CN113707919B - Method and system for distinguishing, regulating and controlling internal humidity of fuel cell system stack - Google Patents
Method and system for distinguishing, regulating and controlling internal humidity of fuel cell system stack Download PDFInfo
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- CN113707919B CN113707919B CN202110852162.8A CN202110852162A CN113707919B CN 113707919 B CN113707919 B CN 113707919B CN 202110852162 A CN202110852162 A CN 202110852162A CN 113707919 B CN113707919 B CN 113707919B
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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
- H01M8/04298—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
- H01M8/04828—Humidity; Water content
- H01M8/04835—Humidity; Water content of fuel cell reactants
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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
- H01M8/04298—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
- H01M8/04537—Electric variables
- H01M8/04544—Voltage
- H01M8/04559—Voltage of fuel cell stacks
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention belongs to the technical field of fuel cells, and discloses a method and a system for judging and regulating the internal humidity of a fuel cell system galvanic pile. The method for judging and regulating the internal humidity of the fuel cell system galvanic pile can basically judge the dry and wet conditions in the galvanic pile and make corresponding measures to regulate. The invention mainly aims at about 250 graphite electric piles. The problems that the system durability is reduced, the working performance is influenced and even the residual service life is shortened due to the fact that the existing proton exchange membrane fuel cell is frequently flooded and dried. The invention can more accurately adjust the optimal humidity in the galvanic pile, improve the performance of the galvanic pile and prolong the service life of the galvanic pile.
Description
Technical Field
The invention belongs to the technical field of fuel cells, and particularly relates to a method and a system for judging, regulating and controlling the humidity inside a fuel cell stack of a fuel cell system.
Background
At present, a proton exchange membrane fuel cell is a multi-physical-field coupled nonlinear complex system, wherein a proton exchange membrane has a certain requirement on the humidity of reaction gas, a flooding phenomenon can occur when the humidity is too high, a membrane drying phenomenon can occur when the humidity is too low, the durability of the system can be reduced due to the flooding and membrane drying phenomena frequently occurring in the proton exchange membrane fuel cell, the working performance is affected, and even the remaining life is shortened.
The flooding can reduce the activity of the catalyst layer, accelerate the corrosion of materials and the loss of catalysts, reduce the active area, even cause the accumulation of liquid water in the gas flow channel, cause the unsmooth gas circulation and seriously affect the operation and the performance of the proton exchange membrane fuel cell. Proton conduction in proton exchange membrane fuel cells requires water molecules as carriers, so that the proton conductivity is greatly reduced when the membrane is dry, and the normal operation of the cell is affected.
Through the above analysis, the problems and defects of the prior art are as follows:
(1) The existing proton exchange membrane fuel cell often has the phenomena of water logging and membrane drying, which can cause the durability of the system to be reduced, the working performance to be affected and even the residual service life to be shortened.
(2) The water flooding of the existing proton exchange membrane fuel cell can reduce the activity of a catalyst layer, accelerate the corrosion of materials and the loss of catalysts, reduce the active area, even cause the accumulation of liquid water in a gas flow passage, cause the unsmooth gas circulation and seriously affect the operation and the performance of the proton exchange membrane fuel cell.
(3) In the existing proton exchange membrane fuel cell, water molecules are required for proton conduction to serve as carriers, so that the proton conductivity is greatly reduced when the membrane is dried, and the normal operation of the cell is influenced.
The difficulty in solving the above problems and defects is: when the proton exchange membrane fuel cell runs, the dry and wet conditions inside the galvanic pile can not be visually judged, and then the humidity inside the galvanic pile can not be accurately adjusted.
The significance for solving the problems and the defects is as follows: the optimal humidity in the galvanic pile is more accurately adjusted, the performance of the galvanic pile is improved, and the service life of the galvanic pile is prolonged.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a method and a system for judging, regulating and controlling the internal humidity of a fuel cell system galvanic pile, and particularly relates to a method and a system for judging, regulating and controlling the internal humidity of the galvanic pile of a high-power fuel cell system based on CVM single-chip test voltage.
The invention is realized in this way, a fuel cell system electric pile internal humidity judging and regulating method, the fuel cell system electric pile internal humidity judging and regulating method includes:
and judging the dry and wet condition inside the galvanic pile according to the characteristic of the galvanic pile and the distribution condition of the CVM monolithic test voltage, and adjusting the operation condition of the fuel cell system to adjust the humidity inside the galvanic pile according to the judged dry and wet condition inside the galvanic pile.
