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Converter dynamic bottom blowing method based on audio frequency slag melting

An audio frequency and converter technology, which is applied in the field of dynamic bottom blowing of converters based on audio frequency slag slag treatment, can solve the problems of poor improvement effect of bottom blowing, inability to adjust adaptively, and ineffective bottom blowing effect, so as to stabilize converter operation and solve the problems of bottom blowing. Untimely adjustment of splashing and back-drying, improving the effect of bottom blowing slag removal

Active Publication Date: 2021-07-02
LAIWU STEEL YINSHAN SECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the problem existing in the prior art that since the flow rate of the bottom blowing is set in advance, it cannot be adaptively adjusted according to the real-time slag condition change in the furnace, resulting in a poor improvement effect of the bottom blowing, and the effect of the bottom blowing is not obvious, and provides a A Dynamic Bottom Blowing Method of Converter Based on Audio Slagging

Method used

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  • Converter dynamic bottom blowing method based on audio frequency slag melting
  • Converter dynamic bottom blowing method based on audio frequency slag melting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A dynamic bottom blowing method for converters based on audio frequency slag removal. In this embodiment, the steel type Q345R is produced. Taking a 120T converter as an example, add 130t of molten iron, 10t of scrap steel, 0.55% of silicon content in molten iron, 0.145% of phosphorus content, and a temperature of 1322°C , Q345R requires phosphorus content ≤ 0.020%.

[0034] The control method is as follows:

[0035](1) When blowing starts, set the third-level flow mode (single gun 150L / min) for the bottom blower. If the audio curve approaches the back-drying area for more than 5 seconds, the bottom blower will automatically switch to the second-level flow mode (single gun 100L / min), until converted to the first level flow mode (single gun 60L / min).

[0036] (2) After 8 minutes of blowing, the reaction in the furnace enters the dry-back period, and the bottom blowing flow rate is set to the first-level flow mode. According to the audio frequency slag detection results...

Embodiment 2

[0042] Different from Example 1, the setting mode conversion time is 3 seconds, and the results are as follows:

[0043] Using this operation method, under the same operation model, the control of the smelting process is stable, there is no splashing and dry-back, the end-point determination of phosphorus is 0.025%, the steel output is 131.5t, the blowing loss is 6.2%, and the composition control is qualified.

Embodiment 3

[0045] Different from Example 1, the setting mode conversion time is 9 seconds, and the results are as follows:

[0046] With this operation method, the control of the smelting process is stable, there is no splashing and back-drying, the end-point determination of phosphorus is 0.023%, the steel output is 131.2t, the blowing loss is 6.5%, and the composition control is qualified.

[0047] In addition, the inventors have obtained through experiments of different mode conversion times that if the mode conversion time is lower than 3 seconds or higher than 10 seconds, the slag removal effect in the furnace cannot be improved in time, so the mode conversion time setting of 5 seconds is the best setting .

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Abstract

The invention provides a converter dynamic bottom blowing method based on audio frequency slag melting. The converter dynamic bottom blowing method comprises the following steps that (1), an optimal slag melting curve is set according to an audio frequency slag melting system; (2), the converter bottom blowing flow quantity is set to be in a three-stage flow quantity mode from low flow quantity to high flow quantity; (3), blowing refining is started, the bottom blowing mode is set as the third-stage flow quantity mode, and the corresponding bottom blowing mode is converted according to the audio frequency curve deviation condition; (4), after the blowing refining is performed for 8 minutes, the bottom blowing mode is set as the first-stage flow quantity mode, and the corresponding bottom blowing mode is converted according to the audio frequency curve deviation condition; and (5), the blowing refining enters a carbon catching period, the bottom blowing mode is set as the second-stage flow quantity mode, and the corresponding bottom blowing mode is converted according to the audio frequency curve deviation condition. According to the converter dynamic bottom blowing method based on the audio frequency slag melting, timely adjustment can be performed before an audio frequency curve reaches a back-dry line or a splashing line, the top-bottom combined blowing converter bottom blowing slag melting effect can be improved, the problem that splashing and back-dry adjustment of a converter is not timely is solved, and converter operations are greatly stabilized.

Description

technical field [0001] The invention belongs to the field of converter steelmaking, and in particular relates to a converter dynamic bottom blowing method based on audio frequency slag melting. Background technique [0002] At present, domestic steel mills mostly use top-bottom double-blowing converters for converter steelmaking. The combined blowing method uses bottom-blown airflow to overcome the weakness of insufficient stirring ability of the top-blown oxygen flow on the molten pool, which can make the reaction in the furnace close to balance and reduce iron loss. At the same time, it retains the advantages of easy control of the slagging process by the top blowing method, so it has better technical and economic indicators than top blowing and bottom blowing. [0003] The entire blowing process of the converter can be divided into the early splashing period, the mid-term back-drying period, and the late-splashing period according to the slag oxidation. In order to detec...

Claims

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Application Information

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IPC IPC(8): C21C5/34
CPCC21C5/34C21C2300/06Y02P10/25
Inventor 尚游宁伟张海波刘俊宝王强李少帅高志滨刘忠建
Owner LAIWU STEEL YINSHAN SECTION CO LTD
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