Large-scale anode baking furnace with V-shaped flue structure

Abstract

This invention discloses a large anode roasting furnace with a V-shaped flue structure, comprising multiple furnace chambers, each chamber consisting of multiple flues and multiple material boxes arranged sequentially. The flues between adjacent furnace chambers are interconnected. Upper baffle walls and flue transverse walls are alternately arranged inside the flues. Small through holes are provided between the upper baffle walls and the top wall of the flues, and a U-shaped flow guide structure is provided between the upper baffle walls and the bottom wall of the flues. The flue transverse walls are fixed to the bottom wall of the flues, and large through holes are provided between them and the top wall of the flues. The upper baffle walls are located at the center of adjacent flue transverse walls. The upper baffle walls and flue transverse walls divide the internal space of the flues into a V-shape. This invention adds a flue transverse wall in the middle of adjacent upper baffle walls to enhance the stability of the flue structure and reduce the deformation of the flue walls caused by increased material side stress due to the increased number of material boxes after the roasting furnace is enlarged.

Description

Technical Field

[0001] This invention relates to the field of anode roasting production technology, specifically a large anode roasting furnace with a V-shaped roasting furnace fire channel structure. Background Technology

[0002] The anode roasting furnace is the core equipment for modifying green anodes into finished anodes, such as... Figure 1 As shown, a traditional anode baking furnace is divided into multiple chambers along its length. Each chamber consists of multiple material boxes, multiple fire channels, and fire channel transverse walls and material box transverse walls at both ends. The material boxes are filled with anodes and insulation materials, and natural gas is introduced into the internal cavities of the fire channels on both sides of the material boxes for combustion heating.

[0003] Most existing anode baking furnaces are small anode baking furnaces, with each furnace chamber typically consisting of 8 feed boxes. A few large anode baking furnaces have increased the length and width of each feed box and increased the number of feed boxes in each furnace chamber, from the initial 8 feed boxes and 9 fire channels in a single furnace chamber to the current largest 17 feed boxes and 18 fire channels.

[0004] The large-scale anode roasting furnace effectively reduces the impact of heat dissipation from the side flues and increases the output of a single furnace. However, in actual production, it has been found that the wall deformation of large anode roasting furnaces is particularly severe, mainly manifested as bending deformation of the flues and cracking of the corners of the feed box. If daily maintenance is not in place, the flues can become severely deformed after about one year of operation, accompanied by cracking of the corners of the feed box, and the service life will be shortened to 3-5 years.

[0005] Patent CN201110373049.8 provides a method for arranging bricks in the fire channel of an open-type calcining furnace and for arranging fire holes, such as... Figure 2 The diagram shows a cross-sectional view of a W-shaped flue structure along the length of an existing anode roasting furnace. Each furnace chamber includes multiple feed hoppers, with transverse walls at both ends of each hopper, serving as partitions between different furnace chambers. Flues run along both sides of the feed hoppers, with transverse walls at both ends. Upper and lower baffle walls within the flues divide the flue space of a single furnace chamber into W-shaped flues. These baffles, combined with randomly placed guide bricks, can turbulent the flue gas to enhance heat exchange, but their effect on fixing the wall structure is limited. Therefore, the structural stability of the flue wall at its center is the worst, and its deformation is typically a central bending deformation. During the anode roasting furnace production process, the material exerts significant lateral pressure on the flue wall due to its own weight. Combined with the high-temperature expansion of the flue wall itself, the flue wall will bend and deform in the direction of the lateral pressure (e.g., ...). Figure 3Large anode roasting furnaces suffer from several challenges. Firstly, the increased number of feed hoppers leads to increased lateral pressure on the material. Secondly, the increased length of the flue reduces the stability of the flue wall structure due to the reduced support from the guide bricks, upper and lower baffle walls, feed hopper end walls, and flue end walls. When these factors combine, and improper production and maintenance occur, the flue wall of the anode roasting furnace can experience severe deformation and corner cracking within a short period, significantly shortening the furnace's lifespan. Therefore, addressing the severe deformation of the flue wall in large anode roasting furnaces is a crucial technical challenge for achieving large-scale roasting furnace development. Summary of the Invention

[0006] In view of the above-mentioned shortcomings and deficiencies, the present invention provides a large anode roasting furnace with a V-shaped roasting furnace fire channel structure, which solves the problem of deformation of the fire channel wall caused by the increased material side stress due to the increase in the number of material boxes after the roasting furnace is enlarged, and strengthens the stability of the fire channel structure.

