A submerged ladle roasting device

Abstract

The utility model discloses a kind of submerged ladle roasting devices, including cylinder and combustor;Cylinder includes the cylinder body submerged in ladle, the top end of cylinder body outwardly extends and is in the mouth edge of ladle above the cylinder top edge, the lateral wall and cylinder top edge of cylinder body are all hollow, the inner chamber of cylinder body lateral wall is communicated with the inner chamber of cylinder top edge and is combined to form the inner chamber of cylinder, the inner chamber in cylinder is equipped with partition plate, one end of partition plate is sealedly connected with the lateral wall of cylinder top edge and another end is spaced a certain distance with the bottom wall of cylinder body, partition plate divides the inner chamber of cylinder into first cavity and second cavity, cylinder top edge is equipped with air inlet channel communicated with first cavity, cylinder is equipped with multiple heat exchange pipes, one end of each heat exchange pipe is communicated with second cavity and another end is communicated with the air inlet cavity in combustor arranged on the bottom wall of cylinder body, the gap between cylinder top edge and the mouth edge of ladle forms smoke exhaust passage.Can improve the preheating efficiency of combustion-supporting air, and system integration is high.

Description

Technical Field

[0001] This utility model belongs to the field of metallurgical equipment technology, specifically relating to an immersion ladle baking device. Background Technology

[0002] In the iron and steel metallurgical production process, the ladle, as the core container for holding, transporting, and pouring high-temperature molten steel, is typically lined with refractory materials. Ladle baking is a crucial preparatory step before the ladle is put into service. The main purpose of this step is twofold: firstly, to heat the ladle lining with a high-temperature flame generated by a burner. This thoroughly removes moisture and crystal water absorbed by the refractory material during construction and storage, preventing instantaneous vaporization upon contact with molten steel that could cause lining bursting or molten steel splashing. Secondly, it preheats the ladle lining to a specific high temperature, significantly reducing the initial temperature drop when high-temperature molten steel is poured into a cold ladle, thereby ensuring the smooth operation of the continuous casting process and the stability of the molten steel quality.

[0003] While existing ladle baking equipment can basically meet baking requirements in long-term engineering practice, it still has significant shortcomings in terms of system thermal efficiency and structural integration, mainly in the following aspects:

[0004] 1) Low preheating efficiency of combustion air and high overall energy consumption: To recover waste heat from flue gas and increase combustion temperature, an external metal heat exchanger preheater is usually installed on the tail flue of the baking device. This tail flue is located outside the ladle. In actual operation, the temperature of the high-temperature flue gas has already dropped significantly due to heat loss along the way by the time it reaches the tail flue, resulting in low preheating efficiency of the combustion air. Furthermore, the combustion air heated by the heat exchanger preheater on the tail flue needs to be transported back to the burner burner via a long external insulated pipeline. This process involves... The heat dissipation from the pipe walls causes severe secondary heat loss. These factors combined result in a generally low overall thermal efficiency of existing ladle baking equipment, typically only around 35%. A large amount of fuel calorific value fails to effectively contribute to the heating of the ladle lining, leading to a significant waste of energy. Furthermore, due to the generally low overall thermal efficiency of existing ladle baking equipment, the amount of natural gas or coke oven gas consumed per unit ladle baking operation is large, resulting in correspondingly high emissions of pollutants such as CO2, NOx, and incompletely burned CO.

[0005] 2) Low system integration and complex auxiliary equipment: During the baking process, the junction between the baking oven cover and the edge of the ladle opening is the main area for high-temperature flue gas leakage and flame radiation overflow. In order to provide thermal protection for the edge of the ladle opening, some existing devices must rely on an independent circulating water cooling system to cool this part. This requires additional configuration of circulating water pumps, cooling towers and corresponding electrical control cabinets and other auxiliary facilities. This not only leads to low system integration and significantly increases the initial investment cost and operation and maintenance workload of the equipment, but also introduces a major safety hazard of cooling water leakage into the high-temperature lining of the ladle or the working area. Once a water leakage accident occurs, it is very easy to cause the refractory material to crack or even cause an explosion risk.

