Operation method of lifting lance in the midway of converter steelmaking under dry dedusting condition

A technology for dry dust removal and converter steelmaking, which is applied in the manufacture of converters and other directions, can solve problems such as blasting and waste electrostatic precipitators, high explosion hazards, and production interruptions, and achieves improved converter productivity, extended service life, and stabilized production rhythm. Effect

Inactive Publication Date: 2013-05-01
宣化钢铁集团有限责任公司 +1
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AI Technical Summary

Problems solved by technology

During the blowing process of the converter, especially in the mid-stage of decarburization, a gun-lifting accident occurs. The explosion venting caused by improper handling and re-lowering of the gun is extremely harmful, ranging from causing production interruption to blowing up the entire electrostatic precipitator or even causing personal accidents. happened

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  • Operation method of lifting lance in the midway of converter steelmaking under dry dedusting condition
  • Operation method of lifting lance in the midway of converter steelmaking under dry dedusting condition
  • Operation method of lifting lance in the midway of converter steelmaking under dry dedusting condition

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Embodiment Construction

[0018] The present invention will be further described below through the examples (the present example is a 150 ton converter).

[0019] An operation method for lifting a gun in the middle of converter steelmaking under the condition of dry dust removal, comprising the following steps:

[0020] ① Dump the slag immediately after the gun is lifted, and find out the reason for the gun lifting; when the converter smelting enters the decarburization period, a considerable part of FeO has been accumulated in the slag, shake the furnace immediately after lifting the gun halfway, and pour out most of the oxidized slag as much as possible, In this way, the FeO in the slag will not react rapidly with the C in the molten pool to produce a large amount of CO gas when the gun is fired again, effectively avoiding the occurrence of explosion venting;

[0021] ② The time of firing the gun again should be at least 3 minutes apart from the time of firing the gun, which is conducive to the remov...

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Abstract

The invention relates to an operation method of lifting a lance in the midway of converter steelmaking under a dry dedusting condition, and belongs to the technical field of converter steelmaking operation process. The technical scheme is as follows: 1, lifting the lance to completely dump dregs; 2, standing for three minutes; 3, adding 500 jin of silicon iron; 4, swinging a converter forwards and backwards; 5, flushing nitrogen for 60 seconds; 6, descending the lance to observe components; and 7, enabling the oxygen lance to follow slowly. Therefore, the operation method provided by the invention is also called a seven-step operation method of lifting the lance in the midway of converter steelmaking under the dry dedusting condition. The operation method has the beneficial effects that the explosion limit of the mixed gas of CO and O2 is effectively kept away, so that the explosion venting is avoided. Practice shows that the implementation of the seven-step processing method of lifting the lance in the midway achieves zero explosion venting, so that the production rhythm of the converter is stabilized to the greatest extent, the capacity of the converter is increased, and the service life of an electrostatic precipitator is prolonged.

Description

technical field [0001] The invention relates to an operation method for lifting a gun in the middle of converter steelmaking under the condition of dry dust removal, and belongs to the technical field of converter steelmaking operation technology. Background technique [0002] At present, new large-scale steel mills mostly adopt dry dust removal technology. The advantages of this technology are: water saving, power saving, environmental protection and economy. Among them, the electrostatic precipitator is the core equipment of the dry dust removal system. The analysis of the explosion venting mechanism of the electrostatic precipitator is as follows: In the initial stage of converter blowing, because the flue and dust collector are filled with air, which contains about 21% of oxygen, when the converter blows At the beginning, oxygen will react with C in the molten iron to produce a large amount of CO. As the blowing progresses, more and more CO enters the flue gas. When the ...

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Application Information

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IPC IPC(8): C21C5/34
Inventor 王金龙贾建明闫军蔡飞刘永军张全梁佳乔力赵海澍
Owner 宣化钢铁集团有限责任公司
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