Further, the method for judging and regulating the internal humidity of the fuel cell system stack comprises the following steps:
step one, after a system is started, a galvanic pile normally operates;
secondly, loading a galvanic pile to adjust the flow of the reactants and the inlet and outlet pressure of the galvanic pile;
step three, analyzing whether the voltage range delta U of the single chip of the galvanic pile CVM is within an allowable range, if so, returning to the step two; if not, executing step four; Δ U denotes a difference between the highest monolithic voltage and the lowest monolithic voltage of the stack;
step four, when the voltage range delta U of the single cell of the galvanic pile CVM exceeds the allowable range, analyzing the single cells with lower voltage of the single cell of the galvanic pile and the distribution positions of the single cells in the galvanic pile, and if the single cells are only distributed at the inlet and the outlet of the galvanic pile, executing step five; if the performance of the galvanic pile is reduced at a plurality of positions of the galvanic pile or positions far away from the inlet and the outlet of the galvanic pile, executing a step eighteen;
step five, continuously opening a tail gas valve, and purging the anode of the galvanic pile;
analyzing whether the voltage range delta U of a single chip of the galvanic pile CVM is recovered in an allowable range and whether a tail gas valve discharges more water, if so, indicating that the inside of the galvanic pile is flooded and the inside of the galvanic pile is wet; if not, executing step seven;
step seven, analyzing whether the temperature T1 (actual temperature of the galvanic pile water) of the galvanic pile is less than the temperature T2 (optimal temperature of the galvanic pile water) corresponding to the working condition point, and if so, executing the step eight; if not, executing step ten;
step eight, load reduction and temperature rise are carried out, the temperature T1= T2, and the operation is carried out for a period of time T;
analyzing whether the voltage range delta U of a single cell of the galvanic pile CVM is recovered within an allowable range, if so, indicating that more water in the galvanic pile cannot be gasified and discharged due to too low temperature of the galvanic pile, so that the interior of the galvanic pile is wet; if not, executing step ten;
step ten, increasing the hydrogen-air pressure difference delta P entering the pile within an allowable range, and inhibiting water of a cathode in the pile from permeating into an anode to operate for a period of time t; the difference between the hydrogen inlet pressure and the air inlet pressure of the delta P galvanic pile;
step eleven, analyzing whether the voltage range delta U of a single chip of the galvanic pile CVM is recovered within an allowable range, and if so, indicating that the galvanic pile is a partial humidity phenomenon caused by excessive water permeating from a cathode to an anode in the galvanic pile; if not, executing step twelve;
step twelve, increasing the rotating speed of the hydrogen circulating pump, increasing the flow rate of the anode, more fully discharging the water on the anode side, and operating for a period of time t;
analyzing whether the voltage range delta U of a single chip of the CVM of the galvanic pile is recovered within an allowable range, if so, indicating that the galvanic pile is a partial humidity phenomenon caused by the fact that moisture in the galvanic pile cannot be completely discharged due to the slow flow rate of anode gas in the galvanic pile; if not, executing step fourteen;
fourteen, increasing the rotating speed of an air compressor, increasing the flow of a cathode, blowing out excessive water in the galvanic pile, reducing water permeating from the cathode to the anode side of the galvanic pile, and operating for a period of time t;
fifthly, analyzing whether the voltage range delta U of the single CVM of the galvanic pile is recovered within an allowable range, if so, indicating that the galvanic pile is caused by that more water permeates to the anode due to excessive moisture of the cathode in the galvanic pile, so that the phenomenon of partial humidity in the galvanic pile occurs; if not, go to step sixteen;
sixthly, shortening exhaust interval time t1 of the exhaust valve (namely the exhaust valve is opened once every t 1), or prolonging exhaust duration time t2 of the exhaust valve (namely the exhaust valve is opened once every t 2), and operating for a period of time t;
seventhly, gradually recovering the single-chip voltage extreme difference delta U of the CVM of the galvanic pile to be within an allowable range, which indicates that the galvanic pile is a partial humidity phenomenon caused by that accumulated water in the galvanic pile exceeds the water content of a membrane electrode of the galvanic pile due to too long exhaust time of an exhaust valve;
eighteen, analyzing whether the temperature T1 of the galvanic pile is greater than the corresponding temperature T2 of the working condition point, and if so, executing the nineteen step; if not, performing a twenty-one step;
nineteenth, increasing the rotating speed of a cooling fan, improving the heat dissipation capacity of a radiator, reducing the temperature of the galvanic pile to a corresponding temperature, enabling T1= T2, and operating for a period of time T;
step twenty, analyzing whether the voltage range delta U of a single chip of the galvanic pile CVM is recovered in an allowable range, if so, indicating that the galvanic pile is a dry film phenomenon caused by excessive evaporation of water in a membrane electrode of the galvanic pile due to overhigh temperature; if not, executing twenty-one;
twenty one, spraying deionized water to the air pipeline through the outside to increase the humidity of air, so that the air entering the anode of the pile can sufficiently wet the membrane electrode, and running for a period of time t;
twenty-two, the voltage range delta U of the single chip of the galvanic pile CVM can be gradually restored to the allowable range, which indicates the dry film phenomenon caused by insufficient air humidification of the galvanic pile cathode;
and twenty three steps, finishing the humidity adjustment.
