Finite Element Intensity Analysis Of Heat Exchanger With Coupling Of Closure Plate And Tube Plate

Shell and tube heat exchanger is an implementation of energy-efficient heat transfer between materials processing equipment, it can substantially reduce energy, improve energy efficiency. It is widely used in chemical, petroleum, power, light industry, medicine, metallurgy, shipbuilding, aviation, refrigeration, heating and other industrial sectors. Now, thanks to more modern industrial production technology, all kinds of production in order to meet the practical requirements in special circumstances, the project is often non-standard shell and tube heat exchanger, my study model is also a non-standard design, so can not use ordinary design. So this paper, use ANSYS finite element method to analyze the stress structure on coupling of closure plate and tube plate, study temperature field and stress intensity under different conditions on coupling of closure plate and tube plate, and to check eligibility.This paper analyzes the following aspects of the heat exchanger, the main contents and conclusions are as follows:(1)According to the structural characteristics of the model, the mathematical model of the force of bolts are simplified, only consider the uniform force of bolts and the ratio of the pressure of washer. Using ANSYS finite element software program designed a suitable finite element model for non-standard coupling of closure plate and tube plate, take the model of 1/4 to analyze, obtain distribution of the temperature field by the model temperature field.(2)Under the temperature field, use the indirect method to analyze thermal stress of model. Because of the different thermal expansion coefficient of different kinds of materials, appears stress intensity value of the mutation where they are connected. PCG solver is used to solve the thermal stress model, to find out the maximum thermal stress intensity. Select the maximum stress point on the dangerous section as a path, line the path and calculate the corresponding thermal stress intensity and check strength.(3) Heat exchanger is also subjected to mechanical stress, therefore I have analyzed the stress of coupling of closure plate and tube plate under the pressure of the shell and tube side, and evaluation the effect of them when under the stress of mechanical loading.(4) The complexity of heat stress, so also analyze the stress of coupling of closure plate and tube plate when under the temperature load, the shell pressure and tube pressure, and evaluation the effect of them when under the stress of mechanical loading and temperature loading. Then assess security of heat exchanger according to JB4732-95《steel pressure vessel- analysis and design standards》(5) Through the analysis of the three conditions, found that the original design of heat exchanger failure strength check for the condition two and three where the conditions at the closure plate chamfered, improved its original design by increasing the radius of hole, then it reaches the strength standards.