A double-chamber kiln fire extraction hole structure and assembly method

Abstract

The embodiment of the present invention provides a double-chamber kiln fire extraction hole structure and an assembly method, which relate to the field of fire extraction hole structures. The double-chamber kiln fire extraction hole structure includes a mounting seat, a silicon carbide inner cylinder and a plurality of refractory bricks, the silicon carbide inner cylinder is connected to the mounting seat, the plurality of refractory bricks are arranged in a matrix outside the silicon carbide inner cylinder, and the plurality of refractory bricks together form an outer cylinder, a cavity is provided between the outer cylinder and the silicon carbide inner cylinder, and the cavity is used to set a castable. When the double-chamber kiln fire extraction hole structure is in use, the silicon carbide inner cylinder is connected to the mounting seat, and the cavity between the outer cylinder and the silicon carbide inner cylinder is sealed by a castable. Compared with the inner cylinder in the prior art, the silicon carbide inner cylinder has a stronger structural strength and better heat resistance, which improves the structural strength and heat resistance of the inner cylinder of the fire extraction hole, alleviates the phenomenon of thermal damage to the inner cylinder of the fire extraction hole, avoids the escape or leakage of hot gas, and ensures the safety of the double-chamber kiln during production and operation.

Description

Technical Field

[0001] The invention relates to the field of fire extraction hole structures, and in particular to a fire extraction hole structure of a double-chamber kiln and an assembly method thereof. Background Art

[0002] The double-chamber kiln is one of the mainstream thermal equipment for lime calcining today. It can use liquid, gas, powdered solid and other fluids as fuel to produce high-quality, low-consumption active lime. Because its heat energy consumption is the lowest among all lime kilns, it is widely used in the metallurgical lime industry. The double-chamber kiln is a vertical kiln consisting of two kiln tubes connected at a low and medium position. At the bottom of the calcining zone of the two kiln chambers, there are an annular channel surrounding the kiln chamber and a direct channel connecting the two kiln chambers. During the production process, the flue gas in the kiln enters the annular channel of the other kiln chamber from the annular channel of one kiln chamber. Fire-poking holes are evenly arranged at the top of the annular channel and the direct channel of the bull leg type double-chamber kiln, with 18 holes in each kiln chamber and 36 holes in total for the two chambers. The function of the fire-poking hole is to check the condition of the kiln flue gas annular channel, and it is also the cleaning port for regular cleaning of the channel.

[0003] Due to the high temperature around the fire-pulling hole, the fire-pulling hole in the prior art is prone to thermal damage to the inner tube, resulting in hot gas escape or leakage, and ultimately causing the temperature of the platform steel plate at the fire-pulling hole to be too high, forcing the kiln to be shut down for major repairs. Summary of the invention

[0004] The present invention provides a double-chamber kiln fire extraction hole structure and an assembly method, which can alleviate the phenomenon of thermal damage to the inner cylinder of the fire extraction hole, avoid the escape or leakage of hot gas, and ensure the safety of the double-chamber kiln during production and operation.

[0005] The embodiments of the present invention can be implemented as follows:

[0006] An embodiment of the present invention provides a double-chamber kiln fire extraction hole structure, which includes:

[0007] Mounting seat;

[0008] A silicon carbide inner cylinder, the silicon carbide inner cylinder is connected to the mounting seat;

[0009] A plurality of refractory bricks are arranged in a matrix outside the silicon carbide inner cylinder, and the plurality of refractory bricks together form an outer cylinder, a cavity is provided between the outer cylinder and the silicon carbide inner cylinder, and the cavity is used for arranging castables.

[0010] Optionally, the silicon carbide inner cylinder includes a cylinder body and a cylinder shoulder, wherein the cylinder shoulder is arranged along the circumferential direction of the cylinder body and connected to the outer wall of the cylinder body, and the cylinder shoulder is used to support the cylinder body in the castable.

[0011] Optionally, the tube shoulder is in the shape of a skirt wing.

[0012] Optionally, the thickness of the cylinder ranges from 20 mm to 22 mm.

[0013] Optionally, the silicon carbide inner cylinder also includes a cylinder foot and a cylinder head, and the cylinder foot and the cylinder head are both arranged along the circumferential direction of the cylinder body, the cylinder foot is connected to the bottom edge of the cylinder body, the cylinder head is connected to the top edge of the cylinder body, the cylinder head is abutted against the mounting seat, and the cylinder foot is used to seal with the bottom of the castable.

