Staggered double-rotation-inclination-angle multi-flow type rotational flow oxygen lance nozzle

Abstract

The utility model relates to a staggered double-rotation dip angle multi-flow type rotational flow oxygen lance nozzle, which belongs to the technical field of oxygen lances and comprises a nozzle crown surface and two groups of Laval holes, the two groups of Laval holes are staggered and arranged at intervals, one group of Laval holes comprises a plurality of first Laval holes, and the other group of Laval holes comprises a plurality of second Laval holes. A plurality of first Laval holes and a plurality of second Laval holes respectively penetrate out of the crown surface of the spray head to form a plurality of circular holes, the included angle between the central axis of each first Laval hole and the central line of the spray head of the oxygen lance is 6-20 degrees, and the included angle between the central axis of each second Laval hole and the central line of the spray head of the oxygen lance is 6-20 degrees. Horizontal rotating motion of the molten pool is accelerated, stirring of the molten pool is enhanced, slagging and metallurgical reaction are promoted, oxygen blowing time is shortened, the dephosphorization rate is increased, the splashing rate is reduced, and the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to a staggered double-rotation-angle multi-flow swirl oxygen lance nozzle, belonging to the technical field of oxygen lances. Background Art

[0002] As one of the main equipment for converter steelmaking, the oxygen lance plays a decisive role in metallurgical effects such as molten pool stirring, slag making, and decarburization and heating. Supersonic oxygen streams are ejected from the oxygen lance nozzle, impacting the metal molten pool through high-temperature furnace gas and slag, causing violent stirring of the metal liquid in the molten pool, completing tasks such as slag making, decarburization, dephosphorization, desulfurization, degassing, and removal of inclusions, directly affecting the smelting effect, and indirectly affecting the quality of molten steel and production costs; different oxygen lance nozzle parameters directly affect the injection state of supersonic streams, and the angle between the nozzle centerline and the nozzle hole axis directly affects the streams, the impact depth and impact area of ​​the metal molten pool. Generally speaking, the angle increases, the impact area of ​​the spray increases, the impact depth decreases, and there is a risk of scouring the furnace lining; the angle decreases, the impact area of ​​the spray decreases, the impact depth increases, and there is a risk of impacting the furnace bottom, and the mutual suction and entrainment ability of each jet is enhanced.

[0003] In traditional multi-hole oxygen lances, the center of each nozzle gradually deviates from the nozzle axis. As the jets advance, they form a curve on the plane formed by the nozzle axis and the nozzle axis, converge toward the nozzle axis, and eventually converge. This behavior is called jet convergence. This behavior brings the oxygen jets together, reducing the penetration of the oxygen jets. The mutual influence between different oxygen jets accelerates the attenuation rate of the oxygen jets, thereby reducing the area of ​​the impact crater formed, affecting the rapid slag reduction effect in the early stage and increasing the oxygen blowing time and oxygen consumption. Under different flow rates and fixed lance height, the traditional oxygen lance forms a deep and complete cavity. The molten steel stirring force of this cavity is weak, the slag reduction effect is poor, and because of its large cavity penetration, it is difficult to operate on site, and it is easy to erode the furnace bottom and affect production. Summary of the invention

[0004] The technical problem to be solved by the utility model is to provide a staggered double-rotating inclination multi-flow swirl oxygen lance nozzle in view of the above shortcomings. The oxygen supply will generate tangential velocity, accelerate the horizontal rotation movement of the molten pool, strengthen the stirring of the molten pool, promote slag and metallurgical reaction, shorten the oxygen blowing time, improve the dephosphorization rate, reduce the splashing rate, and increase the service life.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is as follows: a staggered double-rotation-angle multi-flow swirl oxygen lance nozzle, comprising a nozzle crown surface and two groups of Laval holes, the two groups of Laval holes are staggered and spaced, one group of Laval holes includes a plurality of first Laval holes, and the other group of Laval holes includes a plurality of second Laval holes, the plurality of first Laval holes and the plurality of second Laval holes respectively pass through the nozzle crown surface to form a plurality of circular holes, the central axis of the first Laval hole does not intersect with the center line of the oxygen lance nozzle, the angle between the central axis of the first Laval hole and the center line of the oxygen lance nozzle is 6-20°, the central axis of the second Laval hole does not intersect with the center line of the oxygen lance nozzle, and the angle between the central axis of the second Laval hole and the center line of the oxygen lance nozzle is 6-20°.

