Coke cleaning device of rotary kiln

Abstract

The decoking device is used for decoking the rotary kiln, the decoking device is arranged in the rotary kiln in the axial direction of the rotary kiln, the decoking device comprises a device body, the device body is provided with a decoking part, and the decoking part is arranged on the side, close to the inner wall of the rotary kiln, of the device body in the circumferential direction of the rotary kiln. When the device body freely rotates and rolls along with the rotary kiln under the influence of gravity, the decoking part is propped against the inner wall of the rotary kiln and slides relative to the inner wall of the rotary kiln due to the influence of the gravity on the device body. The decoking device is integrally arranged in the rotary kiln, so that the decoking device rotates along with the rotary kiln under the influence of gravity, and decoking is carried out through relative sliding. An opening does not need to be formed in the wall of the rotary kiln, so that online decoking is achieved while the sealing performance of the rotary kiln is not affected, the decoking part still keeps sliding contact with the inner wall of the rotary kiln under the condition that the decoking part is abraded due to self weight, the effective decoking time can be prolonged, environmental protection is achieved, maintenance is easy, and stability is improved.

Description

Technical Field

[0001] The invention relates to the technical field of rotary kilns, and in particular to a coke cleaning device for a rotary kiln. Background Art

[0002] In industrial production, rotary kiln is an important thermal equipment, widely used in building materials, metallurgy, chemical industry and other fields, such as cement clinker production, lime burning and pyrolysis process of organic waste. The inside of the rotary kiln is usually in a high temperature, high load and highly corrosive working environment, and some processes will produce high viscosity by-products such as tar. After long-term operation, coke is easily formed on the inner wall and refractory surface. The formation of coke will affect the heat transfer efficiency of the rotary kiln, causing serious problems such as local overheating of the kiln body, damage to refractory materials and even deformation of the kiln body.

[0003] The existing rotary kiln coke cleaning methods can be divided into manual / mechanical coke cleaning during shutdown and online coke cleaning. De-coke cleaning during shutdown seriously affects the continuous operation of the equipment. The existing online coke cleaning device applied to the rotary kiln needs to be fixed outside the rotary kiln, which brings about additional sealing requirements. After searching, it was found that the Chinese patent with publication number CN213066124U discloses a rotary kiln head coke cleaning device, which uses a reduction motor to drive the connecting rod structure to rotate the cleaning push rod for cleaning. The operating stability of the connecting rod mechanism is difficult to ensure under high temperature and partially tar-containing working conditions. Maintenance and replacement require shutdown for maintenance, and it is difficult to ensure the sealing of the connection between the connecting rod mechanism and the rotary kiln. The Chinese patent with publication number CN220380295U discloses an online coke cleaning device at the tail of the rotary kiln. The device drives the grate and the inner wall of the rotary kiln to rotate relative to each other through a transmission rod passing through the side wall of the secondary combustion chamber, thereby realizing online coke cleaning at the tail of the kiln. This method is only applicable to rotary kiln equipment with a secondary combustion chamber, and can only act on the kiln tail part, and is not applicable to other parts of the rotary kiln. The Chinese patent with publication number CN113654064A discloses a solid waste incineration rotary kiln coke cleaning device, which is fixed to the wall of the secondary combustion chamber and does not rotate with the rotary kiln. The coke cleaner is not in direct contact with the inner wall of the rotary kiln, and a gap is left to prevent it from getting stuck. The device is a non-powered device, energy-saving and environmentally friendly, but it can only act on the kiln tail of a rotary kiln with a secondary combustion chamber, and is not applicable to other parts of the rotary kiln, and it is still impossible to avoid stopping for coke cleaning. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a rotary kiln coke cleaning device to overcome the defects of the prior art coke cleaning device that creates additional sealing requirements for the rotary kiln, requires shutdown for coke cleaning, and has poor operating stability.

[0005] The present invention solves the above technical problems through the following technical solutions:

[0006] A coke cleaning device for a rotary kiln is used for cleaning the rotary kiln. The coke cleaning device is arranged in the rotary kiln along the axial direction of the rotary kiln. The coke cleaning device comprises a device body. The device body is provided with a coke cleaning portion. The coke cleaning portion is arranged on one side of the device body close to the inner wall of the rotary kiln along the circumference of the rotary kiln, so that when the device body is affected by gravity and freely rotates and rolls with the rotary kiln, the coke cleaning portion abuts against the inner wall of the rotary kiln and slides relative to the inner wall of the rotary kiln due to the influence of gravity on the device body.

[0007] In this solution, the coke cleaning device is placed as a whole in the rotary kiln so that the coke cleaning device rotates with the rotary kiln under the influence of gravity, and the coke-like material attached to the inner wall of the rotary kiln is scraped off by the relative sliding of the coke cleaning part and the inner wall of the rotary kiln, thereby achieving coke cleaning. The device has no external structure of the rotary kiln, and there is no need to consider the damage of the motor drive parts or connecting rods and other mechanisms under high temperature conditions, and there is no need to open the wall of the rotary kiln, so that online coke cleaning can be achieved without affecting the sealing of the rotary kiln. The coke cleaning device drives the coke cleaning by its own weight, and the device itself has no power demand. The coke cleaning part is always in contact with the inner wall of the rotary kiln, so that the coke cleaning part can still maintain sliding contact with the inner wall of the rotary kiln when it is worn, which can extend the effective coke cleaning time, improve the stability of the device operation, and is environmentally friendly and easy to maintain.

