A power density control method for smelting fused magnesium in an AC electric arc furnace
A technology of power density and control method, applied in the field of fused magnesium smelting, can solve the problems of loose fused lump structure, high energy consumption per ton, and many impurities, and achieve the effect of reducing energy consumption and increasing efficiency
Inactive Publication Date: 2017-09-19
营口东吉科技(集团)有限公司 +1
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Problems solved by technology
[0006] At present, various control strategies control the rise and fall of the electrode to control the constant current, which belongs to constant power control. Its disadvantage is that the power density injected into the molten pool changes. With the continuous expansion of the molten pool, the power density injected into the molten pool The continuous reduction leads to uneven heat received by the molten pool, and the formed molten lump has a loose internal structure, low density, many impurities, and high energy consumption per ton.
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[0043] Build a data acquisition and processing system on the original fused magnesium smelting platform, see figure 1 , figure 1The medium electric smelting magnesium smelting platform consists of a molten pool 18 , a furnace shell 17 , three graphite electrodes 16 , a conductive cross arm 15 and a water-cooled busbar 14 . The data acquisition and processing system consists of three-phase power meter 1, thermal imager 2A, 2B, image synthesizer 3, temperature field distribution finite element calculation module 4, molten pool volume integral calculation module 5, power density calculation module 6, and smelting stage timer Module 7, smelting decision processor 8, electrode position control module 9, silo valve control module 10, coarse and fine silo valves, ultrasonic silo feeding weight calculation module 13. Wherein, the thermal imager 2A and the thermal imager 2B are arranged oppositely along one diameter of the electric arc furnace, as figure 1 shown.
[0044] Wherein th...
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The invention relates to a power density control method for smelting fused magnesium in an AC electric arc furnace. The steps are as follows: (1) collecting two temperature distribution images on the surface of the furnace body through a thermal imager; (2) collecting two images through an image synthesizer. (3) Calculate the temperature field distribution inside the furnace by using finite element method; (4) Calculate the volume VT of the molten pool; (5) Calculate the power density based on the power and the volume of the molten pool (6) Calculate the weight of the ore input; (7) According to the power density calculated in step (5), combined with the state of the smelting stage and the weight of the feed bin, adjust the lifting height of the electrode and the opening and closing size of the valve through PID control, and then control power density. By changing the lifting height of the electrode and the opening and closing size of the valve, the power density can be controlled. The method can make up for the defects of the current control method for smelting fused magnesium in the AC electric arc furnace, and helps to reduce the energy consumption per ton of the electric arc furnace and increase the benefit.
Description
technical field [0001] The invention relates to the technical field of smelting fused magnesium, in particular to a power density control method for smelting fused magnesium using an AC electric arc furnace. Background technique [0002] Fused magnesia is an important refractory material used in the metallurgical industry, usually using natural high-quality magnesite (MgCO 3 ), brucite (Mg(OH) 2 ), light-burned magnesia and dead-burned magnesia as raw materials are melted in a three-phase electric arc furnace. my country's magnesite is rich in resources and fine in texture. It is one of the dominant minerals and occupies an important position in the world. The process in which magnesite is thermally decomposed in an electric arc furnace to generate fused magnesium is essentially that magnesium carbonate is thermally decomposed into magnesium oxide and di [0003] The process of oxidizing carbon gas, its specific reaction formula is as follows [0004] [0005] The MgO...
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IPC IPC(8): F27B3/28
Inventor 付友崔军崔俊峰王宁会
Owner 营口东吉科技(集团)有限公司