Circular seam type converter bottom blowing air supply element

Abstract

The utility model discloses a circular seam type converter bottom blowing gas supply element, and aims to solve the problems of weak combination between a gas supply element and a refractory material, easiness in stripping and high bleed-out risk in the prior art. The gas supply element consists of a gas inlet pipe, a gas chamber, an outer-layer steel pipe, a central steel pipe, a refractory material filled in the central steel pipe and a magnesia carbon refractory material base body, and is particularly characterized in that a circular seam structure formed by the outer-layer steel pipe and the central steel pipe ensures accurate positioning of the width of a seam through points or ribs of a stainless steel pile cone. In addition, the circular seam structure and the magnesia-carbon refractory material base body are integrally formed, so that the structural stability and durability of the gas supply element are remarkably improved, and the steel leakage risk is reduced.

Description

Technical Field

[0001] This application relates to the field of iron and steel metallurgical equipment, and in particular to the design and application of a bottom-blowing gas supply element for an annular slotted converter. Background Technology

[0002] Oxygen converter top and bottom combined blowing is a new technology and process developed in the global steelmaking field in the late 1970s. Bottom blowing gas supply elements are an important component of the bottom blowing system in steelmaking. Combined blowing converter bottom blowing systems have advantages such as improved metal yield, reduced inclusions, and increased dephosphorization rate. In recent years, with the rapid development of top and bottom combined blowing technology in converter steelmaking, the structure and material of the bottom blowing gas supply elements directly affect the converter's lifespan, stirring effect, and economic benefits.

[0003] Currently, there are two main structural forms of bottom-blowing gas supply elements used in converters both domestically and internationally: directional multi-hole gas supply elements and nozzle-type and annular-slit-type gas supply elements. The directional multi-hole type is the main type of gas supply element used in bottom-blowing of large and medium-sized converters and electric furnaces. This structure has advantages such as large gas supply volume, resistance to clogging, resistance to peeling and cracking of the gas supply element, and long service life. It also allows for online hot replacement of the gas supply element. The nozzle type is divided into single-tube, sleeve-type, and annular-slit type. This structure has advantages such as low gas resistance, large gas supply volume, and simple manufacturing process. However, because the gas pipe and the refractory matrix are combined during manufacturing, the bonding force between them is weak. During bottom-blowing system gas supply, the steel pipe is prone to peeling off from the refractory matrix, leading to the risk of steel leakage. Summary of the Invention

[0004] This application aims to provide a bottom-blowing gas supply element for an annular slotted converter. By improving the structure of the gas supply element, its bonding strength with refractory materials is enhanced, reducing the risk of steel leakage and extending its service life.

[0005] This application provides a bottom-blown gas supply element for a circumferentially slit converter, comprising an inlet pipe (1), a gas chamber (2), an outer steel pipe (3), a central steel pipe (4), a refractory material (5) filling the central steel pipe, and a magnesia-carbon refractory material matrix (6). The gas supply element is characterized by a circumferentially slit structure formed by the outer steel pipe (3) and the central steel pipe (4), and the use of stainless steel stacked cones or ribs to ensure precise positioning of the slit width.

[0006] As a preferred embodiment of this application, the outer steel pipe (3) has a diameter of 18-22 mm and a wall thickness of 2-3 mm.

[0007] As a preferred embodiment of this application, the central steel pipe (4) has a diameter of 10-14 mm and a wall thickness of 1-2 mm.

[0008] As a preferred embodiment of this application, the central steel pipe (4) is characterized in that it is filled with refractory material (5).

[0009] As a preferred embodiment of this application, the circumferential seam structure is integrally formed with the magnesia-carbon refractory matrix (6).

[0010] As a preferred embodiment of this application, the central steel pipe (4) is characterized in that one end of the central steel pipe (4) passes through the air chamber (2) and is fixedly connected to the air chamber (2), and is sealed at the end of the air chamber (2), and the outer steel pipe (3) is welded to the air chamber (2).

[0011] As a preferred embodiment of this application, the circumferential vent is characterized in that the vent is formed by an outer steel pipe (3) and a central steel pipe (4) to adjust the amount of bottom blowing ventilation.

[0012] As a preferred embodiment of this application, the stainless steel cone has points or ribs used to ensure precise positioning of the gap width, thereby achieving precise control of the gas supply.

[0013] As a preferred embodiment of this application, the integral molding of the magnesium-carbon refractory matrix (6) and the circumferential seam structure improves the overall strength and heat resistance of the gas supply element and reduces the risk of material peeling and damage during high-temperature operations.

[0014] This application provides a method for manufacturing a bottom-blowing gas supply element for an annular slotted converter, comprising the following steps:

[0015] a) Provide an outer steel pipe (3) and a central steel pipe (4), wherein the outer steel pipe (3) has a diameter of 18-22 mm and a wall thickness of 2-3 mm, and the central steel pipe (4) has a diameter of 10-14 mm and a wall thickness of 1-2 mm;

[0016] b) Fill the interior of the central steel pipe (4) with refractory material (5);

[0017] c) Use stainless steel stacked cones or ribs to form a ring gap structure between the outer steel pipe (3) and the central steel pipe (4) to ensure the precise positioning of the gap width.

