Fuel battery cathode system

Abstract

The invention discloses a fuel battery cathode system which comprises an air filter, an air-flow meter, an air compressor, a humidifier, a fuel battery galvanic pile, a water segregator and an air throttle, wherein the air filter is connected with the air-flow meter, the air compressor and the humidifier sequentially through pipelines; and the humidifier is connected with the fuel battery galvanic pile through a two-way pipeline, the humidifier is also connected with the air throttle and the water segregator respectively through pipelines, and the outlet end of the water segregator is connected with the air compressor through a pipeline. The fuel battery cathode system provided by the invention has the advantages that tail gas of a cathode side flows back into the inlet of the air compressor, the humidification is effectively improved so as to be beneficial to uniform humidification of gas after reaction, and the gas distribution among single batteries of a battery unit is improved; and the fresh air quantity required by the reaction is reduced under idle speed and low load conditions, the oxygen use ratio is improved, the high voltage problem of single batteries is solved under the idle speed and low load conditions, and the flow is simple and is easy to realize.

Description

technical field [0001] The invention relates to the field of fuel cells, in particular to a proton exchange membrane fuel cell cathode system. Background technique [0002] In order to protect the environment and reduce air pollution in cities, devices powered by PEMFC (Proton Exchange Membrane Fuel Cell) have received more and more attention. When PEMFC is fueled by pure hydrogen, it can achieve true "zero" emissions . At present, PEMFC has certain applications in transportation, communication and other fields. During the working process of the fuel cell, idle speed and low load occupy a certain proportion of time in almost every working condition, and the idle speed and low load state have a great impact on the life of the fuel cell itself, so optimize the idle speed and low load It is particularly important to determine the working state of the fuel cell. Under the condition of idling speed and low load, there are three major problems to be solved: 1. Humidification pr...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above-mentioned problems existing in the prior art, the present invention is to design a fuel cell cathode system that can not only solve the problem of humidification, but also solve the problem of gas distribution and idle speed and low-load single-cell high voltage.

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