Further, the method for judging and regulating the internal humidity of the fuel cell system galvanic pile aims at 250 graphite galvanic piles with the size of 600mm 400mm 200mm.
Another objective of the present invention is to provide a fuel cell system stack internal humidity determining and regulating system using the fuel cell system stack internal humidity determining and regulating method.
Another objective of the present invention is to provide an application of the system for determining and regulating humidity inside a stack of a fuel cell system in a pem fuel cell.
It is a further object of the invention to provide a computer device comprising a memory and a processor, the memory storing a computer program which, when executed by the processor, causes the processor to perform the steps of:
the dry and wet conditions inside the galvanic pile are basically judged according to the analysis of the distribution condition of the CVM monolithic test voltage through the characteristics of the galvanic pile, and the humidity inside the galvanic pile can be quickly adjusted by adjusting the operation condition of the system.
It is another object of the present invention to provide a computer-readable storage medium storing a computer program which, when executed by a processor, causes the processor to perform the steps of:
the dry and wet conditions inside the galvanic pile are basically judged according to the analysis of the distribution condition of the CVM monolithic test voltage through the characteristics of the galvanic pile, and the humidity inside the galvanic pile can be quickly adjusted by adjusting the operation condition of the system.
Another object of the present invention is to provide a computer program product stored on a computer readable medium, which includes a computer readable program for providing a user input interface to apply the fuel cell system stack internal humidity determination and regulation system when the computer program product is executed on an electronic device.
Another object of the present invention is to provide a computer-readable storage medium, which stores instructions that, when executed on a computer, cause the computer to apply the system for determining and regulating humidity inside a fuel cell system stack.
Another objective of the present invention is to provide an information data processing terminal, which is used for implementing the fuel cell system stack internal humidity determination and regulation system.
By combining all the technical schemes, the invention has the advantages and positive effects that: the method for judging and regulating the internal humidity of the fuel cell system galvanic pile can basically judge the dry and wet conditions in the galvanic pile and make corresponding measures to regulate. The invention mainly aims at about 250 graphite electric piles with the size of 600mm 400mm 200mm.
The invention provides a simple and flexible CVM single chip test voltage-based method for judging the internal humidity of a certain galvanic pile and a control method thereof. The invention solves the problems of the existing proton exchange membrane fuel cell that the system durability is reduced, the working performance is influenced and even the residual service life is shortened due to the phenomena of flooding and membrane drying which often occur.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart of a method for determining and regulating humidity inside a stack of a fuel cell system according to an embodiment of the present invention.
Fig. 2 is a diagram of a monolithic inspection voltage bar of the electric pile provided by the embodiment of the invention.
The position of the oval circle in fig. 2 (a) is a position close to the inlet and the outlet of the galvanic pile, and the voltage of the single chip at the position is low, which indicates that the water blocking phenomenon occurs when the humidity of the galvanic pile is too high. FIG. 2 (b) the voltage of a single cell at multiple locations of the stack is low, which illustrates the occurrence of dry film due to low humidity in the stack. The humidity of the galvanic pile is adjusted by adjusting the running conditions of the galvanic pile, and the voltage of the monolithic galvanic pile after adjustment is relatively uniform, as shown in fig. 2 (c).
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
Aiming at the problems in the prior art, the invention provides a method and a system for judging and regulating the internal humidity of a fuel cell system stack, and the invention is described in detail below with reference to the accompanying drawings.