[0007] To achieve the above objectives, the main technical solutions adopted by the present invention include: A large anode roasting furnace with a V-shaped fire channel structure includes multiple furnace chambers, each chamber consisting of multiple fire channels and multiple material boxes arranged sequentially, with the fire channels between adjacent furnace chambers interconnected. The fire channels are characterized by: alternating upper baffle walls and fire channel transverse walls inside the fire channels; small through holes are provided between the upper baffle walls and the top wall of the fire channel, and a U-shaped flow guiding structure is provided between the upper baffle walls and the bottom wall of the fire channel; the fire channel transverse walls are fixed to the bottom wall of the fire channel, and large through holes are provided between them and the top wall of the fire channel; the upper baffle walls are located at the exact center of the adjacent fire channel transverse walls, and the upper baffle walls and fire channel transverse walls divide the internal space of the fire channels into a V-shape.

[0008] The side of the fire channel transverse wall that contacts the material box is provided with a fire channel transverse wall groove, and a fixing groove is provided on the top wall of the fire channel corresponding to the position of the fire channel transverse wall groove. The fixing grooves of all fire channels in the same furnace chamber are on the same straight line.

[0009] It also includes a castable plate. The fixed grooves of the two adjacent fire channels in each furnace chamber are the insertion positions of the castable plate. The castable plate is inserted into the fixed groove at the top wall of the fire channel and then abuts against the bottom wall of the fire channel after being inserted into the groove of the horizontal wall of the fire channel.

[0010] The castable plate has an internal steel frame and is formed by casting heavy refractory castable.

[0011] The distance between adjacent fire channel transverse walls is less than 2500 mm to ensure the stability of the internal structure of the fire channel.

[0012] The present invention has the following beneficial effects and advantages: 1. The lower baffle wall of the existing roasting furnace was eliminated, and a fire channel transverse wall was added in the middle of the adjacent upper baffle wall. This solved the problem of deformation of the fire channel wall caused by the increased material side stress due to the increase in the number of material boxes after the roasting furnace was enlarged. It strengthened the stability of the fire channel structure and could also further increase the length of a single material box. 2. The use of removable and replaceable castable refractory plates to replace the original transverse walls of the material box can determine the number and position of the castable refractory plates to be inserted according to production needs, thereby reducing the amount of refractory materials used, reducing construction costs, reducing the heat storage of the furnace body, and reducing product energy consumption. Attached Figure Description

[0013] Figure 1 This is a partial top view of an existing anode baking furnace along its length. Figure 2 This is a cross-sectional view of the W-shaped flue structure along the length of an existing anode baking furnace; Figure 3 This is a schematic diagram of the existing anode baking furnace after the fire channel is deformed along its length. Figure 4 This is a cross-sectional view of the V-shaped fire channel structure along the length of the anode baking furnace of the present invention; Figure 5 This is a partial top view of the anode baking furnace of the present invention along its length. Figure 6 for Figure 5 Enlarged view of a specific area.

