Kiln head sealing device

Abstract

The utility model relates to cement production equipment's technical field especially, a kind of kiln head sealing device, the kiln head sealing device provided by the utility model includes kiln cylinder, fixed support, sleeve mechanism and gas pipeline, the outer peripheral side of kiln cylinder's discharge end is provided with kiln mouth iron, fixed support is set to the outer peripheral side of kiln cylinder, one end of fixed support is connected with kiln mouth iron, cooling passage is formed between fixed support and kiln cylinder;Sleeve mechanism is sleeved in the outer peripheral side of kiln cylinder, sleeve mechanism, fixed support and kiln cylinder are enclosed into annular cavity, annular cavity is communicated with cooling passage;One end of gas pipeline is communicated with sleeve mechanism, the other end is used to communicate external carbon dioxide gas source, the kiln head sealing device provided by the utility model effectively solves the problem that air leakage in full-oxygen combustion cement kiln leads to exhaust gas CO2 Concentration reduction, while guaranteeing kiln head cooling effect, maintains the purity of atmosphere of full-oxygen combustion process.

Description

Technical Field

[0001] This utility model relates to the technical field of cement production equipment, and in particular to a kiln head sealing device. Background Technology

[0002] With increasingly stringent global requirements for carbon emission reduction, the cement industry, as a significant source of carbon emissions, urgently needs to adopt advanced technologies to achieve carbon neutrality. Oxygen-based combustion technology, as an effective carbon capture pretreatment technology, significantly increases the CO2 concentration in kiln system exhaust gas by using pure oxygen instead of air for combustion, creating favorable conditions for subsequent carbon capture processes. However, the application of oxygen-based combustion technology in cement kilns faces technical challenges related to kiln head sealing.

[0003] In traditional cement kiln production, a kiln inlet liner is installed on the outer periphery of the kiln shell's discharge end. To prevent damage from high temperatures, the outer end face of the kiln inlet liner (on the side of the kiln head hood) is covered with refractory castable, and the outer side of the kiln inlet liner requires air cooling. The kiln head area typically uses an air cooling system to cool and protect high-temperature components such as the kiln inlet liner. As a key component connecting the kiln shell and the kiln head hood, the kiln inlet liner directly withstands the impact of hot air at approximately 1100°C inside the kiln head hood, and must be effectively cooled to prevent overheating deformation and damage. Traditional air cooling systems use fans to deliver external air into the kiln head sealing device, providing forced convection cooling to the kiln inlet liner and the kiln shell.

[0004] However, traditional air cooling systems have serious technical drawbacks for cement kilns using oxy-fuel combustion. Since a completely sealed system is impossible, air leakage into the kiln is inevitable when using air to cool the kiln inlet. This leaked air contains large amounts of inert gases such as nitrogen, which dilute the kiln atmosphere, directly affecting the purity of the oxy-fuel combustion process and leading to a significant decrease in CO2 concentration in the kiln system's exhaust gas.

[0005] The reduction in CO2 concentration has a significant impact on the economics and practicality of oxy-fuel combustion technology. In carbon capture processes, the CO2 concentration in the exhaust gas is a key factor determining the capture cost; the higher the CO2 concentration, the lower the subsequent separation and purification costs. When the CO2 concentration in the exhaust gas decreases due to air leakage, the carbon capture system needs to process more low-concentration gases, increasing energy consumption and operating costs, and also affecting the economic feasibility of combining oxy-fuel combustion technology with carbon capture technology.

[0006] Furthermore, air leakage can affect the stability of combustion conditions within the kiln, altering the kiln atmosphere composition and potentially negatively impacting clinker quality and production efficiency. Therefore, how to prevent the adverse effects of air leakage on the oxy-fuel combustion process while ensuring effective cooling of critical components such as the kiln inlet iron has become a crucial technical issue that urgently needs to be addressed in the widespread application of oxy-fuel combustion cement kiln technology. Utility Model Content

[0007] This utility model provides a kiln head sealing device, which effectively solves the problem of reduced CO2 concentration in exhaust gas caused by air leakage in oxy-fuel combustion cement kilns, and maintains the purity of the atmosphere in the oxy-fuel combustion process while ensuring the cooling effect of the kiln head.

[0008] This utility model provides a kiln head sealing device, comprising: a kiln body, with a kiln inlet iron provided on the outer periphery of the discharge end of the kiln body; a fixed bracket, provided on the outer periphery of the kiln body, one end of the fixed bracket being connected to the kiln inlet iron, and a cooling channel being formed between the fixed bracket and the kiln body; a sleeve mechanism, sleeved on the outer periphery of the kiln body, the sleeve mechanism, the fixed bracket, and the kiln body forming an annular cavity, the annular cavity being connected to the cooling channel; and a gas pipeline, one end of the gas pipeline being connected to the sleeve mechanism, and the other end being used to connect to an external carbon dioxide gas source.

