双层侧进式搅拌槽内流场特性数值模拟
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摘要
采用计算流体动力学方法对烟气脱硫过程中吸收塔浆液池的流场特性进行了数值模拟研究,分析了相同转速下双层侧进式搅拌器安装水平偏角θ、竖直偏角φ、离底高度C_1和层间距C_2对搅拌槽内流场的影响。模拟结果表明,安装双层侧进式搅拌器能够增强流体的上下流动,在θ=5°、φ=10°、C_1=0.13 m和C_2=0.5 m时搅拌槽内流场分布相对较好。模拟计算出的搅拌器功率准数N_p与理论公式计算值相比最大误差为3.1%,验证了数值模拟方法的准确性。研究结果可为该类搅拌槽的设计和优化提供参考。
Flow field distribution in stirred slurry tank of absorption tower in flue gas desulfurization was analyzed by numerical simulation method. The effects of different installation angles θ,φ,bottom height C_1 and layer spacing C_2 on the flow field with the double side-entry stirred tank at the same speed were analyzed. The simulation results show that vertical flow of the fluid increases when the stirred tank installed at the double side-entry stirred tank. The result shows that the best optimum parameters are as follows:θ=5°,φ=10°,C_1=0.13 m and C_2=0.5 m. The power numbers N_p were obtained by numerical simulation,comparison with the power number of theoretical formula calculation and the value of the maximum error was 3.1%. The conclusions will provide reference implications for the design and optimization of the double side-entry stirred tank.
Flow field distribution in stirred slurry tank of absorption tower in flue gas desulfurization was analyzed by numerical simulation method. The effects of different installation angles θ,φ,bottom height C_1 and layer spacing C_2 on the flow field with the double side-entry stirred tank at the same speed were analyzed. The simulation results show that vertical flow of the fluid increases when the stirred tank installed at the double side-entry stirred tank. The result shows that the best optimum parameters are as follows:θ=5°,φ=10°,C_1=0.13 m and C_2=0.5 m. The power numbers N_p were obtained by numerical simulation,comparison with the power number of theoretical formula calculation and the value of the maximum error was 3.1%. The conclusions will provide reference implications for the design and optimization of the double side-entry stirred tank.
引文
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[16] 曹宇,董金善,曾子杨.不同挡板数搅拌槽内流场模拟[J].石油化工设备,2018,47(2):7-11.CAO Y,DONG J S,ZENG Z Y.Flow field simulation in the stirred tanks with baffles of different numbers[J].Petro-chemical equipment,2018,47(2):7-11.
[17] 冯连芳,赵轶,顾雪萍,等.卧式双轴T型搅拌器在非牛顿流体中的搅拌功率特性[J].化学反应工程与工艺,2000,16(4):331-336.FENG L F,ZHAO Y,GU X P,et al.Power consumption of horizontal two-shaft T-shape self-cleaning agitators in the non-Newtonian fluid[J].Chemical reaction engineering and technology,2000,16(4):331-336.
[2] Saeed S,Ein Mozaffari F,Upreti S R.Using computational fluid dynamic modeling and ultrasonic doppler velocimetry to study-pulp suspension mixing[J].Industrial and engineering chemistry research,2007,46(7):2172-2179.
[3] 陈佳,肖文德.大型侧进式搅拌釜内湍流流场的数值模拟[J].化学工程,2013(8):38-42,70.CHEN J,XIAO W D.Numerical simulation of turbulent flow field in industrial-scale side-entering stirred tank[J].Chemical engineering(China),2013(8):38-42,70.
[4] 崔娜,周国忠,李伟,等.烟气脱硫吸收塔底部浆液池内流场特性的数值模拟[J].化学反应工程与工艺,2009,25(2):126-131.CUI N,ZHOU G Z,LI W,et al.Numerical simulation of flow field in the slurry pond of a flue-gas desulfurization tower[J].Chemical reaction engineering and technology,2009,25(2):126-131.
[5] 张林进,陈功国,叶旭初.侧进式搅拌反应器内流场的数值模拟[J].化学反应工程与工艺,2011,27(2):97-102.ZHANG L J,CHEN G G,YE X C.Numerical simulation of flow field in side-entering stirred reactor[J].Chemical reaction engineering and technology,2011,27(2):97-102.
