铅回收搅拌反应器内流体力学行为分析

IF 1.8 Q3 MECHANICS Fluids Pub Date : 2023-09-28 DOI:10.3390/fluids8100268
Adan Ramirez-Lopez
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引用次数: 0

摘要

本文着重对流体动力学进行分析,以提高间歇式铅回收反应器的效率。该研究基于计算流体动力学(CFD)方法,该方法用于求解Navier-Stokes和Fick方程(用于理解流体动力学的连续性和动量方程以及用于理解分布的浓度方程)。所分析的反应器是一个具有圆柱形体和底部为半球的双重几何形状的储罐。该反应器是垂直对称的,带有四个叶片的轴用作叶轮,为驻留流体提供运动。初始驻留流体是静态的,在内部体积中定义示踪剂以测量混合效率,这在实验室和工业实践中都是如此。然后,通过研究不同演化时间的示踪剂浓度曲线,对混合效果进行了评价。为了了解流体流动的流体动力学行为,以确定示踪剂浓度高和低的区域,在水箱的一个确定的控制平面内,在周围的监测点上测量示踪剂的浓度。此外,本研究独立重复评估不同的注射点,以确定最佳的注射点。最后,证明了选择合适的注射点可以减少混合的工作时间,这是一个经济上有吸引力的动机,为改进工业实践提供建议。
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Analysis of the Hydrodynamics Behavior Inside a Stirred Reactor for Lead Recycling
This work focuses on an analysis of hydrodynamics to improve the efficiency in a batch reactor for lead recycling. The study is based on computational fluid dynamics (CFD) methods, which are used to solve Navier–Stokes and Fick’s equations (continuity and momentum equations for understanding hydrodynamics and concentration for understanding distribution). The reactor analyzed is a tank with a dual geometry with a cylindrical body and a hemisphere for the bottom. This reactor is symmetrical vertically, and a shaft with four blades is used as an impeller for providing motion to the resident fluid. The initial resident fluid is static, and a tracer is defined in a volume inside to measure mixing efficiency, as is conducted in laboratory and industrial practices. Then, an evaluation of the mixing is performed by studying the tracer concentration curves at different evolution times. In order to understand the fluid flow hydrodynamics behavior with the purpose of identifying zones with rich and poor tracer concentrations, the tracer’s concentration was measured at monitoring points placed all around in a defined control plane of the tank. Moreover, this study is repeated independently to evaluate different injection points to determine the best one. Finally, it is proved that the selection of an appropriate injection point can reduce working times for mixing, which is an economically attractive motivation to provide proposals for improving industrial practices.
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来源期刊
Fluids
Fluids Engineering-Mechanical Engineering
CiteScore
3.40
自引率
10.50%
发文量
326
审稿时长
12 weeks
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