[0009] In one possible implementation, the sleeve mechanism includes: a gas sleeve; two sealing components respectively disposed at both ends of the gas sleeve, one sealing component being sealed and fitted to the end of the fixed bracket away from the kiln body, and the other sealing component being sealed and fitted to the outer periphery of the kiln body.

[0010] In one possible implementation, the gas sleeve has a partition plate inside, which divides the annular cavity into a first chamber and a second chamber. An acceleration channel is provided between the first chamber and the second chamber, and the output end of the acceleration channel faces the cooling channel. The cooling channel is located in the second chamber, and the gas pipeline is connected to the first chamber.

[0011] In one possible implementation, the second chamber is provided with two gas passages, each extending to one of the two sealing components.

[0012] In one possible implementation, the sealing assembly includes: a sealing shell connected to a gas sleeve, the sealing shell having an installation groove on the side facing the kiln body; and graphite rings disposed in the installation groove; one graphite ring is sealed and fitted with a fixed bracket, and the other graphite ring is sealed and fitted with the kiln body.

[0013] In one possible implementation, the graphite ring includes a plurality of fan-shaped graphite blocks evenly distributed along the circumference, the plurality of fan-shaped graphite blocks forming a graphite ring; the sealing assembly further includes: an elastic clamping element disposed on the sealing shell for clamping the fan-shaped graphite blocks.

[0014] In one possible implementation, the joint between two adjacent sector graphite blocks is provided with a concave-convex interlocking structure.

[0015] In one possible implementation, the fixed support includes: a support ring fitted around the outer periphery of the kiln shell, one end of the support ring being connected to the kiln inlet iron, and a cooling channel being formed between the support ring and the kiln shell; a support frame disposed around the outer periphery of the support ring; and a wear-resistant plate disposed around the outer periphery of the support frame; wherein the sealing component is in a sealed fit with the wear-resistant plate.

[0016] In one possible implementation, the sleeve mechanism further includes a bracket assembly, one end of which is connected to the kiln head hood and the other end of which is connected to the gas sleeve. The bracket assembly and the fixed support form a dust collection channel that extends to a sealing assembly that fits against the fixed support.

[0017] In one possible implementation, the bracket assembly includes: an end plate connected to the kiln head hood; an inner cylinder fitted around the outer periphery of the support ring, one end of which is connected to the end plate; and an outer cylinder fitted around the outer periphery of the inner cylinder, one end of which is connected to the end plate. The support ring, inner cylinder, wear-resistant plate, and outer cylinder are arranged radially at intervals to create a reciprocating folding structure in the dust collection channel.

[0018] One possible implementation involves accelerating the channel tapering settings.

[0019] In one possible implementation, the external carbon dioxide source is a kiln tail exhaust gas treatment system.

[0020] This invention provides a kiln head sealing device that utilizes carbon dioxide instead of air as the cooling medium, creating a kiln head sealing device specifically designed for oxy-fuel combustion cement kilns. The cooling channel formed between the fixed support and the kiln shell is completely filled with carbon dioxide gas. The annular cavity enclosed by the sleeve mechanism, fixed support, and kiln shell is connected to the cooling channel. Gas pipelines introduce an external carbon dioxide source into the annular cavity, forming a complete carbon dioxide circulation cooling system. When the system is running, carbon dioxide circulates within the annular cavity, effectively cooling the kiln shell and kiln inlet iron through the cooling channel. In the event of unavoidable minor leaks, carbon dioxide, rather than air, enters the kiln, thus solving the problem of reduced CO2 concentration in the kiln system exhaust gas due to air leakage in traditional air cooling systems. This achieves the dual goals of maintaining the purity of the oxy-fuel combustion process atmosphere and cooling and protecting key components at the kiln head. By eliminating the interference of air leakage on the oxy-fuel combustion process, the carbon dioxide concentration in the kiln system exhaust gas can be maintained at a high level, providing high-quality feed gas for subsequent carbon capture processes. This significantly reduces the energy consumption and cost of carbon capture, promotes the effective integration of oxy-fuel combustion technology and carbon capture technology, and provides important technical support for the cement industry to achieve its carbon neutrality goal. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is a cross-sectional structural diagram of a kiln head sealing device provided by this utility model.

