卧式螺旋卸料沉降离心机流场数值模拟及分离效果的研究

发布时间：2018-07-15 09:40

【摘要】：螺旋卸料沉降离心机是利用离心沉降原理对非均相混合物进行分离的机械设备，具有连续送料、处理量大、耗电量少、适应性强等特点，因此，在工业生产中应用非常广泛。近年来随着科学技术的发展，沉降离心机的研制也得到了较大的发展，特别在结构和品种上发展较为迅速，但在对螺旋卸料沉降离心机内部流场理论方面的研究还相对比较薄弱。本文先应用三维设计软件Solidworks对LWB350型卧式螺旋卸料沉降离心机零部件进行三维实体建模，并在Solidworks装配体模块中完成整机的虚拟装配。根据卧螺离心机物料的流动特点，对流动域作了合理的简化，应用计算流体动力学软件Fluent对其进行了数值模拟研究。通过比较不同湍流模型的适用范围和计算需求，选择了雷诺应力模型进行求解计算。在深入了解卧螺离心机的基础之上，模拟研究了不同参数情况下的流场，，得到了离心机流场的静压、动压以及速度分布。在此基础上，针对离心机处理的悬浮液固相体积分数小于10％的情况，选择离散相模型分析液固两相流动。根据离心机内固液分离过程的数值模拟分析结果，探讨流量、转速等参数对分离效果的影响；并完成卧螺离心机生产能力的相关计算。
[Abstract]:Spiral discharge settling centrifuge is a mechanical equipment which uses centrifugal settlement principle to separate heterogeneous mixtures. It has the characteristics of continuous feeding, large amount of treatment, less power consumption, and strong adaptability. Therefore, it is widely used in industrial production. In recent years, with the development of science and technology, the development of settling centrifuge has also been greatly developed. Especially in structure and variety, the research on the internal flow field of helical discharge centrifuge is relatively weak.
This paper first uses three-dimensional design software Solidworks to build 3D solid modeling of LWB350 horizontal spiral unloading centrifuge parts, and complete the virtual assembly of the whole machine in the Solidworks assembly module.
According to the flow characteristics of the material of the snail centrifuge, a reasonable simplification of the convective domain is made. The numerical simulation study of the fluid dynamics software Fluent is carried out by using the computational fluid dynamics software. The Reynolds stress model is selected for the calculation by comparing the applicable range of the different turbulence models and the calculation demand. The flow field under different parameters is simulated and the static pressure, dynamic pressure and velocity distribution of the centrifuge flow field are obtained. On this basis, the discrete phase model is selected to analyze the liquid solid two phase flow in the case of the volume fraction of the solid phase of the centrifuge treated by the centrifuge is less than 10%.
According to the numerical simulation analysis results of the separation process in the centrifuge, the influence of the parameters of the flow and speed on the separation effect is discussed, and the related calculation of the production capacity of the decanter centrifuge is completed.
【学位授予单位】：辽宁科技大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH244

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