600MW烟煤锅炉掺烧褐煤问题分析及改造措施  

Analysis of Lignite Blending Combustion Typical Problem and Improvement Measures

作　　者：韩基文[1] 郭馨 王静杰[1,2] 于景泽[1,2] 殷亚宁[1,2] 徐彦辉 HAN Ji-wen;GUO Xin;WANG Jing-jie(Harbin Boiler Co.,Ltd.;State Key Laboratory of Efficient and Clean Coal-fired Utility Boilers(Harbin Boiler Co.,Ltd.))

机构地区：[1]哈尔滨锅炉厂有限责任公司,黑龙江哈尔滨150046 [2]高效清洁燃煤电站锅炉国家重点实验室(哈尔滨锅炉厂有限责任公司)

出　　处：《电站系统工程》2021年第2期43-45,共3页Power System Engineering

摘　　要：某600 MW机组超临界直流烟煤锅炉,掺烧褐煤后出现再热器减温水量大、NO_(x)排放浓度高等问题。通过制粉、燃烧系统摸底试验、燃烧调整等方法,分析了问题产生的原因。结果表明:掺烧褐煤后炉膛内燃烧存在一定程度的滞后,火焰中心整体有所抬高,导致了主燃烧器火焰与OFA的相对距离减小,再热器吸热量变大,而火焰在还原区的停留时间过短,一定程度上增加了NO_(x)排放。通过对燃烧器实际运行工况的计算,提出针对性改造方案并通过数值模拟、冷态试验等方法加以验证后,对该电厂实施了相应改造,改造后锅炉再热器减温水量明显下降,NO_(x)排放浓度也得到了有效控制。Some 600 MW unit supercritical dc bituminous coal boiler burning mixed with lignite, has the problem of large temperature reduction water and high concentration og NO_(x) emission. The reason of the problem is analyzed by means of powder making, combustion system experiment and combustion adjustment. The results show that combustion in the furnace is lagging behind to some extentafter blending, the center of the flame is elevated. This results in a decrease in the relative distance between the pulverized coal burner flame and OFA burner, the reheater absorbs more heat. And the residence time of flame in the reduction zone become very short, which increases NO_(x) to a certain extent. Based on the calculation of the actual operating condition of burner, the improvement measures are put forward. After numerical simulation and cold test verification, the corresponding transformation of the power plant was carried out. Temperature reduction water of reheater was decreased obviously, NO_(x) emission concentration was also effectively controlled.

关 键 词：褐煤掺烧 数值模拟 燃烧器改造 

分 类 号：TK16[动力工程及工程热物理—热能工程]