CN215771226U

CN215771226U - Fuel cell purging system

Info

Publication number: CN215771226U
Application number: CN202121928912.7U
Authority: CN
Inventors: 刘亚举; 李飞强; 张国强
Original assignee: Beijing Sinohytec Co Ltd
Current assignee: Beijing Sinohytec Co Ltd
Priority date: 2021-08-18
Filing date: 2021-08-18
Publication date: 2022-02-08
Anticipated expiration: 2031-08-18

Abstract

The utility model provides a fuel cell purging system, and relates to the technical field of fuel cells. This fuel cell sweeps system, spout, tail device and three-way valve including pile, air compressor machine, hydrogen circulator, hydrogen, three-way valve one sets up on the pipeline of air compressor machine export and pile air inlet, and two three-way valves set up on the pipeline between pile hydrogen export and hydrogen circulator, and three-way valve one communicates with two three-way valves, and three-way valve three sets up between the pipeline of hydrogen circulator and hydrogen spout, and three and the tail device intercommunication of three-way valve. The hydrogen circulator, the three-way valve II and the three-way valve III form a hydrogen circulation flow path. The utility model solves the problems of difficult start-up and failed start-up of the hydrogen circulator during cold start of the fuel cell system, avoids the problems of irreversible damage to the galvanic pile caused by hydrogen gas under-breathing and reverse pole, burning of the hydrogen circulator motor and the like caused by the cold start failure of the hydrogen circulator, protects the galvanic pile and the hydrogen circulator motor, and greatly reduces the economic loss caused by the cold start failure.

Description

Fuel cell purging system

Technical Field

The utility model relates to the technical field of fuel cells, in particular to a fuel cell purging system.

Background

Among the core components of the fuel cell, the stack is the heart of the fuel cell and provides electric energy; hydrogen is the "blood" of the fuel cell; the hydrogen circulation system is the strong cardiac muscle and ensures the up-and-down circulation of blood. Therefore, the hydrogen circulation system is also one of the key technologies of the fuel cell engine, and the mainstream scheme of the current light circulation system is to install a hydrogen circulation pump. Cold start (successful start of a fuel cell from below 0 ℃ and running to normal temperature (70-80 ℃) is called cold start) is the biggest challenge for fuel cell vehicles to run in winter, especially in northern winter. The circulating pump serving as the core component of the hydrogen circulating system of the fuel cell is also exposed to cold start; cold start of the hydrogen circulation pump is also a challenge. The main reason for the difficulty in cold start of the light circulating pump is that water remaining in the pump body freezes at low temperature during hydrogen circulation, so that the water pump cannot normally operate during cold start, and hydrogen cannot circulate; a motor that burns off the hydrogen circulation pump seriously causes the whole fuel cell system to be paralyzed.

In the prior art, CN201910237742.9, CN202010480214.9, CN201910377305.7, CN202011231783.6 and CN202011231783.6, these patents either purge the water inside the stack for cold start of the stack, and do not treat the residual water in the hydrogen circulating pump, or purge and evacuate the stack by a complex structure or a complex method, so that the residual water content is removed more sufficiently, thereby improving the success rate of low-temperature start of the fuel cell engine. It can be seen that there is no compact and efficient purge arrangement in the prior art for removing residual water from a fuel cell system.

Therefore, it is desirable to provide a purging system for a fuel cell to solve the technical problem of the prior art that the residual water in the fuel cell system cannot be removed simply and efficiently.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a fuel cell purging system, which solves the problem that a hydrogen circulator is difficult to start and fails to start when a fuel cell system is in cold start, protects a stack and a motor of the hydrogen circulator and greatly reduces economic loss caused by the failure of the cold start.

In order to realize the purpose, the following technical scheme is provided:

the utility model provides a fuel cell purging system which comprises a stack, an air compressor, a hydrogen circulator, a hydrogen spraying and tail discharging device and three-way valves, wherein a first three-way valve is arranged on a pipeline between an outlet of the air compressor and an air inlet of the stack, a second three-way valve is arranged on a pipeline between a hydrogen outlet of the stack and the hydrogen circulator, the first three-way valve is communicated with the second three-way valve, a third three-way valve is arranged between the hydrogen circulator and a pipeline of a hydrogen spraying port, the third three-way valve is communicated with the tail discharging device, and the hydrogen circulator, the second three-way valve and the third three-way valve form a hydrogen circulation flow path.

Further, the three-way valves are all electric control three-way valves.

Further, the fuel cell purging system also comprises a hydrogen exhaust valve, and the hydrogen exhaust valve is arranged on a pipeline between the hydrogen outlet of the pile and the tail exhaust device.

Further, the fuel cell purging system further comprises an air outlet throttle valve, and the air outlet throttle valve is arranged on a pipeline between the air outlet of the electric pile and the tail exhaust device.

