LAUSR

Abstract The supercritical CO2 Brayton power cycle is well known as a promising power generation technology, and researches for applying it to various applications are being actively carried out. In this study, performance analysis of coal-fired power plant combined with supercritical CO2 Brayton power cycle was performed. If various existing supercritical CO2 Brayton power generation cycles are applied to coal-fired power generation systems, the expected power generation efficiency and levelized cost of electricity (LCOE) are thoroughly estimated. In conclusion, it is expected that the power generation efficiency is improved by 6.2–7.4% compared to the steam Rankine cycle applied to the existing coal-fired power plant, and the LCOE of the coal-fired power plant combined with the supercritical CO2 Brayton cycle is reduced by about 7.8–13.6% compared to that of coal-fired power plant combined with steam Rankine cycle. In addition, design criteria for retaining the economic dominance were presented through sensitivity analysis of factors affecting O&M cost and capital cost.