Fuel cell hydrogen supply and return system and fuel cell

Abstract

The invention discloses a fuel cell hydrogen supply and return system and a fuel cell. The fuel cell hydrogen supply and return system comprises a cell stack hydrogen outlet pipe, a cell stack hydrogen inlet pipe, a water-steam separator, a purge valve, a hydrogen supply module and a hydrogen return pump; hydrogen-containing mixed gas is converged into the water-steam separator through the cell stack hydrogen outlet pipe so as to be subjected to primary water-steam separation; hydrogen separated by the water-vapor separator is connected to a hydrogen inlet of the hydrogen return pump through a manifold; a main pipe is provided with a climbing section, an outlet of the main pipe is connected to the hydrogen inlet of the hydrogen return pump; a branch pipe is branched from the bottom of the climbing section, and the outlet end of the branch pipe is connected with the purging valve. The hydrogen separated by the water-vapor separator undergoes secondary water-vapor separation when passing through the climbing section, and separated water drops converge to the branch pipe along the climbing section and are discharged from the purge valve. The system is compact in structure and small in size, effectively realizes water-vapor separation, reduces the risk of system stack flooding, discharges waste water and waste gas separately, and improves hydrogen economical efficiency and reliability.

Description

Technical field: [0001] The invention relates to a fuel cell hydrogen supply and return system and a fuel cell. Background technique: [0002] Proton exchange membrane hydrogen fuel cell is a high efficiency, high power density, zero emission power generation system, which has been widely used in various fields. The stack in the fuel cell system is composed of several battery cells stacked in series, and its normal operation requires dry, clean, and insulated environmental conditions. In order to ensure the working environment of the stack, most of the current fuel cell systems place the stack module in a box, and ensure that the box meets the protection requirements of IP67 through a sealed design. See the patent number: CN201920255608.7, the publication number: CN209312924U, and the patent name: a utility model patent for a fuel cell. [0003] At present, the hydrogen supply and return system of fuel cells lacks an effective water vapor separation mechanism: 1. Only the ...

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Problems solved by technology

[0004] An object of the present invention is to provide a fuel cell hydrogen supply and return system and a fuel cell to solve the lack of effective water vapor separation in the process of recycling and recovering the residual hydrogen output from the hydrogen outlet of the stack module of the fuel cell in the prior art equipment, resulting in high water content in the recovered hydrogen, unsatisfactory recovery, and technical problems that affect system performance

[0005] A further object of the present invention is to provide a fuel cell hydrogen supply and return system and a fuel cell to solve the unreasonable arrangement of components in the hydrogen supply and return system in the fuel cell in the prior art, resulting in long connecting pipelines and increasing the number of pipelines It is cumbersome to fix parts and components, and it increases the pressure drop of the hydrogen circuit of the system and the technical problems of large volume

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