高温高压对冶金用热水循环泵结构强度的影响

Effect of high temperature and pressure on structural strength of metallurgical hot water circulating pump

为获得冶金用热水循环泵实际工作状态下的结构强度,对泵内部全流场进行了多工况定常数值模拟,并基于ANSYS Workbench平台对泵转动部件与静止部件进行了单向流固耦合计算.得到了不同工况下关键零件的最大等效应力,并对比了常温常压与高温高压条件下转动部件与静止部件的应力分布,分析了结构应力分布特征.结果表明:热水循环泵各零件最大等效应力值均小于自身材料的抗拉强度,满足强度要求;常温常压条件下,转动部件的键及键槽处应力值最大,而在高温高压条件下,泵轴轴承段因热载荷出现了应力集中的现象;常温常压条件下,泵体应力分布主要受到重力作用,各支撑部位的应力较大,高温高压条件下,泵体温度梯度较大位置应力较大.

To obtain structural strength of metallurgical hot water circulation pump under actual working conditions ,the steady numerical simulation of whole flow field at multi conditions was calcu‐lated ,and based on the ANSYS Workbench platform ,the one‐way fluid‐structure interaction of rotat‐able and stationary parts of pump were performed .Rotatable and stationary parts at high temperature and pressure conditions of the stress distribution were contrasted with normal conditions ,and the im‐pact of various types of loads on structural strength was analyzed .The results indicate that the maxi‐mum equivalent stress value of all parts of the pump is less than the tensile strength of its materials , which can meet the strength requirement .At normal temperature and pressure conditions ,the maxi‐mum stress of the rotating part is at the key and the keyway ,while at high temperature and pressure conditions ,the shaft bearing segment of the pump appears stress concentration due to the thermal load .At normal conditions ,the supporting parts bear high stress ,while at high temperature and pressure conditions ,the high stress appears in the greater temperature gradient of the casing .