CONCEPT FOR DRYING EXHAUST GAS OF A FUEL CELL SYSTEM UTILIZING THE LIQUID HYDROGEN AS A HEAT SINK

摘要

The invention relates to a system (2) for drying exhaust gases of a fuel cell system, comprising two heat exchangers (4, 6) alternately exposed to exhaust gas, freezing and accumulating water vapor from the exhaust gas by means of a coolant. A valve arrangement having a plurality of valves (160-169) is set up for operating one of the two heat exchangers (4, 6) in a freezing phase, and operating the other heat exchanger in a regeneration phase in which the accumulated ice melts and is discharged. Said system is particularly well suited for use in airplanes for drying an exhaust gas enriched with oxygen of a fuel cell system for tank inertisation.