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燃煤已造成了我国严重的大气污染及酸雨 .选煤是煤燃前净化的主要技术 ,对治理煤烟污染发挥着重要作用 .传统的选煤方法是水洗 ,而严重干旱缺水的现实又制约着西北地区洗煤技术的应用与发展 .空气重介质流化床是不用水的干法分选新技术 ,对我国西部煤炭资源的开发利用具有极广阔的应用前景 .因此 ,开展对空气重介质流化床的多相流体动力学研究具有十分重要的理论意义和作用 .本文通过单颗粒动力学模型及数值计算得到不同的密度与粒度的矿粒在空气重介质流化床下沉的深度描述 ,同样粒度下矸石密度大于精煤密度而形成矸石在上精煤在下的分离层 ,从动力学角度解释了其分选的基本原理
Coal has caused serious air pollution and acid rain in our country.Coalisation is the main technology of coal combustion before purification and plays an important role in the control of soot pollution.The traditional coal preparation method is water washing and the seriousness of drought and water shortage Restricting the application and development of coal washing technology in the northwestern China.Air heavy medium fluidized bed is a new dry separation technology without water and has a very broad application prospect for the development and utilization of coal resources in western China.Therefore, Fluidized bed multiphase fluid dynamics study has very important theoretical significance and role.In this paper, single particle kinetic model and numerical calculation of different density and particle size of the mineral particles in the air heavy medium fluidized bed sinking depth description , The same granularity of the gangue density greater than the density of the coal to form the gangue in the separation layer on the clean coal from the kinetic point of view to explain the basic principles of its sorting