[0006] As a further improvement of the above technical solution:

[0007] The angle between the central axis of the first Laval hole, the center of the circular hole formed by the first Laval hole passing through the nozzle crown surface, and the plane where the center line of the oxygen lance nozzle is located is 0.1-20.0°.

[0008] The flow rate of the first Laval hole accounts for 50-70%.

[0009] The angle between the central axis of the second Laval hole, the center of the circular hole formed by the second Laval hole passing through the crown surface of the nozzle, and the plane where the center line of the oxygen lance nozzle is located is 0.1-20.0°.

[0010] The flow rate of the second Laval hole accounts for 30-50%.

[0011] The utility model adopts the above technical scheme and has the following advantages: the oxygen supply of the utility model will generate tangential velocity, accelerate the horizontal rotation movement of the molten pool, strengthen the stirring of the molten pool, promote slag removal and metallurgical reaction, shorten the oxygen blowing time, improve the dephosphorization rate, reduce the splashing rate, and improve the service life; under different flow rates and a fixed spray gun height, the cavity formed by the utility model is dispersed and alternately arranged in depth and shallowness, which significantly enhances the stirring force of the nozzle on the molten steel, and significantly improves the early slag removal effect and furnace bottom erosion.

[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 staggered double-rotation angle multi-flow swirl oxygen lance nozzle in an embodiment of the utility model;

[0014] Figure 2 yes Figure 1 Schematic diagram of the cross-sectional structure in the CC direction;

[0015] Figure 3yes Figure 1 Schematic diagram of the structure in the middle B direction;

[0016] Figure 4 yes Figure 1 The structural diagram of the middle A direction;

[0017] Figure 5 yes Figure 4 Schematic diagram of the cross-sectional structure in the middle DD direction;

[0018] Figure 6 yes Figure 1 Schematic diagram of the structure in the E direction.

[0019] In the figure,

[0020] 1- crown surface of nozzle, 2- first Laval hole, 3- second Laval hole. DETAILED DESCRIPTION

[0021] 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.

[0022] 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.

[0023] 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

[0024] like Figure 1-6As shown, a staggered double-rotation-angle multi-flow swirl oxygen lance nozzle comprises a nozzle crown surface 1 and two groups of Laval holes, the two groups of Laval holes are arranged at staggered intervals, one group of Laval holes comprises a plurality of first Laval holes 2, and the other group of Laval holes comprises a plurality of second Laval holes 3, the plurality of first Laval holes 2 and the plurality of second Laval holes 3 respectively pass through the nozzle crown surface 1 to form a plurality of circular holes.

[0025] The central axis of the first Laval hole 2 does not intersect with the center line of the oxygen lance nozzle, and the angle between the central axis of the first Laval hole 2 and the center line of the oxygen lance nozzle is 6-20°. The angle between the central axis of the first Laval hole 2 and the center of the circular hole formed by the first Laval hole 2 passing through the nozzle crown surface 1 and the plane where the center line of the oxygen lance nozzle is located is 0.1-20.0°, and the flow rate of the first Laval hole 2 accounts for 50-70%.

[0026] The central axis of the second Laval hole 3 does not intersect with the center line of the oxygen lance nozzle, and the angle between the central axis of the second Laval hole 3 and the center line of the oxygen lance nozzle is 6-20°. The angle between the central axis of the second Laval hole 3 and the center of the circular hole formed by the second Laval hole 3 passing through the nozzle crown surface 1 and the plane where the center line of the oxygen lance nozzle is located is 0.1-20.0°, and the flow rate of the second Laval hole 3 accounts for 30-50%.

