大型NEN型立式换热器计算要点分析  

ON CALCULATION POINTS OF LARGE NEN VERTICAL HEAT EXCHANGER

作　　者：吴冬梅[1] 杨素春[1] 张俊 顾江伟 杜涛 张文立[1] Wu Dongmei;Yang Suchun;Zhang Jun;Gu Jiangwei;Du Tao;Zhang Wenli(Beijing Petrochemical Engineering Co.,Ltd.,Beijing,100107)

机构地区：[1]北京石油化工工程有限公司,北京100107

出　　处：《石油化工设备技术》2023年第1期27-30,I0002,共5页Petrochemical Equipment Technology

摘　　要：目前大型NEN型立式换热器广泛应用于各生产装置,文章结合此类换热器计算方面的发展情况,阐述了几个计算要点:首先计算载荷问题,应考虑重力、压降等换热器标准中易忽略的载荷;其次总结了几种处理此类设备的Ansys有限元模型,包括实体模型、多点约束(MPC)法模型、管板简化为当量实心板等简化模型;最后论述了各种模型的应用场合。基于目前JB/T 4732标准中针对壳体与管板连接处分析评定保守的问题,除了考虑ASME中简化弹塑性方法和一次结构法外,建议采用塑性极限载荷法,分析时还可结合子模型结构以提高效率。最后以1台NEN型反应器为例,对计算结果进行了总结。Currently large NEN vertical heat exchangers are widely used in process units. This paper expounds several calculation points based on the development of the calculation of such heat exchangers. Firstly, loads that are easily ignored in heat exchanger standards such as weight load and pressure drop should be considered;secondly, several Ansys finite element models dealing with such devices are summarized, including solid models, multi-point constraint (MPC) method models, and simplified models such as tube plates simplified to equivalent solid plates;finally, the application of various models are discussed. Based on the conservative analysis and evaluation of the connection between the shell and the tube plate in the current JB/T 4732 standard, the plastic limit load method is recommended in addition to the simplified elastic-plastic method and the primary structure method in ASME, and sub-model structure can be combined with the analysis to improve efficiency. Finally, the calculation results are summarized with one NEN reactor as an example.

关 键 词：NEN型立式换热器 计算载荷 有限元模型 塑性极限载荷法 子模型 

分 类 号：TQ051.5[化学工程]