Follow-up oxygen lance nitrogen seal device

Abstract

The invention relates to a follow-up oxygen lance nitrogen seal device comprising a conical seat, a conical plate and a seal plate, wherein, the conical plate and the seal plate are sheathed on the oxygen lance; the conical seat at least comprises a reversed conical inner cone seal surface; the conical plate comprises a reversed conical outer cone seal surface matched with the inner cone seal surface of the conical seat, and an oxygen lance channel arranged in the outer cone seal surface and the diameter of which is larger than the outer diameter of the oxygen lance; an upper cover plate and a lower cover plate are arranged between the outer cone seal surface and the oxygen lance channel; the seal plate is a cylindrical object, and can be movably located on the upper cover plate of the conical plate; a plurality of nitrogen seal rings are fixed in the side wall of the seal plate in an axial direction; the oxygen lance enters the oxygen lance inlet of the converter through the conical plate; the inner diameter of the nitrogen seal ring and the outer diameter of the oxygen lance form clearance fit; and the nitrogen is spouted out by the nitrogen seal ring. The seal plate provided by the invention can move on the surface of the conical plate along the oxygen lance, thus the oxygen lance not only has a certain free degree in a horizontal level, but also has good seal effect.

Description

technical field [0001] The invention relates to an oxygen lance nitrogen sealing device, in particular to a follow-up oxygen lance nitrogen sealing device suitable for preventing the smoke and carbon monoxide from escaping from the oxygen lance mouth during converter steelmaking and blowing. Background technique [0002] In the converter steelmaking operation, a large amount of high-temperature flue gas and carbon monoxide will be produced during blowing. If the high-temperature flue gas and carbon monoxide escape from the oxygen lance, it will burn the equipment and cause personnel poisoning. Therefore, the oxygen lance must be Set nitrogen blanketing device. Figure 5 It is a known oxygen lance nitrogen blanketing device. A conical seat 72 is fixed on the top of the oxygen lance inlet port 5, and a conical sealing disc 71 can be seated in the conical seat 72. The inner circumference of the sealing plate 71 is provided with a plurality of sealing plates 711 with certain int...

AI Technical Summary

Problems solved by technology

Although this structure solves the above-mentioned stuck gun problem, due to the contact surface between the sealing cover plate of the nitrogen sealing plug and the upper cover plate of the nitrogen sealing seat and between the positioning plate three of the nitrogen sealing plug and the lower cover plate of the nitrogen sealing seat They are all horizontal contact surfaces. When the blowing gap of the oxygen lance is lifted with the nitrogen seal, the site environment is dirty and the steel slag attached to the oxygen lance will fall on the upper and lower cover plates of the nitrogen seal, which will cause The nitrogen sealing plug and the nitrogen sealing seat cannot be tightly fitted, and the nitrogen sealing effect is lost

In addition, since the annular seam of nitrogen sealing in this structure is a horizontal annular seam, the blown air curtain is horizontal, and the sealing effect is not good

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