Coke cleaning device

Abstract

The invention discloses a decoking device which is used for decoking a rotary kiln, the decoking device comprises a device body, a decoking part and a supporting part, and the length of the decoking device in the radial direction of the rotary kiln is smaller than the diameter of the rotary kiln; in the axial direction of the rotary kiln, the decoking part (which is arranged on the first part and is heavier) and the supporting part (which is arranged on the second part and is lighter) are respectively arranged on two sides of the device body; when the first part of the device body is arranged downwards, the decoking part can slide relative to the inner wall of the rotary kiln along with free rotation of the rotary kiln; when the second part of the device body is arranged downwards, the supporting part can abut against the inner wall of the rotary kiln so that the decoking device can turn over along with free rotation of the rotary kiln, and the first part of the device body is arranged downwards. A large-stroke free falling body process is converted into an overturning process with a fulcrum, and instantaneous vertical impact force caused by impact is converted into tangential shear force, so that the possibility of damage to the decoking device is reduced.

Description

Technical Field

[0001] The invention relates to the field of thermal equipment, and in particular to a coke cleaning device. Background Art

[0002] In industrial production, rotary kilns are an important type of thermal equipment and are widely used in many fields such as building materials, metallurgy, and chemical industry, such as the production of cement clinker, the burning of lime, and the pyrolysis process of organic waste. The interior of a rotary kiln is usually in a high-temperature, high-load, and highly corrosive working environment, and some processes produce high-viscosity by-products such as tar. After a rotary kiln rotates for a long time, coke is easily formed on its inner wall and the surface of the refractory material. 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 the refractory material, and even deformation of the kiln body.

[0003] In the prior art, there are two types of solutions for removing coke (i.e., decoking):

[0004] First, a powered mechanical structure is installed in the kiln to scrape off the coked materials in the kiln, but such a mechanical structure is usually more complicated and cannot guarantee good operation under high temperature conditions.

[0005] Second, a non-powered coke cleaning device is installed in the kiln. The coke in the kiln can be scraped off by the relative sliding of the coke cleaning device and the rotary kiln when the rotary kiln rotates, and the operation of the coke cleaning device is not affected by temperature. The usual structural setting is: on the cross section perpendicular to the rotary kiln's rotation axis, the cross section of the coke cleaning device is smaller than that of the rotary kiln, and the cross section is a regular polygon, that is, the center of gravity of the coke cleaning device is located at the center of the geometric structure; a scraper is arranged around the coke cleaning device in the same direction as the rotary kiln's rotation axis. When the rotary kiln rotates, the existence of gravity causes the downward scraper of the coke cleaning device and the inner wall of the rotary kiln to slide relative to each other, achieving a coke cleaning effect.

[0006] The current unpowered coke cleaning devices generally have the following problems:

[0007] When the coke cleaning device encounters obstacles such as the bed material on the inner wall of the rotary kiln, the bed material will intercept the scraper of the coke cleaning device and drive the coke cleaning device and the rotary kiln to rotate together until the intercepted scraper rotates to the middle and upper part of the rotary kiln and disengages from the limiter. Then, due to the influence of gravity, it falls directly to the bottom of the rotary kiln in a large-stroke free fall mode, causing a falling impact.

[0008] Such impact can easily cause damage to the downward scraper structure of the coke cleaning device, resulting in mechanical deformation of the coke cleaning device after running for a period of time, and insufficient durability. Summary of the invention

[0009] The technical problem to be solved by the present invention is to provide a coke cleaning device in order to overcome the defect that the unpowered coke cleaning device in the prior art is easily damaged during continuous use.

[0010] The present invention solves the above technical problems through the following technical solutions:

[0011] A coke cleaning device for cleaning a rotary kiln, the coke cleaning device comprising a device body and a coke cleaning portion, the length of the coke cleaning device in the radial direction of the rotary kiln being smaller than the diameter of the rotary kiln, and the coke cleaning device further comprising a supporting portion;

[0012] In the axial direction of the rotary kiln, the coke cleaning part and the support part are respectively arranged on both sides of the device body, and the side of the device body used for arranging the coke cleaning part is defined as the first part, and the side used for arranging the support part is defined as the second part, and the weight of the first part of the device body is greater than the weight of the second part;

[0013] When the first part of the device body is arranged downward, the coke cleaning part can slide relative to the inner wall of the rotary kiln as the rotary kiln rotates freely;

[0014] When the second part of the device body is arranged downward, the support part can abut against the inner wall of the rotary kiln, and the coke cleaning part slides downward under the influence of gravity, so that the first part of the device body is arranged downward.