[0014] Optionally, the width of the cylinder foot along the radial direction of the cylinder body ranges from 25 mm to 35 mm.

[0015] Optionally, the thickness of the barrel foot ranges from 30 mm to 32 mm.

[0016] Optionally, the thickness of the barrel head ranges from 20 mm to 25 mm.

[0017] Optionally, the cavity is V-shaped.

[0018] An embodiment of the present invention further provides an assembly method of a double-chamber kiln fire extraction hole structure, which is used to assemble the double-chamber kiln fire extraction hole structure. The assembly method comprises:

[0019] Assemble the silicon carbide inner cylinder on the mounting seat and seal the gap between the cylinder shoulder and the mounting seat;

[0020] A plurality of refractory bricks are stacked around the silicon carbide inner cylinder to form an outer cylinder, and a gap between the outer cylinder and the inner cylinder is formed into a V shape;

[0021] Pour the castable into the cavity to seal it.

[0022] The beneficial effects of the double-chamber kiln fire extraction hole structure and assembly method of the embodiment of the present invention include, for example:

[0023] The double-chamber kiln fire-pulling hole structure includes a mounting seat, a silicon carbide inner cylinder and a plurality of refractory bricks, the silicon carbide inner cylinder is connected to the mounting seat, a plurality of refractory bricks are arranged in a matrix outside the silicon carbide inner cylinder, and the plurality of refractory bricks together form an outer cylinder, a cavity is provided between the outer cylinder and the silicon carbide inner cylinder, and the cavity is used to set a castable. When the double-chamber kiln fire-pulling hole structure is in use, the silicon carbide inner cylinder is connected to the mounting seat, and the cavity between the outer cylinder and the silicon carbide inner cylinder is sealed by a castable. Compared with the inner cylinder in the prior art, the silicon carbide inner cylinder has a stronger structural strength and better heat resistance, which improves the structural strength and heat resistance of the inner cylinder of the fire-pulling hole, alleviates the phenomenon of thermal damage to the inner cylinder of the fire-pulling hole, avoids the escape or leakage of hot gas, and ensures the safety of the double-chamber kiln during production and operation.

[0024] The assembly method of the double-chamber kiln fire extraction hole structure includes assembling the silicon carbide inner cylinder on the mounting seat, sealing the gap between the cylinder shoulder and the mounting seat; stacking a plurality of refractory bricks around the silicon carbide inner cylinder to form an outer cylinder, and making the gap between the outer cylinder and the inner cylinder V-shaped; pouring the castable into the cavity for sealing. The assembly method is simple to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 A schematic diagram of a double-chamber kiln fire extraction hole structure provided in this embodiment;

[0027] Figure 2 A schematic diagram of the structure of the silicon carbide inner cylinder provided in this embodiment;

[0028] Figure 3 A schematic diagram of the structure of the refractory bricks provided in this embodiment.

[0029] Icons: 10-mounting seat; 20-silicon carbide inner cylinder; 21-cylinder body; 22-cylinder shoulder; 23-cylinder foot; 24-cylinder head; 30-refractory brick; 40-cavity; 100-double-chamber kiln fire extraction hole structure. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0033] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear to indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0034] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0035] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0036] The double-chamber kiln is one of the mainstream thermal equipment for lime calcining today. It can use liquid, gas, powdered solid and other fluids as fuel to produce high-quality, low-consumption active lime. Because its heat energy consumption is the lowest among all lime kilns, it is widely used in the metallurgical lime industry. The double-chamber kiln is a vertical kiln consisting of two kiln tubes connected at a low and medium position. At the bottom of the calcining zone of the two kiln chambers, there are an annular channel surrounding the kiln chamber and a direct channel connecting the two kiln chambers. During the production process, the flue gas in the kiln enters the annular channel of the other kiln chamber from the annular channel of one kiln chamber. Fire-poking holes are evenly arranged at the top of the annular channel and the direct channel of the bull leg type double-chamber kiln, with 18 holes in each kiln chamber and 36 holes in total for the two chambers. The function of the fire-poking hole is to check the condition of the kiln flue gas annular channel, and it is also the cleaning port for regular cleaning of the channel.