The method for judging and regulating the internal humidity of the fuel cell system stack provided by the embodiment of the invention comprises the following steps: the dry and wet conditions inside the galvanic pile are basically judged according to the analysis of the distribution condition of the CVM monolithic test voltage through the characteristics of the galvanic pile, and the humidity inside the galvanic pile can be quickly adjusted by adjusting the operation condition of the system.
The technical solution of the present invention is further described below with reference to examples.
The invention provides a method for judging the internal humidity of a galvanic pile based on CVM single-chip test voltage, which can basically judge the dry and wet conditions in the galvanic pile and make corresponding measures to adjust.
As shown in fig. 1, the method for determining and regulating internal humidity of a certain stack based on CVM monolithic test voltage according to an embodiment of the present invention includes:
s1, after a system is started, a galvanic pile normally operates;
s2, loading a galvanic pile to adjust the flow of the reactants and the inlet and outlet pressure of the galvanic pile;
s3, analyzing whether the voltage range of a single chip of the galvanic pile CVM is within an allowable range, if so, returning to S2, and if not, performing S4;
s4, when the voltage range of a single cell of the galvanic pile CVM exceeds the allowable range, analyzing the position of the galvanic pile where the single cells are distributed if the voltage of the single cell of the galvanic pile is lower, and if the voltage of the single cell of the galvanic pile is only distributed at the position of an inlet and an outlet of the galvanic pile, carrying out S5; if the performance of the galvanic pile is being reduced when the galvanic pile is distributed at a plurality of positions of the galvanic pile or at positions far away from the inlet and the outlet of the galvanic pile, S23 is carried out;
s5, continuously opening a tail gas valve, and purging the anode of the galvanic pile;
s6, analyzing whether the voltage range delta U of the single chip of the galvanic pile CVM is recovered in an allowable range and whether a tail gas valve discharges more water or not, if so, carrying out S7, and if not, carrying out S8;
s7, indicating that the inside of the galvanic pile is flooded with water and is wet;
s8, analyzing whether the temperature T1 of the galvanic pile is less than the corresponding temperature T2 of the working condition point, and if so, carrying out S9; if not, performing S12;
s9, reducing load and raising temperature to enable the temperature T1= T2, and operating for a period of time T;
s10, analyzing whether the voltage range delta U of the single chip of the galvanic pile CVM is recovered within an allowable range, if so, carrying out S11, and if not, carrying out S12;
s11, the galvanic pile indicates that more water in the galvanic pile cannot be gasified and discharged due to too low temperature of the galvanic pile, so that the interior of the galvanic pile is wet;
s12, increasing the hydrogen-air pressure difference delta P entering the pile within an allowable range, and inhibiting water of a cathode in the pile from permeating into an anode to operate for a period of time t;
s13, analyzing whether the voltage range delta U of the single chip of the galvanic pile CVM is recovered within an allowable range, if so, carrying out S14, and if not, carrying out S15;
s14, the galvanic pile is a partial humidity phenomenon caused by excessive water permeating from the cathode to the anode in the galvanic pile;
s15, increasing the rotating speed of the hydrogen circulating pump, increasing the flow rate of the anode, more fully discharging water on the anode side, and operating for a period of time t;
s16, analyzing whether the voltage range delta U of the single chip of the electric pile CVM is recovered within an allowable range, if so, carrying out S17, and if not, carrying out S18;
s17, the galvanic pile is a partial humidity phenomenon caused by the fact that moisture in the galvanic pile cannot be completely discharged due to the fact that the flow rate of anode gas in the galvanic pile is low;
s18, increasing the rotating speed of an air compressor, increasing the flow of a cathode, blowing out excessive water in the galvanic pile, reducing water permeating from the cathode to the anode side of the galvanic pile, and operating for a period of time t;
s19, analyzing whether the voltage range delta U of the single chip of the galvanic pile CVM is recovered within an allowable range, if so, returning to S20, and if not, performing S21;
s20, the galvanic pile shows that more water permeates into the anode due to excessive moisture of the cathode in the galvanic pile, so that the phenomenon of partial humidity in the galvanic pile occurs;
s21, shortening exhaust interval time t1 of the exhaust valve, or prolonging exhaust duration time t2 of the exhaust valve, and operating for a period of time t;
s22, gradually restoring the voltage range delta U of the single CVM of the galvanic pile to an allowable range, which indicates that the galvanic pile is a partial humidity phenomenon caused by that accumulated water in the galvanic pile exceeds the water content of a membrane electrode of the galvanic pile due to too long exhaust time of an exhaust valve;