[0006] In summary, how to effectively improve the preheating efficiency of combustion air in ladle baking equipment to reduce fuel consumption, and how to optimize the system structure to eliminate reliance on water-cooled auxiliary facilities and improve integration, have become technical problems that urgently need to be solved by those skilled in the art. Utility Model Content

[0007] In view of the above-mentioned deficiencies of the prior art, the present invention provides an immersion ladle baking device that can improve the preheating efficiency of combustion air and has a high degree of system integration.

[0008] The technical solution adopted by this utility model to solve its technical problem is:

[0009] An immersion ladle baking device includes a cylinder and a burner. The cylinder includes a main body submerged inside the ladle, and a top edge extending outward from the top of the main body above the ladle opening. Both the sidewalls and the top edge of the main body are hollow. The inner cavity of the sidewalls of the main body communicates with and combines with the inner cavity of the top edge to form the inner cavity of the cylinder. A dividing plate is provided inside the inner cavity of the cylinder. One end of the dividing plate is sealed to the sidewall of the top edge, and the other end is spaced a certain distance from the bottom wall of the main body. The dividing plate divides the inner cavity of the cylinder into a first cavity near the ladle and a second cavity away from the ladle and communicating with the first cavity. An air inlet channel communicating with the first cavity is provided on the top edge of the cylinder. Multiple heat exchange tubes are provided on the cylinder. One end of each heat exchange tube communicates with the second cavity, and the other end communicates with the air inlet cavity of the burner located on the bottom wall of the main body. The gap between the top edge of the cylinder and the ladle opening edge forms a smoke exhaust channel.

[0010] Furthermore, the sidewall of the cylinder body includes a first sidewall close to the ladle and a second sidewall away from the ladle, the bottom wall of the top edge of the cylinder is integrally connected to the first sidewall, and the top wall of the top edge of the cylinder is integrally connected to the second sidewall; the top of each heat exchange tube is integrally disposed on the top wall of the top edge of the cylinder, the middle part of each heat exchange tube is integrally disposed on the second sidewall, and the bottom of each heat exchange tube is integrally disposed on the bottom wall of the cylinder body.

[0011] Furthermore, the multiple heat exchange tubes are evenly distributed around the perimeter of the cylinder.

[0012] Furthermore, multiple annular spoilers are distributed around the inner side of the second sidewall from top to bottom, with each spoiler spaced a certain distance from the dividing plate.

[0013] Furthermore, the top wall of the cylinder top edge is stepped and divided into a first top wall near the cylinder top edge side wall and a second top wall away from the cylinder top edge side wall. The first top wall is at a higher horizontal level than the second top wall. The first top wall and the second top wall are connected by an annular connecting plate, and the connecting plate is integrally connected to the dividing plate and the bottom wall of the cylinder top edge. The connecting plate divides the first cavity into a first cavity section one and a first cavity section two, and divides the second cavity into a second cavity section one and a second cavity section two. The first cavity section two and the second cavity section one... Communication is achieved through the gap between the other end of the dividing plate and the bottom wall of the cylinder body. The top of each heat exchange tube is integrally set on the second top wall, and one end of each heat exchange tube is on the connecting plate. The air inlet channel is located on the side wall of the top edge of the cylinder. The connecting plate inside the first cavity is provided with multiple first air inlets. The first cavity section one is connected to the first cavity section two through multiple first air inlets. The connecting plate inside the second cavity and below the second top wall is provided with multiple second air inlets. The second cavity section one is connected to the second cavity section two through multiple second air inlets.

[0014] Furthermore, a refractory lining is provided on the outer surface of the cylinder, and the thickness of the refractory lining is 15-30mm.

[0015] Furthermore, the bottom wall of the cylinder body is provided with a burner mounting port in the middle, and the bottom wall of the cylinder body extends upward at the mounting port to form a bottom wall extension. The bottom of each heat exchange tube is also distributed on the bottom wall extension, and the burner is integrally connected to the top of the bottom wall extension.

[0016] Furthermore, the burner includes a burner housing with an opening at the bottom end, the burner housing is integrally connected to the top end of the bottom wall extension, a burner nozzle is inserted and fixed on the top wall of the burner housing, the bottom end of the burner nozzle is flush with the bottom end of the burner housing, and the inner cavity of the burner housing forms an air inlet cavity.

