Double-Mach-number rotational flow oxygen lance nozzle with center enhanced oxygen supply

Abstract

A double-Mach-number rotational flow oxygen lance nozzle with center enhanced oxygen supply belongs to the technical field of oxygen lances and comprises a nozzle crown surface, a center oxygen supply hole and two groups of Laval holes, the two groups of Laval holes are uniformly arranged on the periphery of the center oxygen supply hole and are staggered 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. One group of Laval holes comprises a plurality of first Laval holes, the other group of Laval holes comprises a plurality of second Laval holes, the plurality of first Laval holes and the plurality of second Laval holes respectively penetrate out of the crown surface of the spray head to form a plurality of circular holes, the flow ratio of the first Laval holes is 50-70%, and the flow ratio of the second Laval holes is 30-50%. The central oxygen supply hole has the effects of quickly participating in stirring and enhancing the chemical reaction capacity of molten steel in the converter, the peripheral rotational flow spray holes can generate tangential speed when supplying oxygen, so that dead zones of the reaction in a molten pool are reduced, the central oxygen supply hole and the peripheral rotational flow spray holes have different Mach numbers, the reaction in the converter is more uniform, and meanwhile, the effects in the aspects of dephosphorization, vanadium extraction, carbon removal and the like are remarkable.

Description

Technical Field

[0001] The utility model relates to a double-Mach number swirl oxygen gun nozzle with central enhanced oxygen supply, belonging to the technical field of oxygen guns. Background Art

[0002] As one of the main equipment in converter steelmaking, the oxygen lance plays a decisive role in metallurgical effects such as molten pool stirring, slag making, and decarburization and heating. In the oxygen converter steelmaking process, high-pressure oxygen is blown into the molten pool in the form of a supersonic jet through a water-cooled oxygen lance to provide an oxidizing medium for reactions such as decarburization. At the same time, the high-speed oxygen jet impacts the metal molten pool with huge kinetic energy to cause a reaction.

[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 dual-Mach number swirl oxygen lance nozzle with central enhanced oxygen supply in view of the above shortcomings. The central oxygen supply hole has the function of quickly participating in stirring and enhancing the chemical reaction ability of molten steel in the converter. The oxygen supply of the peripheral swirl spray holes will produce tangential velocity, which reduces the dead zone of the reaction in the molten pool. The central oxygen supply hole and the peripheral swirl spray holes have different Mach numbers, and the reaction in the furnace is more uniform. At the same time, it has remarkable effects in dephosphorization, vanadium extraction, decarbonization, etc.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is as follows: a dual Mach number swirl oxygen gun nozzle with central enhanced oxygen supply, comprising a nozzle crown surface, a central oxygen supply hole and two groups of Laval holes, the two groups of Laval holes are evenly arranged on the periphery of the central oxygen supply hole, the two groups of Laval holes are staggered and arranged, one group of Laval holes includes a plurality of first Laval holes, 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 flow rate of the first Laval holes accounts for 50-70%, and the flow rate of the second Laval holes accounts for 30-50%.

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

[0007] The Mach number of the central oxygen supply hole is 1.95-2.20, and the Mach number of the two groups of Laval holes is 1.90-2.10.

[0008] The central axis of the first Laval hole does not intersect with the central line of the oxygen lance nozzle, and the angle between the central axis of the first Laval hole and the central line of the oxygen lance nozzle is 6-20°.

[0009] 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°.

[0010] The central axis of the second Laval hole does not intersect the central line of the oxygen lance nozzle, and the angle between the central axis of the second Laval hole and the central line of the oxygen lance nozzle is 6-20°.

[0011] 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 nozzle crown surface, and the plane where the center line of the oxygen lance nozzle is located is 0.1-20.0°.

