CN113497258B - Shutdown control method and device for fuel cell system - Google Patents
Shutdown control method and device for fuel cell system Download PDFInfo
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- CN113497258B CN113497258B CN202010259385.9A CN202010259385A CN113497258B CN 113497258 B CN113497258 B CN 113497258B CN 202010259385 A CN202010259385 A CN 202010259385A CN 113497258 B CN113497258 B CN 113497258B
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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
- H01M8/043—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
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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
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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
- H01M8/04746—Pressure; Flow
- H01M8/04753—Pressure; Flow of fuel cell reactants
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The application relates to a shutdown control method, a shutdown control device, computer equipment and a storage medium of a fuel cell system, wherein the method comprises the following steps: under the condition that a fuel cell system is shut down, an air path and a hydrogen path of the electric pile are opened, and air and hydrogen are continuously and respectively supplied to the electric pile; closing an air path of the galvanic pile, and opening an air bypass so that air cannot flow into the galvanic pile; switching on an output circuit connected in parallel with the galvanic pile to enable hydrogen in the galvanic pile to react with oxygen in the air so as to consume the oxygen in the galvanic pile and simultaneously perform hydrogen purging operation; when the oxygen is consumed, the output circuit is disconnected; the hydrogen path and air bypass are closed. The method can realize the effects of keeping the interior of the galvanic pile in a reducing environment after shutdown, avoiding potential safety hazards, improving cold start performance and prolonging the service life of the galvanic pile.
Description
Technical Field
The present application relates to the field of new energy technologies, and in particular, to a method and an apparatus for controlling shutdown of a fuel cell system, a computer device, and a storage medium.
Background
The proton exchange membrane fuel cell has the working principle that hydrogen and oxygen generate electrochemical reaction to generate water and output electric energy at the same time. Because the voltage of the fuel cell is usually less than 1V, in practical application, hundreds of single cells need to be connected in series to form a fuel cell stack and matched with corresponding peripheral accessories to form a fuel cell system.
When a fuel cell system is shut down, in order to discharge water vapor, liquid water and the like inside a stack, purging operation is generally adopted; meanwhile, in order to consume oxygen as much as possible when the galvanic pile is shut down, the reduction environment is ensured to exist in the galvanic pile when the galvanic pile is placed in the shutdown state, oxygen permeated from the outside is continuously consumed, the hydrogen-oxygen interface is prevented from appearing when the galvanic pile is started next time, and the resistance discharge operation is usually adopted after the purging operation.
In the stage of oxygen consumption by the resistor, if the hydrogen side tail discharge valve is kept open, the hydrogen concentration of the tail discharge port of the system exceeds a safety threshold value, and safety risks are caused; however, if the hydrogen side exhaust valve is kept not to be opened, impurities such as water vapor inside the galvanic pile in the consumption stage and nitrogen gas remaining after air reaction cannot be sufficiently discharged, so that the amount of hydrogen remaining inside the galvanic pile is low, oxygen permeating from the outside cannot be sufficiently consumed, long-time sealing and standing of the galvanic pile is not facilitated, a hydrogen-oxygen interface possibly occurs during next starting, the service life of the galvanic pile is influenced, and the remaining water vapor may be frozen in a low-temperature environment and is not beneficial to cold start operation.
Disclosure of Invention
In view of the foregoing, it is desirable to provide a shutdown control method, apparatus, computer device and storage medium for a fuel cell system, which can restore the internal environment of a stack after shutdown of the fuel cell system, avoid potential safety hazards, improve cold start performance and prolong the life of the stack.
A shutdown control method of a fuel cell system, the method comprising:
under the condition that a fuel cell system is shut down, an air path and a hydrogen path of the electric pile are opened, and air and hydrogen are continuously and respectively supplied to the electric pile;
closing an air path of the galvanic pile, and opening an air bypass so that air cannot flow into the galvanic pile;
switching on an output circuit connected in parallel with the galvanic pile to enable hydrogen in the galvanic pile to react with oxygen in the air so as to consume the oxygen in the galvanic pile and simultaneously perform hydrogen purging operation;
when the oxygen is consumed, the output circuit is disconnected;
the hydrogen path and air bypass are closed.
In one embodiment, the opening of the air path and the hydrogen path of the stack includes:
and opening an air compressor, a distribution valve and a pressure regulating valve which are arranged on the air path, and opening a hydrogen circulating pump, a control valve and a purging electromagnetic valve which are arranged on the hydrogen path.
