文献类型：期刊文献

英文题名：Flow behavior and clogging characteristics of slag particles in multi-stage pressure reducing pipes

作者：Yang, Guangrun[1];Zhao, Hui[1];Xu, Jianliang[1];Dai, Zhenghua[1,2];Liu, Haifeng[1,3]

机构：[1]East China Univ Sci & Technol, Engn Res Ctr Resource Utilizat Carbon containing W, Minist Educ, Shanghai 200237, Peoples R China;[2]Xinjiang Univ, State Key Lab Chem & Utilizat Carbon Based Energy, Urumqi 830046, Peoples R China;[3]Liaoning Petrochem Univ, Fushun 113001, Liaoning, Peoples R China

年份：2027

卷号：485

外文期刊名：POWDER TECHNOLOGY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:001846498700001)】；

基金：This research was supported by the Key Research and Development Program of Autonomous Region (2023B01013) .

语种：英文

外文关键词：Particles clogging; Multi-stage reducing pipes; Liquid-solid flow

摘要：Clogging is a prevalent issue in fields such as shale oil and gas development, colloidal contaminant control, and chemical processing engineering. Particularly in the coal chemical industry, clogging induced by complex multiphase flow not only impairs production efficiency but can also result in catastrophic equipment damage. In this study, high-speed imaging technology was employed to investigate the clogging behavior and mechanisms of gasification slag particles within multi-stage orifice pipes, focusing on the influence of particle size and injection rate. The particle flow behavior and wall impact characteristics were analyzed. Experimental results demonstrate that clogging within multi-stage orifice pipes is governed by the ratio of the orifice width to the minimum particle dimension (W/dmin) and the particle concentration. A clogging mechanism map was established based on W/dmin and the particle aspect ratio (AR). Stable two-particle and, to a lesser extent, three-particle bridging structures were observed, with two-particle bridging being the predominant form. Further analysis indicates that particles prone to bridging-induced clogging typically cluster within the ranges of W/dmin = 1.43-2.22 and AR = 1.25-1.70, where particles form stable bridging structures via interlocking. Single-particle jamming occurs within the ranges of W/dmin = 1.05-1.54 and AR = 1.25-1.45, typically resulting from excessive particle size or unfavorable orientation at the orifice. Clogging predominantly occurs near the orifice edges. The probability of clogging increases with particle concentration and injection rate, and is most frequently observed at the firststage orifice. These findings provide a theoretical basis for the design and optimization of multi-stage orifice pipes.