Hydrogen gas system for enhancing fuel battery service life

Abstract

A hydrogen system for improving the operational life of a fuel cell comprises a fuel cell stack (1), a hydrogen supply part (2) and a hydrogen reflux part (3), and is characterized by also comprising a hydrogen purging part (4) which consists of a high-pressure purging gas cylinder (41) with purging gas, a purging gas control electromagnetic valve (44) connected with the purging gas cylinder, a reducing valve (43) communicated with the purging gas control electromagnetic valve (44) and a one way valve (42) connected with the purging gas cylinder (41). The residual hydrogen on the hydrogen chamber and the hydrogen channel of the fuel cell stack is removed through purging by the hydrogen purging part; the hydrogen chamber of the fuel cell membrane electrode can be effectively prevented from generating higher instant electric potential by electrochemical reactions to burn the membrane electrode when the system starts up or shuts down, thereby greatly improving the life-span of proton exchange membrane fuel cell. The invention is also characterized by simple structure, high efficiency and long life-span.

Description

technical field [0001] The invention relates to a proton exchange membrane fuel cell, in particular to a hydrogen system of the proton exchange membrane fuel cell. Background technique [0002] Proton exchange membrane fuel cell can be used as a power plant for cars and boats. The working mode of an engine powered by a proton exchange membrane fuel cell is similar to that of an internal combustion engine. It must continuously feed hydrogen fuel and oxidant into the battery, and continuously discharge reaction product water and certain waste heat to maintain the balance of battery materials and heat. Therefore, in order to maintain the continuous operation of the proton exchange membrane fuel cell engine system, it usually includes an air system, a hydrogen system and a cooling part. The air system provides air with certain pressure, humidity and temperature to the fuel cell to ensure the supply of oxidant; the hydrogen system provides hydrogen with corresponding pressure, h...

AI Technical Summary

Problems solved by technology

[0005] 1. When the proton exchange membrane fuel cell engine is shut down for a long time, due to the inevitable slight leakage of the battery hydrogen cavity and the hydrogen pipeline, the air enters the battery hydrogen cavity, and under the action of the catalyst on the battery membrane electrode (MEA) , the residual hydrogen in the hydrogen chamber reacts electrochemically with the oxygen in the air, which instantly generates a higher potential, which easily burns the membrane electrode (MEA) and reduces the service life of the proton exchange membrane fuel cell

[0006] 2. When the proton exchange membrane fuel cell engine is turned on and fed with hydrogen, under the action of the catalyst on the battery membrane electrode (MEA), the hydrogen first electrochemically reacts with the oxygen in the air leaked into the hydrogen chamber, and a high potential, easy to burn the membrane electrode (MEA)

[0007] 3. For the newly assembled proton exchange membrane fuel cell engine, due to the natural existence of a large amount of air in the pipeline, hydrogen circuit components and battery hydrogen chamber, electrochemical reactions in the hydrogen chamber are more likely to occur when starting up, and a higher potential is generated instantaneously, reducing the proton Service life of exchange membrane fuel cells

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