Detachable oxygen lance head

Abstract

The utility model relates to a detachable oxygen lance head which comprises an oxygen lance body, an oxygen channel and a cooling water channel are arranged on the oxygen lance body, the cooling water channel surrounds the periphery of the oxygen channel, two nitrogen channels are symmetrically arranged in the cooling water channel in a penetrating mode, and detachable nitrogen lance heads are arranged at the ends of the nitrogen channels. The nitrogen gun head is sequentially provided with a first-stage nitrogen blowing cavity and a second-stage nitrogen blowing cavity from the end part to the top, and the nitrogen channel can slide up and down to be communicated with the first-stage nitrogen blowing cavity and the second-stage nitrogen blowing cavity so as to blow out nitrogen at different angles; the two nitrogen channels can slide up and down at the same time or respectively so as to be communicated with the first-stage nitrogen blowing cavity and / or the second-stage nitrogen blowing cavity at the same time or respectively, nitrogen at different angles is blown out through the formed first-stage nitrogen blowing holes or second-stage nitrogen blowing holes, slag is more evenly splashed to the furnace wall, and the device is reasonable in structure and high in practicability. By arranging the detachable oxygen lance head, nitrogen can be blown out from multiple angles, the slag splashing quality is improved, and meanwhile the oxygen blowing effect of the lance head is not affected.

Description

Technical Field

[0001] This utility model relates to the field of converter smelting technology, specifically to a detachable oxygen lance head. Background Technology

[0002] In converter smelting, scrap steel, molten iron, and slag-forming materials are loaded into the furnace according to the batching requirements. After the materials are added, an oxygen lance is inserted into the furnace from the top to blow in high-pressure oxygen. The oxygen directly reacts with the high-temperature molten iron to form an oxidation reaction. The slag-forming materials react to remove impurities and generate molten slag that floats on the surface of the molten steel. After the steel is tapped from the converter, nitrogen is used to splash the molten slag onto the inner wall of the furnace lining. The molten slag cools and solidifies on the surface of the furnace lining to form a high-melting-point slag layer. The slag layer adheres well to the furnace lining, thus protecting the furnace. Slag splashing for furnace protection is a major advancement in converter furnace protection technology and significantly increases the service life of the converter. In slag splashing furnace protection technology, the nitrogen supply system has a direct impact on the formation of the molten slag layer. In traditional technology, oxygen and nitrogen share the same gas supply system. The oxygen lance head is modified to supply nitrogen for slag splashing. The design of the oxygen lance head orifice diameter and outlet angle must consider both the stirring of the molten pool and the slag splashing effect. When prioritizing the blowing and slag formation in the furnace, the slag splashing effect is often not ideal. Therefore, an oxygen lance head that is suitable for nitrogen blowing and splashing molten slag and can make the molten slag evenly cover the furnace wall surface is required. Utility Model Content

[0003] The purpose of this invention is to provide a detachable oxygen lance head suitable for splashing slag, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A detachable oxygen lance head includes an oxygen lance body, on which an oxygen channel and a cooling water channel are provided. The cooling water channel surrounds the outer periphery of the oxygen channel, and two nitrogen channels are symmetrically arranged within the cooling water channel. A detachable nitrogen lance head is provided at the end of each nitrogen channel. The nitrogen lance head is fitted and fixed to the oxygen lance body. The nitrogen lance head has a primary nitrogen blowing chamber and a secondary nitrogen blowing chamber separated by a partition from the end upwards. The nitrogen channels can slide up and down and connect with the primary and secondary nitrogen blowing chambers to blow out nitrogen at different angles.

[0006] The aforementioned detachable oxygen lance head has two nitrogen channels that can slide up and down simultaneously or separately, thereby connecting simultaneously or separately to the primary nitrogen blowing chamber and / or the secondary nitrogen blowing chamber.

[0007] The aforementioned detachable oxygen lance head has a positioning platform on the oxygen lance body that is adapted to the partition, and the nitrogen lance head clamps the partition under the positioning platform.

[0008] The aforementioned detachable oxygen lance head has a primary nitrogen blowing chamber that is shaped like an inverted frustum with a larger top and a smaller bottom. Multiple rings of primary nitrogen blowing holes are arranged in a circular array on the bottom surface of the primary nitrogen blowing chamber, and a ring of primary nitrogen blowing holes is arranged in a circular array on the conical surface of the primary nitrogen blowing chamber.

