Hydrogen gas security protection system for fuel cell engine

Abstract

The invention relates to a hydrogen safety system of a fuel cell engine, which comprises a hydrogen pressure reduction protecting device. The hydrogen pressure relief protecting device is arranged between a disconnecting valve and a pressure maintaining valve; the hydrogen pressure relief protecting device comprises an ejector pump, a baffle plate, a spring, a piston and a pressure difference transducer; the baffle plate, the spring and the piston are arranged in a channel at the lower end of the ejector pump; the baffle plate is connected with the piston through the spring; the outlet of the channel at the lower end of the ejector pump is connected with the outlet of a channel at the right end of the ejector pump through a pipeline to ensure that the pressure of the lower surface of the piston is identical with that of the outlet position on the right side of the ejector pump; the baffle plate is provided with an air hole to ensure that the pressure of the upper surface of the piston is identical with that of the upper part of the baffle plate; a pressure difference is generated between the upper surface and the lower surface of the piston; the pressure difference or the deformation of the spring is transmitted to a controller through a transducer; the controller can control the opening and the closing of the disconnecting valve; when the hydrogen rate exceeds the maximum allowable value, the disconnecting valve is driven to automatically close, and the hydrogen source is cut off. Compared with the prior art, the invention has the advantages of simple structure, safety,reliability, and the like.

Description

technical field [0001] The invention relates to an auxiliary device of a fuel cell, in particular to a hydrogen safety protection system for a fuel cell engine. Background technique [0002] An electrochemical fuel cell is a device that converts hydrogen and oxidants into electrical energy and reaction products. The internal core component of the device is the membrane electrode (Membrane Electrode Assembly, referred to as MEA). The membrane electrode (MEA) is composed of a proton exchange membrane and two porous conductive materials, such as carbon paper, sandwiched between the two sides of the membrane. On the two boundary surfaces of the membrane and the carbon paper, there are even and finely dispersed catalysts for initiating electrochemical reactions, such as metal platinum catalysts. Conductive objects can be used on both sides of the membrane electrode to draw the electrons generated during the electrochemical reaction through an external circuit to form a current l...

AI Technical Summary

Problems solved by technology

However, when a large amount of leakage occurs in the fuel cell stack or pipeline and the flow of hydrogen gas is too large, the pressure reducing valve cannot cut off the hydrogen source in time, which will easily lead to a large amount of leakage of high-pressure hydrogen gas, which may cause fire and explosion in severe cases.

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