In one embodiment, the closing the air path of the stack and the opening the air bypass includes:
the pressure regulating valve arranged on the air path is closed, and the distributing valve is regulated to make the air directly flow into the mixing cavity through the air bypass.
In one embodiment, the simultaneously performing the hydrogen purging operation includes:
and opening a purging electromagnetic valve according to a preset frequency to purge the water vapor, the nitrogen and the hydrogen on the hydrogen side of the galvanic pile into the mixing cavity.
In an embodiment, the method further comprises:
the air in the mixing chamber dilutes the hydrogen below a preset threshold and then vents to atmosphere.
In one embodiment, the disconnection output circuit includes:
and under the condition that the voltage of the single sheet of the electric pile is less than the preset voltage, the output circuit is disconnected.
In one embodiment, the closing the hydrogen path and the air bypass comprises:
and closing an air compressor arranged on the air path, and setting a hydrogen circulating pump, a control valve and a purging electromagnetic valve in the hydrogen path.
In one embodiment, the air compressor that sets up on the air way is closed to and set up hydrogen circulating pump, control valve and the purge solenoid valve in hydrogen gas circuit include:
if the hydrogen purge operation is performed before the circulation pump is turned off, the purge solenoid valve is turned off first or both the hydrogen circulation pump and the purge solenoid valve are turned off at the same time.
In one embodiment, the air compressor machine that sets up on the air way is closed to and set up hydrogen circulating pump, control valve and the purge solenoid valve in hydrogen gas circuit still include:
closing the hydrogen circulating pump;
closing the purging electromagnetic valve after the hydrogen purging operation is performed for the preset times;
the control valve is opened to stop the supply of hydrogen gas;
the air compressor is turned off.
A shutdown control apparatus of a fuel cell system, the apparatus comprising:
the supply module is used for opening an air circuit and a hydrogen circuit of the electric pile under the condition that the fuel cell system is shut down, and continuously supplying air and hydrogen to the electric pile respectively;
the first closing module is used for closing an air path of the galvanic pile and opening an air bypass so that air cannot flow into the galvanic pile;
the oxygen consumption module is used for switching on an output circuit connected with the galvanic pile in parallel and simultaneously executing hydrogen purging operation to enable hydrogen in the galvanic pile to react with oxygen in the air so as to consume the oxygen in the galvanic pile;
the circuit breaking module is used for breaking the output circuit when the oxygen is consumed completely;
and the second closing module is used for closing the hydrogen path and the air bypass.
A computer device comprising a memory storing a computer program and a processor implementing the steps of the method as claimed in any one of the above when the computer program is executed.
A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of the preceding claims.
The shutdown control method, the shutdown control device, the computer equipment and the storage medium of the fuel cell system comprise the following steps: under the condition that the fuel cell system is shut down, opening an air path and a hydrogen path of the electric pile, and continuously supplying air and hydrogen to the electric pile respectively; closing an air path of the galvanic pile, and opening an air bypass so that air cannot flow into the galvanic pile; switching on an output circuit connected in parallel with the galvanic pile to enable hydrogen in the galvanic pile to react with oxygen in the air so as to consume the oxygen in the galvanic pile and simultaneously perform hydrogen purging operation; when the oxygen is completely consumed, the output circuit is disconnected; the hydrogen path and air bypass are closed. The method can realize the effects of keeping the interior of the galvanic pile in a reducing environment after shutdown, avoiding potential safety hazards, improving cold start performance and prolonging the service life of the galvanic pile.
Drawings
Fig. 1 is a schematic structural diagram of an application environment of a shutdown control method of a fuel cell system in one embodiment;
fig. 2 is a schematic flow chart of a shutdown control method of a fuel cell system in one embodiment;
fig. 3 is a flowchart illustrating a shutdown control method of a fuel cell system in another embodiment;
FIG. 4 is a schematic structural view of a fuel cell system according to an embodiment;
fig. 5 is a block diagram showing a configuration of a stop control device of a fuel cell system in one embodiment;
FIG. 6 is a diagram illustrating an internal structure of a computer device according to an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more clearly understood, the present application is further described in 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 present application and are not intended to limit the present application.
