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Coal‐gas‐burning high‐efficiency power plant which recovers generated carbon dioxide
Author(s) -
Pak Pyong Sik,
Nakamura Ken'Ichi,
Suzuki Yutaka
Publication year - 1991
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/eej.4391110505
Subject(s) - combustor , steam electric power station , boiler (water heating) , power station , combined cycle , exhaust gas , superheated steam , thermal power station , thermal efficiency , coal , combustion , heat recovery steam generator , waste management , natural gas , surface condenser , combustion chamber , engineering , chemistry , turbine , mechanical engineering , electrical engineering , organic chemistry
This paper describes the characteristics and construction of a coal‐gas‐burned high efficiency power plant which emits no carbon dioxide (CO 2 ) into the atmosphere. In a plant, CO 2 gas and superheated steam are used as the main and the secondary working fluids, respectively, of a closed dual fluid regenerative gas turbine power plant. Since coal gas composed of CO, H 2 , CO 2 and CH 4 is burned in a combustor using oxygen, the exhaust gas let into a condenser includes only CO 2 and H 2 O. Hence, CO 2 gas can be easily separated at the condenser outlet from condensate. In the plant, the combustion gas is first used to generate power by driving a turbine. High‐temperature turbine exhaust gas is next utilized at a regenerator to heat the main working fluid of CO 2 gas flowing into the combustor, and then is utilized at a waste heat boiler to produce the superheated steam injected into the combustor. It is estimated that the power can be generated with gross thermal efficiency of 54.4 percent, and that the power generating efficiency is 46.7 percent. Generating efficiency is calculated by subtracting the power required for producing the high‐pressure oxygen used for combustion from the generator output. It is shown that the estimated efficiency is higher by 18.1 percent than that of a conventional boiler steam turbine power generating plant into which a process for removing and recovering CO 2 from the stack gas by utilizing alkanolamine‐based solvent is integrated.