Automatic positioning and controlling method for oxygen lance of converter

Abstract

The invention relates to an automatic positioning and controlling method for an oxygen lance of a converter. The method comprises the following steps of: setting the relative height set value of the oxygen lance and acquiring the relative height actual value of the oxygen lance by an absolute value encoder detecting calculation method; calculating a deviation value, wherein the deviation value is acquired by subtracting the relative height actual value from the relative height set value; lifting the oxygen lance at a high speed when the deviation value is greater than 0; descending the oxygen lance at a high speed when the deviation value is less than 0; limiting the rising or falling speed of the oxygen lance at a low speed when the deviation value is less than a first threshold value and greater than a second threshold value; limiting the rising or falling speed of the oxygen lance at an ultralow speed when the deviation value is less than the second threshold value; stopping lifting the oxygen lance when the deviation value is less than a third threshold value; and stopping descending the oxygen lance when the deviation value is greater than a negative fourth threshold value. The automatic positioning and controlling method provided by the invention can quickly and accurately position the oxygen lance at the specified relative height, completely avoiding the overshoot and oscillation.

Description

technical field [0001] The invention relates to a control method for accurate and automatic positioning during the raising and lowering of a converter oxygen lance in a metallurgical steelmaking process. Background technique [0002] In converter steelmaking production, the accuracy of oxygen lance positioning is directly related to the occurrence of decarburization, slagging, heating and splashing in the steelmaking process, which will eventually affect the temperature and carbon content of molten steel at the end of blowing. Production safety, furnace age and gun age also have a great influence. Therefore, the position of the oxygen lance must be well controlled so that the steelmaking process can proceed smoothly. During the whole blowing process, the distance between the oxygen lance tip and the liquid level of the converter bath (called the relative height) is constantly changing, and several different relative heights are set according to the initial, middle and final...

AI Technical Summary

Problems solved by technology

[0003] The traditional oxygen lance automatic positioning control adopts the PID loop adjustment method, which is difficult to take into account the requirements of the rapidity and control accuracy of the system during the control process, and is prone to overshoot and oscillation

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