The shutdown control method of the fuel cell system can be applied to the application environment shown in fig. 1. Wherein the fuel cell system 102 communicates with the server 104 via a network. Under the condition that the fuel cell system 102 is shut down, the server 104 sequentially opens an air path and a hydrogen path of the stack and continuously supplies air and hydrogen to the stack respectively; closing an air path of the galvanic pile, and opening an air bypass so that air cannot flow into the galvanic pile; switching on an output circuit connected with the galvanic pile in parallel, and simultaneously executing hydrogen purging operation to enable hydrogen in the galvanic pile to react with oxygen in the air so as to consume the oxygen in the galvanic pile; when the oxygen is consumed, the output circuit is disconnected; the hydrogen path and air bypass are closed. The server 104 may be implemented as a stand-alone server or as a server cluster comprised of multiple servers.
In one embodiment, as shown in fig. 2, a shutdown control method of a fuel cell system is provided, which is described by taking the method as an example applied to the server 104 in fig. 1, and includes the following steps:
step S110: under the condition that the fuel cell system is shut down, opening an air path and a hydrogen path of the electric pile, and continuously supplying air and hydrogen to the electric pile respectively;
step S210: closing an air path of the galvanic pile, and opening an air bypass so that air cannot flow into the galvanic pile;
step S310: switching on an output circuit connected in parallel with the galvanic pile to enable hydrogen in the galvanic pile to react with oxygen in the air so as to consume the oxygen in the galvanic pile and simultaneously perform hydrogen purging operation;
step S410: when the oxygen is completely consumed, the output circuit is disconnected;
step S510: the hydrogen path and air bypass are closed.
In one embodiment, the step S110 includes:
step S1101: and opening an air compressor, a distribution valve and a pressure regulating valve which are arranged on the air path, and opening a hydrogen circulating pump, a control valve and a purging electromagnetic valve which are arranged on the hydrogen path.
In one embodiment, the step S210 includes:
step S2101: the pressure regulating valve arranged on the air path is closed, and the distributing valve is regulated to make the air directly flow into the mixing cavity through the air bypass.
In one embodiment, the step S310 includes:
step S3101: and opening a purging electromagnetic valve according to a preset frequency, and mixing the water vapor, the nitrogen and the hydrogen on the hydrogen side of the galvanic pile into the mixing cavity.
In an embodiment, the method further comprises:
step S3101 a: the air in the mixing chamber dilutes the hydrogen below a preset threshold and then vents to atmosphere.
In one embodiment, the step S410 includes:
step S4101: and under the condition that the voltage of the single sheet of the electric pile is less than the preset voltage, the output circuit is disconnected.
In one embodiment, the step S510 includes:
step S5101: and closing an air compressor arranged on the air path, and setting a hydrogen circulating pump, a control valve and a purging electromagnetic valve in the hydrogen path.
In one embodiment, the step S5101 includes:
step S5101 a: if the hydrogen purge operation is performed before the circulation pump is turned off, the purge solenoid valve is turned off first or both the hydrogen circulation pump and the purge solenoid valve are turned off at the same time.
In an embodiment, the step S5101 further includes:
step S5101 b: closing the hydrogen circulating pump;
step S5101 c: closing the purging electromagnetic valve after the hydrogen purging operation is performed for the preset times;
step S5101 d: the control valve is turned off to stop the supply of hydrogen gas;
step S5101 e: the air compressor is turned off.
Referring to fig. 3 and 4, the shutdown control method of the fuel cell system according to the present application will be specifically described below with reference to fig. 3 and 4.
As shown in the figure, the configuration diagram of a typical fuel cell system is shown, wherein 1 is a stack hydrogen side inlet control valve, 2 is a hydrogen circulation pump, 3 is a hydrogen side outlet purge solenoid valve, 4 is a fuel cell stack, 5 is a tail mixing chamber, 6 is a stack air side outlet pressure regulating valve, 7 is a stack air side inlet distribution valve, and 8 is an air compressor. Specifically, the configuration comprises an air flow path for air entering the stack and a bypass flow path not passing through the stack; specifically, in this configuration, the air off-gas and the hydrogen off-gas are mixed in the mixing chamber and then discharged to the atmosphere.
The specific embodiment is as follows:
s01: the fuel cell system is shut down.