[0023] Figure 2 This is a schematic diagram of the upper part of a kiln head sealing device provided by this utility model.

[0024] Figure 3 This is a structural schematic diagram of the connection between a fixed bracket and a sealing component provided by this utility model.

[0025] Figure 4 This is a schematic diagram of the structure of a graphite ring provided by this utility model.

[0026] Figure 5 This is a schematic diagram of the structure of the joint of a fan-shaped graphite block provided by this utility model.

[0027] Figure label: 1. Kiln cylinder; 11. Kiln inlet iron; 2. Fixed bracket; 21. Support ring; 22. Support frame; 23. Wear-resistant plate; 3. Cooling channel; 4. Sleeve mechanism; 41. Gas sleeve; 411. Divider plate; 412. First chamber; 413. Second chamber; 414. Acceleration channel; 415. Gas channel; 42. Sealing assembly; 421. Sealing shell; 422. Graphite ring; 4221. Fan-shaped graphite block; 4222. Concave-convex insertion structure; 423. Elastic clamping element; 43. Bracket assembly; 431. End plate; 432. Inner cylinder; 433. Outer cylinder; 5. Gas pipeline; 6. Dust suppression channel; 7. Kiln head hood. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0029] The following is combined Figure 1-5 This utility model provides a kiln head sealing device, comprising: a kiln body 1, a fixed bracket 2, a sleeve mechanism 4, and a gas pipeline 5, wherein: A kiln inlet iron 11 is provided on the outer periphery of the discharge end of the kiln cylinder 1; The fixed support 2 is set on the outer periphery of the kiln body 1. One end of the fixed support 2 is connected to the kiln inlet iron 11, and a cooling channel 3 is formed between the fixed support 2 and the kiln body 1.

[0030] The sleeve mechanism 4 is sleeved on the outer periphery of the kiln body 1. The sleeve mechanism 4, the fixed support 2 and the kiln body 1 form an annular cavity, which is connected to the cooling channel 3. One end of the gas pipeline 5 is connected to the sleeve mechanism 4, and the other end is used to connect to an external carbon dioxide gas source.

[0031] In this invention, carbon dioxide is used as the cooling medium. A cooling channel 3 is formed between the fixed support 2 on the outer periphery of the kiln shell 1 and the kiln shell 1. The annular cavity enclosed by the sleeve mechanism 4, the fixed support 2, and the kiln shell 1 is connected to the cooling channel 3. A gas pipeline 5 introduces an external carbon dioxide gas source into the annular cavity, forming a complete carbon dioxide circulating cooling system. Through the circulating flow of carbon dioxide in the annular cavity, the kiln shell 1 is cooled via the cooling channel 3. Even if a small amount of leakage occurs, carbon dioxide, not air, enters the kiln, thus avoiding the adverse effects of air leakage on the oxy-fuel combustion process.

[0032] Specifically, the fixed bracket 2 is fixedly connected to the kiln inlet iron 11 and rotates together with the kiln shell 1, forming the rotating part; while the sleeve mechanism 4 is sleeved on the outer periphery of the kiln shell 1 and is fixedly installed, forming the fixed part. Carbon dioxide gas is introduced into the cavity and cooling channel 3 to cool the kiln inlet iron 11. Carbon dioxide seeps out through the gap between the fixed part and the rotating part, and the seeping carbon dioxide gas is discharged along with the gas at the output end of the kiln shell 1. This does not reduce the concentration of carbon dioxide; on the contrary, it increases the concentration of carbon dioxide. By increasing the concentration of carbon dioxide, the cost of capturing carbon dioxide is reduced.

[0033] In related technologies, traditional kiln head sealing devices use air as a cooling medium, and the air cools the kiln inlet iron 11 through a cooling system. However, in the all-oxygen combustion process, the air cooling system inevitably causes air to leak into the kiln. The leaked air contains a large amount of inert gases such as nitrogen, which dilutes the atmosphere inside the kiln and leads to a decrease in the concentration of carbon dioxide in the exhaust gas of the kiln system.

[0034] In this embodiment of the invention, carbon dioxide is used instead of air as the cooling medium, completely eliminating the air leakage problem. The carbon dioxide concentration in the kiln system exhaust gas is maintained at a high level, creating favorable conditions for subsequent carbon capture processes. The high concentration of carbon dioxide exhaust gas significantly reduces the energy consumption and cost of carbon capture, promoting the effective combination of oxy-fuel combustion technology and carbon capture technology.

