| 摘要 |
- a fuel cell stack (1) comprising a plurality of fuel cells (145) sandwiched between two end plates (130, 140); - a fuel supply system (60, 110, 113, 190) for supplying a stream of fuel gas to the fuel cell stack; - an oxidizer supply system (65, 120, 123, 195) for supplying a stream of oxidizer gas to the fuel cell stack; - a closed loop coolant circulation system for driving a cooling liquid through the fuel cell stack (1) in order that the cooling liquid enter the fuel cell stack, absorb heat from the fuel cells (145) and exit the fuel cell stack, the coolant circulation system comprising a circulation pump (72) for driving the cooling liquid, a heat exchanger (78, 80) for removing heat from the cooling liquid and for at least partially transferring the heat to the stream of fuel gas and/or the stream of oxidizer gas. The heat exchanger (78, 80) comprises a tube (203) made from a heat-conducting material and inserted into a bore in one of the end plates (130), the tube and the bore defining at least a first fluid channel inside the tube (203) and a second fluid channel (205, 207) in a space existing between the tube and the sides of the bore in the end plate (130, 140), one of said first and second fluid channels being for the cooling liquid, and the other fluid channel being for the fuel or the oxidizer gas. |
