液液射流装置的搅拌混合效果
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摘要
以活性污泥、消化污泥为研究对象,分析液液射流搅拌装置对这两种污泥在搅拌槽内混合效果;同时利用计算流体力学软件ANSYS Fluent 15.0模拟了在入射压力为226 043 Pa工况下,射流搅拌装置的工作性能。该入射压力下,液液喷嘴泵送活性污泥时入射流量314.57 m~3/h,入射速度为3.37 m/s,消化污泥入射流量为312.05 m~3/h,入射速度为3.20 m/s。模拟结果表明在液液喷嘴内部搅拌混合效果不受流体性质的影响,均得到很好的搅拌混合;但在搅拌槽内活性污泥的搅拌混合效果明显优于消化污泥,搅拌槽内活性污泥流速方差加权平均值f为144.24,死区的体积分数φ为13.33%,平均流速为0.108 2 m/s,消化污泥在搅拌槽内的平均流速为0.031 8 m/s。
The effects of the mixing of the two kinds of sludge in the agitated tank were analyzed with the activated sludge and digested sludge as the research objects. ANSYS Fluent 15. 0 was used to simulate the performance of the jet mixing device under the condition of the incident pressure of 226 043 Pa. The incident flow rate of the activated sludge was 314. 57 m~3/h,the incident velocity was 3. 37 m/s,the digested sludge flow rate was 312. 05 m~3/h,the incident velocity was 3. 20 m/s. The simulation results show that the mixing effect is not affected by the nature of the fluid in the liquid-liquid nozzle inside,and all of them are well stirred and mixed. But in the stirring tank activated sludge mixing and mixing effect is better than digestive sludge,the mean flow velocity of the activated sludge in the stirred tank was 144. 24,the volume fraction of the dead zone was 13. 33%,the average flow velocity was 0. 108 2 m/s,the average velocity of the digested sludge in the stirred tank was 0. 031 8 m/s
The effects of the mixing of the two kinds of sludge in the agitated tank were analyzed with the activated sludge and digested sludge as the research objects. ANSYS Fluent 15. 0 was used to simulate the performance of the jet mixing device under the condition of the incident pressure of 226 043 Pa. The incident flow rate of the activated sludge was 314. 57 m~3/h,the incident velocity was 3. 37 m/s,the digested sludge flow rate was 312. 05 m~3/h,the incident velocity was 3. 20 m/s. The simulation results show that the mixing effect is not affected by the nature of the fluid in the liquid-liquid nozzle inside,and all of them are well stirred and mixed. But in the stirring tank activated sludge mixing and mixing effect is better than digestive sludge,the mean flow velocity of the activated sludge in the stirred tank was 144. 24,the volume fraction of the dead zone was 13. 33%,the average flow velocity was 0. 108 2 m/s,the average velocity of the digested sludge in the stirred tank was 0. 031 8 m/s
引文
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11 Baharak S,Abdul A A,Rajarathinam P.Fluid dynamic analysis of non-Newtonian flow behavior of municipal sludge simulant in anaerobic digesters using submerged,recirculating jets.Chemical Engineering Journal,2016;298:259-270
12 P.Amparo L J,Juan E G,Tatiana M M,et al.Application of CFDmethods to an anaerobic digester:the case of ontinyent WWTP,Valencia,Spain.Journal of Water Process Engineering 2015;7:131-140
13 Tal F B,Frylewicz K B.The influence of temperature and sludge solids content on the values of rheological parameters of sludge.Inzynieria Chemiczna I Procesowa 2004;25(3):1689-1694
14 Mori M,Isaac J,Seyssiecq I,et al.Effect of measuring geometries and of exocellular polymeric substances on the rheological behaviour of sewage sludge.Chemical Engineering Research and Design 2008;86(6):554-559
2禹言芳,吴剑华,孟辉波.新型循环射流混合器湍流特性分析.过程工程学报,2011;11(1):1-8Yu Yanfang,Wu Jianhua,Meng Huibo.Turbulent characteristics of a novel circulating jet mixer.The Chinese Journal of Process Engineering,2011;11(1):1-8
3 Rahimi M,Parvareh A.CFD study on mixing by coupled jet-impeller mixers in a large crude oil storage tank.Computers and Chemical Engineering,2007;31(7):737-744
4王乐勤,林思达,田艳丽,等.基于CFD的大流量喷嘴喷射性能研究.流体机械,2008;36(11):17-22Wang Yueqin,Lin Sida,Tian Yanli,et al.Study on great flow nozzle performance with CFD method.Fluid Machinery 2008;36(11):17-22
5熊向峰,贾丽娟,宁平,等.射流搅拌提高牛粪中温厌氧发酵产沼气性能.农业工程学报,2015;31(19):222-227Xiong Xiangfeng,Jia Lijuan,Ning Ping,et al.Jet mixing improving biogas production performance of mesophilic anaerobic fermentation with cow manure.Transactions of the Chinese Society of Agricultural Engineering,2015;31(19):222-227
6曹秀芹,赵振东,杨平,等.污泥厌氧消化反应器搅拌性能的CFD模拟.给水排水,2016;42(3):137-141Cao Xiuqin,Zhao Zhendong,Yang Ping,et al.Simulation of mixing performance of sludge anaerobic digestion reactor by CFD method.Water&Wastewater Engineering 2016;42(3):137-141
7 Wu B.CFD analysis of mechanical mixing in anaerobic digesters.Transactions of the ASABE 2009;52(4):1371-1382
8 Wu B.CFD simulation of mixing in egg-shaped anaerobic digesters.Water Research.2010;44(5):1507-1519
9 Wu B.CFD simulation of gas mixing in anaerobic digesters.Computers and Electronics in Agriculture.2014;109:278-286
10 Wu B.CFD simulation of gas and non-Newtonian fluid two-phase flow in anaerobic digesters.Water Research 2010;44(13):3861-3874
11 Baharak S,Abdul A A,Rajarathinam P.Fluid dynamic analysis of non-Newtonian flow behavior of municipal sludge simulant in anaerobic digesters using submerged,recirculating jets.Chemical Engineering Journal,2016;298:259-270
12 P.Amparo L J,Juan E G,Tatiana M M,et al.Application of CFDmethods to an anaerobic digester:the case of ontinyent WWTP,Valencia,Spain.Journal of Water Process Engineering 2015;7:131-140
13 Tal F B,Frylewicz K B.The influence of temperature and sludge solids content on the values of rheological parameters of sludge.Inzynieria Chemiczna I Procesowa 2004;25(3):1689-1694
14 Mori M,Isaac J,Seyssiecq I,et al.Effect of measuring geometries and of exocellular polymeric substances on the rheological behaviour of sewage sludge.Chemical Engineering Research and Design 2008;86(6):554-559