CN214830457U

CN214830457U - Large reducing oxygen gun for steel-smelting

Info

Publication number: CN214830457U
Application number: CN202121367454.4U
Authority: CN
Inventors: 谷鑫
Original assignee: Cangzhou Fenqi High Pressure Pipe Fittings Co ltd
Current assignee: Cangzhou Fenqi High Pressure Pipe Fittings Co ltd
Priority date: 2021-06-18
Filing date: 2021-06-18
Publication date: 2021-11-23
Anticipated expiration: 2031-06-18

Abstract

The utility model discloses a large-reducing oxygen lance for steelmaking, which comprises a body, wherein the body comprises an oxygen lance inner pipe, an oxygen lance middle pipe, an oxygen lance outer pipe and a spray head, the oxygen lance middle pipe comprises a middle straight section, a middle reducing section and a middle reducing section which are connected in sequence, the oxygen lance outer pipe comprises an outer straight section, an outer reducing section and an outer reducing section which are connected in sequence, and the middle reducing section, the outer reducing section and the outer reducing section are seamless reducing pipes; the spray head is of an integrated structure and comprises an inner layer connecting pipe, a middle layer connecting pipe and an outer layer connecting pipe, a water guide hole is formed in the middle of the bottom end face of the middle layer connecting pipe, and a plurality of air passages are formed between the bottom end face of the outer layer connecting pipe and the bottom end face of the inner layer connecting pipe. The utility model adopts the above structure of the large reducing oxygen lance for steelmaking, adopts the seamless reducing pipe to improve the safety of the oxygen lance, and the taper of the oxygen lance body is large, so that the slag adhered on the outer wall of the oxygen lance is changed to fall off.

Description

Large reducing oxygen gun for steel-smelting

Technical Field

The utility model relates to the technical field of oxygen lances, in particular to a large reducing oxygen lance for steelmaking.

Background

The oxygen lance is important equipment for oxygen blowing and steel making of a modern converter, and modern rapid steel making not only requires the oxygen lance to have high oxygen supply strength, but also requires the oxygen lance to be stable in blowing and not to be stuck, so that compact connection between furnaces can be ensured during steel making. In order to solve the problem that the oxygen lance does not stick to the lance, some manufacturers use the taper oxygen lance, but because the taper of the body of the common taper oxygen lance is smaller, the middle part is provided with a transition straight section, the problem that the oxygen lance sticks to the lance cannot be fundamentally solved. In addition, most of the middle cone pipes of the oxygen lances in the prior art are rolled, which affects the safety of the oxygen lances to a certain extent.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a big reducing oxygen rifle is used in steelmaking adopts seamless reducing pipe to improve the security of oxygen rifle, and the tapering of oxygen rifle body is big for the slag that glues on the oxygen rifle outer wall changes and drops.

In order to achieve the purpose, the utility model provides a big reducing oxygen lance for steelmaking, which comprises a body, the body comprises an oxygen lance inner pipe, an oxygen lance middle pipe, an oxygen lance outer pipe and a spray head, the oxygen lance inner pipe is a straight pipe, the oxygen lance middle pipe comprises a middle straight section, a middle reducing section and a middle reducing section which are connected in sequence, the oxygen lance outer pipe comprises an outer straight section, an outer reducing section and an outer reducing section which are connected in sequence, the top end of the middle straight section is hermetically connected with the outer wall of the oxygen lance inner pipe, the top end of the outer straight section is hermetically connected with the outer wall of the middle straight section, a groove is arranged at the bottom end of the outer reducing section, the groove is positioned at the outer edge of the outer reducing section, and the middle reducing section, the inner reducing section, the outer reducing section and the outer reducing section are seamless reducing pipes;

the spray head is of an integrated structure and comprises an inner layer connecting pipe, a middle layer connecting pipe and an outer layer connecting pipe, a water inlet cavity is formed between the inner layer connecting pipe and the middle layer connecting pipe, a water outlet cavity is formed between the middle layer connecting pipe and the outer layer connecting pipe, a water guide hole is arranged in the middle of the bottom end face of the middle layer connecting pipe, a plurality of air passages are arranged between the bottom end face of the outer layer connecting pipe and the bottom end face of the inner layer connecting pipe, the air passages penetrate through the middle layer connecting pipe, the upper end opening of each air passage is close to the center line of the spray head relative to the lower end opening, the outer wall of the inner layer connecting pipe is matched with the inner wall of the oxygen lance inner pipe, a sealing ring is arranged on the outer wall of the inner layer connecting pipe, the outer wall of the middle layer connecting pipe is matched with the inner wall at the tail end of the middle reducing section, and a sealing gasket is arranged on the outer wall of the middle layer connecting pipe, the outer layer connecting pipe is welded with the tail end of the outer reducing section, and a convex ring matched with the groove in structure is arranged on the outer layer connecting pipe.

