Fuel cell anode intermittent hydrogen exhaust system and its control method

Abstract

The invention discloses an intermittent hydrogen discharge system for an anode of a fuel system and a control method of the intermittent hydrogen discharge system. The control method comprises the following steps: monitoring the voltage of a fuel cell stack and the hydrogen concentration of an anode outlet of the fuel cell stack in real time; when determining that a voltage drop value of the fuel cell stack during the period of closing anode hydrogen discharge is greater than a preset voltage drop threshold, controlling starting discharging hydrogen at the anode outlet of the fuel cell stack; and when determining that the hydrogen concentration of the anode outlet of the fuel cell stack is smaller than a preset nitrogen concentration threshold, controlling stopping discharging the hydrogen at the anode outlet of the fuel cell stack. According to the hydrogen discharge system and the control method thereof, the hydrogen utilization efficiency of the fuel cell system can be improved on the basis of maintaining the stability of the voltage of the fuel cell stack.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a fuel cell anode intermittent hydrogen exhaust system and a control method thereof. Background technique [0002] Proton Exchange Membrane Fuel Cell (PEMFC) is considered to be the cleanest and most efficient new energy power generation device due to its environmental friendliness, high energy conversion rate and fast response. The service life of fuel cells and their systems is an important factor affecting their commercial development, especially for vehicle fuel cell systems. Among them, the design method of the fuel cell anode hydrogen exhaust system has a great influence on the attenuation of the performance of the fuel cell stack. In the actual operation of PEMFC, a large amount of liquid water generated by the reaction of hydrogen and oxygen exists in the cathode channel, part of the liquid water flows out of the stack with the air, and the other part diffuses to the ...

AI Technical Summary

Problems solved by technology

If the regular discharge method is adopted, on the one hand, liquid water is difficult to discharge under the action of the surface tension of the flow channel and the diffusion layer; on the other hand, it will often cause waste of hydrogen, resulting in low utilization efficiency of hydrogen

Therefore, intermittent hydrogen removal is widely used as a method for anode hydrogen removal, but how to determine the duration and interval of hydrogen removal has always been a difficult point in the industry

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