Converter oxygen lance for converter gas wake flow

Abstract

The utility model relates to the technical field of converter steelmaking, in particular to a converter oxygen lance for converter gas wake flow, which comprises a nozzle outer pipe, a first nozzle middle pipe, a second nozzle middle pipe and a nozzle inner pipe which are sequentially arranged from outside to inside, and a nozzle crown is welded at the end part of the nozzle outer pipe; an oxygen spraying pipe is arranged in a spraying opening in the end face of the head crown of the sprayer and is concentric with the spraying opening, and an annular gap is formed between the oxygen spraying pipe and the spraying opening; the end part of the first spray head middle pipe is welded on the outer wall of the expansion section of the nozzle, and a water guide hole communicated with the spray head outer pipe is formed in the first spray head middle pipe. According to the converter oxygen lance, the converter gas and the following flow oxygen are jointly sprayed out, the oxygen spraying pipe of the oxygen lance can be protected from being oxidized, the oxygen spraying pipe is located in the spraying opening, the oxygen spraying pipe and steel slag blown in the converter are made to be almost not burnt or oxidized, the service life of the oxygen lance can be greatly prolonged, and the service life of the converter is prolonged. And the operation rate and the steel yield of the converter are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to converter steelmaking technical field, concretely relates to a converter oxygen lance of converter gas accompanying flow. BACKGROUND

[0002] Oxygen top blown converter is the most main steelmaking equipment in the world at present, through the oxygen lance set on the converter top, blows oxygen to the converter, and refines the molten steel to carry out steelmaking.

[0003] The converter oxygen lance commonly used at present only sprays oxygen to the converter to complete the task of refining molten steel, because the temperature in the converter is as high as 1600 DEG C, and oxygen has very strong oxidizing effect on various elements in the molten steel, and the oxygen hole of the oxygen lance nozzle is continuously oxidized and eroded, the nozzle gradually thins, and then leaks and is scrapped. Therefore, the service life of the converter oxygen lance is about 200 converters, that is, the furnace needs to be stopped to replace the damaged oxygen lance, reduces the working efficiency of the converter, and affects the steel output. SUMMARY

[0004] In view of the above problems, the utility model provides a converter oxygen lance of converter gas accompanying flow to improve the service life of the converter oxygen lance.

[0005] The utility model adopts the technical scheme that a converter oxygen lance of converter gas accompanying flow, include: by the outside to inside set gradually the nozzle outer tube, first nozzle middle tube, second nozzle middle tube and nozzle inner tube, the end of nozzle outer tube welds the nozzle head crown,

[0006] The end face of the nozzle head crown is provided with a plurality of spray holes, each spray hole extends into the converter oxygen lance to form an expansion section, the inner sides of the plurality of expansion sections jointly form a flow guide column extending into the nozzle inner tube, and the outer sides of the expansion sections are welded and fixed with the end of the second nozzle middle tube.

[0007] The oxygen lance is provided with an oxygen lance, and the oxygen lance is arranged concentrically with the spray hole, and an annular gap is formed between the oxygen lance and the spray hole, one side of the end of the oxygen lance is welded and fixed with the flow guide column, and the other side is welded and fixed with the nozzle inner tube.

[0008] The end of the first nozzle middle tube is welded on the outer wall of the expansion section, and the first nozzle middle tube is provided with a water guide hole communicated with the nozzle outer tube.

[0009] Further, the plurality of spray holes are distributed in a circular shape.

[0010] Further, the shape of the oxygen lance is a Laval nozzle.

[0011] Compared with the prior art, the utility model has the following beneficial effects:

[0012] 1. The converter gas is neutral, without oxidizing, which can protect the oxygen lance from being oxidized, the oxygen lance is located in the nozzle, so that it is not burned by the slag in the furnace, and the service life of the oxygen lance is greatly improved, and the operation rate and steel production of the converter are improved.

[0013] 2. The converter gas and the steelmaking oxygen form a flow, which makes the oxygen blowing speed slow, the rigidity good, the oxygen penetration ability to the molten pool strong, the stirring effect good, the temperature rising fast, the carbon reduction good, the slag reduction good, the oxygen utilization rate high, and the steelmaking effect good.

