Double-angle heterocentric efficient blowing oxygen lance nozzle and manufacturing process

Abstract

The invention relates to a double-angle heterocentric efficient blowing oxygen lance nozzle and a manufacturing process. The double-angle heterocentric efficient blowing oxygen lance nozzle comprises a nozzle body, an outer pipe, a middle pipe and an oxygen pipe. The nozzle body is integrally provided with a nozzle upper portion, a nozzle head crown, an oxygen column connected between the nozzle upper portion 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 increased and the stirring effect is enhanced under the condition that a certain impact area is guaranteed.

Description

Technical Field

[0001] The invention belongs to the field of metallurgical steelmaking, and in particular relates to a double-angle eccentric high-efficiency blowing oxygen lance nozzle and a manufacturing process. Background Art

[0002] Converter steelmaking is the main process of steel production. The output of converter steelmaking in my country accounts for about 90% of the total output. The converter oxygen lance is one of the most important process equipment in the converter steelmaking process. The performance and life of the oxygen lance 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 continue to decay. Eventually, the jet enters the molten pool, stirring the molten steel to move, thereby completing the steel smelting.

[0004] By changing the layout, flow ratio, inclination angle, outlet center distance and other design parameters of the oxygen lance nozzle and changing the operating pressure and smelting lance position, the oxygen lance jet has good independence and good dynamic conditions, which plays the role of heating, decarburization and dephosphorization of the converter molten steel.

[0005] The traditional arrangement of oxygen lance nozzles with equal flow and equal inclination angle has great limitations in improving the efficiency of oxygen lance smelting. At present, domestic steel enterprises mainly have problems such as low oxygen supply intensity, long blowing time, difficulty in slagging, low dephosphorization rate and easy splashing. The dual-flow and dual-angle oxygen lance nozzles have great potential in improving the economic benefits of smelting.

[0006] At present, the relevant patents and known technical documents of dual-angle and dual-flow nozzles are as follows:

[0007] Patent CN 201908105U introduces "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, and the patent does not consider the impact of the size change of the dual nozzle on the blowing area.

[0008] Patent CN 216337769 U introduces "a dual-angle and multi-flow porous oxygen lance nozzle". The patent divides the nozzle into two groups for staggered arrangement, and designs their oxygen flow and angle respectively, forming multiple supersonic oxygen jets with different angles, flow rates and cross-arrangement, thereby expanding the impact area of ​​oxygen on the molten pool. However, the multiple jets may cross prematurely, affecting the stirring effect. Summary of the invention

[0009] In view of the above problems, the present invention provides a double-angle eccentric high-efficiency blowing oxygen lance nozzle and a manufacturing process, which improves the impact depth and enhances the stirring effect while ensuring a certain impact area by changing the number of oxygen columns, inlet area, throat area, outlet area, the diameter of the circle where each oxygen column is located, and the angle between the center line of the oxygen column and the center line of the nozzle.

[0010] To achieve the above object, the present invention adopts the following technical solutions:

[0011] A double-angle eccentric high-efficiency blowing oxygen lance nozzle comprises a nozzle, an outer tube, a middle tube and an oxygen tube. The nozzle is integrally formed with a nozzle upper portion, a nozzle crown, an oxygen column connected between the nozzle upper portion and the nozzle crown, and a water baffle connected to the oxygen column. The oxygen tube is connected to the nozzle upper portion, the outer tube is connected to the nozzle crown, the middle tube is arranged between the outer tube and the oxygen tube, and the water baffle is connected to the middle tube. Three groups of oxygen columns are eccentrically and staggeredly arranged on different concentric circles, the angle between the first group of oxygen columns and the center line is 8° to 10°, and the angle between the second group of oxygen columns and the third group of oxygen columns and the center line is 14° to 16°. The diameter of the circle where the first group of oxygen columns is located is smaller than the diameter of the circle where the second group of oxygen columns is located, and the diameter of the circle where the first group of oxygen columns is located is larger than the diameter of the circle where the third group of oxygen columns is located.

[0012] The nozzle diameter is greater than 355 mm.

[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 inlet diameter of the second 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.

