Anti-slag-absorption oxygen lance nozzle with secondary combustion function

Abstract

The invention relates to the technical field of refining equipment, in particular to an anti-slag-suction oxygen lance nozzle with a secondary combustion function, which comprises an oxygen lance nozzle body, a main spray hole and a body straight channel, a flow guide nozzle is connected to the bottom of the body straight channel, a nozzle straight channel is arranged in the middle of the flow guide nozzle, and the body straight channel is communicated with the nozzle straight channel. A plurality of fan-shaped spray holes communicated with the nozzle straight channel are formed in the circumference of the flow guide nozzle, and the fan-shaped spray holes and the main spray holes are arranged in a staggered mode. The cross sectional area of the body straight channel is 1 / 8-1 / 4 of the cross sectional area of the main spraying hole, and the sum of the cross sectional areas of inlets of all the fan-shaped spraying holes is smaller than or equal to the cross sectional area of the body straight channel. The spraying areas of the fan-shaped spraying holes form high-pressure airflow on the surface of the end of the oxygen lance nozzle, and molten steel and slag are prevented from being sucked into the center area of the end face of the nozzle. Meanwhile, oxygen sprayed by the fan-shaped spray holes can burn CO gas generated in the smelting process of the converter, the secondary combustion effect is achieved, and the smelting thermal efficiency of the converter is improved.

Description

Technical Field

[0001] The invention relates to the technical field of refining equipment, and in particular to an anti-slag suction oxygen lance nozzle with a secondary combustion function. Background Art

[0002] At present, medium and large converters all use porous oxygen lance nozzles, which have many outstanding advantages: such as improving the oxygen supply intensity and smelting intensity, increasing the impact area, facilitating slag formation, and operating smoothly without splashing. However, the central area of ​​the end face of the porous nozzle (commonly known as the nose tip) has poor cooling effect, and the air pressure in this area is low during the blowing process. The molten steel and slag are easily sucked in and adhere to the nozzle and burned. In addition, the secondary combustion of carbon monoxide gas generated during the converter smelting process requires a special spray gun to be set on the gun body, which increases the complexity of the structure. This problem has never been effectively solved. To this end, people have made many attempts, but none of them have obvious effects.

[0003] Existing patent CN105220102A discloses a method for extending the life of an oxygen lance nozzle by reducing the slag sticking to the oxygen lance nozzle. The steps of the method include: removing organic dirt on the surface of the copper oxygen lance nozzle by steam degreasing and purging to obtain a clean oxygen lance nozzle; fixing the clean oxygen lance nozzle on a fixed frame for preheating, and the preheating temperature is 573K-723K; using a plasma spray gun to spray the surface of the oxygen lance nozzle, the maximum power of the plasma spray gun is 80kW, the maximum current is 1000A, and the no-load voltage is 80V, and argon is used to feed boron nitride particles into the powder feeding port of the plasma spray gun, and the boron nitride particles are sprayed onto the surface of the oxygen lance nozzle to obtain an oxygen lance nozzle with a boron nitride coating. The present invention combines boron nitride with a copper oxygen lance nozzle to form a boron nitride coating, which is not only resistant to high temperature and corrosion, but also does not react with steel slag, thereby reducing the amount of slag sticking to the oxygen lance nozzle during converter steelmaking and extending the service life of the oxygen lance nozzle.

[0004] The existing patent CN102312041A discloses an oxygen lance nozzle anti-corrosion method and an oxygen lance nozzle. By adopting an extrusion molding process, the grain arrangement of the nozzle end face is made more compact, the nozzle end face's ability to resist scouring and soaking by slag and molten steel is improved, and an alloy heat-insulating material is sprayed on the nozzle end face to form a heat-insulating layer, which enhances the heat-insulating and radiation-insulating functions of the nozzle end face, avoids the bonding of copper and steel at high temperatures, and makes the oxygen lance nozzle more resistant to high temperatures. Therefore, the present invention can greatly extend the service life of the oxygen lance nozzle and reduce production costs.