[0035] The external carbon dioxide source is the kiln tail exhaust gas treatment system. By utilizing the large amount of carbon dioxide contained in the kiln tail exhaust gas, and treating it for use as a cooling medium, the system not only solves the problem of effective utilization of exhaust gas but also provides a stable gas supply for the cooling system, thereby realizing the resource utilization of exhaust gas and the circular economy of the system. Specifically, the kiln tail exhaust gas treatment system includes cooling equipment, dust removal equipment, and purification equipment, which cools and purifies the high-temperature exhaust gas discharged from the kiln tail, removing dust and harmful components and extracting pure carbon dioxide gas. The treated carbon dioxide is then transported through pipelines to the gas pipeline 5 of the kiln head sealing device, forming a gas recycling system from the kiln tail to the kiln head.

[0036] like Figure 2 As shown, in some embodiments, the sleeve mechanism 4 includes: a gas sleeve 41; two sealing components 42, respectively disposed at both ends of the gas sleeve 41, one of the sealing components 42 being sealed and fitted with the end of the fixed bracket 2 away from the kiln body 1, and the other sealing component 42 being sealed and fitted with the outer periphery of the kiln body 1.

[0037] In this invention, the sleeve mechanism 4 includes a gas sleeve 41 and two sealing components 42 respectively disposed at both ends of the gas sleeve 41. One sealing component 42 is sealed and fitted to the end of the fixed bracket 2 away from the kiln body 1, and the other sealing component 42 is sealed and fitted to the outer periphery of the kiln body 1. The two sealing components 42 perform different sealing functions, while allowing carbon dioxide to seep out in a suitable amount through the gaps in the sealing components 42, forming a positive pressure in the annular cavity, thereby preventing external gas or dust from entering the annular cavity through the gaps, thus achieving a dual sealing protection system.

[0038] Specifically, the sealing component 42, which is in contact with the fixed support 2, adopts an annular sealing structure. It forms a sealed fit with the fixed support 2 through surface contact or line contact, mainly to prevent large-scale leakage of carbon dioxide into the external environment. The sealing component 42, which is in contact with the outer periphery of the kiln shell 1, also adopts an annular sealing structure, forming a dynamic seal with the surface of the rotating kiln shell 1 to prevent high-temperature flue gas and dust inside the kiln from penetrating into the annular cavity. The trace amount of carbon dioxide seeping out through the gaps in the sealing component 42 ensures the continuous renewal of carbon dioxide and the maintenance of positive pressure within the annular cavity.

[0039] In one specific embodiment, the kiln shell 1 rotates during the operation of the cement kiln, and the sealing assembly 42 needs to maintain a good sealing effect under dynamic conditions. The arrangement of two sealing assemblies 42 achieves an effective combination of dynamic and static sealing, maintaining reliable sealing performance even when the kiln shell 1 is rotating.

[0040] In some embodiments, the gas sleeve 41 is provided with a partition plate 411 inside, which divides the annular cavity into a first chamber 412 and a second chamber 413. An acceleration channel 414 is provided between the first chamber 412 and the second chamber 413, and the output end of the acceleration channel 414 faces the cooling channel 3. The cooling channel 3 is located in the second chamber 413, and the gas pipeline 5 is connected to the first chamber 412.

[0041] In this invention, a partition plate 411 inside the gas sleeve 41 divides the annular cavity into a first chamber 412 and a second chamber 413. An acceleration channel 414 is provided between the first chamber 412 and the second chamber 413, with the output end of the acceleration channel 414 facing the cooling channel 3, which is located inside the second chamber 413. The gas pipeline 5 is connected to the first chamber 412. Through this chamber design and directional airflow control, graded control and directional delivery of gas flow are achieved, thereby improving cooling efficiency.

[0042] Specifically, the partition plate 411 adopts an annular partition structure, dividing the originally connected annular cavity into two relatively independent chambers. The first chamber 412 serves as a gas buffer zone and is connected to the external gas pipeline 5 via a pipe. The acceleration channel 414 has a converging channel structure, with one end connected to the first chamber 412 and the other end opening into the second chamber 413 and facing the cooling channel 3. The second chamber 413 is the main gas action area, and the cooling channel 3 is located within this chamber, directly opposite the surface of the kiln shell 1.

[0043] In one specific embodiment, the partition plate 411 allows the first chamber 412 to maintain a relatively stable pressure, providing a stable air supply to the system. The high-speed airflow generated by the acceleration channel 414 creates strong convective heat transfer in the second chamber 413, significantly improving the cooling effect, especially for the cooling and protection of critical components such as the kiln inlet iron 11. The chamber structure, combined with the acceleration channel 414, achieves precise control of gas flow, eliminates dead zones in the airflow, ensures uniform and sufficient cooling, and improves the overall performance of the cooling system.

