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Novel AOD spiral side gun

A spiral type, side gun technology, applied in the field of the new AOD spiral side gun, can solve the problems of short life of the furnace lining, uneven wear and erosion, etc., and achieve the effect of active molten pool, restraining mechanical erosion, and strong fluctuation

Pending Publication Date: 2021-03-09
BAOSTEEL ENG & TECH GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The biggest disadvantage of the AOD method is the short service life of the furnace lining. The production practice shows that a notable feature of the AOD furnace lining is that it suffers from uneven wear and erosion, and this area is always in contact with the high-temperature molten pool. The general life of the refractory material in the side gun area is only 80 furnaces. , which is undoubtedly closely related to the gas injection conditions and the melt movement mode in the molten pool

Method used

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Embodiment Construction

[0018] Such as Figure 1-5 Shown: a new AOD spiral side gun, which includes a main gun 1, a sub-gun 2 and a spiral liner 3, the main gun is used as a central tube, the sub-gun is set on the outside of the main gun, the main gun and the sub-gun Coaxial setting; the main gun is provided with a spiral liner to make the gas in the main gun rotate.

[0019] The spiral liner is copper with a thickness of 2mm and a pitch of 700mm. If the pitch is too small, the gas flow in the main gun will be affected, and the flow and pressure at the outlet will be significantly reduced, which will affect the refining effect and time; if the pitch is too large, the air flow passing through the main gun will not be able to rotate, and the refining effect will not be improved.

[0020] Described main gun is copper, and its thickness is 3mm, and the diameter of outer wall is 21mm.

[0021] The secondary gun is made of stainless steel with a thickness of 4mm and a diameter of the outer wall of 34mm. ...

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Abstract

The invention relates to a novel AOD spiral side gun. The novel AOD spiral side gun comprises a main gun, an auxiliary gun and a spiral lining plate, wherein the main gun serves as a center pipe, theauxiliary gun is arranged outside the main gun in a sleeving mode, the main gun and the auxiliary gun are coaxially arranged, the spiral lining plate is arranged in the main gun, so that gas in the main gun rotates, the spiral lining plate is made of red copper, the thickness of the spiral lining plate is 2 mm, the screw pitch of the spiral lining plate is 700 mm, the main gun is made of red copper, the thickness of the main gun is 3 mm, the diameter of the outer wall of the main gun is 21 mm, the auxiliary gun is made of stainless steel, the thickness of the auxiliary gun is 4 mm, the diameter of the outer wall of the auxiliary gun is 34 mm. According to the novel AOD spiral side gun, the structure is simple, transformation is convenient, implementation is easy, refractory bricks, a masonry mode and the like do not need to be specially changed, and application and popularization are facilitated.

Description

technical field [0001] The invention relates to a novel AOD spiral side gun. Background technique [0002] The AOD (Argon-Oxygen Decarburization) method is a refining method for smelting stainless steel by blowing oxygen to molten steel under normal pressure for decarburization, and blowing argon (or nitrogen) at the same time to reduce the partial pressure of carbon monoxide to achieve carbon removal and chromium retention. AOD equipment is mainly composed of furnace body, support ring, tilting mechanism, oxygen lance, side lance and other systems. The AOD furnace is characterized in that the argon-oxygen gas is horizontally injected into the molten pool from the side wall near the bottom of the furnace through multiple (≥3) sets of side guns, the jet gas drives the molten pool in the AOD to flow, and the refining reaction takes place between the gas and liquid phases . Many AOD furnaces that have been put into production in my country are used for the production of stain...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/072
CPCC21C7/072
Inventor 王海江李福昌金在峰
Owner BAOSTEEL ENG & TECH GRP
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