Optimum Design Of Heat Exchanger For Oil Free Air Compressor Based On Thermal Field Analysis

Heat exchanger is a kind of equipment that can transfer heat between two or more fluids of different temperatures.It ensures equipment operate normally.Heat exchanger plays an important role in food,chemical,petroleum,and so on.Due to the limitation of basic materials,fracture and leakage often occur in heat exchanger under high temperature and high pressure conditions.Combined with previous cooler design experience and CFD numerical analysis,the numerical simulation and experimental two aspects of the in-depth discussion and research,designs a stainless-steel pre-cooler at the front of the original cooler to relieve the pressure of heat exchanger.The detail research contents are as follows:Firstly,Summarize the data of the current heat exchanger operation and extract the key parameters,discuss and determine the damage position and root cause of the equipment.The discussion shows that the damaged positions all occur in the brazing positions,and the current materials cannot meet the operating condition of the equipment at 254?.Secondly,after checking the design parameters of the heat exchanger,a one-to-one 3D geometric model was established to analyze the temperature field and thermal stress,and find the location of maximum stress concentration.Meanwhile,numerical analysis was repeated by modifying the parameters and structure.Through the analysis of temperature field and thermal stress,it is shown that the design of the pre-heat exchanger structure in front of aluminum heat exchanger can greatly relieve the pressure of the aluminum heat exchanger in this working condition and meet the requirements of the equipment.Thirdly,3D model of the whole unit is used for the analysis of the flow field of the cooling air duct,the stress analysis of the relevant auxiliary components,and the simulation analysis of the whole machine's transportation condition.After simulation analysis and optimization,all the relevant stresses meet the requirement.Fourthly,heat exchanger was tested from an experimental point of view,a prototype was made,and assembled on an existing machine.After collecting test data,and compared with the standard unit.The experimental results show that the performance is up to the same standard as the standard unit and meets the current operating conditions.