Anti-ring device for rotary kiln
By designing a prismatic scraper device at the tail of the rotary kiln and combining it with refractory materials, the problem of difficult and inefficient removal of rings in the rotary kiln was solved, achieving efficient, safe, and low-cost ring removal.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- LONZA GUANGZHOU ENG & CONSULTING CO LTD
- Filing Date
- 2025-07-28
- Publication Date
- 2026-07-31
AI Technical Summary
Existing rotary kiln anti-ringing devices are difficult to operate continuously in high-temperature environments, and existing removal methods such as high-temperature coking and external force coking have problems such as high cost, low efficiency, and significant safety hazards.
A rotary kiln tail anti-ring device is designed, which uses a prismatic scraper with a certain thickness, sets first and second working surfaces, scrapes off the ring material on the inner wall and end face of the rotary kiln, and uses refractory materials to improve strength and durability.
It improves the efficiency of removing ring-shaped materials, reduces the risk of equipment damage, reduces maintenance requirements, lowers operating costs, and ensures the stable operation of the rotary kiln.
Smart Images
Figure CN224580685U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of rotary kiln auxiliary equipment, and specifically relates to an anti-ringing device for rotary kilns. Background Technology
[0002] The causes of ring formation in rotary kilns are complex, especially when the material composition is complex and variable. There are generally two methods for dealing with ring formation in rotary kilns: one is high-temperature coking, which involves increasing the fuel quantity to raise the kiln temperature above the melting point of the ring-forming material, causing the ring to melt and collapse, thus removing it; the other is using external force to remove the ring, which involves directly applying high-pressure water (water jet) or hard objects (such as metal pipes or sheets) to the ring (e.g., using a steel pipe to poke the coke), causing the ring to crack and fall off, thus removing it.
[0003] High-temperature coking requires three processes: heating, coking, and cooling. Due to its lengthy process, it cannot be used frequently. Furthermore, when the material processed by the rotary kiln contains a large amount of coking-forming substances, normal feeding will be impossible during coking, necessitating the use of fuels such as natural gas, leading to increased operating costs. In addition, the thickness or height of the coke rings during high-temperature coking begins to affect normal discharge, especially at the kiln tail. At the start of high-temperature coking, the coke rings are already very thick, severely impacting discharge. Therefore, large coke lumps will fall from the kiln tail during coking. These large coke lumps are highly likely to become stuck in the slag discharge port, preventing discharge and even damaging the slag discharge equipment. For water-sealed slag discharge ports, large coke lumps can easily evaporate the water seal or cause significant overflow, leading to water seal failure and, in severe cases, even furnace shutdown. Especially when the melting point of the coking material is high, the time and fuel required for high-temperature coking increase accordingly, and the temperature may even fail to reach the melting point of the coking material, resulting in coking failure. Finally, during the high-temperature coking process, the temperature fluctuates greatly and rapidly, and the temperature is higher than the normal operating temperature of the rotary kiln. Therefore, if this process is carried out frequently, it will have an adverse effect on the service life of the refractory material of the rotary kiln.
[0004] External methods for removing slag include hydraulic deslag removal (such as water jets), manual deslag removal, and mechanical deslag removal. Hydraulic deslag removal is quick and does not damage the refractory material. However, due to the high temperature inside the rotary kiln, the insertion length of the water jet is limited. Therefore, the water jet operator must be positioned close enough to the kiln tail to achieve optimal results. Thus, if the operating port is too far from the kiln tail where the slag ring forms, the water jet will be unusable. Furthermore, water jets used for deslag removal are specialized equipment; their deployment and arrival take time, and their operating costs are high, further limiting their use. Manual deslag removal involves manually using steel pipes through inspection holes or manholes. The steel pipes will soften or deform under high temperatures, requiring immediate replacement. Additionally, when the inspection hole or manhole is open, the positive pressure inside the rotary kiln can cause high-temperature flue gas to escape and burn the operator. Moreover, manual deslag removal is ineffective when the slag ring is very hard.
[0005] The ring formations within a rotary kiln generally occur at three locations: the kiln head, the kiln middle, and the kiln tail. Ring formations at the kiln head are easily removed by external force through the inspection port of the kiln head hood. Ring formations in the kiln middle can be removed using high-temperature coking. For ring formations at the kiln tail, both high-temperature coking and external force removal can be employed. High-temperature coking methods include simply increasing the amount of fuel entering from the kiln head to raise the temperature for coking, or installing a dedicated fuel inlet (such as a natural gas injector) at the kiln tail to increase the local temperature for coking (high-temperature coking as a method already has relevant patents). External force removal methods include using water jets or manual coking. All of these methods have been applied in practice and have successfully removed the ring formations.
