基于流固耦合的减压塔底泵泵体强度分析

Strength Analysis of Decompression Tower Bottom Pump's Pump Casing Based on Fluid-solid Coupling

减压塔底泵是炼油装置中的关键设备,基于流固耦合的有限元分析方法可以检验泵体的可靠性。采用Pro/Engineer软件对泵体及整机水体三维造型,采用ICEM-CFD软件对整机水体三维造型划分网格,再采用CFX软件对泵内部全流场进行定常数值计算,采用CFX软件和ANSYS Workbench软件对泵内部全流场和泵体进行流固耦合单项计算。采用ANSYSWorkbench软件后处理工具导出各节点的坐标、应力值和总变形量。得到5种不同流量工况下泵体多个截面的应力、变形分布云图。利用表格对5种流量工况下泵体最大应力的位置和最大总变形的位置进行对比,对5种流量工况下泵体的最大应力、最小应力、最大应变、最小应变和最大总变形进行对比。结果表明,流量的改变对泵体的应力分布和应变分布影响很小,泵体最大应力点的应力小于材料2Cr13的强度极限,泵体满足强度条件要求。

Decompression tower bottom pump is the important equipment in oil refining equipment. The finite-element analysis based on fluid-solid coupling is used to check pump casing＇ reliability. The three-dimensional models include pump casing and fluid domains in pump are made by Pro/Engineer. The meshes of fluid domains in pump are made by ICEM-CFD. The steady flow field inside pump which include front pump cavity and back pump cavity is calculated numerically by CFX. The flow field and pump casing are singly fluid-solid coupling calculated by CFX and ANSYS Workbench. Every panel point＇s coordinate, stress and total deformation are exported by the post processing tool of ANSYS Workbench. The pump casing＇s stress distribution cloud pictures and the pump body＇s total deformation distribution cloud pictures in five working conditions of different flows are gotten. The maximum stress point＇s location and the maximum total deformation＇s location in five working conditions of different flows are comparisoned through table. The maximum stress, the minimum stress, the maximum strain, the minimum strain and the maximum total deformation are compared through table. The result show that the pump casing＇s stress distribution and strain distribution is scarcely changed in different flows. The maximum stress of the pump casing is less than 2Cr13＇s limit strength. Pump casing fit the strength recluirement.