The Analysis Of Flow And Heat Transfer In Plate Heat Exchanger And Structure Optimization

As a kind of industrial equipment general plate heat exchanger, has been widely used in many industrial fields of chemistry, chemical industry, petroleum chemical industry, food, pharmaceutical etc.. Plate heat exchanger has high heat transfer coefficient, compact structure, easy unpick and wash etc.. However, the shape of runner plate heat exchanger is complex, stacked in a variety of ways, for a long time, the research only stay in the experiment and the basis of experience, lack of foresight; secondly, the heat exchanger’s scope of work and life directly affects the heat exchanger plate, beam and the bolt strength.Using numerical analysis method to study plate heat exchanger and the heat transfer characteristics inside, is an effective way to save the cost, convenient and time-saving. Secondly, the frame structure is an important part of the plate type heat exchanger, its stress is complex, testing the structural strength checking framework is essential for plate heat exchanger.This paper takes a plate heat exchanger DN32 series as the research object, by using the numerical analysis software FLUENT and structural analysis software ANSYS to analyze the flow and heat transfer analysis and frame structure of plate heat exchanger, and under the Isight platform has integrated UG and ANSYS optimized design of frame. The main research contents of this paper are:(1) The mechanism of fluid flow and heat transfer of the plate heat exchanger based on UG, through the construction of plate heat exchanger and the double channel model, and carries on the grid division, taking Fluent as the platform, select the standard k- turbulence model and SIMPLE algorithm to simulate the thermal analysis of double channel, the hot and cold double channel temperature field, pressure field distribution and the distribution of velocity field, and on the analysis of heat transfer performance of the heat exchanger. At the same time, the numerical results are compared with the actual situation, to verify the accuracy of calculation. In addition, this paper also studied the effects of different flow velocity on the heat exchanger heat transfer and pressure drop of the flow channel, which provides a reference for the research and development of new plate.(2) The effect of bolt pre tightening force and the fluid force on the frame structure, the plate heat exchanger is analyzed by finite element analysis, analysis of stress distribution of the whole structure and components of deformation and equivalent, obtains the universal law of plate heat exchanger by force, provides the reference for the development and optimal design of plate heat exchanger.(3) In order to improve the heat exchanger structure is obtained, based on the finite element analysis combined with multidisciplinary integrated optimization platform Isight optimization design of the frame structure. Through a series of command stream file and batch files automatically driven model assembly, mesh, finite element analysis and display of results, and combined with NLPQL gradient optimization algorithm to get the optimal solution of the frame structure, in order to meet performance constraints and size constraints. Optimal design of the frame structure with high significance of the.