Brennstoffzellensystem und Steuerverfahren eines Brennstoffzellensystems

摘要

A fuel cell system includes an evaporator 80 composed of a cross type heat exchanger 16 adapted to produce fuel containing steam and methanol vapor that are evaporated with heating gas 18 exhausted from a combustor 20. The evaporator 80 has first and second heat exchanger sections 88 and 89 having respective evaporating heat transfer surfaces, and first and second liquid sump sections 82a and 84a formed in the vicinities of the respective heat transfer surfaces and having variable volumes, respectively. The evaporator 80 includes first and second volume control devices 90 and 92 that control the volumes of the liquid sump sections 82a and 84a such that fuel vapor is produced at a demanded amount to meet load variations of a vehicle.