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Abstract:

Abstract. This paper describes a construction and characteristics of a coal-gas-burning high eciency power plant which emits no carbon dioxide (CO 2) into the atmosphere. In the plant, CO 2 gas and superheated steam are used as the main and sub working uid, respectively, of a closed dual uid gas turbine power generation system. It is assumed that a coal gas whose principal compositions are CO, H2, CO2 and CH4 is burnt in a combustor using oxygen, and that CO 2 gas and superheated steam are used as the main and sub working uid of a turbine, respectively. Consequently, the constituent gases of the combustion gas become CO2 and H2O. Thus, CO2 gas included in the exhaust gas can be easily separated at the condenser outlet from the condensate (H2O). Most of recovered CO 2 is recycled as the main working uid of the turbine. In the plant, high-temperature turbine exhaust gas is utilized in a waste heat boiler to produce superheated steam which is injected into the combustor in order to improve power generation eciency. It has been estimated that an electric power of 208 MW can be generated with gross thermal eciency of 51.3 %. Power generating eciency has been estimated to be 43.7 % since the electric power of 31.1 MW is required for producing the oxygen for combustion. The problem of liquefying CO2 recovered has also been dealt with in the paper. It has been shown that the resultant power generating eciency is estimated to be 39.0 % if the power for liquefaction of recovered CO 2 is taken into account.

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