| In this thesis, a four-tube side heat exchanger with the 3-layerΩexpansion joint is studied by the fnite element analysis in using ANSYS software.In this thesis, research works are done as follows. First of all, the monolayerΩexpansion joint is compared with the 3-layerΩexpansion joint in strength and stiffness. The equivalent stiffness of monolayerΩexpansion joint is used in the whole heat exchanger.Secondly, geometric model and finite element analysis model of the whole heat exchanger with monolayerΩexpansion joint are built, it is based on the dimensions and processing of the equipment and consideration of its complexity.Thirdly, temperature field and thermal stress of the heat exchanger are calculated by using the heat transfer calculations which are handled with the shell and tube of the heat exchanger.Fouthly, geometric model and finite element analysis model of the heat exchanger with the improved strength mode of the expansion joint are built. Once more, temperature field and thermal stress of the heat exchanger are calculated.Finaly, the strength of the heat exchanger is analyzed by the finite element model under various of combined loads from pressure in the tube, shell and temperature changing, and then stress intensity under the various of cases and location are obtained. Then according to the JB4732—1995《Steel pressure vessels—Design by analysis》, stresses in results of finite element analysis are assessed.The analysis results show that the whole model and its elements of the heat exchanger meet the strength requirement by using new strength mode of the expansion joint. So the new mode is feasible, the design of the equipment is safe.This analysis results can be used as useful reference data to optimized design in the complex heat exchanger.
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