[0015] In the technical solution, the coke clearing device is arranged in the rotary kiln along the axial direction of the rotary kiln. Since the length of the coke clearing device along the radial direction of the rotary kiln is less than the diameter of the rotary kiln, the coke clearing device can undergo a free fall separation process, specifically as follows: when the first part of the device body is set downward, the coke clearing part generates a sliding stroke relative to the inner wall of the rotary kiln to achieve coke clearing, and since the weight of the first part of the device body is greater than the weight of the second part, the first part with the coke clearing part is kept downward under the action of gravity to achieve continuous coke clearing. When the second part of the device body is set downward under the action of external factors, the support part abuts against the inner wall of the rotary kiln, and the rotary kiln drives the coke clearing device to rotate together, so that the relatively heavy first part is located at a relatively high position, and the coke clearing part slides downward under the influence of gravity, so that the device body returns to the state where the first part is set downward. In this way, when the second part of the device body is set downward under the action of external factors, the support part can abut against the inner wall of the rotary kiln. Since the coke cleaning device is subjected to gravity and the force in the direction of rotation exerted by the inner wall of the rotary kiln, the two work together, so that the coke cleaning device moves in the downward sliding stroke of the coke cleaning part in a flipping motion with the support part as the fulcrum, which reduces the possibility of damage to the coke cleaning part of the first part; since the second part does not need to be provided with a redundant coke cleaning part, the total weight of the coke cleaning device is reduced, so that the center of gravity can be closer to the first part. On the one hand, the free fall process of the coke cleaning device with a large stroke is converted into a flipping process with a fulcrum, and the instantaneous vertical impact force caused by the impact is converted into a tangential shear force in the effective coke cleaning stroke of the sliding process, which further reduces the possibility of damage to the coke cleaning device. On the other hand, by increasing the center of gravity offset, the first part with the coke cleaning part can be kept facing downward continuously. By setting the increased center of gravity offset, the Y-axis stroke of the center of gravity of the coke cleaning device in the downward sliding stroke of the coke cleaning part increases, and the storage amount of the gravitational potential energy of the coke cleaning device at the high point is increased, thereby increasing the maximum effective coke cleaning force of the coke cleaning device in the downward sliding stroke of the coke cleaning part.

[0016] Therefore, the above-mentioned effects jointly extend the operating time required for the coke cleaning device to undergo mechanical deformation, thereby improving the durability of the coke cleaning device.

[0017] Preferably, the inner wall of the rotary kiln is provided with a protrusion protruding toward the center of the rotary kiln to form a stopper, and the stopper extends in the radial direction of the rotary kiln;

[0018] The sum of the length of the coke cleaning device along the radial direction of the rotary kiln and the length of the stopper along the radial direction is smaller than the diameter of the rotary kiln;

[0019] The process in which the device body rotates with the rotary kiln includes a first working condition and a second working condition;

[0020] Under the first working condition, the coke cleaning part is not in contact with the stopper, and the coke cleaning part achieves coke cleaning by relatively sliding on the inner wall of the rotary kiln;

[0021] When the coke cleaning part is in the first working condition, it contacts the stopper during the sliding process relative to the inner wall of the rotary kiln, and enters the second working condition;

[0022] Under the second working condition, the coke cleaning part contacts the limiter, the sliding of the coke cleaning part is blocked, the coke cleaning part is lifted to a certain height by the limiter, so that the second part of the device body is set downward, and the coke cleaning part is separated from the limiter due to gravity, so that the supporting part falls and abuts against the inner wall of the rotary kiln.

[0023] In the present technical solution, when the coke cleaning device cannot pass through the limiter, it can be brought to a high position by the limiter through the coke cleaning part to enter the second working condition, realize the flipping process to disengage and cross the limiter, and continue to return to the first working condition to realize coke cleaning, thereby preventing the coke cleaning device from getting stuck in the rotary kiln.

[0024] Preferably, the device body is provided with a radially extending member extending in the radial direction of the rotary kiln, a first axially extending member extending in the axial direction of the rotary kiln, and a coke clearing connecting member extending perpendicularly to the axial direction of the rotary kiln;

[0025] The radially extending members are arranged at both ends of the device body along the axial direction of the rotary kiln;

[0026] The coke clearing connecting piece is arranged at both ends of the device body along the axial direction of the rotary kiln, and the middle part of the coke clearing connecting piece is connected to one side of the two radially extending pieces close to the first part;

[0027] The two ends of the first axial extension member are respectively fixedly connected to the coke clearing connection members at the two ends of the device body;

[0028] The first axially extending member and the coke cleaning connecting member form the outer contour of the device body, and the coke cleaning portion is arranged on a side of the first axially extending member close to the inner wall of the rotary kiln.

[0029] In the present technical solution, through the above-mentioned arrangement, the structure of the device body is relatively simple; and because the first axial extension member and the decoking connecting member are fixedly connected and connected to the radial extension member, a relatively stable frame structure is formed, which is easy to withstand the force transmitted from the decoking part to the first axial extension member, and further extends the operating time required for the decoking device to undergo mechanical deformation.

[0030] Preferably, the defocusing connecting members connected to both ends of the same two radially extending members are both connected to the ends of the radially extending members on one side close to the first portion; and / or,

[0031] The de-coking connecting members connected to both ends of the same two radially extending members are both connected to the middle portion of one side of the radially extending member close to the first portion.

[0032] In the present technical solution, through the above-mentioned arrangement, when a single connecting member is connected to the end or middle portion of the radial extension member on one side close to the first part, the structure of the device body is relatively simple and can be adapted to the decoking process with less coke; when multiple connecting members are connected to the end and middle portion of the radial extension member on one side close to the first part, it can be adapted to the decoking process with more coke; both can make the stress of the decoking device more symmetrically distributed, further extending the operating time required for the decoking device to undergo mechanical deformation.

[0033] Preferably, the device body further comprises a counterweight, and the counterweight is located at an end of the radially extending member on a side close to the first portion; and / or,

[0034] The number of the first axially extending members is 2-4; and / or,

[0035] The device body further comprises a first reinforcing member, two ends of which are respectively connected to the middle of the radially extending member and the middle of one side of the decoking connecting member; and / or,

[0036] The device body is arranged in an axisymmetric manner along the extending direction of the radially extending member.