[0037] Due to the high temperature around the fire-pulling hole, the fire-pulling hole in the prior art is prone to thermal damage to the inner tube, resulting in hot gas escape or leakage, and ultimately causing the temperature of the platform steel plate at the fire-pulling hole to be too high, forcing the kiln to be shut down for major repairs.

[0038] Please refer to Figure 1-Figure 3 The present embodiment provides a double-chamber kiln fire extraction hole structure 100, which can effectively improve the above-mentioned technical problems, alleviate the phenomenon of thermal damage to the inner cylinder of the fire extraction hole, avoid hot gas escape or leakage, and ensure the safety of the double-chamber kiln during production and operation.

[0039] Please refer to Figure 1 and Figure 2 The present embodiment provides a double-chamber kiln fire-pulling hole structure 100 including a mounting seat 10, a silicon carbide inner cylinder 20 and a plurality of refractory bricks 30. The silicon carbide inner cylinder 20 is connected to the mounting seat 10. The plurality of refractory bricks 30 are arranged in a matrix outside the silicon carbide inner cylinder 20, and the plurality of refractory bricks 30 together form an outer cylinder. A cavity 40 is provided between the outer cylinder and the silicon carbide inner cylinder 20, and the cavity 40 is used to set a castable.

[0040] Specifically, the poker hole in the prior art uses heat-resistant steel in technical design, which solves the problem of rigidity and hardness. During production and operation, the heat-resistant steel inner tube expands due to heat at high temperature. However, since the expansion coefficient of heat-resistant steel is much larger than the expansion coefficient of surrounding castable refractory materials, the inner tube thermally stresses the surrounding refractory materials outward, causing extrusion and cracking damage. When cleaning the channel or inspecting the poker hole, the kiln must be stopped to open the poker hole cover. To ensure the safety of cleaning and inspection operations, the induced draft fan must be turned on to form negative pressure, and cold air must be drawn into the poker hole, which will cause the poker hole to cool suddenly and form cold contraction. Similarly, since the shrinkage coefficient of the heat-resistant steel inner tube is much larger than the surrounding sintered refractory materials, shrinkage gaps will be generated. After repeated "hot-cold-hot" alternations for a long time, the inner tube of the poker hole will cause irreversible thermal stress extrusion and cracking damage to the surrounding castable refractory materials, causing the sintered refractory materials to fall off and quickly form cavity gaps. Hot flue gas rises. In order to solve this technical problem, the double-chamber kiln fire-pulling hole structure 100 provided in this embodiment adopts a silicon carbide inner cylinder 20. Compared with the inner cylinder in the prior art, the silicon carbide inner cylinder 20 has a stronger structural strength and better heat resistance, thereby improving the structural strength and heat resistance of the inner cylinder of the fire-pulling hole, alleviating the phenomenon of thermal damage to the inner cylinder of the fire-pulling hole, avoiding the escape or leakage of hot gas, and ensuring the safety of the double-chamber kiln during production and operation.

[0041] Specifically, the performance index requirements of the silicon carbide inner cylinder 20 are shown in the following table:

[0042] Table 1

[0043] Project Category Parameters <![CDATA[* Bulk density g / cm 3 > ≥3.0 *Air gap rate ≤0.1 *Mohs hardness ≥9.3 * Vickers microhardness <![CDATA[≥2000KG / mm 2 ]]> tensile strength 450Mpa(20℃)400Mpa(1200℃) Bending strength 250Mpa(20℃)280Mpa(1200℃) Elastic modulus 330Gpa(20℃)300Gpa(1200℃) Thermal conductivity ≤9.0W / mk *Operating temperature ≥1600℃ *Linear expansion coefficient ≤5×10-6(m / ℃)

[0044] Specifically, the silicon carbide inner cylinder 20 includes a cylinder body 21 and a cylinder shoulder 22 . The cylinder shoulder 22 is arranged along the circumferential direction of the cylinder body 21 and connected to the outer wall of the cylinder body 21 . The cylinder shoulder 22 is used to support the cylinder body 21 in the castable.

[0045] The barrel 21 is cylindrical, the distance between the barrel shoulder 22 and the top edge of the barrel 21 is 200 mm, and the length of the barrel shoulder 22 is in the range of 20 mm to 25 mm.