[0008] Preferably, the size of the coke cleaning device along the radial direction of the rotary kiln is smaller than the inner diameter of the rotary kiln.

[0009] In this solution, the size of the coke cleaning device is made smaller than the inner diameter of the rotary kiln to leave a margin for the coke cleaning device to jump. When the coke cleaning device is stuck during rotation, the coke cleaning device is allowed to adjust its position by jumping or rolling to release the jam. Under high tar conditions, high-viscosity tar may appear locally on the inner wall of the rotary kiln. When the coke cleaning part cannot scrape off the tar smoothly or gets stuck, due to the existence of the jump margin, the coke cleaning device can roll over the tar part and continue to roll with the rotation of the rotary kiln, thereby preventing the coke cleaning device from losing the coke cleaning effect after getting stuck and reducing the frequency of maintenance required by personnel.

[0010] Preferably, the coke cleaning device is parallel to the rotary kiln along the axial direction of the rotary kiln and eccentrically arranged in the rotary kiln.

[0011] In the present scheme, the coke cleaning device is arranged parallel to the rotary kiln along the axial direction of the rotary kiln and eccentrically in the rotary kiln to leave a margin for the coke cleaning device to jump. Due to the size difference between the rotary kiln and the coke cleaning device and the eccentric arrangement, the rotation frequency and linear speed of the coke cleaning device and the rotary kiln are different, which promotes the relative sliding of the coke cleaning part of the coke cleaning device and the inner wall of the rotary kiln, thereby increasing the coke cleaning effect.

[0012] Preferably, the device body is further provided with a limit matching portion, and the limit matching portion is distributed on the outer side of the device body along the circumference of the rotary kiln;

[0013] The inner wall of the rotary kiln is provided with a protrusion protruding toward the center of the rotary kiln to form a stopper; the stopper extends along the axial direction of the rotary kiln;

[0014] Preferably, the length of the stopper along the radial direction of the rotary kiln is smaller than the difference between the inner diameter of the rotary kiln and the size of the coke cleaning device;

[0015] The process of the device body rotating with the rotary kiln includes the first working condition and the second working condition.

[0016] In the first working condition, the axial connection piece is separated from the stopper, and the device body can rotate naturally with the rotary kiln and clear the coke through relative sliding;

[0017] When the limiting matching part contacts the limiter during the rotation of the device body in the first working condition, the device enters the second working condition;

[0018] In the second working condition, the stopper abuts against the stopper matching portion, so that the rotation of the device body is blocked and the device body rotates synchronously with the rotary kiln under the influence of the stopper;

[0019] In the second working condition, the device body is lifted to a certain height by the limiter, the relative position of the limiter matching part and the limiter changes, the device body breaks away from the limit and falls to the rotary kiln, and can continue to rotate and return to the first working condition.

[0020] In this scheme, a limiter is arranged on the cylinder wall of the rotary kiln, and the limiter is periodically brought into contact with the limit fitting part to lift the decoking device, and then the decoking device is allowed to fall naturally. During the falling process, the gravitational potential energy is converted into mechanical energy, thereby impacting the coke deposits on the cylinder wall, increasing the decoking strength, and preventing the situation in which, under high tar conditions, the normal load provided by the decoking device's own weight is insufficient to remove the high-viscosity coke deposits from the cylinder wall, thereby preventing the occurrence of ineffective decoking.

[0021] Among them, in the first working condition, the coke cleaning device maintains a rotating posture before contacting the limiter, and the limit fitting part slides relatively with the inner wall of the barrel. As the rotary kiln rotates, the coke cleaning device contacts the limiter, that is, the limit fitting part abuts against the limiter, and enters the second working condition. The coke cleaning device is affected by the limiter and rotates synchronously with the rotary kiln. When the coke cleaning device is lifted to a certain height by the limiter, the vertical component force provided by the limiter is not enough to overcome the gravity on the coke cleaning device. The coke cleaning device then slides, falls and impacts the coke-like material on the wall of the rotary kiln barrel, and continues to rotate to clean coke, returning to the first working condition;

[0022] The radial length of the stopper is smaller than the difference between the inner diameter of the rotary kiln and the size of the coke cleaning device, so as to prevent the coke cleaning device from getting stuck after abutting against the stopper and always rotating synchronously with the rotary kiln, making it impossible to clean the coke.

