Application of supercritical CO2 gas turbine for the fossil fired thermal plant

Abstract

A supercritical CO2 gas turbine cycle can be effectively applied not only for the nuclear reactor but also for the fossil fired power plant. Since an inlet temperature of heat source for this cycle is considerably high and the CO2 pressure is also very high, these become difficult design problems. An introduction of an economizer for the combustion gas leaving a CO2 heater and a double expansion turbine cycle are effective to solve these problems. A specific design of 300MWe plant is shown. As a result of system design, the cycle thermal efficiency became 43.4 %. For the heat exchangers such as the CO2 heater, the economizer and the recuperators, PCHE type heat exchanger is effective. The component designs for the CO2 heater, the economizer, S-CO2 turbines, compressors and the recuperators are shown.