[0046] In this embodiment, the length of the barrel shoulder 22 is 20 mm. In other embodiments, the length of the barrel shoulder 22 may be 21 mm or 24 mm, which is not specifically limited here.

[0047] In this embodiment, the position of the barrel shoulder 22 corresponds to the position of the casting layer, so that the barrel shoulder 22 can support the barrel body 21 on the casting layer, prevent the barrel body 21 from sliding at high temperature, and ensure that the barrel body 21 can remain relatively still with the casting layer under high temperature expansion. At the same time, it is prevented that the barrel body 21 causes irreversible damage to the surrounding casting material, causing the casting material to fall off.

[0048] In this embodiment, the tube shoulder 22 is in the shape of a skirt wing.

[0049] After a cavity is formed around the inner tube of the poker hole in the prior art, hot flue gas will rise. In terms of design, the thickness of the castable around the poker hole is 20-40mm. The original brickwork design around the inner tube of the poker hole is composed of 4 types of special-shaped bricks, which are combined and built to form a straight-cylinder-shaped cavity. The cavity is filled and compacted by pouring castables. However, due to the small cavity and the small on-site working space, the plugging material is not compacted. Furthermore, if the straight-cylinder-shaped cavity is filled with ramming material, once it bursts, erodes and erodes during future production operations, it is very easy to cause the filling body to fall off continuously in a "domino-like" manner. After multiple process shutdowns for kiln channel cleaning and inspection, a cavity is quickly formed around the inner tube after the burnt material falls off. Hot flue gas at nearly 1000°C reaches the lightweight castable and refractory wool insulation layer under high pressure, forming a high-temperature, high-pressure thermal scouring, causing the lightweight castable and refractory wool of the insulation layer to burn at high temperature. The hot air flow moves up and down at the poker hole, forming heat radiation and heat conduction, resulting in excessive temperature of the platform around the poker hole, as high as nearly 300°C or directly burning red. This brings safety hazards such as deformation and thermal cracking to the platform steel structure. At the same time, the energy consumption cost of kiln construction due to heat loss increases. Compared with the heat-resistant steel inner cylinder in the prior art, the silicon carbide inner cylinder 20 used in this embodiment has a cylinder body 21 with a thickness ranging from 20 mm to 22 mm. Compared with the cylinder body 21 in the prior art, the thickness of the cylinder body 21 in this embodiment is increased, and the weight of the silicon carbide inner cylinder 20 is lighter. At the same time, the strength of the silicon carbide inner cylinder 20 is effectively improved, and the resistance to high-temperature airflow erosion and wear resistance of the silicon carbide inner cylinder 20 are improved.

[0050] In this embodiment, the thickness of the cylinder 21 is 20 mm. In other embodiments, the thickness of the cylinder 21 may be 21 mm or 22 mm, which is not specifically limited here.

[0051] It should also be explained that the silicon carbide inner cylinder 20 also includes a cylinder foot 23 and a cylinder head 24, and the cylinder foot 23 and the cylinder head 24 are both arranged along the circumferential direction of the cylinder body 21, the cylinder foot 23 is connected to the bottom edge of the cylinder body 21, the cylinder head 24 is connected to the top edge of the cylinder body 21, the cylinder head 24 is abutted against the mounting seat 10, and the cylinder foot 23 is used to seal with the bottom of the castable.

[0052] In this embodiment, the barrel foot 23 and the barrel head 24 are both in annular shape.

[0053] Specifically, the width of the barrel foot 23 along the radial direction of the barrel body 21 ranges from 25 mm to 35 mm. In this embodiment, the width of the barrel foot 23 along the radial direction of the barrel body 21 is 25 mm. In other embodiments, the width of the barrel foot 23 along the radial direction of the barrel body 21 may be 28 mm, 30 mm, or 34 mm, which is not specifically limited here.

[0054] Specifically, the thickness of the barrel foot 23 ranges from 30 mm to 32 mm. In the present embodiment, the thickness of the barrel foot 23 is 30 mm. In other embodiments, the width of the barrel foot 23 along the radial direction of the barrel body 21 can be 31 mm or 32 mm, which is not specifically limited here.

