Double-angle heterocentric efficient blowing oxygen lance nozzle

Abstract

The utility model relates to a double-angle heterocentric high-efficiency blowing oxygen lance nozzle which comprises a nozzle, an outer pipe, a middle pipe and an oxygen pipe, the nozzle is integrally formed and provided with a nozzle upper part, a nozzle head crown, an oxygen column connected between the nozzle upper part and the nozzle head crown, and a water baffle integrally connected with the oxygen column; three groups of oxygen columns are arranged on different concentric circles in a heterocentric staggered manner, the angle between the first group of oxygen columns and the center line is 8-10 degrees, and the angles between the second group of oxygen columns and the third group of oxygen columns and the center line are 14-16 degrees; the diameter of a circle where the first group of oxygen columns are located is smaller than that of a circle where the second group of oxygen columns are located, and the diameter of the circle where the first group of oxygen columns are located is larger than that of a circle where the third group of oxygen columns are located. Through different changes of the number of the oxygen columns, the inlet area, the throat area, the outlet area, the diameter of the circle where each oxygen column is located and the included angle between the center line of each oxygen column and the center line of the spray head, the impact depth is improved and the stirring effect is enhanced under the condition that a certain impact area is guaranteed.

Description

Technical Field

[0001] This utility model belongs to the field of metallurgy and steelmaking, and particularly relates to a dual-angle heterocentric high-efficiency oxygen lance nozzle for blowing. Background Technology

[0002] Converter steelmaking is the main process in steel production, accounting for approximately 90% of my country's total steel output. The oxygen lance in the converter steelmaking process is one of the most crucial pieces of equipment. Its performance and lifespan determine the efficiency, quality, and economic benefits of steelmaking.

[0003] Modern steelmaking technology uses a rationally designed oxygen lance nozzle. The oxygen jet is ejected from the oxygen lance nozzle at a certain angle. Before reaching the surface of the molten steel, the jet velocity and dynamic pressure continuously decrease. Finally, the jet enters the interior of the molten pool, stirring the molten steel to complete the steel smelting.

[0004] By changing the arrangement, flow ratio, tilt angle, outlet center distance, and other design parameters, as well as the operating pressure and smelting lance position, the oxygen lance jet can achieve good independence and dynamic conditions, thus playing a role in heating, decarburizing, and dephosphorizing the molten steel in the converter.

[0005] Traditional oxygen lance nozzle arrangements with equal flow rate and equal tilt angle have significant limitations in improving oxygen lance smelting efficiency. Currently, domestic steel enterprises mainly face problems such as low oxygen supply intensity, long blowing time, difficulty in slag formation, low dephosphorization rate, and easy splashing. Dual-flow rate and dual-angle oxygen lance nozzles have great potential to improve the economic benefits of smelting.

[0006] The current status of relevant patents and publicly available technical literature regarding dual-angle, dual-flow nozzles is as follows:

[0007] Patent CN 201908105U describes "a dual-angle dual-flow 6-hole oxygen lance nozzle". The dual-angle design concept can increase the blowing area, but the blowing area is also affected by the specific size of the nozzle. However, this patent does not consider the impact of the size change of the dual nozzle on the blowing area.

[0008] Patent CN 216337769 U describes "a multi-hole oxygen lance nozzle with dual angles and multiple flow rates". This patent divides the nozzle into two groups and arranges them in an alternating manner, and designs its oxygen flow rate and included angle respectively to form multiple supersonic oxygen jets with different angles and flow rates and cross arrangement, which expands the impact area of ​​oxygen on the molten pool. However, the multiple jets may cross prematurely, which affects the stirring effect. Utility Model Content

[0009] To address the above problems, this utility model provides a dual-angle heterocentric high-efficiency oxygen lance nozzle. By varying the number of oxygen columns, inlet area, throat area, outlet area, diameter of the circle where each oxygen column is located, and the angle between the centerline of the oxygen column and the centerline of the nozzle, the impact depth is increased and the stirring effect is enhanced while ensuring a certain impact area.

[0010] To achieve the above objectives, the present invention adopts the following technical solution:

[0011] A dual-angle heterocentric high-efficiency oxygen lance nozzle includes a nozzle, an outer tube, a middle tube, and an oxygen tube. The nozzle is integrally formed with an upper part of the nozzle, a nozzle crown, an oxygen column connected between the upper part of the nozzle and the nozzle crown, and a baffle plate integrally connected to the oxygen column. The oxygen tube is connected to the upper part of the nozzle, the outer tube is connected to the nozzle crown, the middle tube is disposed between the outer tube and the oxygen tube, and the baffle plate is connected to the middle tube. Three sets of oxygen columns are arranged heterocentrically on different concentric circles. The angle between the first set of oxygen columns and the center line is 8° to 10°, and the angles between the second and third sets of oxygen columns and the center line are 14° to 16°. The diameter of the circle containing the first set of oxygen columns is smaller than the diameter of the circle containing the second set of oxygen columns, and the diameter of the circle containing the first set of oxygen columns is larger than the diameter of the circle containing the third set of oxygen columns.

