN112820901B/en
Publication of CN112820901A publication Critical patent/CN112820901A/en
Application granted granted Critical
Publication of CN112820901B publication Critical patent/CN112820901B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00Fuel cells; Manufacture thereof
    • H01M8/04Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04082Arrangements for control of reactant parameters, e.g. pressure or concentration
    • H01M8/04089Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants
    • H01M8/04119Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants with simultaneous supply or evacuation of electrolyte; Humidifying or dehumidifying
    • H01M8/04156Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants with simultaneous supply or evacuation of electrolyte; Humidifying or dehumidifying with product water removal
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00Fuel cells; Manufacture thereof
    • H01M8/04Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04082Arrangements for control of reactant parameters, e.g. pressure or concentration
    • H01M8/04089Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants
    • H01M8/04104Regulation of differential pressures
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00Fuel cells; Manufacture thereof
    • H01M8/04Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04082Arrangements for control of reactant parameters, e.g. pressure or concentration
    • H01M8/04089Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants
    • H01M8/04119Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants with simultaneous supply or evacuation of electrolyte; Humidifying or dehumidifying
    • H01M8/04156Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants with simultaneous supply or evacuation of electrolyte; Humidifying or dehumidifying with product water removal
    • H01M8/04179Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants with simultaneous supply or evacuation of electrolyte; Humidifying or dehumidifying with product water removal by purging or increasing flow or pressure of reactants
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00Fuel cells; Manufacture thereof
    • H01M8/04Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04298Processes for controlling fuel cells or fuel cell systems
    • H01M8/04313Processes 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
    • H01M8/04537Electric variables
    • H01M8/04544Voltage
    • H01M8/04552Voltage of the individual fuel cell
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30Hydrogen technology
    • Y02E60/50Fuel cells

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Sustainable Development (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 belongs to the field of fuel cells, and particularly discloses a method for solving the problem of flooding of a hydrogen-oxygen fuel cell in a closed environment. The method specifically comprises the following steps: calculating the monomer voltage deviation proportion and the average voltage deviation proportion in the fuel cell, judging whether all the monomer voltage deviation proportion and the average voltage deviation proportion are smaller than the pulse voltage drop reduction proportion, if so, judging that the state is normal, and if not, entering the next step; replacing a gas supply cylinder with a buffer tank to supply gas to the fuel cell stack, and starting a protection mechanism if the voltage of a monomer or the average voltage is lower than the protection voltage; when any one of the hydrogen buffer pressure and the oxygen buffer pressure is smaller than the buffer pressure, the gas supply cylinder is reused to supply gas for the fuel cell, and water in the fuel cell stack is taken out through pressure difference; the above operations are repeated until the fuel cell is stopped. The invention can early warn the flooding trend of the galvanic pile, reserve regulation and control time for avoiding faults, and carry out water by using the driving force generated by pressure difference, thereby solving the flooding problem of the closed fuel cell and improving the fuel utilization rate.