[0055] It should be noted that the lower part of the inner tube sleeve of the fire-pulling hole in the prior art is easily damaged and deformed by heat, and then thinned and damaged by high-temperature hot smoke and dust, so the bottom of the inner tube of the fire-pulling hole is prone to thermal runaway. The double-chamber kiln fire-pulling hole structure 100 provided in this embodiment has a tube foot 23 connected to the bottom edge of the cylinder 21, so when pouring the castable into the cavity 40, there is no need to pre-support the bottom for support. The tube foot 23 and the castable can be sealed, and the tube foot 23 can achieve a supporting function to prevent the castable from continuously falling off after accidental damage, thereby causing the cavity 40 to deteriorate.

[0056] Specifically, the thickness of the barrel head 24 ranges from 20 mm to 25 mm. In the present embodiment, the thickness of the barrel head 24 is 25 mm. In other embodiments, the thickness of the barrel head 24 can be 24 or 21 mm, which is not specifically limited here.

[0057] In this embodiment, in order to facilitate casting of the cavity 40 so that the casting material can be easily poured into the cavity 40 and flow along the cavity 40 by itself, the cavity 40 is V-shaped.

[0058] Please refer to Figure 3 It should be noted that when cutting the refractory bricks 30, the cutting is performed along the upper edge of the refractory bricks at a cutting angle A of 77-82 degrees. The cutting point is selected based on the condition that the upper end of the refractory bricks 30 are 60-90 mm away from the inner tube and the lower end is 20-30 mm away from the inner tube after the refractory bricks 30 are surrounded. After multiple refractory bricks 30 are surrounded, an overall V-shaped structure is formed at the upper and lower parts of the silicon carbide inner tube 20.

[0059] In addition, the castable used in this embodiment is a steel fiber reinforced corundum castable with good self-flowability and high strength. The castable can be vibrated to ensure compactness. It uses bauxite clinker as aggregate, bauxite clinker and corundum fine powder as matrix, various composite materials such as ultrafine powder as binder and additive, and stainless steel heat-resistant fiber as a preparation. In addition to conventional high-temperature wear resistance, due to the addition of a certain amount of heat-resistant stainless steel fiber in its ingredients, it can also prevent the expansion difference between the aggregate and the matrix in the material under high temperature, and avoid the stress caused by the temperature gradient change when the furnace is started and stopped, which leads to the destruction of the castable body, effectively improving the thermal shock performance. At the same time, due to the addition of steel fiber, the overall strength of the material after casting is greatly enhanced, which can significantly enhance the overall toughness and strength of the castable, and better solve the high-temperature bursting and peeling damage of the castable.

[0060] Specifically, the performance index requirements of the castable are shown in the following table:

[0061] Table 2

[0062]

[0063] The embodiment of the present invention further provides an assembly method of a double-chamber kiln fire extraction hole structure 100, which is used to assemble the above-mentioned double-chamber kiln fire extraction hole structure 100. The assembly method comprises:

[0064] S1: Assemble the silicon carbide inner cylinder 20 on the mounting seat 10 and seal the gap between the cylinder shoulder 22 and the mounting seat 10;

[0065] Specifically, the silicon carbide inner cylinder 20 is assembled on the mounting seat 10, and the gap between the cylinder shoulder 22 and the mounting seat 10 is sealed with silicon carbide refractory mud for one week to improve the sealing performance;

[0066] S2: Wrap the silicon carbide inner cylinder 20 with ceramic fiber felt to protect the expansion gap of the castable in the next step. Specifically, the ceramic fiber felt is required to be 10mm thick and 500-600mm high. It is further required to be resistant to high temperatures of 1200°C and 250-300mm higher than the height of the refractory brick 30.

[0067] The application of ceramic fiber felt wrapping can effectively eliminate the different expansion stresses between the silicon carbide inner cylinder 20 and the castable due to high temperature, and keep the two tightly combined;

[0068] S3: stacking a plurality of refractory bricks 30 around the silicon carbide inner cylinder 20 to form an outer cylinder, and making the gap between the outer cylinder and the inner cylinder V-shaped;

[0069] Specifically, multiple refractory bricks 30 are stacked around the silicon carbide inner cylinder 20 to form an outer cylinder, and the cavity 40 between the outer cylinder and the inner cylinder is in a V-shaped funnel shape to facilitate the pouring construction and the self-flowing filling of the pouring material. It is further required that the upper end of the cavity 40 is 60-90 mm away from the inner cylinder, and the lower end of the cavity 40 is 20-30 mm away from the inner cylinder;

