Ladle refining furnace electrode adjusting system

Abstract

The invention discloses a ladle refining furnace electrode adjusting system, belongs to the technical field of electric furnace control, and particularly relates to an adjusting control system with a three-phase electrode stand column capable of ascending and descending independently and automatically, and a hardware part of the ladle refining furnace electrode adjusting system comprises a rotating base frame, a base, a lifting device, a station adjusting device, a cross arm and a clamping device. The lifting device adopts an independent scheme and can realize free lifting of each electrode stand column, and the station adjusting device can realize integral rotation of the electrode stand columns so as to realize uninterrupted continuous heating of a plurality of steel ladles; the software part of the arc furnace electrode adjusting system adopts an impedance control strategy, and the electrode state can be automatically adjusted according to the optimal working point pre-selected by the power circle diagram. Compared with the prior art, the energy consumption can be remarkably reduced, the production efficiency is improved, and the interference of the electric furnace to a power grid is reduced.

Description

technical field [0001] The invention belongs to the technical field of electric furnace control, and in particular relates to an electrode adjustment system of a ladle refining furnace. Background technique [0002] Ladle refining furnace is the main refining equipment outside the furnace in steel production. Due to its simple equipment, low investment cost, flexible operation and good refining effect, it has become a rising star in the metallurgical industry and has been widely used and developed at home and abroad. The ladle refining furnace mainly relies on the white slag in the barrel. In a low-oxygen atmosphere (oxygen content is 5%), argon is blown into the barrel for stirring, and the molten steel passing through the primary furnace is heated by graphite electrodes to refine. Since the argon gas stirring accelerates the chemical reaction between slag and steel, using arc heating for temperature compensation can ensure a longer refining time, thereby reducing the oxyge...

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Problems solved by technology

[0004] 1) During the operation of the refining furnace, the height of the electrodes needs to be adjusted frequently. The three-phase electrodes of the existing part of the refining furnace structure cannot be adjusted independently. Even if the three-phase electrodes of some refining furnace structures can be adjusted independently, their verticality and strength are low , it is prone to shaking during use;

[0005] 2) In the process of heating the ladle, the refining furnace generally adopts the structure of "one furnace and one ladle". When the ladle is in the process of transportation, fixing, installation, etc., the refining furnace can only start heating when the ladle is ready, which wastes a lot of energy. operating hours;

[0006] 3) At present, mature refining furnace electrode regulators include constant impedance regulators, constant power regulators, three-phase power balance regulators, constant arc length regulators, etc., and mainstream electrode regulation control algorithms include arc current method and impedance method. Type: the former takes keeping the secondary current of the furnace constant as the control target, and the latter takes keeping the secondary load impedance of the furnace constant as the control target. However, the above-mentioned electrode regulators generally work according to the static impedance setting value, but in actual production Among them, the optimal operating point of the circuit has many relationships with the actual state of the circuit. The electrode regulator only using the static design point cannot actually meet the needs of the optimal operation of the power circuit.

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