35 t/h启动锅炉超温分析与技术改造  

Over-temperature analysis and technical transformation of 35 t/h auxiliary boiler

作　　者：李茂 游必超 后颖黎 王林[2] LI Mao;YOU Bichao;HOU Yingli;WANG Lin(Diandong Power Plant,Huaneng Yunan Diandong Energy Company Limited,Qujing 655508,China;Xi’an Thermal Power Research Institute Company Limited,Xi’an 710054,China)

机构地区：[1]华能云南滇东能源有限责任公司滇东电厂,云南曲靖655508 [2]西安热工研究院有限公司,西安710054

出　　处：《华电技术》2018年第12期13-15,77,共4页HUADIAN TECHNOLOGY

基　　金：国家科技支撑计划资助项目(2015BAA03B01)

摘　　要：为解决某机组启动锅炉点火后出现蒸汽超温引发频繁跳机的问题,结合现场运行数据确认低负荷下燃烧器出力过大、各级受热面吸热量不匹配为蒸汽超温的主要原因,在此基础上提出了包含燃烧器、减温水、炉膛烟道改造及炉内燃烧调整的综合方案。通过增设燃烧器回油旁路增大回油量,降低了油枪出力;利用二次风旋流挡板调整火焰形状,增加水冷壁吸热量;通过实施炉膛烟道改造,重新分配烟气流量,减少过热器吸热量;更换大孔径减温水喷嘴,提高对蒸汽温度的控制能力。改造调整后,启动锅炉运行稳定,超温停机现象基本消除,蒸汽参数达到设计值,相关经验可供后续同类设备参考。In order to solve the frequent tripping caused by steam over temperature after the start up of a unit and ignition of the boiler,combined with the field operation data,it is confirmed that excessive output of the burner under low load and the mismatching of heat absorption on different levels heating surface are the main reasons for the overheating of the steam.Accordingly,a comprehensive plan including burner,desuperheating water,furnace flue modification and furnace combustion adjustment is proposed.By adding a burner back leakage bypass,back leakage can be increased and nozzle output can be reduced.By using the secondary air swirl baffle and adjusting the flame shape,heat absorption capacity of the water wall can be improved.By implementing the furnace flue transformation and redistribution flue gas flow,the heat absorption of the superheater can be reduced.By replacing a large-aperture desuperheating water nozzle,the control of the steam temperature can be improved.After retrofit,startup of boiler is stable,and over-temperature shutdown is basically eliminated,and steam parameters of the boilers are basically reach the design value.Relevant experience can be used for reference by similar equipment in the future.

关 键 词：启动锅炉 超温 吸热量匹配 技术改造 燃烧调整 

分 类 号：TK229.3[动力工程及工程热物理—动力机械及工程]