[0037] In the present technical solution, by arranging a counterweight at the end of the radially extending member close to the first part, the weight ratio of the first part and the second part can be adjusted, thereby effectively ensuring that the coke cleaning part and the inner wall of the rotary kiln maintain a relative sliding state for a long time, thereby increasing the proportion of the effective coke cleaning sliding stroke.

[0038] By setting the number of the first axial extension members to 2-4, the structure of the device body can be made simpler and adapted to different coke clearing processes of the coke.

[0039] By providing the first reinforcement member, the force transmitted from the coke cleaning portion to the first axial extension member is more evenly transmitted to the coke cleaning connecting member and the radial extension member, further extending the operating time required for the mechanical deformation of the coke cleaning device.

[0040] By arranging the device body to be axially symmetrical along the extension direction of the radial extension member, the posture of the device body during the flipping process can be relatively stable, and sudden changes in posture can be avoided so that the parts other than the supporting part can be prevented from impacting the inner wall of the rotary kiln.

[0041] Preferably, the device body is further provided with a supporting connection member;

[0042] The supporting connecting members are arranged at both ends of the device body along the axial direction of the rotary kiln, and the middle parts of the supporting connecting members are connected to one side of the radially extending member close to the second part;

[0043] The supporting portion is arranged on one side of the supporting connecting member close to the inner wall of the rotary kiln.

[0044] In the present technical solution, the above-mentioned arrangement enables the flipping process to be further decomposed into at least two times: during the free fall process, the support portion on one side of the coke cleaning portion close to the inner wall of the rotary kiln bears the impact force of colliding with the inner wall of the rotary kiln; then, the support portion enters a state of abutting against the inner wall of the rotary kiln, so that the rotary kiln continues to drive the coke cleaning device to rotate together, until the support portion runs to the middle of the rotary kiln or another point below, since the weight of the first part is greater than the weight of the second part, the different gravity effects of the first part and the second part can make the coke cleaning device flip for the first time with the free rotation of the rotary kiln, until the support portion on the other side of the support connector impacts the inner wall of the rotary kiln; then, the support portion on the other side enters a state of abutting against the inner wall of the rotary kiln, so that the rotary kiln continues to drive the coke cleaning device to rotate together, until the support portion on the other side also runs to the middle of the rotary kiln or another point below, and then flips for the second time and returns to the state where the first part of the device body is set downward. This can further reduce the impact force on the coke cleaning portion of the first part of the device body when the flipping is completed, and further extend the operating time required for the coke cleaning device to undergo mechanical deformation.

[0045] Preferably, the number of the supporting connecting members is two, and the middle parts of the two supporting connecting members are connected to the end of the radially extending member on one side close to the second portion; and / or,

[0046] The device body is further provided with a second axial extension member extending along the axial direction of the rotary kiln, and two ends of the second axial extension member are respectively connected to the middle parts of the two supporting connecting members; and / or,

[0047] The device body also includes a second reinforcing member, and two ends of the second reinforcing member are respectively connected to the middle of one side of the radially extending member close to the second portion and the middle of one side of the supporting connecting member.

[0048] In the present technical solution, by arranging the middle parts of the two supporting connecting members to be connected to the end of the radially extending member on one side close to the second part, the structure of the device body can be made simpler and the supporting part can more stably withstand the impact at both ends of the device body.

[0049] By providing the second reinforcing member, the force transmitted from the supporting portion to the supporting connecting member is more evenly transmitted to the radially extending member, further extending the operating time required for the mechanical deformation of the coke cleaning device.

[0050] Preferably, the ends of all the coke clearing connectors and all the supporting connectors provided at the same end of the device body along the axial direction of the rotary kiln are located on the same circumferential side.

[0051] In the technical solution, the above arrangement makes the posture of the device body relatively stable during the turning process, avoiding sudden changes in posture that may cause the various structures of the device body to have additional impacts on the inner wall of the rotary kiln.

[0052] Preferably, the ratio of the length of the decoking device along the radial direction of the rotary kiln to the length of the rotary kiln in the radial direction is less than 97%.

[0053] In the technical solution, through the above-mentioned arrangement, sufficient anti-jamming margin is provided for the coke cleaning device, which is beneficial to the continuous operation of the coke cleaning device.

[0054] Preferably, the coke cleaning part is a scraper, and the scraper is made of a wear-resistant material, and the hardness of the wear-resistant material is less than the hardness of the inner wall of the rotary kiln; and / or,

[0055] The shape of the support portion is adapted to the inner wall of the rotary kiln; and / or,

[0056] A third reinforcing member is provided at a portion of the support portion that contacts the inner wall of the rotary kiln.

[0057] In this technical solution, the durability and coke cleaning effect of the coke cleaning device are improved by selecting the material of the scraper; the hardness of the wear-resistant material in the coke cleaning working state is lower than the hardness of the inner wall of the rotary kiln, preventing the scraper from scratching the inner wall of the rotary kiln.

[0058] By setting the shape of the support part to be adapted to the inner wall of the rotary kiln, the support part can stably abut against the inner wall of the rotary kiln after free fall and before and after flipping, thereby avoiding additional sliding stroke of the support part.

[0059] By providing a third reinforcing member at the portion of the support part in contact with the inner wall of the rotary kiln, the support part can be strengthened in a targeted manner, further improving the service life of the support part, and facilitating the continuous operation of the coke cleaning device.

