CN214505555U

CN214505555U - System for controlling low pressure output of PEM fuel cell using air ejector

Info

Publication number: CN214505555U
Application number: CN202023118751.3U
Authority: CN
Inventors: 李昌泉; 郝义国; 胡帅
Original assignee: Wuhan Grove Hydrogen Energy Automobile Co Ltd
Current assignee: Wuhan Grove Hydrogen Automobile Co Ltd; Wuhan Grove Hydrogen Energy Automobile Co Ltd
Priority date: 2020-12-22
Filing date: 2020-12-22
Publication date: 2021-10-26
Anticipated expiration: 2030-12-22

Abstract

The utility model discloses a system for utilize air ejector to control PEM fuel cell low pressure output, including high-pressure nitrogen cylinder, hydrogen cylinder, solenoid valve, hydrogen circulating pump, hydrogen tail valve, first mixing chamber, air tail valve, load resistance, draw and penetrate gas control valve, ejector and be drawn and penetrate gas control valve, install the solenoid valve on the one end pipeline of hydrogen cylinder, the one end of solenoid valve is connected with hydrogen circulating pump and hydrogen tail valve, the one end of hydrogen tail valve is connected with first mixing chamber, and the one end of first mixing chamber installs air tail valve, the one end of air tail valve is equipped with draws and penetrates gas control valve. The system for controlling the low-voltage output of the PEM fuel cell by using the air ejector takes the PEM fuel cell as an object, improves the air supply system of the fuel cell, controls the open-circuit voltage of the fuel cell by using the air ejector, prevents the electrode of the fuel cell from being damaged, thereby saving the cost and prolonging the service life.

Description

System for controlling low pressure output of PEM fuel cell using air ejector

Technical Field

The utility model relates to a fuel cell technical field specifically is the system that utilizes the air ejector to control PEM fuel cell low pressure output.

Background

In recent years, fuel cell vehicles are under intense heat development. However, the popularization and application of fuel cell vehicles has faced a number of difficulties and challenges. The cost and life of fuel cells is a non-negligible aspect. In operation, Proton Exchange Membrane Fuel Cells (PEMFCs) need to operate within an acceptable voltage range (cell voltage does not exceed 0.8V), especially under adverse conditions such as fuel cell shutdown purge, idle, or other conditions where fuel cell output is not required. To the extent that the voltage of a fuel cell often exceeds a certain limit, the electrodes of the fuel cell can be damaged, thereby reducing the performance and service life of the fuel cell, a system has been proposed that uses an air ejector to control the low voltage output of a PEM fuel cell.

Disclosure of Invention

An object of the utility model is to provide an application air ejector controls the system of PEM fuel cell low pressure output to solve the problem that provides among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: the system for controlling the low-pressure output of the PEM fuel cell by using the air ejector comprises a high-pressure nitrogen cylinder, a hydrogen cylinder, an electromagnetic valve, a hydrogen circulating pump, a hydrogen tail discharge valve, a first mixing chamber, an air tail discharge valve, a load resistor, an ejection gas regulating valve, an ejector and an ejected gas regulating valve, wherein the electromagnetic valve is installed on a pipeline at one end of the hydrogen cylinder;

the injection gas regulating valve is used for regulating the flow of injection gas, and the injected gas regulating valve is used for regulating the flow of injected gas;

the ejector is formed by sequentially connecting an ejector nozzle, a receiving chamber, a second mixing chamber and a diffusion chamber.

Preferably, the load resistor is used to draw a small current from the fuel cell during the shutdown purge.

Preferably, the high-pressure nitrogen cylinder forms a communicating structure with the ejector through the ejected gas regulating valve.

Preferably, the load resistor is electrically connected between the anode and the cathode.

Compared with the prior art, the beneficial effects of the utility model are that: the system for controlling the low-voltage output of the PEM fuel cell by using the air ejector takes the PEM fuel cell as an object, improves the air supply system of the fuel cell, controls the open-circuit voltage of the fuel cell by using the air ejector, prevents the electrode of the fuel cell from being damaged, thereby saving the cost and prolonging the service life;

the ejector injected fluid is the waste gas of the cathode, and the waste gas is recycled into the fuel cell through the ejector, so that the available amount of oxygen in the cathode gas is reduced, the open-circuit voltage of the fuel cell is prevented from being too high, and meanwhile, the humidity requirement of the gas recycled into the fuel cell is ensured by the cathode humid waste gas; the mixed gas recycled to the cathode only reduces the content of oxygen but does not reduce the flow, so that the uniformity of the voltage of each single body of the fuel cell is ensured;

the nitrogen of the working fluid of the ejector can quickly reduce the oxygen content in the cathode inlet gas, thereby quickly reducing the output voltage of the fuel cell. In addition, the ejector is simple in structure and low in cost, energy consumption is not needed, the efficiency of the system is greatly improved, and the cost is reduced.

Drawings

FIG. 1 is a schematic diagram of the air injection system of the present invention;

fig. 2 is the schematic diagram of the ejector structure of the present invention.