[0018] d) The circumferential seam structure is integrally formed with the magnesia-carbon refractory matrix (6) to ensure that the outer steel pipe (3) and the central steel pipe (4) are tightly bonded to the refractory matrix (6);

[0019] e) Pass one end of the central steel pipe (4) through the air chamber (2) and fix it to the air chamber (2), and seal the end of the air chamber (2). Weld the outer steel pipe (3) to the air chamber (2) to form a stable gas supply element structure.

[0020] f) By adjusting the width of the circumferential gap between the outer steel pipe (3) and the central steel pipe (4), the bottom blowing ventilation volume can be precisely controlled to meet the needs of different steelmaking processes.

[0021] The technical solution of this application adopts a ring-shaped structure formed by an outer steel pipe and a central steel pipe. The precise positioning of the gap width is ensured by the points or ribs of the stainless steel stacked cone. It is integrally formed with the magnesia-carbon refractory material matrix, which enhances the stability and durability of the structure.

[0022] Furthermore, the inert gas in the annular gap plays a certain cooling role for the refractory material during hot operations, slowing down the corrosion of the steel pipe and thus improving the service life of the gas supply element. By controlling the size of the annular gap between the inner and outer steel pipes, the bottom blowing ventilation can be effectively adjusted to meet the needs of different steelmaking conditions.

[0023] Compared with the prior art, the technical solution of this application has the following technical effects:

[0024] (1) Regarding the overall structure:

[0025] The circumferential seam converter bottom-blowing gas supply element of this application includes an inlet pipe, a gas chamber, an outer steel pipe, a central steel pipe, and a refractory material and magnesia-carbon refractory material matrix filled in the central steel pipe. The circumferential seam structure formed by the outer steel pipe and the central steel pipe uses stainless steel stacked cones to ensure the precise positioning of the seam width, achieving integral forming with the magnesia-carbon refractory material matrix.

[0026] (2) Regarding the design of the circumferential seam

[0027] The annular gap structure provides a stable and controllable ventilation channel. By adjusting the width of the annular gap, the gas flow rate can be precisely controlled to meet the needs of different steelmaking processes.

[0028] (3) Regarding molding

[0029] By integrally molding the circumferential seam structure with the magnesia-carbon refractory matrix, the structural stability and durability of the gas supply element are significantly improved, and the risk of material peeling and damage under high-temperature conditions is reduced.

[0030] (4) Regarding the cooling effect

[0031] The inert gas in the circumferential seam cools the refractory material during hot operations, effectively slowing down the corrosion of the steel pipe and extending the service life of the gas supply components. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the bottom-blowing gas supply element for the annular slot converter in this application.

[0033] Figure 2 This is a cross-sectional view of the bottom-blowing gas supply element of the circumferential seam converter in this application.

[0034] Figure 3 This is a schematic cross-sectional view of the annular seam structure of the bottom-blown gas supply element of the annular seam converter in this application.

[0035] Reference numerals: 1. Inlet pipe; 2. Air chamber; 3. Outer steel pipe; 4. Central steel pipe; 5. Refractory material filling the central steel pipe; 6. Magnesia-carbon refractory matrix. Detailed Implementation

[0036] Example 1:

[0037] A bottom-blown gas supply element for an annular slotted converter, the gas supply element being composed of an inlet pipe (1), a gas chamber (2), an outer steel pipe (3), a central steel pipe (4), a central steel pipe filled with refractory material (5), and a magnesia-carbon refractory material matrix (6).

[0038] The gas supply element is a ring-shaped structure formed by an outer steel pipe (3) and a central steel pipe (4). The points or ribs of stainless steel stacked cones are used to ensure the precise positioning of the gap width. The ring-shaped structure is integrally formed with the magnesia-carbon refractory material matrix (6). One end of the central steel pipe (4) passes through the gas chamber and is fixedly connected to the gas chamber (2), and is sealed at the end of the gas chamber. The outer steel pipe (3) is welded to the gas chamber (2). The outer steel pipe (3) and the central steel pipe (4) form a ring-shaped air passage. The gas chamber (2) is welded to the air inlet pipe (1).

[0039] Example 2:

[0040] Based on Example 1, the outer steel pipe of the bottom-blown gas supply element of the annular slotted converter has a diameter of 20mm and a wall thickness of 3mm; the central steel pipe has a diameter of 12mm and a wall thickness of 2mm. The interior of the central steel pipe is filled with refractory material to improve its heat resistance.

[0041] By using the points or ribs of the stainless steel stacking cone, the circumferential gap width is precisely set to 2mm, ensuring uniform gas flow and excellent fire resistance.