[0060] The positive and progressive effects of the present invention are:

[0061] In the present technical solution, the coke cleaning device is arranged in the rotary kiln along the axial direction of the rotary kiln. Since the length of the coke cleaning device along the radial direction of the rotary kiln is smaller than the diameter of the rotary kiln, the coke cleaning device can undergo a free fall detachment process, specifically as follows: when the first part of the device body is arranged downward, the coke cleaning part generates a sliding stroke relative to the inner wall of the rotary kiln to achieve coke cleaning; after the sliding stroke of the coke cleaning part is blocked, the rotary kiln drives the coke cleaning device to rotate together until the coke cleaning part rotates to a certain point in the middle and upper part of the rotary kiln. Due to the action of gravity, the coke cleaning device detaches from the inner wall of the rotary kiln and detaches by free fall. At this time, the second part of the device body is arranged downward, and the supporting part can abut against the inner wall of the rotary kiln. Since the decoking device is subjected to gravity and the force applied by the inner wall of the rotary kiln in the direction of rotation, the two act together, so that the movement mode of the decoking device in the downward sliding stroke of the decoking part is a flipping motion with the support part as the fulcrum; then, the support part enters a state of abutting against the inner wall of the rotary kiln, so that the rotary kiln continues to drive the decoking device to rotate together, until the support part runs to the middle or another point below the rotary kiln, since the weight of the first part is greater than the weight of the second part, the different gravity effects of the first part and the second part can make the decoking device flip with the free rotation of the rotary kiln and return to the state where the first part of the device body is set downward. In this way, since the support part bears the impact force, the possibility of damage to the decoking part is reduced; since the second part does not need to set a redundant decoking part, the total weight of the decoking device is reduced, the free fall process of the decoking device with a large stroke is converted into a flipping process with a fulcrum, and the instantaneous vertical impact force caused by the impact is converted into a tangential shear force in the effective decoking stroke of the sliding process, which further reduces the possibility of damage to the decoking device. By increasing the center of gravity offset, the Y-axis travel of the center of gravity of the coke clearing device during the downward sliding stroke of the coke clearing part increases, which increases the storage of gravitational potential energy of the coke clearing device at the high point, thereby increasing the maximum effective coke clearing force of the coke clearing device during the downward sliding stroke of the coke clearing part. The above effects together extend the operating time required for the coke clearing device to undergo mechanical deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] Figure 1 It is a schematic diagram of the three-dimensional structure of the decoking device in Example 1.

[0063] Figure 2a Schematic diagram of the working state of the decoking device in Example 1 (I).

[0064] Figure 2b This is a schematic diagram of the working status of the decoking device in Example 1 (II).

[0065] Figure 2c Schematic diagram of the working status of the decoking device in Example 1 (III).

[0066] Figure 2dSchematic diagram of the working status of the decoking device in Example 1 (IV).

[0067] Figure 2e Schematic diagram of the working status of the decoking device in Example 1 (V).

[0068] Figure 2f Schematic diagram of the working status of the decoking device in Example 1 (VI).

[0069] Figure 3 This is a simulated stress analysis diagram of the coke cleaning device in Example 1.

[0070] Figure 4 It is a schematic diagram of the three-dimensional structure of the decoking device in Example 2.

[0071] Description of reference numerals:

[0072] Decoking device 1

[0073] Part 101

[0074] Part 2102

[0075] Device body 11

[0076] Radial extension 111

[0077] The first axial extension member 112

[0078] Coke cleaning connector 113

[0079] Counterweight 114

[0080] First reinforcement member 115

[0081] Support connector 116

[0082] Second axial extension 117

[0083] Second reinforcement member 118

[0084] The third reinforcement member 119

[0085] De-coking department 12

[0086] Supporting part 13

[0087] Rotary kiln 2

[0088] Stopper 21 DETAILED DESCRIPTION

[0089] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples.

[0090] Example 1

[0091] like Figure 1 As shown, this embodiment provides a coke cleaning device 1, which is used to clean the rotary kiln 2. The coke cleaning device 1 includes a device body 11, a coke cleaning part 12 and a support part 13. The length of the coke cleaning device 1 along the radial direction of the rotary kiln 2 is smaller than the diameter of the rotary kiln 2, so that the coke cleaning device 1 can undergo a free fall separation process. Figure 2a The coordinates in (the X-axis is perpendicular to the rotation axis of the rotary kiln 2 and points to the horizontal direction; the Y-axis is perpendicular to the rotation axis of the rotary kiln 2 and points to the vertical direction) can be regarded as a Y-axis stroke in the space coordinates.

[0092] In the axial direction of the rotary kiln 2, the decoking part 12 and the supporting part 13 are respectively arranged on both sides of the device body 11, and the side of the device body 11 used to set the decoking part 12 is defined as the first part 101, and the side used to set the supporting part 13 is defined as the second part 102, and the weight of the first part 101 of the device body 11 is greater than the weight of the second part 102.

[0093] When the first portion 101 of the device body 11 is disposed downward, the coke cleaning unit 12 can slide relative to the inner wall of the rotary kiln 2 as the rotary kiln 2 rotates freely, so that the first portion 101 of the device body 11 remains disposed downward under the action of gravity.

[0094] When the second part 102 of the device body 11 is set downward, the support part 13 can abut against the inner wall of the rotary kiln 2. At the same time, the second part 102 is relatively lighter than the first part 101, so the decoking part will slide downward under the influence of gravity, so that the device body 11 returns to the first part 101 facing downward.

