CN213071184U

CN213071184U - Fuel cell anode gas circulation structure

Info

Publication number: CN213071184U
Application number: CN202021992268.5U
Authority: CN
Inventors: 杨长江; 胡帅; 李涛; 欧阳瑞; 刘昕; 徐川江
Original assignee: Chongqing Dida Industrial Technology Research Institute Co Ltd
Current assignee: Chongqing Dida Industrial Technology Research Institute Co Ltd
Priority date: 2020-09-11
Filing date: 2020-09-11
Publication date: 2021-04-27
Anticipated expiration: 2030-09-11

Abstract

The utility model relates to a fuel cell anode gas circulation structure, including first solenoid valve, second solenoid valve, circulating pump, hydrogen bottle, pile, pressure relief device and three-way valve, the output of hydrogen bottle is linked together with pressure relief device's input, and the first interface of three-way valve is connected to pressure relief device's output, and the input of first solenoid valve is connected to the second interface of three-way valve, and the input of second solenoid valve is connected to the output of first solenoid valve, the input of second solenoid valve passes through the circulating pump and is connected with the anode outlet of pile, the anode inlet of pile with the third interface of three-way valve links to each other, and the output of second solenoid valve is used for discharging the impurity that accumulates in pile anode gas into the atmosphere; the utility model discloses enable sweeping of positive pole more thoroughly to the utilization ratio of fuel can improve greatly.

Description

Fuel cell anode gas circulation structure

Technical Field

The utility model relates to a new energy automobile research field especially relates to a fuel cell anode gas circulation structure.

Background

Proton Exchange Membrane Fuel Cells (PEMFCs) have many advantages over internal combustion engines, including low operating temperature, low noise, low pollutant emissions, high power density, and high efficiency. In laboratory experiments, Proton Exchange Membrane Stacks (PEMFCs) are always provided with an excess of hydrogen stoichiometry to avoid fuel starvation and to remove the liquid water produced. Purging of the anode is necessary because water and nitrogen from the cathode can gradually diffuse to the anode and accumulate in the anode during stack operation, resulting in dilution of hydrogen and degradation of stack performance. Most of the currently widely used anode purging strategies control the opening or closing of the purge valve at certain time intervals, so that purging of the anode is not thorough on the one hand, because gas impurities are accumulated in the anode even in a recirculation mode, and on the other hand, the simple gas management strategy inevitably causes hydrogen waste, reduces the fuel utilization rate and deteriorates the economy.

The utility model discloses an improved the positive pole hydrogen circulation system of galvanic pile, added two solenoid valves at circulation circuit to propose corresponding control strategy and carry out the gaseous management of positive pole, this strategy enables sweeping of positive pole more thoroughly, and the utilization ratio of fuel can improve greatly.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention provides a fuel cell anode gas circulation structure.

The utility model provides a fuel cell anode gas circulation structure, includes first solenoid valve, second solenoid valve, circulating pump, hydrogen bottle, pile, pressure relief device and three-way valve, and the output of hydrogen bottle is linked together with pressure relief device's input, and the first interface of three-way valve is connected to pressure relief device's output, the input of the first solenoid valve of second interface connection of three-way valve, the input of second solenoid valve is connected to the output of first solenoid valve, the input of second solenoid valve passes through the anode exit linkage of circulating pump with the pile, the anode inlet of pile with the third interface of three-way valve links to each other, and the output of second solenoid valve is used for discharging the impurity of accumulation in pile anode gas into the atmosphere.

Further, the first solenoid valve and the second solenoid valve are pilot-operated solenoid valves.

Further, first solenoid valve and second solenoid valve include the base and set up the valve casing of base upside, be provided with inlet channel and discharge passage on the base.

Further, the valve housing contains a solenoid coil, a magnetic core, and a guide post having a guide hole inside.

Further, a v-shaped sealing ring is arranged between the magnetic core and the inner wall of the guide hole.

Further, the pressure reducing device is a pressure reducing valve.

Further, the electric pile is composed of a plurality of single cells.

The utility model provides a beneficial effect that technical scheme brought is: the anode is subjected to a compression process before being purged, so that the purging of the anode gas impurities is cleaner; the traditional anode gas circulation system does not need to be improved too much, only two electromagnetic valves are added, and proper control is carried out simultaneously, so that the cost is low and the realization is easy.

Drawings

FIG. 1 is a schematic diagram of an apparatus for a fuel cell anode gas circulation structure;

fig. 2 is a flow chart of control for switching the mode according to the operating state of the stack;

in the figure: 1-hydrogen bottle, 2-pressure reducing device, 3-three-way valve, 4-first electromagnetic valve, 5-second electromagnetic valve, 6-circulating pump and 7-electric pile.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention will be further described below with reference to the accompanying drawings.

Please refer to fig. 1, an embodiment of the present invention provides a fuel cell anode gas circulation structure, including a first solenoid valve 4, a second solenoid valve 5, a circulation pump 6, a hydrogen bottle 1, a stack 7, a pressure reducing device 2 and a three-way valve 3, an output end of the hydrogen bottle 1 is connected to an input end of the pressure reducing device 2, an output end of the pressure reducing device 2 is connected to a first interface of the three-way valve 3, a second interface of the three-way valve 3 is connected to an input end of the first solenoid valve 4, an output end of the first solenoid valve 4 is connected to an input end of the second solenoid valve 5, an input end of the second solenoid valve 5 is connected to an anode outlet of the stack through the circulation pump 6, an anode inlet of the stack 7 is connected to a third interface of the three-way valve 3, and an output end of the second solenoid valve 5 is used for discharging.

