Fluidization Characteristics of Medium Solids with a Wide Size Range
TANG Li-gang
ZHAO Yue-min
LUO Zhen-fu
CHEN Zeng-qiang
LIANG Chun-cheng
XING Hong-bo
Abstract：To expand the suitable size range of medium solids used in gas-solids fluidized beds for dry separation of coal, a type B-A magnetite powder and type B-A fine coal with a specific size distribution were mixed at a specific ratio of weight. The fluidization characteristics and separation performances of the mixture with a wide size range were studied. The results show that in the presence of particles with smaller size or lower density in group A powders,the bed density decreases gradually with the increasing of bed height with a high density standard devi-ation value of 0. 060 1 g/cm~3. Both magnetite powder with 0.3-0. 074 mm size and fine coal with 1-0.15 mm size distribute uniformly in a commercial gas-solids fluidized bed with uni-form and stable density, and the fluidization performances of recycled medium solids with a wide size range of 1-0. 074 mm are very good under suitable technical and operating parame-ters. The commercial fluidized bed using medium solids with a wide size range of 1-0. 074 mm can efficiently separate coal of 50-6 mm size with a low probable error E value of 0.06 g/cm~3 at a separating density of 1.61 g/cm~3.
Keywords：medium solids with a wide size rangegas-solids fluidized bedfluidization charac-teristicseparation
Publication Date：2009-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 509-514 )