低压省煤器性能评价试验与节能效果的修正计算方法  

Performance Evaluation Test of Low-Pressure Economizer and Corrected Calculation Method of Energy Saving Effect

作　　者：王学栋 姜明超 宋昂 WANG Xuedong;JIANG Mingchao;SONG Ang(Huadian Electric Power Research Institute Co.,Ltd.,Hangzhou 310030,Zhejiang Province,China)

机构地区：[1]华电电力科学研究院有限公司,浙江省杭州市310030

出　　处：《发电技术》2021年第2期280-287,共8页Power Generation Technology

摘　　要：燃煤机组锅炉尾部烟道中的低压省煤器能够降低锅炉排烟温度,起到节能降耗的作用,但节能效果的影响因素众多,使得低压省煤器的性能鉴定与分析评价存在着不确定性。在某220 MW机组上进行了4个电负荷条件下,不同低压省煤器运行方式、运行参数,共24个工况的节能效果评价试验。利用热力性能试验法,以及拟合的汽轮机主蒸汽流量与低压省煤器节能效果曲线,计算了低压省煤器的节能效果。在4个电负荷对应的主蒸汽流量下,低压省煤器的节能效果分别为116.8、96.7、108.2、99.1 kJ/(kW×h)。通过变化低压省煤器的运行参数,得到不同电负荷工况下低压省煤器节能效果的变化范围。根据低压省煤器的热平衡方程和传热方程,计算其设计换热量和实际换热量,利用等效焓降法修正计算了低压省煤器运行参数对节能效果的影响。220 MW试验工况下,节能效果的试验值为116.8 kJ/(kW×h),参数修正后为190.97 kJ/(kW×h)。The low-pressure economizer installed in the tail flue of coal burning boiler can reduce temperature of boiler discharge smoke,thus saving energy and reducing consumption.There are many factors affecting the energy saving effect of low-pressure economizer,which makes the performance evaluation and analysis uncertain.Performance evaluation test of energy saving effect of low-pressure economizer was carried out on a 220 MW unit.Under 4 electrical loads,a total of 24 conditions were tested with different operating modes and operating parameters of the low-pressure economizer.Using thermal performance test method,and the fitted curve of steam turbine main steam flow with energy saving effect,the energy saving effect of low-pressure economizer had been calculated.Under main steam flow corresponding to 4 electrical loads,the energy saving effect was 116.8,96.7,108.2 and 99.1 kJ/(kW×h),respectively.By changing operating parameters of the low-pressure economizer,variation range of energy saving effect under different electric load conditions was obtained.According to heat balance equation and heat transfer equation,design heat transfer amount and actual heat exchange amount of the low-pressure economizer were calculated.The impact of operating parameters of low-pressure economizer on energy saving was calculated by using the equivalent enthalpy drop method.Under 220 MW test condition,the test value of energy saving effect was 116.8 kJ/(kW×h),and was 190.97 kJ/(kW×h)after parameter being modified.

关 键 词：汽轮机组 低压省煤器 性能试验 节能效果 节能评价 

分 类 号：TK223.33[动力工程及工程热物理—动力机械及工程] TM621[电气工程—电力系统及自动化]