[0012] The utility model adopts the above technical scheme and has the following advantages: the central oxygen supply hole of the utility model has the function of quickly participating in stirring and strengthening the chemical reaction ability of the molten steel in the converter, the oxygen supply of the peripheral swirl spray holes will produce a tangential velocity, so that the reaction in the molten pool reduces the dead zone, the central oxygen supply hole and the peripheral swirl spray holes have different Mach numbers, the reaction in the furnace is more uniform, and at the same time, it has remarkable effects in dephosphorization, vanadium extraction, decarbonization, etc.; 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.

[0013] The utility model is further described below in conjunction with the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of a dual Mach number swirl oxygen lance nozzle with central enhanced oxygen supply in an embodiment of the utility model;

[0015] Figure 2 yes Figure 1 Schematic diagram of the cross-sectional structure along the AA direction;

[0016] Figure 3 yes Figure 1 Top view of the .

[0017] In the figure,

[0018] 1- crown surface of the nozzle, 2- first Laval hole, 3- second Laval hole, 4- central oxygen supply hole. DETAILED DESCRIPTION

[0019] 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.

[0020] 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.

[0021] 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

[0022] like Figure 1-3 As shown, a dual Mach number swirl oxygen lance nozzle with central enhanced oxygen supply includes a nozzle crown surface 1, a central oxygen supply hole 4 and two groups of Laval holes, the two groups of Laval holes are evenly arranged on the periphery of the central oxygen supply hole 4, the two groups of Laval holes are staggered and spaced, one group of Laval holes includes a plurality of first Laval holes 2, and the other group of Laval holes includes 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, the flow rate of the first Laval holes 2 accounts for 50-70%, and the flow rate of the second Laval holes 3 accounts for 30-50%.

[0023] The Mach number of the central oxygen supply hole 4 is 1.95-2.20, and the Mach number of the two groups of Laval holes is 1.90-2.10.

[0024] 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°.

[0025] 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°.

[0026] The angle between the central axis of the first Laval hole 2 and the central line of the oxygen lance nozzle is small, and the flow rate accounts for a large proportion. The local large flow rate, high pressure and strong impact force can accelerate the reaction of the molten steel in the furnace, and can improve the stirring force of the molten steel, so as to achieve the effect of rapid slag formation and reduce the smelting time.

[0027] 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, 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 capacity.

[0028] The central oxygen supply hole 4 of the utility model has the function of quickly participating in stirring and strengthening the chemical reaction ability of the molten steel in the converter. The oxygen supply of the peripheral swirl spray holes will produce a tangential velocity, which reduces the dead zone of the reaction in the molten pool. The central oxygen supply hole and the peripheral swirl spray holes have different Mach numbers, and the reaction in the furnace is more uniform. At the same time, it has remarkable effects in dephosphorization, vanadium extraction, and decarbonization. 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.

[0029] 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 dual Mach number swirl oxygen lance nozzle with central enhanced oxygen supply, characterized in that: The invention comprises a nozzle crown surface (1), a central oxygen supply hole (4) and two groups of Laval holes, wherein the two groups of Laval holes are evenly arranged on the periphery of the central oxygen supply hole (4), and the two groups of Laval holes are arranged at staggered intervals, 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), and 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 flow rate of the first Laval holes (2) accounts for 50-70%, and the flow rate of the second Laval holes (3) accounts for 30-50%.

2. The dual Mach number swirl oxygen lance nozzle with central enhanced oxygen supply according to claim 1, characterized in that: The Mach number of the central oxygen supply hole (4) is 1.95-2.20, and the Mach number of the two groups of Laval holes is 1.90-2.

10.

3. The dual Mach number swirl oxygen lance nozzle with central enhanced oxygen supply according to claim 1, characterized in that: 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°.

4. The dual Mach number swirl oxygen lance nozzle with central enhanced oxygen supply according to claim 2, 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°.

5. The dual Mach number swirl oxygen lance nozzle with central enhanced oxygen supply according to claim 1, characterized in that: 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°.

6. A dual Mach number swirl oxygen lance nozzle with central enhanced oxygen supply according to claim 5, 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°.

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