Finite Element Research Of U-Tube Heat Exchanger With Self-Tight Seal

Shell and tube heat exchangers are typical process equipments in petrochemical industries, Shell and tube heat exchangers bear complex stress. Analyzing stress correctly performs is an important role in assuring the economy of heat exchanger and saving the material while keeping sufficient strength of the tubesheet.It is difficult to find out an engineering example that plain cushion self-tight seal applied to tubesheet seal in domestic and overseas references. At the same time, there is nobody to do the finite element analysis of U-tube heat exchanger with self-tight seal. Basing on the opportunity, this paper researches U-tube heat exchanger with self-tight seal.The paper introduces several common structure types of shell and tube heat exchanger and seal types of tubesheet for U-tube heat exchanger. It can't adopt traditional method to design and calculate self-tight seal tubesheet of U-tube heat exchanger. So this paper uses finite element numerical analysis method to research temperature field and stress field of U-tube heat exchanger with self-tight seal.There are not much calculation methods about plain cushion self-tight seal in the common seal structures'. Therefore, the article does the related theoretical calculation of plain cushion self-tight seal and through finite element analysis of the model verifies the correct of the sealing calculation formula.In the part of U-tube heat exchanger with self-tight seal temperature field analysis, it introduces the production of thermal stress and analysis method of temperature field. First do these correctly: model building, mesh generation and loading of the temperature field. Then get the solution to temperature field. Finally, analyzing path results and summing up rules.The paper also researches the stress distribution condition. Tubesheet stresses of seven operation cases are analyzed and evaluated. The stress intensity of tubesheet is eligible. At the same time it researches total stresses and membrane stresses of seven paths in tubesheet. Through stress analysis of tubesheet, we can find out the most dangerous operating case and position, the position located tubesheet convex platform joints and u-shaped tube bend pipe place. Then it can provide reference for U-tube heat exchanger with self-tight design.Furthermore, the paper still compared the overall modeling and local modeling of tube sheet stress analysis. Studies stress changes of tubesheet which modeling is changed, and the stress changes of inner and outer wall of heat exchanger tube, and axial stresses changers of which.The paper studies U-tube heat exchanger with self-tight seal of from many aspects and angles, analyzes and sums up mechanics characteristic of this tubesheet. And it also provides a mass of analysis results which has certain value for this kind of heat exchanger.