摘要
换热器管板等效方法影响到管板受力变形计算的准确性。以管壳式换热器为例,分别建立了开孔管板结构、共用节点的实心管板结构和主从节点绑定的实心管板结构有限元模型。采用数值计算方法,对管板的应力和变形进行了分析。有限元计算结果表明:采用主从节点绑定的实心管板结构与开孔管板结构变形最大相对误差为8.4%、孔边应力相对误差超过60%,说明主从节点绑定的实心管板结构仅可准确描述管板的变形。通过对比分析主从节点绑定的实心管板结构与开孔管板结构开孔区域应力分布,得到开孔边缘的应力集中系数为约3,开孔中部的应力集中系数约为2。
The equivalent method of heat exchanger tube plate affects the accuracy of stress calculation of the tube plate. Taking shell-tube heat exchanger as an example, the finite element model of the structure of the perforated tube plate, the solid tube plate structure with shared node and the solid tube plate structure with the master-slave nodes binding were established respectively and the stress and deformation of the tube plate were analyzed by numerical calculation. Finite element calculation results show that, the maximum relative error of deformation is 8.4% between the perforated tube plate and the solid tube plate structure with the master-slave nodes binding while the relative error of stress is over 60% and this means that the deformation of the tube plate could be accurately described by the master-slave nodes binding. Through comparative analysis of the solid tube plate structure with the master-slave nodes and the perforated tube plate stress distribution of the hole area, the hole edge＇ s stress concentration coefficient is about 3.0 and the stress concentration coefficient of central hole is about 2.0.
出处
《化工机械》
CAS
2017年第6期710-716,共7页
Chemical Engineering & Machinery
基金
国家自然科学基金青年基金(51604080)
中国石油和化学工业联合会科技指导计划项目(2016-01-01)
中国石油科技创新基金(2017D-5007-0610)
关键词
换热器
管板
数值计算
主从节点绑定
应力集中系数
heat exchanger, tube plate, numerical calculation, master-slave nodes binding, stress concentration coefficient
