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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。
In the actual operation of a 130 t / h boiler in a power plant, due to the instable quality of coal, there are some problems such as severe slagging in the boiler water wall region, poor boiler fire and poor combustion stability. The k-Ω turbulence model was used to simulate the horizontal and the lean burners. The ratio of concentrated pulverized coal concentration to light pulverized coal concentration was about 1.5. By controlling the flow of pulverized coal by means of horizontal and lean burners, the combustion in the furnace could be improved. The k-ε two-equation model can be used to simulate the combustion in the furnace before and after the transformation of the tangentially fired boiler. The calculation results show that the overall temperature of the furnace is reduced and the temperature of the cross section of the burner is reduced, which makes the ash particles difficult to be obtained. Melting, the risk of slagging on the furnace wall is reduced. The boiler is modified by installing a horizontal pulverized coal burner and a deflagration belt with a certain area. After retrofitting, the boiler can be stably burned at 80 t / h, the slagging of the furnace is reduced, and the boiler parameters are stable.