基于背压汽轮机供热改造技术的节能效果试验研究  

Experimental Study on Energy Saving based on Heating Retrofit Technology of Back-pressure Turbine

作　　者：王斌 李志炜 谭锐 谭宏 冯知正 张洪涛 杜清华 殷戈 WANG Bin;LI Zhi-wei;TAN Rui(Guodian Nanjing Electric Power Test and Research Co.,Ltd.;Guodian Quanzhou Thermal Power Company Limited)

机构地区：[1]国电南京电力试验研究有限公司,江苏南京210046 [2]国电泉州热电有限公司 [3]国电龙源节能技术有限公司

出　　处：《电站系统工程》2021年第5期54-56,60,共4页Power System Engineering

摘　　要：针对某亚临界330 MW等级电厂供热蒸汽参数等级较高,存在能级不匹配的现象,采用供热抽汽驱动背压汽轮机组发电并且排汽预加热热网循环水的方案进行改造,优化供热系统。针对改造后的热力系统,综合考虑改造后厂用电率下降和供热抽汽量上升两个因素,建立分析理论模型,利用试验测量背压机供热运行数据,进行背压机改造方案节能效果分析。试验结果表明:供热背压机额定出力情况下,总厂用电率下降1.59%,使机组供电煤耗降低5.42 g/(kW·h)。因增加背压汽轮机导致供热抽汽流量增加10.04 t/h,使供电煤耗升高0.87 g/(kW·h)。综合上述因素,采用背压汽轮机后,实际供电煤耗降低4.56 g/(kW·h),节能效果显著。In view of the phenomenon that the parameter level of the heating steam was higher and the energy level was mismatching in a sub-critical 330 MW power plant, a modification scheme of heating steam to drive back-pressure steam turbine unit to generate electricity and exhaust steam to preheat circulating water of heat supply network was adopted. An analysis theoretical model was established for the reformed thermal system by comprehensively considering two factors:the decrease of power consumption rate and the increase of heating extraction flow. The energy saving effect of the modification scheme of the back pressure machine was analyzed based on the test data of the heating operation. The test results showed that: under the rated condition of the back pressure machine, the total power consumption rate was reduced by 1.59%, and the net coal consumption rate of the unit was reduced by 5.42 g/(kW·h). The heating supply steam extraction flow was increased by 10.04 t/h due to the addition of back-pressure steam turbine, and thus the net coal consumption rate was increased by 0.87 g/(kW·h).Based on the above factors, the actual net coal consumption rate was reduced by 4.56 g/(kW·h) after adopting back-pressure steam turbine, and the energy saving effect was remarkable.

关 键 词：供热改造 背压汽轮机 厂用电率 节能 

分 类 号：TK267[动力工程及工程热物理—动力机械及工程]