| 摘要 |
PURPOSE:To increase a power generating efficiency by removing carbon dioxide gas from the gas exhausted from an anode, returning the gas to the anode through a reformer, and supplying the carbon dioxide gas to a cathode together with air. CONSTITUTION:Gas exhausted from an anode 3 contains CO2 and H2O generated in a fuel cell in addition to unused CH4, H2, and CO. Most of the gas is supplied to a reformer 5 through an anode outlet gas branch line 10, and part of it is supplied to an absorbing tower 13a of a carbon dioxide gas separation unit 13 from an anode outlet gas line 9 through a cooler 11 and a condenser 12. Most of the carbon dioxide in the gas supplied to the absorbing tower 13a is removed, and residual gas containing CH<4>, H2 is taken out from the absorbing tower 13a through a residual gas line 14, and preheated with a residual gas heater 15, then supplied to the upper stream of a heater 6, reformed to fuel gas with the reformer 5, and supplied to the anode 3 of a fuel cell 1 to use for cell reaction. |