Preferably, the top of the outer straight section is connected with a water outlet pipe, the top of the middle straight section is connected with a water inlet pipe, and the inner pipe of the oxygen lance is connected with an oxygen inlet pipe.

Preferably, the outer diameter of the gasket is gradually increased from the end close to the intermediate diameter section to the end far away from the intermediate diameter section.

Preferably, the taper of the inner and outer tapered sections is 2.5-8 °.

Therefore, the utility model adopts the structure of the large reducing oxygen lance for steelmaking, adopts the seamless reducing pipe to improve the safety of the oxygen lance, and the taper of the oxygen lance body is large, so that the slag adhered on the outer wall of the oxygen lance is changed to fall off.

The technical solution of the present invention is further described in detail by the accompanying drawings and examples.

Drawings

FIG. 1 is a schematic view of an embodiment of a large-diameter oxygen lance for steelmaking according to the present invention;

FIG. 2 is a schematic view of an embodiment of a nozzle of the large-diameter oxygen lance for steelmaking according to the present invention.

Reference numerals

1. A body; 2. an oxygen lance inner pipe; 3. a spray head; 4. an oxygen inlet pipe; 5. a middle straight section; 6. a medium-diameter-reducing section; 7. a variable diameter section; 8. a water inlet pipe; 9. an outer straight section; 10. an outer taper section; 11. an outer reducer section; 12. a water outlet pipe; 13. an inner layer connecting pipe; 14. a middle layer connecting pipe; 15. an outer layer connecting pipe; 16. a water inlet cavity; 17. a water outlet cavity; 18. a water guide hole; 19. an airway; 20. a seal ring; 21. a gasket; 22. and (4) convex rings.

Detailed Description

The following describes embodiments of the present invention with reference to the accompanying drawings.

FIG. 1 is a schematic view of an embodiment of the large-diameter oxygen lance for steelmaking according to the present invention, and FIG. 2 is a schematic view of an embodiment of a nozzle in the large-diameter oxygen lance for steelmaking according to the present invention, and as shown in the figure, a large-diameter oxygen lance for steelmaking comprises a body 1, wherein the body 1 comprises an oxygen lance inner tube 2, an oxygen lance middle tube, an oxygen lance outer tube and a nozzle 3. The oxygen lance inner pipe 2 is a straight pipe, the oxygen lance inner pipe 2 is connected with the oxygen inlet pipe 4, and the oxygen lance inner pipe 2 is used for conveying oxygen into the furnace. The oxygen lance middle pipe comprises a middle straight section 5, a middle inverted reducing section 6 and a middle reducing section 7 which are sequentially connected, the top end of the middle straight section 5 is hermetically connected with the outer wall of the oxygen lance inner pipe 2, the top of the middle straight section 5 is connected with a water inlet pipe 8, and the water inlet pipe 8 can guide water into a cavity between the oxygen lance middle pipe and the oxygen lance inner pipe 2. The oxygen lance outer pipe comprises an outer straight section 9, an outer inverted reducing section 10 and an outer reducing section 11 which are sequentially connected, the top end of the outer straight section 9 is hermetically connected with the outer wall of the middle straight section 5, the top of the outer straight section 9 is connected with a water outlet pipe 12, and the water outlet pipe 12 is used for guiding out water in a cavity between the oxygen lance outer pipe and the oxygen lance middle pipe. The bottom of outer reducing section 11 is equipped with the recess, and the recess is located outer edge of outer reducing section 11, and the recess is used for conveniently being connected with shower nozzle 3.

The middle reducing section 6, the middle reducing section 7, the outer reducing section 10 and the outer reducing section 11 are seamless reducing pipes, the seamless reducing pipes can reduce welding seams, the safety of the oxygen lance is improved, the uniformity of gaps between the middle pipe of the oxygen lance and the outer pipe of the oxygen lance is improved, the maximum upper limit of bearing water flow and water flow speed is improved, and the heat dissipation effect is further improved. The conicity of the middle variable diameter section 7 and the outer variable diameter section 11 is 2.5-8 degrees, and the structural design of large conicity can lead the slag adhered on the outer wall of the oxygen lance to automatically fall off.

