发夹式换热器异形法兰及封头的设计

发夹式换热器后端壳程连接处常采用异形法兰和封头的结构,标准中并未列出相关结构设计和计算方法,给设计带来很多困难。文中结合一台壳程压力7.3 MPa并伴有温度疲劳载荷作用的发夹式换热器,首先对其异形法兰和封头进行结构优化设计,再利用规则设计方法确定结构的初步尺寸,最终按GB/T 151—2014确定计算工况后进行有限元应力校核。结果表明,规则设计方法计算出的结构应力偏低;尤其对异形封头,因异形法兰对其影响,其结构尺寸必须通过有限元分析进行校核。

Design of Special shaped Flange and Head in Hairpin type Heat Exchangers

Special-shaped flange and head are often used in the rear closure of hairpin-type heat exchangers,the design and calculation methods are not listed in the standard,which brings many difficulties to the design.Combined with a hairpin-type heat exchanger accompanied by temperature fatigue load and 7.3 MPa shell design pressure,structual optimization was done.Firstly,the structure optimization design of its special-shaped flange and head was carried out,and the preliminary size of the structure was determined by using the regular design method.Finally,the finite element stress was checked after the calculation condition was determined according to GB/T 151—2014.The results shows that structure stress level of the rule design method is low,especially for special-shaped head,because of the influence of special-shaped flange,its structure size must be checked by finite element analysis.