基于常规超超临界机组热力系统(常规系统)，提出了取消中压缸抽汽，引入回热式小汽轮机抽汽的主循环(MC)系统的设计方案.以某超超临界1000 MW 机组为例，利用EBSILION软件对常规系统和 MC 系统进行机组变工况下热力学计算分析和比较.结果表明：采用MC系统的机组，在设计工况下，机组发电效率比常规系统提高0．15％，发电煤耗降低0．92 g/(kW�h)；在30％负荷下，机组发电效率比常规系统提高0．24％，发电煤耗降低1．61 g/(kW�h).因此，采用 MC 系统的超超临界机组具有良好的变负荷特性，且更适合于低负荷工况下的高效经济运行.%On the basis of thermal system in conventional ultra-supercritical power generation u-nits,a design scheme for a master cycle (MC)system was proposed.In this scheme,the steam ex-traction from the intermediate pressure (IP)cylinder is replaced by extracting steam from an add-ed regenerative small steam turbine.Taking an ultra-supercritical 1 000 MW unit as the example, the EBSILION software was applied to conduct thermodynamic and economic analysis for the con-ventional system and MC system under different working conditions.The results show that:the power generation efficiency of the unit applying the MC system is 0.15% and 0.24% higher than that using the conventional system,and the coal consumption rate is 0.92 g/(kW��h)and 1.61 g/(kW��h)lower,under design condition and 30% load condition,respectively.Thus,the ultra-supercritical unit employing MC system is more suitable to work under low-load working conditions.
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