Description

Method for solving water flooding problem of hydrogen-oxygen fuel cell in closed environment
Technical Field
The invention belongs to the field of fuel cells, and particularly relates to a method for solving the problem of flooding of a hydrogen-oxygen fuel cell in a closed environment.
Background
Proton Exchange Membrane Fuel Cells (PEMFCs) are widely used as power devices for fuel cell vehicles, buses, submarines, unmanned underwater vehicles, and the like, due to their characteristics of high efficiency, high specific power and energy, zero emission, and short operation and starting time at normal temperature. In underwater environments, long closed runs of fuel cells are required. However, during the long-term closing of the stack, liquid water is continuously generated and accumulated in the cell, resulting in flooding of the cell, which directly results in the degradation of the performance and life of the cell, and therefore, good management of water transport is essential to maintain efficient and stable operation of the PEMFC.
The transport of water within the membrane includes processes of electrical drag, reverse osmosis, diffusion, etc., which are considered to be the main mechanisms of water transport within the membrane. Among them, gas humidity, pressure, temperature are the main external factors affecting water transport in the membrane. The percentage of consumption of hydrogen to electrical and thermal energy is called fuel utilization, which is a measure of the degree of hydrogen utilization supplied. A fuel utilization of 100% means that the amount of hydrogen theoretically supplied to the anode is the same as the amount of electrochemical reaction required. However, due to flooding and nitrogen accumulation, there is a fuel starvation at the outlet of the stack due to fuel starvation caused by cell voltage instability and cell degradation, affecting mass transport and accelerating carbon corrosion.
The existing method for solving the problem of flooding is to introduce excessive reaction gas or stop the battery and introduce inert gas for purging to remove water accumulated in the galvanic pile. However, this method causes a problem of waste of reaction gas or delay in operation suspension of the fuel cell.
Disclosure of Invention
In view of the above-mentioned drawbacks and/or needs of the prior art, the present invention provides a method for solving the problem of flooding of hydrogen-oxygen fuel cells in a closed environment, wherein the voltage drop is used as a pre-determination criterion for early flooding faults, so as to accurately warn the flooding trend of a cell stack; meanwhile, the driving force generated by pulse measures is adopted to take out water, so that the problem of flooding of the closed fuel cell is solved, and the fuel utilization rate is improved.
In order to achieve the above object, the present invention provides a method for solving the problem of flooding of hydrogen-oxygen fuel cells in a closed environment, comprising the following steps:
s1 setting protection voltage VpBuffer pressure P1And the pulse voltage drop is reduced by alpha percent, and the initial voltage V of the hydrogen-oxygen fuel cell during stable operation is recorded0Initial cell voltage delta0i(i-1, 2,3 … … n) and initial average voltage
Figure BDA0002874823050000021
n is the number of monocells;
s2 detecting the single voltage V of the hydrogen-oxygen fuel celliAnd calculating an average voltage based thereon
Figure BDA0002874823050000022
Then, the monomer voltage deviation ratios beta are calculated respectively by using the following formulaiAnd average voltage deviation ratioExample (b)
Figure BDA0002874823050000023
Figure BDA0002874823050000024
Figure BDA0002874823050000025
Judging the deviation ratio beta of the cell voltageiProportional to average voltage deviation
Figure BDA0002874823050000026
If all the hydrogen-oxygen fuel cells are smaller than the pulse voltage drop reduction proportion alpha%, judging that the hydrogen-oxygen fuel cells are normal in state without subsequent steps, otherwise, judging that the hydrogen-oxygen fuel cells have a water flooding risk and entering step S3;
s3 the buffer tank is used to replace the gas cylinder to supply gas to the fuel cell stack if the voltage of the single body is ViOr average voltage
Figure BDA0002874823050000027
Below the protective voltage VpIf so, starting a protection mechanism, automatically cutting off the load and switching to nitrogen purging; if the voltage of the cell ViAnd average voltage