[0044] In some embodiments, the acceleration channel 414 is tapered.

[0045] In this invention, the acceleration channel 414 is gradually narrowed. By gradually reducing the cross-sectional area, continuous acceleration of gas flow velocity and reasonable pressure distribution are achieved. Based on fluid mechanics principles, this avoids flow losses that may occur due to sudden narrowing, thereby improving gas transport efficiency.

[0046] Specifically, the tapering geometry of the acceleration channel 414 includes an inlet section, an outlet section, and an intermediate transition section. The cross-sectional area of ​​the transition section gradually decreases along the axial direction, forming a convergent channel. This geometry allows the gas velocity to gradually increase as it passes through, avoiding pressure spikes and eddy currents caused by abrupt contraction. The smooth velocity change reduces flow resistance.

[0047] In some embodiments, the second chamber 413 is provided with two gas passages 415, which extend to two sealing components 42 respectively.

[0048] In this invention, the second chamber 413 is provided with two gas channels 415, which extend to two sealing components 42 respectively. By providing independent positive pressure gas protection for each sealing component 42, the positive pressure prevents external gas or dust from entering the annular cavity through the gaps in the sealing components 42, thereby ensuring the cleanliness and sealing performance of the cooling system.

[0049] Specifically, the two gas channels 415 are tubular or trough-shaped gas delivery channels, extending from different positions in the second chamber 413 to the corresponding sealing assembly 42. The sealing assembly 42 adjacent to the kiln opening iron 11 receives positive pressure carbon dioxide protection through the corresponding gas channel 415, while the other sealing assembly 42 receives positive pressure protection through the other gas channel 415. The outlet of the gas channel 415 is located near the sealing contact surface of the sealing assembly 42, forming an outward positive pressure airflow.

[0050] In one specific embodiment, the cement kiln generates a large amount of dust during operation, and the rotation of the kiln shell 1 creates tiny gaps at the sealing interface. The positive pressure protection provided by the two gas channels 415 creates an outward airflow at the sealing assembly 42, effectively preventing the intrusion of dust and external air and maintaining the purity of the gas within the annular cavity. By combining positive pressure gas protection with physical sealing, an active protection mechanism is formed. Even with tiny gaps in the sealing assembly 42, the positive pressure airflow can effectively prevent the intrusion of harmful media, significantly improving the protective effect of the sealing system.

[0051] like Figure 3As shown, in some embodiments, the sealing assembly 42 includes: a sealing shell 421 connected to the gas sleeve 41, the sealing shell 421 having an installation groove on the side facing the kiln body 1; a graphite ring 422 disposed in the installation groove; one graphite ring 422 being sealed and fitted with the fixed bracket 2, and the other graphite ring 422 being sealed and fitted with the kiln body 1.

[0052] In this invention, the sealing assembly 42 includes a sealing shell 421 connected to the gas sleeve 41 and a graphite ring 422 disposed in the mounting groove of the sealing shell 421. One graphite ring 422 is sealed and fitted with the fixed bracket 2, and the other graphite ring 422 is sealed and fitted with the kiln shell 1. The sealing shell 421 provides structural support and precise positioning, while the graphite ring 422 undertakes the actual sealing function, thus achieving a reasonable division of labor between structure and function.

[0053] Specifically, the sealing shell 421 is a ring-shaped metal shell structure, connected to the gas sleeve 41 by bolts, welding, or flanges. An annular mounting groove is formed on the side of the sealing shell 421 facing the kiln shell 1, the depth and width of which match the dimensions of the graphite ring 422. The graphite ring 422 is an annular sealing element made of graphite material, embedded in the mounting groove and forming a contact seal with the sealing surface.

[0054] In this embodiment of the invention, the surface temperature of the kiln shell 1 can reach several hundred degrees Celsius during cement kiln operation. Ordinary sealing materials would rapidly age and fail under such high temperatures. The graphite ring 422, with its high-temperature resistance, can operate stably for extended periods in high-temperature environments. Simultaneously, the self-lubricating properties of graphite reduce friction and wear on the sealing surface. The use of the graphite ring 422 fully utilizes the unique advantages of graphite materials in high-temperature applications, significantly improving the reliability and service life of the sealing system in high-temperature environments.

[0055] like Figure 4 As shown, in some embodiments, the graphite ring 422 includes a plurality of fan-shaped graphite blocks 4221 evenly distributed along the circumference, and the plurality of fan-shaped graphite blocks 4221 form a ring structure; the sealing assembly 42 further includes: an elastic clamping member 423, which is disposed on the sealing shell 421 and is used to clamp the fan-shaped graphite blocks 4221.

