A control method for automatic pressing and releasing of self-baking electrodes of submerged arc furnace

Abstract

The invention discloses an automatic pressure release control method of a self baking electrode of a submerged arc furnace. According to the method, after every pressure release action of each phase of self baking electrode is accomplished, an effective active power calculated value, a current heat effect calculated value and an accomplished pressure release time interval calculated value injected to the phase of self baking electrode are calculated again and are continuously monitored, and the three calculated values are compared with respective corresponding set values. When arbitrary two calculated values in the three calculated values exceed the respective corresponding set values, a pressure release control operation of the phase of self baking electrode is automatically started. By adoption of the method disclosed by the invention, full automatic control of the pressure release of the self baking electrode can be realized, the pressure release operation of the electrode of the submerged arc furnace is regulated, the probability of soft electrode breakage and hard electrode breakage accidents caused by improper frequency and opportunity of the pressure release of the electrode due to manual operation is reduced, the furnace halt time is shortened, the smooth operation of the submerged arc furnace is facilitated, and the labor intensity of workers and the production cost are reduced.

Description

technical field [0001] The invention relates to the technical field of submerged arc furnace automation, in particular to a method for automatically pressing and releasing self-baking electrodes of submerged arc furnaces. Background technique [0002] The submerged arc furnace is a special electric arc furnace with a wide range of uses and can produce a variety of products. It is mainly used for the reduction smelting reaction of metal oxide ores. Because the arc is usually buried deep in the charge, the submerged arc furnace is also Known as submerged arc furnace. In the submerged arc furnace, the low-voltage and high-current electric energy provided by the power supply system is input into the furnace through the furnace transformer, the secondary short network, and the three-phase self-baking electrode, and the arc generated at the end of the electrode converts the electric energy into heat energy, thereby A high-temperature reaction zone is formed in the furnace body, a...

AI Technical Summary

Problems solved by technology

However, since there are many factors that affect the pressing and releasing timing of self-baking electrodes, such as electrode current, power, power factor, material surface temperature, branch current and electrode paste composition, etc., changes in various factors will affect the pressing and releasing timing of self-baking electrodes, and There is no law to follow in the change of some factors

Therefore, various submerged arc furnace smelting enterprises often frequently have production accidents of soft or hard breakage of self-baked electrodes due to improper timing of self-baked electrodes.

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