[0017] Furthermore, the burner housing includes a housing body and a housing top cover. The housing body is cylindrical in shape. The housing top cover includes a bottom wall, a side wall, and a top wall. The inner edge of the bottom wall is integrally connected to the top edge of the housing body. The outer edge of the bottom wall is integrally connected to the bottom edge of the side wall. The top edge of the side wall is integrally connected to the edge of the top wall. The top wall forms the top wall of the burner housing. The top edge of the bottom wall extension is integrally connected to the bottom wall. The other end of each heat exchange tube is located on the bottom wall. The burner nozzle is installed in the middle of the top wall and is integrally connected to the top wall.

[0018] Furthermore, the burner housing is also provided with a combustion air dividing cylinder that is open at both the top and bottom. The top of the combustion air dividing cylinder is inside the top cover of the housing and the lower part is inside the housing body. The bottom of the combustion air dividing cylinder is flush with the bottom of the housing body. The combustion air dividing cylinder and the housing body are fixedly connected by multiple connecting blocks. The burner nozzle extends into the combustion air dividing cylinder.

[0019] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0020] In this invention, the submerged ladle baking device allows combustion air to enter the first chamber through the air inlet channel and flow downwards. It then enters the second chamber through the gap between the other end of the dividing plate and the bottom wall of the cylinder body, entering one end of each heat exchange tube and exiting the other end before entering the burner's air inlet chamber. There, it mixes with the fuel gas and undergoes combustion. Because the cylinder body is submerged inside the ladle, and the burner is located on the bottom wall of the cylinder body, the high-temperature flame generated during combustion is sprayed downwards and directly heats the lining on the bottom wall and the lower side wall of the ladle. The high-temperature flue gas generated after combustion exits from the cylinder... The gas flows upward through the gap between the main body and the ladle and is discharged outward through the exhaust channel. As the high-temperature flue gas flows through the gap between the main body and the ladle, it heats the lining on the upper side wall of the ladle. Furthermore, the high-temperature flue gas preheats the combustion air entering the first chamber as it is discharged outward. The combustion air continues to absorb heat from the high-temperature flue gas after entering the second chamber, and the combustion air entering each heat exchange tube continues to absorb heat from the high-temperature flue gas. Since the combustion air must flow sequentially through the first chamber, the second chamber, and each heat exchange tube before entering the burner's air inlet chamber, and the first chamber, the second chamber, and each heat exchange tube are all located in… The cylinder body is submerged inside the ladle, where the flue gas temperature is extremely high. This allows the combustion air to fully absorb the heat from the high-temperature flue gas, thus improving its preheating efficiency. Furthermore, since the combustion air enters the burner's air inlet directly after heat exchange with the high-temperature flue gas, it doesn't require long-distance transport through insulated pipes. This eliminates secondary heat loss due to heat dissipation from the pipe walls, improving the overall thermal efficiency of the unit and correspondingly reducing energy consumption. Additionally, because the air inlet channel is located on the top edge of the cylinder, above the ladle opening, combustion air at room temperature can pass through the air inlet channel... After entering the first chamber, the flue gas first exchanges heat with the high-temperature flue gas in the exhaust channel to reduce the temperature of the flue gas in the exhaust channel. The exhaust channel is formed by the gap between the top edge of the cylinder and the edge of the ladle opening, which can provide thermal protection for the edge of the ladle opening. In this way, this submerged ladle baking device does not need to rely on an independent circulating water cooling system to cool the edge of the ladle opening, and does not require additional circulating water pumps, cooling towers and corresponding electrical control cabinets and other auxiliary facilities. Therefore, this submerged ladle baking device has a high degree of system integration, which can reduce the initial investment cost of the equipment and the workload of operation and maintenance, and there is no safety risk of cooling water leakage.

[0021] Furthermore, since the overall thermal efficiency of the immersion ladle baking device of this utility model is significantly improved, the gas consumption is correspondingly reduced significantly. Compared with the traditional baking device that uses an external heat exchanger at the tail end in the background technology, the unit ladle baking operation can reduce the consumption of natural gas and other fuels by more than 20%, correspondingly reduce CO2 emissions by more than 20%, and reduce the emission concentration of pollutants such as NOx and CO. This is beneficial for steel companies to reduce energy consumption costs and environmental governance burden, and is in line with the development direction of green and low-carbon metallurgy and energy conservation and emission reduction. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the submerged steel ladle baking device of this utility model;

[0023] Figure 2 for Figure 1 A schematic diagram of the three-dimensional structure from another direction;

[0024] Figure 3 This is a three-dimensional cross-sectional view of one of the submerged ladle baking devices of this utility model;

[0025] Figure 4 for Figure 3 A structural diagram from another direction;

[0026] Figure 5 for Figure 3 A structural diagram from another direction;

[0027] Figure 6 This is another three-dimensional sectional view of the submerged ladle baking device of this utility model;

[0028] Figure 7 This is a schematic diagram of the main cross-sectional structure of the immersion-type ladle baking device of this utility model;

[0029] Figure 8 for Figure 7 A schematic diagram showing the flow direction of combustion air and flue gas.