S02: a fuel cell system purge operation is performed to purge water vapor, liquid water, and the like inside the stack 4 by continuously supplying air and hydrogen to the stack 4. Specifically, the air compressor 8, the distribution valve 7 and the pressure regulating valve 6 are opened, the control valve 1 and the hydrogen circulating pump 2 are opened, and the purging electromagnetic valve 3 operates at a certain frequency; however, it should be noted that sometimes purging operations may not be undertaken; directly transferring to S03;
s03: the air path is bypassed. Specifically, an inlet channel of the electric pile 4 is closed by adjusting an air side inlet distribution valve 7 of the electric pile 4, a bypass loop is opened, air directly flows into the mixing cavity 5 without passing through the electric pile 4, and an air side outlet pressure regulating valve 6 of the electric pile 4 is closed to prevent the air from flowing back into the electric pile 4.
S04: an oxygen consuming operation is performed. Specifically, the inlet and outlet of the air side of the galvanic pile 4 are kept closed, hydrogen on the hydrogen side is continuously supplied, and an output circuit is switched on, so that the hydrogen and the oxygen continuously react to consume the residual oxygen; simultaneously performing a hydrogen side purge operation (intermittently opening a hydrogen side outlet purge solenoid valve, e.g., opening and closing at a certain period and duty cycle), discharging water vapor, nitrogen, hydrogen, and the like into the mixing chamber 5, and discharging the hydrogen diluted by the bypassed air in the mixing chamber 5 to the atmosphere after being below a safety threshold, preferably, the hydrogen purge operation may not be performed at this stage; the hydrogen circulating pump 2 is operated, specifically, in the oxygen consumption process, the hydrogen circulating pump 2 may not be operated, but it is preferable to operate the hydrogen circulating pump 2 and set different rotating speeds of the hydrogen circulating pump 2 according to actual conditions; specifically, the hydrogen supply control valve 1 may be a mechanical pressure regulating valve, a hydrogen jet or a hydrogen ejector, or the like.
S05: after sufficient consumption of oxygen, the output circuit is turned off. Specifically, the time for turning off the output circuit may be determined according to the average monolithic voltage of the stack 4, specifically, for example, when the average monolithic voltage is less than 0.4V, the output circuit is turned off; more specifically, the output circuit may be a resistor connected between the positive and negative electrodes of the stack 4 to bypass the resistor, and may be a device having an active regulation function such as DCDC to consume oxygen by passing current through the resistor.
S06: and closing the air path and the hydrogen path. Specifically, the hydrogen circulation pump 2 is closed, the purging operation of the hydrogen side outlet purging electromagnetic valve 3 is stopped, the hydrogen supply control valve 1 is closed, the air compressor 8 is closed again, and the position of the distribution valve 7 is kept unchanged; specifically, if the hydrogen purge solenoid valve 3 performs the purge operation before the hydrogen circulation pump 2 is turned off, the hydrogen purge solenoid valve 3 may be stopped before or simultaneously with the turning off of the hydrogen circulation pump 2; preferably, however, the hydrogen circulation pump 2 is first turned off in order, the purge solenoid valve 3 is turned off after a preset number of hydrogen purge operations are performed, the hydrogen supply is cut off, and finally the air compressor 8 is turned off. Wherein, optionally, the function of the distributing valve 7 can be realized by placing different pressure regulating valves in the pile inlet loop and the bypass loop. Alternatively, the structure may not include the hydrogen circulation pump 2, or an ejector may be used instead of the hydrogen circulation pump 2.
S07: and (6) ending.
The shutdown control method of a fuel cell system described above, the method comprising: under the condition that the fuel cell system is shut down, opening an air path and a hydrogen path of the electric pile, and continuously supplying air and hydrogen to the electric pile respectively; closing an air path of the galvanic pile, and opening an air bypass so that air cannot flow into the galvanic pile; switching on an output circuit connected in parallel with the galvanic pile to enable hydrogen in the galvanic pile to react with oxygen in the air so as to consume the oxygen in the galvanic pile and simultaneously perform hydrogen purging operation; when the oxygen is completely consumed, the output circuit is disconnected; the hydrogen path and air bypass are closed. The method can realize the effects of reducing the internal environment of the galvanic pile, avoiding potential safety hazard, improving cold start performance and prolonging the service life of the galvanic pile.
It should be understood that although the steps in the flowcharts of fig. 2 and 3 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a portion of the steps in fig. 2 may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performance of the sub-steps or stages is not necessarily sequential, but may be performed in turn or alternately with other steps or at least a portion of the sub-steps or stages of other steps.
