CN112510224A - System and method for supplying and circulating hydrogen of fuel cell - Google Patents
System and method for supplying and circulating hydrogen of fuel cell Download PDFInfo
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- CN112510224A CN112510224A CN202011340790.XA CN202011340790A CN112510224A CN 112510224 A CN112510224 A CN 112510224A CN 202011340790 A CN202011340790 A CN 202011340790A CN 112510224 A CN112510224 A CN 112510224A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04082—Arrangements for control of reactant parameters, e.g. pressure or concentration
- H01M8/04201—Reactant storage and supply, e.g. means for feeding, pipes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04082—Arrangements for control of reactant parameters, e.g. pressure or concentration
- H01M8/04089—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
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Abstract
The invention relates to a system and a method for supplying and circulating hydrogen of a fuel cell, wherein a hydrogen source, a pressure reducing valve, an ejector and a hydrogen inlet electromagnetic valve are sequentially connected at a hydrogen inlet of the fuel cell, the ejector is provided with a feed inlet, a discharge port, a circulating port a and a circulating port b, the feed inlet is connected with the ejector, the discharge port is connected with the hydrogen inlet electromagnetic valve, a three-way valve is connected at a hydrogen outlet of the fuel cell, one outlet of the three-way valve is connected with a tail gas treatment unit through a hydrogen exhaust pipeline, the other outlet of the three-way valve is connected with a water-vapor separator, the bottom of the water-vapor separator is connected with the hydrogen exhaust pipeline, and the top of the water-vapor separator is respectively connected with the. According to the invention, through the combination of the ejector and the ejector, the overall power consumption of the system is reduced, the recovery utilization rate of hydrogen is improved, the volume of the system is reduced, the controllability of the hydrogen supply is improved, the control time is shortened, and the system cost is saved.
Description
Technical Field
The invention relates to the technical field of fuel cells, in particular to a system and a method for supplying and circulating hydrogen of a fuel cell.
Background
The fuel cell technology is a new energy industry and has a good prospect in the future vehicle industry application.
In the fuel cell system subsystem hydrogen system, a proportional valve and a circulating pump are generally used to supply and circulate hydrogen. This has certain disadvantages. The way of controlling the hydrogen flow rate by the proportional valve is to match the flow rate and the duty ratio according to the pressure drop through PID control, which makes the supply of the hydrogen flow rate inaccurate and the control response time long.
However, the circulation pump consumes a certain amount of power during the circulation of hydrogen. The power of system is big more, and when the circulating hydrogen volume also increased, the rotational speed of circulating pump also can follow the increase, and at this moment, the whole consumption of circulating pump will increase, and then has increased entire system's consumption, has increased the connection of entire system pipeline simultaneously, and the system volume is great.
Disclosure of Invention
The present invention is directed to overcoming the above-mentioned drawbacks of the prior art and providing a system for supplying and circulating hydrogen gas that is stable, simple and easy to control.
The present application also provides a method for supplying and recycling hydrogen gas using the system.
In order to achieve the object of the present invention, the present application provides the following technical solutions.
In a first aspect, the present application provides a system for fuel cell hydrogen supply and circulation, the system comprising a fuel cell, a hydrogen source, a pressure reducing valve, an ejector and a hydrogen inlet electromagnetic valve are sequentially connected at a hydrogen inlet of the fuel cell, the ejector is provided with a feed inlet, a discharge outlet, a circulation port a and a circulation port b which are connected, the feed inlet is connected with the ejector, the discharge outlet is connected with a hydrogen inlet electromagnetic valve, a hydrogen outlet of the fuel cell is connected with a three-way valve, one outlet of the three-way valve is connected with a tail gas processing unit through a hydrogen discharge pipeline, the other outlet of the three-way valve is connected with a water-vapor separator, the bottom of the water-vapor separator is connected with a hydrogen discharge pipeline, the top of the water-vapor separator is respectively connected with the circulation port a and the circulation port b, and a circulation electromagnetic valve is arranged on a connecting pipeline between the water-vapor separator and the circulation port b. The ejector is adopted to control the ejection quantity of the hydrogen, the required hydrogen flow is calculated according to the loading current demand and the current change rate, and therefore the ejector is used for providing the required hydrogen quantity, the traditional method for adjusting the duty ratio control flow of the proportional valve is changed, the control time is shortened, the response is fast, and the method is suitable for the random fast change of the large power and the small power. Meanwhile, because the metering ratio of the supplied hydrogen is larger than 1 (the metering ratio is equal to (the jet quantity of the ejector and the circulating hydrogen quantity of the water-steam separator)/the jet quantity of the ejector), the residual hydrogen passes through the water-steam separator from the outlet of the electric pile and is ejected back to the fuel cell by the ejector. The injection hydrogen back-burning fuel battery is divided into two paths, when the low-power section is used, the circulation port a is used for circulation, and when the high-power section is used, the circulation port a and the circulation port b are used for co-operation. The combination of the ejector and the ejector reduces the overall power consumption of the system, improves the recovery rate of hydrogen, reduces the volume of the system, improves the controllability of hydrogen supply, shortens the control time, saves the system cost, reduces the length of a system pipeline, and improves the overall air tightness.