Further, the fuel cell purging system also comprises a hydrogen storage device, and the inlet of the hydrogen jet is connected with the hydrogen storage device.

Further, the hydrogen circulator is a hydrogen circulation pump.

Further, the hydrogen circulator is a hydrogen circulating pump with an additional heat tracing band.

Further, the hydrogen circulator is an ejector with a heating function.

Further, the fuel cell purging system also comprises a pressure reducing valve, and the pressure reducing valve is sequentially connected to a pipeline between the hydrogen storage device and the hydrogen injection device.

Further, the fuel cell purging system further includes a safety valve connected to a line between the pressure reducing valve and the hydrogen injection.

Compared with the prior art, the fuel cell purging system provided by the utility model has the advantages that the three-way valve I is additionally arranged at the air stacking position to control the air flow direction, and the three-way valve II and the three-way valve III are additionally arranged at the front and the back of the hydrogen circulator to control the gas flowing through the circulating pump. 1) And after the stack purging is finished, dry air pressurized and heated by an air compressor enters the stack three-way valve I through the air to change the flow direction, flows to the three-way valve II, and simultaneously controls the hydrogen circulator, the three-way valve II and the three-way valve III to enable the air to enter the tail discharge device through the hydrogen circulator, so that the purging of residual moisture in the hydrogen circulator is completed. 2) And when the cold start, the hydrogen circulator is opened, hydrogen sequentially passes through the second three-way valve, the hydrogen circulator and the third three-way valve to reach the tail discharge device through the second three-way valve and the third three-way valve, replacement of residual air by the hydrogen is completed, and meanwhile, a large amount of air enters the tail discharge device through the control air compressor and the first three-way valve, so that the hydrogen concentration of the tail discharge device is reduced. The utility model solves the problems of difficult start-up and failed start-up of the hydrogen circulator during cold start of the fuel cell system, avoids the problems of irreversible damage to the galvanic pile caused by hydrogen gas under-breathing and reverse pole, burning of the hydrogen circulator motor and the like caused by the cold start failure of the hydrogen circulator, protects the galvanic pile and the hydrogen circulator motor, and greatly reduces the economic loss caused by the cold start failure.

The summary is provided to introduce a selection of concepts in a simplified form that are further described below in the detailed description. The summary is not intended to identify key features or essential features of the disclosure, nor is it intended to limit the scope of the disclosure.

Drawings

The foregoing and other objects, features and advantages of the disclosure will be apparent from the following more particular descriptions of exemplary embodiments of the disclosure as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the exemplary embodiments of the disclosure.

Fig. 1 shows a schematic configuration diagram of a fuel cell purge system according to an embodiment of the present invention.

Reference numerals:

1-electric pile; 2, an air compressor; 3-a hydrogen circulator; 4-hydrogen spraying; 5-tail row device; 6, a first three-way valve; 7-a second three-way valve; 8-a three-way valve III; 9-hydrogen gas exhaust valve; and 10-air outlet throttle valve.

Detailed Description

Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

The term "include" and variations thereof as used herein is meant to be inclusive in an open-ended manner, i.e., "including but not limited to". Unless specifically stated otherwise, the term "or" means "and/or". The term "based on" means "based at least in part on". The terms "one example embodiment" and "one embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". The terms "first," "second," and the like may refer to different or the same object. Other explicit and implicit definitions are also possible below.

As shown in fig. 1, the present embodiment provides a fuel cell purging system, including the pile 1, the air compressor machine 2, the hydrogen circulator 3, hydrogen spouts 4, tail row device 5 and three-way valve, a three-way valve 6 sets up on the pipeline of the 2 export of air compressor machine and the 1 air inlet of pile, a three-way valve two 7 sets up on the pipeline between the 1 hydrogen export of pile and hydrogen circulator 3, a three-way valve 6 and two 7 intercommunications of three-way valve, a three-way valve three 8 sets up between the pipeline that the 4 exports are spouted to hydrogen circulator 3 and hydrogen, and a three-way valve three 8 and tail row device 5 intercommunicate. The hydrogen circulator 3, the second three-way valve 7, and the third three-way valve 8 constitute a hydrogen circulation flow path.

Preferably, the three-way valves are all electrically controlled three-way valves, and in particular, the three electrically controlled three-way valves are all connected with a controller, and the controller respectively controls the three electrically controlled three-way valves to open and close.

Further, the fuel cell purging system of the present embodiment further includes a hydrogen gas exhaust valve 9, where the hydrogen gas exhaust valve 9 is disposed on a pipeline between the hydrogen outlet of the stack 1 and the tail device 5, and is configured to exhaust part of the unsuitable hydrogen gas from the hydrogen outlet of the stack 1 to the tail device 5.

