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液-液射流搅拌提高热水解污泥混合性能分析

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曹秀芹, 丁浩, 蒋竹荷, 袁海光. 液-液射流搅拌提高热水解污泥混合性能分析[J]. 环境工程学报, 2018, 12(1): 316-323. doi: 10.12030/j.cjee.201706194
引用本文: 曹秀芹, 丁浩, 蒋竹荷, 袁海光. 液-液射流搅拌提高热水解污泥混合性能分析[J]. 环境工程学报, 2018, 12(1): 316-323. doi: 10.12030/j.cjee.201706194
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CAO Xiuqin, DING Hao, JIANG Zhuhe, YUAN Haiguang. Analysis of liquid-liquid jet agitation improving mixing performance with thermal-hydrolyzed sludge[J]. Chinese Journal of Environmental Engineering, 2018, 12(1): 316-323. doi: 10.12030/j.cjee.201706194
Citation: CAO Xiuqin, DING Hao, JIANG Zhuhe, YUAN Haiguang. Analysis of liquid-liquid jet agitation improving mixing performance with thermal-hydrolyzed sludge[J]. Chinese Journal of Environmental Engineering, 2018, 12(1): 316-323. doi: 10.12030/j.cjee.201706194
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液-液射流搅拌提高热水解污泥混合性能分析

  • 1.

    北京建筑大学城市雨水系统与水环境省部共建教育部重点实验室,北京100044

  • 基金项目:

    北京市教委科技重点项目暨北京市自然科学基金资助项目(KZ201310016017)

    北京建筑大学研究生创新项目资助(PG2017011)

Analysis of liquid-liquid jet agitation improving mixing performance with thermal-hydrolyzed sludge

  • 1.

    Key Laboratory of Urban Storm Water System and Water Environment, Ministry of Education, Beijing University of Civil Engineering and Architecture, Beijing 100044, China

  • Fund Project:

  • 摘要: 在厌氧消化反应器中,机械搅拌是广为应用的搅拌方式,但机械搅拌在运行过程中存在设备维修困难、能耗高等问题。基于前期的研究,利用Ansys 17.2软件平台,构建3 000 m3液-液射流搅拌厌氧消化反应器1∶1仿真模型,为考察液液射流装置对热水解污泥在反应器内的搅拌混合效果,模拟得出速度云图、速度矢量图、剪切速率图以及死区分布图,并对搅拌性能、搅拌机理进行分析。结果表明:流场区域流速范围0~1.50 m·s-1,剪切速率范围0~200 s-1；依据斯托克斯定律计算出该流场中沉降速度阈值0.30 m·s-1,低于该速度值的部分形成死区,死区主要分布在流场中心区域,其体积为600.88 m3,占总体积20.58%；相对于流场中心区域,流场内其他区域流速均值为0.60 m·s-1,得到较好的搅拌混合。
    Abstract: In the anaerobic digestion reactor, mechanical agitation is a widely used method of mixing, but there are difficulties in equipment maintenance and high energy consumption during the operation. Based on the previous research and Ansys 17.2 software platform, 1∶1 simulation model was constructed by simulating 3 000 m3 anaerobic digestion reactor, equipped with liquid-liquid jet device in a sludge centralized treatment station. Velocity vector, shear rate, and dead zone profiles were used to investigate the mixing effect of liquid jet device for thermal-hydrolyzed sludge. The mixing performance and stirring mechanism are also analyzed. As a result, the velocity range of the flow field is from 0 to 1.50 m·s-1 and the shear rate range is from 0 to 2.00 s-1. The sedimentation velocity threshold is 0.30 m·s-1 according to Stokes’s law and the volume of the part below this velocity is 600.88 m3, reaching 20.58% of the total volume. Compared with the center of the flow field, the mean velocity of other regions is 0.60 m·s-1 and the mixing is much better.
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  • 刊出日期:  2018-01-14

液-液射流搅拌提高热水解污泥混合性能分析

  • 1. 北京建筑大学城市雨水系统与水环境省部共建教育部重点实验室,北京100044
基金项目:

北京市教委科技重点项目暨北京市自然科学基金资助项目(KZ201310016017)

北京建筑大学研究生创新项目资助(PG2017011)

摘要: 在厌氧消化反应器中,机械搅拌是广为应用的搅拌方式,但机械搅拌在运行过程中存在设备维修困难、能耗高等问题。基于前期的研究,利用Ansys 17.2软件平台,构建3 000 m3液-液射流搅拌厌氧消化反应器1∶1仿真模型,为考察液液射流装置对热水解污泥在反应器内的搅拌混合效果,模拟得出速度云图、速度矢量图、剪切速率图以及死区分布图,并对搅拌性能、搅拌机理进行分析。结果表明:流场区域流速范围0~1.50 m·s-1,剪切速率范围0~200 s-1；依据斯托克斯定律计算出该流场中沉降速度阈值0.30 m·s-1,低于该速度值的部分形成死区,死区主要分布在流场中心区域,其体积为600.88 m3,占总体积20.58%；相对于流场中心区域,流场内其他区域流速均值为0.60 m·s-1,得到较好的搅拌混合。

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