Figure BDA0002874823050000028
Are all higher than or equal to the protective voltage VpThen the hydrogen is buffered to the pressure PHPAnd oxygen buffer pressure POPAnd a buffer pressure P1Comparing when any one of the pressure values is less than the buffer pressure P1When the fuel cell is used, the gas supply cylinder is reused for supplying gas to the fuel cell, and water in the fuel cell stack is taken out through pressure difference;
s4 repeats steps S2, S3 until the fuel cell stops, so as to solve the problem of flooding of the hydrogen-oxygen cell in the closed environment by means of pulse.
As a further preference, theProtective voltage Vp0.25-0.35V.
As a further preference, the protective voltage VpIt was 0.3V.
As a further preference, the buffer pressure P1Is 0.2atm or more.
Further preferably, the pulse voltage drop reduction ratio is 2% to 15%.
It is further preferable that the pressure difference generated in step S3 is 0.5atm to 1.0 atm.
Preferably, the electromagnetic valve for controlling the gas supply of the gas cylinder in the hydrogen-oxygen fuel cell is a normally open electromagnetic valve, and the electromagnetic valve for controlling the gas supply of the buffer tank is a normally closed electromagnetic valve.
As a further preference, the fuel cell stack is vertically placed to assist in draining.
Generally, compared with the prior art, the above technical solution conceived by the present invention mainly has the following technical advantages:
1. the method has the advantages that the single voltage of each fuel cell is independently acquired, the voltage drop is used as the standard for pre-judging the early-stage flooding fault, the flooding trend of the galvanic pile can be accurately pre-warned, and the regulation and control time is reserved for avoiding the fault; when the risk of flooding exists, the buffer tank is switched to supply air for a period of time, and then the air supply cylinder is switched to supply air, so that a large pressure difference is generated in the fuel cell stack, and water is taken out by using the driving force generated by the pressure difference, so that the problem of flooding of the closed-end fuel cell is solved, the fuel utilization rate is improved, the flooding fault is effectively avoided, and the excess gas can be utilized, and the method provided by the invention can realize the high-efficiency utilization of the fuel utilization rate of more than 99.97%;
2. particularly, the invention optimizes the values of the set protection voltage, the buffer pressure and the pulse voltage drop reduction ratio, can realize the effective removal of liquid water on the proton exchange membrane and the small-range recovery of the performance of the fuel cell stack under the condition of having the smallest influence on the output stack of the fuel cell stack, and ensures the stable and efficient operation of the fuel cell system.
Drawings
FIG. 1 is a schematic diagram of a control method for addressing hydrogen-oxygen fuel cell flooding in a closed environment constructed in accordance with a preferred embodiment of the present invention;
FIG. 2 is a schematic diagram of a hydrogen-oxygen fuel cell in a preferred embodiment of the present invention, wherein (a) is a schematic diagram of an anode and (b) is a schematic diagram of a cathode.
The same reference numbers will be used throughout the drawings to refer to the same or like elements or structures, wherein:
1-a hydrogen gas supply cylinder, 2-an oxygen gas supply cylinder, 3-a first pressure maintaining valve, 4-a second pressure maintaining valve, 5-a first electromagnetic valve, 6-a second electromagnetic valve, 7-a third electromagnetic valve, 8-a fuel cell stack, 9-a fourth electromagnetic valve, 10-a first buffer tank and 11-a second buffer tank.