Anode injection reflux device of fuel cell engine

Abstract

The invention discloses an anode injection reflux device of a fuel cell engine, and belongs to the technical field of fuel cell engines. The anode injection reflux device of the fuel cell engine comprises: a separator, which is used for separating liquid water and hydrogen, and is equipped with a gas outlet; an ejector, which is used for injecting hydrogen, and is connected with a nozzle at the end, wherein the nozzle comprises a flow guide section, a throttling section and an acceleration section which are connected in sequence, the flow guide section is connected with the end of the ejector,the diameter of the flow guide section is kept unchanged, and the diameter of the throttling section is gradually decreased in the direction close to the acceleration section; the diameter of the acceleration section is gradually increased in the direction away from the throttling section, so that the flow velocity of hydrogen at the joint of the throttling section and the acceleration section isgreater than 340m / s; and an injector, which is coaxially arranged with the acceleration section and communicated with each other, is communicated with the gas outlet, so that hydrogen entering the injector from the acceleration section can be sucked into the hydrogen at the gas outlet. The anode injection reflux device has the advantages that: the loss of hydrogen is small, and the reflux effectis good.

Description

technical field [0001] The invention relates to the technical field of fuel cell engines, in particular to an anode injection return device for fuel cell engines. Background technique [0002] In order to ensure the electrochemical reaction of the stack in the fuel cell engine, it is necessary to continuously supply high-purity hydrogen with a certain pressure and flow rate to the stack to participate in the electrochemical reaction; but during the working process of the stack, due to the incomplete reaction , resulting in part of the hydrogen not participating in the chemical reaction, if this part of the hydrogen is directly discharged into the atmosphere, it is not only a kind of pollution, but also a waste of hydrogen. [0003] In order to solve the above problems, a hydrogen circulation system is used to reuse the hydrogen that has not participated in the reaction, so as to improve the economy of the fuel cell engine. At present, the hydrogen circulation system mainly ...

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Problems solved by technology

[0004] However, the shape of the inner cavity of the nozzle in the current ejection and reflux device generally adopts a regular straight line segment, which causes the flow of hydrogen to be adversely affected at the corner of the inner cavity of the nozzle, resulting in a large amount of hydrogen loss and The hydrogen backflow effect is poor, and it cannot meet the hydrogen cycle requirements of high-power fuel cell engines, resulting in poor engine reliability

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