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

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

[0017] A manufacturing process for a double-angle eccentric high-efficiency blowing oxygen lance nozzle, wherein the nozzle is integrally cast, the nozzle raw material is electrolytic copper, the upper portion of the nozzle is connected to the oxygen pipe by copper-steel welding, the water baffle is connected to the middle pipe by threads, and the nozzle crown is connected to the outer pipe by copper-steel welding.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present invention improves the impact area and impact depth, strengthens the stirring effect, and thus improves the smelting efficiency of converter steelmaking by changing the number of oxygen columns, inlet area, throat area, outlet area, the diameter of the circle where each oxygen column is located, and the center line of the oxygen column and the center line of the nozzle. Eight jets are blown to the molten pool at three different angles at the same time, which not only increases the impact area, but also reduces the erosion and corrosion of the furnace lining by the jets; the oxygen column with a large outlet diameter adopts a small jet angle, and the oxygen column with a small outlet diameter adopts a large jet angle, which enhances the impact force of the jet ejected from the oxygen column, increases the impact depth, and improves the ability to stir the molten pool; multiple oxygen columns are arranged in an eccentric manner, which prolongs the convergence time of the jets ejected from the oxygen column in the molten pool, enhances the impact force of each jet, and improves the ability to stir the molten pool and the blowing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The present invention is a schematic structural diagram of a double-angle eccentric high-efficiency blowing oxygen lance nozzle.

[0021] Figure 2 This is a schematic diagram of the oxygen column arrangement of a double-angle eccentric high-efficiency blowing oxygen lance nozzle of the present invention.

[0022] In the figure: 1-top of the nozzle, 2-water baffle, 3-nozzle crown, 4-outer tube, 5-middle tube, 6-oxygen tube, 7-first group of oxygen columns, 8-second group of oxygen columns, 9-third group of oxygen columns. DETAILED DESCRIPTION

[0023] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples. Based on the examples in the present invention, all other examples obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0024] See Figure 1-Figure 2 As shown, a double-angle eccentric high-efficiency blowing oxygen lance nozzle comprises a nozzle, an outer tube 4, a middle tube 5, and an oxygen tube 6. The nozzle is integrally formed with a nozzle upper portion 1, a nozzle crown 3, an oxygen column connected between the nozzle upper portion 1 and the nozzle crown 3, and a water baffle 2 integrally connected to the oxygen column. The oxygen tube 6 is connected to the nozzle upper portion 1, the outer tube 4 is connected to the nozzle crown 3, the middle tube 5 is arranged between the outer tube 4 and the oxygen tube 6, and the water baffle 2 is connected to the middle tube 5; three groups of oxygen columns are eccentrically and staggeredly arranged on different concentric circles, the angle between the first group of oxygen columns 7 and the center line is 8° to 10°, and the angle between the second group of oxygen columns 8 and the third group of oxygen columns 9 and the center line is 14° to 16°; and the diameter of the circle where the first group of oxygen columns 7 is located is smaller than the diameter of the circle where the second group of oxygen columns 8 is located, and the diameter of the circle where the first group of oxygen columns 7 is located is larger than the diameter of the circle where the third group of oxygen columns 9 is located.

[0025] The nozzle diameter is greater than 355 mm.

[0026] 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.

[0027] The inlet diameter of the second group of oxygen columns 8 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 third group of oxygen columns 9 has an inlet diameter da'=(0.70-0.72)dA, a throat diameter db'=(0.63-0.65)dB, and an outlet diameter dc'=(0.62-0.64)dC.

[0029] The first group of oxygen columns 7 includes four, the second group of oxygen columns 8 includes two, and the third group of oxygen columns 9 includes two.

[0030] The double-angle eccentric high-efficiency blowing oxygen lance nozzle of the present invention is a casting nozzle. The nozzle upper part 1 is connected to the oxygen pipe 6, the nozzle crown 3 is connected to the outer pipe 4, and the connection method is copper-steel welding; the water baffle 2 is connected to the middle pipe 5, and the connection method is threaded connection; the nozzle upper part 1, the water baffle 2, and the nozzle crown 3 are integrally cast.