[0095] In this embodiment, the inner wall of the rotary kiln 2 is provided with a protrusion protruding toward the center of the rotary kiln 2, forming a limiter 21. The limiter 21 extends in the radial direction of the rotary kiln 2. The existence of the limiter 21 will cause the sliding stroke of the coke cleaning part 12 to be blocked, but due to the structural setting and center of gravity distribution of the coke cleaning device 1, the coke cleaning device 1 can still restore the first part 101 to the downward state after the sliding is blocked.

[0096] Specific as Figure 2a-2f As shown, during the rotation of the rotary kiln 2, the position of the coke cleaning device 1 changes as follows:

[0097] S1, such as Figure 2a As shown, under normal operation, the rotary kiln 2 rotates continuously in the direction indicated by the arrow. Since the weight of the first part 101 of the device body 11 is greater than that of the second part 102, when the first part 101 is arranged downward, at least part of the four coke cleaning parts 12 are attached to the inner wall of the rotary kiln 2 and generate a sliding stroke relative to the inner wall of the rotary kiln 2 to achieve coke cleaning.

[0098] S2, such as Figure 2b As shown, the stopper 21 of the rotary kiln 2 contacts the coke cleaning part 12, so that the sliding stroke of the coke cleaning part 12 is blocked. Figure 2c As shown, the coke cleaning unit 12 is lifted to a certain height by the stopper 21, so that the second portion 102 of the device body 11 is arranged downward. Figure 2d As shown, the rotary kiln 2 drives the coke cleaning device 1 to rotate together, until the coke cleaning part 12 rotates to a certain point in the middle and upper part of the rotary kiln 2, and due to the action of gravity, the coke cleaning part 12 breaks away from the stopper 21, so that the support part 13 falls and abuts against the inner wall of the rotary kiln 2. At this time, the second part 102 of the device body 11 is set downward. Since the coke cleaning device 1 is subjected to gravity and the force applied by the inner wall of the rotary kiln 2 in the rotation direction, the two act together, so that the coke cleaning device 1 moves in the downward sliding stroke of the coke cleaning part 12 in a flipping motion with the support part 13 as the fulcrum;

[0099] S3, such as Figure 2e As shown in the figure, the support part 13 is in contact with the inner wall of the rotary kiln 2, so that the rotary kiln 2 continues to drive the coke cleaning device 1 to rotate together. Since the second part 102 facing downward is relatively light and the first part 101 facing upward is heavier, the weight difference will cause the coke cleaning part 12 to move along the rotary kiln 2 under the influence of gravity. Figure 2e Slide downward in the direction indicated by the dashed arrow. Figure 2f As shown, the coke cleaning portion 12 slides downward due to gravity, so that the device body 11 returns to the state where the first portion 101 is arranged downward.

[0100] In the above process, the free fall process of the coke clearing device 1 with a large stroke is converted into a flipping process with a fulcrum, and the instantaneous vertical impact force caused by the collision is converted into a tangential shear force in the effective coke clearing stroke of the sliding process, thereby avoiding the possibility of damage to the coke clearing part 12; since the second part 102 does not need to be provided with a redundant coke clearing part 12, the total weight of the coke clearing device 1 is reduced, and the center of gravity can be closer to the first part 101. On the one hand, the impact force of the free fall process is reduced, and the possibility of damage to the coke clearing part 12 of the coke clearing device 1 is further reduced. On the other hand, by increasing the center of gravity offset, the first part 101 with the coke clearing part 12 can continue to remain downward, thereby improving the coke clearing effect. By setting the increased center of gravity offset, the Y-axis stroke of the center of gravity of the coke clearing device 1 in the downward sliding stroke of the coke clearing part 12 increases, and the storage amount of the gravitational potential energy of the coke clearing device 1 at the high point is increased, thereby increasing the maximum effective coke clearing force of the coke clearing device 1 in the downward sliding stroke of the coke clearing part 12. Therefore, the above effects work together to improve the durability of the coke cleaning device 1 and extend the operating time required for the coke cleaning device 1 to undergo mechanical deformation.

[0101] Reference for stress distribution of coke cleaning device 1 Figure 3 .

[0102] That is to say, with respect to the protrusion (i.e., the stopper 21) on the inner wall of the rotary kiln 2, the process in which the device body 11 rotates with the rotary kiln 2 includes a first working condition and a second working condition. The device body 11 successively performs the first working condition and the second working condition to escape from the restriction of the stopper 21, so that the first portion 101 of the device body 11 is arranged downward:

[0103] In the first working condition, the coke cleaning part 12 is not in contact with the stopper 21, and the coke cleaning part 12 performs coke cleaning by relatively sliding on the inner wall of the rotary kiln 2;

[0104] In the first working condition, the coke cleaning part 12 contacts the stopper 21 during the sliding process relative to the inner wall of the rotary kiln 2, and enters the second working condition;

[0105] In the second working condition, the coke cleaning part 12 contacts the stopper 21, the sliding of the coke cleaning part 12 is blocked, and the coke cleaning device 1 turns over with the free rotation of the rotary kiln 2;

[0106] In the second working condition, the device body 11 is lifted to a certain height by the stopper 21, the coke cleaning part 12 is separated from the stopper 21, the support part 13 falls to the rotary kiln 2, and the device body 11 can continue to rotate and return to the first working condition.

[0107] The specific process of the first working condition and the second working condition refers to the aforementioned S1-S3. The above-mentioned arrangement enables the decoking device 1 to be brought to a high position by the limiter 21 through the decoking part 12 to enter the second working condition to realize the flipping process when it cannot pass through the limiter 21, so as to cross the limiter 21 and continue to return to the first working condition to realize decoking, thereby preventing the decoking device 1 from getting stuck in the rotary kiln 2.

