Fuel cell anode water management system and control method

Abstract

The invention discloses a fuel cell anode water management system and a control method, and belongs to the technical field of proton exchange membrane fuel cells. Aiming at the problem of anode watermanagement in the operation process of a proton exchange membrane fuel cell, the scheme provided by the invention can realize two functions of water removal and humidification, and liquid water separated from a baffle in a gas-water separation device in the water removal process is stored and supplemented to an ejector when the fuel cell membrane is dry and needs to be humidified. Liquid water inthe electric pile tail gas is fully recycled, so that the environmental adaptability of a humidifying system to a water shortage condition and a low-temperature condition is improved. Liquid water issucked into a mixing chamber through high-pressure hydrogen and the ejector, and extra system power consumption increased by humidifying devices such as an atomizing nozzle and an ultrasonic atomizeris avoided.

Description

technical field [0001] The invention belongs to the technical field of proton exchange membrane fuel cells, and in particular relates to a fuel cell anode water management system and a control method. Background technique [0002] Today's global environmental pollution and climate warming are becoming more and more serious, which has promoted the innovation of clean energy technology. Among them, the proton exchange membrane fuel cell (PEMFC) is considered as one of the most promising technologies due to its advantages of cleanliness, high efficiency, compactness and reliability. During the operation of the fuel cell, the proton exchange membrane needs to maintain a certain degree of humidity to ensure the proton conductivity. If the proton exchange membrane is too dry, the conductivity will decrease and the ohmic loss will increase. In severe cases, the membrane will be dehydrated, shrunk or even ruptured; on the contrary, if the water generated by the reaction cannot be r...

AI Technical Summary

Problems solved by technology

[0009] 1) Most systems regulate cathode humidity, and few technologies consider anode water management

[0010] 2) Only one of the two situations of humidification or dehydration is considered, and there are few technologies that realize both functions at the same time

[0011] 3) Most of the liquid water in the exhaust gas is directly discharged and not recycled

[0012] 4) Humidification devices such as atomizing nozzles and ultrasonic atomizers increase the extra power consumption of the system

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