[0009] In the aforementioned detachable oxygen lance head, all the primary nitrogen blowing holes are inclined outwards. The angle between the axis of the primary nitrogen blowing hole located on the bottom surface of the primary nitrogen blowing chamber and the center line of the oxygen lance head is set between 5° and 30°, and the angle between the axis of the primary nitrogen blowing hole located on the conical surface and the center line of the oxygen lance head is set between 40° and 60°.

[0010] The aforementioned detachable oxygen lance head has a secondary nitrogen blowing chamber arranged in a circumferential array with a ring of secondary nitrogen blowing holes, and the inner port of the secondary nitrogen blowing holes is located above the positioning platform.

[0011] In the aforementioned detachable oxygen lance head, the secondary nitrogen blowing hole is inclined downwards, with its axis forming an angle between 80° and 110° with the center line of the oxygen lance head, and its outer port is configured as an elongated oval hole extending upwards.

[0012] The aforementioned detachable oxygen lance head has a limiting plate at the lower end of the nitrogen channel, and a support column is provided on the bottom surface of the limiting plate. The distance between the limiting plate and the lower edge of the nitrogen channel outlet is equal to or greater than the thickness of the partition plate.

[0013] The aforementioned detachable oxygen lance head has a matching thread between the nitrogen lance head and the oxygen lance body, and the nitrogen lance head is fixed to the end of the oxygen lance body by the thread.

[0014] The aforementioned detachable oxygen lance head has an oxygen blowing hole integrally formed with the oxygen lance body at the end of the oxygen channel axis.

[0015] The beneficial effects of adopting the above technical solution are:

[0016] The detachable oxygen lance head provided by this utility model adopts a nitrogen lance head that is movably connected to the oxygen lance body. This allows oxygen and nitrogen to be blown out from different channels of the lance head, eliminating the need to consider slag splashing requirements for the oxygen blowing holes and better meeting the stirring function of the molten pool. At the same time, it allows nitrogen to be blown out from multiple angles and directions, resulting in more uniform slag splashing. The nitrogen lance head is equipped with a primary nitrogen blowing chamber and a secondary nitrogen blowing chamber, each with nitrogen blowing holes at multiple angles, which can better splash molten slag onto the inner wall of the furnace lining. In addition, the connection between the two nitrogen channels and the primary and secondary nitrogen blowing chambers can be selectively controlled, making the operation more flexible and the nitrogen blowing more diverse. The nitrogen lance head adopts a detachable threaded connection, which facilitates the replacement of different models of lance heads and reduces the operating cost. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the assembled structure of this utility model;

[0018] Figure 2 This is a utility model Figure 1 Cross-sectional structural diagram;

[0019] Figure 3 This is a schematic diagram of the structure of this utility model in its exploded state.

[0020] In the diagram: 1. Oxygen lance body; 1-1. Oxygen channel; 1-2. Cooling water channel; 1-3. Positioning platform; 2. Nitrogen channel; 2-1. Limiting plate; 2-2. Support column; 3. Nitrogen lance head; 3-1. Primary nitrogen blowing chamber; 3-1-1. Primary nitrogen blowing hole; 3-2. Secondary nitrogen blowing chamber; 3-2-1. Secondary nitrogen blowing hole; 4. Partition plate. Detailed Implementation

[0021] To make the objectives, technical solutions and advantages of this utility model clearer, the utility model will be clearly and completely described below in conjunction with specific embodiments.

