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 cha

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

Example Embodiment

[0032] Example 1

[0033] A converter dynamic bottom blowing method based on audio segments, and the steel type Q345R is produced in this embodiment, as an example of 120T converter, add iron water 130T, waste steel 10T, iron silicon content 0.55%, phosphorus content of 0.145%, iron water temperature 1322 ° C Q345R requires phosphorus content ≤ 0.020%.

[0034] The control method is as follows:

[0035](1) Blowing, the bottom blow is set to set the third stage flow mode (single gun 150L / min), if the audio curve is adjacent to the return area for more than 5 seconds, the bottom blow is automatically converted into the second level flow mode (single gun 100L / min) until it is converted to the first stage flow mode (single gun 60L / min).

[0036] (2) When it is blown to 8 minutes, the furnace reaction enters the return period, the bottom blow flow is set to the first stage flow mode, according to the audio segments detection result, if the audio curve is close to more than 5 seco...

Example Embodiment

[0041] Example 2

[0042] Unlike Example 1, the set mode conversion time is 3 seconds, as follows:

[0043] With this method of operation, under the same operating model, the smelting process is stable, no splash and return, the end point is 0.025%, the steel volume is 131.5T, the blow is 6.2%, and the component control is qualified.

Example Embodiment

[0044] Example 3

[0045] Unlike Example 1, the set mode conversion time is 9 seconds, as follows:

[0046] With this method, the smelting process is stable, and no splash and return, the end point is measured by 0.023%, and the steel volume is 131.2T, the blow is 6.5%, and the component control is qualified.

[0047] In addition, the inventors have been derived by the experiment of different mode conversion time, and the mode conversion time is less than 3 seconds or higher than 10 seconds, and the furnace-in-flawed effect cannot be improved in time, so the mode conversion time is set for 5 seconds to optimally set .

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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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