[0030] Figure reference numerals: 1. Cylinder body; 101. Cylinder body; 10101. First side wall; 10102. Second side wall; 10103. Bottom wall extension; 102. Top edge of cylinder; 10201. First top wall; 10202. Second top wall; 2. Dividing plate; 3. Air inlet channel; 4. Heat exchange tube; 5. Smoke exhaust channel; 6. Baffle plate; 7. Connecting plate; 801. First cavity section; 80 2. First cavity, second section; 901. Second cavity, first section; 902. Second cavity, second section; 1001. First air inlet; 1002. Second air inlet; 1101. Shell body; 1102. Shell top cover; 110201. Bottom wall of top cover; 110202. Side wall of top cover; 110203. Top wall of top cover; 12. Burner; 13. Combustion air divider; 14. Connecting block; 15. Steel ladle. Detailed Implementation

[0031] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. These embodiments are only used to illustrate this utility model and are not intended to limit it.

[0032] In the description of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0034] Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0035] like Figures 1-8As shown, an immersion ladle baking device includes a cylinder 1 and a burner. The cylinder 1 includes a cylinder body 101 that is immersed in a ladle 15. A top edge 102 extends outward from the top of the cylinder body 101 and is located above the edge of the ladle opening of the ladle 15. Both the side wall of the cylinder body 101 and the top edge 102 are hollow. The inner cavity of the side wall of the cylinder body 101 communicates with the inner cavity of the top edge 102 and is combined to form the inner cavity of the cylinder body 1. A dividing plate 2 is provided in the inner cavity of the cylinder body 1. One end of the dividing plate 2 is sealed to the side wall of the top edge 102. The other end is spaced a certain distance from the bottom wall of the cylinder body 101. The dividing plate 2 divides the inner cavity of the cylinder body 1 into a first cavity close to the ladle 15 and a second cavity far from the ladle 15 and connected to the first cavity. An air inlet channel 3 connected to the first cavity is provided on the top edge 102 of the cylinder. Multiple heat exchange tubes 4 are provided on the cylinder body 1. One end of each heat exchange tube 4 is connected to the second cavity and the other end is connected to the air inlet cavity in the burner provided on the bottom wall of the cylinder body 101. The gap between the top edge 102 of the cylinder and the edge of the ladle 15 forms a smoke exhaust channel 5.

[0036] In operation, the combustion air of this submerged ladle baking device enters the first chamber through the air inlet channel 3 and flows downwards. It then enters the second chamber through the gap between the other end of the dividing plate 2 and the bottom wall of the cylinder body 101. The air then enters one end of each heat exchange tube 4 and exits from the other end, entering the air inlet chamber of the burner. There, it mixes with the fuel gas and undergoes a combustion reaction. (See...) Figure 8Because the cylinder body 101 is submerged inside the ladle 15, and the burner is located on the bottom wall of the cylinder body 101, the high-temperature flame generated during combustion is injected downwards and directly heats the lining on the bottom wall and the lower side wall of the ladle 15. The high-temperature flue gas generated after combustion flows upwards through the gap between the cylinder body 101 and the ladle 15 and is discharged outwards through the exhaust channel 5. As the high-temperature flue gas flows through the gap between the cylinder body 101 and the ladle 15, it heats the lining on the upper side wall of the ladle 15. Furthermore, as the high-temperature flue gas is discharged outwards, it preheats the combustion air entering the first chamber. The combustion air continues to absorb heat from the high-temperature flue gas after entering the second chamber, and the combustion air entering each heat exchange tube 4 also continues to absorb heat from the high-temperature flue gas. Since the combustion air needs to flow through the first chamber sequentially before entering the burner's air inlet chamber... The first chamber, the second chamber, and each heat exchange tube 4 are all located on the cylinder 1. The cylinder body 101 of the cylinder 1 is submerged in the ladle 15. The flue gas temperature inside the ladle 15 is very high, so the combustion air can fully absorb the heat of the high-temperature flue gas, thereby improving the preheating efficiency of the combustion air. In addition, since the combustion air directly enters the air inlet of the burner after exchanging heat with the high-temperature flue gas, it does not need to be transported over a long distance through the insulation pipeline. This eliminates the secondary heat loss caused by heat dissipation from the insulation pipeline wall, thus improving the overall thermal efficiency of the unit and correspondingly reducing the overall energy consumption. The overall thermal efficiency of the unit is increased from about 35% in the background technology to more than 55%, and the gas consumption is reduced by more than 20%. The flue gas temperature inside the ladle 15 reaches 800-950℃, and the temperature of the combustion air entering the air inlet after preheating reaches 300-500℃.

