搅拌桨叶距槽底距离对导流筒稀土搅拌槽搅拌特性的影响分析

搅拌桨叶距槽底距离对导流筒稀土搅拌槽的搅拌特性有着至关重要的影响。为了获取桨叶底距对导流筒稀土搅拌槽搅拌特性影响的规律,以江西赣南某稀土企业容积为10m3导流筒搅拌槽数据为模型,利用Solidworks软件建立了导流筒搅拌槽及搅拌桨三维模型,运用Fluent流体仿真软件对其进行了数据处理,并选取了四组桨叶距槽底距离(450、500、550、600mm)试验数据,以甘油水溶液为载体对导流筒稀土搅拌槽料液混合过程进行了仿真模拟,然后以时均速度分布、速度、力矩和搅拌功率数值等参数作为评价依据,对导流筒搅拌槽该参数下的搅拌特性进行了分析评价,仿真试验结果表明:当搅拌桨叶距槽底距离为550mm时,该导流筒搅拌槽内料液轴向循环能力最强,搅拌槽整体流场分布也最好。随后又在现场进行了不同搅拌桨叶距槽底距离下的搅拌特性试验,将模拟结果与现场试验结果进行了对比验证,验证了现场实验结果与模拟分析结论的高度一致性。现场测定了搅拌桨叶距槽底距离为550mm时搅拌力矩为6.56N·m,搅拌功率为8 239W。研究结果将为导流筒搅拌槽的内部结构设计、安装提供理论和实践参考。

Analysis on the Influence of Blade Distance of Impeller on Mixing Characteristics of Rare Earth Stirred Tank with Draft Tube

The distance between impeller blades and the bottom of the tank has a crucial influence on the mixing characteristics of rare earth stirred tank with draft tube. In order to obtain the rule of the influence of blade bottom pitch on the mixing characteristics of rare earth stirred tank with draft tube, this paper takes the data of a rare earth enterprise in southern Jiangxi Province whose volume is 10 m_³ as the model reference, establishes a three-dimensional model of the draft tube stirred tank and the stirred impeller by using Solidworks software, and uses Fluent fluid simulation software to process the data, and chooses four groups of blade pitch to the bottom of the tank. The experimental data (c=450,500,550,600 mm) were used to simulate the mixing process of rare earth mixing tank with glycerol aqueous solution as carrier. Then the mixing characteristics of the mixing tank with the guide tube were analyzed and evaluated based on the parameters of time-averaged velocity distribution, velocity, moment and stirring power. The simulation results show that when the distance between the blades of the impeller and the bottom of the tank is c=550 mm, the axial circulation ability of the material and liquid in the stirred tank with draft tube is the strongest, and the overall flow field distribution of the stirred tank is also the best. The stirring characteristics of different blade spacing at the bottom of the tank were tested in the field. The simulation results were compared with the field test results, and the high consistency between the field test results and the simulation analysis conclusions was verified. The stirring moment is 6.56 N?m and the stirring power is 8239 W when the distance between the blade and the bottom of the tank is 550 mm. The research results will provide theoretical and practical reference for the design and installation of the internal structure of the mixing tank with draft tube.