In the figure: 1. a high-pressure nitrogen cylinder; 2. a hydrogen gas cylinder; 3. an electromagnetic valve; 4. a hydrogen circulation pump; 5. a hydrogen tail discharge valve; 6. a mixing chamber; 7. an air exhaust valve; 8. a load resistance; 9. an injection gas regulating valve; 10. An ejector; 11. an injected gas regulating valve; 12. an eductor nozzle; 13. a receiving chamber; 14. a mixing chamber; 15. a diffusion chamber.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-2, the present invention provides a technical solution: a system for controlling the low-pressure output of a PEM fuel cell by using an air ejector comprises a high-pressure nitrogen cylinder 1, a hydrogen cylinder 2, an electromagnetic valve 3, a hydrogen circulating pump 4, a hydrogen tail discharge valve 5, a first mixing chamber 6, an air tail discharge valve 7, a load resistor 8, an ejection gas regulating valve 9, an ejector 10 and an ejected gas regulating valve 11, wherein the electromagnetic valve 3 is installed on a pipeline at one end of the hydrogen cylinder 2, one end of the electromagnetic valve 3 is connected with the hydrogen circulating pump 4 and the hydrogen tail discharge valve 5, one end of the hydrogen tail discharge valve 5 is connected with the first mixing chamber 6, and one end of the first mixing chamber 6 is provided with an air tail discharge valve 7, one end of the air tail discharge valve 7 is provided with an injection gas regulating valve 9, one end of the injection gas regulating valve 9 is connected with an injector 10, an injected gas regulating valve 11 is installed on the injector 10, and one end of the injector 10 is connected with a high-pressure nitrogen cylinder 1; the injection gas regulating valve 9 is used for regulating the flow of injection gas, the injected gas regulating valve 11 is used for regulating the flow of injected gas, the injector 10 is formed by sequentially connecting an injector nozzle 12, a receiving chamber 13, a second mixing chamber 14 and a diffusion chamber 15, gas enters the receiving chamber 13 through the injector nozzle 12, then is mixed through the second mixing chamber 14, and finally is diffused and discharged through the diffusion chamber 15;

when the fuel cell is shut down and purged, in order to prevent the fuel cell from damaging the electrode due to overhigh monomer, the voltage of the fuel cell needs to be maintained below a limit value, the high-pressure nitrogen of the high-pressure nitrogen bottle 1 reaches the inlet of the ejector 10 through the injected gas regulating valve 11 and is used for ejecting air with lower oxygen concentration from the cathode, the injected gas regulating valve 9 and the injected gas regulating valve 11 can be used for regulating the flow of the injected gas and the injected gas, the oxygen content of the gas entering the cathode is reduced by ejecting residual waste gas of the cathode through the high-pressure nitrogen, the potential of the fuel cell is further reduced, and unnecessary damage to the stack due to overhigh voltage is avoided;

meanwhile, the humidity of mixed gas entering the galvanic pile can be improved by air with wet cathode, the damage of the overdry gas to a proton exchange membrane is avoided, at the anode, high-pressure hydrogen of a hydrogen bottle 2 enters an anode inlet of the galvanic pile through each stage of pressure reduction and a control electromagnetic valve 3 thereof, unconsumed hydrogen is conveyed to the anode inlet again through a hydrogen circulating pump 4 to participate in reaction again, a hydrogen tail valve 5 and an air tail valve 7 are tail valves of a hydrogen gas circuit and an air gas circuit respectively, residual waste gas of the anode and the cathode is diluted in a first mixing chamber 6 and then discharged to the atmosphere, and a load resistor 8 is used for drawing small current from a fuel cell during shutdown purging to enable the voltage of the galvanic pile to be reduced quickly; the system for controlling the low-voltage output of the PEM fuel cell by using the air ejector takes the PEM fuel cell as an object, the air supply system of the fuel cell is improved, the open-circuit voltage of the fuel cell is controlled by using the air ejector, the electrode of the fuel cell is prevented from being damaged, the cost is saved, the service life is prolonged, the oxygen content in the cathode inlet gas can be quickly reduced by the working fluid nitrogen of the ejector, the output voltage of the fuel cell is quickly reduced, in addition, the ejector is simple in structure and low in cost, energy does not need to be consumed, the efficiency of the system is greatly improved, and the cost is reduced.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. System for application air ejector controls PEM fuel cell low pressure output, including high-pressure nitrogen gas cylinder (1), hydrogen cylinder (2), solenoid valve (3), hydrogen circulating pump (4), hydrogen tail row valve (5), first mixing chamber (6), air tail row valve (7), load resistance (8), draw and penetrate gas control valve (9), ejector (10) and be drawn and penetrate gas control valve (11), its characterized in that: the device is characterized in that a pipeline at one end of the hydrogen cylinder (2) is provided with an electromagnetic valve (3), one end of the electromagnetic valve (3) is connected with a hydrogen circulating pump (4) and a hydrogen tail discharge valve (5), one end of the hydrogen tail discharge valve (5) is connected with a first mixing chamber (6), one end of the first mixing chamber (6) is provided with an air tail discharge valve (7), one end of the air tail discharge valve (7) is provided with an injection gas regulating valve (9), one end of the injection gas regulating valve (9) is connected with an injector (10), the injector (10) is provided with an injected gas regulating valve (11), and one end of the injector (10) is connected with a high-pressure nitrogen cylinder (1);

the injection gas regulating valve (9) is used for regulating the flow of injection gas, and the injected gas regulating valve (11) is used for regulating the flow of injected gas;

the ejector (10) is formed by sequentially connecting an ejector nozzle (12), a receiving chamber (13), a second mixing chamber (14) and a diffusion chamber (15).

2. The system for controlling low pressure output of a PEM fuel cell utilizing an air eductor of claim 1, wherein: the load resistor (8) is used to draw a small current from the fuel cell during shutdown purge.

3. The system for controlling low pressure output of a PEM fuel cell utilizing an air eductor of claim 1, wherein: the high-pressure nitrogen cylinder (1) forms a communicating structure with the ejector (10) through the ejected gas regulating valve (11).

4. The system for controlling low pressure output of a PEM fuel cell utilizing an air eductor of claim 1, wherein: the load resistor (8) is electrically connected between the anode and the cathode.