[0037] Furthermore, since the air inlet channel 3 is located on the top edge 102 of the cylinder, which is above the ladle opening edge of the ladle 15, the combustion air at room temperature enters the first chamber through the air inlet channel 3 and first exchanges heat with the high-temperature flue gas at the exhaust channel 5 to reduce the temperature of the flue gas at the exhaust channel 5. The exhaust channel 5 is formed by the gap between the top edge 102 of the cylinder and the ladle opening edge of the ladle 15, which can provide thermal protection for the ladle opening edge of the ladle 15. Thus, this submerged ladle baking device does not need to rely on an independent circulating water cooling system to cool the ladle opening edge of the ladle 15, and does not need to be equipped with an additional circulating water pump, cooling tower and corresponding electrical control cabinet and other auxiliary facilities. Therefore, this submerged ladle baking device has a high degree of system integration, which can reduce the initial investment cost of the equipment and the workload of operation and maintenance, and there is no safety risk of cooling water leakage.

[0038] Among them, such as Figures 3-7As shown, the sidewall of the cylinder body 101 includes a first sidewall 10101 close to the ladle 15 and a second sidewall 10102 away from the ladle 15. The bottom wall of the cylinder top edge 102 is integrally connected to the first sidewall 10101, and the top wall of the cylinder top edge 102 is integrally connected to the second sidewall 10102. The top of each heat exchange tube 4 is integrally disposed on the top wall of the cylinder top edge 102, the middle part of each heat exchange tube 4 is integrally disposed on the second sidewall 10102, and the bottom of each heat exchange tube 4 is integrally disposed on the bottom wall of the cylinder body 101.

[0039] In this way, when the submerged ladle baking device is in use, the combustion air enters the first chamber through the air inlet channel 3 and flows downward, and enters the second chamber through the gap between the other end of the dividing plate 2 and the bottom wall of the cylinder body 101 and flows upward. It enters the heat exchange tube 4 from one end and flows downward, and is discharged from the other end of the heat exchange tube 4 and enters the air inlet chamber of the burner. Therefore, the flow path of the combustion air in the cylinder body 1 can be extended sufficiently, thereby significantly improving the heat exchange efficiency between the combustion air and the high-temperature flue gas.

[0040] In one embodiment, a plurality of heat exchange tubes 4 are evenly distributed around the perimeter of the cylinder 1.

[0041] In one embodiment, such as Figures 3-7 As shown, multiple annular spoilers 6 are distributed from top to bottom around the inner side of the second sidewall 10102, with each spoiler 6 spaced a certain distance from the dividing plate 2. All spoilers 6 are arranged horizontally.

[0042] By setting up multiple baffles 6, the turbulence of the combustion air entering the second chamber can be increased, thereby further improving the heat exchange efficiency between the combustion air and the high-temperature flue gas entering the second chamber.

