浓密机给料井结构优化及模拟仿真研究现状

Research Status on Optimization and Simulation of Thickener Feedwell Structure

高效浓密技术具有高效率、占地少及指标良好等优点,作为浓密机的核心部件,给料井对浓密机运行效果影响很大。基于此,从给料井结构优化和计算机模拟仿真实验两方面对给料井的研究现状进行了总结并提出了主要研究方向。结果表明:①给料井是浓密机的核心部件之一,结构合理的给料井能够提升浓密机的运行性能,降低溢流固体含量、提高底流浓度并减少絮凝剂单耗。②稀释给料井内料浆有利于絮凝,合理的剪切率和停留时间能够促进絮凝作用,挡板结构和封闭式排料有利于布料均匀,可调控的稀释结构有利于增强给料井的工艺适应性。③CFD方法模拟实验是研究给料井的有效手段之一。提高模型精度,并采用实验与模拟相互验证方式逐步完善CFD方法,能够为给料井的研究提供强有力的支撑。④强化给料井内的絮凝作用,优化药剂添加位置,利用可调控自稀释技术,提高给料井适应性及利用CFD方法模拟工业全尺度给料井是今后的研究方向。

High-efficiency thickening technology has the advantages of high efficiency,less land area and good indexes,and the feedwell as the core component of thickener has a great impact on its operation.Based on this,the paper summarizes the research status of feedwell from two aspects:optimization of feedwell structure and computer simulation experiment,and puts forward the main research direction.The results showed that:①feedwell is one of the core components of thickener.A well-structured feedwell can improve the operation performance of thickener,reduce the overflow solid content,increase the underflow concentration and reduce the specific consumption of flocculant.②Dilution of slurry in the feedwell is conducive to flocculation,reasonable shear rate and residence time can promote flocculation,baffle structure and closed discharge are conducive to uniform distribution,and adjustable dilution structure is conducive to enhancing the process adaptability of the feedwell.③CFD simulation experiment is one of the effective means to study the feeding well.Improving the model′s accuracy and gradually perfecting CFD method by mutual verification of experiment and simulation can provide a strong support for the research of feedwell.④The future research direction is to strengthen the flocculation in the feedwell,optimize the position of the additive,use the controllable self-dilution technology,improve the adaptability of the feedwell and use CFD method to simulate the industrial full-scale feedwell.