Ice breaking control method and system of back pressure valve of fuel cell

Abstract

The invention discloses an ice breaking control method and system for a back pressure valve of a fuel cell. The method comprises the steps that: if it is detected that the back pressure valve is frozen, a pressure release valve is closed, a return valve is opened, and an air compressor is started; the release temperature of a release branch is collected; and if the release temperature reaches a first preset temperature, the pressure release valve is opened. According to the ice breaking control method, an outlet of the air compressor is connected with one end of the release branch, the other end of the release branch is connected with an inlet of the return valve and an inlet of the pressure release valve, an outlet of the return valve is connected with an inlet of the air compressor, and an outlet of the pressure release valve is connected with the back pressure valve. According to the ice breaking control method and system of the back pressure valve of the fuel cell,hot air can be used for heating and deicing the back pressure valve, and the ice can be melted after the back pressure valve is frozen, so that the back pressure valve can be opened.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to an ice-breaking control method and system for a fuel cell back pressure valve. Background technique [0002] The fuel cell system includes electric stack, air system, hydrogen system, cooling system, electrical system and corresponding control system. Among them, the air system is mainly composed of air compressors, back pressure valves, etc. The air system provides the oxygen required for the reaction of the stack. The chemical reaction in the stack will produce a large amount of gaseous water and liquid water. Most of the water is supplied by the air system. discharge. [0003] When the fuel cell system is shut down, the purging will continue for tens of seconds to several minutes, the purpose is to remove the moisture in the stack and pipeline components, but there may be cases where the liquid water is not completely purged during the shutdown purging process . Under no...

AI Technical Summary

Problems solved by technology

[0004] The embodiment of the present invention solves the technical problem in the prior art that the back pressure valve cannot be opened after the back pressure valve of the fuel cell is frozen by providing an ice breaking control method for the back pressure valve of the fuel cell, which can be used after the back pressure valve is frozen. Hot air heats the back pressure valve to melt the ice so the back pressure valve can open

Images