[0043] In one embodiment, such as Figures 3-7As shown, the top wall of the cylinder top edge 102 is stepped and divided into a first top wall 10201 near the side wall of the cylinder top edge 102 and a second top wall 10202 away from the side wall of the cylinder top edge 102. The horizontal height of the first top wall 10201 is higher than that of the second top wall 10202. The first top wall 10201 and the second top wall 10202 are connected by an annular connecting plate 7. The connecting plate 7 is integrally connected to the dividing plate 2 and the bottom wall of the cylinder top edge 102. The connecting plate 7 divides the first cavity into a first cavity first section 801 and a first cavity second section 802 and divides the second cavity into a second cavity first section 901 and a second cavity second section 902. The first cavity second section 802 and the second cavity... Section 901 of the first cavity is connected to the bottom wall of the cylinder body 101 through the gap between the other end of the dividing plate 2. The top of each heat exchange tube 4 is integrally set on the second top wall 10202, and one end of each heat exchange tube 4 is on the connecting plate 7. The air inlet channel 3 is located on the side wall of the top edge 102 of the cylinder. The connecting plate 7 in the first cavity is provided with multiple first air inlets 1001. Section 801 of the first cavity is connected to Section 802 of the first cavity through multiple first air inlets 1001. The connecting plate 7 in the second cavity and below the second top wall 10202 is provided with multiple second air inlets 1002. Section 901 of the second cavity is connected to Section 902 of the second cavity through multiple second air inlets 1002.

[0044] In this way, when the submerged ladle baking device is in use, the combustion air enters the first chamber section 801 through the air inlet channel 3, enters the first chamber section 802 through multiple first air inlets 1001 and flows downward, enters the second chamber section 902 through the gap between the other end of the dividing plate 2 and the bottom wall of the cylinder body 101 and flows upward, enters the second chamber section 901 through multiple second air inlets 1002, enters the heat exchange tube 4 through one end and flows downward, and is discharged from the other end of each heat exchange tube 4 and enters the air inlet chamber of the burner to mix with the gas and undergo a combustion reaction.

[0045] In one embodiment, a refractory lining is provided on the outer surface of the cylinder 1, and the thickness of the refractory lining is 15-30mm.

[0046] In this way, the refractory lining can protect the cylinder 1 from direct erosion by high-temperature flue gas and dust. In addition, since the refractory lining is very thin, the thermal resistance is small and it will not affect the heat exchange efficiency between the combustion air and the high-temperature flue gas inside the cylinder 1.

[0047] Each heat exchange tube 4 is also provided with a refractory lining with a thickness of 15-30mm on its outer surface. This can protect each heat exchange tube 4 from direct erosion by high-temperature flue gas and dust. Since the refractory lining is very thin, the thermal resistance is small and it will not affect the heat exchange between the combustion air and the high-temperature flue gas entering the heat exchange tube 4.

[0048] Preferably, the material of the cylinder 1 is Q345R steel plate with a wall thickness of 8-12mm, the material of the refractory lining is high-alumina refractory castable with an Al2O3 content of 65%, the thickness of the refractory lining is 20mm, and the material of each heat exchange tube 4 is 0Cr25Ni20 heat-resistant stainless steel with an outer diameter of 38mm and a wall thickness of 3mm.

[0049] In one embodiment,

[0050] The bottom wall of the cylinder body 101 has a burner mounting port in the middle. The bottom wall of the cylinder body 101 extends upward at the mounting port to form a bottom wall extension 10103. The bottoms of each heat exchange tube 4 are also distributed on the bottom wall extension 10103. Figure 6 The burner is integrally connected to the top of the bottom wall extension 10103.

[0051] By extending the bottom wall, the combustion air entering each heat exchange tube 4 first flows downward and then upward, thus further extending the flow path of the combustion air in the cylinder 1, thereby further improving the heat exchange efficiency between the combustion air and the high-temperature flue gas.

[0052] The burner includes a burner housing with an opening at the bottom. The burner housing is integrally connected to the top of the bottom wall extension 10103. A burner nozzle 12 is inserted and fixed on the top wall of the burner housing. The bottom end of the burner nozzle 12 is flush with the bottom end of the burner housing. The inner cavity of the burner housing forms an air inlet cavity.

[0053] Preferably, such as Figures 3-7As shown, the burner housing includes a housing body 1101 and a housing top cover 1102. The housing body 1101 is cylindrical. The housing top cover 1102 includes a bottom wall 110201, a side wall 110202, and a top wall 110203. The inner edge of the bottom wall 110201 is integrally connected to the top edge of the housing body 1101, and the outer edge of the bottom wall 110201 is integrally connected to the bottom edge of the side wall 110202. The top edge of the top cover side wall 110202 is integrally connected to the edge of the top cover top wall 110203, and the top cover top wall 110203 forms the top wall of the burner shell. The top edge of the bottom wall extension 10103 is integrally connected to the bottom wall 110201 of the top cover. The other end of each heat exchange tube 4 is located on the bottom wall 110201 of the top cover. The burner 12 is installed in the middle of the top cover top wall 110203 and is integrally connected to the top cover top wall 110203.