In one embodiment, as shown in fig. 5, there is provided a shutdown control apparatus of a fuel cell system, including:
a supply module 810, configured to open an air path and a hydrogen path of the stack and continuously supply air and hydrogen to the stack, respectively, when the fuel cell system is shut down;
a first closing module 820, configured to close an air path of the stack and open an air bypass, so that air cannot flow into the stack;
the oxygen consumption module 830 is used for connecting an output circuit connected in parallel with the galvanic pile, so that hydrogen in the galvanic pile reacts with oxygen in the air to consume the oxygen in the galvanic pile and perform hydrogen purging operation;
a circuit breaking module 840 for breaking the output circuit when the oxygen is depleted;
a second shutdown module 850 for shutting down the hydrogen path and the air bypass.
In one embodiment, the supply module 810 includes:
and the gas inflow module 8101 is used for opening an air compressor, a distribution valve and a pressure regulating valve which are arranged on the air path, and opening a hydrogen circulating pump, a control valve and a purging electromagnetic valve which are arranged on the hydrogen path.
In one embodiment, the first shutdown module 820 includes:
and the air path closing module 8201 is used for closing a pressure regulating valve arranged on the air path, and regulating a distribution valve to enable air to directly flow into the mixing cavity through an air bypass.
In one embodiment, the oxygen consumption module 830 comprises:
and the gas mixing module 8301 is used for opening the purging electromagnetic valve according to the preset frequency to purge the water vapor, the nitrogen and the hydrogen on the hydrogen side of the galvanic pile into the mixing cavity.
In an embodiment, the method further comprises:
and a gas exhaust module 8301a used for exhausting the hydrogen gas diluted by the air in the mixing cavity below a preset threshold to the atmosphere.
In one embodiment, the circuit breaking module 840 includes:
and the voltage comparison module 8401 is used for disconnecting the output circuit under the condition that the voltage of the single cell of the galvanic pile is less than the preset voltage.
In one embodiment, the second shutdown module 850 includes:
and a third closing module 8501 for closing the air compressor arranged on the air path, and the hydrogen circulating pump, the control valve and the purging electromagnetic valve arranged on the hydrogen path.
In an embodiment, the third closing module 8501 includes:
a first executing module 8501b for closing the purge solenoid valve first or closing both the hydrogen circulation pump and the purge solenoid valve if the hydrogen purge operation has been performed before the circulation pump is closed.
In an embodiment, the third closing module 8501 further includes:
a fourth shutdown module 8501c for shutting down the hydrogen circulation pump;
the judgment module 8501d is used for closing the purging electromagnetic valve after the hydrogen purging operation is executed for the preset times;
a disconnect module 8501e for disconnecting the control valve to stop the hydrogen supply;
a fifth shutdown module 8501f to shut down the air compressor.
The specific definition of the shutdown control device for a fuel cell system can be referred to the above definition of the shutdown control method for a fuel cell system, and is not described in detail here. Each module in the shutdown control apparatus of the fuel cell system described above may be implemented in whole or in part by software, hardware, and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be as shown in fig. 6. The computer device includes a processor, a memory, a network interface, and a database connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The database of the computer device is used for storing fuel cell system related data. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to implement a shutdown control method of a fuel cell system.
It will be appreciated by those skilled in the art that the configuration shown in fig. 6 is a block diagram of only a portion of the configuration associated with the present application, and is not intended to limit the computing device to which the present application may be applied, and that a particular computing device may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.
In one embodiment, a computer device is provided, comprising a memory having a computer program stored therein and a processor that when executing the computer program performs the steps of:
under the condition that the fuel cell system is shut down, opening an air path and a hydrogen path of the electric pile, and continuously supplying air and hydrogen to the electric pile respectively;
closing an air path of the galvanic pile, and opening an air bypass so that air cannot flow into the galvanic pile;
connecting an output circuit connected with the galvanic pile in parallel to enable hydrogen in the galvanic pile to react with oxygen in the air so as to consume the oxygen in the galvanic pile and simultaneously execute hydrogen purging operation;
when the oxygen is completely consumed, the output circuit is disconnected;
the hydrogen path and air bypass are closed.
