文献类型：期刊文献

英文题名：Multiscale analysis of flow patterns in the dense-phase pneumatic conveying of pulverized coal

作者：Jin, Yong[1];Lu, Haifeng[1];Guo, Xiaolei[1];Gong, Xin[1]

机构：[1]East China Univ Sci & Technol, Shanghai Engn Res Ctr Coal Gasificat, Minist Educ, Key Lab Coal Gasificat & Energy Chem Engn, Shanghai 200237, Peoples R China

年份：2019

卷号：65

期号：9

外文期刊名：AICHE JOURNAL

收录：;EI(收录号：20192607094108);WOS:【SCI-EXPANDED(收录号:WOS:000478103500017)】；

语种：英文

外文关键词：electrical capacitance tomography; energy matrix; multi scale; rescaled range analysis; wavelet transform

摘要：Four typical flow patterns in the vertical pipe of the dense-phase pneumatic conveying of pulverized coal were obtained, namely packed bed flow, plug flow, churn flow and less dense phase flow. The electrical capacitance tomography (ECT) was used for space-time multiscale analysis. Firstly, Daubechies second order wavelet transform and rescaled range analysis(R/S) were applied for the scientific multiscale decompositions. The multiscale frequency range is that the microscale signal is d(1)-d(5) (2.1875, 70.0000) Hz, the mesoscale signal is d(6) and d(7) (0.5469, 2.1875) Hz and the macroscale signal is d(8)-d(11) (0.0342, 0.5469) Hz. The multiscale ECT signal characteristics of pure gas flow, particle-wall friction, and particle-particle collision were determined by experiments. The multiscale ECT signal energy matrix is proposed, based on the multiscale energy structure characteristics. Control mechanisms and multiscale statistical rules of four typical flow patterns are obtained. This study provides theoretical support for the study of flow pattern transformation of dense-phase pneumatic conveying.