130t/h四角切圆锅炉改造和数值模拟  

Numerical Simulation and Retrofit of 130t/h Tangentially Boiler

作　　者：王宏武[1] 孙保民[1] 康志忠[1] 

机构地区：[1]华北电力大学电站设备状态监测与控制教育部重点实验室

出　　处：《电站系统工程》2013年第4期15-18,共4页Power System Engineering

摘　　要：某电厂的130 t/h锅炉在实际运行中,由于煤质不稳定,存在着炉膛水冷壁区域结渣严重,锅炉着火和燃烧稳定性差等问题。采用k-Ω湍流模型对水平浓淡燃烧器进行数值模拟,浓测煤粉浓度和淡测煤粉浓度的比值约为1.5,利用水平浓淡燃烧器技术控制煤粉流向,可以改善炉内燃烧。使用可实现k-ε双方程模型,对该四角切圆燃烧锅炉改造前后炉内燃烧工况进行数值模拟,计算结果表明炉内整体温度水平降低,燃烧器截面温度降低,可以使煤灰颗粒不易融化,在炉壁上结渣的几率降低。通过安装水平浓淡煤粉燃烧器和去除一定面积卫燃带对该锅炉进行改造,改造后该锅炉可在80 t/h时能稳定燃烧,炉膛结渣程度降低,锅炉参数稳定。Poor coal quality causes problems in some 130t/h boiler, including furnace slag, poor fire stability and unstable combustion. The process of a horizontal bias burner is numerically studied with k- Ω turbulence model, the concentrated ratio is 1.5. Using the horizontal bias burner control the flow of pulverized coal, can improve the combustion in furnace. The effects of retrofit on combustion process in furnace are investigated through particular numerical simulations with realizable k- e model. The calculation results show that the level of furnace and combustor section temperature reduce, the decreasing temperature can make the ash particles hard to melt and the probability of slag on the furnace wall reduce. Through the installation of horizontal bias burner and the removal of a certain area of refractory belt scheme, the boiler can combust stability in 80t/h and the slag degree reduces and the boiler parameters are stable.

关 键 词：水平浓淡燃烧器 锅炉改造 结渣 数值模拟 

分 类 号：TK264.12[动力工程及工程热物理—动力机械及工程]