Comparison of Axial Flow and Swirling Flow on Particle Pickup in Horizontal Pneumatic Conveying

Yun Ji (), Yating Hao, Ning Yi, Tianyuan Guan, Dianrong Gao and Yingna Liang
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Yun Ji: School of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, China
Yating Hao: School of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, China
Ning Yi: School of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, China
Tianyuan Guan: School of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, China
Dianrong Gao: School of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, China
Yingna Liang: School of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, China

Energies, 2022, vol. 15, issue 17, 1-18

Abstract: Pneumatic conveying is widely used in coal mining. As the lowest conveying velocity of materials, the pickup velocity is the key to the study of gas–solid two-phase flow. In this study, the pickup velocity of pebble particles was experimentally investigated. When the particle size is 3–9 mm, the airflow velocity was found to suitably describe the results as a function of the pickup velocity and have a high correlation. When the swirl number is 0.2, the optimal swirl number was found for which the highest particle pickup ratio was observed. Based on four different methods, namely, visual observation, mass weighing, coefficient of difference analysis, and determination of the peak-average ratio of the pressure drop in the flow field to measure the pickup velocity of the spraying material, the results showed that the accuracy of the particle pickup velocity obtained through visual observation was the lowest, and when the mass–loss rate of the particle was selected as the measurement index of the pickup velocity, the accuracy was the highest. The results will help to realize the long-distance transportation of spraying materials in inclined roadway under the shaft.

Keywords: axial flow; swirling flow; pickup behavior; coefficient of variation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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