[0014] Among them, 1. Fire passage hole; 2. Guide brick; 3. Irregularly shaped guide brick; 4. Upper baffle wall; 5. Top wall of fire channel; 6. Lower baffle wall; 7. Horizontal wall of fire channel; 8. Bottom wall of fire channel; 9. Fire channel; 10. Material box; 11. Fire hole; 12. Horizontal wall of material box; 13. Corner of material box; 14. Fixing groove; 15. Castable refractory plate; 16. Insertion position of castable refractory plate. Detailed Implementation

[0015] The invention will be further described below with reference to the accompanying drawings. Existing anode baking furnaces include multiple furnace chambers, each chamber consisting of multiple fire channels 9 and multiple material boxes 10 arranged sequentially. The fire channels 9 between adjacent furnace chambers are interconnected, and the interior of the fire channels has a W-shaped structure. For example... Figures 4-6 The invention relates to a large anode roasting furnace with a V-shaped fire channel structure. Inside the fire channel 9, upper baffle walls 4 and fire channel transverse walls 7 are alternately arranged. Small holes for fire passage are left between the upper baffle walls 4 and the top wall 5 of the fire channel, and a U-shaped flow guiding structure is set between the upper baffle walls 4 and the bottom wall 8 of the fire channel. The fire channel transverse walls 7 are fixed on the bottom wall 8 of the fire channel, and large holes for fire passage are left between the upper baffle walls 4 and the top wall 5 of the fire channel. The upper baffle walls 4 are located at the center of the adjacent fire channel transverse walls 7. The upper baffle walls 4 and the fire channel transverse walls 7 divide the internal space of the fire channel into a V-shape.

[0016] The distance between adjacent fire channel transverse walls is less than 2500 mm to ensure the stability of the internal structure of the fire channel.

[0017] The fire channel transverse wall 7 is provided with a fire channel transverse wall groove on the side that contacts the material box 10. A fixing groove 14 is provided at the top wall 5 of the fire channel corresponding to the fire channel transverse wall groove. The fixing grooves 14 of all fire channels 9 in the same furnace chamber are on the same straight line and cannot be misaligned.

[0018] It also includes casting plates. The fixed grooves 14 between two adjacent fire channels 9 in each furnace chamber are the casting plate insertion positions 16. There can be more than one casting plate insertion position 16 between adjacent casting plates 15, depending on the production needs.

[0019] In this embodiment, adjacent casting plates 15 are spaced apart by a casting plate insertion position 16. The casting plate 15 is inserted into the fixing groove 14 at the top wall 5 of the fire channel, and after being inserted into the groove of the fire channel transverse wall, it abuts against the bottom wall 8 of the fire channel. The inserted casting plate 15 divides the material box 10 into two areas. Since the fixing grooves 14 of all fire channels 9 in the same furnace chamber are on the same straight line, all casting plates 15 are inserted at the corresponding positions in the material box 10 and are also on the same straight line, ensuring that the furnace chambers composed of corresponding material boxes 10 are on the same temperature curve.

[0020] The castable plate 15 preferably has a steel structure frame inside, which is cast from heavy refractory castable to replace the original material box transverse wall 12 of the anode baking furnace. It can be inserted and pulled out in the fixed groove 14.

