Automatic control device of electrode deep insertion of submerged electric furnace

Abstract

The invention discloses an automatic control device of electrode deep insertion of a submerged electric furnace, comprising an electrode lifting mechanism for lifting the submerged electric furnace, a resistance survey meter for measuring the electrode deep insertion resistance of the submerged electric furnace and a controller, wherein the controller is respectively connected with the electrode lifting mechanism and the resistance survey meter to compare the resistance obtained by measurement of the resistance survey meter with a preset resistance so as to obtain a resistance difference, and the electrode lifting mechanism is controlled to lift the electrode according to the resistance difference only when the resistance difference exceeds to a preset resistance difference threshold valve and the duration time thereof exceeds preset duration time. The automatic control device of electrode deep insertion of the submerged electric furnace in the invention can effectively improve production stability of the submerged electric furnace, lower impact to grid, reduce electrode consumption, lessen electric consumption, improve production environment and lighten environment pollution.

Description

technical field [0001] The invention relates to auxiliary equipment of a submerged arc electric furnace, in particular to an automatic control device for electrode insertion depth of a submerged arc electric furnace. Background technique [0002] An electric arc furnace is an electric furnace that uses the thermal effect of an arc to melt metals and other materials. According to the heating method, it can be divided into three types: ① indirect heating electric arc furnace. The arc is generated between the two electrodes without contacting the material, and the material is heated by heat radiation. This kind of stove is noisy and has low efficiency, so it is gradually eliminated. ② Directly heat the electric arc furnace. The arc is generated between the electrode and the material, and the material is directly heated; the three-phase electric arc furnace for steelmaking is the most commonly used direct heating electric arc furnace. ③Submerged arc electric furnace, also kn...

AI Technical Summary

Problems solved by technology

However, manual lifting and lowering of the electrode is completely dependent on manual judgment, and the accuracy is poor. With the traditional PID closed-loop control, a slight change in the current will cause the electrode to rise and fall, thus causing the electrode to rise and fall frequently.

Therefore, the traditional electrode lifting is not suitable for the multi-parameter and large-lag production characteristics of the submerged arc electric furnace, which causes the electrode to move up and down frequently, and the overshoot is serious, making the production of the submerged arc electric furnace unstable, and arcing, broken electrodes, and current changes often occur Large, unbalanced current, large and low power factor changes, so there are defects such as large waste of electric energy, large impact on the power grid, high unit consumption of electrodes, smoke and dust caused by material turning or arc light, and serious environmental pollution.

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