电站煤粉锅炉水平浓淡燃烧器改造及数值模拟研究

Retrofit and Numerical Simulation study on Horizontal Bias Burner of Coal-fired Utility Boiler

针对某电厂四角切圆燃烧锅炉由于燃用煤种多变、煤质下降,炉内出现着火困难,燃烧不稳定以及水冷壁易结渣等问题,采用水平浓淡燃烧技术对其一次风进行改造。通过数值模拟可以看出,利用偏流挡块和分隔板控制煤粉流向,浓侧出口的煤粉质量与淡侧出口的煤粉质量之比约为1.5,实现炉内水平浓淡燃烧,炉内燃烧器布置区域温度水平有所升高,煤粉着火容易且燃烧状态稳定,同时降低了水冷壁结渣的可能性。通过与锅炉现场试验结果进行对比结果吻合。

For problems like occurring furnace fire difficulties, unstable combustion and the water cooled wall slagging due to burning different kinds of coal kinds and the declining of medium in the tangentially fried boiler in some power plants, adapting the horizontal bias combustion technology to reform its primary air. It can be seen from the numerical simulation that applying the bias block and partition board to control the pulverized coal flow, the ratio of the pulverized coal quality from rich side to the light side is 1.5, which can achieve the furnace horizontal bias combustion, the horizontal exaltation of the temperature of the layout area of the furnace burner, the pulverized coal easy to be on fire and the steady state of burning, and which can also reduce the possibility of the water cooled wall slagging. By the comparison this is in well agreement with the boiler field test results.