[0108] In this embodiment, the device body 11 is provided with a radial extension member 111 extending in the radial direction of the rotary kiln 2 , a first axial extension member 112 extending in the axial direction of the rotary kiln 2 , and a coke clearing connection member 113 extending perpendicularly to the axial direction of the rotary kiln 2 .

[0109] The radially extending members 111 are disposed at both ends of the device body 11 along the axial direction of the rotary kiln 2 .

[0110] The decoking connecting pieces 113 are disposed at both ends of the device body 11 along the axial direction of the rotary kiln 2 , and the middle portions of the decoking connecting pieces 113 are connected to one side of the two radially extending pieces 111 close to the first portion 101 .

[0111] Both ends of the first axial extension member 112 are fixedly connected to the coke clearing connecting members 113 at both ends of the device body 11 .

[0112] The first axially extending member 112 and the coke cleaning connecting member 113 form the outer contour of the device body 11 , and the coke cleaning portion 12 is disposed on one side of the first axially extending member 112 close to the inner wall of the rotary kiln 2 .

[0113] The above arrangement makes the structure of the device body 11 relatively simple; and because the first axial extension piece 112 and the decoking connecting piece 113 are fixedly connected and connected to the radial extension piece 111, a relatively stable frame structure is formed, which is easy to withstand the force transmitted from the decoking part 12 to the first axial extension piece 112, and further extends the operating time required for the decoking device 1 to undergo mechanical deformation.

[0114] In this embodiment, when a single connecting member is connected to the end and the middle of the radially extending member 111 on one side close to the first portion 101, it can adapt to the decoking process with a large amount of coke.

[0115] In other embodiments, when a single connecting member is connected to the end or middle of the radial extension member 111 on one side close to the first portion 101, the structure of the device body 11 is relatively simple and can be adapted to the decoking process with less coke.

[0116] The above two arrangements can make the stress of the decoking device 1 distributed more symmetrically, further prolonging the operating time required for the decoking device 1 to undergo mechanical deformation.

[0117] In this embodiment, the device body 11 further includes a counterweight 114, which is located at an end of the radially extending member 111 on a side close to the first portion 101 (in this embodiment, as shown in FIG. Figure 1 As shown, the counterweight 114 is connected to the end of the radial extension member 111 through the decoking connector 113 located on the contour of the device body 11, but in other embodiments it can also be connected to other nearby structures, such as being directly set at the end of the radial connector, etc.), so as to adjust the weight ratio of the first part 101 and the second part 102, effectively ensure that the decoking part 12 and the inner wall of the rotary kiln 2 maintain a relative sliding state for a long time, and increase the proportion of effective decoking sliding stroke.

[0118] In this embodiment, the number of the first axial extension members 112 is 4, so that the structure of the device body 11 is relatively simple and suitable for the coke removal process with a large amount of coke. According to the difference in the amount of coke, in other embodiments, the number of the first axial extension members 112 can also be other values ​​within the range of 2-4.

[0119] In this embodiment, the device body 11 is axially symmetrically arranged along the extension direction of the radial extension member 111 so that the posture of the device body 11 is relatively stable during the flipping process to prevent the part other than the support part 13 from impacting the inner wall of the rotary kiln 2 due to a sudden change in posture.

[0120] In this embodiment, the device body 11 is further provided with a supporting connection member 116 .

[0121] The supporting connecting members 116 are arranged at both ends of the device body 11 along the axial direction of the rotary kiln 2, and the middle parts of the supporting connecting members 116 are connected to one side of the radially extending member 111 close to the second portion 102;

[0122] The support portion 13 is disposed on a side of the support connector 116 close to the inner wall of the rotary kiln 2 .

[0123] Please refer to FIG. 2 again. Through the above configuration, the flipping process can be further decomposed into at least two times:

[0124] S31, during the free fall process, the side support portion 13 of the coke cleaning portion 12 close to the inner wall of the rotary kiln 2 bears the impact force of colliding with the inner wall of the rotary kiln 2;

[0125] S32, then, the support portion 13 is brought into contact with the inner wall of the rotary kiln 2, so that the rotary kiln 2 continues to drive the coke cleaning device 1 to rotate together, until the support portion 13 runs to another point in the middle or below the rotary kiln 2, and since the weight of the first portion 101 is greater than the weight of the second portion 102, the different gravity effects of the first portion 101 and the second portion 102 can cause the coke cleaning device 1 to perform the first flipping with the free rotation of the rotary kiln 2, until the support portion 13 located on the other side of the support connector 116 impacts the inner wall of the rotary kiln 2;

[0126] S33. Then, the support part 13 on the other side is brought into contact with the inner wall of the rotary kiln 2, so that the rotary kiln 2 continues to drive the decoking device 1 to rotate together, until the support part 13 on the other side also runs to the middle of the rotary kiln 2 or another point below it, and then the second flip is performed to return to the state where the first part 101 of the device body 11 is set downward.

[0127] In this way, the impact force on the decoking portion 12 of the first part 101 of the device body 11 when the flipping is completed can be further reduced, and the operating time required for the decoking device 1 to undergo mechanical deformation can be further prolonged.

[0128] In this embodiment, there are two supporting connectors 116, and the middle parts of the two supporting connectors 116 are connected to the end of the radial extension member 111 on the side close to the second part 102, so that the structure of the device body 11 is relatively simple and the support part 13 can more stably withstand the impact at both ends of the device body 11.

