丁浩1,
蒋竹荷1,
袁海光1
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
CAO Xiuqin1,,DING Hao1,
JIANG Zhuhe1,
YUAN Haiguang1
1.Key Laboratory of Urban Storm Water System and Water Environment, Ministry of Education, Beijing University of Civil Engineering and Architecture, Beijing 100044, China
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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。
关键词: 热水解污泥/
厌氧消化/
CFD模拟/
搅拌性能/
流场分析
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.
Key words:thermal-hydrolyzed sludge/
anaerobic digestion/
CFD simulation/
mixing performance/
flow field analysis.
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刊出日期:2018-01-14
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液-液射流搅拌提高热水解污泥混合性能分析
曹秀芹1,,丁浩1,
蒋竹荷1,
袁海光1
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)
关键词: 热水解污泥/
厌氧消化/
CFD模拟/
搅拌性能/
流场分析
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。
English Abstract
Analysis of liquid-liquid jet agitation improving mixing performance with thermal-hydrolyzed sludge
CAO Xiuqin1,,DING Hao1,
JIANG Zhuhe1,
YUAN Haiguang1
1.Key Laboratory of Urban Storm Water System and Water Environment, Ministry of Education, Beijing University of Civil Engineering and Architecture, Beijing 100044, China
Keywords: thermal-hydrolyzed sludge/
anaerobic digestion/
CFD simulation/
mixing performance/
flow field analysis
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.
