LF electrode adjustment energy-saving control method based on sonar feedback

Abstract

The invention discloses an LF electrode adjustment energy-saving control method based on sonar feedback. The method comprises the following steps: step 1, statistical analysis; step 2, data acquisition; step 3, signal processing; step 4, series pole control; step 5, electrode adjustment; step 6, calibrating compensation; step 7, programming; step 8, test optimization; step 9, packaging and releasing; according to the invention, sonar feedback is introduced on the basis of a traditional electrode regulator, automatic acquisition and processing of sonar signals are realized, a constant current type LF electrode regulator is modified, a current set value is dynamically set according to the sonar feedback, a current set point is reduced under the conditions of open arc combustion and embedded combustion, and power consumption is remarkably reduced. The production cost is reduced, huge noise generated in the electrode temperature rising process is reduced, meanwhile, the automation degree is improved, full-automatic control over temperature rising and slagging is achieved at present, manual intervention is not needed, and the misoperation situation is reduced.

Description

technical field [0001] The invention relates to the technical field of LF refining furnaces, in particular to an energy-saving control method for LF electrode regulation based on sonar feedback. Background technique [0002] In the production process of the ladle refining furnace, the molten steel is heated by the electrode heating, which consumes a lot of energy. The traditional electrode adjustment control is divided into constant impedance and constant current adjustment, and the two electrode control strategies have their own advantages and disadvantages; [0003] Constant impedance adjustment has the advantages of relatively energy saving and stable arc starting. The impedance set point of constant impedance is the static impedance set point, not the best impedance set point in the true sense, so it is difficult to achieve optimal efficiency. The sensitivity is also low, and the maximum active power cannot be fully utilized; [0004] The constant current regulator has ...

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Problems solved by technology

[0002] In the production process of the ladle refining furnace, the molten steel is heated by electrodes, which consumes a lot of energy. The traditional electrode adjustment control is divided into constant impedance and constant current adjustment. The two electrode control strategies have their own advantages and disadvantages;

[0003] Constant impedance adjustment has the advantages of relatively energy saving and stable arc starting. The impedance set point of constant impedance is a static impedance set point, not the real impedance optimal set point, so it is difficult to achieve optimal efficiency. The controller The sensitivity is also low, and the maximum active power cannot be fully utilized;

[0004] The constant current regulator has the advantages of high sensitivity and fast temperature rise. The three-phase electrode regulator does not have the characteristics of automatic decoupling, that is, the mutual interference between the three-phase electrode actions is relatively large. After the system enters a steady state, it is still greatly affected by errors. Easy to vibrate, poor energy saving effect;

[0005] Both electrode regulators have huge noise during open arc combustion or embedded combustion caused by special process requirements or poor slagging on site, which wastes a lot of energy. The set points of constant current and constant impedance are both static , due to the nonlinear and large time-lag characteristics in the heating process of the LF ladle refining furnace, the set point is often not optimal, and cannot adapt to changes in working conditions;

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