In one embodiment of the first aspect, one outlet of the three-way valve is connected to the tail gas treatment unit through a hydrogen discharge pipeline, and a hydrogen discharge electromagnetic valve is arranged on the hydrogen discharge pipeline; a water discharge electromagnetic valve is arranged between the bottom of the water-vapor separator and the hydrogen discharge pipeline.
In one embodiment of the first aspect, the fuel cell is provided with a temperature sensor and a pressure sensor at both the hydrogen inlet and the hydrogen outlet. The temperature sensor and the pressure sensor are used for monitoring the temperature and the pressure at the hydrogen inlet and the hydrogen outlet of the fuel cell, so that the excessive pressure and the temperature imbalance of the hydrogen entering the fuel cell are avoided, and the power generation performance of the fuel cell is improved; meanwhile, the regulation and the change of the strategy are facilitated.
In an embodiment of the first aspect, a pressure relief branch is provided between the hydrogen inlet and the hydrogen outlet of the fuel cell, and a pressure relief valve is provided on the pressure relief branch. Generally, when the pressure at the hydrogen outlet of the fuel cell is 1.7bar, the pressure relief valve is opened to release the pressure.
In one embodiment of the first aspect, the system is provided with a purging unit comprising a nitrogen source arranged in parallel with the hydrogen source and connected to the pressure reducing valve, and a check valve is arranged on the connecting line.
In a second aspect, the present application also provides a method for fuel cell hydrogen supply and circulation using the above system, the method comprising the steps of:
(1) controlling the amount of injected hydrogen and the inlet pressure of the ejector to obtain the relation L-P between the inlet pressure and the outlet flow of the ejector, and then installing the ejector in a system; that is, the injector is controlled to inject hydrogen according to the hydrogen flow demand, the pressure and flow can be accurately controlled. The control mode avoids PID control according to the pressure feedback condition at the rear end of the proportional valve;
(2) starting the fuel cell, adjusting the injection quantity of the injector, and monitoring the inlet pressure P of the injector in real time1Monitoring the output current I of the fuel cell in real time1；
(3) According to L-P, using injector inlet pressure P1Obtaining the outlet flow L of the ejector1；
(4) According to the output current I of the fuel cell1Calculating the power W ═ U ═ I of the fuel cell in real time1N, wherein U is the output voltage of each single cell in the fuel cell, and N is the number of the single cells in the fuel cell;
(5) when the power of the fuel cell is low, closing the circulating electromagnetic valve to enable the water-vapor separator to be only communicated with the circulating port a, and when the power of the fuel cell is high, opening the circulating electromagnetic valve to enable the water-vapor separator to be simultaneously communicated with the circulating port a and the circulating port b;
(6) when the power of the fuel cell reaches the rated power and the power is kept unchanged, the injection quantity of the injector is kept constant.
In the present application, the flow rate is adjusted by controlling the pressure, and the pressure and the flow rate are proportional, so that the corresponding values of the pressure and the flow rate of the ejector need to be measured in advance. And finding out what the pressure value corresponding to the required flow is in actual test so as to control the pressure.
