Characteristics of pressure fluctuations and fine coal preparation in gas-vibro fluidized bed  

作　　者：Liang Dong Yuemin Zhao Liping Peng Jie Zhao Zhenfu Luo Qingxia Liu Chenlong Duan 

机构地区：[1]School of Chemical Engineering and Technology,China University of Mining and Technology [2]School of Mechatronic Engineering,China University of Mining and Technology [3]Department of Chemical and Materials Engineering,University of Alberta

出　　处：《Particuology》2015年第4期146-153,共8页颗粒学报（英文版）

基　　金：supported financially by the National Key Basic Research Program of China(973 Program,No.2012CB214904);the National Natural Science Foundation of China(Nos.51221462,51134022,51304196,and 91434133);the Specialized Research Fund for the Doctoral Program of Higher Education(No.20120095130001);a Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions

摘　　要：To improve the separation efficiency of air dense medium fluidized beds tor dry coal preparation, a gasvibro fluidized bed has been proposed in which magnetic powder is used as the heavy medium. Pressure fluctuations in the gas-vibro fluidized bed were investigated using time- and frequency-domain analysis methods. The relationship between pressure fluctuations, bubble behavior, and separation efficiency was established. The low amplitude of the standard deviation, the power spectral density （PSD）, the incoherent-output PSD, and the high amplitude of the coherent-output PSD, which corresponds to the bubble behavior in the bed, were improved for coal preparation. The coal ash content was reduced from 42.5570 to 16.54% by using the gas-vibro fluidized bed.To improve the separation efficiency of air dense medium fluidized beds tor dry coal preparation, a gasvibro fluidized bed has been proposed in which magnetic powder is used as the heavy medium. Pressure fluctuations in the gas-vibro fluidized bed were investigated using time- and frequency-domain analysis methods. The relationship between pressure fluctuations, bubble behavior, and separation efficiency was established. The low amplitude of the standard deviation, the power spectral density （PSD）, the incoherent-output PSD, and the high amplitude of the coherent-output PSD, which corresponds to the bubble behavior in the bed, were improved for coal preparation. The coal ash content was reduced from 42.5570 to 16.54% by using the gas-vibro fluidized bed.

关 键 词：Pressure fluctuation Gas-vibro fluidized bed Power spectral COHERENCE Coal preparation 

分 类 号：TQ536[化学工程—煤化学工程] TQ051.13