[0012] The nozzle diameter is 355mm or more.

[0013] The inlet diameter of the first group of oxygen columns is dA = (0.15~0.17)D, the throat diameter is dB = (0.11~0.13)D, and the outlet diameter is dC = (0.16~0.18)D, where D is the nozzle diameter.

[0014] The second group of oxygen columns has an inlet diameter of da = (0.70~0.72)dA, a throat diameter of db = (0.63~0.65)dB, and an outlet diameter of dc = (0.62~0.64)dC.

[0015] The inlet diameter of the third group of oxygen columns is da' = (0.70~0.72)dA, the throat diameter is db' = (0.63~0.65)dB, and the outlet diameter is dc' = (0.62~0.64)dC.

[0016] The first group of oxygen columns consists of 4 columns, the second group of oxygen columns consists of 2 columns, and the third group of oxygen columns consists of 2 columns.

[0017] Compared with existing technologies, the beneficial effects of this utility model are:

[0018] This invention improves the impact area and depth, and enhances the stirring effect by varying the number of oxygen columns, inlet area, throat area, outlet area, the diameter of the circle where each oxygen column is located, and the alignment of the oxygen column centerline with the nozzle centerline. This improves the smelting efficiency of converter steelmaking. Eight jets are simultaneously blown into the molten pool at three different angles, which not only increases the impact area but also reduces the erosion and corrosion of the furnace lining. Large-diameter oxygen columns use small jet angles, while small-diameter oxygen columns use large jet angles, enhancing the impact force of the jets ejected from the oxygen columns, increasing the impact depth, and improving the ability to stir the molten pool. The concentric arrangement of multiple oxygen columns prolongs the convergence time of the jets ejected from the oxygen columns within the molten pool, enhancing the impact force of each jet and improving the ability to stir the molten pool and the blowing effect. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a dual-angle heterocentric high-efficiency oxygen lance nozzle of the present invention.

[0020] Figure 2 This is a schematic diagram of the oxygen column arrangement of a dual-angle heterocentric high-efficiency blowing oxygen lance nozzle according to the present invention.

[0021] In the diagram: 1-Upper part of the nozzle, 2-Water baffle, 3-Nozzle crown, 4-Outer pipe, 5-Middle pipe, 6-Oxygen pipe, 7-First group of oxygen columns, 8-Second group of oxygen columns, 9-Third group of oxygen columns. Detailed Implementation

[0022] The present invention will be further illustrated below by way of embodiments, but these embodiments are not intended to limit the scope of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0023] See Figures 1-2 As shown, a dual-angle heterocentric high-efficiency oxygen lance nozzle includes a nozzle, an outer tube 4, a middle tube 5, and an oxygen tube 6. The nozzle is integrally formed with an upper nozzle 1, a nozzle crown 3, an oxygen column connected between the upper nozzle 1 and the nozzle crown 3, and a baffle plate 2 integrally connected to the oxygen column. The oxygen tube 6 is connected to the upper nozzle 1, the outer tube 4 is connected to the nozzle crown 3, the middle tube 5 is disposed between the outer tube 4 and the oxygen tube 6, and the baffle plate 2 is connected to the middle tube 5. Three sets of oxygen columns are arranged heterocentrically on different concentric circles. The angle between the first set of oxygen columns 7 and the center line is 8° to 10°, and the angles between the second set of oxygen columns 8 and the third set of oxygen columns 9 and the center line are 14° to 16°. The diameter of the circle containing the first set of oxygen columns 7 is smaller than the diameter of the circle containing the second set of oxygen columns 8, and the diameter of the circle containing the first set of oxygen columns 7 is larger than the diameter of the circle containing the third set of oxygen columns 9.

[0024] The nozzle diameter is 355mm or more.

[0025] The inlet diameter of the first group of oxygen columns 7 is dA = (0.15~0.17)D, the throat diameter is dB = (0.11~0.13)D, and the outlet diameter is dC = (0.16~0.18)D, where D is the nozzle diameter.

[0026] The second group of oxygen columns 8 has an inlet diameter of da = (0.70~0.72)dA, a throat diameter of db = (0.63~0.65)dB, and an outlet diameter of dc = (0.62~0.64)dC.

[0027] The inlet diameter of the third group of oxygen columns 9 is da' = (0.70~0.72)dA, the throat diameter is db' = (0.63~0.65)dB, and the outlet diameter is dc' = (0.62~0.64)dC.

[0028] The first group of oxygen columns 7 consists of 4 columns, the second group of oxygen columns 8 consists of 2 columns, and the third group of oxygen columns 9 consists of 2 columns.

[0029] The present invention relates to a double-angle heterocentric high-efficiency oxygen lance nozzle, which is a cast nozzle. The upper part 1 of the nozzle is connected to the oxygen pipe 6, and the nozzle crown 3 is connected to the outer pipe 4, both of which are connected by copper-steel welding; the baffle plate 2 is connected to the middle pipe 5, and the connection method is threaded connection; the upper part 1 of the nozzle, the baffle plate 2, and the nozzle crown 3 are all integrally cast.

