The Selection And Control Of Heating System In The Process Of High-temperature Prebaking Of Aluminum Reduction Cell

Facing the time of opportunities and competitions existing in aluminium electrolyze industry, the economic effects will become the constant subject noticed by the enterprises. With the electrolyze processes becoming more and more maturity and the economic parameters also becoming more approach (the same class technology and the equipment),the parameter difference of the aluminium reduction cell become much small such as the electricity consumptions, the current efficiency ,the alumina consumptions, consumptions of the carbon anode and the fluoride melts consumptions . But the cells' life still has the many differences, at the same time, the issue can be effect the aluminum production cost, which is the industry main equipment. In another words, the competitions of the industry lie in the cells' life.In light of the study, we think the factors effect, the cell's life have the five factors, include of the cells devise, the materials for cells installation, the quality of the install cells and the production managements of the aluminium electrolysis. In this paper, the author thinks the bottle- neck factor effect the cells' life is bake technology. The paper discusses the common bake technology, such as the metal bake, coke bake and the fume bake method. Just on the base of the relevant fields study in our nation and other country, the paper expound the high temperature fume bake method.In order to confirm the technology the carrying out, the temperature system's choice in the high temperature fume bake, which is this paper's emphasis. This paper provide the theory evidence for raising the temperature system of the cell , in terms of variety coming from the conduction math model element, and the paper also believe the 72h gradual increase the temperature system is justified , which behave in the bake results and the economic effects.In order to apply the technology fully, the paper develop the high temperature fume bake system, which be comprised of the burn facilities and control system. The research is also emphasis, focusing on the made up principle, hardware, the calculating methodology and the software is this paper's emphases. The main object to control is the temperature distribution of the coke baked cathode and the air superfluity coefficient in the fume. The paper realize the high temperature fume bake through PLC, PID numerical calculation, relying on the raising temperature system and controlling effectively proportion coefficient between the air and the oil on line.The high temperature fume bake developed from PLC and the PID numerical calculation already is used successfully on the 75 kA of the Shan xi Guan Aluminum Group Lt. d, and received the good results.