[0023] Preferably, the device body is further provided with an axial connector extending along the axial direction of the rotary kiln and a radial connector extending along the radial direction of the rotary kiln, the radial connectors are provided at both ends of the device body along the axial direction of the rotary kiln, and the two ends of the axial connector are respectively fixedly connected to the radial connectors at both ends of the device body; the axial connector and the radial connector form the outer contour of the device body, and the coke cleaning part is provided on one side of the axial connector close to the inner wall of the rotary kiln;

[0024] In this solution, an axial connector extending along the axial direction of the rotary kiln and a radial connector extending along the radial direction of the rotary kiln are provided to form a cage-shaped frame of the outer contour of the device body. The radial connector and the axial connector are arranged and supported each other to ensure the structural strength of the coke cleaning device. The frame structure with gaps allows the device body to rotate with the rotary kiln while reducing the volume of the coke cleaning device occupying the material storage space inside the rotary kiln itself. Among them, each axial connector is provided with a coke cleaning part on one side close to the inner wall of the rotary kiln, so that the coke cleaning part abuts against the inner wall of the rotary kiln and scrapes off the coke on the inner wall when the device body rotates circumferentially with the rotary kiln.

[0025] Preferably, the device body is provided with a connecting part, which is arranged at the center of the end faces of the two ends of the device body along the axial direction. The connecting part is plate-shaped. With the connecting part as the center, along the radial direction of the rotary kiln, one end of a plurality of radial connecting members is fixedly connected to the connecting part, and the other end extends from the connecting part to the inner wall of the rotary kiln and is evenly distributed along the circumferential direction of the rotary kiln.

[0026] In this solution, a plate-shaped connecting portion is provided at the center of the end faces at both ends of the device body along the circumferential direction, so that the radial connecting parts can be connected to each other through the connecting portion and form end face frames at both ends of the device body, thereby increasing the structural strength and durability of the decoking device.

[0027] Preferably, the coke cleaning device comprises a plurality of device bodies, and the plurality of device bodies are arranged in sequence along the axial direction of the rotary kiln.

[0028] In this solution, multiple device bodies are arranged inside the rotary kiln as needed, so as to adjust the effective length range of coke cleaning; multiple device bodies are arranged inside the rotary kiln, and while maintaining unpowered online coke cleaning, there is no need to open an inner wall of the rotary kiln, thereby ensuring the sealing and achieving full-length coke cleaning of the rotary kiln. By adjusting the number of device bodies, the coke cleaning requirements of rotary kilns of different length specifications can be met, which is conducive to achieving full-length coke cleaning of the rotary kiln.

[0029] Preferably, the device body is provided with a connecting portion, which is provided at the center of the end surfaces of both ends of the device body along the axial direction, the connecting portion is plate-shaped, and the radius of the connecting portion is greater than the distance that the center of the connecting portion deviates from the central axis of the rotary kiln;

[0030] When the device body moves along the axial direction of the rotary kiln, the connecting parts of adjacent device bodies abut against each other, so that the movement of the device body along the axial direction of the rotary kiln is restricted.

[0031] In this solution, a plate-shaped connection part is provided at the center of the end surface of both ends of the device body in the circumferential direction, so that when multiple device bodies are arranged in the axial direction in the rotary kiln, when the device body moves axially, the connection parts of adjacent device bodies abut against each other, thereby preventing further collision between the device bodies and preventing the frames between the device bodies from interfering with each other, thereby affecting coke cleaning or getting stuck. Among them, the radius of the connection part is greater than the distance that the center of the connection part deviates from the central axis of the rotary kiln, so that even if the device body bounces due to the eccentric setting, the connection parts can still play a normal axial abutment and limiting role, thereby preventing interference between the device bodies.

[0032] Preferably, the device body includes radial connectors, with the connecting portion as the center, along the radial direction of the rotary kiln, one end of a plurality of radial connectors is fixedly connected to the connecting portion, and the other end extends from the connecting portion to the inner wall of the rotary kiln and is evenly distributed along the circumferential direction of the rotary kiln.

[0033] In this solution, a plate-shaped connecting portion is provided at the center of the end faces at both ends of the device body along the circumferential direction, so that the radial connecting parts can be connected to each other through the connecting portion and form end face frames at both ends of the device body, thereby increasing the structural strength and durability of the decoking device.

[0034] Preferably, the coke cleaning part is a scraper, and the scraper is made of wear-resistant material, and the hardness of the wear-resistant material is less than the hardness of the inner wall of the rotary kiln.

[0035] In this scheme, a scraper is used as a coke cleaning part to scrape off the coke-like substances on the inner wall of the rotary kiln for coke cleaning. The scraper is made of wear-resistant material to improve the durability and coke cleaning effect of the coke cleaning device; the hardness of the wear-resistant material in the coke cleaning working state is less than the hardness of the inner wall of the rotary kiln, so as to prevent the scraper from scratching the inner wall of the rotary kiln.

[0036] Preferably, the device body is provided with at least one counterweight, which is arranged on a side of the device body away from the inner wall of the rotary kiln, and when multiple counterweights are provided, the counterweights are arranged asymmetrically relative to the center of the device body.

[0037] In this solution, a counterweight is provided on the device body, so that the overall center of gravity of the coke cleaning device is deviated from the axis of the rotary kiln through local counterweight, so as to avoid the coke cleaning device and the rotary kiln rotating in the same cycle for a long time and causing relative movement failure and jamming during the relative movement between the material in the rotary kiln and the coke cleaning device. The asymmetric setting of the counterweight increases the influence of gravity on the coke cleaning device during rotation and the asynchronism with the rotation of the rotary kiln, thereby promoting relative sliding, increasing the coke cleaning effect and reducing the possibility of jamming.

