초록 ▼

It is presently customary in a high-temperature fuel-cell system to divide the cathode waste gas, in particular, into two subflows, of which one is recirculated again to the cathode and the other is removed for heat utilization. The bifurcation is carried out at relatively high technical costs at ab

It is presently customary in a high-temperature fuel-cell system to divide the cathode waste gas, in particular, into two subflows, of which one is recirculated again to the cathode and the other is removed for heat utilization. The bifurcation is carried out at relatively high technical costs at about the operating temperature of the fuel cell at the gas outlets themselves. In order to reduce that cost, the entire cathode waste gas is fed through a heat exchanger to a bifurcation having two branch pipes. The first branch pipe opens through an air addition point and the heat exchanger into the cathode and the second branch pipe opens into a temperature-increasing device. In this way, a bifurcation of the hot cathode waste gas is avoided and the heat of the entire cathode waste gas is used to heat the cathode waste gas subflow fed back into the cathode. The invention can preferably be used, in particular, for fuel cells having operating temperatures above 600.degree. C. Such fuel cells are the molten carbonate fuel cell and the solid electrolyte fuel cell.

대표청구항 ▼

[ We claim:] [1.] A fuel-cell system, comprising:at least one fuel-cell block having an anode section and having a cathode section producing cathode waste gas;a waste gas pipe starting from said cathode section and carrying all of the cathode waste gas;a heat exchanger through which said waste gas p

[ We claim:] [1.] A fuel-cell system, comprising:at least one fuel-cell block having an anode section and having a cathode section producing cathode waste gas;a waste gas pipe starting from said cathode section and carrying all of the cathode waste gas;a heat exchanger through which said waste gas pipe extends; anda bifurcation to which said waste gas pipe extends, said bifurcation having first and second branch pipes, said first branch pipe having an air addition point, passing through said heat exchanger and opening into said cathode section, said first branch pipe also having a further heat exchanger and a circulating fan downstream of said further heat exchanger, between said bifurcation and said air addition point, and said air addition point receives air through said further heat exchanger.