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Converter steelmaking method through power injection dephosphorization by adopting supersonic speed oxygen lance and supersonic speed oxygen lance

A converter steelmaking and supersonic technology, applied in the manufacture of converters, etc., can solve problems such as difficulty in meeting the requirements of rapid slagging and dephosphorization

Active Publication Date: 2012-08-22
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Intensified stirring mainly relies on top-blown oxygen jets, and bottom-blown as an auxiliary means, but it is still difficult to meet the dephosphorization requirements of rapid slag formation

Method used

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  • Converter steelmaking method through power injection dephosphorization by adopting supersonic speed oxygen lance and supersonic speed oxygen lance
  • Converter steelmaking method through power injection dephosphorization by adopting supersonic speed oxygen lance and supersonic speed oxygen lance
  • Converter steelmaking method through power injection dephosphorization by adopting supersonic speed oxygen lance and supersonic speed oxygen lance

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Experimental program
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Effect test

Embodiment 1

[0041]This embodiment is used in a 120-ton converter. Wear-resistant ceramic hoses are used to connect the powder outlet of the powder spraying equipment with the powder inlet on the oxygen lance body. The bend introduces the oxygen blowing central pipe, and the outlet of the powder supply pipe is located at the nozzle. The nozzle Mach number is 1.9. The oxygen flow rate of the oxygen inlet tube is 25000-28000Nm 3 / h, the pressure is 0.65-0.85MPa. The supersonic jet powder is limestone powder with a particle size of less than 2mm.

[0042] Specific smelting operation process:

[0043] In the early stage of smelting: the flow rate of limestone powder injection is 200-220kg / min, and the flow rate of conveying carrier gas is 1500Nm 3 / h, at the same time add some lime, after adding magnesium balls, slagging agent, fluorite and other slag-forming materials, use a high gun position of 1.8-2.0m to operate, which is beneficial to slagging and dephosphorization in the steelmaking ...

Embodiment 2

[0049] This embodiment is used in a 300-ton converter. A wear-resistant ceramic hose is used to connect the powder outlet of the powder spraying equipment with the powder inlet of the oxygen lance body. The powder supply pipeline is made of wear-resistant stainless steel with a size of φ120×5mm. The channel is introduced into the inner tube of the oxygen lance with a length of 180mm, and the powder inlet of the powder supply pipeline is located at the lower end of the oxygen inlet tube at 100mm. The nozzle of the oxygen lance has a constriction section and a throat made of tungsten-copper alloy, and the Mach number of the nozzle is 2.05. The oxygen flow rate of the oxygen inlet tube is 65000-69000Nm 3 / h, the pressure is 0.80-0.95MPa. The particle size of the sprayed lime powder is less than 5mm.

[0050] Specific smelting operation process:

[0051] In the early stage of smelting: the flow rate of lime powder injection is 450-500kg / min, and the flow rate of carrier gas for...

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Abstract

The invention relates to a converter steelmaking method through power injection dephosphorization by adopting a supersonic speed oxygen lance and a supersonic speed oxygen lance, which can be used for solving the problems that slagging is slow in the steelmaking process and the dephosphorization rate is low caused by low stirring intensity in a dephosphorization period. A slagging material used for dephosphorization is transmitted through a supersonic speed oxygen lance and is sprayed into a molten pool in a supersonic speed power gas jet flow state and is fully contacted, so that rapid slagging is realized in the steelmaking process; thermodynamic and dynamic conditions of dephosphorization reaction are improved; and the steelmaking dephosphorization rate is improved; a power feeding pipe of the supersonic speed oxygen lance is connected with a oxygen blowing central pipe; the outlet of a power supply pipe is positioned between the upper part of the oxygen lance and the outlet of a sprayer; the inner diameter is 10-150mm; the power injection flow is 30-500kg / min; the carrier gas flow is 50-3000Nm3 / h and the pressure is 0.4-1.4MPa; a wear-resistant material is adopted at the damage part of a lance sprayer; and the mach number is 1.5-2.1. The converter steelmaking method is suitable for30-350 tons of a converter steelmaking dephosphorization process; compared with the traditional steelmaking process, the dephosphorization rate using the method can be improved by over 5%; the consumption amount of the slagging material is lowered by over 10%; and the metal yield is improved by over 0.5%.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a converter steelmaking method for improving the dephosphorization rate by spraying powder with a supersonic oxygen lance and the supersonic oxygen lance used. Background technique [0002] Dephosphorization is one of the most important tasks in the steelmaking process. The key to dephosphorization is to control the initial temperature and slagging speed of the converter, while providing good kinetic conditions. With the improvement of the oxygen supply intensity of the converter and the application of the bottom blowing technology, the blowing rhythm of the converter steelmaking is continuously accelerated. How to quickly form slag to complete the dephosphorization task of steelmaking has become a key issue in the efficient smelting of the converter. [0003] Dephosphorization mainly uses CaO-based slagging agent, and the slagging process of lime in...

Claims

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Application Information

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IPC IPC(8): C21C5/30C21C5/36C21C5/46
Inventor 朱荣吕明逯志方董凯刘润藻仇永全林腾昌刘文娟刘福海杨凌志聂溪莹谷云岭魏孟宇
Owner UNIV OF SCI & TECH BEIJING
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