[0030] The manufacturing process of this utility model is as follows:

[0031] The nozzle is integrally cast, and the raw material for the nozzle is electrolytic copper. The upper part 1 of the nozzle is connected to the oxygen pipe 6 by copper-steel welding. The baffle plate 2 is connected to the middle pipe 5 by thread. The nozzle crown 3 is connected to the outer pipe 4 by copper-steel welding.

[0032] The specific process is as follows:

[0033] The sand cores are designed, prepared, and assembled. After the individual sand cores are completed, they are assembled into a mating box, ready for casting. Electrolytic copper is used as the raw material for the nozzle. The raw material is smelted, degassed, and deoxidized before casting. After the nozzle solidifies, the sand box is opened, the riser and gate are removed, forming the cast nozzle. Finally, the nozzle undergoes precision machining to form specific oxygen columns, including the angle, inlet area, throat area, and outlet area. After machining, the nozzle undergoes a hydrostatic test. The nozzle consists of an upper nozzle (1), a baffle plate (2), and a nozzle crown (3), all integrally formed. The first group of oxygen columns (7), the second group of oxygen columns (8), and the third group of oxygen columns (9) are arranged concentrically and alternately on the nozzle crown (3). After the hydrostatic test, the nozzle is connected to the three-layer pipe. The upper nozzle (1) is connected to the oxygen pipe (6) using copper-steel welding, the baffle plate (2) is connected to the middle pipe (5) using threads, and the nozzle crown (3) is connected to the outer pipe (4) using copper-steel welding. After the connection is completed, the nozzle is subjected to a second hydrostatic test, and the weld is subjected to X-ray flaw detection. Once the inspection is passed, the casting of the nozzle is completed.

[0034] Example 1:

[0035] The nozzle designed according to this utility model has a diameter of 355mm. The inlet diameter of the first group of oxygen columns 7 is 59.5mm, the throat diameter is 46mm, and the outlet diameter is 62mm. The inlet diameter of the second group of oxygen columns 8 and the third group of oxygen columns 9 is 40mm, the throat diameter is 26.5mm, and the outlet diameter is 43mm. The angle between the first group of oxygen columns and the centerline is 8°, and the angles between the second group of oxygen columns 8 and the third group of oxygen columns 9 and the centerline are 14° respectively. The radius of the circle containing the first group of oxygen columns 7 is 120mm, the radius of the circle containing the second group of oxygen columns 8 is 140mm, and the radius of the circle containing the third group of oxygen columns 9 is 100mm. Compared with nozzles of the same angle, size, and the same diameter circle containing oxygen columns, the measured impact area and impact depth are significantly increased, thereby improving the jet stirring ability of the molten pool and the blowing effect.

Claims

1. A dual-angle heterocentric high-efficiency blowing oxygen lance nozzle, comprising a nozzle, an outer tube, a middle tube, and an oxygen tube, wherein the nozzle is integrally formed with an upper part of the nozzle, a nozzle crown, an oxygen column connected between the upper part of the nozzle and the nozzle crown, and a baffle plate integrally connected to the oxygen column; the oxygen tube is connected to the upper part of the nozzle, the outer tube is connected to the nozzle crown, the middle tube is disposed between the outer tube and the oxygen tube, and the baffle plate is connected to the middle tube; characterized in that… Three sets of oxygen columns are arranged eccentrically on different concentric circles. The angle between the first set of oxygen columns and the center line is 8° to 10°, and the angle between the second and third sets of oxygen columns and the center line is 14° to 16°. The diameter of the circle containing the first set of oxygen columns is smaller than the diameter of the circle containing the second set of oxygen columns, and the diameter of the circle containing the first set of oxygen columns is larger than the diameter of the circle containing the third set of oxygen columns.

2. The dual-angle heterocentric high-efficiency oxygen lance nozzle according to claim 1, characterized in that, The nozzle diameter is 355mm or more.

3. The dual-angle heterocentric high-efficiency oxygen lance nozzle according to claim 1, characterized in that, The inlet diameter of the first group of oxygen columns is dA = (0.15~0.17)D, the throat diameter is dB = (0.11~0.13)D, and the outlet diameter is dC = (0.16~0.18)D, where D is the nozzle diameter.

4. The dual-angle heterocentric high-efficiency oxygen lance nozzle according to claim 3, characterized in that, The second group of oxygen columns has an inlet diameter of da = (0.70~0.72)dA, a throat diameter of db = (0.63~0.65)dB, and an outlet diameter of dc = (0.62~0.64)dC.

5. A dual-angle heterocentric high-efficiency oxygen lance nozzle according to claim 3, characterized in that, The inlet diameter of the third group of oxygen columns is da' = (0.70~0.72)dA, the throat diameter is db' = (0.63~0.65)dB, and the outlet diameter is dc' = (0.62~0.64)dC.

6. A dual-angle heterocentric high-efficiency oxygen lance nozzle according to any one of claims 1-3, characterized in that, The first group of oxygen columns consists of 4 columns, the second group of oxygen columns consists of 2 columns, and the third group of oxygen columns consists of 2 columns.

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