A ladle roaster

Abstract

The utility model belongs to the steel ladle roaster in the steel smelting technical field. The flame spray gun (2) is set close to the steel ladle (1), the flame spray gun (2) extends from the ladle mouth (3) outside to the steel ladle (1) inside, the flame spray gun (2) extends to the direction close to the ladle bottom (4), the flame spray gun (2) includes the spray gun inner layer pipe (5) and spray gun outer layer pipe (6), the cavity in the spray gun inner layer pipe (5) is the flame pipeline (7), the cavity between spray gun outer layer pipe (6) and spray gun inner layer pipe (5) is water cooling chamber (8). The steel ladle roaster, simple structure, through partial structure improvement, realizes the expansion of the flame core area coverage range, ensures the ladle bottom roasting in place, reduces the heat loss simultaneously, improves the smelting quality.

Description

Technical Field

[0001] This utility model belongs to the field of iron and steel smelting technology, and more specifically, it relates to a ladle baking device. Background Technology

[0002] Ladle baking is a crucial step in the steelmaking process, directly affecting the quality of molten steel and the smooth progress of continuous casting. In existing steelmaking processes, horizontal ladle bakers are widely used; however, they have revealed numerous problems in practical application. Traditional horizontal ladle bakers have certain design limitations. The flame outlet is located at the ladle opening, and due to the gap between the ladle opening and the baker cover, a large amount of heat is lost through this gap, significantly reducing thermal efficiency. Moreover, this structure results in good baking in the ladle opening area, but the bottom of the ladle is often not properly baked. Insufficient bottom temperature can lead to a series of serious consequences, such as the tendency for cold steel to form on the ladle bottom. This not only affects the quality of molten steel pouring but may also cause flow problems during continuous casting, posing significant safety hazards and economic losses to the entire steelmaking production. The shortcomings of existing technology are: 1. Low thermal efficiency: The flame outlet of the horizontal ladle baker is located at the ladle opening, and the gap between the ladle opening and the baker cover causes a large amount of heat loss, reducing the thermal efficiency of the flame and increasing energy consumption. 2. Uneven baking: The bottom of the ladle requires a higher temperature than the mouth, but existing facilities do not provide sufficient baking intensity for the bottom, resulting in the bottom temperature not reaching the required level and affecting the quality of the molten steel. 3. Safety hazards: Inadequate baking of the bottom can easily lead to cold steel forming on the bottom, potentially causing continuous casting run-through accidents and threatening production safety.

[0003] Existing technology includes a device called "Flame Gun" with publication number "CN208920056U". This technology relates to the field of flame heating devices, specifically a flame gun comprising a handle with a barrel connected to it. The barrel includes a fixed tube and a movable tube. The fixed tube is connected to the handle, and the movable tube is connected to the fixed tube via a flexible hose. An adjustment component is provided between the fixed tube and the movable tube to maintain a constant angle between them. By connecting the fixed tube and the movable tube with the flexible hose, the movable tube can move and rotate, and is fixed in place by the adjustment component, maintaining a constant angle with the fixed tube. This allows the flame gun barrel to be bent and adjusted to adapt to different working conditions, improving hand comfort and facilitating heat-melt bonding of waterproof membranes with different laying angles and slopes during installation. This technology does not address the technical problems or solutions of this application. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a ladle baker with a simple structure that, through local structural improvements, expands the coverage area of ​​the flame core region, ensures proper baking of the ladle bottom, reduces heat loss, and improves smelting quality, thus addressing the shortcomings of the existing technology.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] This utility model is a ladle baking device, with a flame spray gun installed near the ladle. The flame spray gun extends from the outside of the ladle opening to the inside of the ladle and extends towards the bottom of the ladle. The flame spray gun includes an inner tube and an outer tube. The cavity inside the inner tube is a flame conduit, and the cavity between the outer tube and the inner tube is a water cooling cavity.

[0007] The flame gun is mounted on the cover of the ladle, which is located outside the ladle.

[0008] The distance from the mouth of the flame gun to the inside of the ladle is L1, and the distance from the front of the ladle to the bottom of the ladle is L2, where L1 is greater than or equal to one-third of L2.