[0054] More preferably, such as Figures 3-7 As shown, the burner housing is also provided with a combustion air dividing cylinder 13 with openings at both the top and bottom. The top of the combustion air dividing cylinder 13 is inside the top cover 1102 and the bottom is inside the body 1101. The bottom of the combustion air dividing cylinder 13 is flush with the bottom of the body 1101. The combustion air dividing cylinder 13 and the body 1101 are fixedly connected by multiple connecting blocks 14. The burner nozzle 12 extends into the combustion air dividing cylinder 13.

[0055] In this way, when the submerged ladle baking device is in use, the combustion air enters the first chamber through the air inlet channel 3 and flows downward. It then enters the second chamber through the gap between the other end of the dividing plate 2 and the bottom wall of the cylinder body 101 and flows upward. It then enters the heat exchange tube 4 from one end of each heat exchange tube 4. The combustion air entering each heat exchange tube 4 first flows downward and then upward. It then exits from the other end of each heat exchange tube 4 and enters the cavity of the shell top cover 1102. It then exits through the gap between the combustion air dividing cylinder 13 and the shell body 1101 and the gap between the combustion air dividing cylinder 13 and the burner 12, respectively. It mixes with the gas discharged from the burner 12 and undergoes a combustion reaction.

[0056] Taking a typical operating condition where a single ladle baking session lasts approximately 2 hours and the final baking temperature is approximately 1050-1100℃ as an example, compared to the traditional external heat exchanger baking device in the background technology, this submerged ladle baking device can reduce natural gas consumption by approximately 20%-30% per ladle baking operation. Based on the calculation that approximately 2.0 kg of CO2 is generated per cubic meter of natural gas combustion, a single ladle baking operation can reduce CO2 emissions by approximately 15-25 kg. At the same time, due to the sufficient preheating of the combustion air and the stable combustion organization, the emission concentration of CO and unburned hydrocarbons is significantly reduced, resulting in significant comprehensive energy-saving and emission reduction benefits.

[0057] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. An immersion-type ladle baking device, characterized in that: The device includes a cylinder (1) and a burner. The cylinder (1) includes a cylinder body (101) submerged in a ladle (15). A cylinder top edge (102) extends outward from the top of the cylinder body (101) and is located above the edge of the ladle opening (15). The side walls of the cylinder body (101) and the cylinder top edge (102) are both hollow. The inner cavity of the side wall of the cylinder body (101) communicates with the inner cavity of the cylinder top edge (102) and is combined to form the inner cavity of the cylinder body (1). A dividing plate (2) is provided in the inner cavity of the cylinder body (1). One end of the dividing plate (2) is sealed to the side wall of the cylinder top edge (102) for a circumference, and the other end is sealed to the side wall of the cylinder top edge (102) for a circumference. The end is spaced a certain distance from the bottom wall of the cylinder body (101). The dividing plate (2) divides the inner cavity of the cylinder body (1) into a first cavity close to the ladle (15) and a second cavity far from the ladle (15) and connected to the first cavity. An air inlet channel (3) connected to the first cavity is provided on the top edge (102) of the cylinder. Multiple heat exchange tubes (4) are provided on the cylinder body (1). One end of each heat exchange tube (4) is connected to the second cavity and the other end is connected to the air inlet cavity in the burner set on the bottom wall of the cylinder body (101). The gap between the top edge (102) of the cylinder and the edge of the ladle (15) forms a smoke exhaust channel (5).

2. The immersion ladle baking device according to claim 1, characterized in that: The sidewall of the cylinder body (101) includes a first sidewall (10101) close to the ladle (15) and a second sidewall (10102) away from the ladle (15). The bottom wall of the top edge (102) of the cylinder is integrally connected to the first sidewall (10101), and the top wall of the top edge (102) of the cylinder is integrally connected to the second sidewall (10102). The top of each heat exchange tube (4) is integrally disposed on the top wall of the top edge (102), the middle part of each heat exchange tube (4) is integrally disposed on the second sidewall (10102), and the bottom of each heat exchange tube (4) is integrally disposed on the bottom wall of the cylinder body (101).