[0031] The manufacturing process of the present invention is as follows:

[0032] The nozzle is integrally cast, the nozzle material is electrolytic copper, the nozzle upper part 1 is connected to the oxygen tube 6 by copper-steel welding, the water retaining plate 2 is connected to the middle tube 5 by threading, and the nozzle crown 3 is connected to the outer tube 4 by copper-steel welding.

[0033] The specific process is as follows:

[0034] Design and prepare the assembled sand core. After each single sand core is completed, assemble it into a matching box and wait for pouring. The raw material of the nozzle is electrolytic copper. The raw material is smelted, degassed, and deoxidized, and then poured. After the nozzle solidifies, open the sand box, cut off the riser and gate to form a casting nozzle, and finally machine the nozzle to form a specific oxygen column, including the angle, inlet area, throat area, and outlet area of ​​the oxygen column. After machining, the nozzle is subjected to a water pressure test. The nozzle is composed of a nozzle upper part 1, a water baffle 2, and a nozzle crown 3. The first group of oxygen columns 7, the second group of oxygen columns 8, and the third group of oxygen columns 9 are eccentrically arranged on the nozzle crown 3. After the first water pressure is completed, the nozzle is connected to the three-layer pipe. The nozzle upper part 1 is connected to the oxygen pipe 6 by copper-steel welding, the water baffle 2 is connected to the middle pipe 5 by threading, and the nozzle crown 3 is connected to the outer pipe 4 by copper-steel welding. After the connection is completed, the nozzle is subjected to a secondary water pressure test and the weld is subjected to an X-ray flaw detection test. After the inspection is passed, the casting nozzle is manufactured.

[0035] Embodiment 1:

[0036] The nozzle designed according to the present invention has a diameter of 355 mm, the inlet diameter of the first oxygen column 7 is 59.5 mm, the throat diameter is 46 mm, and the outlet diameter is 62 mm. The inlet diameters of the second oxygen column 8 and the third oxygen column 9 are 40 mm, the throat diameter is 26.5, and the outlet diameter is 43. The angle between the first oxygen column and the center line is 8°, and the angle between the second oxygen column 8 and the third oxygen column 9 and the center line is 14° respectively. The radius of the circle where the first oxygen column 7 is located is 120 mm, the radius of the circle where the second oxygen column 8 is located is 140 mm, and the radius of the circle where the third oxygen column 9 is located is 100 mm. Compared with nozzles with the same angle, size, and oxygen column in the same diameter circle, the impact area and impact depth are significantly increased, thereby improving the ability of the jet to stir the molten pool and the blowing effect.

Claims

1. A double-angle eccentric 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 a nozzle upper portion, a nozzle crown, an oxygen column connected between the nozzle upper portion and the nozzle crown, and a water baffle integrally connected to the oxygen column, the oxygen tube is connected to the nozzle upper portion, the outer tube is connected to the nozzle crown, the middle tube is arranged between the outer tube and the oxygen tube, and the water baffle is connected to the middle tube; characterized in that, Three groups of oxygen columns are arranged eccentrically and alternately on different concentric circles, the angle between the first group of oxygen columns and the center line is 8° to 10°, and the angle between the second group of oxygen columns and the third group of oxygen columns and the center line is 14° to 16°; and the diameter of the circle where the first group of oxygen columns is located is smaller than the diameter of the circle where the second group of oxygen columns is located, and the diameter of the circle where the first group of oxygen columns is located is larger than the diameter of the circle where the third group of oxygen columns is located.

2. A double-angle eccentric high-efficiency blowing oxygen lance nozzle according to claim 1, characterized in that: The nozzle diameter is greater than 355 mm.

3. A double-angle eccentric high-efficiency blowing 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. A double-angle eccentric high-efficiency blowing oxygen lance nozzle according to claim 3, characterized in that: The inlet diameter of the second 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.

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

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

7. A manufacturing process for a double-angle eccentric high-efficiency blowing oxygen lance nozzle according to any one of claims 1 to 6, characterized in that: The nozzle is integrally cast, the nozzle material is electrolytic copper, the upper part of the nozzle is connected to the oxygen pipe by copper-steel welding, the water retaining plate is connected to the middle pipe by threading, and the nozzle crown is connected to the outer pipe by copper-steel welding.

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