[0009] The flame gun extends along the centerline of the ladle into the ladle.

[0010] The inner tube of the spray gun is made of high-temperature resistant alloy and has a tapered structure. The inner diameter of the outlet section of the inner tube is smaller than the inner diameter of the body section of the inner tube.

[0011] The outer tube of the spray gun is made of stainless steel.

[0012] The body section of the flame gun is connected to the flange of the combustion gas supply pipeline via a flange.

[0013] The outer tube of the spray gun is equipped with a cooling water inlet and a cooling water outlet.

[0014] The section of the flame gun extending from the front of the ladle into the ladle is a tapering section, and the end of the flame gun located outside the ladle is the main body section.

[0015] The flame gun is arranged horizontally, and the flame emitted by the flame gun is aimed at the bottom of the bag.

[0016] The working principle and beneficial effects of this utility model are as follows:

[0017] The ladle baking device of this utility model incorporates several structural improvements, including: 1. Extended spray gun structure: The flame spray gun extends into the ladle, towards the bottom. According to thermodynamic analysis, the flame jet distance is positively correlated with the ladle bottom temperature. Experiments show that when the flame spray gun extends into the ladle to one-third of the distance from the ladle opening to the bottom, the flame core area can cover the bottom area. The flame is ejected from a position close to the center of the ladle, avoiding direct impact on the ladle wall and preventing localized overheating. Through the structural arrangement of the flame spray gun within the ladle, the high-temperature heat radiated from the flame is diffused towards the bottom, expanding the coverage area of ​​the flame core area. Furthermore, some heat from the flame spray gun outlet extends towards the ladle opening, ensuring reliable heat protection towards the opening as well. Fluid simulation verification shows that the extended flame spray gun structure of this utility model creates a stable vortex within the ladle, extending the residence time of the high-temperature flue gas and improving thermal efficiency. 2. Water-cooled flame gun: The inner layer of the flame gun is a flame tube for spraying flames. The cavity between the outer tube and the inner tube is a water-cooling cavity. Cooling water is introduced into the water-cooling cavity to realize the supply and discharge of cold water, realize heat exchange, ensure that the flame gun does not get too hot, and ensure that the flame gun can work stably for a long time in high-temperature environments. Attached Figure Description

[0018] The following is a brief explanation of the contents depicted in the accompanying drawings and the markings therein:

[0019] Figure 1 This is a schematic diagram of the steel ladle baking device described in this utility model;

[0020] Figure 2 This is a cross-sectional view of the flame torch of the ladle baking device described in this utility model.

[0021] Reference numerals: 1. Ladle; 2. Flame torch; 3. Ladle opening; 4. Ladle bottom; 5. Inner tube of the torch; 6. Outer tube of the torch; 7. Flame pipe; 8. Water-cooled cavity; 9. Ladle cover; 10. Centerline of the ladle; 11. Cooling water inlet; 12. Cooling water outlet; 13. Body section; 14. Flange; 15. Combustion gas supply pipeline; 16. Recessed section; 17. Flame. Detailed Implementation

[0022] The following description, with reference to the accompanying drawings, provides a more detailed explanation of the specific embodiments of this utility model, including the shape and structure of each component, the relative positions and connections between the parts, the functions and working principles of each part:

