A pem fuel cell power generation device with tail gas energy recovery function

Abstract

The invention discloses a PEM fuel cell power generation device with a tail gas energy recovery function. The PEM fuel cell power generation device comprises a fuel cell stack, a hydrogen storage tank, an air compressor, a storage battery, a water electrolysis tank, an oxygen buffer tank, a residual hydrogen buffer tank, a hydrogen booster pump, a turbine mechanism, a power generator and a gas distributor; a gas guide trench is formed in the surface of a bipolar plate of the fuel cell stack; the gas guide trench is of a hexagonal structure; a plurality of guide ridges are distributed in the gas guide trench in parallel; a gap between every two adjacent guide ridges forms a main guide groove; each guide ridge is composed of a plurality of triangular convex blocks arranged linearly; every two adjacent triangular convex blocks are inverted relative to each other; and a gap between every two adjacent triangular convex blocks forms a branch guide groove. With the PEM fuel cell power generation device of the invention adopted, the recovery and utilization of tail gas energy can be realized; the current density uniformity and power density of an PEM fuel cell are effectively improved through the improved guide trench structure of the bipolar plate in the fuel cell stack, and therefore, the performance of the PEM fuel cell is improved.

Description

technical field [0001] The invention belongs to the technical field of PEM fuel cells, in particular to a PEM fuel cell power generation device with tail gas energy recovery function. Background technique [0002] The working process of PEM (proton exchange membrane) fuel cell is equivalent to the reverse process of water electrolysis. As a single cell, it is composed of anode, cathode and proton exchange membrane. Both contain catalysts to accelerate the electrochemical reaction of the electrode, and the proton exchange membrane is used as an electrolyte, which is equivalent to a DC power supply when it works as a single cell. The anode of the single cell is the negative electrode of the power supply, and the cathode of the single cell is the positive electrode of the power supply. When the PEM fuel cell is used as a power supply in practical applications, it is necessary to stack multiple single cells in series to form a fuel cell stack whose output voltage meets the actua...

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Problems solved by technology

[0003] However, traditional PEM fuel cells still need to be improved in terms of current density uniformity and power density, and the recovery and recycling of exhaust energy are rarely considered in the power generation process

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