Measurement of the fluidized velocity in gas-solid fluidized beds based on AE signal analysis by wavelet packet transform

查看全文 作　　者：WANG [1]JingDai;YANG [1]YongRong;GE [1]PengFei;SHU [1]WeiJie;HOU [2]LinXi

机构地区：[1]Department of Chemical and Biochemical Engineering,State Key Laboratory of Chemical Engineering,Polymer Reaction Engi-neering Division,Zhejiang University,Hangzhou 310027,China;[2]College of Chemical Engineering and Materials Science,Ningbo University,Ningbo 315211,China

出　　处：《Science China Chemistry》索引2007年第50卷第2期,共6页

基　　金：Supported by the National Natural Science Foundation of China (Grant No. 204090205) 摘　　要：An energy distribution theory was presented based on regular evolvement of energy fraction of acous-tic signals with fluidization velocity. Wavelet packet analysis was used in processing the acoustic sig-nals originated from particle impact on the wall of a fluidized bed. A new criterion of judging incipient fluidization(Umf) velocity and minimum turbulent velocity(Umt) was proposed according to the energy distribution theory. Experiments were performed with five groups of high density polyethylene(PE) particles and one bimodal PE to acquire incipient fluidization velocity and minimum turbulent velocity by using the criterion. The feasibility of this method in obtaining characteristic fluidization parameters was further verified by comparing it to results from the pressure drop method and the empirical value from industry. 关键词：fluidized BED minimum FLUIDIZATION VELOCITY minimum TURBULENT VELOCITY acoustic emission WAVELET PACKET transform

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Measurement of the fluidized velocity in gas-solid fluidized beds based on AE signal analysis by wavelet packet transform

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