滤袋式过滤器过流压降变化规律研究

发布时间：2018-06-15 21:31

本文选题：过滤器 + 压降　；参考：《东北石油大学》2017年硕士论文

【摘要】：目前,袋式过滤器广泛应用于各领域,袋式过滤器在使用过程中,为了保证其过滤效果需要不间断的对过滤器进出口的压差进行测量,当二者之间压差不满足其过滤要求时,将严重影响过滤器的过滤效果,因此,对过滤袋的压降进行仿真分析,判断影响压降的主要因素,给出其压降变化规律,并根据预测及时更换滤袋,保证过滤器的高效工作,有助于袋式过滤器在油田领域的广泛应用。本文通过建立流体流动数学模型,考虑流体在过滤器中的流动状态为湍流流动,因此,建立了湍流流动状态下流体动力学模型,对其流动状态进行分析。并对所建模型进行自适应四面体网格的划分,网格划分采用ANSYS ICEM CFD软件,主要对过滤器的通流部分进行了网格细化,并对划分后的网格进行质量检查,使过滤器的主要部件的网格性能能够满足CFX(计算流体动力学软件)对网格质量的要求,有利保证有限元计算的精度。在此基础上通过CFX数值仿真软件对流体流动状态进行数值计算,进而得到过滤器的压降影响因素。通过对孔隙度-速度矢量分布图、孔隙度-总压分布图、孔隙度-流线分布图进行分析,建立了孔隙度压降相关性曲线图,并分析孔隙度对压降的影响规律。采用相同的方法绘制出口压力、出口流速、粘性等与压降的相关性曲线,进而对单过滤袋的压降影响规律进行分析。通过计算可知:单过滤袋及五过滤袋的压降随孔隙度、出口压力、出口流量及粘度的变化规律基本相同。过滤器内部压降随着孔隙度的增加呈现出先增加后减小的趋势,但从整体上体来说,总压损失变化较小。随着出口压力增加,过滤袋内的压降逐渐增加,当出口压力增加到1.5MPa后,压力逐渐趋于稳定,压降无明显变化。随着出口流速的增加,压力损失急剧增加,二者相关性近似为线性。随着粘度的增加,压力降增加,整体曲线近似线性地正比例增加。
[Abstract]:At present, bag filter is widely used in various fields. In order to ensure the filtering effect of bag filter, it is necessary to measure the pressure difference of filter inlet and outlet continuously in order to ensure its filtering effect, when the pressure difference between them does not meet its filtration requirements. Therefore, the pressure drop of the filter bag is simulated and analyzed, the main factors affecting the pressure drop are judged, the variation law of the pressure drop is given, and the filter bag is replaced in time according to the prediction to ensure the high efficiency of the filter. It is helpful for the wide application of bag filter in the field of oil field. In this paper, a mathematical model of fluid flow is established, considering that the flow state of a fluid in a filter is turbulent flow. Therefore, a hydrodynamic model in turbulent flow state is established, and its flow state is analyzed. The model is divided into adaptive tetrahedron mesh. ANSYS ICEM CFD software is used to divide the mesh. The flow section of the filter is refined, and the quality of the divided mesh is checked. The mesh performance of the main components of the filter can meet the requirements of CFX (computational fluid dynamics software) for mesh quality, which is beneficial to ensure the accuracy of finite element calculation. On this basis, the fluid flow state is numerically calculated by CFX numerical simulation software, and the influence factors of filter pressure drop are obtained. Based on the analysis of porosity velocity vector distribution, porosity total pressure distribution and porosity streamline distribution, the correlation curve of porosity pressure drop is established, and the influence of porosity on pressure drop is analyzed. The correlation curves of outlet pressure, outlet velocity, viscosity and pressure drop were drawn by the same method, and the influence law of pressure drop on single filter bag was analyzed. The pressure drop of single filter bag and five filter bag is basically the same with porosity, outlet pressure, outlet flow rate and viscosity. The internal pressure drop of the filter increases first and then decreases with the increase of porosity, but the total pressure loss changes little from the whole upper body. With the increase of the outlet pressure, the pressure drop in the filter bag increases gradually. When the outlet pressure increases to 1.5 MPA, the pressure gradually tends to stabilize, and the pressure drop has no obvious change. With the increase of outlet velocity, the pressure loss increases sharply, and the correlation between them is approximately linear. With the increase of viscosity, the pressure drop increases, and the integral curve increases linearly in proportion.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE937

【参考文献】