[0038] The positive and progressive effect of the present invention is that the coke cleaning device is placed as a whole in the rotary kiln, so that the coke cleaning device rotates with the rotary kiln under the influence of gravity, and the coke-like material attached to the inner wall of the rotary kiln is scraped off by the relative sliding of the coke cleaning part and the inner wall of the rotary kiln, thereby achieving coke cleaning. The device has no external structure of the rotary kiln, and there is no need to consider the damage of the motor drive parts or connecting rods and other mechanisms under high temperature conditions, and there is no need to open the wall of the rotary kiln, so that online coke cleaning can be achieved without affecting the sealing of the rotary kiln. The coke cleaning device drives the coke cleaning by its own weight, and the device itself has no power demand. The coke cleaning part is always in contact with the inner wall of the rotary kiln, so that the coke cleaning part can still maintain sliding contact with the inner wall of the rotary kiln when it is worn, which can extend the effective coke cleaning time, improve the stability of the device operation, and is environmentally friendly and easy to maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a schematic diagram of the overall structure of the coke cleaning device provided by the present invention.

[0040] Figure 2 A schematic diagram of the structure of the defocusing device provided by the present invention from a side view angle.

[0041] Figure 3 The present invention is a schematic diagram of a coke cleaning device provided by the present invention when it is arranged in a rotary kiln from a front view angle.

[0042] Figure 4 This is a schematic diagram of the working status of the decoking device provided by the present invention under different working conditions.

[0043] Description of reference numerals:

[0044] Device body 10

[0045] Connection 1

[0046] Radial connector 2

[0047] Axial connector 3

[0048] Counterweight 4

[0049] De-coking department 5

[0050] Rotary kiln 6

[0051] Stopper 7

[0052] Support structure 8 DETAILED DESCRIPTION

[0053] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples.

[0054] like Figure 1-Figure 4 As shown, this embodiment provides a coke cleaning device for a rotary kiln 6, which is used for cleaning the rotary kiln 6. The coke cleaning device is arranged in the rotary kiln 6 along the axial direction of the rotary kiln 6. The coke cleaning device includes a device body 10. The device body 10 is provided with a coke cleaning portion 5. The coke cleaning portion 5 is arranged on one side of the device body 10 close to the inner wall of the rotary kiln 6 along the circumferential direction of the rotary kiln 6, so that when the device body 10 is affected by gravity and freely rotates and rolls with the rotary kiln 6, the coke cleaning portion 5 abuts against the inner wall of the rotary kiln 6 and slides relative to the inner wall of the rotary kiln 6 due to the influence of gravity on the device body 10.

[0055] In this embodiment, the coke cleaning device is placed in the rotary kiln 6 as a whole, so that the coke cleaning device rotates with the rotary kiln 6 under the influence of gravity, and the coke-like material attached to the inner wall of the rotary kiln 6 is scraped off by the relative sliding of the coke cleaning part 5 and the inner wall of the rotary kiln 6. The device has no external kiln structure, and there is no need to consider the damage of the motor drive parts or connecting rods and other mechanisms under high temperature conditions, and there is no need to open the wall of the rotary kiln 6, so that online coke cleaning is achieved without affecting the sealing of the rotary kiln 6. The coke cleaning device drives the coke cleaning by its own weight, and the device itself has no power demand. The coke cleaning part 5 always abuts against the inner wall of the rotary kiln, so that the coke cleaning part 5 still maintains sliding contact with the inner wall of the rotary kiln 6 when it is worn, which can extend the effective coke cleaning time, improve the stability of the device operation, and is environmentally friendly and easy to maintain.

[0056] In this embodiment, the decoking device is a hexagonal cage-like structure and includes an axial connector 3 and a radial connector 2. In other embodiments, the shape of the decoking device can be designed as needed, including polygonal, elliptical, circular, prismatic and other shapes, all of which can rotate with the rotary kiln 6 and perform the decoking function.

[0057] As an embodiment of the coke clearing device, during the implementation process, the coke clearing device may include a plurality of device bodies 10, and the plurality of device bodies 10 are sequentially arranged along the axial direction of the rotary kiln 6. Those skilled in the art may adjust the effective length range of coke clearing by arranging a plurality of device bodies 10 as required inside the rotary kiln; the plurality of device bodies 10 are all arranged inside the rotary kiln 6, and while maintaining unpowered online coke clearing, there is no need to open the inner wall of the rotary kiln 6, and the full length coke clearing of the rotary kiln 6 is achieved while ensuring the sealing performance, and the coke clearing requirements of the rotary kiln 6 of different length specifications are met by adjusting the number of device bodies 10.

[0058] like Figure 3 and Figure 4 As shown, the size of the coke cleaning device in the radial direction of the rotary kiln 6 is smaller than the inner diameter of the rotary kiln 6. By making the size of the coke cleaning device smaller than the inner diameter of the rotary kiln 6, a margin is reserved for the coke cleaning device to jump. When the coke cleaning part 5 cannot scrape off the tar smoothly, the coke cleaning device can rotate with the rotary kiln 6 and continue to roll over the tar part, so as to prevent the coke cleaning device from getting stuck and losing the coke cleaning effect, and reduce the frequency of maintenance required by personnel.

