HIGH EFFICIENCY FUEL CELL SYSTEM WITH ANODE GAS CHEMICAL RECUPERATION AND CARBON CAPTURE

摘要

A method of providing anode gas exhaust (38, 39) from a fuel cell stack (36) and carbon dioxide (54) capture by feeding reformed fuel and air into a fuel cell stack (36) where gas exhaust (38, 39) is fed to a series of oxidation/reduction beds (44, 46) to provide exit streams a) of H2O and CO2 (41′) which is fed to a condenser (52) to recover CO2 (54), and b) H2O and CO (48) which is recirculated to the fuel cell stack (36).

主权项

1. A method of providing anode gas exhaust chemical recuperation from a fuel cell stack as well as carbon dioxide capture, comprising the steps:
(a) feeding a fuel and optional water to a reformer to provide a reformed fuel stream consisting essentially of H2, CO and H2O; (b) feeding the reformed fuel as well as feeding air to a fuel cell stack containing a fuel electrode anode, and an air electrode and solid electrolyte between the electrodes, operating at a temperature over 600° C., to provide energy and anode gas exhaust containing at least H2, H2O and CO2; (c) feeding the anode gas exhaust to a first oxidation/reduction bed, containing a metal material, to provide a first redox exit stream consisting essentially of H2O and CO2 which is split into a first redox exit stream and a second redox exit stream; (d) feeding the first redox exit stream to a condenser to provide separate CO2 and H2O streams; and (e) feeding the second redox exit stream to a second oxidation/reduction bed, containing a metal material, to form a final redox exit stream comprising at least 65 vol. % H2 which final redox exit stream is recirculated back into the reformed fuel in step (a).