径向分层对随机堆积固定床内气体流动特性的影响研究

张亚新; 海东

doi:10.13568/j.cnki.651094.651316.2021.09.28.0002

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径向分层对随机堆积固定床内气体流动特性的影响研究

化学与化工 | 更新时间：2026-01-21

- 径向分层对随机堆积固定床内气体流动特性的影响研究
- 径向分层对随机堆积固定床内气体流动特性的影响研究
- 新疆大学学报（自然科学版中英文） 2022年39卷第5期页码：567-572
- 作者机构：
  
  1. 新疆大学化工学院
  2. 新疆大学省部共建碳基能源资源化学与利用国家重点实验室
- 作者简介：
- 基金信息：
  
  国家自然科学基金（21766034）
- DOI：10.13568/j.cnki.651094.651316.2021.09.28.0002
  中图分类号： TQ021.1
- 纸质出版：2022
- 稿件说明：
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[1]张亚新,海东.径向分层对随机堆积固定床内气体流动特性的影响研究[J].新疆大学学报(自然科学版)(中英文),2022,39(05):567-572.
[1]张亚新,海东.径向分层对随机堆积固定床内气体流动特性的影响研究[J].新疆大学学报(自然科学版)(中英文),2022,39(05):567-572. DOI： 10.13568/j.cnki.651094.651316.2021.09.28.0002.

DOI：10.13568/j.cnki.651094.651316.2021.09.28.0002.

摘要

为了更好地探究径向分层对随机堆积固定床内气体流动特性的影响，采用离散元计算流体力学耦合方法（DEMCFD）对径向双层随机堆积床内的流场进行数值模拟，分别建立常规床层、径向25%分层、径向50%分层及径向75%分层床层模型，分析床层径向空隙率、压降和速度场的变化．模拟结果表明：在床层中施加径向分层装置，使得两侧床层内颗粒堆积空间再分配，颗粒堆积总数减少，床层整体空隙率增大，床层流动阻力降低，压降减小，径向空隙率在径向分层处回归峰值，极大改善床层内部流动；其中径向50%分层床内颗粒堆积数分别较常规床层及25%、75%分层床层减少了5.4%、3.5%、1.5%，床层整体空隙率分别增大了5.2%、3.3%、2.4%，床层压降分别降低了14.1%、10%、7.75%，在筒体壁面处的床层速度分别减少了5.4%、3.5%、1.5%.

Abstract

In order to better explore the influence of radial stratification on the gas flow characteristics in random stacked fixed-bed

the discrete element-computational fluid dynamics coupling method(DEM-CFD) was used to numerically calculate the flow field in the radial double-layer random stacked bed. The regular bed

radial 25%stratified bed

radial 50% stratified bed and radial 75% stratified bed model were established respectively. The radial porosity

pressure drop and velocity field of the bed were analyzed. The simulation results show that the radial layering device is applied to the bed to redistribute the particle accumulation space on both sides of the bed

the total number of particle accumulation is reduced

the void ratio of the bed is increased

the flow resistance of the bed is reduced

and the pressure drop is reduced. The radial porosity returns to the peak at the radial stratification

which greatly improves the internal flow of the bed; The number of particles in the radial 50% layered bed is reduced by 5.4%

3.5% and 1.5% respectively compared with the conventional bed

25% and 75% layered bed

the void ratio of the bed increased by 5.2%

3.3% and 2.4% respectively

the bed pressure drop decreased by 14.1%

10% and7.75% respectively

and the bed velocity at the wall of the cylinde is reduced by 5.4%

3.5% and 1.5% respectively.

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Keywords

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