Coal - Gas system with CO₂ capture - Technical and economic analysis

Chemical absorption is an effective and often used method of gas separation in chemical industry. This method is also often taken into account when considering systems of carbon capture from flue gases of coal fired power plants. This process is very energy-intensive and significantly reduces the performance of the power plant. Thus it seems appropriate to seek external sources of heat for the purpose of carbon capture installation. In the paper, the integration of a coal-fired power plant with the gas turbine combined heat and power system for carbon capture and storage (CCS) installation has been analyzed. The parameters of the gas unit, which fully meets the needs of CCS for the 900 MW coal power plant with supercritical parameters, have been determined. There have been examined two variants of the gas unit: natural gas fired gas turbine with water boiler and natural gas fired gas steam cycle with 1-pressure heat recovery steam generator. The parameters of these analysis have been compared with parameters of power plant working without an external heat source. Specified rate of avoided emissions, and economic analysis of the project have been determined.