[0042] This scheme is suitable for medium-scale converter steelmaking operations and can effectively improve metal yield and dephosphorization efficiency.

[0043] Example 3:

[0044] To withstand the higher temperatures of steelmaking, the refractory material of the central steel tube is made of high-grade magnesia-carbon refractory. The outer steel tube has a diameter of 22mm and a wall thickness increased to 3mm, while the central steel tube maintains a diameter of 12mm but has a wall thickness increased to 2.5mm. The circumferential seam width is adjusted to 1.5mm using designed stainless steel taper points or ribs to provide finer gas flow control.

[0045] This embodiment is particularly suitable for high-temperature, high-intensity steelmaking operations, providing a longer service life and better economic benefits.

[0046] Example 4:

[0047] This embodiment provides a design with an adjustable circumferential gap width. The outer steel pipe and the central steel pipe are connected by a special mechanical device, allowing adjustment of the circumferential gap width under different operating conditions. The outer steel pipe has a diameter of 18mm and a wall thickness of 2.5mm; the central steel pipe has a diameter of 10mm and a wall thickness of 1.5mm. By rotating or moving the position of the central steel pipe relative to the outer steel pipe, the circumferential gap width can be adjusted from 1mm to 3mm, thereby precisely controlling the gas flow rate and distribution.

[0048] This approach is particularly suitable for highly flexible steelmaking processes that require frequent adjustments to the bottom-blown gas volume.

[0049] In traditional technical solutions, nozzle-type gas supply elements consist of a single steel pipe directly covered with refractory material. Although the manufacturing process is simple, this design is prone to delamination between the refractory material and the steel pipe during high-temperature operations, increasing the risk of steel leakage and making it difficult to accurately control the gas flow rate.

[0050] Beneficial effects of this application

[0051] (1) Test results from the embodiments show that the gas supply element, which is integrally formed with a circumferential seam structure and a magnesia-carbon refractory matrix, has significantly improved structural stability and durability compared to traditional nozzle-type gas supply elements. Under the same steelmaking conditions, the service life of the gas supply element of this application is effectively extended.

[0052] (2) Because the gas supply element of this application is more tightly bonded to the refractory material, the possibility of peeling between the refractory material and the steel pipe during high-temperature operations is greatly reduced, thereby effectively reducing the risk of steel leakage. In multiple high-temperature tests, the gas supply element of this application did not exhibit any steel leakage.

[0053] (3) With the adjustable annular gap width, the operator can precisely control the gas flow and distribution according to the specific needs of steelmaking, which is difficult to achieve in traditional nozzle-type gas supply elements. This precise control can improve the efficiency and quality of steelmaking, and reduce energy consumption and waste of raw materials.

[0054] (4) Although the gas supply element of this application has a slightly higher manufacturing cost than the traditional nozzle-type gas supply element, its overall economic benefits far exceed those of the traditional solution in the long run due to the significant improvements it brings in terms of service life, maintenance costs, steelmaking efficiency, and product quality. This includes savings in terms of reduced maintenance costs, increased production efficiency, and improved product quality.

[0055] The circumferential seam converter bottom blowing gas supply element of this application is only applicable to medium and small converters.

Claims

1. A bottom-blown gas supply element for an annular slotted converter, comprising an inlet pipe (1), a gas chamber (2), an outer steel pipe (3), a central steel pipe (4), a central steel pipe filled with refractory material (5), and a magnesia-carbon refractory matrix (6), characterized in that, The gas supply element is a ring-shaped structure formed by an outer steel pipe (3) and a central steel pipe (4), and stainless steel stacked cones are used to ensure the precise positioning of the gap width. The outer steel pipe (3) has a diameter of 18-22 mm and a wall thickness of 2-3 mm; The diameter of the central steel pipe (4) is 10-14 mm, and the wall thickness is 1-2 mm; The central steel pipe (4) is filled with refractory material (5); One end of the central steel pipe (4) passes through the air chamber (2) and is fixedly connected to the air chamber (2), and is sealed at the end of the air chamber (2). The outer steel pipe (3) is welded to the air chamber (2).

2. The bottom-blowing gas supply element for an annular slotted converter according to claim 1, characterized in that, The circumferential seam structure is integrally formed with the magnesium-carbon refractory matrix (6).

3. The bottom-blowing gas supply element for an annular slotted converter according to claim 1, characterized in that, The circumferential vent is formed by an outer steel pipe (3) and a central steel pipe (4) to adjust the amount of bottom blowing ventilation.

4. The bottom-blowing gas supply element for an annular slotted converter according to claim 1, characterized in that, The points or ribs of the stainless steel cone are used to ensure the precise positioning of the gap width, thereby achieving precise control of the gas supply.

5. The bottom-blowing gas supply element for an annular slotted converter according to claim 1, characterized in that, The magnesia-carbon refractory matrix (6) is integrally formed with the circumferential seam structure.

Images