MOLTEN CARBONATE TYPE FUEL CELL POWER GENERATION-EXHAUST GAS RECOVERY COMBINED SYSTEM USING BY-PRODUCT GAS IN PRODUCTION OF IRON

摘要

PROBLEM TO BE SOLVED: To provide a gas with-global-warming-effect fixing type energy saving system for utilizing carbon dioxide transport ability of a molten carbonate type fuel cell, to recover and fix carbon dioxide concentrated in an anode exhaust gas, while supplying two kinds of by-produced gases in iron production as gases for anode and cathode electrodes of the molten carbonate type fuel cell so as to attain highly efficient power generation. SOLUTION: A coke oven gas COG or its steam-reformed gas out of by-produced gases in iron production is used for gas supplied to an anode, combustion exhaust gas of a blast furnace gas BFG after regulated to a prescribed carbon dioxide/oxygen concentration ratio is used for gas supplied to a cathode, and they are supplied separately to a molten carbonate fuel cell MCFC to attain highly efficient power generation, so that iron production by-product gas effectively utilized type energy saving power generation is realized. Carbon dioxide concentrated in the anode is isolated and recovered with low energy by utilizing carbon dioxide transport ability of the molten carbonate type fuel cell MCFC to be utilized for a raw material for existing chemicals so as to be fixed as chemical substances, thereby cross-industrial type process efficiency ranging over iron production-chemistry is improved, and discharge of gases having global warming effect can be reduced at the same time.