[0005] The above patents all form coatings by spraying boron nitride or the like on the nozzle surface in order to reduce the amount of slag sticking to the oxygen lance nozzle during converter steelmaking and extend the service life of the oxygen lance nozzle. However, the coating itself has a limited service life and is easily detached under the rapid cooling and heating of the adsorbed molten steel and slag. Therefore, the above patents are far from achieving the ideal effect and cannot meet the needs well. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a slag-absorbing anti-oxygen lance nozzle with a secondary combustion function, thereby preventing the occurrence of steel slag adhesion.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] A slag suction-proof oxygen lance nozzle with a secondary combustion function comprises an oxygen lance nozzle body, a main spray hole, and a body straight channel. A guide nozzle is connected to the bottom of the body straight channel, a nozzle straight channel is provided in the middle of the guide nozzle, the body straight channel is connected to the nozzle straight channel, a plurality of fan-shaped spray holes connected to the nozzle straight channel are provided on the circumference of the guide nozzle, and the fan-shaped spray holes and the main spray holes are arranged alternately.

[0009] The cross-sectional area of ​​the main body straight channel is 1 / 8-1 / 4 of the cross-sectional area of ​​the main spray hole, and the sum of the cross-sectional areas at the entrances of all the fan-shaped spray holes is less than or equal to the cross-sectional area of ​​the main body straight channel.

[0010] The flow guide nozzle is threadedly connected to the straight channel of the body.

[0011] The fan-shaped spray holes are evenly distributed on the outer circumference of the guide nozzle.

[0012] n is the number of main nozzles of the oxygen lance nozzle.

[0013] The number of the fan-shaped spray holes is the same as that of the main spray holes.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The high-pressure airflow ejected from the fan-shaped spray hole of the flow guide nozzle of the present invention does not interfere with the airflow ejected from the main spray hole. The spray area of ​​the fan-shaped spray hole forms a high-pressure airflow on the surface of the end of the oxygen lance nozzle, which prevents the center area of ​​the nozzle end face from sucking in molten steel and slag, thereby preventing the occurrence of adhesion. Compared with the general oxygen lance nozzle, the service life of the oxygen lance nozzle is significantly improved. At the same time, the oxygen ejected from the fan-shaped spray hole can burn the CO gas generated in the converter smelting process, play a secondary combustion role, and improve the thermal efficiency of converter smelting. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural diagram of the present invention.

[0017] Figure 2 It is a top view of the present invention.

[0018] Figure 3 This is a structural diagram of the nozzle body.

[0019] Figure 4 A cross-sectional view of the guide nozzle.

[0020] Figure 5 for Figure 4 Middle AA section view.

[0021] In the figure: 1. Oxygen lance nozzle body; 2. Guide nozzle; 3. Main spray hole; 4. Body straight channel; 5. Fan-shaped spray hole; 6. Nozzle straight channel. DETAILED DESCRIPTION

[0022] In the description of the present invention, it is to be understood that the terms "first", "second", etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the feature. In the description of the present invention, unless otherwise specified, "plurality" means more than two.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0024] like Figure 1-Figure 5 A slag-absorbing anti-oxygen lance nozzle with a secondary combustion function comprises an oxygen lance nozzle body 1, a main spray hole 3, and a body straight channel 4. A guide nozzle 2 is connected to the bottom of the body straight channel 4. A nozzle straight channel 6 is provided in the middle of the guide nozzle 2. The body straight channel 4 is connected to the nozzle straight channel 6. A plurality of fan-shaped spray holes 5 connected to the nozzle straight channel 6 are provided on the circumference of the guide nozzle 2. The fan-shaped spray holes 5 and the main spray holes 3 are arranged alternately.

[0025] The cross-sectional area of ​​the main body straight channel 4 is 1 / 8-1 / 4 of the cross-sectional area of ​​the main spray hole 3 , and the sum of the inlet cross-sectional areas of all the fan-shaped spray holes 5 is less than or equal to the cross-sectional area of ​​the main body straight channel 4 .

[0026] The flow guide nozzle 2 is threadedly connected to the main body straight channel 4.

[0027] The fan-shaped spray holes 5 are evenly distributed on the outer circumference of the guide nozzle 2 .

[0028] n is the number of main nozzles of the oxygen lance nozzle.

[0029] The number of the fan-shaped spray holes 5 is the same as the number of the main spray holes 3 .

