An 865 MW lignite fired CO2 free power plant -: A technical feasibility study

This work applies an O-2/CO2 concept to commercial data from an 865 MWe lignite fired reference power plant and large air separation units (ASU). The aim of the study is to identify essential components and energy streams of the two processes and investigate the possibilities for process integration. A detailed design of the flue gas treatment before transportation of the separated carbon dioxide is also proposed. The sulphur dioxide can be sequestered together with the carbon dioxide, provided that the gas is dry, and, consequently, there is no need for a desulphurising unit. Since the investment cost of an ASU is slightly lower than for the desulphurising unit, the investment cost of the O-2/CO2 plant will be slightly lower than for the reference plant. With all identified integration possibilities the net electrical efficiency becomes 34.3%, which is a reduction by 8.3 percent units compared to the reference plant.