桨叶类型和溶剂性质对DNT加氢搅拌釜的水力学强化  

Hydrodynamics Intensification of Impellers Types and Solvent Properties on DNT Hydrogenation Stirred Tank

作　　者：杨勇 马雪丽 王凡伟 范宗良[1] 宫源 王东亮 YANG Yong;MA Xueli;WANG Fanwei;FAN Zongliang;GONG Yuan;WANG Dongliang(College of Petrochemical Technology,Lanzhou University of Technology,Lanzhou Gansu 730050,China)

机构地区：[1]兰州理工大学石油化工学院,甘肃兰州730050

出　　处：《当代化工》2025年第1期213-219,共7页Contemporary Chemical Industry

基　　金：中央引导地方科技发展资金项目(项目编号:22ZY1QA011)。

摘　　要：针对二硝基甲苯(DNT)加氢的气液两相搅拌反应器,采用欧拉-欧拉模型和RNG k-ε湍流模型进行描述,研究了3种不同的叶轮类型和5种溶剂性质对加氢搅拌釜的水力学强化效应。结果表明:相比较四叶斜叶式和六叶平直式叶轮,三叶推进式叶轮同时产生显著径向和轴向混合流型,使得搅拌釜内局部气含率更均匀并且整体气含率也最高,有利于DNT加氢反应;增大叶轮转速,搅拌釜内整体气含率逐渐降低,但搅拌功率显著增加;增大气体质量流量釜内整体气含率和叶轮功耗都呈现先增加后降低的趋势,但二者峰值条件不同;选用黏度和密度较小的甲醇、乙醇和环己烷溶剂更有利于促进气液混合效率,并且叶轮功率也较低。综上,针对乙醇溶剂的DNT加氢反应体系,叶轮转速为400 r·min^(-1)、气体质量流率为0.08 kg·h^(-1)时可以保持较高的整体气含率并且搅拌功耗不高。For a gas-liquid two-phase stirred reactor for the hydrogenation of dinitrotoluene(DNT),the hydrodynamic enhancement effects of three different impeller types and five solvent properties on the hydrogenation stirred kettle were investigated using the Eulerian-Eulerian model and the RNG k-ε turbulence model for description.Compared with the four-bladed and six-bladed flat impellers,the three-bladed propeller impeller produced significant radial and axial mixing flow patterns,which resulted in a more homogeneous local gas content and the highest overall gas content in the stirred kettle,which was favorable for the DNT hydrogenation reaction.Increasing the rotational speed of the impeller,the overall gas content in the stirred kettle gradually decreased,but the stirring power increased significantly;increasing the gas mass flow rate of the kettle,the overall gas content and the impeller power consumption showed a trend of increasing and then decreasing,but the peak conditions of the two were different;the selection of methanol,ethanol,and cyclohexane solvents with lower viscosity and density was more conducive to promote the efficiency of gas-liquid mixing,and the power of the impeller was also lower.In conclusion,for the DNT hydrotreating system with ethanol solvent,the impeller speed of 400 r·min^(-1) and gas mass flow rate of 0.08 kg·h^(-1) could maintain a high overall gas content and the stirring power consumption was not high.

关 键 词：DNT加氢 搅拌釜 桨叶 气含率 

分 类 号：TQ027.32[化学工程]