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 2, the schematic structural diagram of the hydrogen-oxygen fuel cell in the preferred embodiment of the present invention includes a gas supply unit, a pulse unit and a fuel cell stack 8, wherein the gas supply unit includes a hydrogen gas supply gas path and an oxygen gas supply gas path, a hydrogen gas supply cylinder 1 in the hydrogen gas supply gas path is connected to the fuel cell stack 8 through a first pressure maintaining valve 3 and a first electromagnetic valve 5, and an oxygen gas supply cylinder 2 in the oxygen gas supply gas path is connected to the fuel cell stack 8 through a second pressure maintaining valve 4 and a second electromagnetic valve 6; the pulse unit comprises a hydrogen pulse gas path and an oxygen pulse gas path, wherein a first buffer tank 10 in the hydrogen buffer gas path is connected with a hydrogen inlet of the fuel cell stack 8 through a third electromagnetic valve 7, and an air outlet of the fuel cell stack 8 is connected with an air inlet of the first buffer tank 10; the second buffer tank 11 in the oxygen buffer gas path is connected with the oxygen inlet of the fuel cell stack 8 through the fourth electromagnetic valve 9, and the air outlet of the fuel cell stack 8 is connected with the air inlet of the second buffer tank 11.
As shown in fig. 1, an embodiment of the present invention provides a method for solving the problem of flooding of hydrogen-oxygen fuel cells in a closed environment, comprising the following steps:
s1 setting protection voltage VpBuffer pressure P1And the pulse voltage drop is reduced by alpha percent, and the initial voltage V of the hydrogen-oxygen fuel cell during stable operation is recorded0Initial cell voltage delta0i(i-1, 2,3 … … n) and initial average voltage
Figure BDA0002874823050000041
n is the number of monocells;
Figure BDA0002874823050000051
s2 detecting single voltage V of hydrogen-oxygen fuel celliAnd calculating an average voltage based thereon
Figure BDA0002874823050000052
Then, the monomer voltage deviation ratios beta are calculated respectively by using the following formulaiProportional to average voltage deviation
Figure BDA0002874823050000053
Figure BDA0002874823050000054
Figure BDA0002874823050000055
Figure BDA0002874823050000056
Judging the deviation ratio beta of the cell voltageiProportional to average voltage deviation
Figure BDA0002874823050000057
Whether all the voltage drop is less than the pulse voltage drop reduction proportion alpha%, if so, judging that the state of the hydrogen-oxygen fuel cell is normal without subsequent steps; if not, representing that the accumulation of moisture and impurity gas in the system has affected the performance of the fuel cell stack, determining that the hydrogen-oxygen fuel cell has a water flooding risk, and entering step S3;
s3 closing the first solenoid valve 5 and the second solenoid valve 6, opening the third solenoid valve 7 and the fourth solenoid valve 9, using the first buffer tank 10 and the second buffer tank 11 to replace the hydrogen gas supply cylinder 1 and the oxygen gas supply cylinder 2 to supply gas for the fuel cell stack, if the single voltage ViOr average voltage
Figure BDA0002874823050000058
Below the protective voltage VpIf so, starting a protection mechanism, automatically cutting off the load and switching to nitrogen purging; if the voltage of the cell ViAnd average voltage
Figure BDA0002874823050000059
Are all higher than or equal to the protective voltage VpThen the hydrogen gas of the first buffer tank 10 is buffered to pressure PHPAnd the oxygen buffer pressure P of the second buffer tank 11OPAnd a buffer pressure P1Comparing when any one of the pressure values is less than the buffer pressure P1When the fuel cell stack 8 is started, the first electromagnetic valve 5 and the second electromagnetic valve 6 are opened, the third electromagnetic valve 7 and the fourth electromagnetic valve 9 are closed, and the hydrogen gas supply cylinder 1 and the oxygen gas supply cylinder 2 are reused for supplying gas to the fuel cell stack; at this point, the voltage and pressure will rise rapidly and the water on the anode side of the stack will pass through the pressure differential Δ PH=PH-PHPThe generated driving force is greatly carried out, and water at the cathode side in the cell stack passes through the pressure difference delta PO=PO-POPThe generated driving force is largely taken out, where Δ PHIs the anode side pressure difference, PHIs the hydrogen inlet pressure, PHPBuffer pressure for hydrogen, Δ POPressure difference of cathode side, POFor oxygen inlet pressure, POPBuffering the pressure for oxygen;
s4 repeating the stepsS2, S3 and recording the gas supply time of the hydrogen gas supply cylinder 1 and the oxygen gas supply cylinder 2, namely the pulse period TiSimultaneously recording the air supply time of the first buffer tank 10 and the second buffer tank 11, namely the impulse response time TPiI is the number of times of executing the step S3, and the fuel cell is stopped until the cycle number reaches a preset period, so that the problem of flooding of the hydrogen-oxygen cell in the closed environment is solved in a pulse mode;
