600 MW褐煤机组掺烧烟煤对MB型风扇磨性能的影响

为掌握褐煤掺烧烟煤后对MB型风扇磨煤机提升压头、研磨出力、干燥出力及运行参数选取的影响,在SO2风扇磨煤机上进行了褐煤掺烧烟煤的半工业性试磨试验以及MB3600/1000/4900三介质风扇磨的热平衡计算,同时在一维火焰燃烧试验炉和煤粉气流着火温度试验炉上进行了相应的燃烧性能测试。结果表明,劣质褐煤掺烧合适比例的优质烟煤,可提高机组的带负荷能力,且磨煤机的提升压头和干燥能力也能满足运行要求。需要注意的是,由于烟煤的磨损性能较褐煤强,可能导致打击板寿命的降低。

Effect of bituminous coal blending on MB fan mill for 600 MW lignite unit

In order to comprehensively analyze the influence of lignite boiler with blending bituminous coal on the promotion pressure,grinding force,drying output and operation parameters of the MB fan mill,the semi-industrial test on a SO2 fan mill and the thermal equilibrium computation for three medium fan mill MB3600/1000/4900 were carried out,and the combustion characteristic of mixed coal was tested on one-dimensional flame furnace and coal-air flow ignition temperature test furnace.The results show that through blending low calorific value lignite with a suitable proportion of high-quality bituminous coal,the load carrying capacity can be improved,and the drying capacity and promotion pressure also can fulfill the operation requirement.It is important to note that blending of bituminous coal will reduce the life of striking plate due to the stronger wear resistance of bituminous coal.