Fuel-circulating fuel cell system

摘要

A fuel cell stack 1 in a fuel-circulating fuel cell system is supplied with fuel and an oxidizing agent to generate electricity. The fuel discharged from the fuel cell stack 1 is supplied to the fuel cell stack 1 again through a fuel-circulating passage 6. In the fuel-circulating passage 6 is provided a fuel pump 3 powered from an outside source to circulate the fuel through the fuel-circulating passage 6 at a predetermined circulation rate. An ECU 4 transmits an output instruction value to the fuel cell stack 1 and regulates a circulation rate of the fuel in the fuel-circulating passage 6 according to the output instruction value.