[0056] In this invention, the graphite ring 422 includes multiple fan-shaped graphite blocks 4221 evenly distributed circumferentially, forming an annular structure. The sealing assembly 42 also includes an elastic clamping element 423 disposed on the sealing shell 421 for pressing the fan-shaped graphite blocks 4221. The segmented structure solves the manufacturing and installation problems of the large-diameter integral graphite ring 422. The elastic clamping element 423 achieves automatic wear compensation, thereby improving the practicality and reliability of the sealing system. Specifically, the multiple fan-shaped graphite blocks 4221 are graphite parts with wedge-shaped or fan-shaped cross-sections, evenly distributed circumferentially and spliced ​​to form a complete annular structure. The elastic clamping element 423 includes a spring, elastic washer, or other element with elastic restoring force, installed at corresponding positions on the sealing shell 421 to apply radial clamping force to the fan-shaped graphite blocks 4221. When the graphite blocks reduce in thickness due to wear, the elastic clamping element 423 can compensate for this wear change and automatically clamp.

[0057] In one specific embodiment, during the long-term operation of the cement kiln, the graphite ring 422 will gradually wear and thin due to friction. The elastic clamping element 423 can sense the wear changes and automatically adjust the clamping force, so that the graphite ring 422 can maintain effective sealing contact throughout the entire service life, thus extending the service life of the sealing system.

[0058] like Figure 5 As shown, in some embodiments, a concave-convex insertion structure 4222 is provided at the junction of two adjacent fan-shaped graphite blocks 4221.

[0059] In this invention, a concave-convex insertion structure 4222 is provided at the joint of two adjacent fan-shaped graphite blocks 4221. The concave-convex insertion structure 4222 plays a guiding role during the wear process of the graphite blocks, ensuring that the graphite blocks maintain the correct radial position after wear. Simultaneously, it forms an overlapping labyrinth seal between adjacent graphite blocks, thereby achieving precise positioning and continuous sealing between the graphite blocks. Specifically, the concave-convex insertion structure 4222 includes a protruding portion on the end face of one fan-shaped graphite block 4221 and corresponding grooved portions on the end faces of adjacent fan-shaped graphite blocks 4221. The shape and size of the protrusion and groove match to form an insertion fit. When the graphite blocks need to move towards the kiln shell 1 due to wear, the concave-convex insertion structure 4222 provides a guiding role through geometric constraints, ensuring the accuracy of the movement direction. At the same time, the insertion structure forms an overlapping fit at the joint, preventing leakage at the joint.

[0060] In one specific embodiment, the graphite ring 422 may reduce in thickness due to friction and wear during long-term use, requiring it to move towards the sealing surface to maintain contact. The interlocking structure 4222 ensures the directionality and accuracy of this movement, preventing misalignment or detachment of the graphite block, while maintaining the structural integrity of the entire graphite ring 422.

[0061] In some embodiments, the fixed bracket 2 includes: a support ring 21, which is sleeved on the outer periphery of the kiln body 1, one end of the support ring 21 is connected to the kiln inlet iron 11, and a cooling channel 3 is formed between the support ring 21 and the kiln body 1; a support frame 22, which is disposed on the outer periphery of the support ring 21; and a wear-resistant plate 23, which is disposed on the outer periphery of the support frame 22; wherein the sealing component 42 is sealed and fitted with the wear-resistant plate 23.

[0062] In this invention, the fixed bracket 2 includes a support ring 21 sleeved around the outer periphery of the kiln shell 1, a support frame 22 disposed around the outer periphery of the support ring 21, and a wear-resistant plate 23 disposed around the outer periphery of the support frame 22. One end of the support ring 21 is connected to the kiln inlet iron 11, forming a cooling channel 3 between the support ring 21 and the kiln shell 1. The sealing component 42 is sealed and fitted to the wear-resistant plate 23. The concentric arrangement of the support ring 21 and the kiln shell 1 ensures the uniformity of the cooling channel 3, achieving direct cooling of the kiln inlet iron 11, thereby improving cooling efficiency and the functional zoning of the structure.

[0063] Specifically, the support ring 21 is a ring-shaped metal structure, concentrically fitted onto the outer circumference of the kiln shell 1, with one end connected to the kiln inlet iron 11 via bolts, welding, or other methods. The support frame 22 is a frame or truss structure, fixed to the outer circumference of the support ring 21, used to support and fix other components. The wear-resistant plate 23 is a flat or curved wear-resistant material component, installed on the outer circumference of the support frame 22, forming a contact surface with the sealing assembly 42. The annular gap between the support ring 21 and the kiln shell 1 forms the cooling channel 3, providing flow space for carbon dioxide gas.

