摘要
采用有限元方法对管壳式多管程固定管板换热器在3种工况下,不同温度分布的换热管和管板的拉脱力进行了分析计算。结果表明,在多管程换热器的管束中,不同位置的换热管拉脱力存在较大的差别。对照ASME规范规定的许用值,工况3中所有换热管与管板接头的拉脱力均能满足要求,而工况1和工况2中分别有56根和22根换热管与管板接头的拉脱力超过了许用值。这些接头在介质的流动中出现振动、腐蚀等情况时,易发生破裂和泄漏。
Using the finite element method to shell-and-tube multiple fixed-tube plate heat exchanger in three kinds of cases, the pull-out force for a heat exchanger and tube-sheets under the different temperature distribution are calculated. The results show that the pull-out force have a bigger difference in the different locations of a heat exchanger tube for multiple exchangers. According to the allowable value of ASME, the pull-out force of all heat exchanger tubes and tube-sheet joint for case 3 can meet the requirements, but the pull-out force of the joints with 56 heat exchanger tubes and tube-sheets for case 1 and with 22 heat exchanger tubes and tube-sheets for case 2 are over the allowable values. Therefore, under the co-action of vibration, corrosion and so on caused by the flow of the medium, it is easy for these joints to rupture and leak.
出处
《核动力工程》
EI
CAS
CSCD
北大核心
2008年第6期58-61,共4页
Nuclear Power Engineering
基金
国家863项目(2007AA04Z430)
国家“十一五”支撑项目资助(2006BAK02B02)
关键词
换热器
拉脱力
管单元
有限元计算
Heat exchanger, Pull-out force, Tube element, Finite element analysis