When the hydrogen gas inflow of the fuel cell is different, the output current of the fuel cell is different, and the specific calculation formula is as follows:
hydrogen flow rate ═ 6.96 ═ I1N) metering ratio/1000;
the metering ratio is (the jet volume of the ejector and the circulating hydrogen volume of the water-vapor separator)/the jet volume of the ejector, the value of the metering ratio is generally 1.2-1.6, and the metering ratio is adjusted according to the actual condition;
wherein 6.96 is calculated by the following method:
(1) according to Faraday's law, 1mol of substance has a charge amount of 96500C;
(2) 1 coulomb per second, 1 ampere-1 coulomb per second, according to coulomb's law;
(3) 1/96500mol of hydrogen is needed for generating 1 ampere of current, and the molar volume of the gas is 22400 ml/mol;
(4) the hydrogen flow rate required is therefore 1/96500 × 22400/2 × 60 ═ 6.96L/min
The flow rate calculated by the current through the above formula.
While the power of the fuel cell is W-U I1N, so there is the corresponding relation of power, current and flow, plus the relation of injector pressure and flow, finding the corresponding point, there is the relation of power, current and pressure, so the pressure value of pressure sensor can stabilize the pressure needed by different powers, that is, the burning of the power can be obtained as long as the pressure value of target power is reachedAnd (4) a material battery.
In one embodiment of the second aspect, the high power and low power demarcation point is 50 kw. Because the air input of each circulation port of the ejector has a certain upper limit, and the output power of the fuel cell is larger when the hydrogen flow is larger, one circulation port can not pass through enough hydrogen when the power of the fuel cell reaches a certain value, and the second circulation port is opened. The cut-off point was actually measured to be about 50 kw.
In one embodiment of the second aspect, when the fuel cell is flooded, the fuel cell is drained, the hydrogen injection amount of the injector is reduced, and the injection amount of the injector is gradually restored.
In an embodiment of the second aspect, a pressure relief branch is provided between the hydrogen inlet and the hydrogen outlet of the fuel cell, and a pressure relief valve is provided on the pressure relief branch; when the pressure at the hydrogen inlet and the hydrogen outlet of the fuel cell is overlarge, the pressure release valve is opened to release the pressure, so that the fuel cell stack is protected from being damaged due to high-load pressure impact.
In one embodiment of the second aspect, the system is provided with a purging unit, the purging unit comprises a nitrogen source, the nitrogen source is arranged in parallel with the hydrogen source and is connected with a pressure reducing valve, and a one-way valve is arranged on the connecting pipeline; and after the fuel cell finishes working, closing the hydrogen source, opening the one-way valve and the nitrogen source, and purging the system by using nitrogen.
Compared with the prior art, the invention has the beneficial effects that:
the combination of the hydrogen injection and the ejector reduces the overall power consumption of the system, improves the recovery rate of hydrogen, reduces the volume of the system, improves the controllability of hydrogen supply, shortens the control time, saves the system cost, reduces the length of a system pipeline, and improves the overall air tightness.
Drawings
Fig. 1 is a schematic structural diagram of the system of the present application.
In the drawing, 1 is a hydrogen cylinder, 2 is a pressure reducing valve of the hydrogen cylinder, 3 is a pressure reducing valve, 4 is a third pressure sensor, 5 is an ejector, 6 is an ejector, 7 is a hydrogen inlet electromagnetic valve, 8 is a first temperature sensor, 9 is a first pressure sensor, 10 is a pressure release valve, 11 is a fuel cell, 12 is a second pressure sensor, 13 is a second temperature sensor, 14 is a water discharge electromagnetic valve, 15 is a hydrogen discharge electromagnetic valve, 16 is a water-vapor separator, 17 is a circulation electromagnetic valve, 18 is a circulation port a, 19 is a circulation port b, 20 is a nitrogen cylinder, 21 is a pressure reducing valve of the nitrogen cylinder, and 22 is a check valve.
Detailed Description
Unless otherwise defined, technical or scientific terms used herein in the specification and claims should have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. All numerical values recited herein as between the lowest value and the highest value are intended to mean all values between the lowest value and the highest value in increments of one unit when there is more than two units difference between the lowest value and the highest value.
While specific embodiments of the invention will be described below, it should be noted that in the course of the detailed description of these embodiments, in order to provide a concise and concise description, all features of an actual implementation may not be described in detail. Modifications and substitutions to the embodiments of the present invention may be made by those skilled in the art without departing from the spirit and scope of the present invention, and the resulting embodiments are within the scope of the present invention.
