文献类型：期刊文献

英文题名：Flow mechanisms and solid flow rate prediction of powders discharged from hoppers with an insert

作者：Sun, Dong[1];Lu, Haifeng[1];Cao, Jiakun[1];Wu, Yuting[1];Guo, Xiaolei[1];Gong, Xin[1]

机构：[1]East China Univ Sci & Technol, Shanghai Engn Res Ctr Coal Gasificat, Shanghai 200237, Peoples R China

年份：2020

卷号：367

起止页码：277

外文期刊名：POWDER TECHNOLOGY

收录：;EI(收录号：20201508387180);WOS:【SCI-EXPANDED(收录号:WOS:000532835500028)】；

基金：This work was supported by the National Natural Science Foundation of China (51876066), the National Key R&D Program of China (2018YFC0808500), the Shanghai Engineering Research Center of Coal Gasification (18DZ2283900) and the Fundamental Research Funds for the Central Universities.

语种：英文

外文关键词：Insert; Hopper discharge; Flow behavior; Solid flow rate; Powder flow

摘要：In this paper, lignite and glass beads with different particle size were selected as experimental materials. These powder materials were discharged from hoppers in the situations of without insert (No-In), with confined insert (Con-In) and with unconfined insert (Ucon-In), respectively. The discharge processes were first discussed in detail and consequently, the solid flow rate of powders was obtained and analyzed. The flow zones in hoppers were divided based on the radial flow model of powder flow and the effects of inserts on the flow zone evolution were revealed. Experimental results show that both confined and unconfined inserts are beneficial to the increase of the solid flow rate, especially for the weaker flowability powders. The lignite, with the worst flowability, shows the largest increment of solid flow rate giving a value of 58% under Con-In. Considering characteristics of the inserted hopper structure as well as the development of flow zones, a modified model derived from the minimum energy theory was developed. The model was able to predict the solid flow rate through both the traditional hoppers and the inserted hoppers, with the deviation below than 10%. (C) 2020 Elsevier B.V. All rights reserved.