环隙式离心萃取机内部全流场CFD数值模拟研究

发布时间：2019-06-08 11:36

【摘要】：离心萃取是一种新型分离技术,环隙式离心萃取机正是一种利用这一技术实现萃取和分离目的的新式设备,由于其具有结构紧凑、处理能力大、效率高、功耗低、清洗维护方便等优点,近年来,被越来越多的应用于核工业、制药、冶金、石油化工等行业,发展十分迅速。本文采用CFD数值模拟和PIV测试验证的方法对环隙式离心萃取器内部环隙和转筒区域内的流场进行了全面而详细的研究,揭示了环隙区域泰勒涡流的形态及其变化过程,研究了转速、流量等操作条件对环隙区域流场的影响,揭示了转筒区域内流场中各相的分布及流场的形态、三维速度场和压力场的变化以及影响流动特性参数等,探讨了底部叶片对流场的影响以及转筒内部的角速度滞后现象。研究表明,转速对于环隙式离心萃取机内部流场影响较大,尤其是对环隙区域泰勒涡流的影响,.流量的影响相对较小,得出转速为1000r/min、流量60L/h左右为比较理想的工况,底部叶片对于转筒入口区域流场影响较大,螺旋形叶片更加适用。转筒内部产生角速度滞后与超前现象,转速对入口区域的角速度滞后影响较小,对筒体区域的角速度滞后影响较大。
[Abstract]:Centrifugal extraction is a new type of separation technology. Annular centrifugal extractor is a new type of equipment to realize the purpose of extraction and separation by using this technology. Because of its compact structure, high processing ability, high efficiency and low power consumption, centrifugal extraction is a new type of separation technology. In recent years, cleaning and maintenance are more and more used in nuclear industry, pharmaceutical, metallurgy, petrochemical and other industries, the development is very rapid. In this paper, CFD numerical simulation and PIV test are used to study the flow field in the annular gap and rotating cylinder area of the annular centrifugal extractor in detail, and the morphology and variation process of Taylor vortex in the annular gap region are revealed. The effects of rotating speed and flow rate on the flow field in the annular gap region are studied, and the distribution of each phase in the flow field in the rotating cylinder area, the shape of the flow field, the changes of the three-dimensional velocity field and the pressure field, and the parameters affecting the flow characteristics are revealed. The influence of the bottom blade on the flow field and the angular velocity lag in the rotating cylinder are discussed. The results show that the rotating speed has a great influence on the flow field in the annular centrifugal extractor, especially on the Taylor vortex in the annular gap region. The influence of flow rate is relatively small, it is concluded that the rotating speed is 1000R / min, the flow rate 60L/h is about ideal working condition, the bottom blade has great influence on the flow field in the inlet area of the rotating cylinder, and the spiral blade is more suitable. The angular velocity lag and advance phenomenon occur in the rotating cylinder, and the rotational speed has little effect on the angular velocity lag in the inlet area, but has a great influence on the angular velocity lag in the cylinder area.
【学位授予单位】：华东理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ051.8

【参考文献】