|
In production of carbon, graphite is a high quality stuff for electrolytic aluminium anode, electrolytic aluminium cathodes, electrode paste and carburetant. Adding graphite is able to improve the quality of products self, primary aluminum and carbon steel, reduce consumption, lower consumption of production energy and so on, but it hasn’t been used widely, because of its limited quantity or high price.Therefore the thesis researches a technology of continuous graphitizing. It can produce high quality graphitized coke by petroleum coke or anthracite, at the same time output will be increased, heat loss will be reduced, and the price will decline to meet the demand. Based on analysis the problem of the existing production technology of graphitized coke, and study of electrical calciner and submerged arc furnace, the thesis poses the technique of continuous graphitizing and related theories, which is used to design continuous graphitizaion furnace for the experiment.The experimental production of graphitized coke and the related experiments are carrided out by using the furnace, in order to verify the feasibility of the design and find the system of power supply and the reasonable operating parameters for the furnace.Verified by the experiments, the continuous graphitization furnace for the experimental is able to achieve a continuous, adaptive production of high quality graphitized coke, while the lining material can use an ordinary refractory. The furnace has the following advantages:(1)Energy consumption is low. Because of continuous production, the elimination of regenerator loss of the furnace and insulation material and reduction of heat loss are expected. When calcined coke as stuff, the furnace energy consumption is about 2500kW·h/t, which is lower than the minimum value of Lengthwise graphitization(LWG) furnace.(2)Heating cycle is short. The furnace can discharge graphization coke ervery 10-30min, heating time last only 2-3h.(3)The products are graphitized uniformly. The stable high temperature zone ensures heating uniformly and higher degree of graphitization, and in conjunction with the reasonable structure to achieve high-temperature materials and low-temperature separation, that is expected to ensure that high quality products are discharge.In addition, the furnace feed and discharge easy, and is efficient, low labor intensity and less pollution. According to the experiments, the system of power supply and operating parameters for the furnace are drawn as follows:In its continuous and stable stage of production, the voltage is constant, while the current and the power are changed freely with the change of resistivity of the stuff. The value of current is the guidance of operation. According to different stuffs or different degrees of graphitization of products, there are different values of current for beginning discharging, and different ones for ending discharging.
|