文献类型：期刊文献

英文题名：Flow Pattern Characteristics in Vertical Dense-Phase Pneumatic Conveying of Pulverized Coal Using Electrical Capacitance Tomography

作者：Cong, Xingliang[1];Guo, Xiaolei[1];Lu, Haifeng[1];Gong, Xin[1];Liu, Kai[1];Xie, Kai[1];Sun, Xiaolin[1]

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

年份：2012

卷号：51

期号：46

起止页码：15268

外文期刊名：INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH

收录：;EI(收录号：20124815715340);WOS:【SCI-EXPANDED(收录号:WOS:000311325200036)】；

基金：The authors acknowledge financial support from the National key Program of Basic Research in China (2010CB227002-3) and "Chen Guang" project supported by Shanghai Municipal Education Commission and Shanghai Education Development Foundation.

语种：英文

外文关键词：Pneumatic conveyors - Probability density function - Two phase flow - Pneumatics - Pulverized fuel - Capacitance - Coal - Electric impedance tomography - Power spectral density

摘要：Research on flow patterns can provide a better understanding Of particle dynamics in dense phase pneumatic conveying of pulverized coal. In this paper, electrical capacitance tomography (ECT) has been employed to study flow patterns in, the 20 mm diameter vertical riser. Three flow patterns were identified.. on the basis of ECT image analysis, and their characteristics and formation mechanisms were discussed. The flow patterns at high solid concentration were more asymmetrical than those at low solid concentration. Solid concentration signals obtained from ECT were analyzed by different signal analysis methods including relative standard deviation (RSD), probability density function (PDF), and power spectral density function (PSD), Which were verified to be effective enough to identify the characteristics of the different how patterns. Additionally, the Bi model (Bi, H. T.; Grace, J. R. Int J. Multiphase Flow 1995, 21, 1229-1239) was modified to effectively predict chocking velocity in the vertical dense-phase pneumatic conveying of pulverized coal.