Automatic control device of rotation type electric smelting magnesium furnace and electrode current control method

Abstract

The invention discloses an automatic control device of a rotation type electric smelting magnesium furnace and an electrode current control method, and belongs to the technical field of electric smelting magnesium furnace process control. The device comprises a PLC (Programmable Logic Controller), an electric vibrator, a converter motor, a converter rotating and positioning limiting switch, a converter frequency changer, an electrode motor, an electrode frequency changer, a D / A conversion module, a weighing sensor, an electrode voltage and current signal collecting module an A / D conversion module and an upper computer monitoring system. The method comprises the steps that the three-phase current and the three-phase voltage flowing through a three-phase electrode of the electric smelting magnesium furnace are collected and converted into standard analog quantity current signals; the standard analog quantity current signals are converted into corresponding digital signals to be output to the PLC; and the current control over the electrode of the rotation type electric smelting magnesium furnace is finished in the PLC. According to the method, the functions of current collecting, controlling and the like of the three-phase electrode of the rotation type electric smelting magnesium furnace can be achieved, the error between the current of the three-phase electrode and the current set value is stabilized within the allowable error range, and electric energy consumption is reduced while the product quality is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of process control of an electric fused magnesium furnace, and in particular relates to an automatic control device for a rotary electric fused magnesium furnace and an electrode current control method. Background technique [0002] Fused magnesia is made of selected magnesite ore or high-purity light-burned magnesium particles, which can be smelted and purified in a three-phase AC rotary fused magnesia furnace, and then cooled and crystallized. During the smelting process, the position of the three-phase graphite electrodes needs to be constantly adjusted to keep the current of the three-phase electrodes within a reasonable range near the current setting value, thereby ensuring a stable smelting process; from the perspective of automatic control, the electric fused magnesium furnace smelting It is the key to the smooth operation of the smelting process to realize the stable tracking of the current set value...

AI Technical Summary

Problems solved by technology

At present, the current control of the rotary fused magnesium furnace mostly adopts the electrode lifting control method based on the switching value of the relay, the electrode lifting action range is large, and the current fluctuation is large; the feeding operation, that is, the start-stop control of the electric vibrator also needs to be realized manually. , the amount of feed and the interval between feeds cannot be strictly guaranteed

The above status quo leads to a lot of room for improvement in the automation level of the rotary fused magnesia furnace

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