Thermal-structure Coupling Effect Analysis And Structural Optimization Design Of A New Type High Temperature Carbonization Furnace

With the rapid development of the times and the rapid progress of society,carbon fiber is used more and more widely.High temperature carbonization furnace is the main equipment for producing carbon fiber which is used for high temperature carbonization of carbon fiber.According to the performance requirements of carbon fiber,it can work at 2000 degrees centigrade.At the same time,the high-end heat resistant graphite hard felt used in the heat insulating layer of the high temperature carbonization furnace is produced by foreign enterprises at present,and the procurement is limited and expensive.Therefore,to reduce the usage of graphite felt hard in high temperature carbonization furnace,for the purpose of reducing the manufacturing cost of the carbide furnace.It is necessary to study the heat insulation structure of high temperature carbonization furnace and to optimize the thickness of graphite felt.In view of the research status of high temperature multilayer insulation structure at home and abroad,based on the comprehensive analysis,the thermal insulation structure of high temperature carbonization furnace is studied in this paper.In order to reduce the heat loss of the heat insulation structure,with the use of the performance of graphite felt with high temperature resistant and heat insulating coating with low thermal conductivity,the two are used together.The structure is still a multi-layer flat wall structure.The preliminary design scheme is given,according to the design parameters and boundary conditions of high temperature carbonization furnace's operating conditions and materials properties,using the optimal design plan and MATLAB,the thickness of graphite felt meeting the requirement is calculated according to the calculation result,using Solid Works software to design three-dimensional model of insulation structure.The heat transfer analysis model of heat insulation structure is established by using the finite element method and theory.3 temperature characteristic nodes and 2 displacement characteristic nodes are set up to verify whether the simulation analysis results can meet the design requirements.Thermal-Structure coupling simulation analysis of the high temperature carbonization furnace during the temperature rising phase and heat preservation phase was carried out by using the ANSYS finite element analysis software,and the temperature and displacement nephogram of different phases of heat insulation structure and the temperature curve along the thickness direction are obtained.It can be seen that the thermal insulation coating plays a major role in the whole temperature drop.Through the curve of temperature characteristic,node temperature changing with time,it can be seen that the temperature of the 3 nodes accord with the temperature boundary condition;by changing the curve of displacement characteristic point with time,it can be concluded that the displacement of the 2 nodes conform to the displacement boundary condition,and the correctness of the optimization results of the heat insulation structure and the stability of the structure are verified.