[0070] S4: Check the gap between the tube foot 23 and the refractory brick 30, and use refractory cotton to block it to prevent local material leakage during pouring;

[0071] S5: pouring the casting material into the cavity 40 for sealing;

[0072] Specifically, the stirred steel fiber reinforced casting material is poured into the "V"-shaped funnel cylindrical cavity 40 at one time, and vibrated evenly with a vibrating rod to ensure the strength of the casting body;

[0073] S6: After pouring, naturally dry for 24 hours, pour lightweight clay castable on the top of the refractory bricks 30 and around the silicon carbide inner tube 20, with a thickness of 200-300mm, and rake it flat to improve the sealing and heat insulation effect;

[0074] S7: Finally, the gap between the lightweight clay castable and the poker hole platform is filled with refractory wool. It is required to use a wooden stick to fill and compact the refractory wool around the silicon carbide inner tube 20 to improve the sealing and heat insulation effect.

[0075] The double-chamber kiln fire extraction hole structure 100 and assembly method provided in this embodiment have at least the following advantages:

[0076] The double-chamber kiln fire-pulling hole structure 100 technically eliminates the problems of high-temperature deformation and heat loss of the inner tube material, greatly prolongs the service life of the inner tube, and can effectively cooperate with the surrounding castable refractory materials to protect its overall integrity. The innovative and improved application of castables and sealing construction technology achieves good sealing and heat insulation, and technically solves the scouring, wear and heat loss of the inner tube and channel refractory materials of the fire-pulling hole caused by high-temperature, high-pressure dust-containing flue gas, greatly reduces the temperature of the fire-pulling hole and the surrounding platform, greatly reduces heat loss, and increases the service life of the fire-pulling hole structure, with obvious economic benefits such as energy saving and consumption reduction.

[0077] The double-chamber kiln fire-pulling hole structure 100 adopts a silicon carbide inner cylinder 20, which has high hardness, small expansion coefficient, good thermal shock resistance and high temperature resistance. When the kiln is stopped and the fire-pulling hole is opened for inspection and cleaning at high temperature, the silicon carbide inner cylinder 20 is not easy to break or burst; at the same time, the silicon carbide inner cylinder 20 will not burst under the rapid cooling and heating temperature changes when the kiln is stopped and opened; and under the high-pressure and high-temperature airflow during production operation, the silicon carbide inner cylinder 20 is not easy to be deformed by high temperature, damaged by heat, and damaged by erosion and embrittlement.

[0078] The double-chamber kiln fire extraction hole structure 100 adopts steel fiber reinforced corundum castable with good self-flow and high strength. The castable does not burst and is intact and stable as a whole. Moreover, the material of the silicon carbide inner tube 20 and the surrounding castable are the same refractory material, and the expansion coefficient is relatively close. The difference in the change of the expansion line at high temperature is small. In addition, the ceramic fiber cotton wrapped on the outer wall of the silicon carbide inner tube 20 is used as a buffer pad, which can better avoid the thermal stress caused by the thermal expansion of different materials to the extrusion damage of the castable. The castable material selection is improved to steel fiber reinforced corundum castable, which is resistant to high temperature and has good toughness, and can better adapt to the impact of high temperature and high pressure airflow.

[0079] The double-chamber kiln fire-pulling hole structure 100 has the technical effect of being stable in structure and not falling off. The barrel head 24 allows the barrel body 21 to be balanced and hung on the mounting seat 10, the barrel shoulder 22 allows the barrel body 21 to be firmly supported in the castable, and the barrel foot 23 can well support and seal the bottom of the castable to prevent the castable from falling off. At the same time, the V-shaped surrounding refractory bricks 30 form a funnel-shaped structure with a large top and a small bottom, which also allows the castable block to be firmly wrapped around the silicon carbide inner barrel 20, and will not fall, move, or fall off.

