Circular seam type converter bottom blowing air supply element

Abstract

The invention discloses a circular seam type converter bottom blowing gas supply element and a manufacturing method thereof, and aims to solve the problems of weak combination between a gas supply element and a refractory material, easy 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] The present application relates to the field of iron and steel metallurgical equipment, and in particular to the design and application of an annular gap type converter bottom blowing gas supply element. Background Art

[0002] Oxygen converter top and bottom combined blowing is a new technology and process developed in the world steelmaking field in the late 1970s. The converter bottom blowing gas supply component is an important part of the bottom blowing system for steel smelting. The combined blowing converter bottom blowing system has the advantages of improving metal recovery rate, reducing inclusions, and improving dephosphorization rate. In recent years, with the rapid development of top and bottom combined blowing technology in the converter steelmaking process, the structure and material of the bottom blowing gas supply component directly affect the life of the converter, stirring effect and economic benefits.

[0003] At present, there are two main structural forms of bottom blowing gas supply components used in converters at home and abroad, one is the directional porous gas supply component, and the other is the nozzle type and annular seam gas supply component. The directional multi-microtube type is the main type of gas supply component for bottom blowing of large and medium-sized converters and electric furnaces. This structure has the advantages of large gas supply volume, not easy to be blocked, gas supply components are not easy to peel off and crack, and have a long service life. It can also realize online hot replacement of gas supply components. The nozzle type is divided into single-tube type, sleeve type and annular seam type. The gas supply component of this structure has the advantages of small gas resistance, large gas supply volume, simple manufacturing process, etc., but because the ventilation steel pipe and the refractory matrix are combined during the manufacturing process, the bonding force between the two is weak. When the bottom blowing system is used for gas supply, it is easy for the steel pipe to be peeled off from the refractory matrix, resulting in the risk of steel leakage. Summary of the invention

[0004] The present application aims to provide an annular gap type converter bottom blowing gas supply element, by improving the structure of the gas supply element, improving the bonding strength between the gas supply element and the refractory material, reducing the risk of steel leakage and extending the service life.

[0005] The present application provides an annular gap type converter bottom blowing gas supply element, comprising an air inlet pipe (1), an air 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), characterized in that the gas supply element is an annular gap structure formed by the outer steel pipe (3) and the central steel pipe (4), and adopts points or ribs of stainless steel stacked cones to ensure the precise positioning of the gap width.

[0006] As a preferred solution of the present application, it is characterized in that the diameter of the outer steel pipe (3) is 18-22 mm and the wall thickness is 2-3 mm.

[0007] As a preferred solution of the present application, it is characterized in that the diameter of the central steel pipe (4) is 10-14 mm and the wall thickness is 1-2 mm.

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

[0009] As a preferred solution of the present application, it is characterized in that the annular seam structure is integrally formed with the magnesium carbon refractory material matrix (6).

[0010] As a preferred solution of the present application, it is characterized in that one end of the central steel pipe (4) passes through the air chamber (2), is fixedly connected to the air chamber (2), and is closed 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 solution of the present application, it is characterized in that the annular seam air passage is formed by an outer steel pipe (3) and a central steel pipe (4) to adjust the size of the bottom blowing ventilation volume.

[0012] As a preferred solution of the present application, it is 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 air supply volume.

[0013] As a preferred solution of the present application, it is characterized in that the integral molding of the magnesium carbon refractory material matrix (6) and the annular 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 operation.

[0014] The present application provides a method for manufacturing an annular gap type converter bottom blowing gas supply element, comprising the following steps:

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

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

[0017] c) using points or ribs of stainless steel cones to form an annular gap structure between the outer steel tube (3) and the central steel tube (4) to ensure accurate positioning of the gap width;

[0018] d) integrally forming the annular seam structure and the magnesia-carbon refractory matrix (6) to ensure that the outer steel pipe (3) and the central steel pipe (4) are tightly combined with the refractory matrix (6);

[0019] e) one end of the central steel pipe (4) is passed through the air chamber (2) and fixedly connected to the air chamber (2), and the air chamber (2) is sealed at the end, and the outer steel pipe (3) is welded to the air chamber (2) to form a stable air supply element structure;

[0020] f) By adjusting the width of the annular gap between the outer steel pipe (3) and the central steel pipe (4), accurate control of the bottom blowing ventilation volume can be achieved to meet the requirements of different steelmaking processes.

