SYSTEM AND PROCESS FOR SEPARATION OF CO2 AND RECOVERY OF FUEL FROM ANODIC EXHAUST GAS OF MOLTEN-CARBONATE FUEL CELLS

摘要

A system (1) for separation of CO2 and recovery of fuel from anodic exhaust gas of molten- carbonate fuel cells includes at least one molten- carbonate fuel cell (5) operating under pressure and a device (8) for separation of CO2, supplied with anodic exhaust gas; the separation device (8) has at least two membrane separation stages (31, 32) set in series, provided with respective heat membranes. The stages of the device are obtained so as to originate at least three distinct flows: a flow basically constituted by the separated CO2; a flow containing the remaining portion of CO2 and the majority of the H2 present in the anodic exhaust; and a flow constituted prevalently by water vapour. The flow containing H2 is recirculated in the system by being sent to the burner associated to the system for conversion of the fuel for the cells, whereas the flow containing water vapour is sent directly to the turbine, by-passing the cells.