s23, analyzing whether the temperature T1 of the galvanic pile is greater than the corresponding temperature T2 of the working condition point, and if so, carrying out S24; if not, go to S27;
s24, increasing the rotating speed of a cooling fan, improving the heat dissipating capacity of a radiator, reducing the temperature of the galvanic pile to a corresponding temperature, enabling T1= T2, and operating for a period of time T;
s25, analyzing whether the voltage range delta U of the single chip of the electric pile CVM is recovered within an allowable range, if so, carrying out S26, and if not, carrying out S27;
s26, explaining that the galvanic pile is a dry film phenomenon caused by excessive evaporation of water in the membrane electrode of the galvanic pile due to overhigh temperature;
s27, spraying deionized water to the air pipeline through the outside to increase the humidity of air, so that the air entering the anode of the pile can sufficiently wet the membrane electrode, and running for a period of time t;
s28, the voltage range delta U of the CVM single chip of the galvanic pile can be gradually restored to the allowable range, which indicates the dry film phenomenon caused by insufficient air humidification of the cathode of the galvanic pile;
and S29, finishing the humidity adjustment.
The invention mainly aims at about 250 graphite electric piles with the size of 600mm 400mm 200mm.
The invention provides a simple and flexible CVM single chip test voltage-based method for judging the internal humidity of a certain galvanic pile and a control method thereof.
Fig. 2 is a diagram of a single-chip routing inspection voltage column of the electric pile.
The position of the oval circle in fig. 2 (a) is a position close to the inlet and the outlet of the galvanic pile, and the voltage of a single chip at the position is lower, which indicates that the water plugging phenomenon occurs when the humidity of the galvanic pile is too high.
FIG. 2 (b) the voltage of a single cell at multiple locations of the stack is low, which illustrates the occurrence of dry film due to low humidity in the stack.
The humidity of the galvanic pile is adjusted by adjusting the running conditions of the galvanic pile, and the voltage of the monolithic galvanic pile after adjustment is relatively uniform, as shown in fig. 2 (c).
In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and to simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When used in whole or in part, can be implemented in a computer program product that includes one or more computer instructions. When the computer program instructions are loaded or executed on a computer, the procedures or functions according to the embodiments of the present invention are wholly or partially generated. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wire (e.g., coaxial cable, fiber optic, digital Subscriber Line (DSL), or wireless (e.g., infrared, wireless, microwave, etc.)). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that includes one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid State Disk (SSD)), among others.
The above description is only for the purpose of illustrating the present invention and the appended claims are not to be construed as limiting the scope of the invention, which is intended to cover all modifications, equivalents and improvements that are within the spirit and scope of the invention as defined by the appended claims.
Claims (4)
1. A method for judging and regulating the internal humidity of a fuel cell system electric pile is characterized by comprising the following steps:
judging the dry and wet condition inside the galvanic pile according to the distribution condition of the CVM monolithic test voltage through the characteristics of the galvanic pile, and adjusting the operation condition of a fuel cell system to adjust the humidity inside the galvanic pile according to the judged dry and wet condition inside the galvanic pile;
the method for judging, regulating and controlling the internal humidity of the fuel cell system stack comprises the following steps:
step one, after a system is started, a galvanic pile normally operates;
secondly, loading a galvanic pile to adjust the flow of the reactants and the inlet and outlet pressure of the galvanic pile;
step three, analyzing whether the voltage range delta U of the single chip of the galvanic pile CVM is within an allowable range, and if so, returning to the step two; if not, executing step four;
step four, when the voltage range delta U of the single cell of the electric pile CVM exceeds the allowable range, analyzing the distribution position of the single cell with lower voltage of the single cell of the electric pile in the electric pile, and if the single cell is only distributed at the positions of the inlets and the outlets at the two ends of the electric pile, executing step five; if the performance of the galvanic pile is reduced at a plurality of positions of the galvanic pile or at positions far away from the inlet and the outlet of the galvanic pile, executing a step eighteen;
continuously opening a tail gas valve, and purging the anode of the galvanic pile;