The nozzle 3 is of an integrated structure and comprises an inner layer connecting pipe 13, a middle layer connecting pipe 14 and an outer layer connecting pipe 15, a water inlet cavity 16 is formed between the inner layer connecting pipe 13 and the middle layer connecting pipe 14, and a water outlet cavity 17 is formed between the middle layer connecting pipe 14 and the outer layer connecting pipe 15. The middle part of the bottom end surface of the middle layer connecting pipe 14 is provided with a water guide hole 18, and the water guide hole 18 can enable water in the water inlet cavity 16 to flow into the water outlet cavity 17. A plurality of air passages 19 are arranged between the bottom end surface of the outer layer connecting pipe 15 and the bottom end surface of the inner layer connecting pipe 13, the air passages 19 penetrate through the middle layer connecting pipe 14, and the air passages 19 are used for guiding oxygen in the oxygen lance inner pipe 2 into the furnace. The upper port of the air passage 19 is close to the center line of the nozzle 3 relative to the lower port, and the blowing area during oxygen blowing is increased. The outer wall of the inner layer connecting pipe 13 is matched with the inner wall of the oxygen lance inner pipe 2, a sealing ring 20 is arranged on the outer wall of the inner layer connecting pipe 13, and the sealing ring 20 can increase the sealing performance when the inner layer connecting pipe 13 is connected with the oxygen lance inner pipe 2. The outer wall of the middle layer connecting pipe 14 is matched with the inner wall at the tail end of the middle reducing section 7, a sealing gasket 21 is arranged on the outer wall of the middle layer connecting pipe 14, the outer diameter size of the sealing gasket 21 is gradually increased from one end close to the middle reducing section 7 to one end far away from the middle reducing section 7, and the sealing performance of the middle layer connecting pipe 14 when being connected with the middle reducing section 7 can be improved through the sealing gasket 21. Outer connecting pipe 15 and the end welding of outer reducing section 11 are equipped with the structure assorted flange 22 with the recess on outer connecting pipe 15, and the leakproofness when flange 22 can increase outer connecting pipe 15 and outer reducing section 11 with the recess cooperation and be connected.

When the water cooling device is used, the water inlet pipe 8 and the water outlet pipe 12 can be connected with the cooling water tank, cooling water flows into a cavity between the oxygen lance middle pipe and the oxygen lance inner pipe 2 through the water inlet pipe 8 and then flows into the water inlet cavity 16 of the spray head 3, water in the water inlet cavity 16 flows into the water outlet cavity 17 through the water guide hole 18, water in the water outlet cavity 17 flows into the cavity between the oxygen lance outer pipe and the oxygen lance middle pipe, and finally flows back to the cooling water tank through the water outlet pipe 12 to form a circulating water path. The oxygen inlet pipe 4 can be connected with oxygen supply equipment, oxygen flows into the oxygen lance inner pipe 2 through the oxygen inlet pipe 4, and oxygen in the oxygen lance inner pipe 2 is sprayed into the furnace through the air passage 19 for converting.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the preferred embodiments, those skilled in the art should understand that: the technical solution of the present invention can still be modified or replaced by other equivalent means, and the modified technical solution can not be separated from the spirit and scope of the technical solution of the present invention.

Claims

1. A large reducing oxygen lance for steelmaking is characterized in that: the oxygen lance outer pipe comprises an outer straight section, an outer tapered section and an outer tapered section which are connected in sequence, the top end of the middle straight section is hermetically connected with the outer wall of the oxygen lance inner pipe, the top end of the outer straight section is hermetically connected with the outer wall of the middle straight section, the bottom end of the outer tapered section is provided with a groove, the groove is positioned on the outer edge of the outer tapered section, and the middle tapered section, the outer tapered section and the outer tapered section are seamless tapered pipes;

2. The large variable diameter oxygen lance for steelmaking as claimed in claim 1, wherein: the top of the outer straight section is connected with a water outlet pipe, the top of the middle straight section is connected with a water inlet pipe, and the inner pipe of the oxygen lance is connected with an oxygen inlet pipe.

3. The large variable diameter oxygen lance for steelmaking as claimed in claim 2, wherein: the outer diameter of the sealing gasket is gradually increased from one end close to the middle diameter section to one end far away from the middle diameter section.

4. The large variable diameter oxygen lance for steelmaking as claimed in claim 3, wherein: the taper of the inner diameter-changing section and the taper of the outer diameter-changing section are 2.5-8 degrees.