Air-side oxygen-enriched circulating device for fuel cell power generation system

The invention provides an air-side oxygen-enriched circulating device for a fuel cell power generation system, belongs to the technical field of fuel cells, and solves the problem that a cathode oxidant cannot be effectively utilized in the prior art. The device comprises an air circulation branch, a controller, an air compressor air supply branch and an oxygen storage tank air supply branch, and an air compressor is arranged on the air compressor air supply branch. And an oxygen storage tank, a pressure reducer and a cathode ejector are sequentially arranged on the oxygen storage tank gas supply branch. The air circulation branch is sequentially provided with a tail exhaust back pressure valve, a water segregator and an electromagnetic valve V1. A wet gas inlet of the water segregator is connected with an air tail gas outlet of the electric pile through a tail gas discharge back pressure valve, one path of a dry gas outlet is connected with a drainage inlet of the cathode ejector, and the other path is conne