further, a protective voltage Vp0.25-0.35V, and preferably 0.3V to ensure the safe operation of the hydrogen-oxygen fuel cell. The pressure difference between the buffer pressure and the air inlet pressure is water removal power, the smaller the buffer pressure is, the larger the pressure difference is, the better the water removal effect is, but the too low buffer pressure can cause fuel starvation, so the buffer pressure P1Is 0.2atm or more. The pulse voltage drop is the pressure drop ratio of the voltage before pulse execution relative to the stable operation stage, which represents the attenuation of the accumulation of liquid water and impurity gas to the performance along with the closed operation of the fuel cell stack, and the pulse voltage drop ratio is 2% -15% for ensuring the stable and efficient operation of the fuel cell system.
Further, the first electromagnetic valve 5 and the second electromagnetic valve 6 are normally open type electromagnetic valves, and the third electromagnetic valve 7 and the fourth electromagnetic valve 9 are normally closed type electromagnetic valves; the pressure difference Δ P generated in step S3HAnd Δ POShould be above 0.3atm, and preferably 0.5atm to 1.0 atm.
Further, the fuel cell stack is vertically arranged to assist in water drainage; the first buffer tank 10 and the second buffer tank 11 are preferably acrylic cylinder walls with the pressure resistance of more than 2.5Mpa, and the bottom cover of the stainless steel top cover is a transparent tank body fastened by bolts.
In the method provided by the invention, a humidifier is not required to be arranged at the gas supply unit, the pulse unit can also be provided with a gas-liquid separator, and the outlet of the gas-liquid separator is connected with the inlet of the fuel cell stack, so that the effect of auxiliary drainage can be achieved. The invention provides a control method for monitoring the single state of the fuel cell system, performing combined drainage and improving the fuel utilization rate, which is convenient to realize, and a pulse dewatering method based on voltage monitoring is repeated on the basis of ensuring the stable output of the fuel cell by combining the actual use requirements of the closed fuel cell system of underwater power equipment such as a submarine vehicle, an unmanned ship and the like and the internal structure of a galvanic pile. The method can be realized on a controller in the actual process of actual underwater power equipment, and has the advantages of rapid judgment and good actual application effect.
The technical solution provided by the present invention is further explained below according to specific embodiments.
(1) The fuel cell is stably operated, and a protection voltage V is set00.3V, 10% of the pulse voltage drop rate alpha, and the buffer pressure P1Recording initial voltage V of fuel cell in stable operation00.75V, fuel cell stack hydrogen inlet pressure PH0.8atm and oxygen inlet pressure PO0.8atm, hydrogen buffer pressure PHPAnd oxygen buffer pressure POPVoltage of each cell delta0i(i ═ 1,2,3 … … 10), and average voltage
Figure BDA0002874823050000071
Detecting single voltage V of fuel celliCalculating the average voltage deviation value
Figure BDA0002874823050000072
Due to the fact that
Figure BDA0002874823050000073
The step (2) is carried out when the reduction ratio is equal to the preset reduction ratio alpha%;
(2) the first solenoid valve 5 and the second solenoid valve 6 are closed, the third solenoid valve 7 and the fourth solenoid valve 9 are open, the pulse period T1At 3 hours, the hydrogen buffer pressure PHPDecreasing the pressure to 0.2atm, and entering the step (3);
(3) the first solenoid valve 5 and the second solenoid valve 6 are opened, the third solenoid valve 7 and the fourth solenoid valve 9 are closed, the above-mentioned response actions are carried out simultaneously, TP1Voltage and pressure rise rapidly back to 2 s;
(4) after long-time operation, the steps (2) and (3) are switched for a plurality of times, and the pulse period T is recorded2=2.7h,T3=2.2h,T41.6h and an impulse response time TP2=2.12s,TP3=1.95s,TP3=2.02s。
It will be understood by those skilled in the art that the foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included within the scope of the present invention.