[0064] In one specific embodiment, the kiln mouth iron 11, as a key component of the kiln head, directly bears the high-temperature radiation and impact inside the kiln. The cooling channel 3 between the support ring 21 and the kiln shell 1 can directly cool the area of ​​the kiln mouth iron 11, effectively reducing the working temperature of the kiln mouth iron 11 and preventing deformation and damage caused by overheating. The cooling channel 3 formed by the concentric configuration of the support ring 21 and the kiln shell 1 achieves direct and precise cooling of the kiln mouth iron 11, significantly improving cooling efficiency and effectively extending the service life of the kiln mouth iron 11.

[0065] In some embodiments, the sleeve mechanism 4 further includes a bracket assembly 43, one end of which is connected to the kiln head hood 7 and the other end is connected to the gas sleeve 41. The bracket assembly 43 and the fixed bracket 2 form a dust collection channel 6, which extends to a sealing assembly 42 that fits against the fixed bracket 2.

[0066] In this invention, the sleeve mechanism 4 further includes a bracket assembly 43. One end of the bracket assembly 43 is connected to the kiln head hood 7, and the other end is connected to the gas sleeve 41. The bracket assembly 43 and the fixed bracket 2 form a dust collection channel 6, which extends to the sealing assembly 42 that is in contact with the fixed bracket 2. The dust collection channel 6 provides a path for collecting and guiding external dust, preventing dust from entering the sealing system and thus protecting the sealing assembly 42 from dust impact and wear.

[0067] Specifically, the bracket assembly 43 is a frame-type or cylindrical structural component. One end is connected to the kiln head hood 7 via flange or bolt connection, while the other end is connected to the gas sleeve 41 via welding or bolt connection, forming a complete structural support system. The space between the bracket assembly 43 and the fixed bracket 2 is designed with a reasonable geometry to form a dust settling channel 6. This channel guides dust settling and discharge, and its end extends to the sealing assembly 42, which is in contact with the fixed bracket 2.

[0068] In one specific embodiment, a large amount of fly sand and dust are generated during cement production. If this dust enters the sealing system, it will exacerbate the wear of the sealing component 42 and affect the sealing effect. The dust collection channel 6 is set up to collect and guide the dust before it reaches the sealing component 42, thus protecting the cleanliness of the sealing system.

[0069] In some embodiments, the bracket assembly 43 includes: an end plate 431 connected to the kiln head hood 7; an inner cylinder 432 sleeved on the outer periphery of the support ring 21, one end of the inner cylinder 432 being connected to the end plate 431; and an outer cylinder 433 sleeved on the outer periphery of the inner cylinder 432, one end of the outer cylinder 433 being connected to the end plate 431; wherein the support ring 21, the inner cylinder 432, the wear-resistant plate 23, and the outer cylinder 433 are arranged radially at intervals to make the dust collection channel 6 have a reciprocating folding structure.

[0070] In this invention, the bracket assembly 43 includes an end plate 431 connected to the kiln head hood 7, an inner cylinder 432 sleeved around the support ring 21, and an outer cylinder 433 sleeved around the inner cylinder 432. One end of both the inner cylinder 432 and the outer cylinder 433 is connected to the end plate 431. The support ring 21, the inner cylinder 432, the wear-resistant plate 23, and the outer cylinder 433 are arranged radially at intervals, giving the dust collection channel 6 a reciprocating folded structure. This reciprocating folded channel design achieves multi-stage separation and efficient collection of dust, thereby significantly improving dust collection efficiency.

[0071] Specifically, end plate 431 is a flat structural component, connected to kiln head hood 7 by bolts or welding. Inner cylinder 432 is a cylindrical or polygonal structure, concentrically fitted around the outer circumference of support ring 21, with one end connected to end plate 431. Outer cylinder 433 is also a cylindrical structure, fitted around the outer circumference of inner cylinder 432, with one end connected to end plate 431. Support ring 21, inner cylinder 432, wear-resistant plate 23, and outer cylinder 433 are arranged radially at intervals, forming multiple interconnected but directionally changing channel sections, requiring airflow to undergo multiple directional changes within the channels. A dust hopper is installed on support ring 21 to collect settled dust.

