建立了碳捕集系统仿真模型和热力系统变工况模型，提出添加和不添加小汽机的碳捕集耦合方式，并从热经济性和技术经济性上对比2种耦合方案。结果显示，不添加小汽轮机而尽量多地采用低段抽汽时，脱碳机组相对于原机组出力降低113.06 MW，发电效率降低7.79%，发电煤耗增加33.09 g/kWh，发电成本增加0.191元/kWh，脱碳成本为270.33元/kWh。添加小汽轮机后，碳捕集机组的净输出功提高43.45 MW，发电效率提高3.23%，发电煤耗降低28.55 g/kWh，发电成本降低0.034元/kWh，捕碳成本降低48.58元/t。综上，添加小汽轮机从热经济性和技术经济性上占有优势。

The simulation model for carbon capture system and the variable condition model for thermodynamic system in power plant are established.Two coupling methods of the carbon capture systems with and without small turbine are proposed and their heat economics and technical economics performances are analyzed and compared.It is found that if the coupling method is not added with small turbine but extract as much as possible steam from the low section turbine,the output power of the carbon capture unit drops by 113.06 MW than the original unit,the power generation efficiency decreases by 7.79%,the coal consumption increases by 33.09 gram per kWh,the power generation cost rises by RMB 0.191 per kWh and the carbon capture cost is RMB 270.33 per kWh.If adding a small turbine to the carbon capture unit,its net output power increases by 43.45 MW than the original unit,the power generation efficient increases by 3.23%,the coal consumption reduces by 28.55 gram per kWh,the generation cost reduces by RMB 0.034 per kWh and the carbon capture cost drops by RMB 48.58 per ton of CO₂.In conclusion,the coupling method adding by small turbine performs better in both heat economics and technical economics than that without small turbine.