The Research Of The Structure Of Furnace For Pyrolysising The Waste Tire And Numerical Simulation Of The Temperature

With the rapid development of automobile industry,the number of used tires is increasing and the waste tires placed at random gradually become a new "black pollution".It has become an urgent problem to be solved by governments all over the world that how to deal with the waste tires safely and environmentally friendly.Pyrolysis is an efficient and environmentally treatment among all kinds of methods to deal with the waste tires,moreover,it has much room for development.Thermal cracking furnace is the key part of thermal cracking equipment.The pyrolysis disk in the pyrolyzer is the core part of the thermal cracking process of waste tires.The surface temperature distribution has a great influence on the formation and quality of the pyrolysis products.The materiel is drove to make spiral movement by the rakes of the surface pyrolysis disk and the material ring is produced.The different structure of rake can make the material to form different shape and height of the material ring and will affect the process of heat transfer at the same time.The main research contents of this paper are thermal cracking equipment structure,rake,numerical simulation of the pyrolysis disk.Concrete from the following several aspects of research and analysis:In this paper,considering the factors such as the reaction temperature,the variety,the sealing property and the thermal insulation property of the thermal cracking equipment,the thermal cracking furnace structure of several continuous production and intermittent production was designed.At the same time,compare the advantages and disadvantages of various equipment,choose a better equipment,the simulation study.Secondly,because during the process that the scrap tire small pieces are drove to do spiral movement in the pyrolysis disk by rakes with different shape structure,the material rings with different height distributions will be produced.Length,width,height and installation parameters of the rake leaf need to satisfy certain conditions in order to guarantee normal mass transfer and heat transfer activity of the scrap tire small pieces in the pyrolysis disk.A rake structure was designed.The rake structure will make the section of the material rings of the scrap tire small pieces to be isosceles trapezoid,which greatly increased the effective heat transfer area,enhanced the effect of material mixing and improved the heat transfer efficiency.Rake leaves in a hot tearing Jiepan promote wastetire small spiral movement and the rake leaves with different shapes and structures will make the ring height distribution different.The lastly,numerical simulations of two kinds of hollow heat scheme of vertical thermal cracking furnace structure for the continuous production of pyrolysis disk were carried out.The two schemes of the pyrolysis disk internal high temperature flue gas temperature distribution and surface temperature distribution were compared.The simulation results show that the surface temperature of the two kinds of structures was all satisfied with the needs of minimum temperature of the minimum complete thermal cracking.Because the flow dead zone was easily produced,the temperature distribution of the surface is not uniform in the second kind of structure.It will have a negative impact on thermal cracking,and even affect the quality of the pyrolysis products.After comprehensive comparison of the structure of the two kinds of the pyrolysis disk,the first scheme of the pyrolysis disk is relatively ideal in structure.The surface temperature distribution is uniform,and can meet the requirements of thermal cracking temperature.Therefore,the numerical simulation study on the temperature distribution of the pyrolysis disk laid the foundation for optimization of the thermal cracking furnace structure and the parameters of the thermal cracking process.