SU1565897A1 - Tuyere - Google Patents

Abstract

The invention relates to metallurgy, in particular to the treatment of steel in the molten state with powdered materials. The purpose of the invention is to increase the service life of the tuyere. It contains a central tube 3, installed with an annular gap 4 and deformed with an arc-shaped bend. The outer surface of the protective tube 3 is covered with a lining 5. In the central tube 1, a throttle element 6 is fixed with an axis of symmetry of a wavy shape, placed in front of an arcuate bend of the greatest radius of this tube. The input of this element protrudes into the annular gap 4, and the outlet is located on the side of the inner surface of the central tube 1 in the direction of the gas-powder mixture. A part of the cooling medium on the inner surface of the central tube 1 along the largest radius of its arcuate bend has the form of a protective layer 7. 2 Il.

Description

The invention relates to metallurgy, in particular to the treatment of steel in the molten state with powdered materials.

The aim of the invention is to increase the service life of the tuyere.

Design changes provide the possibility of applying to the inner surface of the central tube along the maximum radius of its arcuate bending of a liquid or gas substrate, which prevents particles of the powder mixture from entering this area. Moreover, this does not require performing a separate pipeline, since the medium that creates the cooling effect in the annular gap is used. A part of this medium, entering the central tube through the throttle element, creates a double effect, since it not only continues to perform cooling, but also provides protection to the area that is most susceptible to wear in known devices.

Preventing the center tube from wearing out increases the life of the tuyere.

FIG. 1 shows a tuyere, a longitudinal section; in fig. 2 shows section A-A in FIG. one.

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The tuyere contains a central tube for feeding powdered material; JioB 2 in a gas flow and a protective tube 3 which are installed one relative to another with an annular gap k and jointly deformed with (Obtaining an arcuate bend. The outer surface of the protective tube 3 Covered with lining 5. Curved down tuyere through a replaceable tip immersed in a liquid metal (not shown).

The central tube I, is made with an aperture in which the throttle element 6 is fixed with an axis of symmetry of a wave-like shape placed in front of an arcuate bend of the greatest radius of this tube. The entrance of the throttle element 6 protrudes into the annular gap A, and the outlet is located on the side of the inner surface of the central tube 1 in the direction of the gas-powder mixture. The annular gap k is intended to supply in the direction of the arrow a hydrocarbon liquid, in particular, a lubricant, or a gas such as argon, propane or nitrogen. A part of this cooling medium, having passed through the throttle element 6, acquires on the inner surface of the central tube 1 along the maximum radius of its arcuate bend the form of a protective layer 7 "

The designation of element 6 in the form of throttles with a wavy-shaped axis of symmetry prevents the gas-powder mixture from entering the annular channel C when the pressure in it is compared to the pressure inside the central tube 1. The lance works as follows. Through the annular gap 4 in the direction of the arrow serves the hydrocarbon fluid, and through the Central tube 1 - gas-powder mixture. Before the arcuate bend of the largest radius of the central tube 1, a portion of the carbon dioxide fluid passes through the throttle element b in the direction of supply of the gas-powder mixture, which picks up the hydrocarbon fluid. As a result, this liquid is applied.

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in the form of a protective layer 7 on the inner surface of the central tube 1 along the largest radius of its arcuate bend. The protective layer 7 performs the function of a substrate, which prevents the ingress of particles of powdered materials 2 to the arcuate bend of the central tube 1 and thus protects it from wear in the most desirable place. In this case, the hydrocarbon-liquid creates a cooling effect both along the movement in the annular gap 4, and when it enters the inner surface of the central tube 1 "

If gas is used as the cooling medium in the annular gap 1, then, having passed through the throttle element 6, it rushes along the arcuate bend of the central tube 1 and, due to the pressure of its flow, pushes the powdered materials 2 away from the arcuate bend of the central tube 1. way wear.

The technical and economic effect of the proposed tuyere is to increase the service life by protecting the central tube from wear on its arcuate portion.

Claims (1)

Invention Formula A tuyere containing one central tube for supplying the gas-powder mixture and a protective tube made with an arcuate bend, which are arranged with an annular gap, are characterized in that, in order to increase the service life of the tuyere, it is provided with a throttle element with a symmetrical axis of the wave-like shape installed in a hole made in the central tube and placed in front of an arcuate bend of the greatest radius of this tube, with the entrance of the throttle element protruding into the annular gap, and the output of It is located from the side of the inner surface of the central tube in the direction of the gas-powder mixture. Chfie .2