Claims (8)

1. A method for addressing the problem of flooding a hydrogen-oxygen fuel cell in an enclosed environment, the method comprising the steps of:
s1 setting protection voltage VpBuffer pressure P1And the pulse voltage drop is reduced by alpha percent, and the initial voltage V of the hydrogen-oxygen fuel cell during stable operation is recorded0Initial cell voltage delta0i1,2,3
Figure FDA0003525018990000011
n is the number of monocells;
s2 detecting the single voltage V of the hydrogen-oxygen fuel celliAnd calculating an average voltage based thereon
Figure FDA0003525018990000012
Then, the monomer voltage deviation ratios beta are calculated respectively by using the following formulaiProportional to average voltage deviation
Figure FDA0003525018990000013
Figure FDA0003525018990000014
Figure FDA0003525018990000015
Judging the deviation ratio beta of the cell voltageiProportional to average voltage deviation
Figure FDA0003525018990000016
If all the hydrogen-oxygen fuel cells are smaller than the pulse voltage drop reduction proportion alpha%, judging that the hydrogen-oxygen fuel cells are normal in state without subsequent steps, otherwise, judging that the hydrogen-oxygen fuel cells have a water flooding risk and entering step S3;
s3 the buffer tank is used to replace the gas cylinder to supply gas to the fuel cell stack if the voltage of the single body is ViOr average voltage
Figure FDA0003525018990000017
Below the protective voltage VpIf so, starting a protection mechanism, automatically cutting off the load and switching to nitrogen purging; if the voltage of the cell ViAnd average voltage
Figure FDA0003525018990000018
Are all higher than or equal to the protective voltage VpThen the hydrogen is buffered to the pressure PHPAnd oxygen buffer pressure POPAnd a buffer pressure P1Comparing when any one of the pressure values is less than the buffer pressure P1When the fuel cell is used, the gas supply cylinder is reused for supplying gas to the fuel cell, and water in the fuel cell stack is taken out through pressure difference; wherein, the water in the fuel cell stack is brought out through the pressure difference, which specifically comprises the following steps: water passing pressure difference deltap of anode side in cell stackH=PH-PHPThe generated driving force is brought out, and water at the cathode side in the cell stack passes through the pressure difference delta PO=PO-POPThe generated driving force is brought out, whereinHIs the anode side pressure difference, PHAs hydrogen inlet pressure, Δ POPressure difference of cathode side, POThe oxygen inlet pressure;
s4 repeats steps S2, S3 until the fuel cell stops, so as to solve the problem of flooding of the hydrogen-oxygen cell in the closed environment by means of pulse.
2. The method of addressing hydrogen-oxygen fuel cell flooding in an enclosed environment of claim 1, wherein said protection voltage Vp0.25-0.35V.
3. The method of addressing hydrogen-oxygen fuel cell flooding in an enclosed environment of claim 1, wherein said protection voltage VpIt was 0.3V.
4. The method of solving a hydrogen-oxygen fuel cell flooding problem in an enclosed environment of claim 1, wherein said buffer pressure P1Is 0.2atm or more.
5. The method of addressing hydrogen-oxygen fuel cell flooding in an enclosed environment of claim 1, wherein said pulsed voltage drop reduction ratio is between 2% and 15%.
6. The method of solving a water flooding problem with a hydrogen-oxygen fuel cell in a closed environment as claimed in claim 1, wherein the pressure difference generated in step S3 is between 0.5atm and 1.0 atm.
7. The method for solving the problem of flooding of hydrogen-oxygen fuel cells in a closed environment as claimed in claim 1, wherein the solenoid valve for controlling the gas supply of the gas cylinder in the hydrogen-oxygen fuel cell is a normally open solenoid valve, and the solenoid valve for controlling the gas supply of the buffer tank is a normally closed solenoid valve.
8. The method for solving the problem of flooding hydrogen-oxygen fuel cells in an enclosed environment as claimed in any one of claims 1 to 7, wherein said fuel cell stack is vertically disposed to assist in draining water.
CN202011615575.6A 2020-12-31 2020-12-31 Method for solving water flooding problem of hydrogen-oxygen fuel cell in closed environment Active CN112820901B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011615575.6A CN112820901B (en) 2020-12-31 2020-12-31 Method for solving water flooding problem of hydrogen-oxygen fuel cell in closed environment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011615575.6A CN112820901B (en) 2020-12-31 2020-12-31 Method for solving water flooding problem of hydrogen-oxygen fuel cell in closed environment