[0023] As attached Figure 1 - Appendix Figure 2As shown, this utility model is a ladle baking device. A flame torch 2 is installed near the ladle 1, extending from the outside of the ladle opening 3 into the interior of the ladle 1. The flame torch 2 extends towards the bottom of the ladle 4. The flame torch 2 includes an inner tube 5 and an outer tube 6. The cavity inside the inner tube 5 is a flame conduit 7, and the cavity between the outer tube 6 and the inner tube 5 is a water-cooling chamber 8. To address the shortcomings of existing technologies, an improved technical solution is proposed. Several structural improvements are made, including: 1. Extending the torch structure: The flame torch 2 extends into the interior of the ladle 1, towards the bottom of the ladle 4. According to thermodynamic analysis, the flame jet distance is positively correlated with the temperature of the bottom of the ladle 4. Experiments show that when the flame gun 2 extends into the ladle 1 to a length equal to one-third of the distance from the ladle opening 3 to the bottom 4 (1.5 meters for a 4.5-meter ladle), the flame core area can cover the bottom 4 area (temperature ≥1100℃). The flame exits from a position close to the center of the ladle 1, avoiding direct impact on the ladle wall and preventing localized overheating. Through the structural arrangement of the flame gun in the ladle 1, the flame emitted by the flame gun 2 generates high-temperature heat radiation that diffuses towards the bottom 4, expanding the coverage area of ​​the flame core area (bottom area temperature ≥1100℃). Furthermore, some of the heat from the flame gun 2 outlet extends towards the ladle opening 3, ensuring reliable heat protection in that direction as well. Fluid simulation verification shows that the structure of the flame gun 2 extending into the ladle 1 allows the high-temperature flue gas to form a stable vortex inside the ladle 1, extending the residence time of the high-temperature flue gas to 8-10 seconds (originally 3-5 seconds), and improving thermal efficiency by 20%-25%. 2. Water-cooled flame torch: The inner layer of the flame torch 2 is a flame pipe 7 for spraying flames. The cavity between the outer tube 6 and the inner tube 5 is a water-cooling chamber 8, through which cooling water is supplied and discharged to achieve heat exchange, ensuring that the flame torch 2 does not overheat and ensuring long-term stable operation of the torch at 1200℃. The ladle baking device described in this utility model has a simple structure. Through local structural improvements, the coverage area of ​​the flame core region is expanded, ensuring that the bottom of the ladle is baked in place, while reducing heat loss and improving smelting quality.

[0024] The flame gun 2 is mounted on the cover 9, which is located outside the ladle 1. This structure ensures a reliable connection between the flame gun and the cover, guaranteeing reliable flame delivery. The cover, located outside the ladle and close to the ladle opening, acts as a shield, preventing heat loss.

[0025] As attached Figure 2As shown, the distance from the ladle opening 3 to the inside of the ladle 1 is L1, and the distance from the front of the ladle to the bottom 4 is L2, where L1 ≥ one-third of L2. This structure controls the distance the flame gun extends into the ladle. When the flame gun extends into the ladle to one-third of the distance from the ladle opening to the bottom, the core flame area can effectively cover the bottom area (temperature ≥1100℃), avoiding inadequate baking of the bottom and improving smelting quality.

[0026] The flame gun 2 extends along the center line 10 of the ladle into the interior of the ladle 1. The flame gun 2 is horizontally arranged, and the flame 17 emitted by the flame gun 2 is aimed at the bottom 4 of the ladle.

[0027] The inner tube 5 of the spray gun is made of a high-temperature resistant alloy, specifically Cr25Ni20. The inner tube 5 has a tapered structure, with the inner diameter of the outlet section being smaller than the inner diameter of the body section 13. The outer tube 6 of the spray gun is made of stainless steel, specifically SUS304. This double-layer structure of the flame spray gun allows for both flame jetting and water cooling. The inner tube 5 is made of a high-temperature resistant alloy (Cr25Ni20), and the outer tube 6 is made of stainless steel (SUS304). Circulating cooling water flows through the water-cooling chamber between the two layers.

[0028] The body section 13 of the flame torch 2 is connected to the flange 14 of the combustion gas supply pipeline 15 via a flange 14. In this structure, the flame torch is a fixed installation structure, rigidly connected to the combustion gas supply pipeline 15 via the flange, ensuring a reliable gas supply and guaranteeing that the flame torch can reliably ignite the gas for flame projection. The flame torch 2 is installed at a horizontal angle, ensuring that the projected flame 17 points directly to the center of the bottom 4.

[0029] The outer tube 6 of the spray gun is provided with a cooling water inlet 11 and a cooling water outlet 12. With this structure, the cooling water circulates to achieve continuous heat exchange and maintain reliable cooling.

[0030] The flame gun 2 extends from the front of the ladle 1 into the ladle 1, forming a tapered section 16. The end of the flame gun 2 located outside the ladle 1 is the main body section 13. In this structure, the tapered section 16 is configured such that, for example, the inner diameter of the outlet section of the tapered section 16 is 30 mm, and the inner diameter of the inlet section of the tapered section 16 is 50 mm, to effectively increase the flame jet speed.

