燃煤发电机组锅炉余热利用系统探讨  

Discussion on Waste Heat Utilization System of Coal-Fired Utility Boilers

作　　者：刘宇钢 易广宙 

机构地区：[1]清洁燃烧与烟气净化四川省重点实验室,四川成都611731 [2]东方电气集团东方锅妒股份有限公司,四川自贡643001

出　　处：《中国电力》2016年第10期1-6,共6页Electric Power

基　　金：“十二五”国家科技支撑计划项目(2015BAA03B01)~~

摘　　要：中国火力发电企业对煤耗的要求已经到了毫克必争的阶段。为了深度回收锅炉尾部烟气余热进而提升机组效率,对4种典型的燃煤机组锅炉尾部余热利用系统进行介绍。以某660MW超超临界机组工程为例,采用等效焓降法,对3种余热利用系统的节能效果进行分析,结果表明:冷风加热器+空气预热器烟气旁路系统的节能效果最佳,其节约煤耗约3.7g/(kW·h)。In recent years, it has been highly required for China＇s thermal power generation enterprises to reduce coal consumption rate to the stage with the accuracy up to milligrams. For the sake of improving the unit efficiency by deeply recovering the waste heat of boiler flue gas, the characteristics of four kinds of coal-fired boiler waste heat utilization system are introduced. Taking a 660-MW USC unit for example, the energy-saving effect of three waste heat utilization systems are analyzed by equivalent enthalpy drop method. The result shows that the cold air heater plus air heater flue gas bypass system has the best energy-saving effect with the coal consumption reduction of about 3.7 g/（kW·h）.

关 键 词：燃煤发电 余热利用 烟气冷却器 水媒式烟气-烟气换热器 冷风加热器 空气预热器烟气旁路 

分 类 号：TM621[电气工程—电力系统及自动化] TK11[动力工程及工程热物理—热能工程]