[0014] 3. The converter gas is sprayed together with the oxygen, after a certain distance, the converter gas is mixed with part of the oxygen, burns under the high temperature condition in the converter, forms a flame, improves the temperature in the furnace, speeds up the steelmaking speed, and can increase the scrap steel loading amount and reduce the steelmaking cost. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a cross-sectional view of the converter oxygen lance with the converter gas flow;

[0016] In the figure: 1, the nozzle head crown; 2, the nozzle inner tube; 3, the second nozzle middle tube; 4, the first nozzle middle tube; 5, the nozzle outer tube; 6, the nozzle; 7, the expansion section; 8, the flow guide column; 9, the oxygen lance; 10, the water guide hole. DETAILED DESCRIPTION

[0017] The technical scheme of the utility model will be described clearly and completely in combination with the drawings and specific embodiments.

[0018] The utility model provides a kind of converter oxygen lance with the converter gas flow, compared with traditional forging and pressing combined converter oxygen lance, the utility model is by 4 layers of steel pipes, as shown in Figure Figure 1 From outside to inside in sequence: nozzle outer tube 5, first nozzle middle tube 4, second nozzle middle tube 3 and nozzle inner tube 2;Wherein:

[0019] The end of nozzle outer tube 5 is welded with nozzle head crown 1;

[0020] The end surface of nozzle head crown 1 is provided with a plurality of nozzles 6, a plurality of nozzles 6 are preferably distributed in a circular shape, and each nozzle 6 extends into the converter oxygen lance to form an expansion section 7, the inner side of a plurality of expansion sections 7 forms a flow guide column 8 extending into the nozzle inner tube 2, and the outer side is welded and fixed with the end of the second nozzle middle tube 3;

[0021] The oxygen injection pipe 9 is arranged concentrically with the injection port 6, and an annular gap is arranged between the injection port 6 and the oxygen injection pipe 9; in the embodiment, the shape of the oxygen injection pipe 9 is preferably a Laval injection hole; one side of the end of the oxygen injection pipe 9 is welded and fixed with the flow guide column 8, and the other side is welded and fixed with the inner pipe 2 of the injection head;

[0022] In use, oxygen is introduced into the inner pipe 2 of the injection head, and after being guided by the flow guide column 8, the oxygen is sprayed from the injection port 6 along the oxygen injection pipe 9; converter gas is introduced into the second inner pipe 3 of the injection head, and is sprayed from the injection port 6 through the annular gap between the injection port 6 and the oxygen injection pipe 9, that is, the converter gas and the oxygen form a concomitant flow and are sprayed from the injection port 6 together.

[0023] The end of the first inner pipe 4 of the injection head is welded to the outer wall of the expansion section 7, and the first inner pipe 4 of the injection head is provided with a water guide hole 10 which is in communication with the outer pipe 5 of the injection head, so that the cooling water can be introduced into the first inner pipe 4 of the injection head to cool the injection head crown 1, and after being cooled, the cooling water flows into the outer pipe 5 of the injection head through the water guide hole 10 and is discharged, so as to realize the circulation of the cooling water.

[0024] The above only describes the preferred embodiments of the present application and is not used to limit the present application; for those skilled in the art, the present application can be variously changed and modified. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A converter oxygen lance with converter gas flow, characterized in that: include: The nozzle outer tube (5), the first nozzle middle tube (4), the second nozzle middle tube (3) and the nozzle inner tube (2) are sequentially arranged from the outside to the inside, and the end of the nozzle outer tube (5) is welded to the nozzle crown (1); A plurality of nozzles (6) are provided on the end surface of the nozzle crown (1), each nozzle (6) extends into the converter oxygen lance to form an expansion section (7), the inner sides of the plurality of expansion sections (7) together form a guide column (8) extending into the nozzle inner tube (2), and the outer side of the expansion section (7) is welded and fixed to the end of the second nozzle middle tube (3); An oxygen nozzle (9) is provided in the nozzle (6), the oxygen nozzle (9) and the nozzle (6) are arranged concentrically with an annular gap therebetween, one side of the end of the oxygen nozzle (9) is welded and fixed to the guide column (8), and the other side is welded and fixed to the nozzle inner tube (2); The end of the first nozzle middle tube (4) is welded to the outer wall of the expansion section (7), and the first nozzle middle tube (4) is provided with a water guide hole (10) communicating with the nozzle outer tube (5).

2. The converter oxygen lance with converter gas accompanying flow according to claim 1, characterized in that: The plurality of nozzles (6) are distributed in a circular pattern.

3. The converter oxygen lance with converter gas accompanying flow according to claim 1, characterized in that: The shape of the oxygen nozzle (9) is a Laval nozzle hole.

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