[0059] like Figure 1 and Figure 2 As shown, the coke cleaning device is parallel to the rotary kiln 6 along the axial direction of the rotary kiln 6 and eccentrically arranged in the rotary kiln 6. By making the coke cleaning device parallel to the rotary kiln 6 along the axial direction of the rotary kiln 6 and eccentrically arranged in the rotary kiln 6, a margin is reserved for the coke cleaning device to jump. Due to the size difference between the rotary kiln 6 and the coke cleaning device and the eccentric arrangement, the rotation frequency and linear speed of the coke cleaning device and the rotary kiln 6 are different, which promotes the relative sliding of the coke cleaning part 5 of the coke cleaning device and the inner wall of the rotary kiln 6, thereby increasing the coke cleaning effect.

[0060] In other embodiments, the radial dimension of the decoking device can be designed to be the same as the inner diameter of the rotary kiln 6 as needed. Since the decoking device and the inner wall of the rotary kiln 6 are not fixedly connected, decoking can also be performed by relative sliding caused by gravity.

[0061] like Figure 1 and Figure 4 As shown, the device body 10 is further provided with an axial connector 3 extending along the axial direction of the rotary kiln 6. In this embodiment, as an implementation method of a position-limiting fitting portion, the axial connector 3 is a position-limiting fitting portion, and the axial connector 3 is distributed on the outer side of the device body 10 along the circumferential direction of the rotary kiln 6; the inner wall of the rotary kiln 6 is provided with a protrusion protruding toward the center of the rotary kiln 6, forming a limiter 7; the limiter 7 extends along the axial direction of the rotary kiln 6, and the length of the limiter 7 along the radial direction of the rotary kiln 6 is less than the difference between the inner diameter of the rotary kiln 6 and the size of the coke cleaning device;

[0062] The process of the device body 10 rotating with the rotary kiln 6 includes a first working condition and a second working condition, wherein: in the first working condition, the axial connection member 3 is separated from the stopper 7, and the device body 10 can rotate naturally with the rotary kiln 6 and clear the coke by relative sliding;

[0063] When the axial connection member 3 contacts the stopper 7 during the rotation of the device body 10 in the first working condition, the device enters the second working condition;

[0064] In the second working condition, the stopper 7 abuts against the axial connection member 3, so that the rotation of the device body 10 is blocked and the device body 10 rotates synchronously with the rotary kiln 6 under the influence of the stopper 7;

[0065] In the second working condition, the device body 10 is lifted to a certain height by the limiter 7, the relative positions of the axial connection member 3 and the limiter 7 change, the device body 10 breaks away from the limit and falls to the rotary kiln 6, and can continue to rotate and return to the first working condition.

[0066] As an implementation method, a limiter 7 is provided on the cylinder wall of the rotary kiln 6, and the limiter 7 is periodically brought into contact with the axial connector 3 to lift the decoking device, and then the decoking device is naturally dropped. During the dropping process, the gravitational potential energy is converted into mechanical energy, thereby impacting the coke deposits on the cylinder wall, increasing the decoking strength, and preventing the situation in which, under high tar conditions, the normal load provided by the decoking device's own weight is insufficient to remove the high-viscosity coke deposits from the cylinder wall, thereby failing to effectively decoke.

[0067] Among them, in the first working condition, the coke cleaning device maintains a rotating posture before contacting the limiter 7, and the axial connecting member 3 slides relatively with the inner wall of the cylinder. As the rotary kiln 6 rotates, the coke cleaning device contacts the limiter 7, that is, the axial connecting member 3 abuts against the limiter 7, and enters the second working condition. The coke cleaning device is affected by the limiter 7 and rotates synchronously with the rotary kiln 6. When the coke cleaning device is lifted to a certain height by the limiter 7, the vertical component force provided by the limiter 7 is not enough to overcome the gravity on the coke cleaning device. The coke cleaning device then slides down, falls and impacts the coke-like material on the cylinder wall of the rotary kiln 6, and continues to rotate to clean coke, returning to the first working condition;

[0068] The radial length of the stopper 7 is smaller than the difference between the inner diameter of the rotary kiln 6 and the size of the coke cleaning device, so as to prevent the coke cleaning device from getting stuck with the stopper 7 and always rotating synchronously with the rotary kiln 6, thus preventing the coke cleaning device from being unable to clean coke.

[0069] As a preferred embodiment of the limiter 7, the thickness of the limiter 7 along the radial direction of the rotary kiln 6 is greater than the thickness of the axial connecting member 3 along the radial direction of the rotary kiln 6, so that the limiter 7 provides sufficient normal force through abutment to achieve a supporting and limiting effect for a period of time.

