Fuel cell system and anode control method

Abstract

The invention provides a fuel cell system and an anode control method, an anode flow channel of a galvanic pile comprises a hydrogen gas path for supplying gas to the galvanic pile, and the hydrogen gas path comprises a gas path first end and a gas path second end; pipelines at the first end and the second end of the gas path are simultaneously connected with a first three-way valve and a second three-way valve; the first three-way valve is communicated with a hydrogen source used by the galvanic pile; and when the galvanic pile of the anode works, the first three-way valve and the second three-way valve enable the hydrogen input end of the hydrogen gas path to be switched between the first end of the gas path and the second end of the gas path by switching the opening and closing states of all valve ports. In the blind end mode, the flow direction of the anode hydrogen is periodically changed, so that the phenomenon that impurities are accumulated at the downstream of the anode is improved, the phenomenon of insufficient local hydrogen supply of the fuel cell is reduced, and the frequency of discharging after the impurities are removed is reduced, so that the hydrogen dischargingfrequency in the blind end mode can be effectively reduced, and the utilization rate of the hydrogen is increased.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a fuel cell system and an anode control method. Background technique [0002] A fuel cell is a device that converts chemical energy stored in fuel and oxidant into electrical energy. The fuel cell is composed of a bipolar plate and a membrane electrode. Multiple fuel cell monomers are connected in series to form a fuel cell stack. The specific reaction process of the fuel cell is to inject hydrogen into the anode, and the hydrogen will undergo an oxidation reaction at the anode: H 2 -2e - =2H + ; Inject air into the cathode, and the oxygen in the air undergoes a reduction reaction at the cathode: O 2 +4H + +4e - =2H 2 O; In order to ensure the stable output of the fuel cell, the fuel cell system needs to include an air supply system and a hydrogen supply system. During operation, air is injected from the atmosphere to the cathode through a blower or an air compressor, an...

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Problems solved by technology

[0003] Removing anode impurities requires frequent opening of the anode discharge valve to discharge impurity gases. This operation will cause some hydrogen to be discharged together, reducing the utilization rate

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