[0129] In this embodiment, the device body 11 is further provided with a second axial extension member 117 extending along the axial direction of the rotary kiln 2, and the two ends of the second axial extension member 117 are respectively connected to the middle of the two supporting connecting members 116, thereby improving the stability of the end of the radial extension member 111 close to the second portion 102, and further extending the operating time required for the mechanical deformation of the coke cleaning device 1. And / or,

[0130] In the present embodiment, the ends of all the decoking connectors 113 and all the supporting connectors 116 provided at the same end of the device body 11 along the axial direction of the rotary kiln 2 are located on the same circumferential side, so that the posture of the device body 11 during the flipping process is relatively stable, and the sudden change in posture is avoided so that the various structures of the device body 11 do not generate additional impact on the inner wall of the rotary kiln 2.

[0131] In this embodiment, the ratio of the length of the decoking device 1 along the radial direction of the rotary kiln 2 to the length of the rotary kiln 2 in the radial direction is 95%, which provides a sufficient anti-jamming margin for the decoking device 1 and facilitates the continuous operation of the decoking device 1. In other embodiments, the above length ratio can also take other values ​​within a range less than 97%.

[0132] In this embodiment, the coke cleaning part 12 is a scraper, and the scraper is made of wear-resistant material to improve the durability and coke cleaning effect of the coke cleaning device 1; the hardness of the wear-resistant material is less than the hardness of the inner wall of the rotary kiln 2 to prevent the scraper from scratching the inner wall of the rotary kiln 2. Generally, the scraper wear life should be greater than 180 days, the hardness should be less than HBW150, and the normal pressure of the contact surface of the scraper relative to the inner wall of the rotary kiln during sliding should be greater than 0.3MPa.

[0133] Other material configurations and related parameters in this embodiment are as follows:

[0134] Considering that the device body 11 is made of stainless steel (Q235 steel is used in this embodiment), the scraper material is selected from materials with a yield strength of less than or equal to 150MPa, and QAl9-2 or QAl9-4 are initially selected. The wear volume of the metal material is measured by performing a wear test under the requirements of the standard "Metal Material Wear Test Method, Test Ring-Test Block Sliding Wear Test" (GB / T 12444-2006), and then the theoretical working life of the metal can be calculated according to the Archard wear theory. After testing, QAl9-4 was finally selected as the scraper material, and the theoretical working life under the target working conditions is 258 days.

[0135] The above materials are used to make the coke cleaning device of the prior art and the coke cleaning device 1 of the present embodiment with the same length and width, and are applied to a rotary kiln with a diameter of D=1.2m (refer to Figure 2a )、axial length L=1.5m (reference Figure 1) as an example, it is found that the coke cleaning device 1 of the prior art weighs 89.2 kg, and the coke cleaning device 1 of this embodiment weighs 71.9 kg, which is 80.6% of the coke cleaning device of the prior art, which significantly reduces the weight of the coke cleaning device 1 and further reduces the impact on the coke cleaning device 1.

[0136] Furthermore, the coke clearing device of the prior art has a maximum movement speed of 0.885 m / s before collision, and a maximum structural stress generated by the collision of 465 MPa, which exceeds the yield strength of Q235 angle steel of 235 MPa, indicating that mechanical deformation may occur in the structure of the coke clearing device of the prior art after running for a period of time.

[0137] Please refer to Figure 3 , the maximum collision speed of the coke cleaning device 1 of this embodiment in the motion simulation is 0.292m / s, and the maximum structural stress is less than 235Mpa. That is, compared with the maximum structural stress of the coke cleaning device in the prior art, the maximum structural stress of the coke cleaning device 1 of this embodiment is greatly reduced, and is less than the allowable stress of the supporting material, so it is difficult to cause mechanical deformation under normal working conditions. Usually, when other materials and sizes are used, the normal pressure of the contact surface generated by the collision between the coke cleaning device 1 and the rotary kiln 2 is not more than 30MPa, and the structural stress generated by the collision between the coke cleaning device 1 and the rotary kiln 2 is not more than 235MPa.

[0138] In this embodiment, the shape of the support portion 13 is adapted to the inner wall of the rotary kiln 2 so that the support portion 13 can stably abut against the inner wall of the rotary kiln 2 after free fall and before and after flipping, thereby avoiding additional sliding stroke of the support portion 13.

[0139] Example 2

[0140] like Figure 4 As shown, this embodiment provides a decoking device 1, and its structure is similar to the decoking device 1 in embodiment 1. The difference is that:

[0141] The device body 11 further includes a first reinforcing member 115, the two ends of which are respectively connected to the middle of the radially extending member 111 and the middle of one side of the defocusing connecting member 113.

[0142] By providing the first reinforcing member 115, the force transmitted from the coke cleaning portion 12 to the first axial extension member 112 is more evenly transmitted to the coke cleaning connecting member 113 and the radial extension member 111, further extending the operating time required for the mechanical deformation of the coke cleaning device 1.

[0143] Please refer to Figure 3Since the maximum stress of the decoking device 1 is concentrated at the portion where the supporting connector 116 is connected to the radial extension member 111, the device body 11 is provided to further include a second reinforcing member 118, the two ends of which are respectively connected to the middle of the radial extension member 111 on one side close to the second portion 102 and the middle of the support connector 116 on one side, so that the force transmitted from the support portion 13 to the support connector 116 is more evenly transmitted to the radial extension member 111, so as to strengthen the weak points of the structure in a targeted manner, thereby further extending the operating time required for the decoking device 1 to undergo mechanical deformation.