[0022] like Figures 1 to 3 The detachable oxygen lance head shown includes an oxygen lance body 1, on which an oxygen channel 1-1 and a cooling water channel 1-2 are provided. The cooling water channel 1-2 surrounds the oxygen channel 1-1 and circulates cooling water to cool the oxygen lance head. Two nitrogen channels 2 are symmetrically arranged inside the cooling water channel 1-2, with their ends exposed below the cooling water channel 1-2. A detachable nitrogen lance head 3 is provided on the outer side of the end of the nitrogen channel 2. The nitrogen lance head 3 is fitted and fixed to the oxygen lance body 1, which can be connected by clamps or threads. In this embodiment, a matching thread is provided between the nitrogen lance head 3 and the oxygen lance body 1, and the nitrogen lance head 3 is fixed to the end of the oxygen lance body 1 by the thread. The upper part is provided with a primary nitrogen blowing chamber 3-1 and a secondary nitrogen blowing chamber 3-2 separated by a partition 4. The nitrogen channel 2 can slide up and down and connect to the primary nitrogen blowing chamber 3-1 and the secondary nitrogen blowing chamber 3-2 to blow out nitrogen at different angles. The two nitrogen channels 2 can slide up and down simultaneously or separately, and thus connect to the primary nitrogen blowing chamber 3-1 and / or the secondary nitrogen blowing chamber 3-2 simultaneously or separately. That is, the two nitrogen channels 2 can be connected to the primary nitrogen blowing chamber 3-1 and the secondary nitrogen blowing chamber 3-2 respectively, and supply gas to the two chambers at the same time. Alternatively, the two nitrogen channels 2 can be connected to the primary nitrogen blowing chamber 3-1 or the secondary nitrogen blowing chamber 3-2 at the same time, and supply gas to only one chamber, so as to adjust the intensity and angle of the blown nitrogen.

[0023] like Figure 2 and Figure 3As shown, the oxygen lance body 1 is provided with a positioning platform 1-3 adapted to the partition 4. The nitrogen lance head 3 clamps the partition 4 under the positioning platform 1-3. Below the partition 4 is the primary nitrogen blowing chamber 3-1. The primary nitrogen blowing chamber 3-1 is shaped like an inverted frustum, larger at the top and smaller at the bottom. Multiple rings of primary nitrogen blowing holes 3-1-1 are arranged in a circular array on the bottom surface of the primary nitrogen blowing chamber 3-1. A ring of primary nitrogen blowing holes 3-1-1 is arranged in a circular array on the conical surface of the primary nitrogen blowing chamber 3-1. All primary nitrogen blowing holes 3-1-1 are inclined outward to facilitate the slag to be pushed outward layer by layer and splashed onto the inner wall of the furnace lining. In this embodiment, the angle between the axis of the primary nitrogen blowing holes 3-1-1 on the bottom surface of the primary nitrogen blowing chamber 3-1 and the center line of the oxygen lance head is set between 5° and 30°. The angle between the axis of the primary nitrogen blowing holes 3-1-1 on the conical surface and the center line of the oxygen lance head is set between 40° and 60°. Above the partition 4 is the secondary nitrogen blowing chamber 3-2. The secondary nitrogen blowing chamber 3-2 is arranged in a circumferential array with a ring of secondary nitrogen blowing holes 3-2-1. The secondary nitrogen blowing holes 3-2-1 are inclined downwards, and their inclination angle is gentler than that of the primary nitrogen blowing holes 3-1-1, which is conducive to blowing nitrogen gas from the side. The inner port is located above the positioning platform 1-3, and the outer outlet can be located above or below the partition 4, depending on the inclination angle selected. In this embodiment, the angle between the axis of the secondary nitrogen blowing hole 3-2-1 and the center line of the oxygen lance head is set between 80° and 110°. Its outer port is set as an elongated oval hole extending upwards. The elongated oval hole at the end allows the nitrogen gas flow to diffuse upwards, blowing the slag outwards and upwards, splashing onto the inner wall of the furnace lining to form a molten slag layer to protect the furnace.

[0024] like Figure 2 and Figure 3 As shown, a limiting plate 2-1 is provided at the lower end of the nitrogen channel 2, and a support column 2-2 is provided on the bottom surface of the limiting plate 2-1. The distance between the limiting plate 2-1 and the lower edge of the air outlet of the nitrogen channel 2 is equal to or greater than the thickness of the partition 4. The outer circle dimension of the limiting plate 2-1 is larger than the through hole on the partition 4. The nitrogen channel 2 slides upward until the limiting plate 2-1 is stuck below the partition 4. At this time, the air outlet of the nitrogen channel 2 is only connected to the secondary nitrogen blowing chamber 3-2. When the nitrogen channel 2 slides downward, the support column 2-2 rests on the inner bottom surface of the primary nitrogen blowing chamber 3-1. At this time, the air outlet is only connected to the primary nitrogen blowing chamber 3-1. The operator can accurately grasp the connection status of the nitrogen channel 2. The oxygen channel 1-1 has an oxygen blowing hole 1-1-1 integrally formed with the oxygen lance body 1 at its end. The structure of the oxygen blowing hole 1-1-1 is independent of the nitrogen lance head 3. In this embodiment, the oxygen blowing hole 1-1-1 is set on the axis of the oxygen lance body 1, or it can be set as multiple oxygen blowing holes 1-1-1 surrounding the axis.