[0080] In summary, an embodiment of the present invention provides a double-chamber kiln fire extraction hole structure 100 and an assembly method. The double-chamber kiln fire extraction hole structure 100 includes a mounting seat 10, a silicon carbide inner cylinder 20 and a plurality of refractory bricks 30. The silicon carbide inner cylinder 20 is connected to the mounting seat 10. The plurality of refractory bricks 30 are arranged in a matrix outside the silicon carbide inner cylinder 20, and the plurality of refractory bricks 30 together form an outer cylinder. A cavity 40 is provided between the outer cylinder and the silicon carbide inner cylinder 20, and the cavity 40 is used to set the castable. When the double-chamber kiln fire-pulling hole structure 100 is in use, the silicon carbide inner cylinder 20 is connected to the mounting seat 10, and a casting material is arranged in the cavity 40 between the outer cylinder and the silicon carbide inner cylinder 20 for sealing. Compared with the inner cylinder in the prior art, the silicon carbide inner cylinder 20 has a stronger structural strength and better heat resistance, thereby improving the structural strength and heat resistance of the inner cylinder of the fire-pulling hole, alleviating the phenomenon of thermal damage to the inner cylinder of the fire-pulling hole, avoiding the escape or leakage of hot gas, and ensuring the safety of the double-chamber kiln during production and operation.

[0081] The assembly method of the double-chamber kiln fire extraction hole structure 100 includes assembling the silicon carbide inner cylinder 20 on the mounting seat 10, sealing the gap between the cylinder shoulder 22 and the mounting seat 10; stacking a plurality of refractory bricks 30 around the silicon carbide inner cylinder 20 to form an outer cylinder, and making the gap between the outer cylinder and the inner cylinder V-shaped; pouring the castable into the cavity 40 for sealing. The assembly method is simple to operate.

[0082] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A double-chamber kiln fire extraction hole structure, characterized in that: include: Mounting seat (10); A silicon carbide inner cylinder (20), the silicon carbide inner cylinder (20) being connected to the mounting seat (10); a plurality of refractory bricks (30), the plurality of refractory bricks (30) being arranged in a matrix outside the silicon carbide inner cylinder (20), and the plurality of refractory bricks (30) together forming an outer cylinder, a cavity (40) being provided between the outer cylinder and the silicon carbide inner cylinder (20), and the cavity (40) being used for arranging a castable; The silicon carbide inner cylinder (20) comprises a cylinder body (21) and a cylinder shoulder (22), wherein the cylinder shoulder (22) is arranged along the circumferential direction of the cylinder body (21) and connected to the outer wall of the cylinder body (21), and the cylinder shoulder (22) is used to support the cylinder body (21) in the castable; The thickness of the cylinder (21) ranges from 20 mm to 22 mm.

2. The double-chamber kiln fire extraction hole structure according to claim 1, characterized in that: The silicon carbide inner cylinder (20) further comprises a cylinder foot (23) and a cylinder head (24), wherein the cylinder foot (23) and the cylinder head (24) are both arranged along the circumferential direction of the cylinder body (21), the cylinder foot (23) is connected to the bottom edge of the cylinder body (21), the cylinder head (24) is connected to the top edge of the cylinder body (21), the cylinder head (24) is abutted against the mounting seat (10), and the cylinder foot (23) is used to seal with the bottom of the castable.

3. The double-chamber kiln fire extraction hole structure according to claim 2, characterized in that: The width of the cylinder foot (23) along the radial direction of the cylinder body (21) ranges from 25 mm to 35 mm.

4. The double-chamber kiln fire extraction hole structure according to claim 2, characterized in that: The thickness of the barrel foot (23) ranges from 30 mm to 32 mm.

5. The double-chamber kiln fire extraction hole structure according to claim 2, characterized in that: The thickness of the barrel head (24) ranges from 20 mm to 25 mm.

6. The double-chamber kiln fire extraction hole structure according to any one of claims 1 to 5, characterized in that: The cavity (40) is V-shaped.

7. A method for assembling a double-chamber kiln fire extraction hole structure, characterized in that: Used for assembling the double-chamber kiln fire extraction hole structure (100) according to any one of claims 1 to 6, the assembling method comprising: Assembling the silicon carbide inner cylinder (20) on the mounting seat (10) and sealing the gap between the cylinder shoulder (22) and the mounting seat (10); Stacking a plurality of refractory bricks (30) around the silicon carbide inner cylinder (20) to form an outer cylinder, and making the gap between the outer cylinder and the inner cylinder into a V shape; The casting material is poured into the cavity (40) for sealing.

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