Repowering a coal-fired power plant with a gas turbine to supply heat for the desorption process

This paper presents the results of an analysis for a 900MWsupercritical coal-fired power plant integrated with an absorption CO2 separation installation and a gas turbine unit. In this unit the gas turbine with evaporator is the heat source for the desorption process, which is realized in a CO2 separation installation. The aim of the analysis was to determine the thermodynamic, ecological and economic evaluation indicators, which are defined in the paper. Analyzes were carried out for the variable heat demand required for the desorption process. Additionally, the impact of a change in emission allowance price on selected economic evaluation indicators was analyzed.