[0070] The stopper 7 in this embodiment is a plate-like structure protruding inward from the inner wall of the rotary kiln 6, and the plate-like structure extends along the axial direction of the rotary kiln 6. In other embodiments, those skilled in the art can design the shape and distribution of the stopper 7 as needed according to the shape of the coke cleaning device, including multiple stopper plates or stopper blocks distributed at intervals, etc. The axial extension of the stopper 7 is not limited to a whole line, and can also be a block or plate shape distributed at intervals. The distribution of the stopper 7 in the circumferential direction should not be too many. If too many, it will cause the coke cleaning device to frequently limit and stop the coke cleaning. Those skilled in the art can design the number of stoppers 7 according to the actual working conditions. In this embodiment, as an embodiment of a limit fitting part, the axial connector 3 is a limit fitting part. In other embodiments, other forms of limit fitting parts can be designed as needed, such as providing a protruding part, a baffle and other components on the outer contour of the device body 10, and the limit can also be achieved by the contact between the limit fitting part and the stopper.

[0071] like Figure 4 As shown, there are five pictures along the direction of travel of the arrow, showing from a frontal perspective the process in which the decoking device in this embodiment rotates with the rotary kiln 6 and switches between the first operating condition and the second operating condition mentioned above, wherein the limiter 7 rotates counterclockwise with the rotary kiln 6.

[0072] As mentioned above, the limiting fitting portion in this embodiment is the axial connecting member 3 .

[0073] Among them, the first figure shows the normal rotational decoking of the decoking device under the first working condition. In the second figure, the decoking device rotates and slides until the axial connecting member 3 and the limiter 7 abut against each other, entering the second working condition from the first working condition.

[0074] The second and third figures both illustrate the second working condition, in which the stopper 7 abuts against and clamps the coke cleaning device, causing the coke cleaning device to rotate counterclockwise and lift upward synchronously with the rotary kiln 6. As shown in the fourth figure, as the positions of the axial connector 3 and the stopper 7 change, the vertical support force provided by the stopper 7 is insufficient to resist the gravity of the coke cleaning device, the axial connector 3 separates from the stopper 7, and the coke cleaning device falls, entering the first working condition from the second working condition. The fifth figure illustrates that the coke cleaning device returns to the first working condition and continues to rotate to clean coke.

[0075] Figure 4 Only one stopper 7 is schematically illustrated in the figure. In other embodiments, those skilled in the art can design the number of stoppers as required.

[0076] like Figure 1-Figure 4As shown, the radial connectors 2 are arranged at the two ends of the device body 10 along the axial direction of the rotary kiln 6, and the two ends of the axial connector 3 are respectively fixedly connected to the radial connectors 2 at the two ends of the device body 10; the axial connector 3 and the radial connector 2 form the outer contour of the device body 10, and the decoking part 5 is arranged on the side of the axial connector 3 close to the inner wall of the rotary kiln 6; wherein, a plurality of axial frames are distributed on the periphery of the device body 10 along the circumferential direction of the rotary kiln 6, and the plurality of axial frames are arranged in parallel and at intervals; the two ends of the axial frames are respectively connected to the radial frames at the two ends of the device body 10 to form the side wall contour of the device body 10.

[0077] A supporting structure 8 is further provided between adjacent radial connectors 2 to provide supporting force and further increase the structural strength and stability of the device body 10 .

[0078] By providing an axial connector 3 extending along the axial direction of the rotary kiln 6 and a radial connector 2 extending along the radial direction of the rotary kiln 6, a cage-shaped frame of the outer contour of the device body 10 is formed. The radial connector 2 and the axial connector 3 are arranged and supported each other to ensure the structural strength of the coke cleaning device. The frame structure with gaps allows the device body 10 to rotate with the rotary kiln 6 while reducing the volume of the coke cleaning device occupying the material storage space inside the rotary kiln 6. Among them, each axial connector 3 is provided with a coke cleaning part 5 on one side close to the inner wall of the rotary kiln 6, so that the coke cleaning part 5 abuts against the inner wall of the rotary kiln 6 when the device body 10 rotates circumferentially with the rotary kiln 6 and scrapes off the coke on the inner wall.

[0079] As an embodiment of the device body 10, the device body 10 is further provided with a connecting portion 1, which is provided at the center of the end faces at both ends of the device body 10 in the axial direction. The connecting portion 1 is plate-shaped, and with the connecting portion 1 as the center, along the radial direction of the rotary kiln 6, one end of a plurality of radial connecting members 2 is fixedly connected to the connecting portion 1, and the other end extends from the connecting portion 1 to the inner wall of the rotary kiln 6, and is evenly distributed along the circumferential direction of the rotary kiln 6. By providing the plate-shaped connecting portion 1 at the center of the end faces at both ends of the device body 10 in the circumferential direction, the radial connecting members 2 can be connected to each other through the connecting portion 1 and form the end face frames at both ends of the device body 10, thereby increasing the structural strength and durability of the coke cleaning device.

[0080] Among them, as a preferred arrangement of radial connectors 2 and axial connectors 3, the number of radial connectors 2 at one end of the device body 10 is 4-10, and the number of axial connectors 3 is the same as the number of radial connectors 2 at one end. In this embodiment, the number of radial connectors 2 at one end of the device body 10 is 6, and the number of axial connectors 3 is 6, forming a hexagonal cage frame of the coke cleaning device. In other embodiments, those skilled in the art can also design the number of connectors as needed to form other polygonal cage frame shapes including pentagons, octagons, etc.

