Dry Cleaning of Fine Coal Based on Gas‐Solid Two‐Phase Flow: A Review
Dry Cleaning of Fine Coal Based on Gas‐Solid Two‐Phase Flow: A Review
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DOI：
10.1002/ceat.201600265
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发表时间：
2017-03
影响因子：
2.1
通讯作者：
Xuliang Yang;Yuemin Zhao;Z. Luo
中科院分区：
文献类型：
--
作者：
Xuliang Yang;Yuemin Zhao;Z. Luo
Recently, dry cleaning of coal becomes increasingly significant for the purpose of improving energy efficiency and reducing air pollutant emissions, especially in drought coal-producing regions. With the extensive applications of fully mechanized coal mining technology, the yield of fine coal (-6 mm) in run-of-mine coal increases obviously. Thus, it is urgent to study and develop fine coal dry cleaning processes. Most of the recent studies focus on fine coal dry cleaning processes based on gas-solid two phase flow and these processes are mainly classified into the following three categories. Modified air dense medium fluidized bed cleaning has high cleaning accuracy but confronts the problems of product purification and medium recovery. Density-segregation gas-fluidized bed cleaning doesn't use artificial medium solids and has a simple process and a stable performance. However, its cleaning accuracy is relatively low and needs to be improved by accurately controlling feed properties and operational parameters. Air table cleaning also uses no artificial medium and beneficiates fine coal depending on the differences in density and coefficient of friction. Its cleaning accuracy is approximate to that of density-segregation gas-fluidized bed cleaning but has more influential factors.
