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为了降低化学吸收法捕集CO2对燃煤–捕碳机组热经济性的削弱作用,以某660MW二次再热机组为例,设计了一种带捕碳汽轮机的改进二次再热燃煤–捕碳热力系统集成型式;推导了该系统的通用性热经济性计算框架并建立了系统参数优化模型.应用动态自适应粒子群算法优化计算表明:改进设计的燃煤–捕碳机组与常规燃煤–捕碳机组相比,热经济性和减排效果明显提高,供电标准煤耗率下降了12.21g/(kW?h),CO2排放率下降了4.07g/(kW?h);与未捕碳机组相比,CO2排放率下降了576.15g/(kW?h).捕碳汽轮机可以有效减少热力系统的损失,对二次再热燃煤–捕碳机组具有显著的降耗效应.“,”Integrating a coal-fired power plant with post-combustion CO2 capture based on chemical absorbent incurs serious efficiency and energy penalty. This study aims to provide insights into the design of full-scale post-combustion CO2 capture for a new double reheat power plant. Taking the 660MW double reheat unit as an example, a modified thermal system structure including a carbon capture turbine was presented for the double reheat power plant with CO2 capture. The versatile scheme for calculating the thermal economy and the thermal system parameter optimization model were set up. The dynamic adaptive particle swarm optimization was applied for the modified thermal system parameters optimization. Results indicate that the thermal efficiency and CO2 emission of the newly-designed unit have been obviously improved. The standard coal consumption rate for power supply has reduced 12.21g/(kW?h) and the CO2 emission rate has reduced 4.07g/(kW?h) compared with the conventional retrofitted unit. The CO2 emission rate has reduced 576.15g/(kW?h) compared with the conventional coal-fired unit. The carbon capture turbine can play an important role in effectively reducing the system exergy loss, and have significant energy-saving effect for the double reheat coal-fired power plants with post-combustion carbon capture.