深型空气重介流化床密度均匀性研究  

Study on Density Uniformity in a Deep Air Dense Medium Fluidized Bed

作　　者：李国丰 段晨龙[1] 陆俊宇 赵跃民[1] 周恩会[1] LI Guofeng;DUAN Chenlong;LU Junyu;ZHAO Yuemin;ZHOU Enhui(School of Chemical Engineering&Technology,China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]中国矿业大学化工学院,江苏徐州221116

出　　处：《石油学报（石油加工）》2018年第5期987-994,共8页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：国家自然科学基金重大研究计划培育项目(91434133)和国家自然科学基金项目(51304196)资助

摘　　要：采用床层空间各处局部压降波动表征深床层密度在径向分布的非均匀性结构,并通过布风结构的设计探索了由布风室结构改变优化深床密度分布的可行性。在床体直径为600mm,初始床高为520~760mm流化床中进行实验。研究表明,预布风室结构的改变可以有效改善床层密度径向分布均匀性,在新型布风室作用下床层径向高密度区域由集中于床层中轴部变为分散于床层四周,且床层密度均匀分布的区域范围也明显增加。床层密度径向分布随着流化气速的增加高密度区域先减小再增加,当流化数为1.6时,密度分布标准差为最小值0.1035g/cm3;随着初始床高的增加,床层径向密度分布规律越来越不明显,且波动越来越剧烈;此外,处于最均匀状态下的深床层分选50~150mm大块煤时,可能性偏差达到0.042g/cm3。The feasibility of optimizing the density distribution of the deep air dense medium fluidized bed(DADMFB)was explored by changing the air chamber structural design.The local pressure drop fluctuation throughout bed space is used to characterize the non-uniformity of bed density in radial direction.Experimental tests were performed in a deep bed with the diameter of 600 mm and the height of 520-760 mm.Test results indicate that the non-uniformity of bed density in radial distribution can be effectively improved by changing the structure of air chamber when a new type air chamber is used.With applying the new air chamber,the high density region shifts from central axis of the bed to its periphery,and the density uniform area also can obviously increase.With fluidizing gas velocity increase,the radial distribution of bed density decreases in the beginning and then increases,and the minimum standard deviation is 0.1035 g/cm 3.With the increase of initial bed height,the regularities of radial density distribution become less obvious,and the density fluctuations become more intense.In addition,the Ecart probable Moyen value can be reduced to 0.042 g/cm 3,when the large size coal(50-150 mm)was beneficiated in the DADMFB under the most uniform state.

关 键 词：空气重介流化床 深床 密度分布 布风室结构 

分 类 号：TD94[矿业工程—选矿]