New insights into coarse particle lifting performance of a hydraulic ejector with an ultra-large area ratio

•The interphase forces between the fluid and particles were studied.•The particle lifting mechanisms of the HE-ULAR was revealed.•The optimal operation condition of the HE-ULAR was detected.•A series of formulas for the fluidized coal mining parameters were established. Hydraulic ejectors with ultra...

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Veröffentlicht in:Fuel (Guildford) 2024-12, Vol.377, p.132737, Article 132737
Hauptverfasser: Wen, Xiaojiang, Liu, Yingke, Kang, Jianhang, Yin, Lingxiao, Zheng, Lingna, Yuan, Man, GuoqingYe, Tabor, Gavin, Wen, Chuang
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Sprache:eng
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Zusammenfassung:•The interphase forces between the fluid and particles were studied.•The particle lifting mechanisms of the HE-ULAR was revealed.•The optimal operation condition of the HE-ULAR was detected.•A series of formulas for the fluidized coal mining parameters were established. Hydraulic ejectors with ultra-large area ratios (HE-ULAR) have potential applications as particle lifting equipment in fluidized coal mining. This study analyzed the effects of area and pressure ratios on the coarse particle lifting performance of HE-ULAR. The cavitation, valid, and failure zones for coarse particle lifting were mapped out. The results show that the pressure gradient force acting on each particle is approximately 2.02–3.70 times greater than the drag force, indicating that the pressure gradient force is the more significant interaction force for particle migration under the influence of HE-ULAR compared to the drag force. Additionally, insufficient energy transfer between the energetic fluid and particles in the valid zone of HE-ULAR reduces the fluid energy density and particle lifting concentration at low pressure ratio conditions. The HE-ULAR exhibits optimal particle performance at the operating conditions with an area ratio of 12.51 and a pressure ratio of 0.0735. Finally, a series of prediction formulas for fluidized coal mining parameters were established based on the optimal operating condition of the HE-ULAR. These results will guide the application of the HE-ULAR in a fluidized mining system.
ISSN:0016-2361
DOI:10.1016/j.fuel.2024.132737