3-D Finite Element Analysis Of Tubular Heat Exchanger

By applying ANSYS, three 3-D finite element models are constructed inthis thesis: thermal model, entire model of heat exchanger and vesselmodel with large hole. The thermal model gains the distribution oftemperature by the heat transfer analysis of model under high temperatureload and accordingly calculates thermal-stress. After full-considering thestructural complexity of the tubular heat exchanger and node's consistencywith the thermal model, the entire model provides a steady base forstructural analysis by using solid element, beam element and shell element.These kinds of element can effectively reduce scale of finite element model.The calculation result of the entire model is base of stress analysis andsecurity assess of heat exchanger. After discussed the temperature load andpressure load influence to tubular heat exchanger respectively, the mostrisky case is affirmed. Based on the JB4732-95<>, strength check of heat exchanger is carried out .The stress analysis of the vessel model with large hole not only verifies thesecurity near the hole, but also shows that the simplifications for the entiremodel are reasonable.The analytical results of stresses for the tubular heat exchanger andtubesheet in this study are consistent with the information from relatedreferences and standards. Some results for the analysis about thermalanalysis and the stress distribution are also in accord with some classicaltheories. It shows that the finite element models constructed in this study ii北京化工大学硕士学位论文are reasonable. Moreover, the stress analysis by comparing not only gainsthe stress distribution but also finds out the different influence of differentload cases on the stress distribution. These conclusions drawn from in thisthesis could be used as a reference for structural design and optimization ofthe tubular heat exchanger.