In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored which, when executed by a processor, performs the steps of:
under the condition that a fuel cell system is shut down, an air path and a hydrogen path of the electric pile are opened, and air and hydrogen are continuously and respectively supplied to the electric pile;
closing an air path of the galvanic pile, and opening an air bypass so that air cannot flow into the galvanic pile;
switching on an output circuit connected in parallel with the galvanic pile to enable hydrogen in the galvanic pile to react with oxygen in the air so as to consume the oxygen in the galvanic pile and simultaneously perform hydrogen purging operation;
when the oxygen is consumed, the output circuit is disconnected;
the hydrogen path and air bypass are closed.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above may be implemented by hardware instructions of a computer program, which may be stored in a non-volatile computer-readable storage medium, and when executed, may include the processes of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent application shall be subject to the appended claims.
Claims (10)
1. A shutdown control method of a fuel cell system, characterized by comprising:
under the condition that the fuel cell system is shut down, opening an air path and a hydrogen path of the electric pile, and continuously supplying air and hydrogen to the electric pile respectively;
closing an air path of the galvanic pile, and opening an air bypass so that air cannot flow into the galvanic pile;
switching on an output circuit connected in parallel with the galvanic pile to enable hydrogen in the galvanic pile to react with oxygen in the air so as to consume the oxygen in the galvanic pile and simultaneously perform hydrogen purging operation;
when the oxygen is completely consumed, the output circuit is disconnected;
closing the hydrogen gas path and the air bypass;
wherein, open the air way and the hydrogen way of galvanic pile and include:
opening an air compressor, a distribution valve and a pressure regulating valve which are arranged on an air path, and opening a hydrogen circulating pump, a control valve and a purging electromagnetic valve which are arranged on a hydrogen path;
wherein the simultaneously performing the hydrogen purging operation includes:
and opening a purging electromagnetic valve according to a preset frequency to purge the water vapor, the nitrogen and the hydrogen on the hydrogen side of the galvanic pile into the mixing cavity.
2. The method of claim 1, wherein the closing an air path of the stack and opening an air bypass comprises:
the pressure regulating valve arranged on the air path is closed, and the distributing valve is regulated to make the air directly flow into the mixing cavity through the air bypass.
3. The method according to claim 1 or 2, characterized in that the method further comprises:
the air in the mixing chamber dilutes the hydrogen below a preset threshold and then vents to atmosphere.
4. The method of claim 3, wherein the disconnecting the output circuit comprises: and under the condition that the voltage of the single sheet of the electric pile is less than the preset voltage, the output circuit is disconnected.
5. The method of claim 4, wherein the closing the hydrogen gas path and the air bypass path comprises: and closing an air compressor arranged on the air path, and setting a hydrogen circulating pump, a control valve and a purging electromagnetic valve in the hydrogen path.
6. The method of claim 5, wherein the shutting down an air compressor disposed on the air path, and a hydrogen circulation pump, a control valve, and a purge solenoid valve disposed on the hydrogen path comprises:
if the hydrogen purging operation is performed before the hydrogen circulation pump is turned off, the purge solenoid valve is turned off first or both the hydrogen circulation pump and the purge solenoid valve are turned off at the same time.
7. The method of claim 6, wherein the shutting down an air compressor disposed on the air path, and a hydrogen circulation pump, a control valve, and a purge solenoid valve disposed on the hydrogen path further comprises:
closing the hydrogen circulating pump;
closing the purging electromagnetic valve after the hydrogen purging operation is performed for the preset times; the control valve is turned off to stop the supply of hydrogen gas;
the air compressor is turned off.
8. A stop control device of a fuel cell system for implementing the stop control method according to any one of claims 1 to 7, the device comprising:
the supply module is used for opening an air circuit and a hydrogen circuit of the electric pile under the condition that the fuel cell system is shut down, and continuously supplying air and hydrogen to the electric pile respectively;
the first closing module is used for closing an air path of the galvanic pile and opening an air bypass so that air cannot flow into the galvanic pile;
the oxygen consumption module is used for connecting an output circuit connected with the galvanic pile in parallel and simultaneously executing hydrogen purging operation to enable hydrogen in the galvanic pile to react with oxygen in the air so as to consume the oxygen in the galvanic pile;
the circuit breaking module is used for breaking the output circuit when the oxygen is consumed completely;
and the second closing module is used for closing the hydrogen path and the air bypass.
9. A computer arrangement comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the shutdown control method of any one of claims 1 to 7 when executing the computer program.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the shutdown control method of any one of claims 1 to 7.
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