analyzing whether the voltage range delta U of a single chip of the galvanic pile CVM is recovered in an allowable range and whether a tail gas valve discharges more water, if so, indicating that the inside of the galvanic pile is flooded and the inside of the galvanic pile is wet; if not, executing step seven;
step seven, analyzing whether the temperature T1 of the galvanic pile is less than the corresponding temperature T2 of the working point, if so, executing step eight; if not, executing step ten;
step eight, reducing the load and raising the temperature to enable the temperature T1 to rise to T2, and operating for a period of time T;
analyzing whether the voltage range delta U of a single cell of the galvanic pile CVM is recovered within an allowable range, if so, indicating that more water in the galvanic pile cannot be gasified and discharged due to too low temperature of the galvanic pile, so that the interior of the galvanic pile is wet; if not, executing step ten;
step ten, increasing the difference delta P between the gas pressure of the anode side and the gas pressure of the cathode side entering the pile within an allowable range, and inhibiting water of the cathode in the pile from permeating into the anode and running for a period of time t;
step eleven, analyzing whether the voltage range delta U of a single chip of the galvanic pile CVM is recovered within an allowable range, and if so, indicating that the galvanic pile is a partial humidity phenomenon caused by excessive water permeating from a cathode to an anode in the galvanic pile; if not, executing step twelve;
step twelve, increasing the rotating speed of the hydrogen circulating pump, increasing the flow rate of the anode, more fully discharging the water on the anode side, and operating for a period of time t;
step thirteen, analyzing whether the voltage range delta U of a single chip of the galvanic pile CVM is recovered in an allowable range, if so, indicating that the galvanic pile is a partial humidity phenomenon caused by the fact that the moisture in the galvanic pile cannot be completely discharged due to the slow flow rate of anode gas in the galvanic pile; if not, executing step fourteen;
fourteen, increasing the rotating speed of an air compressor, increasing the cathode flow to purge excessive moisture in the galvanic pile, reducing water permeating from the cathode of the galvanic pile to the anode side, and operating for a period of time t;
fifthly, analyzing whether the voltage range delta U of the single CVM of the galvanic pile is recovered within an allowable range, if so, indicating that the galvanic pile is caused by that more water permeates to the anode due to excessive moisture of the cathode in the galvanic pile, so that the phenomenon of partial humidity in the galvanic pile occurs; if not, go to step sixteen;
sixthly, shortening exhaust interval time t1 of the exhaust valve, or prolonging exhaust duration time t2 of the exhaust valve, and operating for a period of time t;
seventhly, gradually restoring the voltage range delta U of the single chip of the galvanic pile CVM to an allowable range, which indicates that the galvanic pile is a partial humidity phenomenon caused by that accumulated water in the galvanic pile exceeds the water content of a galvanic pile membrane electrode due to too long exhaust interval time of a tail gas valve;
eighteen, analyzing whether the temperature T1 of the galvanic pile is greater than the corresponding temperature T2 of the working condition point, and if so, executing the nineteen step; if not, executing twenty-one;
nineteen, increasing the rotating speed of a cooling fan, improving the heat dissipation capacity of a radiator, reducing the temperature T1 of the galvanic pile to T2, and operating for a period of time T;
step twenty, analyzing whether the voltage range delta U of a single chip of the galvanic pile CVM is recovered in an allowable range, if so, indicating that the galvanic pile is a dry film phenomenon caused by excessive evaporation of water in a membrane electrode of the galvanic pile due to overhigh temperature; if not, executing twenty-one;
twenty one, spraying deionized water to the air pipeline through the outside to increase the humidity of air, so that the air entering the cathode of the pile can sufficiently wet the membrane electrode, and running for a period of time t;
twenty-two steps, the voltage range delta U of the single CVM of the galvanic pile is gradually restored to the allowable range, which indicates the dry film phenomenon caused by insufficient air humidification of the cathode of the galvanic pile;
twenty-three, finishing the humidity adjustment;
the method for judging and regulating the internal humidity of the fuel cell system galvanic pile aims at 250 graphite galvanic piles with the size of 600mm 400mm 200mm.
2. A fuel cell system stack internal humidity discriminating and regulating system applying the fuel cell system stack internal humidity discriminating and regulating method according to claim 1.
3. An application of the humidity determination and control system in the fuel cell system stack of claim 2 in a proton exchange membrane fuel cell.
4. An information data processing terminal, wherein the information data processing terminal is used for the fuel cell system stack internal humidity judging and regulating system according to claim 2.
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