[0021] The technical solution of the present application adopts an annular seam structure formed by an outer steel pipe and a central steel pipe, ensures precise positioning of the gap width through points or ribs of a stainless steel cone, and is integrally formed with a magnesium-carbon refractory material matrix, thereby enhancing the stability and durability of the structure.

[0022] In addition, the inert gas in the annular gap plays a certain cooling role on the refractory material during hot operation, slowing down the erosion of the steel pipe, thereby increasing the service life of the gas supply components. By controlling the size of the annular gap between the inner and outer steel pipes, the bottom blowing ventilation volume 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) About the overall structure:

[0025] The annular gap type converter bottom blowing gas supply element of the present application comprises an air inlet pipe, an air chamber, an outer steel pipe, a central steel pipe, a central steel pipe filled with refractory material and a magnesium carbon refractory material matrix. The annular gap structure formed by the outer steel pipe and the central steel pipe uses points or ribs of stainless steel stack cones to ensure accurate positioning of the gap width, thereby achieving integral molding with the magnesium carbon refractory material matrix.

[0026] (2) About the design of the annular seam

[0027] The annular gap structure provides a stable and controllable airway. 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) About molding

[0029] The integral molding of the annular seam structure with the magnesium-carbon refractory matrix significantly improves the structural stability and durability of the gas supply element and reduces the risk of material peeling and damage under high temperature conditions.

[0030] (4) Cooling effect

[0031] The inert gas in the annular gap cools the refractory material during hot operation, effectively slowing down the erosion of the steel pipe and extending the service life of the gas supply components. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic structural diagram of the bottom blowing gas supply element of the annular gap type converter in this application.

[0033] Figure 2 This is a schematic cross-sectional structure diagram of the annular gap type converter bottom blowing gas supply element of the present application.

[0034] Figure 3 This is a schematic diagram of the cross-sectional structure of the annular gap structure of the annular gap type converter bottom blowing gas supply element of the present application.

[0035] Figure numerals: 1. air inlet pipe; 2. air chamber; 3. outer steel pipe; 4. central steel pipe; 5. central steel pipe filled with refractory material; 6. magnesium-carbon refractory material matrix. DETAILED DESCRIPTION

[0036] Embodiment 1:

[0037] A ring-gap converter bottom blowing gas supply element, the gas supply element comprising an air inlet pipe (1), an air chamber (2), an outer steel pipe (3), a central steel pipe (4), a central steel pipe filled with a refractory material (5), and a magnesia-carbon refractory material matrix (6).

[0038] The air supply element is an annular seam structure formed by an outer steel pipe (3) and a central steel pipe (4), and the points or ribs of a stainless steel cone are used to ensure the precise positioning of the gap width; the annular seam structure is integrally formed with a magnesium-carbon refractory material matrix (6); one end of the central steel pipe (4) passes through the air chamber, is fixedly connected to the air chamber (2), and is sealed at the end of the air chamber; the outer steel pipe (3) is welded to the air chamber (2); an annular seam airway is formed by the outer steel pipe (3) and the central steel pipe (4); and the air chamber (2) is welded to the air inlet pipe (1).

[0039] Embodiment 2:

[0040] On the basis of Example 1, the outer steel pipe diameter of the annular gap converter bottom blowing gas supply element is 20 mm, the wall thickness is 3 mm, the central steel pipe diameter is 12 mm, the wall thickness is 2 mm. The central steel pipe is filled with refractory materials to improve the heat resistance.

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

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

[0043] Embodiment 3:

[0044] In order to adapt to the higher temperature steelmaking environment, the refractory material of the central steel pipe is made of high-grade magnesium carbon refractory material. The outer steel pipe diameter is 22mm, the wall thickness is increased to 3mm, the central steel pipe diameter remains at 12mm, but the wall thickness is increased to 2.5mm. The annular seam width is adjusted to 1.5mm through the designed stainless steel stack cone point or rib to provide more precise gas flow control.

