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Efficient dephosphorization oxygen lance spray head and blowing technology

A technology of oxygen lance nozzle and oxygen lance, which is applied in the field of iron and steel metallurgy, to prevent the formation of dry slag, achieve a significant dephosphorization effect, and improve the dephosphorization rate

Pending Publication Date: 2020-10-30
UNIV OF SCI & TECH LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, increasing the generation of metal droplets in foamed slag is a huge challenge for steel mills to improve the slag-gold interface reaction and increase the dephosphorization rate.

Method used

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  • Efficient dephosphorization oxygen lance spray head and blowing technology
  • Efficient dephosphorization oxygen lance spray head and blowing technology
  • Efficient dephosphorization oxygen lance spray head and blowing technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] In order to verify the obvious effect of the present invention compared with the traditional oxygen lance nozzle, a comparative experiment between the high-efficiency dephosphorization oxygen lance nozzle and the traditional oxygen lance nozzle under the same smelting conditions was carried out. The specific dimensions of the two oxygen lance nozzles are shown in Table 1.

[0057] Table 1 Geometric parameters of traditional oxygen lance nozzle and high-efficiency dephosphorization oxygen lance nozzle for 260t converter

[0058]

[0059] During the experiment period, the steel produced is automobile plate, the amount of molten iron is 260t, the amount of scrap steel is 30-40t, the oxygen pressure of the main pipe is 1.4MPa, the working oxygen pressure is 1.0MPa, and the flow rate of oxygen supply is 54000Nm3 / h. The position of the blowing gun varies from 2.6m to 3.1m, the position of the process gun varies from 2.4m to 2.7m, and the position of the carbon pulling gun v...

Embodiment 2

[0070] Compare "a single-channel double-structure oxygen lance nozzle and blowing process". The purpose of this technology 1) single-channel double-structure oxygen lance nozzle and blowing process is to improve the jet flow intensity, ensure the stirring effect of the jet flow oxygen lance on the molten pool, and reduce the occurrence of splashing at the same time. The purpose of the invention is to increase the amount of spatter in the furnace generated after the jet flow of the nozzle of the oxygen lance interacts with the molten pool. 2) The applicable steel types of the two are different. The single-channel double-structure oxygen lance nozzle has wider applicability, but for steel types that require high dephosphorization rate, the dephosphorization effect is not much different from that of the traditional oxygen lance. The stirring effect of the high-efficiency dephosphorization oxygen lance on the molten pool may not be as good as that of the single-channel dual-struct...

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Abstract

The invention belongs to the technical field of steel metallurgy and particularly relates to an efficient dephosphorization oxygen lance spray head and a blowing technology. The efficient dephosphorization oxygen lance spray head comprises a spray head oxygen inlet, a water inlet ring joint, a water outlet ring joint and multiple oxygen lance spray holes. The efficient dephosphorization oxygen lance spray head is characterized in that the multiple oxygen lance spray holes are distributed in the manner that a set of oxygen lance spray holes I and a set of oxygen lance spray holes II are arranged in a staggered manner; the set of oxygen lance spray holes I are distributed in the periphery of the end face of the spray head; the set of oxygen lance spray holes II are distributed in the inner side of the end face of the spray head; the diameter of the oxygen lance spray holes I is larger than that of the oxygen lance spray holes II; and the inclined angle of the oxygen lance spray holes I is larger than that of the oxygen lance spray holes II. Compared with a traditional oxygen lance spray head with the same converter capacity, the arrangement scheme of the large spray holes of the oxygen lance spray head weakens the interaction among all jet flow strands, the contact area between jet flow and a molten pool is enlarged, the drop generation rate generated under the jet flow and molten pool effect is obviously increased, and the dephosphorization effect is obvious.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to an oxygen lance nozzle for high-efficiency dephosphorization and a blowing process. Background technique [0002] During top-blown basic furnace (BOF) steelmaking, it is very important to form molten slag with proper composition such as basicity and FeO content, because dephosphorization mainly depends on slag composition, furnace temperature and the Kinetics and mass transfer processes of mixing with slag. In blowing, carbon oxidizes to form carbon monoxide gas and tries to escape through the slag causing volume expansion, commonly referred to as slag foaming, this foam provides a large interfacial area between the slag, metal and gas phase, thereby promoting The interface reaction is improved, and the dephosphorization effect is improved. The generation and maintenance of slag foam is mainly controlled by the oxygen jet flow of the oxygen lance. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/46C21C7/064
CPCC21C5/4606C21C7/064
Inventor 刘坤刘广强韩鹏冯亮花
Owner UNIV OF SCI & TECH LIAONING
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