[0144] In this embodiment, a third reinforcement member 119 is provided at the portion of the support portion 13 of the decoking device 1 that contacts the inner wall of the rotary kiln 2 , so as to specifically strengthen the support portion 13 , further improve the service life of the support portion 13 , and facilitate the continuous operation of the decoking device 1 .

[0145] 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 coke cleaning device for cleaning a rotary kiln, the coke cleaning device comprising a device body and a coke cleaning part, the length of the coke cleaning device in the radial direction of the rotary kiln being smaller than the diameter of the rotary kiln, characterized in that: The decoking device further comprises a supporting portion; In the axial direction of the rotary kiln, the coke cleaning part and the support part are respectively arranged on both sides of the device body, and the side of the device body used for arranging the coke cleaning part is defined as the first part, and the side used for arranging the support part is defined as the second part, and the weight of the first part of the device body is greater than the weight of the second part; When the first part of the device body is arranged downward, the coke cleaning part can slide relative to the inner wall of the rotary kiln as the rotary kiln rotates freely, so that the first part of the device body is arranged downward; When the second part of the device body is arranged downward, the support part can abut against the inner wall of the rotary kiln, and the coke cleaning part slides downward under the influence of gravity, so that the first part of the device body is arranged downward.

2. The decoking device according to claim 1, characterized in that: The inner wall of the rotary kiln is provided with a protrusion protruding toward the center of the rotary kiln to form a stopper, and the stopper extends in the radial direction of the rotary kiln; The sum of the length of the coke cleaning device along the radial direction of the rotary kiln and the length of the stopper along the radial direction is smaller than the diameter of the rotary kiln; The process in which the device body rotates with the rotary kiln includes a first working condition and a second working condition; Under the first working condition, the coke cleaning part is not in contact with the stopper, and the coke cleaning part achieves coke cleaning by relatively sliding on the inner wall of the rotary kiln; When the coke cleaning part is in the first working condition, it contacts the stopper during the sliding process relative to the inner wall of the rotary kiln, and enters the second working condition; Under the second working condition, the coke cleaning part contacts the limiter, the sliding of the coke cleaning part is blocked, the coke cleaning part is lifted to a certain height by the limiter, so that the second part of the device body is set downward, and the coke cleaning part is separated from the limiter due to gravity, so that the supporting part falls and abuts against the inner wall of the rotary kiln.

3. The decoking device according to claim 1, characterized in that: The device body is provided with a radially extending member extending in the radial direction of the rotary kiln, a first axially extending member extending in the axial direction of the rotary kiln, and a coke clearing connecting member extending perpendicularly to the axial direction of the rotary kiln; The radially extending members are arranged at both ends of the device body along the axial direction of the rotary kiln; The coke clearing connecting piece is arranged at both ends of the device body along the axial direction of the rotary kiln, and the middle part of the coke clearing connecting piece is connected to one side of the two radially extending pieces close to the first part; The two ends of the first axial extension member are respectively fixedly connected to the coke clearing connection members at the two ends of the device body; The first axially extending member and the coke cleaning connecting member form the outer contour of the device body, and the coke cleaning portion is arranged on a side of the first axially extending member close to the inner wall of the rotary kiln.

4. The decoking device according to claim 3, characterized in that: The de-coking connecting members connected to both ends of the same two radially extending members are both connected to the ends of the radially extending members on one side close to the first portion; and / or, The de-coking connecting members connected to both ends of the same two radially extending members are both connected to the middle portion of one side of the radially extending member close to the first portion.

5. The decoking device according to claim 3, characterized in that: The device body further comprises a counterweight, and the counterweight is located at an end of the radially extending member on a side close to the first portion; and / or, The number of the first axially extending members is 2-4; and / or, The device body further comprises a first reinforcing member, two ends of which are respectively connected to the middle of the radially extending member and the middle of one side of the decoking connecting member; and / or, The device body is arranged in an axisymmetric manner along the extending direction of the radially extending member.

6. The decoking device according to claim 3, characterized in that: The device body is also provided with a supporting connection member; The supporting connecting members are arranged at both ends of the device body along the axial direction of the rotary kiln, and the middle parts of the supporting connecting members are connected to one side of the radially extending member close to the second part; The supporting portion is arranged on one side of the supporting connecting member close to the inner wall of the rotary kiln.

7. The decoking device according to claim 6, characterized in that: The number of the supporting connecting members is two, and the middle parts of the two supporting connecting members are connected to the end of the radially extending member on one side close to the second portion; and / or, The device body is further provided with a second axial extension member extending along the axial direction of the rotary kiln, and two ends of the second axial extension member are respectively connected to the middle parts of the two supporting connecting members; and / or, The device body also includes a second reinforcing member, and two ends of the second reinforcing member are respectively connected to the middle of one side of the radially extending member close to the second portion and the middle of one side of the supporting connecting member.

8. The decoking device according to claim 6, characterized in that: Ends of all the coke clearing connectors and all the supporting connectors provided at the same end of the device body along the axial direction of the rotary kiln are located on the same circumferential side.

9. The decoking device according to claim 1, characterized in that: A ratio of a length of the decoking device along a radial direction of the rotary kiln to a length of the rotary kiln in the radial direction is less than 97%.

10. The decoking device according to any one of claims 1 to 9, characterized in that: 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; and / or, The shape of the support portion is adapted to the inner wall of the rotary kiln; and / or, A third reinforcing member is provided at a portion of the support portion that contacts the inner wall of the rotary kiln.

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