固定管板换热器N型管箱应力评定方法  

Stress Assessment Method for N Type Channel of Fixed Tubesheet Type Heat Exchanger

作　　者：孙志刚 杨湖 SUN Zhi-gang;YANG Hu(Wuxi Chemical Equipment Co. ,Ltd. ,Wuxi 214131,China)

机构地区：[1]无锡化工装备股份有限公司,江苏无锡214131

出　　处：《压力容器》2018年第11期47-52,共6页Pressure Vessel Technology

摘　　要：当固定管板换热器采用N型管箱结构时,采用SW6. 0中的JB 4732算法可以计算校核筒体或管箱端部的总应力,但有时会出现压力载荷单独作用下筒体或管箱端部的总应力校核不通过的情况,导致筒体或管箱端部厚度比按照GB/T 151设计的更厚。根据一次结构法原理分析表明JB 4732算法存在着保守性,为此介绍了一次结构法和ASME管板设计方法,发现ASME管板设计方法与一次结构法是一致的,由ASME管板设计方法可以得到3种管板一次结构,而JB 4732算法采用的只是第1种一次结构。将这3种管板一次结构用在某换热器的有限元分析设计中,得到了不同的评价结果,选择其中最经济的设计方案,避免了筒体或管箱端部保守的设计。可为换热器结构优化设计提供一定的参考。While N type channel was adopted for fixed tubesheet type heat exchanger,the JB4732method in SW6.0can be used to check the total stresses in the shell and/or channel end,but sometimes the total stresses in the shell and/or channel end fail to pass stress check under action of only pressure load,resulting in the thickness of the shell and/or channel end being bigger than the thickness designed as per GB/T151.According to the analysis by the primary structure method,it was shown that JB4732method was conservative,therefore,the primary structure method and UHX method in ASMEⅧ-1were introduced.It was found that ASME method and the primary structure method were consistent,and3primary structures of the tubesheet can be obtained from ASME method,whereas only the first method was adopted in JB4732method.By applying the3primary structures of the tubesheet in analysis design of a heat exchanger by finite element method,different assessment results were obtained,and the most economical design case was chosen,which avoids the conservative design for the shell and channel end.The study in this paper can provide some references for the best design of heat exchanger structure.

关 键 词：N型管箱 应力分类 一次结构法 ASME方法 有限元分析 

分 类 号：TH49[机械工程—机械制造及自动化] TE965[石油与天然气工程—石油机械设备]