| As a kind of heat exchanger,shell and tube heat exchanger is widely used in petrochemical industry,and it is also the most widely used one in oil refining and chemical industry.In recent years,with the continuous development of oil refining and chemical industry,shell and tube heat exchanger is also becoming larger and larger,and its diameter of tube plate and the thickness of corresponding structure are also increasing,which makes the design of shell and tube heat exchanger more difficult.Therefore,in view of the existing problems,this paper puts forward a kind of combined tube sheet fan-shaped annular heat exchanger structure,establishes the combined tube sheet model by using the finite element method,analyzes the stress,deformation and fluid structure coupling of the tube sheet of the heat exchanger,and optimizes the design of the fan-shaped tube sheet.The research content of this paper has important reference value for the design of combined fan-shaped annular tube sheet.The main contents of this paper are as follows:(1)This paper analyzes the structure of the existing fan-shaped annular tube sheet heat exchanger,puts forward the design idea of replacing the whole tube sheet with the segmented fan-shaped annular tube sheet,and reduces the thickness and production difficulty of the tube sheet by reducing the equivalent size of the tube sheet.This paper introduces the model structure of combined fan-ring tube sheet heat exchanger,and determines the specific size scheme and parameter conditions,which provides reliable technical support for the production,application and subsequent development of the product.(2)In this paper,the finite element analysis method is used to simulate the stress concentration caused by the opening of different sizes of fan-shaped annular tube sheet with ANSYS software,and the stress distribution of the ring-shaped tube sheet is compared with that of the ring-shaped tube sheet without opening.The relationship between the stress concentration coefficient and the geometric size of the ring-shaped tube sheet is obtained.(3)ANSYS software is used to analyze the deformation of different sizes of fan-shaped annular tube sheet.The results show that the maximum deformation is in the central area far away from the boundary support of the fan-shaped annular tube sheet.The deformation of the fan-shaped annular tube sheet is significantly less than that of the fan-shaped annular tube sheet without opening,and the opening has a significant weakening effect on the deformation of the tube sheet.(4)The fluid structure coupling numerical simulation of the tube sheet and tube sheet of the fan-ring tube sheet heat exchanger is carried out by FLUENT software.The temperature field,pressure field and fluid velocity distribution at the tube sheet and tube sheet are calculated.The stress intensity of the tube sheet and tube sheet under the operation condition is calculated.The stress linearization analysis method is adopted according to JB4732 steel pressure vessel-Analysis and design standard The strength is checked in the standard.(5)The thickness of the fan-shaped annular tube sheet is optimized.With the increase of the tube sheet thickness,the temperature difference between the inside and outside of the tube sheet increases,the maximum temperature of the tube sheet side increases,and the minimum temperature of the shell side increases accordingly.The temperature difference stress decreases first and then increases with the increase of the tube sheet thickness,and the peak stress of the optimized tube sheet decreases obviously.The optimal thickness of tube sheet is 47.5mm according to the results of tube sheet optimization analysis under the condition of constant boundary conditions. |
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