The invention provides a system for supplying hydrogen and circulating hydrogen by a fuel cell. The pressure reducer, the ejector and the hydrogen inlet electromagnetic valve are all arranged at the air inlet end of the fuel cell, the water-vapor separator, the hydrogen inlet stainless steel pipeline, the hydrogen outlet stainless steel pipeline and the hydrogen inlet electromagnetic valve are all arranged at the outlet end of the fuel cell and are connected with the hydrogen inlet pipeline, the outlet of the water-vapor separator is respectively connected with the circulation port of the ejector, and meanwhile, the tail exhaust is connected with the pressure release valve and the water discharge electromagnetic valve and the hydrogen discharge pipeline.
And when the system is in a low-power section, calculating the obtained hydrogen amount so as to adjust the flow of the ejector and the hydrogen outlet pressure at the rear end of the ejector, and enabling the hydrogen to enter the galvanic pile through the ejector. And then the residual hydrogen passes through a water-vapor separator, an ejector is adopted to eject the residual hydrogen through a circulation port to form a galvanic pile, the reaction is continued, and the generated water is released by an electromagnetic valve of the water-vapor separator. When the system is in a high-power section, the amount of hydrogen supplied by the ejector is timely adjusted, the hydrogen enters the fuel cell stack through the ejector, the residual hydrogen respectively returns to the circulating port and the circulating port of the ejector through the steam separator, and the two circulating ports converge the flow again and send the flow into the electric stack again.
The hydrogen injector can adjust the hydrogen flow and the hydrogen inlet pressure, and realize quick response and steady-state hydrogen supply.
And the ejector is adopted to realize the circulation of the high-power section and the low-power section through two circulation ports.
When the pressure exceeds a certain value, the pressure release valve of the fuel cell stack is automatically opened, so that the fuel cell stack is protected from being damaged due to high-load pressure impact.
And when the system is shut down, the nitrogen gas inlet valve is opened to purge.
The hydrogen is supplied from a hydrogen cylinder, and the gas is discharged through a pressure reducing valve, enters an ejector and is regulated by the ejector, so that stable hydrogen and required hydrogen pressure are improved.
The temperature sensor and the pressure sensor are arranged at the outlet of the galvanic pile, so that the temperature and the pressure at the outlet of the galvanic pile can be monitored in real time, and the numerical value is used as a basis of a control system.
Examples
The following will describe in detail the embodiments of the present invention, which are implemented on the premise of the technical solution of the present invention, and the detailed embodiments and the specific operation procedures are given, but the scope of the present invention is not limited to the following embodiments.
Example 1
A system for supplying and circulating hydrogen for a fuel cell is structurally shown in figure 1 and comprises a fuel cell 11, wherein the fuel cell 11 comprises a hydrogen inlet and a hydrogen outlet, a hydrogen inlet pipeline is arranged at the hydrogen inlet, and a hydrogen outlet pipeline is arranged at the hydrogen outlet. The hydrogen inlet pipeline comprises a hydrogen cylinder 1, a hydrogen cylinder pressure reducing valve 2, a pressure reducing valve 3, a third pressure sensor 4, an ejector 5, an ejector 6, a hydrogen inlet electromagnetic valve 7, a first temperature sensor 8 and a first pressure sensor 9 in sequence. The hydrogen discharge pipeline is sequentially provided with a second pressure sensor 12 and a second temperature sensor 13 and then divided into two paths, wherein the first path is provided with a hydrogen discharge electromagnetic valve 15, the second path is provided with a water-vapor separator 16, and the bottom of the water-vapor separator 16 is provided with a water discharge electromagnetic valve 14 and is converged with the hydrogen discharge pipeline behind the hydrogen discharge electromagnetic valve 15; the top of the water-vapor separator 16 is connected to the circulation port a18 and the circulation port b19 of the ejector 6, respectively, and a circulation solenoid valve 17 is provided in a line connected to the circulation port b 19.
A pressure relief branch is arranged between the hydrogen inlet and the hydrogen outlet, and a pressure relief valve 10 is arranged on the pressure relief branch. The system also comprises a purging unit, the purging unit sequentially comprises a nitrogen cylinder 20, a nitrogen cylinder pressure reducing valve 21 and a one-way valve 22, and an outlet of the one-way valve 22 is connected with an inlet of the pressure reducing valve 3.
