文献类型：期刊文献

英文题名：Hopper discharge of cohesive powders using pulsated airflow

作者：Zhu, Lizhuo[1];Lu, Haifeng[1];Poletto, Massimo[2];Liu, Haifeng[1];Deng, Zhiwen[1]

机构：[1]East China Univ Sci & Technol, Shanghai Engn Res Ctr Coal Gasificat, POB 272, Shanghai 200237, Peoples R China;[2]Univ Salerno, Dipartimento Ingn Ind, Salerno, Italy

年份：2020

卷号：66

期号：7

外文期刊名：AICHE JOURNAL

收录：;EI(收录号：20201908618620);WOS:【SCI-EXPANDED(收录号:WOS:000529655100001)】；

基金：This work was supported by the National Natural Science Foundation of China (51876066, 21878095) and the National Key R&D Program of China (2018YFC0808500).

语种：英文

外文关键词：aggregate; cohesive powder; fluidization; hopper discharge; square-wave pulsated airflow

摘要：An aerated hopper with pulsated aeration was designed to study the effect of square-wave pulsated airflow on the discharge characteristics of cohesive and non-cohesive powders. Experiments were carried out with pulsation frequencies between 0 (continuous) and 50 Hz. Two flow patterns were observed at different aeration rates and pulsation frequencies: intermittent and smooth. For non-cohesive powders, pulsated aeration has a worsening effect on discharge flow. For cohesive powders, results revealed that pulsated aeration can reduce the minimum aeration necessary to allow continuous discharge. And the maximum discharge rate that can be attained applying pulsated aeration is higher than that of continuous aeration and it is significantly more uniform. The aggregates size of the powder was estimated and used to understand the stabilizing mechanism of pulsated aeration on the aggregative discharge. The model value of the minimum aeration rate and the discharge rate were obtained and compared with the experimental values.