Publications (2)

Publication Number Publication Date
CN112820901A CN112820901A (en) 2021-05-18
CN112820901B true CN112820901B (en) 2022-04-12

Family

ID=75856402

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011615575.6A Active CN112820901B (en) 2020-12-31 2020-12-31 Method for solving water flooding problem of hydrogen-oxygen fuel cell in closed environment

Country Status (1)

Country Link
CN (1) CN112820901B (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113964351B (en) * 2021-10-08 2023-10-27 北京格睿能源科技有限公司 Pile waterproof flooding method and device based on pressure monitoring and regulation of water reverse osmosis
CN113764703B (en) * 2021-11-09 2022-02-01 北京新研创能科技有限公司 Fuel cell anode pulse discharge control method, device and readable storage medium
CN114976130B (en) * 2022-06-08 2024-08-06 中国第一汽车股份有限公司 Method and system for evaluating health state of vehicle fuel cell system, electronic equipment and storage medium
CN115360387B (en) * 2022-10-20 2023-03-24 佛山市清极能源科技有限公司 Anode water quantity control method of fuel cell system
CN115632141B (en) * 2022-12-22 2023-05-23 潍柴动力股份有限公司 Self-humidification control method for vehicle-mounted fuel cell stack and vehicle

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9166233B2 (en) * 2010-09-09 2015-10-20 Nissan Motor Co., Ltd. Fuel cell system and operating method thereof
WO2015053034A1 (en) * 2013-10-08 2015-04-16 日産自動車株式会社 Fuel cell system and method for controlling fuel cell system
CN109216736B (en) * 2018-09-25 2021-05-11 重庆大学 Fuel cell multi-mode switching anode pressure pulsating water flushing control system
CN109585884B (en) * 2018-12-13 2021-08-06 电子科技大学 Method for online eliminating gas shortage and water flooding of fuel cell
CN111769313B (en) * 2020-06-30 2021-10-08 中国第一汽车股份有限公司 Control method of fuel cell system

Also Published As

Publication number Publication date
CN112820901A (en) 2021-05-18

Similar Documents

Publication Publication Date Title
CN112820901B (en) Method for solving water flooding problem of hydrogen-oxygen fuel cell in closed environment
US7993789B2 (en) Fuel cell system and gas control method
JP5007665B2 (en) Fuel cell system
KR101719674B1 (en) Fuel cell system
JP4492824B2 (en) Fuel cell system
JP6465308B2 (en) Abnormality detection method for pressure sensor and fuel cell system
WO2006054548A1 (en) Fuel cell power generation system, its stopping/safekeeping method and program
CN101521288B (en) Adaptive gain scheduled control for current limitation based on voltage performance of a fuel cell system
WO2009056192A1 (en) System and method of purging fuel cell stacks
US8691460B2 (en) Method of stopping operation of fuel cell system
JP2004253220A (en) Control device of fuel cell vehicle
JP2007184196A (en) Fuel cell system
CN112820902A (en) Zero gas discharge system applied to hydrogen-oxygen fuel cell
CN112820908B (en) Normal shutdown method for hydrogen fuel cell system
JP5433364B2 (en) Fuel cell system
JP6335947B2 (en) Stop control method for fuel cell system
JP2012004138A (en) Fuel cell system
KR20200138475A (en) Restore control system and method of fuel cell
JP7545306B2 (en) Fuel cell system and fuel cell ship
JP6389835B2 (en) Pressure control method during output acceleration of fuel cell system
JP4904719B2 (en) Fuel cell system, control method thereof, and vehicle equipped with the same
JP5485930B2 (en) Control method of fuel cell system
JP2017152174A (en) Stop control method for fuel cell system
JP5513760B2 (en) Method for stopping operation of fuel cell system
JP6861340B2 (en) Fuel cell system and how to operate it

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
GR01 Patent grant
GR01 Patent grant