[6] 刘冠一.侧入式搅拌中固液悬浮的数值模拟[D].济南:山东大学,2010.LIU G Y.Simulation of solid-liquid suspension in stirred vessels with side-entering agitators[D].Jinan:Shandong University,2010.
[7] 梁敬福,黄振峰,李欣欣.大型沼气厌氧池侧进式搅拌流场的数值模拟分析[J].化学反应工程与工艺,2017,33(1):82-89.LIANG J F,HUANG Z F,LI X X.Numerical simulation of side inlet mixing flow field in large scale biogas tank[J].Chemical reaction engineering and technology,2017,33(1):82-89.
[8] 方键,桑芝富,杨全保.侧进式搅拌器三维流场的数值模拟[J].石油机械,2009,37(1):30-34.FANG J,SANG Z F,YANG Q B.Numerical simulation of 3-D flow field in side-entering agitator[J].China petroleum machinery,2009,37(1):30-34.
[9] 方键.侧进式搅拌槽内多相流动与混合性能的研究[D].南京:南京工业大学,2012.FANG J.Study on flow and mixing characteristics of multi-phase in a side-entry stirred tank[D].Nanjing:Nanjing University of Technology,2012.
[10] 陈功国,张林进,柏杨,等.侧入式搅拌槽中桨叶参数对流场及功率影响的数值模拟[J].北京化工大学学报(自然科学版),2012,37(6):29-34.CHEN G G,ZHANG L J,BAI Y,et al.Numerical simulation of the influence of the agitator parameter on the field characteristics and the power in a side-entering stirred reactor[J].Journal of Beijing university of chemical technology(Natural science edition),2012,37(6):29-34.
[11] 梁家勇,周勇军,卢源,等.双层侧进式搅拌槽固液流动研究[J].轻工机械,2015,33(4):35-38.LIANG J Y,ZHOU Y J,LU Y,et al.Research of solid-liquid flow in a double side-entry stirred tank[J].Light industry machinery,2015,33(4):35-38.
[12] Kasat G R,Khopkar A R,Ranade V V.CFD simulation of liquid-phase mixing in solid-liquid stirred reactor[J].Chemical engineering science,2008,63(15):3877-3885.
[13] 党林贵,郭淑雪,王定标,等.不同组合桨搅拌器搅拌特性的数值研究[J].郑州大学学报(工学版),2013(3):59-62,80.DANG L G,GUO S X,WANG D B,et al.Numerical study of mixing characteristics in stirred tanks with different impeller combinations[J].Journal of Zhengzhou university(Engineering science),2013(3):59-62,80.
[14] 李刚,周勇军,陈明濠.基于计算流体动力学的搅拌浆液箱的结构优化[J].湿法冶金,2014,33(1):75-78.LI G,ZHOU Y J,CHEN M H.Structure optimization for stirring slurry tank by computational fluid dynamics[J].Hydrometallurgy of China,2014,33(1):75-78.
[15] 梁佳赟,王杰,郝惠娣,等.六斜叶圆盘搅拌桨的龙卷流型搅拌效能分析[J].中国科技论文,2016(23):2667-2671.LIANG J Y,WANG J,HAO H D,et al.Effect analysis in tornado flow stirred vessel with six oblique leaf disc impeller[J].China science paper,2016(23):2667-2671.
[16] 曹宇,董金善,曾子杨.不同挡板数搅拌槽内流场模拟[J].石油化工设备,2018,47(2):7-11.CAO Y,DONG J S,ZENG Z Y.Flow field simulation in the stirred tanks with baffles of different numbers[J].Petro-chemical equipment,2018,47(2):7-11.
[17] 冯连芳,赵轶,顾雪萍,等.卧式双轴T型搅拌器在非牛顿流体中的搅拌功率特性[J].化学反应工程与工艺,2000,16(4):331-336.FENG L F,ZHAO Y,GU X P,et al.Power consumption of horizontal two-shaft T-shape self-cleaning agitators in the non-Newtonian fluid[J].Chemical reaction engineering and technology,2000,16(4):331-336.