[0025] This article uses specific embodiments to illustrate the principles and implementation methods of this utility model in detail. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. Those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. However, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A detachable oxygen lance head, characterized in that: The oxygen lance includes an oxygen lance body (1), on which an oxygen channel (1-1) and a cooling water channel (1-2) are provided. The cooling water channel (1-2) surrounds the outer periphery of the oxygen channel (1-1). Two nitrogen channels (2) are symmetrically arranged inside the cooling water channel (1-2). A detachable nitrogen nozzle (3) is provided at the end of the nitrogen channel (2). The nitrogen nozzle (3) is fitted and fixed on the oxygen lance body (1). The nitrogen nozzle (3) is provided with a primary nitrogen blowing chamber (3-1) and a secondary nitrogen blowing chamber (3-2) separated by a partition (4) from the end upward. The nitrogen channel (2) can slide up and down and connect with the primary nitrogen blowing chamber (3-1) and the secondary nitrogen blowing chamber (3-2) to blow out nitrogen at different angles.

2. The detachable oxygen lance head according to claim 1, characterized in that: The two nitrogen channels (2) can slide up and down simultaneously or separately, and thus connect simultaneously or separately to the primary nitrogen blowing chamber (3-1) and / or the secondary nitrogen blowing chamber (3-2).

3. The detachable oxygen lance head according to claim 2, characterized in that: The oxygen lance body (1) is provided with a positioning platform (1-3) adapted to the partition (4), and the nitrogen lance head (3) clamps the partition (4) under the positioning platform (1-3).

4. A detachable oxygen lance head according to claim 3, characterized in that: The primary nitrogen blowing chamber (3-1) is shaped like an inverted frustum, with a larger top and a smaller bottom. Multiple rings of primary nitrogen blowing holes (3-1-1) are arranged in a circular array on the bottom surface of the primary nitrogen blowing chamber (3-1), and a ring of primary nitrogen blowing holes (3-1-1) is arranged in a circular array on the conical surface of the primary nitrogen blowing chamber (3-1).

5. A detachable oxygen lance head according to claim 4, characterized in that: All the primary nitrogen blowing holes (3-1-1) are inclined outward. The angle between the axis of the primary nitrogen blowing hole (3-1-1) on the bottom surface of the primary nitrogen blowing chamber (3-1) and the center line of the oxygen lance head is set between 5° and 30°. The angle between the axis of the primary nitrogen blowing hole (3-1-1) on the conical surface and the center line of the oxygen lance head is set between 40° and 60°.

6. A detachable oxygen lance head according to claim 3, characterized in that: The secondary nitrogen blowing chamber (3-2) is arranged in a circular array with a ring of secondary nitrogen blowing holes (3-2-1), and the inner port of the secondary nitrogen blowing hole (3-2-1) is located above the positioning platform (1-3).

7. A detachable oxygen lance head according to claim 6, characterized in that: The secondary nitrogen blowing hole (3-2-1) is inclined downward, and the angle between its axis and the center line of the oxygen lance head is set between 80° and 110°. Its outer port is set as an elongated oval hole extending upward.

8. A detachable oxygen lance head according to claim 5 or 7, characterized in that: A limiting plate (2-1) is provided at the lower end of the nitrogen channel (2), and a support column (2-2) is provided on the bottom surface of the limiting plate (2-1). The distance between the limiting plate (2-1) and the lower edge of the gas outlet of the nitrogen channel (2) is equal to or greater than the thickness of the partition plate (4).

9. A detachable oxygen lance head according to claim 8, characterized in that: The nitrogen nozzle (3) and the oxygen lance body (1) are provided with a matching thread, and the nitrogen nozzle (3) is fixed to the end of the oxygen lance body (1) by the thread.

10. A detachable oxygen lance head according to claim 9, characterized in that: The oxygen channel (1-1) has an oxygen blowing hole (1-1-1) integrally formed with the oxygen gun body (1) at its axial end.

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