[0081] Among them, the radius of the connecting part 1 is greater than the distance that the center of the connecting part 1 deviates from the central axis of the rotary kiln 6; when the device body 10 moves along the axial direction of the rotary kiln 6, the connecting parts 1 of adjacent device bodies 10 abut against each other, so that the movement of the device body 10 in the axial direction of the rotary kiln 6 is limited.

[0082] As a preferred embodiment of the connection part 1, by setting a plate-shaped connection part 1 at the center of the end surface of both ends of the device body 10 in the circumferential direction, it is also possible to arrange multiple device bodies 10 in the axial direction in the rotary kiln 6. When the device body 10 moves axially, the connection parts 1 of adjacent device bodies 10 abut against each other, thereby preventing further collision between the device bodies 10 and preventing the frames between the device bodies 10 from interfering with each other, thereby affecting the decoking or getting stuck. Among them, the radius of the connection part 1 is greater than the distance that the center of the connection part 1 deviates from the central axis of the rotary kiln 6, so that even if the device body 10 bounces due to the eccentric setting, the connection parts 1 can still play the axial abutment and limiting role normally, thereby preventing interference between the device bodies 10.

[0083] like Figure 1-Figure 4 As shown, the coke cleaning part 5 is a scraper, and the scraper is made of wear-resistant material, and the hardness of the wear-resistant material is less than the hardness of the inner wall of the rotary kiln 6. As an implementation of the coke cleaning part 5, the scraper is used as the coke cleaning part 5 to scrape off the coke-like materials on the inner wall of the rotary kiln 6 to clean the coke. The material of the scraper is a wear-resistant material, which improves the durability and coke cleaning effect of the coke cleaning device; the hardness of the wear-resistant material in the coke cleaning working state is less than the hardness of the inner wall of the rotary kiln 6, which prevents the scraper from scratching the inner wall of the rotary kiln 6.

[0084] The decoking part 5 in this embodiment is a scraper extending along the axial direction. In other implementations, the shape and arrangement of the decoking part 5 can be designed by technicians in this field as needed, and other decoking structures such as scrapers and brushes can be used according to actual conditions.

[0085] like Figure 3 As shown, the device body 10 is provided with a counterweight 4 , and the counterweight 4 is arranged on a side of the device body 10 away from the inner wall of the rotary kiln 6 .

[0086] As an implementation mode of the counterweight 4, at least one counterweight 4 is provided on the radial connecting member 2. By setting the local counterweight, the overall center of gravity of the coke cleaning device is deviated from the axis of the rotary kiln 6, so as to avoid the coke cleaning device and the rotary kiln 6 rotating in the same cycle for a long time and causing relative movement failure and jamming during the relative movement between the material in the rotary kiln 6 and the coke cleaning device. By the asymmetric setting of the counterweight 4, the influence of gravity on the coke cleaning device during rotation and the asynchronism with the rotation of the rotary kiln 6 are increased, thereby promoting the occurrence of relative sliding, increasing the coke cleaning effect and reducing the possibility of jamming.

[0087] In other embodiments, those skilled in the art may set a plurality of counterweights 4 as required, and may adjust the arrangement and distribution of the counterweights 4 as required, for example, setting them on one of the axial connectors 3 and the radial connector 2 at the same time to improve the effect of local counterweighting. The counterweights 4 may be set asymmetrically relative to the center of the device body 10 to achieve the effect of deviating from the center of gravity of the device.

[0088] In summary, the decoking device provided in this embodiment has at least the following improvements over the prior art:

[0089] (1) The coke cleaning device is placed in its entirety in the rotary kiln 6, without destroying the inner wall of the rotary kiln 6 to form an opening, and does not create additional sealing requirements.

[0090] (2) The coke cleaning device rotates with the rotary kiln 6, and uses its own weight to drive the coke cleaning part 5 to rub against the kiln wall of the rotary kiln 6 to clean the coke. No driving device is required, so the coke cleaning device has no structure outside the rotary kiln 6, and there is no need to consider the damage of the motor drive parts or connecting rods and other mechanisms under high temperature conditions. It has good stability, is environmentally friendly and easy to maintain.

[0091] (3) The size of the decoking device is smaller than the inner diameter of the rotary kiln 6, thereby reserving a margin for the rotating decoking device to bounce, thereby preventing the decoking device from getting stuck when it cannot effectively decoke.

[0092] (4) The stopper 7 is provided to increase the strength of the self-weight coke cleaning under high temperature conditions and reduce the occurrence of jamming. Among them, as a result of placing the coke cleaning device in the rotary kiln 6, the improvements (1) to (3) work together, and the fully enclosed working environment also prevents the materials and the components of the coke cleaning device from escaping from the rotary kiln 6, further increasing the stability.

[0093] Improvement point (3) is combined with improvement point (4). On the one hand, due to the self-weight drive, the coke cleaning part 5 of the coke cleaning device always abuts against the inner wall of the rotary kiln 6 even if it is worn, thereby extending the effective coke cleaning time. On the other hand, combined with its self-weight driven characteristics, through the reserved bounce margin, the coke cleaning device is allowed to rise a certain distance with the limiter 7 and then slide down, thereby cooperating with the limiter 7 to guide the self-weight of the coke cleaning device and increase the coke cleaning effect through the impact of falling, thereby reducing the occurrence of the coke cleaning device getting stuck under high tar conditions.

