360 MW机组贫煤锅炉燃用高挥发分煤种的研究与工程应用  

Research and Engineering Application of Burning Bituminous Coals with High Volatile Content in a 360 MW Lean Coal-fired Boiler

作　　者：曹嘉乐 欧妙 高振 孙路石[1] CAO Jiale;OU Miao;GAO Zhen;SUN Lushi(State Key Laboratory of Coal Combustion,Huazhong University of Science and Technology,Wuhan,China,430074;Guangxi Investment Group Laibin Power Generation Co.,Ltd.,Laibin,China,546138)

机构地区：[1]华中科技大学煤燃烧与低碳利用全国重点实验室,湖北武汉430074 [2]广西投资集团来宾发电有限公司,广西来宾546138

出　　处：《热能动力工程》2024年第12期95-103,共9页Journal of Engineering for Thermal Energy and Power

摘　　要：为适应某电厂360 MW机组贫煤锅炉安全高效燃用高挥发分煤种的要求,本文在煤质分析和热重实验的基础上分析了烟煤、褐煤及其混合煤种的着火、燃尽和结渣等燃烧特性,通过对机组制粉、燃烧、风烟等主要系统设备燃料适应性的研究,提出了“钢球磨煤机炉烟干燥-乏气/热风复合送粉技术”改造方案。热态试验结果表明:技术改造后机组系统设备可根据燃用煤质实现灵活切换,显著提升了机组的燃料适应性;在全烧烟煤及烟煤掺烧褐煤的不同负荷工况下,机组各系统运行安全稳定,各运行参数均满足设计要求,锅炉热效率达到92%以上,炉膛出口NO_(x)质量浓度大幅下降,实现了机组40%负荷下稳燃要求,技术改造在安全、经济及环保方面取得了显著的效果。In order to meet the requirements of safe and efficient combustion of high volatile coal in a 360 MW unit lean coal-fired boiler,the ignition,burnout and slagging characteristics of the bituminous coal,lignite and its mixed coal types were studied on the basis of coal quality analysis and thermogravimetric experiment.Through the research on the fuel adaptabilities of main systems such as coal pulverizing system,combustion system,air and flue gas system,the transformation scheme was put forward,which was conducted with a ball mill using flue gas drying,exhaust-air and hot air composite powder feeding technology.The hot-state experimental results show that the system equipment of the unit can be flexibly switched according to the coal quality after transformation,which significantly improves the fuel adaptability.All systems of the unit operate safely under different load conditions of fully burned bituminous coal and bituminous coal mixed with brown coal,and all operating parameters meet the design requirements.The thermal efficiency of the boiler is more than 92%,the NO_(x) mass fraction at the furnace outlet is greatly reduced,and the requirement of stable combustion under 40% load of the unit is realized.The technical transformation has achieved remarkable effect on safety,economic and environmental protection.

关 键 词：贫煤锅炉 高挥发性煤种 燃烧特性 煤种适应性 锅炉热效率 

分 类 号：TK223[动力工程及工程热物理—动力机械及工程] TK16