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/cm3.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/cm3, when the large size coal (50-150 mm) was beneficiated in the DADMFB under the most uniform state.
李国丰, 段晨龙, 陆俊宇, 赵跃民, 周恩会. 深型空气重介流化床密度均匀性研究[J]. 石油学报（石油加工）, 2018, 34(5): 987-994.
LI Guofeng, DUAN Chenlong, LU Junyu, ZHAO Yuemin, ZHOU Enhui. Study on Density Uniformity in a Deep Air Dense Medium Fluidized Bed. ACTA PETROLEI SINICA (PETROLEUM PROCESSING SECTION, 2018, 34(5): 987-994.