文献类型：期刊文献

英文题名：Pressure drop prediction in the compressible powder bed of pulverized coal during gas pressurization

作者：Wang, Shicheng[1];Guo, Xiaolei[1];Qin, Guang[1];Yang, Yunfei[1];Lu, Haifeng[1];Liu, Haifeng[1]

机构：[1]East China Univ Sci & Technol, Natl Energy Res Ctr Coal Gasificat Technol, Carbon containing Waste Recycling Engn Ctr, POB 272, Shanghai 200237, Peoples R China

年份：2025

卷号：301

外文期刊名：CHEMICAL ENGINEERING SCIENCE

收录：;EI(收录号：20243817039061);WOS:【SCI-EXPANDED(收录号:WOS:001317358800001)】；

基金：The authors acknowledge financial supports from the Shanghai En-gineering Research Center of Coal Gasification (18DZ2283900) .

语种：英文

外文关键词：Powder compression; Gas permeation; Pressure drop; Gas pressurization; Relative packing density

摘要：The reliable discharge of pulverized coal from the high-pressure lock hopper is crucial for the dry feeding process in entrained-flow gasification. However, challenges persist due to the unclear gas-solid interaction and the difficulty in predicting the relative packing density (RPD). A comparative analysis of RPD characteristics of pulverized coal at various pressurization rates was conducted using ideal spherical glass bubbles. The results showed that the RPD of the powder bed was mainly affected by the void fraction at a smaller pressurization rate; as the pressurization rate increased, the pressure drop formed by gas permeation dominated the RPD at a steady state. A mathematical model, based on the microelement method of force analysis, was developed in order to relate the RPD to the normal stress measured with standard powder compressibility testers. The generally agreement of the new model was found to be in the range of +/- 15 %.