The working process of the system is as follows:
(1) acquiring a relation L-P between the inlet pressure of the injector 5 and the injection quantity of the hydrogen gas;
(2) starting the fuel cell 11, adjusting the injection quantity of the injector 5, and monitoring the inlet pressure P of the injector 5 in real time1Monitoring the output current I of the fuel cell 11 in real time1；
(3) According to L-P, using the inlet pressure P of the injector 51The outlet flow L of the ejector 5 is obtained1；
(4) According to the output current I of the fuel cell 111Calculating the power W ═ U ═ I of the fuel cell 11 in real time1N, where U is the output voltage of each single cell in the fuel cell 11, and in the present embodiment, the voltage of the single cell is 0.65V, which is determined by the structure of the single cell itself, regardless of the amount of hydrogen; n is the number of single cells in the fuel cell 11, and in the present embodiment, the number of single cells is 240;
(5) when the power of the fuel cell 11 is less than 50kw, the circulation solenoid valve 17 is closed so that the water-vapor separator 16 communicates only with the circulation port a18, and when the power of the fuel cell 11 is greater than 50kw and less than 60kw (the rated output power of the fuel cell of the present embodiment is 60kw), the circulation solenoid valve 17 is opened so that the water-vapor separator 16 communicates with both the circulation port a18 and the circulation port b 19; in this process, the metering ratio was 1.5;
(6) when the power of the fuel cell 11 reaches the rated power (60kw), and when the power is kept unchanged, the injection quantity of the injector 5 is kept constant;
(7) when the fuel cell 11 is flooded with water, the fuel cell 11 is drained, the amount of hydrogen injected by the injector 5 is reduced, and the amount of hydrogen injected by the injector 5 is gradually restored.
(8) When the pressure at the hydrogen inlet and the hydrogen outlet of the fuel cell 11 is greater than 1.7bar, the pressure release valve 10 is opened to release the pressure.
(9) When the operation of the fuel cell 11 is completed, the hydrogen source is turned off, the check valve 22 and the nitrogen source are opened, and the system is purged with nitrogen.
Through actual operation, when the system rated power is 60Kw, the electric pile power is about 75Kw (system power | -power consumed by parts) consumed air flow is 802L/min, the circulation flow is 401L/min, at this time, the air intake amount only needs to be adjusted to 802L/min, as 0.5 times of the rest circulation amount is always circulated in the pipeline, the adjustment time is about 10min, and when the existing hydrogen intake system rated power is 60Kw, the electric pile power is about 73Kw (system power | -power consumed by parts), the system of the present application reduces the power consumption of the circulation pump by about 2 Kw. The consumed air flow is 781L/min, the circulating flow is 319L/min, the air inflow is only needed to be adjusted to 781L/min, and the whole adjusting time is about 12min because 0.5 time of the rest of circulation circulates in the pipeline all the time. Therefore, the system and the method can reduce the overall power consumption of the system, improve the recovery utilization rate of the hydrogen, improve the controllability of the hydrogen supply, shorten the control time and save the system cost.
The embodiments described above are intended to facilitate the understanding and appreciation of the application by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present application is not limited to the embodiments herein, and those skilled in the art who have the benefit of this disclosure will appreciate that many modifications and variations are possible within the scope of the present application without departing from the scope and spirit of the present application.
Claims (10)
1. A system for hydrogen supply and circulation of a fuel cell, characterized in that the system comprises a fuel cell, a hydrogen source, a pressure reducing valve, an ejector and a hydrogen inlet electromagnetic valve are sequentially connected at a hydrogen inlet of the fuel cell, the ejector is provided with a feed inlet, a discharge outlet, a circulation opening a and a circulation opening b, the feed inlet is connected with the ejector, the discharge outlet is connected with a hydrogen inlet electromagnetic valve, a hydrogen outlet of the fuel cell is connected with a three-way valve, one outlet of the three-way valve is connected with a tail gas processing unit through a hydrogen discharge pipeline, the other outlet of the three-way valve is connected with a water-vapor separator, the bottom of the water-vapor separator is connected with a hydrogen discharge pipeline, the top of the water-vapor separator is respectively connected with the circulation port a and the circulation port b, and a circulation electromagnetic valve is arranged on a connecting pipeline of the water-vapor separator and the circulation port b.
