Anti-reaming long-life oxygen lance nozzle for converter steelmaking

Abstract

The utility model relates to an anti-chambering long-life oxygen lance nozzle for converter steelmaking, which belongs to the technical field of oxygen lances and comprises a plurality of Laval holes, the Laval holes are uniformly distributed on the same circumference, each Laval hole comprises a contraction section, a throat, an expansion section and an outlet section, the circumference of each outlet section is in a circular arc shape, the radius of each circular arc is 3-25mm, and the diameter of each expansion section is 3-25mm. According to the utility model, the scouring in the high-pressure oxygen expansion process can be reduced, the expansion and contraction of gas can be favorably maintained by the spray hole, the edge of the outlet position of the Laval hole is protected from being damaged or reduced, and the service life of the Laval hole is prolonged by 30-50%.

Description

Technical Field

[0001] The utility model relates to an anti-hole expansion and high-life 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, and the plurality of Laval holes 1 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 expansion section 4 is a tapered hole that gradually expands from top to bottom. Affected by the thermal radiation of molten steel and the erosion of the high-pressure oxygen expansion process, it is easy to cause serious edge wear at the outlet position of the Laval hole expansion section 4, that is, serious hole expansion, and water leakage problems may occur in severe cases. In addition, serious edge wear at the outlet position will lead to unstable changes in nozzle parameters, jet divergence, and affect oxygen utilization. Summary of the invention

[0003] The technical problem to be solved by the utility model is to provide an anti-expansion and long-life oxygen lance nozzle for converter steelmaking in view of the above shortcomings, which can reduce the scouring during the expansion process of high-pressure oxygen, is conducive to the expansion of the nozzle hole to maintain the gas, protect the edge of the Laval hole outlet from or reduce wear and erosion, and extend its service life by 30-50%.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is as follows: an anti-expansion and long-life oxygen lance nozzle for converter steelmaking, comprising a plurality of Laval holes, the plurality of Laval holes being evenly distributed on the same circumference, the Laval holes comprising a contraction section, a throat, an expansion section and an outlet section, the circumference of the outlet section being an arc shape, and the radius of the arc shape being 3-25 mm.

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

[0006] The length of the outlet section is 3-25 mm.

[0007] The contraction section is a tapered hole that gradually shrinks from top to bottom.

[0008] The throat is a cylindrical hole concentric with the center axis of the Laval hole.

[0009] The expansion section is a tapered hole that gradually expands from top to bottom.

[0010] The angle between the Laval hole and the central axis of the anti-hole expansion and long-life oxygen lance nozzle for converter steelmaking is 9.5-15.5°.

[0011] The anti-hole expansion and long-life 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.

[0012] 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°.

[0013] The anti-expansion hole and long-life oxygen lance nozzle for converter steelmaking is respectively connected with an inner pipe, a middle pipe and an outer pipe.

[0014] The utility model adopts the above technical scheme and has the following advantages: the setting of the Laval hole outlet section of the utility model can reduce the scouring during the expansion process of high-pressure oxygen, which is beneficial to the expansion of the nozzle hole to maintain the gas, protect the edge of the Laval hole outlet position from or reduce wear and erosion, and extend its service life by 30-50%.

[0015] The utility model is further described below in conjunction with the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic structural diagram of an anti-hole expansion and long-life oxygen lance nozzle for converter steelmaking in Example 1 of the utility model;

[0017] Figure 2 It is a structural schematic diagram of an oxygen lance nozzle in the background technology.

[0018] In the figure,

[0019] 1-Laval hole, 2-contraction section, 3-throat, 4-expansion section, 5-exit section, 6-end face, 7-center end face, 8-outer end face, 9-inner pipe, 10-middle pipe, 11-outer pipe. DETAILED DESCRIPTION

[0020] 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.

[0021] 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.

[0022] 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

[0023] like Figure 1 As shown, an anti-expansion and long-life 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 anti-expansion and long-life oxygen lance nozzle for converter steelmaking is 9.5-15.5°. The Laval hole 1 comprises a contraction section 2, a throat 3, an expansion section 4 and an outlet section 5, 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, the expansion section 4 is a tapered hole that gradually expands from top to bottom, the circumference of the outlet section 5 is an arc, the radius of the arc is 3-25 mm, and the length of the outlet section 5 is 3-25 mm.

[0024] The anti-expansion long-life 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 penetrate 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°.

[0025] The anti-expansion and long-life 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 acceleration is completed. 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.

[0026] The arrangement of the Laval hole outlet section of the utility model can reduce the scouring during the expansion process of high-pressure oxygen, is conducive to the expansion of the nozzle hole to maintain the gas, protects the edge of the Laval hole outlet position from or reduces wear and erosion, and prolongs its service life by 30-50%.

[0027] 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. An anti-hole expansion and long-life oxygen lance nozzle for converter steelmaking, characterized by: 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 holes (1) comprising a contraction section (2), a throat (3), an expansion section (4) and an outlet section (5), and the circumference of the outlet section (5) is in an arc shape, and the radius of the arc shape is 3-25 mm.

2. The anti-hole expansion and long-life oxygen lance nozzle for converter steelmaking according to claim 1, characterized in that: The length of the outlet section (5) is 3-25 mm.

3. The anti-hole expansion and long-life oxygen lance nozzle for converter steelmaking according to claim 2, characterized in that: The contraction section (2) is a tapered hole that gradually shrinks from top to bottom.

4. The anti-hole expansion and long-life oxygen lance nozzle for converter steelmaking according to claim 3, characterized in that: The throat (3) is a cylindrical hole that is concentric with the central axis of the Laval hole.

5. The anti-hole expansion and long-life oxygen lance nozzle for converter steelmaking according to claim 4, characterized in that: The expansion section (4) is a tapered hole that gradually expands from top to bottom.

6. The anti-hole expansion and long-life oxygen lance nozzle for converter steelmaking according to claim 5, characterized in that: The angle between the Laval hole (1) and the central axis of the anti-hole expansion and long-life oxygen lance nozzle for converter steelmaking is 9.5-15.5°.

7. The anti-hole expansion and long-life oxygen lance nozzle for converter steelmaking according to claim 6, characterized in that: The anti-hole expansion and long-life 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).

8. The anti-hole expansion and long-life oxygen lance nozzle for converter steelmaking according to claim 7, 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°.

9. The anti-hole expansion and long-life oxygen lance nozzle for converter steelmaking according to claim 8, characterized in that: The anti-expansion long-life oxygen lance nozzle for converter steelmaking is respectively connected to an inner pipe (9), a middle pipe (10) and an outer pipe (11).

Images