Automatic control method for double slag operation of converter

An automatic control system, converter technology, applied in the direction of manufacturing converters, etc., can solve problems such as difficulty in model automation control

Inactive Publication Date: 2010-06-23
QINHUANGDAO SHOUQIN METAL MATERIAL +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the double slag operation will bring difficulties to realize the automatic control of the model due to the interruption of blowing and one-time slag dumping.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0011] Heat number 9Q05088, when the molten iron Si content is 0.67%, after adding molten iron, carry out the following steps:

[0012] 1) Set the double slag lifting gun temperature to 1350°C in the secondary automatic control system, and select the corresponding operation mode;

[0013] 2) When the calculated temperature of the model reaches 1350°C, the oxygen lance is automatically raised, and the furnace shaker starts to shake the slag, pouring out 35% of the previous slag volume, and the data of the slag volume is entered into the secondary model by the operator;

[0014] 3) After the slag dumping is completed, the operator clicks blowing again to start, and the secondary control system controls the rest of the blowing process according to the model calculation value until the gun is lifted at the end point. The results of model calculation and actual control end point are as follows:

[0015]

heat number

steel type

Hot metal Si%

Hot...

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Abstract

The invention relates to an automatic control method for the double slag operation of a converter, which belongs to the technical field of the converter steelmaking. The automatic control method comprises the step of based on a secondary automatic control system, when the content of Si in the molten iron feeding into the converter is higher than 0.60 percent, establishing an independent operation mode in the secondary automatic control system as follows: setting a target parameter of the prophase deslagging of the converter that when a calculating temperature reaches 1,300 to 1,350 DEG C, the operation of automatically lifting the blow gun to stop blowing is carried out; setting the control gun position in the whole process in the secondary automatic control system as low-high-low; setting the process oxygen flow between 300 and 310Nm3 / min; setting the increased oxygen flow in the final stage to between 340 and 350Nm3 / min so as to increase the stirring effect; and setting 30 to 40 percent of the total amount of the slagging materials which are put in the previous stage in a secondary model, wherein the residual slag materials are put when the secondary slagging starts. The invention has the advantages of making the endpoint control accurate, improving the automation control level of the converter and realizing the automation control that the converter utilizes the high Si molten iron to produce the low P molten steel.

Description

technical field [0001] The invention belongs to the technical field of converter steelmaking, and in particular provides an automatic control method for double slag operation of a converter. Background technique [0002] Due to the small furnace volume ratio of small and medium-sized converters, once the molten iron condition fluctuates, the blowing process of the converter is difficult to control, slag overflow, splashing and other phenomena are prone to occur, and the end point is difficult to control. For this reason, small and medium-sized converters often need to be smelted through the operation method of double slag, that is, the slag is poured once in the early stage of blowing, and part of the high Si and high P slag is poured out before the slag is smelted. [0003] In addition, with the development of converter control models, converter smelting has gradually shifted from artificial experience control to mathematical model control, and the smelting mode of automati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/30
Inventor 危尚好张建师王星白占禄石树东
Owner QINHUANGDAO SHOUQIN METAL MATERIAL
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