[0030] A method for using an anti-slag suction oxygen lance nozzle with a secondary combustion function. After the converter blowing starts to supply oxygen, most of the oxygen is ejected from the main spray hole 3, and a small amount of oxygen enters the main body straight channel 4, and then ejected from the fan-shaped spray hole 5 of the guide nozzle 2. Since the fan-shaped spray hole 5 and the main spray hole 3 are arranged in an interlaced manner, the airflow ejected from the fan-shaped spray hole 5 just avoids the airflow ejected from the main spray hole 3. The fan-shaped spray hole 5 and the main spray hole 3 eject oxygen airflow in an interlaced manner without interfering with each other. The high-pressure airflow ejected from the fan-shaped spray hole 5 prevents the central area of ​​the end face of the porous oxygen lance nozzle from sucking in molten steel and slag, thereby preventing the occurrence of adhesion. At the same time, it can burn the CO gas generated during the converter smelting process to improve the thermal efficiency of the converter smelting.

[0031] In order to make the purpose, technical scheme and technical effect of the present invention clearer, the technical scheme in the embodiment of the present invention is now clearly and completely described. However, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. In combination with the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Embodiment 1:

[0033] An anti-slag suction oxygen lance nozzle with a secondary combustion function comprises an oxygen lance nozzle body 1, main spray holes 3, and a body straight channel 4, wherein the number of the main spray holes 3 is five.

[0034] The guide nozzle 2 is threadedly connected to the bottom of the main body straight channel 4, a nozzle straight channel 6 is provided in the middle of the guide nozzle 2, the main body straight channel 4 is connected to the nozzle straight channel 6, and 5 fan-shaped spray holes 5 connected to the nozzle straight channel 6 are provided on the circumference of the guide nozzle 2, the fan-shaped spray holes 5 have a fan angle of 36°, and the fan-shaped spray holes 5 and the main spray holes 3 are staggered.

[0035] The cross-sectional area of ​​the main body straight channel 4 is 1 / 8 of the cross-sectional area of ​​the main spray hole 3 , and the sum of the inlet cross-sectional areas of all the fan-shaped spray holes 5 is smaller than the cross-sectional area of ​​the main body straight channel 4 .

[0036] Embodiment 2:

[0037] An anti-slag suction oxygen lance nozzle with a secondary combustion function comprises an oxygen lance nozzle body 1, main spray holes 3, and a body straight channel 4, wherein the main spray holes 3 are evenly distributed on 6 circles.

[0038] The guide nozzle 2 is threadedly connected to the bottom of the main body straight channel 4, a nozzle straight channel 6 is provided in the middle of the guide nozzle 2, the main body straight channel 4 is connected to the nozzle straight channel 6, and 6 fan-shaped spray holes 5 connected to the nozzle straight channel 6 are evenly distributed on the circumference of the guide nozzle 2, the fan-shaped spray holes 5 have a fan angle of 30°, and the fan-shaped spray holes 5 and the main spray holes 3 are staggered.

[0039] The cross-sectional area of ​​the main body straight channel 4 is 1 / 4 of the cross-sectional area of ​​the main spray hole 3 , and the sum of the inlet cross-sectional areas of all the fan-shaped spray holes 5 is equal to the cross-sectional area of ​​the main body straight channel 4 .

[0040] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and basic spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An anti-slag suction oxygen lance nozzle with secondary combustion function, characterized in that: It includes an oxygen lance nozzle body, a main spray hole, and a body straight channel. A guide nozzle is connected to the bottom of the body straight channel. A nozzle straight channel is arranged in the middle of the guide nozzle. The body straight channel is connected to the nozzle straight channel. A plurality of fan-shaped spray holes connected to the nozzle straight channel are arranged on the circumference of the guide nozzle. The fan-shaped spray holes and the main spray holes are arranged alternately.

2. The anti-slag suction oxygen lance nozzle with secondary combustion function according to claim 1 is characterized in that: The cross-sectional area of ​​the main body straight channel is 1 / 8-1 / 4 of the cross-sectional area of ​​the main spray hole, and the sum of the cross-sectional areas at the entrances of all the fan-shaped spray holes is less than or equal to the cross-sectional area of ​​the main body straight channel.

3. The anti-slag suction oxygen lance nozzle with secondary combustion function according to claim 1 is characterized in that: The flow guide nozzle is threadedly connected to the straight channel of the body.

4. The anti-slag suction oxygen lance nozzle with secondary combustion function according to claim 1, characterized in that: The fan-shaped spray holes are evenly distributed on the outer circumference of the guide nozzle.

5. The anti-slag suction oxygen lance nozzle with secondary combustion function according to claim 1, characterized in that: The n is the number of main nozzles of the oxygen lance nozzle.

6. The anti-slag suction oxygen lance nozzle with secondary combustion function according to claim 1, characterized in that: The number of the fan-shaped spray holes is the same as that of the main spray holes.

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