双吸渣浆泵设计与内部流场数值模拟

发布时间：2018-11-05 09:06

【摘要】：渣浆泵广泛用于矿山、电力、冶金、煤炭、烟气脱硫、环保等行业,用于输送含有悬浮固体物的浆体。渣浆泵从工作原理上讲属于离心泵。按照吸入进水的方式可分为单吸渣浆泵和双吸渣浆泵。双吸渣浆泵叶轮是由对称的两个单吸叶轮构成,水流通过两侧进口进入叶轮,其流量是单吸渣浆泵的两倍。传统的渣浆泵主要采用清水设计理论,由于清水和固液两相液体的物性差异极大,因此传统的渣浆泵存在效率低和使用寿命短等问题。为了解决渣浆泵目前所存在的问题,本文采用计算机辅助设计方法对双吸渣浆泵进行设计,并用Fluent软件进行流场的三维数值模拟分析,对模拟结果进行较为深入的探讨,分析了渣浆泵的内外特性,最后对双吸渣浆泵进行了优化。本文主要工作如下:(1)查阅相关文献,了解渣浆泵的使用现状、存在的问题以及CFD技术在渣浆泵数值模拟中的应用。(2)采用计算机辅助设计方法对双吸渣浆泵进行设计,得出叶轮和蜗壳的水力图,并运用Solidworks对其进行三维建模,使用ANSYS ICEM软件八叉树(Robust)方法生成四面体非结构网格。(3)采用Fluent软件对双吸渣浆泵进行了定常数值模拟,得到了双吸渣浆泵输送清水介质和固液两相流介质情况下内部流场的压力分布图和速度分布图,以及输送固液两相流介质情况下内部流场的固相浓度分布图。根据输送不同流量清水介质情况下的模拟结果,预测了流量—扬程、流量—功率和流量—效率曲线。(4)针对流量—扬程曲线有驼峰的数值模拟结果,通过改变叶片出口角和叶轮出口宽度,对双吸渣浆泵进行了优化设计。优化后驼峰现象消失,泵的扬程曲线变化也较为平缓,整体上高效区的宽度也大于优化前。
[Abstract]:Slurry pump is widely used in mining, electric power, metallurgy, coal, flue gas desulfurization, environmental protection and other industries. Slurry pump from the working principle of the centrifugal pump. According to the way of suction water, it can be divided into single suction slurry pump and double suction slurry pump. The impeller of double suction slurry pump is composed of two symmetrical single suction impellers, and the flow flows into the impellers through the inlet of both sides, and its flow rate is twice that of single suction slurry pumps. The traditional slurry pump mainly adopts the clean water design theory. Because of the great difference between the physical properties of clean water and solid-liquid two phase liquid, the traditional slurry pump has the problems of low efficiency and short service life. In order to solve the problems existing in the slurry pump, this paper adopts the method of computer aided design to design the double-suction slurry pump, and carries on the three-dimensional numerical simulation analysis of the flow field with Fluent software, and makes a deep discussion on the simulation results. The internal and external characteristics of slurry pump are analyzed, and the double suction slurry pump is optimized. The main work of this paper is as follows: (1) referring to the relevant literature to understand the application of slurry pump, The existing problems and the application of CFD technology in the numerical simulation of slurry pump. (2) the double suction slurry pump is designed by using computer aided design method, and the water force of impeller and volute is obtained, and the 3D modeling is carried out by using Solidworks. ANSYS ICEM software octree (Robust) method is used to generate tetrahedral unstructured meshes. (3) A steady numerical simulation of double-suction slurry pump is carried out by using Fluent software. The pressure distribution and velocity distribution of the internal flow field in the case of water and solid liquid two-phase flow media and the solid concentration distribution diagram of the internal flow field in the case of conveying the solid-liquid two-phase flow medium by the double-suction slurry pump are obtained. According to the simulation results of different flow-flow media, the flow-head, flow-power and flow-efficiency curves are predicted. (4) the numerical simulation results of the flow-head curve with hump are given. By changing the blade outlet angle and impeller outlet width, the double suction slurry pump was optimized. After optimization, the hump disappears, the lift curve changes slowly, and the width of the high efficiency zone is larger than that before optimization.
【学位授予单位】：江苏科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TH311

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