The hydrogen bottle 1 is used for storing hydrogen and providing hydrogen required by electrochemical reaction for the electric pile 7.

The pressure reducing device 2 is used for reducing the high-pressure hydrogen from the hydrogen bottle 1 to the pressure required by the anode of the galvanic pile 7, the pressure changes along with the change of the cathode pressure of the galvanic pile, and the pressure difference between the two is not more than 40 kpa; the three-way valve 3 is used for changing the flow direction of the gas.

The first electromagnetic valve 4 and the second electromagnetic valve 5 are used for controlling the on-off of the gas flow path where the gas flow path is located, so that the conversion of the anode gas working mode of the galvanic pile 7 is realized, the hydrogen circulating pump 6 is used for realizing the circulation function of the anode hydrogen of the galvanic pile 7, and the unreacted hydrogen at the anode outlet of the galvanic pile 7 is pumped to the anode inlet at a certain pressure for reaction again.

The gas management modes adopted by the anode gas circulation structure of the galvanic pile 7 comprise a disconnection mode, a circulation mode, a compression mode and a purging mode.

In the off mode, first solenoid valve 4, second solenoid valve 5 and circulating pump 6 are all not opened, and the high-pressure gas that comes from hydrogen bottle 1 enters electric pile 7 behind the pressure relief device, along with gaseous impurity's continuous accumulation and the uneven distribution of hydrogen concentration on the monomer, the pressure differential between the monomer can increase, when reaching certain threshold k, and electric pile 7 anode gas circulation structure just gets into the circulation mode.

Impurities in anode gas of the galvanic pile 7 circulate in an anode gas loop of the galvanic pile along with more hydrogen, pressure difference of each monomer is reduced due to uniform distribution of the fuel, the anode gas circulation structure of the galvanic pile 7 enters a compression mode after running for a certain time T, the fuel is unevenly distributed between the monomers again at the moment, the pressure difference between the monomers is increased again, when a threshold value k is reached, a purging mode is entered, the first electromagnetic valve 4 is kept closed at the moment, the impurities accumulated in the anode gas are prevented from entering the circulation loop again, and all the impurities are discharged into the atmosphere through the second electromagnetic valve 5, so that purging is more thorough.

The time T is more than or equal to 1min, and the value range of the threshold value k is more than or equal to 30mv and less than or equal to 40 mv.

The purge mode is generally set to 3s, and after the purge mode is finished, the anode gas circulation structure of the stack 7 enters the off mode again, and in each mode, the open/close states of the first electromagnetic valve 4, the second electromagnetic valve 5 and the circulation pump 6 are as shown in table one:

watch one mode control rule (0-off; 1-on)

Status of state	First electromagnetic valve	Second electromagnetic valve	Circulating pump
				Mode 1 (off mode)	0	0	0
Mode 2 (Loop)Ring mode type)	0	1	1
				Mode 3 (compression mode)	0	0	1
Mode 4 (purge mode)	1	0	1

The first solenoid valve 4 and the second solenoid valve 5 are pilot-operated solenoid valves.

The first solenoid valve 4 and the second solenoid valve 5 comprise a base and a valve housing arranged on the upper side of the base, and an inlet passage and an outlet passage are arranged on the base.

The valve casing is internally provided with an electromagnetic coil, a magnetic core and a guide post, and the guide post is internally provided with a guide hole. A v-shaped sealing ring is arranged between the magnetic core and the inner wall of the guide hole; the pressure reducing device 2 is a pressure reducing valve, and the electric pile 7 is composed of a plurality of single cells.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims

1. The utility model provides a fuel cell anode gas circulation structure, its characterized in that, includes first solenoid valve, second solenoid valve, circulating pump, hydrogen bottle, pile, pressure relief device and three-way valve, and the output of hydrogen bottle is linked together with pressure relief device's input, and the first interface of three-way valve is connected to pressure relief device's output, the input of the first solenoid valve of second interface connection of three-way valve, the input of second solenoid valve is connected to the output of first solenoid valve, the input of second solenoid valve passes through the anode inlet connection of circulating pump with the pile, the anode outlet of pile with the third interface of three-way valve links to each other, and the output of second solenoid valve is used for discharging the impurity of accumulation in pile anode gas into atmosphere.

2. The fuel cell anode gas circulation structure according to claim 1, wherein the first electromagnetic valve and the second electromagnetic valve are pilot-operated electromagnetic valves.

3. The fuel cell anode gas circulation structure according to claim 1, wherein the first solenoid valve and the second solenoid valve include a base provided with an inlet passage and an outlet passage, and a valve housing provided on an upper side of the base.

4. A fuel cell anode gas circulation structure according to claim 3, wherein said valve housing contains therein a solenoid coil, a magnetic core, and a guide post having a guide hole in its interior.

5. The fuel cell anode gas circulation structure according to claim 4, wherein a v-shaped seal ring is provided between the magnetic core and the inner wall of the guide hole.

6. The fuel cell anode gas circulation structure according to claim 4, wherein the pressure reduction means is a pressure reduction valve.

7. A fuel cell anode gas circulation structure according to claim 1, wherein said stack is composed of a plurality of single cells.