褐煤干燥对电厂经济性的影响  

Economical effect of lignite coal drying on coal-fired electric power plant

作　　者：阎维平[1] 马凯[1] 李春启[2] 付志新[2] 佟义英 

机构地区：[1]华北电力大学能源与动力工程学院教育部电站设备状态监测与控制重点实验室,河北保定071003 [2]大唐国际化工技术研究院有限公司,北京100070 [3]大唐国际发电股份有限公司,北京100140

出　　处：《中国电力》2010年第3期35-37,共3页Electric Power

摘　　要：褐煤中水分较高,若直接用于电厂锅炉燃烧,将导致锅炉热效率和电厂净效率降低,经干燥后的褐煤燃烧对提高电厂经济性有很重要的意义。以某300MW燃煤粉锅炉机组为例,计算和分析了燃用干燥前与干燥后的褐煤时锅炉内燃烧、受热面换热、烟风系统阻力以及磨煤机出力的改变,得出褐煤干燥对锅炉热效率、燃煤量、风机电耗及制粉系统电耗的影响,对电厂燃用未经干燥及干燥后的褐煤的经济性进行了评价。燃用干燥后的褐煤不仅可大大减少入炉煤量,而且还可提高锅炉热效率,降低送、引风机及制粉系统等辅机的电耗。If lignite coal with high moisture content is used directly for the power plants burning, it will leads to reduce of boiler thermal efficiency and power plant net efficiency, it is very important to study the influence of lignite coal drying to the economic of power plant. Taking a 300 MW coal fired boiler as an example, the change of burning in boiler, heat exchanger on heating surface, smoke and ventilation system resistance and output capacity of coal milling are analyzed, and the influence of lignite coal drying to boiler thermal efficiency, coal consumption, fans and coal pulverizing system power consumption are obtained. Taking a 300 MW coal fired boiler as an example, the thermal analysis shows that burning of the dried lignite coal can not only significantly reduce the quantity of coal, but also improve the boiler thermal efficiency, reduce the power consumption of feed fan, induced fan, and coal pulverizing system. The power plant economics when burning lignite with and without drying ate evaluated, and the conclusion could offer a reference to the decision making of both the coal drying enterprise and power plant.

关 键 词：褐煤干燥 锅炉效率 经济性 

分 类 号：TM621.2[电气工程—电力系统及自动化]