为了研究燃煤发电机组机炉耦合系统的经济性，以某典型660 MW超超临界燃煤机组为例，建立了节煤收益与系统投资模型，对常规低压省煤器系统、采用暖风器的机炉耦合系统以及设置旁路烟道的机炉耦合系统等3种机炉耦合系统的经济性进行了对比分析。计算结果表明：在相同的边界条件下，3种机炉耦合系统的净节能效果分别可以达到1.60，2.64和3.32 g/(kW•h)，系统换热设备投资分别为530，1 146和1 177万元，系统的年节煤净收益分别达到了307，501和636万元；常规低压省煤器系统的投资最低，但是节能效果最差；采用暖风器的机炉耦合系统的节能效果有所提高，但是系统投资高；设置旁路烟道的机炉耦合系统的经济性最优。

In order to evaluate the economy of turbineboiler coupling system of coalfired power units,a typical 660 MW ultrasupercritical coalfired power unit was taken as the reference case,economic performances on three coupling systems,i.e.,conventional lowpressure economizer system,coupling system with air heater and coupling system with bypass flue,were analyzed comparatively by developing the models of coalsaving benefits and system investments.With the same boundary condition,the calculation results show that the net energysaving effects of the three types of boilers coupling systems can reach 1.60,2.64 and 3.32 g/(kW•h),respectively. The system investments for heat exchangers are 5.30,11.46 and 11.77 million yuan,respectively. The annual net coalsaving benefits of the system are 3.07,5.01 and 6.36 million yuan,respectively. Among three coupling systems,the conventional lowpressure economizer system has the lowest system investment,while the energysaving effect is the worst; both the system energysaving effect and the investment have increased in coupling system with air heater. The economic performances of boilerturbine coupling system with bypass flue is the best.

TK11+5

国家重点研发计划(2018YFB0604405)；国家自然科学基金（51776146)；四川省工业发展资金项目（川财建【2018】113号）