Automatic controlling method for converter oxygen lance used for converting low-carbon steel

Abstract

The invention provides an automatic controlling method for a converter oxygen lance used for converting low-carbon steel. The method comprises a data collecting and analyzing step, a raw material controlling step, and an oxygen lance position controlling step. The method is characterized in that: during an entire low-carbon steel converting procedure in a converter, an oxygen lance position is controlled according to the variation of the accumulated amount of oxygen in the converter; the oxygen lance position is fixed as a slagging position since the converting is started to 20% of a total converting time is reached; the oxygen lance is automatically adjusted according to a determined scheme since 20% of the total converting time is reached to 90% of the total converting time is reached; the oxygen lance position is fixed as a carbon catching position since 90% of the total converting time is reached to 100% of the total converting time is completed, and a converting end point is determined according to the decarbonization speed; when a tapping requirement is satisfied, the oxygen lance is stopped, and the converting is stopped. With the method provided by the invention, the entire converting procedure can be continuously and dynamically corrected, such that oxygen lance position automatic controlling can be realized.

Description

technical field [0001] The invention belongs to the converter smelting technology, in particular to an automatic control method for the oxygen lance position in the whole process of converter blowing based on the furnace gas analysis technology. Background technique [0002] From the birth of the converter to the present, the control technology of converter smelting has gone through the process from manual experience control to computer automatic control. Due to the fast reaction speed and short time of converter smelting, it is difficult to use the method of sampling analysis to monitor the steelmaking process, and it is also impossible to directly observe the reaction process in the furnace. Instead, it can only be gradually formed according to changes in indirect information such as flames, sounds, and furnace gases. According to the experience of the operator, during the blowing process, the feeding, the position of the oxygen lance, and even the intensity of oxygen supp...

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Problems solved by technology

However, this method uses an optical sensor probe to collect the flame intensity at the furnace mouth, and the accurate determination of the flame intensity is greatly affected by factors such as the operation of the oxygen lance, the feeding method, the condition of the furnace body, and the condition of the smoke hood. In addition, the error of the model, It is difficult to effectively monitor the whole process of blowing

[0007] Due to the fluctuation of molten iron, scrap steel and slagging material conditions, it is difficult to effectively monitor the slag melting process, so it is impossible to reduce the probability of slag dry-out and splashing

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