METHOD AND ARRANGEMENT TO CONTROL THE HEAT BALANCE OF FUEL CELL STACKS IN A FUEL CELL SYSTEM

摘要

The invention relates to a method to control the heat balance of fuel cell stacks (6) in a fuel cell system (1), said fuel cell system (1) including at least one fuel cell unit (5) comprising fuel cell stacks (6), whose fuel cells (2) include an anode side (7) and a cathode side (8), as well as an electrolyte (9) interposed therebetween, and a recuperator unit (29) for heat exchange for preheating a supply flow (14) of the cathode side (8). In the method, a desired portion is separated from the fuel exhaust flow coming from the anode side (7) and adapted to be mixed with the cathode side (8) exit flow (15) before said recuperator unit (29). The invention relates also to a fuel cell system implementing the method.