[0031] The ladle baking device of this utility model incorporates several structural improvements, including: 1. Extended spray gun structure: The flame spray gun 2 extends into the ladle 1, towards the bottom 4. According to thermodynamic analysis, the flame spray distance is positively correlated with the temperature of the bottom 4. Experiments show that when the flame spray gun 2 extends into the ladle 1 to one-third of the distance from the ladle opening 3 to the bottom 4 (1.5 meters for a 4.5-meter ladle), the flame core area can cover the bottom 4 area (temperature ≥1100℃). The flame is ejected from a position close to the center of the ladle 1, avoiding direct impact on the ladle wall and preventing localized overheating. Through the structural arrangement of the flame spray gun in the ladle 1, the flame emitted by the flame spray gun 2 generates high-temperature heat radiation that diffuses towards the bottom 4, expanding the coverage area of ​​the flame core area (bottom area temperature ≥1100℃). Furthermore, some of the heat from the flame spray gun 2 outlet extends towards the ladle opening 3, ensuring reliable heat protection towards the opening 3 as well. Fluid simulation verification shows that the structure of the flame gun 2 extending into the ladle 1 of this invention can form a stable vortex of high-temperature flue gas inside the ladle 1, extending the residence time of the high-temperature flue gas to 8-10 seconds (originally 3-5 seconds), and improving thermal efficiency by 20%-25%. 2. Water-cooled flame gun: The inner layer of the flame gun 2 is a flame pipe 7 for spraying flames. The cavity between the outer tube 6 and the inner tube 5 of the flame gun is a water-cooling chamber 8. Cooling water is introduced into the water-cooling chamber 8 to realize the supply and discharge of cold water, achieve heat exchange, ensure that the flame gun 2 does not overheat, and ensure that the flame gun can work stably for a long time in a high-temperature environment of 1200℃.

[0032] The present invention has been described above with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any improvements made using the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A ladle baking oven, characterized in that: A flame gun (2) is installed near the ladle (1). The flame gun (2) extends from the outside of the ladle opening (3) to the inside of the ladle (1). The flame gun (2) extends towards the bottom of the ladle (4). The flame gun (2) includes an inner tube (5) and an outer tube (6). The cavity inside the inner tube (5) is a flame conduit (7). The cavity between the outer tube (6) and the inner tube (5) is a water cooling cavity (8).

2. The ladle baking apparatus according to claim 1, characterized in that: The flame gun (2) is mounted on the cover (9), which is located outside the steel ladle (1).

3. The ladle baking apparatus according to claim 1 or 2, characterized in that: The distance from the mouth (3) of the flame gun (2) to the inside of the ladle (1) is L1, and the distance from the front of the ladle to the bottom (4) is L2, where L1 is greater than or equal to one-third of L2.

4. The ladle baking apparatus according to claim 1 or 2, characterized in that: The flame gun (2) extends along the center line (10) of the ladle into the ladle (1).

5. The ladle baking apparatus according to claim 1 or 2, characterized in that: The inner tube (5) of the spray gun is made of high temperature resistant alloy and has a tapered structure. The inner diameter of the outlet section of the inner tube (5) is smaller than the inner diameter of the body section (13) of the inner tube (5).

6. The ladle baking apparatus according to claim 1 or 2, characterized in that: The outer tube (6) of the spray gun is made of stainless steel.

7. The ladle baking apparatus according to claim 5, characterized in that: The body section (13) of the flame gun (2) is connected to the flange (14) of the combustion gas supply pipeline (15) via a flange (14).

8. The ladle baking apparatus according to claim 1 or 2, characterized in that: The outer tube (6) of the spray gun is provided with a cooling water inlet (11) and a cooling water outlet (12).

9. The ladle baking apparatus according to claim 5, characterized in that: The section of the flame gun (2) extending from the front of the ladle to the inside of the ladle (1) is a tapered section (16), and the end of the flame gun (2) located outside the ladle (1) is a body section (13).

10. The ladle baking apparatus according to claim 1 or 2, characterized in that: The flame gun (2) is arranged horizontally, and the flame (17) emitted by the flame gun (2) is aimed at the bottom of the bag (4).

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