WANG Wei1 ， GUAN Qingliang2 ， ZHANG Jiansheng2
（1. North China Power Engineering Co.， Ltd. of China Power Engineering Consulting Group， Beijing 100120， China； 2. a. Department of Thermal Engineering； b. Key Laboratory for Thermal Science and Power Engineering of Ministry of Education， Tsinghua University， Beijing 100084， China）
Abstract： An experimental study on the pneumatic conveying of pulverized coal powders at elevated pressures was carried out. The influences of superficial gas velocity, mass flow rate and conveying back pressure on the flow patterns were investigated with electrical capacitance tomography. The results indicate that four flow patterns, i. e., suspension flow, stratified flow, dune flow and moving bed flow appear as the superficial gas velocity decreases. The flow pattern tends to moving bed flow as the mass flow rate increases, as well as the increases in frequency and the length of moving bed. The suspension flow appears with the increase in conveying back pressure and the decrease in mass flow rate. The moving bed flow is more likely to form with the lower superficial gas velocity when the conveying back pressure is high.
Keywords: pneumatic conveying; pulverized coal powders; flow pattern
中图分类号：TQ 536 文献标志码：A
文章编号：1008-5548（2014）06-0021-04
DOI:10.13732/j.issn.1008-5548.2014.06.005
收稿日期：2014-04-04， 修回日期：2014-04-16，在线出版时间：2014-12-22。
第一作者简介：王巍（1983—），男，博士研究生，工程师，研究方向为洁净煤技术。 E-mail:wangw@ncpe.com.cn。
