市政污泥化学调理装置CFD模拟

doi:10.11949/j.issn.0438-1157.20150319

化工学报 ›› 2015, Vol. 66 ›› Issue (10): 4145-4154.DOI: 10.11949/j.issn.0438-1157.20150319

市政污泥化学调理装置CFD模拟

许琪¹, 邓超¹, 时亚飞¹, 徐新宇¹, 虞文波¹, 郦超¹, 陈烨¹, 梁莎¹, 胡敬平¹, 何姝², 王荣², 杨昌柱¹, 杨家宽¹

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

收稿日期:2015-03-16 修回日期:2015-05-09 出版日期:2015-10-05 发布日期:2015-10-05
通讯作者: 杨家宽
基金资助:
教育部科学技术研究项目(113046A);中央高校基本科研业务费专项资金项目(2013TS071)

CFD simulation of chemical conditioning unit of municipal sludge

XU Qi¹, DENG Chao¹, SHI Yafei¹, XU Xinyu¹, YU Wenbo¹, LI Chao¹, CHEN Ye¹, LIANG Sha¹, HU Jingping¹, HE Shu², WANG Rong², YANG Changzhu¹, YANG Jiakuan¹

1 School of Environmental Science &Engineering, Huazhong University of Science &Technology, Wuhan 430074, Hubei, China;
2 Universtar Science &Technology Co., Ltd., Shenzhen 518057, Guangdong, China

Received:2015-03-16 Revised:2015-05-09 Online:2015-10-05 Published:2015-10-05
Supported by:
supported by the Project of Chinese Ministry of Education (113046A) and the Fundamental Research Funds for the Central Universities of Ministry of Education of China (2013TS071).

摘要/Abstract

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。

关键词: 化学调理, 气液两相流, 计算流体力学, 多重参考系方法, 流体体积模型, 搅拌容器

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.

Key words: chemical conditioning, gas-liquid flow, computational fluid dynamics (CFD), moving reference frame, volume of fluid (VOF), stirred vessel

中图分类号:

X705

许琪, 邓超, 时亚飞, 徐新宇, 虞文波, 郦超, 陈烨, 梁莎, 胡敬平, 何姝, 王荣, 杨昌柱, 杨家宽. 市政污泥化学调理装置CFD模拟[J]. 化工学报, 2015, 66(10): 4145-4154.

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. CFD simulation of chemical conditioning unit of municipal sludge[J]. CIESC Journal, 2015, 66(10): 4145-4154.

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市政污泥化学调理装置CFD模拟

CFD simulation of chemical conditioning unit of municipal sludge

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