CFD simulation of circulation flow caused by jet in DTB crystallizer

LI Jixiang; HAO Tingting; LAN Zhong; MA Xuehu

doi:10.11949/j.issn.0438-1157.20151049

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CFD simulation of circulation flow caused by jet in DTB crystallizer

更新时间：2025-12-10

- CFD simulation of circulation flow caused by jet in DTB crystallizer
- CIESC Journal Issue 9, Pages: 3383-3390(2015)
- 作者机构：
  
  大连理工大学化学工程研究所, 辽宁省化工资源清洁利用重点实验室,辽宁,大连,116024
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20151049
  CLC： Q021.1
- Online First：05 September 2015，
  
  Published：05 September 2015
- 稿件说明：
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LI Jixiang, HAO Tingting, LAN Zhong, et al. CFD simulation of circulation flow caused by jet in DTB crystallizer[J]. CIESC Journal, 2015, (9): 3383-3390.
DOI：

LI Jixiang, HAO Tingting, LAN Zhong, et al. CFD simulation of circulation flow caused by jet in DTB crystallizer[J]. CIESC Journal, 2015, (9): 3383-3390. DOI： 10.11949/j.issn.0438-1157.20151049.

摘要

采用RNG k-ε湍流模型对实验室级射流循环DTB蒸发结晶器内的单相流流场进行了数值模拟并优化结晶器结构

用欧拉多相流模型对优化的结晶器进行多相流模拟分析。结果表明

导流筒内射流满足线性扩展

其轴向速度分布基本满足高斯分布。刚进入导流筒内的射流段

轴线速度倒数与流程呈良好的线性关系

随射流的发展

轴线速度加速衰减。在入口直径恒定时

循环速率比随导流筒挡板间环隙面积与导流筒横截面积比的增加呈先增大再减小的趋势

存在最优值。优化的实验级DTB结晶器中导流筒内颗粒浓度分布沿径向方向减小

但基本可实现颗粒浓度较为均匀的分布

其循环速率与单相流模拟结果相比较低。

Abstract

The circulation jet flow field in a DTB evaporating crystallizer was simulated and analyzed using RNG k-ε turbulent model. Based on the Eulerian multiphase flow model

the structure of the crystallizer and the flow field in the crystallizer were simulated and optimized. The simulation results showed that the jet could satisfy linear expansion in the draft tube and the axial velocity distribution basically met the Gaussian distribution. For the jet flow at entrance region of the draft tube

the reciprocal of axis velocity and flow distance showed a good linearity. However

axial velocity decayed faster with the development of the jet flow. The area ratio (β) of the annulus between draft tube and the baffle to the cross-section of the draft tube significantly influenced the circulation flow ratio (γ). With the increase of β

γ increased at first

and then decreased

accordingly an optimal γ exists. Although the particle concentration of the crystal slurry decreased along the radial direction in the draft tube

it still had a more even distribution within the optimized structure crystallizer.

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