[0027] The angle between the central axis of the first Laval hole 2 and the center line of the oxygen lance nozzle is small, and the flow rate accounts for a large proportion (50%-70%). The reaction of molten steel in the furnace can be accelerated through local large flow, high pressure and strong impact force. The angle between the central axis of the first Laval hole 2 and the center of the circular hole formed by the first Laval hole 2 passing through the nozzle crown surface 1 and the plane where the center line of the oxygen lance nozzle is located is 0.1-20.0°, which can improve the stirring force on the molten steel and achieve the effect of rapid slag formation and reduced smelting time.

[0028] The angle between the central axis of the second Laval hole 3 and the center line of the oxygen lance nozzle is greater than that of the first Laval hole 2. The flow rate of the second Laval hole 3 accounts for a small proportion (30-50%), and the angle between the central axis of the second Laval hole 3 and the center of the circular hole formed by the second Laval hole 3 passing through the nozzle crown surface 1 and the plane where the center line of the oxygen lance nozzle is located is 0.1-20.0°, which can provide a larger stirring range for the nozzle, shorten the mixing time of the molten pool, further reduce oxygen consumption, smelting time and improve slag-forming ability.

[0029] Oxygen for blowing enters two groups of Laval holes from the oxygen tube in the oxygen lance, and is ejected toward the high-temperature molten steel after jet acceleration. The arrangement of the two groups of Laval holes in the utility model accelerates the horizontal rotation movement of the molten pool, strengthens the stirring of the molten pool, promotes slag removal and metallurgical reaction, shortens the oxygen blowing time, improves the dephosphorization rate, reduces the splashing rate, and improves the service life.

[0030] 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 staggered double-rotation angle multi-flow swirl oxygen lance nozzle, characterized in that: The invention comprises a nozzle crown surface (1) and two groups of Laval holes, wherein the two groups of Laval holes are arranged in a staggered manner, wherein one group of Laval holes comprises a plurality of first Laval holes (2), and the other group of Laval holes comprises a plurality of second Laval holes (3), wherein the plurality of first Laval holes (2) and the plurality of second Laval holes (3) respectively penetrate the nozzle crown surface (1) to form a plurality of circular holes, wherein the central axis of the first Laval hole (2) does not intersect with the central line of the oxygen lance nozzle, and the angle between the central axis of the first Laval hole (2) and the central line of the oxygen lance nozzle is 6-20°, and the central axis of the second Laval hole (3) does not intersect with the central line of the oxygen lance nozzle, and the angle between the central axis of the second Laval hole (3) and the central line of the oxygen lance nozzle is 6-20°.

2. The staggered double-rotation angle multi-flow swirl oxygen lance nozzle according to claim 1, characterized in that: The angle between the central axis of the first Laval hole (2), the center of the circular hole formed by the first Laval hole (2) passing through the nozzle crown surface (1), and the plane where the center line of the oxygen lance nozzle is located is 0.1-20.0°.

3. The staggered double-rotation angle multi-flow swirl oxygen lance nozzle according to claim 1 or 2, characterized in that: The flow rate of the first Laval hole (2) accounts for 50-70%.

4. The staggered double-rotation angle multi-flow swirl oxygen lance nozzle according to claim 1, characterized in that: The angle between the central axis of the second Laval hole (3), the center of the circular hole formed by the second Laval hole (3) passing through the nozzle crown surface (1), and the plane where the center line of the oxygen lance nozzle is located is 0.1-20.0°.

5. The staggered double-rotation angle multi-flow swirl oxygen lance nozzle according to claim 1 or 4, characterized in that: The flow rate of the second Laval hole (3) accounts for 30-50%.

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