Effect of Intake position on powder fluidization and conveying characteristics in powder supply device

作者：Ren, Guanlong; Sun, Haijun^*; Xu, Yihua; Li, Chao; Shen, Wen; Cai, Yunzhen

来源：Chemical Engineering and Processing, 2023, 183: 109240.

DOI：10.1016/j.cep.2022.109240

• Powder engine
• Dense gas-solid two-phase flow
• Built-in intake structure
• Two-fluid model
• Numerical simulation

In this work, a novel built-in intake channel powder supply device was developed for the piston-driven powder fuel feeding system, and a multi-physical coupling model of the gas-powder-moving wall was established using the User Defined Function. A numerical study of powder fluidization and conveying characteristics in a novel powder supply device was presented by using a two-fluid model, and the effects of different intake positions on the flow characteristics in terms of dense gas-solid two-phase in the powder supply process were studied. The results show that the gas phase region is mainly distributed around the intake channel. The powder outlet flow rate fluctuation and the powder layer (epsilon p=0.1) area peak decreased by 36.6% and 62.5%, respectively, when the intake position is moved forward from 153.9 mm to 172.2 mm in the axial. The area-averaged gas velocity increases and the area-averaged powder volume fraction decreases at the two-phase throat with the forward movement of the intake position. There is a stable stage of the pressure change in the powder storage tank and in the delivery pipeline when the intake channel is arranged at 153.9 mm in the axial, which is more beneficial to the stable conveying of powder.

• 单位
  西北工业大学; 南昌航空大学