2. The system for supplying and circulating hydrogen gas for a fuel cell according to claim 1, wherein an outlet of the three-way valve is connected to a tail gas treatment unit through a hydrogen discharge line, and a hydrogen discharge solenoid valve is provided on the hydrogen discharge line;
a water discharge electromagnetic valve is arranged between the bottom of the water-vapor separator and the hydrogen discharge pipeline.
3. The system for hydrogen supply and circulation of a fuel cell according to claim 1, wherein the fuel cell is provided with a temperature sensor and a pressure sensor at both the hydrogen inlet and the hydrogen outlet.
4. The system for supplying and recycling hydrogen for a fuel cell according to claim 1, wherein a pressure relief branch is provided between the hydrogen inlet and the hydrogen outlet of the fuel cell, and a pressure relief valve is provided on the pressure relief branch.
5. The system for fuel cell hydrogen supply and circulation of claim 1, wherein the system is provided with a purge unit comprising a nitrogen source disposed in parallel with the hydrogen source and connected to a pressure reducing valve, and a check valve is disposed on the connecting line.
6. A method for fuel cell hydrogen supply and circulation using the system of any one of claims 1 to 5, comprising the steps of:
(1) controlling the amount of injected hydrogen and the inlet pressure of the ejector to obtain the relation L-P between the inlet pressure and the outlet flow of the ejector, and then installing the ejector in a system;
(2) starting the fuel cell, adjusting the injection quantity of the injector, and monitoring the inlet pressure P of the injector in real time1Monitoring the output current I of the fuel cell in real time1；
(3) According to L-P, using injector inlet pressure P1Obtaining the outlet flow L of the ejector1；
(4) According to the output current I of the fuel cell1Calculating the power W ═ U ═ I of the fuel cell in real time1N, wherein U is the output voltage of each single cell in the fuel cell, and N is the number of the single cells in the fuel cell;
(5) when the power of the fuel cell is low, closing the circulating electromagnetic valve to enable the water-vapor separator to be only communicated with the circulating port a, and when the power of the fuel cell is high, opening the circulating electromagnetic valve to enable the water-vapor separator to be simultaneously communicated with the circulating port a and the circulating port b;
(6) when the power of the fuel cell reaches the rated power and the power is kept unchanged, the injection quantity of the injector is kept constant.
7. The method for fuel cell hydrogen supply and circulation of claim 6, wherein the high power and low power demarcation point is 50 kw.
8. The method for hydrogen supply and circulation in a fuel cell according to claim 6, wherein when flooding occurs in said fuel cell, the fuel cell is drained and the amount of hydrogen injected from the injector is reduced and gradually restored.
9. The method for supplying and recycling hydrogen for a fuel cell according to claim 6, wherein a pressure relief branch is provided between the hydrogen inlet and the hydrogen outlet of the fuel cell, and a pressure relief valve is provided on the pressure relief branch; and when the pressure at the hydrogen inlet and the hydrogen outlet of the fuel cell is overlarge, opening the pressure release valve to release the pressure.
10. The method for fuel cell hydrogen supply and circulation according to claim 6, wherein the system is provided with a purge unit including a nitrogen source disposed in parallel with the hydrogen source and connected to a pressure reducing valve, and a check valve is provided on the connecting line; and after the fuel cell finishes working, closing the hydrogen source, opening the one-way valve and the nitrogen source, and purging the system by using nitrogen.
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| CN112803045A (en) * | 2021-04-14 | 2021-05-14 | 北京氢澜科技有限公司 | Hydrogen system control method, device and equipment of fuel cell |
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| CN114204072B (en) * | 2021-12-08 | 2023-11-14 | 山东交通学院 | Air supply system for fuel cell automobile and control method |
| CN114188568A (en) * | 2021-12-14 | 2022-03-15 | 北京亿华通科技股份有限公司 | Hydrogen supply system of multi-stack fuel cell and flow pressure control method thereof |
| CN114361517A (en) * | 2022-01-13 | 2022-04-15 | 浙江高成绿能科技有限公司 | Fuel cell stack anode water management control system and control method |
| CN114361517B (en) * | 2022-01-13 | 2024-04-12 | 浙江高成绿能科技有限公司 | Fuel cell stack anode water management control system and control method |
| NO20220710A1 (en) * | 2022-06-21 | 2023-12-22 | Norrde As | A multi-stage venturi-type apparatus, liquid treatment system, aquafarm, and method for treating liquid in a tank |
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