[0094] In the description of the present invention, it is necessary to understand that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. indicate the orientation or positional relationship of the device or element in normal use, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation at any time, and therefore cannot be understood as a limitation of the present invention in this regard.

[0095] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that this is only for illustration and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A rotary kiln coke cleaning device, used for cleaning a rotary kiln, characterized in that: The coke cleaning device is arranged in the rotary kiln along the axial direction of the rotary kiln, and comprises a device body. The device body is provided with a coke cleaning portion, and the coke cleaning portion is arranged on one side of the device body close to the inner wall of the rotary kiln along the circumferential direction of the rotary kiln, so that when the device body is affected by gravity and freely rotates and rolls with the rotary kiln, the coke cleaning portion abuts against the inner wall of the rotary kiln and slides relative to the inner wall of the rotary kiln due to the influence of gravity on the device body.

2. The decoking device according to claim 1, characterized in that: The dimension of the decoking device along the radial direction of the rotary kiln is smaller than the inner diameter of the rotary kiln.

3. The decoking device according to claim 2, characterized in that: The decoking device is parallel to the rotary kiln along the axial direction of the rotary kiln and eccentrically arranged in the rotary kiln.

4. The decoking device according to claim 2, characterized in that: The device body is also provided with a limit matching portion, and the limit matching portion is circumferentially distributed on the outer side of the device body; The inner wall of the rotary kiln is provided with a protrusion protruding toward the center of the rotary kiln to form a stopper; the stopper extends along the axial direction of the rotary kiln. Preferably, the length of the stopper along the radial direction of the rotary kiln is smaller than the difference between the inner diameter of the rotary kiln and the size of the coke cleaning device; The process in which the device body rotates with the rotary kiln includes a first working condition and a second working condition. In the first working condition, the position-limiting matching part is separated from the position-limiting device, and the device body can rotate naturally with the rotary kiln and clear the coke by relative sliding; When the first working condition is met, the limiting matching portion contacts the limiter during the rotation of the device body, and the second working condition is entered; In the second working condition, the stopper abuts against the stopper matching portion, so that the rotation of the device body is blocked and the device body is affected by the stopper to rotate synchronously with the rotary kiln; When in the second working condition, the device body is lifted to a certain height by the limiter, the relative positions of the limit fitting part and the limiter change, the device body breaks away from the limit and falls to the rotary kiln, and can continue to rotate and return to the first working condition.

5. The decoking device according to claim 1, characterized in that: The device body is further provided with an axial connecting piece extending along the axial direction of the rotary kiln and a radial connecting piece extending along the radial direction of the rotary kiln, the radial connecting piece is provided at both ends of the device body along the axial direction of the rotary kiln, and the two ends of the axial connecting piece are respectively fixedly connected to the radial connecting pieces at both ends of the device body; the axial connecting piece and the radial connecting piece form the outer contour of the device body, and the coke cleaning part is provided on one side of the axial connecting piece close to the inner wall of the rotary kiln; Preferably, the device body is provided with a connecting part, and the connecting part is arranged at the center of the end surface of the two ends of the device body along the axial direction. The connecting part is plate-shaped, and with the connecting part as the center, along the radial direction of the rotary kiln, one end of a plurality of radial connecting members is fixedly connected to the connecting part, and the other end extends from the connecting part to the inner wall of the rotary kiln, and is evenly distributed along the circumferential direction of the rotary kiln.

6. The decoking device according to claim 1, characterized in that: The decoking device comprises a plurality of device bodies, and the plurality of device bodies are arranged in sequence along the axial direction of the rotary kiln.

7. The decoking device according to claim 6, characterized in that The device body is provided with a connecting part, which is arranged at the center of the end surface of both ends of the device body along the axial direction, the connecting part is plate-shaped, and the radius of the connecting part is greater than the distance that the center of the connecting part deviates from the central axis of the rotary kiln; When the device body moves along the axial direction of the rotary kiln, the connecting parts of adjacent device bodies abut against each other, so that the movement of the device body along the axial direction of the rotary kiln is restricted.

8. The decoking device according to claim 7, characterized in that The device body includes radial connecting members, with the connecting portion as the center, along the radial direction of the rotary kiln, one end of a plurality of radial connecting members is fixedly connected to the connecting portion, and the other end extends from the connecting portion to the inner wall of the rotary kiln and is evenly distributed along the circumferential direction of the rotary kiln.

9. The decoking device according to claim 1, characterized in that: The coke cleaning part is a scraper, and the scraper is made of wear-resistant material. The hardness of the wear-resistant material is less than the hardness of the inner wall of the rotary kiln.

10. A decoking device according to any one of claims 1 to 9, characterized in that: The device body is provided with at least one counterweight, which is arranged on one side of the device body away from the inner wall of the rotary kiln, and when a plurality of the counterweights are provided, the counterweights are arranged asymmetrically relative to the center of the device body.

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