CFD simulation of chemical conditioning unit of municipal sludge

XU Qi; DENG Chao; SHI Yafei; XU Xinyu; YU Wenbo; LI Chao; CHEN Ye; LIANG Sha; HU Jingping; HE Shu; WANG Rong; YANG Changzhu; YANG Jiakuan

doi:10.11949/j.issn.0438-1157.20150319

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CFD simulation of chemical conditioning unit of municipal sludge

更新时间：2025-12-10

- CFD simulation of chemical conditioning unit of municipal sludge
- CIESC Journal Issue 10, Pages: 4145-4154(2015)
- 作者机构：
  
  1. 华中科技大学环境科学与工程学院,湖北,武汉,430074
  2. 宇星科技发展有限公司,广东,深圳,518057
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20150319
  CLC： 705
- Online First：05 October 2015，
  
  Published：05 October 2015
- 稿件说明：
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XU Qi, DENG Chao, SHI Yafei, et al. CFD simulation of chemical conditioning unit of municipal sludge[J]. CIESC Journal, 2015, (10): 4145-4154.
DOI：

XU Qi, DENG Chao, SHI Yafei, et al. CFD simulation of chemical conditioning unit of municipal sludge[J]. CIESC Journal, 2015, (10): 4145-4154. DOI： 10.11949/j.issn.0438-1157.20150319.

摘要

市政污泥机械脱水前多采用化学调理

调理装置搅拌过程中的流场分布直接影响调理效果。采用多重参考系-流体体积模型对实验室污泥调理罐(内径为40 cm)的流场特性进行计算流体力学(computational fluid dynamics

CFD)模拟研究

验证了实验室调理罐模型气液两相分布情况。实验室调理罐的模拟结果表明:单层直桨叶调理罐的搅拌桨直径与调理罐内径比优化值为1:1.75

挡流板宽度与调理罐内径比优化值为1:20

可有效消除流体旋涡

增强湍动作用。在此基础上

对中试调理罐(内径为110 cm)的流场特性进行模拟并与实际测量值校验。该研究采用的多重参考系-流体体积模型可为同类污泥调理罐设计与优化提供参考。

Abstract

Chemical conditioning is commonly used before the mechanically dewatering process for sewage sludge. The flow field distribution of conditioning tank has a significant effect on conditioning when paddles are operating. Moving reference frame-volume of fluid model was used for simulating flow field distribution of a sludge conditioning tank with the inner diameter of 40 cm by CFD (computational fluid dynamics) technology

and the gas-liquid two-phase distribution was verified. The results showed that in the single straight blade paddle conditioning tank

the optimium ratio of paddle diameter to tank diameter was 1:1.75 and the optimum ratio of baffle width to tank diameter was 1:20. Under these optimum conditions

the fluid swirl could be effectively eliminated and the turbulent action could be enhanced. Furthermore

the flow field distribution simulation was conducted for pilot-scale conditioning tank with the inner diameter of 110 cm and the simulation results were compared with test results. Moving reference frame-volume of fluid model used in this study can provide references for design and optimization of similar sludge conditioning tank.

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