Optionally, the fuel cell purging system further comprises an air outlet throttle valve 10, and the air outlet throttle valve 10 is disposed on a pipeline between the air outlet of the stack 1 and the tail discharge device 5 and is used for adjusting the gas flow of the air outlet pipeline of the stack 1.

Further, the fuel cell purging system also comprises a hydrogen storage device, and the inlet of the hydrogen nozzle 4 is connected with the hydrogen storage device.

Preferably, the hydrogen circulator 3 of the present embodiment is a hydrogen circulation pump. In other embodiments, the hydrogen circulator 3 may also adopt a hydrogen circulating pump with an additional heat tracing band, or the hydrogen circulator 3 adopts an ejector with a heating function.

Further, the fuel cell purging system also comprises a pressure reducing valve and a safety valve which are sequentially connected to a pipeline between the hydrogen storage device and the hydrogen injection device 4 so as to reduce the pressure of hydrogen from the hydrogen storage device and ensure the safety.

In the fuel cell purging system provided by the embodiment, the three-way valve I6 is additionally arranged at the air stack inlet to control the air flow direction, and the three-way valve II 7 and the three-way valve III 8 are additionally arranged at the front and the rear of the hydrogen circulator 3 to control the gas flowing through the circulating pump. 1) When the purging of the galvanic pile 1 is finished, dry air pressurized and heated by the air compressor 2 enters the pile three-way valve 6 through the air to change the flow direction, flows to the two three-way valve 7, and simultaneously controls the hydrogen circulator 3, the two three-way valve 7 and the three-way valve 8 to enable the air to enter the tail discharge device 5 through the hydrogen circulator 3, so that the purging of residual moisture in the hydrogen circulator 3 is completed. 2) Open hydrogen circulator 3 when cold start, make hydrogen pass through three-way valve two 7, hydrogen circulator 3 and three 8 arrival tail-gate devices 5 of three-way valve in proper order through controlling two 7 and three 8 three-way valve of three-way valve, accomplish the replacement of hydrogen to residual air, make a large amount of air get into tail-gate devices 5 through controlling air compressor machine 2 and three-way valve 6 simultaneously and reduce tail-gate devices 5 hydrogen concentration. The utility model solves the problems of difficult start-up and failed start-up of the hydrogen circulator 3 during cold start of the fuel cell system, avoids the problems of irreversible damage to the galvanic pile 1 caused by hydrogen gas under-breathing and reverse electrode, burning of the hydrogen circulator 3 motor and the like caused by the cold start-up failure of the hydrogen circulator 3, protects the motors of the galvanic pile 1 and the hydrogen circulator 3, and greatly reduces the economic loss caused by the cold start-up failure.

Having described embodiments of the present disclosure, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terms used herein were chosen in order to best explain the principles of the embodiments, the practical application, or technical improvements to the techniques in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. The utility model provides a fuel cell purging system, its characterized in that includes that pile (1), air compressor machine (2), hydrogen circulator (3), hydrogen spout (4), tail row device (5) and three-way valve, and three-way valve (6) set up on the pipeline of air compressor machine (2) export and pile (1) air inlet, and three-way valve two (7) set up on the pipeline between pile (1) hydrogen export and hydrogen circulator (3), three-way valve (6) with two (7) intercommunications of three-way valve, three (8) of three-way valve set up between the pipeline that (4) export was spouted to hydrogen circulator (3) and hydrogen, just three (8) of three-way valve and tail row device (5) intercommunication, hydrogen circulator (3), two (7) of three-way valve and three (8) constitute hydrogen circulation flow path.

2. A fuel cell purge system according to claim 1, wherein the three-way valves are all electrically controlled three-way valves.

3. A fuel cell purge system according to claim 1, further comprising a hydrogen gas vent valve (9), the hydrogen gas vent valve (9) being disposed on a line between the stack (1) hydrogen outlet and the tail gate device (5).

4. The fuel cell purge system according to claim 1, further comprising an air outlet throttle valve (10), the air outlet throttle valve (10) being disposed on a pipeline between an air outlet of the stack (1) and the tail gate device (5).

5. A fuel cell purge system according to claim 1, further comprising a hydrogen storage device, the inlet of the hydrogen jet (4) being connected to the hydrogen storage device.

6. A fuel cell purge system according to claim 1, wherein the hydrogen circulator (3) is a hydrogen circulation pump.

7. A fuel cell purge system according to claim 6, wherein the hydrogen circulator (3) is a hydrogen circulation pump with the addition of a heat tracing band.

8. A fuel cell purge system according to claim 1, wherein the hydrogen circulator (3) is an ejector with a heating function.

9. A fuel cell purge system according to any of claims 1-8, further comprising a pressure relief valve connected in line between the hydrogen storage means and the hydrogen injection port (4).

10. The fuel cell purge system according to claim 9, further comprising a safety valve connected to a line between the pressure reducing valve and the hydrogen injection port (4).