[0021] like Figure 1-2As shown, a single chamber of an existing anode roasting furnace includes multiple feed boxes 10. Fire channels 9 are located on both sides of each feed box 10, and transverse walls 12 are located at both ends. The transverse walls 12 serve as partitions between different chambers. A transverse wall 7 is installed at the corresponding position of the feed box transverse wall 12 in each fire channel 9. The transverse walls 7 are located at both ends of the fire channel 9 corresponding to a single chamber. The interior of the fire channel 9 consists of an upper baffle wall 4, a lower baffle wall 6, guide bricks 2, and shaped guide bricks 3. The transverse walls 7, along with the upper and lower baffle walls 4 and 6, divide the internal space of the fire channel 9 into a W-shape, effectively extending the flow path of the high-temperature flue gas. The transverse walls 7 provide strong fixation for the wall structures at both ends of the fire channel 9. The upper baffle wall 4, lower baffle wall 6, guide bricks 2, and shaped guide bricks 3 inside the fire channel 9 mainly serve to turbulent the flue gas flow, and their effect on fixing the internal wall structure of the fire channel 9 is extremely limited. Therefore, the closer to... The more central the fire channel 9, the worse the stability of its wall structure. The material box 10 contains anodes and bulk filler. The weight of the material itself will generate outward lateral pressure on the fire channel walls on both sides. Since the anode roasting furnace is a periodic heating device, when it is in the heating and heating stage, the walls of fire channel 9 will expand due to heat. Under the action of the outward lateral pressure of the material, the expanded length of the walls of fire channel 9 will bend outward. When the anode roasting furnace is in the cooling and cooling stage, the bending deformation of the walls of fire channel 9 can only be partially due to cooling contraction, and a considerable part of it will remain deformed. This will happen every time the furnace is heated and cooled during production. Therefore, as the number of cycles of the anode roasting furnace increases, the deformation of the walls of its fire channel 9 will become more and more obvious. Traditional small anode roasting furnaces usually do not show significant deformation until about 7-10 years later, requiring major overhaul. Existing large-scale anode baking furnaces mainly increase the length of the furnace chamber and the number of material bins 10. When the number of material bins 10 in a single furnace chamber increases, the lateral pressure of the material on the fire channel 9 wall increases. The increase in furnace chamber length leads to a decrease in the central structural stability of the fire channel 9 wall. If production and maintenance are not handled properly, under the combined effect of the above multiple factors, the fire channel 9 wall will undergo severe deformation (e.g., Figure 3 As shown in the figure, this severe deformation will also put great pressure on the wall of the corner 13 of the material box, causing large cracks in the wall of the corner 13 of the material box during production. The above phenomenon also shortens the service life of the current large anode baking furnace to about 3-5 years before it needs to be overhauled.

[0022] This invention relates to a V-shaped fire channel structure and a large anode roasting furnace. The lower baffle wall 6 is eliminated, and a fire channel transverse wall 7 is added at the center of the adjacent upper baffle wall 4. The fire channel transverse wall 7 and the upper baffle wall 6 divide the internal space of the fire channel 9 into a V-shape. Because the stability of the new fire channel 9 wall is significantly improved, this invention eliminates the need for the existing refractory box transverse wall 12 of the anode roasting furnace, replacing it with a castable refractory plate 15 that can be flexibly inserted and removed. This reduces the amount of refractory material used in the anode roasting furnace and also reduces heat loss from the walls, thus lowering overall production costs. Furthermore, the position of the castable refractory plate 15 is flexibly adjustable, improving production flexibility.

Claims

1. A large anode calcining furnace with a V-shaped calcining furnace flue structure, comprising multiple furnace chambers, each furnace chamber consisting of multiple flues and multiple material boxes arranged sequentially, with the flues between adjacent furnace chambers interconnected, characterized in that: The fire channel is alternately equipped with an upper baffle wall and a fire channel transverse wall. A small fire passage hole is left between the upper baffle wall and the top wall of the fire channel, and a U-shaped flow guiding structure is set between the upper baffle wall and the bottom wall of the fire channel. The fire channel transverse wall is fixed to the bottom wall of the fire channel, and a large fire passage hole is left between it and the top wall of the fire channel. The upper baffle wall is located at the center of the adjacent fire channel transverse wall, and the upper baffle wall and the fire channel transverse wall divide the internal space of the fire channel into a V-shape. The side of the fire channel transverse wall that contacts the material box has a fire channel transverse wall groove, and the top wall of the fire channel corresponding to the fire channel transverse wall groove has a fixed groove. The fixed grooves of all fire channels in the same furnace chamber are on the same straight line. It also includes a castable plate. The fixed grooves of the two adjacent fire channels in each furnace chamber are the insertion positions of the castable plate. The castable plate is inserted into the fixed groove at the top wall of the fire channel and then abuts against the bottom wall of the fire channel after being inserted into the groove of the horizontal wall of the fire channel.

2. The large anode calcining furnace with a V-shaped calcining furnace flue structure according to claim 1 is characterized in that: The castable plate has an internal steel frame and is formed by casting heavy refractory castable.

3. The large anode calcining furnace with a V-shaped calcining furnace flue structure according to claim 1 is characterized in that: The distance between adjacent fire channel transverse walls is less than 2500 mm to ensure the stability of the internal structure of the fire channel.

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