[0072] In one specific embodiment, the reciprocating dust collection channel 6 significantly extends the airflow path, increasing the residence time of dust within the channel and allowing ample time for settling and separation. Each bend serves as a dust separation point, and multi-stage separation ensures thorough dust collection. The reciprocating structure, by extending the airflow path and increasing the number of separation stages, significantly improves dust collection efficiency. Combined with the collection function of the dust hopper, it achieves effective dust capture and removal, providing a clean working environment for the sealing system.

[0073] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A kiln head sealing device, characterized in that, include: Kiln cylinder (1), and a kiln inlet iron (11) is provided on the outer periphery of the discharge end of the kiln cylinder (1). A fixed bracket (2) is provided on the outer periphery of the kiln body (1). One end of the fixed bracket (2) is connected to the kiln inlet iron (11). A cooling channel (3) is formed between the fixed bracket (2) and the kiln body (1). A sleeve mechanism (4) is sleeved on the outer periphery of the kiln body (1). The sleeve mechanism (4), the fixed bracket (2), and the kiln body (1) form an annular cavity, which is connected to the cooling channel (3). Gas pipeline (5), one end of which is connected to the sleeve mechanism (4), and the other end is used to connect to an external carbon dioxide gas source.

2. The kiln head sealing device according to claim 1, characterized in that, The sleeve mechanism (4) includes: Gas sleeve (41); Two sealing components (42) are respectively disposed at both ends of the gas sleeve (41). One of the sealing components (42) is sealed and fitted to the end of the fixed bracket (2) away from the kiln body (1), and the other sealing component (42) is sealed and fitted to the outer periphery of the kiln body (1).

3. The kiln head sealing device according to claim 2, characterized in that, The gas sleeve (41) is provided with a partition plate (411) inside, which divides the annular cavity into a first chamber (412) and a second chamber (413). An acceleration channel (414) is provided between the first chamber (412) and the second chamber (413), and the output end of the acceleration channel (414) faces the cooling channel (3). The cooling channel (3) is located in the second chamber (413), and the gas pipeline (5) is connected to the first chamber (412).

4. The kiln head sealing device according to claim 3, characterized in that, The second chamber (413) is provided with two gas channels (415), which extend to the two sealing components (42) respectively.

5. The kiln head sealing device according to claim 2, characterized in that, The sealing assembly (42) includes: A sealing shell (421) is connected to the gas sleeve (41), and the sealing shell (421) has an installation groove on the side facing the kiln body (1); A graphite ring (422) is disposed in the mounting groove; One of the graphite rings (422) is sealed to the fixed bracket (2), and the other graphite ring (422) is sealed to the kiln body (1).

6. The kiln head sealing device according to claim 5, characterized in that, The graphite ring (422) includes a plurality of fan-shaped graphite blocks (4221) evenly distributed along the circumference, and the plurality of fan-shaped graphite blocks (4221) surround the graphite ring (422); the sealing assembly (42) further includes an elastic clamping member (423), which is disposed on the sealing shell (421) and is used to clamp the fan-shaped graphite blocks (4221).

7. The kiln head sealing device according to claim 6, characterized in that, The joint between two adjacent fan-shaped graphite blocks (4221) is provided with a concave-convex insertion structure (4222).

8. The kiln head sealing device according to any one of claims 2-7, characterized in that, The fixed bracket (2) includes: A support ring (21) is fitted around the outer periphery of the kiln body (1). One end of the support ring (21) is connected to the kiln inlet iron (11). The cooling channel (3) is formed between the support ring (21) and the kiln body (1). The support frame (22) is disposed on the outer periphery of the support ring (21); Wear-resistant plate (23) is disposed on the outer periphery of the support frame (22); The sealing component (42) is sealed and fitted with the wear-resistant plate (23).

9. The kiln head sealing device according to claim 8, characterized in that, The sleeve mechanism (4) further includes a bracket assembly (43), one end of which is connected to the kiln head hood (7) and the other end is connected to the gas sleeve (41). The bracket assembly (43) and the fixed bracket (2) form a dust collection channel (6), which extends to the sealing assembly (42) that is in contact with the fixed bracket (2).

10. The kiln head sealing device according to claim 9, characterized in that, The bracket assembly (43) includes: End plate (431) is connected to the kiln head cover (7); The inner cylinder (432) is sleeved on the outer periphery of the support ring (21), and one end of the inner cylinder (432) is connected to the end plate (431); An outer cylinder (433) is fitted around the outer periphery of an inner cylinder (432), and one end of the outer cylinder (433) is connected to the end plate (431); The support ring (21), the inner cylinder (432), the wear-resistant plate (23) and the outer cylinder (433) are arranged radially at intervals so that the dust collection channel (6) has a reciprocating folding structure.

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