3. The immersion ladle baking device according to claim 2, characterized in that: Multiple heat exchange tubes (4) are evenly distributed around the perimeter of the cylinder (1).

4. The immersion ladle baking device according to claim 2, characterized in that: The inner side of the second sidewall (10102) is provided with a plurality of annular spoilers (6) distributed from top to bottom, and each spoiler (6) is spaced a certain distance from the dividing plate (2).

5. The immersion ladle baking device according to claim 2, characterized in that: The top wall of the cylinder top edge (102) is stepped and divided into a first top wall (10201) near the side wall of the cylinder top edge (102) and a second top wall (10202) away from the side wall of the cylinder top edge (102). The first top wall (10201) is at a higher horizontal level than the second top wall (10202). The first top wall (10201) and the second top wall (10202) are connected by an annular connecting plate (7). The connecting plate (7) is integrally connected to the dividing plate (2) and the bottom wall of the cylinder top edge (102). The connecting plate (7) divides the first cavity into a first cavity first section (801) and a first cavity second section (802) and divides the second cavity into a second cavity first section (901) and a second cavity second section (902). The first cavity second section (802) and the second cavity first section (901) Communication is achieved through the gap between the other end of the dividing plate (2) and the bottom wall of the cylinder body (101). The top of each heat exchange tube (4) is integrally set on the second top wall (10202), and one end of each heat exchange tube (4) is on the connecting plate (7). The air inlet channel (3) is on the side wall of the top edge (102) of the cylinder. The connecting plate (7) in the first cavity is provided with multiple first air inlets (1001). The first cavity first section (801) is connected to the first cavity second section (802) through multiple first air inlets (1001). The connecting plate (7) in the second cavity and below the second top wall (10202) is provided with multiple second air inlets (1002). The second cavity first section (901) is connected to the second cavity second section (902) through multiple second air inlets (1002).

6. The immersion ladle baking device according to claim 2, characterized in that: The outer surface of the cylinder (1) is provided with a fire-resistant lining, the thickness of which is 15-30mm.

7. The immersion ladle baking device according to claim 2, characterized in that: The bottom wall of the cylinder body (101) is provided with a burner mounting port in the middle. The bottom wall of the cylinder body (101) extends upward at the mounting port to form a bottom wall extension (10103). The bottom of each heat exchange tube (4) is also distributed on the bottom wall extension (10103). The burner is integrally connected to the top of the bottom wall extension (10103).

8. The immersion ladle baking apparatus according to claim 7, characterized in that: The burner includes a burner housing with an opening at the bottom end. The burner housing is integrally connected to the top end of the bottom wall extension (10103). A burner nozzle (12) is inserted and fixed on the top wall of the burner housing. The bottom end of the burner nozzle (12) is flush with the bottom end of the burner housing. The inner cavity of the burner housing forms an air inlet cavity.

9. The immersion ladle baking apparatus according to claim 8, characterized in that: The burner housing includes a housing body (1101) and a housing top cover (1102). The housing body (1101) is cylindrical. The housing top cover (1102) includes a bottom wall (110201), a side wall (110202), and a top wall (110203). The inner edge of the bottom wall (110201) is integrally connected to the top edge of the housing body (1101), and the outer edge of the bottom wall (110201) is integrally connected to the bottom edge of the side wall (110202). The top edge of the top cover side wall (110202) is integrally connected to the edge of the top cover top wall (110203), the top cover top wall (110203) forms the top wall of the burner shell, the top edge of the bottom wall extension (10103) is integrally connected to the bottom wall of the top cover (110201), the other end of each heat exchange tube (4) is located on the bottom wall of the top cover (110201), the burner (12) is installed in the middle of the top cover top wall (110203) and the burner (12) is integrally connected to the top cover top wall (110203).

10. The immersion ladle baking apparatus according to claim 9, characterized in that: The burner housing is also provided with a combustion air dividing cylinder (13) with openings at both the top and bottom. The top of the combustion air dividing cylinder (13) is inside the top cover (1102) and the bottom is inside the body (1101). The bottom of the combustion air dividing cylinder (13) is flush with the bottom of the body (1101). The combustion air dividing cylinder (13) and the body (1101) are fixedly connected by multiple connecting blocks (14). The burner nozzle (12) extends into the combustion air dividing cylinder (13).

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