The Research About Process And Equipment Of Coal Prepare To Graphite In The Ultra High Temperature

In this article, a lot of information about the design of the high temperature furnace have been through access,determine the internal heating type ultra high temperature graphitization furnace using power, furnace type size and parameters such as power supply way according to the working principle of acheson sic smelting furnace, based on years of research work on the way of heat transfer in the furnace body and use characteristics are analyzed. On the shape and size of the furnace core adopts industrial acheson furnace surface load selection principle of selection; The selection of furnace insulation material and size based on the Fourier heat transfer law of multilayer wall review. Through the theoretical calculation and the simulation software Ansys is adopted to the working process of the furnace body, to simulate the temperature field on the basis of simulation parameters, designed and manufactured with internal ultra high temperature graphitization resistance furnace, and to come from the yunnan zhaotong region of ultrapure anthracite graphitization treatment. Design, manufacture and link design is demonstrated in that the internal heating type ultra high temperature graphitization stove has authenticity, reliability, practical and scientific. Furnace cost cheap, implementation is simpler, better economy. But the degree of furnace body integration, automation of water and higher temperature(above 3000 ℃) remains to be further raising the exploration and research.Respectively to put Yunnan zhaotong anthracite and shaanxi yulin coal ito high temperature heat treatment in 2000 ℃,, 2200 ℃, 2400 ℃, 2600 ℃, 2800 ℃ and 3000 ℃.Then test and characterize the chemical composition, resistivity, microstructure, phase composition and internal functional groups migration process was tested and characterization of these two kind of graphite coal.Based on comparative analysis, it is concluded that moisture, ash content and volatile in the coal is gradually decreasing along with ascension of heat treatment temperature. the higher the temperature, phase transformation, the more quickly and completely. the rest is mainly the carbon atoms in 3000 ℃.The process of heattreatment could shift the coal from a kind of approximate insulation phase to conductive phase. the higher the temperature, the better the conductive effect of phase transform.In3000 ℃, resistivity of yunnan zhaotong graphitization anthracite is minimum which is0.02255 Ω. m.It is close to the resistivity of graphite that is 0.020Ω. m.In the same temperature, resistivity of the shaanxi yulin graphitization bituminous is ten times more resistivity of graphite.The crystallinity and the diffraction peak strength of graphitization coal are increasing. when the heat treatment temperature is 3000 ℃, crystal plane(002)diffraction peak got rapidly ascent in anthracite and bituminous coal.The crystal plane diffraction curve of graphitization anthracite is approximate to graphite’s. it is 93% that the crystallinity of Yunnan zhaotong graphitization anthracite is. it is 63% that the crystallinity of Shaanxi yulin graphitization bituminous coal is.It is show that the higher the heat treatment temperature, the more completely fixed carbon transition from amorphous to crystalline, the more the single of phase.We observe that morphology of these two kind of coal in the each high temperature heat treatment. It is found that graphitization anthracite coal generate tiny microcrystalline particles in 2000 ℃.with the temperature rising, the microcrystalline creep and grow up to the columnar structure. It turn into flake structure in 2800 ℃. It eventually grow up to graphitization lamellar structure in 3000 ℃.But Shaanxi yulin graphitization bituminous coal generate tiny particle in 2400 ℃.These microcrystalline creep into columnar structure in2800 ℃.But, in the 3000 ℃,it still not to turn into a lamellar structure.