Efficient Laval hole oxygen lance nozzle for converter steelmaking

Abstract

The utility model relates to an efficient Laval hole oxygen lance nozzle for converter steelmaking, which belongs to the technical field of oxygen lances, and comprises a plurality of Laval holes, the plurality of Laval holes are uniformly distributed on the same circumference, each Laval hole comprises a contraction section, a throat opening and an expansion section, the contraction section is an arc-shaped hole which is gradually reduced from top to bottom, and the throat opening is communicated with the expansion section. The expansion section is an arc-shaped hole which is gradually expanded from top to bottom, the arc-shaped hole is bent towards the interior of the Laval hole, the expansion section is an arc-shaped hole which is gradually expanded from top to bottom, the arc-shaped hole is bent towards the exterior of the Laval hole, the whole Laval hole is an arc-shaped hole which is tangent and connected from the contraction section to the throat opening and then to the expansion section, and the throat opening is the joint of the contraction section and the expansion section. According to the utility model, the stirring capacity of the oxygen stream to the molten steel is effectively ensured, the steelmaking blowing time can be effectively shortened by 1-3 minutes, the oxygen consumption of single-furnace steel smelting is reduced by 3-5%, the power consumption and the water consumption of single-furnace steel smelting are reduced, the iron consumption of single-furnace steel smelting is reduced, and the metal yield is improved.

Description

Technical Field

[0001] The utility model relates to a high-efficiency Laval hole oxygen lance nozzle for converter steelmaking, belonging to the technical field of oxygen lances. Background Art

[0002] In the oxygen supply equipment of oxygen top-blown converter steelmaking, the nozzle is the core part of the oxygen lance. At present, the oxygen lance nozzle used in converter steelmaking is as follows Figure 2 As shown, it includes a plurality of Laval holes 1, which are evenly distributed on the same circumference. The Laval hole 1 includes a contraction section 2, a throat 3 and an expansion section 4. The contraction section 2 is a tapered hole that gradually shrinks from top to bottom, the throat 3 is a cylindrical hole concentric with the central axis of the Laval hole 1, and the expansion section 4 is a tapered hole that gradually expands from top to bottom. The current oxygen lance nozzle oxygen has insufficient stirring force on the molten steel in the furnace, resulting in long blowing time, low efficiency, and high oxygen, electricity and water consumption. Summary of the invention

[0003] The technical problem to be solved by the utility model is to provide a high-efficiency Laval hole oxygen lance nozzle for converter steelmaking in view of the above shortcomings, which effectively ensures the stirring ability of the oxygen stream on the molten steel, can effectively shorten the steelmaking blowing time by 1-3 minutes, reduce the oxygen consumption of single-furnace steel smelting by 3-5%, reduce the power and water consumption of single-furnace steel smelting, reduce the iron consumption of single-furnace steel smelting, and improve the metal recovery rate.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is as follows: a high-efficiency Laval hole oxygen lance nozzle for converter steelmaking, including a plurality of Laval holes, the plurality of Laval holes are evenly distributed on the same circumference, the Laval hole includes a contraction section, a throat and an expansion section, the contraction section is an arc-shaped hole that gradually shrinks from top to bottom, and the arc-shaped hole bends toward the inside of the Laval hole, the expansion section is an arc-shaped hole that gradually expands from top to bottom, and the arc-shaped hole bends toward the outside of the Laval hole, the entire Laval hole from the contraction section to the throat and then to the expansion section is an arc-shaped hole that is tangent to each other, and the throat is the junction of the contraction section and the expansion section.

[0005] As a further improvement of the above technical solution:

[0006] The angle between the connecting line of the throat and the cross section where the end of the expansion section is located and the central axis of the high-efficiency Laval hole oxygen lance nozzle for converter steelmaking is 2-5 degrees.

[0007] The angle between the Laval hole and the central axis of the high-efficiency Laval hole oxygen lance nozzle for converter steelmaking is 9.5-15.5°.

[0008] The high-efficiency Laval hole oxygen lance nozzle for converter steelmaking has an end face, which includes a central end face and a peripheral end face, and a plurality of Laval holes respectively penetrate the peripheral end face.

[0009] The angle between the plane where the central end face is located and the plane where the peripheral end face is located is 9.5-15.5°.

[0010] The high-efficiency Laval hole oxygen lance nozzle for converter steelmaking is respectively connected with an inner pipe, a middle pipe and an outer pipe.

[0011] The utility model adopts the above technical scheme and has the following advantages: the setting of the Laval hole of the utility model minimizes the oxygen pressure loss, can effectively convert the oxygen pressure potential energy into gas kinetic energy, more effectively ensure the stirring ability of the oxygen stream on the molten steel, can effectively shorten the steelmaking blowing time by 1-3 minutes, reduce the oxygen consumption of single-furnace steel smelting by 3-5%, reduce the power consumption and water consumption of single-furnace steel smelting, reduce the iron consumption of single-furnace steel smelting, and improve the metal recovery rate.

