Integrated tuyere for converter

Abstract

The present invention provides an integrated tuyere for a converter, which is capable of suppressing a decrease in gas flow rate due to deformation or damage of a double-layer metal tube during construction or transportation into the converter in an integrated tuyere for a converter in which one double-layer metal tube and a tuyere refractory are integrated, and which has a simple structure. Specifically, this integrated tuyere for a converter is provided with: a double-layer metal tube (3) having an inner tube (31) and an outer tube (32), the inner tube (31) being filled with a refractory material (35); the double-layer metal pipe (3) is fixed in the through hole (21) by the tuyere refractory (2) through a bonding material (22); and a metal case (4) having a bottom plate (41) covering the lower end surface of the tuyere refractory (2) and a side plate (43) covering the lower side surface of the tuyere refractory (2). The thickness T of the metal shell (4) is more than 6 mm and less than 20 mm, and the length (L) of the metal shell (4) is more than 3% and less than 50% of the total length of the tuyere refractory. An outer pipe (32) of the double-layer metal pipe is provided with an upper outer pipe (321) and a lower outer pipe (322), the thickness of the lower outer pipe (322) is larger than 3 mm, and the lower outer pipe (322) is welded and fixed to a bottom plate (41) of the metal shell.

Description

technical field [0001] The present invention relates to an integrated tuyere for a converter in which a double-layered metal pipe filled with refractories in an inner tube and a tuyere refractory are integrated, and is installed on the bottom of a converter for blowing gas into a converter for steelmaking on the vent. Background technique [0002] The bottom of the converter is provided with a tuyere as a refractory for blowing gas. There are several types of the tuyere depending on the purpose of use. For example, when the main purpose is to stir the molten steel in the converter, there are tuyeres in which a plurality of thin metal tubes are buried in the refractory material, or a double-tube metal tube in which the inner tube is filled with refractory material is used. tuyere, etc. [0003] Here, "a double-layered metal pipe in which an inner pipe is filled with a refractory" means that the inner metal pipe (inner pipe) of the double-layered metal pipe is filled with a...

AI Technical Summary

Problems solved by technology

[0009] In this way, in the tuyere structure of cited document 3, the tuyere refractory and the annular tuyere are integrally formed, but since the annular tuyere protrudes from the tuyere refractory, it is difficult to hold the protruding part during construction or transportation into the converter. When the annular tuyere is lifted or collided with an object, there is a possibility that the annular tuyere is deformed and the annular space (slit) is crushed

When the slit is crushed, the required gas flow rate cannot be ensured, which may hinder the operation of the converter

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