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

[0046] Embodiment 4:

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

[0048] This solution is particularly suitable for high-flexibility steelmaking processes that require frequent adjustment of the bottom blowing gas volume.

[0049] In the traditional technical solution, the nozzle-type gas supply element is composed of a single steel pipe, and the outside of the steel pipe is directly covered with refractory material. Although the manufacturing process is simple, this design is prone to peeling between the refractory material and the steel pipe during high-temperature operation, increasing the risk of steel leakage and making it difficult to accurately control the gas flow.

[0050] Beneficial effects of this application

[0051] (1) The test results of the embodiment show that the gas supply element formed by the annular gap structure and the magnesium-carbon refractory material matrix as a whole has significantly improved structural stability and durability compared with the traditional nozzle-type gas supply element. Under the same steelmaking conditions, the service life of the gas supply element of the present application is effectively extended.

[0052] (2) Since the gas supply element of the present application is more tightly combined with the refractory material, the possibility of peeling between the refractory material and the steel pipe during high-temperature operation is greatly reduced, thereby effectively reducing the risk of steel leakage. In multiple high-temperature experiments, the gas supply element of the present application did not experience steel leakage.

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

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

[0055] The annular gap type converter bottom blowing gas supply element of the present application is only applicable to medium and small converters.

Claims

1. An annular gap type converter bottom blowing gas supply element, comprising an air inlet pipe (1), an air chamber (2), an outer steel pipe (3), a central steel pipe (4), a central steel pipe filled with a refractory material (5) and a magnesia carbon refractory material matrix (6), characterized in that: The air supply element is an annular gap structure formed by an outer steel pipe (3) and a central steel pipe (4), and uses points or ribs of stainless steel cones to ensure accurate positioning of the gap width.

2. The annular gap type converter bottom blowing gas supply element according to claim 1, characterized in that: The outer steel pipe (3) has a diameter of 18-22 mm and a wall thickness of 2-3 mm.

3. The annular gap type converter bottom blowing gas supply element according to claim 1, characterized in that: The diameter of the central steel pipe (4) is 10-14 mm, and the wall thickness is 1-2 mm.

4. The annular gap type converter bottom blowing gas supply element according to claim 1, characterized in that: The interior of the central steel pipe (4) is filled with refractory material (5).

5. The annular gap type converter bottom blowing gas supply element according to claim 1, characterized in that: The annular seam structure is integrally formed with the magnesium-carbon refractory material matrix (6).

6. The annular gap type converter bottom blowing gas supply element according to claim 1, characterized in that: One end of the central steel pipe (4) passes through the air chamber (2), 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).

7. The annular gap type converter bottom blowing gas supply element according to claim 1, characterized in that: The annular gap ventilation channel is formed by an outer steel pipe (3) and a central steel pipe (4) to adjust the bottom blowing ventilation volume.

8. The annular gap type converter bottom blowing gas supply element 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 air supply volume.

9. The annular gap type converter bottom blowing gas supply element according to claim 1, characterized in that: The integral formation of the magnesium-carbon refractory material matrix (6) and the annular seam structure improves the overall strength and heat resistance of the gas supply element and reduces the risk of material stripping and damage during high-temperature operation.

10. A method for manufacturing an annular gap type converter bottom blowing gas supply element, comprising the following steps: a) providing an outer steel tube (3) and a central steel tube (4), wherein the outer steel tube (3) has a diameter of 18-22 mm and a tube wall thickness of 2-3 mm, and the central steel tube (4) has a diameter of 10-14 mm and a tube wall thickness of 1-2 mm; b) filling the interior of the central steel pipe (4) with refractory material (5); c) using stainless steel cone points or ribs to form an annular gap structure between the outer steel tube (3) and the central steel tube (4) to ensure accurate positioning of the gap width; d) integrally forming the annular seam structure and the magnesia-carbon refractory matrix (6) to ensure that the outer steel pipe (3) and the central steel pipe (4) are tightly combined with the refractory matrix (6); e) one end of the central steel pipe (4) is passed through the air chamber (2) and fixedly connected to the air chamber (2), and the air chamber (2) is sealed at the end, and the outer steel pipe (3) is welded to the air chamber (2) to form a stable air supply element structure; f) By adjusting the width of the annular 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 requirements of different steelmaking processes.

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