[0012] The utility model is further described below in conjunction with the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of a high-efficiency Laval hole oxygen lance nozzle for converter steelmaking in an embodiment of the utility model;

[0014] Figure 2 It is a structural schematic diagram of an oxygen lance nozzle in the background technology.

[0015] In the figure,

[0016] 1-Laval hole, 2-contraction section, 3-throat, 4-expansion section, 6-end face, 7-center end face, 8-outer end face, 9-inner pipe, 10-middle pipe, 11-outer pipe. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0019] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined. Example

[0020] like Figure 1 As shown, a high-efficiency Laval hole oxygen lance nozzle for converter steelmaking comprises a plurality of Laval holes 1, which are evenly distributed on the same circumference, and the angle between the Laval holes 1 and the central axis of the high-efficiency Laval hole oxygen lance nozzle for converter steelmaking is 9.5-15.5°. The Laval hole 1 comprises a contraction section 2, a throat 3 and an expansion section 4, the contraction section 2 is an arc-shaped hole that gradually shrinks from top to bottom, and the arc-shaped hole bends toward the inside of the Laval hole 1, the expansion section 4 is an arc-shaped hole that gradually expands from top to bottom, and the arc-shaped hole bends toward the outside of the Laval hole 1, the entire Laval hole is an arc-shaped hole that is tangent to each other from the contraction section to the throat and then to the expansion section, the throat 3 is the intersection of the contraction section 2 and the expansion section 4, and the angle between the line connecting the cross section where the throat 3 and the end of the expansion section 4 are located and the central axis of the high-efficiency Laval hole oxygen lance nozzle for converter steelmaking is 2-5°.

[0021] The high-efficiency Laval hole oxygen lance nozzle for converter steelmaking has an end face 6, which includes a central end face 7 and a peripheral end face 8. A plurality of Laval holes 1 respectively pass through the peripheral end face 8, and the angle between the plane where the central end face 7 and the plane where the peripheral end face 8 are located is 9.5-15.5°.

[0022] The high-efficiency Laval hole oxygen lance nozzle for converter steelmaking is respectively connected to the inner pipe 9, the middle pipe 10 and the outer pipe 11. The blowing oxygen enters the Laval hole 1 from the inner pipe 9, and is ejected to the high-temperature molten steel after the jet is accelerated. The cooling water enters the oxygen lance nozzle from the middle pipe 10 to cool it and then flows out from the outer pipe 11.

[0023] The setting of the Laval hole 1 of the utility model minimizes the oxygen pressure loss, can effectively convert the oxygen pressure potential energy into gas kinetic energy, more effectively ensure the stirring ability of the oxygen stream on the molten steel, can effectively shorten the steelmaking blowing time by 1-3 minutes, reduce the oxygen consumption of single-furnace steel smelting by 3-5%, reduce the power consumption and water consumption of single-furnace steel smelting, reduce the iron consumption of single-furnace steel smelting, and improve the metal recovery rate.

[0024] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-efficiency Laval hole oxygen lance nozzle for converter steelmaking, characterized in that: The invention comprises a plurality of Laval holes (1), wherein the plurality of Laval holes (1) are evenly distributed on the same circumference, the Laval hole (1) comprises a contraction section (2), a throat (3) and an expansion section (4), the contraction section (2) is an arc-shaped hole that gradually contracts from top to bottom, and the arc-shaped hole bends toward the inside of the Laval hole (1), the expansion section (4) is an arc-shaped hole that gradually expands from top to bottom, and the arc-shaped hole bends toward the outside of the Laval hole (1), and the throat (3) is the junction of the contraction section (2) and the expansion section (4).

2. The high-efficiency Laval hole oxygen lance nozzle for converter steelmaking according to claim 1, characterized in that: The angle between the line connecting the throat (3) and the cross section where the end of the expansion section (4) is located and the central axis of the high-efficiency Laval orifice oxygen lance nozzle for converter steelmaking is 2-5°.

3. The high-efficiency Laval hole oxygen lance nozzle for converter steelmaking according to claim 2, characterized in that: The angle between the Laval hole (1) and the central axis of the high-efficiency Laval hole oxygen lance nozzle for converter steelmaking is 9.5-15.5°.

4. The high-efficiency Laval hole oxygen lance nozzle for converter steelmaking according to claim 3, characterized in that: The high-efficiency Laval hole oxygen lance nozzle for converter steelmaking has an end face (6), the end face (6) includes a central end face (7) and a peripheral end face (8), and a plurality of Laval holes (1) respectively penetrate the peripheral end face (8).

5. The high-efficiency Laval hole oxygen lance nozzle for converter steelmaking according to claim 4, characterized in that: The angle between the plane where the central end face (7) is located and the plane where the peripheral end face (8) is located is 9.5-15.5°.

6. The high-efficiency Laval hole oxygen lance nozzle for converter steelmaking according to claim 5, characterized in that: The high-efficiency Laval hole oxygen lance nozzle for converter steelmaking is respectively connected to an inner pipe (9), a middle pipe (10) and an outer pipe (11).

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