[0006] The existing patent proposes a "rotary kiln anti-ring device" that involves axially installing a whole strip of heat-resistant steel scraper from the kiln head to the kiln tail to continuously remove rings. However, this structure has problems: the temperature inside the rotary kiln is as high as nearly 1,000 degrees Celsius, and the length of the rotary kiln is generally quite long. Under the long-term suspended installation, high-temperature roasting, and material collision inside the rotary kiln, it is difficult to ensure the rigidity of the scraper, thus making it difficult to work continuously. Utility Model Content
[0007] To address the problem of inadequate scraping caused by unreasonable design of existing rotary kiln anti-ring devices, this utility model provides a kiln tail anti-ring device for rotary kilns. By setting a scraper with a certain thickness and a first working surface and a second working surface on the scraper, the scraping effect is improved while ensuring that the device itself has relatively ideal strength.
[0008] The technical solution adopted by this utility model is as follows: A kiln tail anti-ringing device for rotary kilns, comprising:
[0009] The base is located at the tail end of the rotary kiln;
[0010] A scraper is mounted on the base;
[0011] The scraper has a prism-shaped protrusion and an extension. The protrusion can extend into the rotary kiln from the end of the rotary kiln. The extension is connected to the base. The protrusion has a first working surface, which corresponds to the inner wall surface of the rotary kiln. The extension has a second working surface, which corresponds to the end face of the rotary kiln.
[0012] When the rotary kiln rotates, the first working surface is used to scrape off the ring-like material on the inner wall of the rotary kiln, and the second working surface is used to scrape off the ring-like material at the end face of the rotary kiln.
[0013] This application proposes a kiln tail anti-ringing device for rotary kilns, which has a first working surface and a second working surface. When the rotary kiln is rotating, it can directly scrape off the rings on the inner wall and end face of the rotary kiln. It is set at the tail end of the rotary kiln, and the rings are scraped off before they accumulate and connect, which is highly efficient. Moreover, the protruding part and the extension part are prismatic, and the entire scraper has a certain thickness. Compared with flat scrapers, it has more ideal strength, is less prone to breakage, and has a relatively stable structure.
[0014] Furthermore, the bottom of the extension is provided with a second inclined surface, and the second working surface connects the second inclined surface and the first working surface. The second working surface is connected to the second inclined surface, and the effective working area of the second working surface gradually increases, which can ensure the strength of the extension. The first working surface and the second working surface are connected to form a working area with an opening, so that as long as the ring-like material penetrates into this area, it can be easily scraped off, resulting in high scraping efficiency. Moreover, the downward sloping second inclined surface can lower the center of gravity of the extension, reducing the structural instability caused by an excessively high center of gravity.
[0015] Furthermore, the first working surface and the second working surface are set perpendicularly. In this arrangement, the two working surfaces are set perpendicularly, and there is no rounded corner at their junction, which forms a sharp cutting angle that can quickly scrape off the ring-like material and ensure the scraping effect.
[0016] Furthermore, the bottom of the protrusion has a first inclined surface, which is set at an angle to the first working surface, so that the protrusion can effectively scrape off the ring material located on the inner wall of the rotary kiln.
[0017] Furthermore, the first working surface is preferably a vertical surface.
[0018] Furthermore, the scraper is a refractory component made of refractory material. Existing scrapers are made of metal, and the flue gas and dust in the rotary kiln can corrode the metal scraper. This application sets the scraper as a refractory component, which can effectively reduce the impact of flue gas and dust on the scraper, and the refractory component itself also has a certain strength, ensuring the service life of the scraper.
[0019] Furthermore, the base includes a metal seat connected to the scraper, the metal seat being attached to the bottom of the extension. The metal seat has high strength, ensuring durability.
[0020] Furthermore, the base is equipped with casters at its bottom to facilitate position adjustment. This design allows for easier positioning of the base, enabling the entire device to be positioned closer to the coiled material and effectively reducing residue.
[0021] Furthermore, the base is mounted on a bottom plate, and at least three positioning plates are connected to the bottom plate. The positioning plates surround the outside of the base, and each positioning plate is fitted with a positioning stud. The base is positioned by the positioning studs and nuts mounted on the positioning studs. The positioning plates form a space where the base can be finely adjusted. The positioning studs abut against or connect to a metal seat. By screwing in and out the nuts, the base can be adjusted to move radially or axially along the rotary kiln. After the base is adjusted to the correct position, it can be positioned using the positioning studs.
[0022] The beneficial effects of this utility model are as follows: This application is for a kiln tail anti-ring device for rotary kilns. The entire device is set at the tail end of the rotary kiln and is scraped off before the ring material accumulates and connects. The position is reasonable. The first working surface and the second working surface can directly scrape off the ring material on the inner wall and end face of the rotary kiln when the rotary kiln is rotating. The working efficiency is high. Moreover, the protruding part and the extension part are prismatic, and the entire scraper has a certain thickness. Compared with the flat scraper, it has more ideal strength and is less prone to breakage. It has better strength and a relatively stable structure. Attached Figure Description
[0023] Figure 1 This is a schematic diagram of the kiln tail anti-ringing device for rotary kilns in this application.
[0024] Figure 2 This is a schematic diagram of the scraper and its base.
[0025] Figure 3 A schematic diagram of the structure of the anti-ringing device for the kiln tail of a rotary kiln installed on the rotary kiln.
[0026] Figure 4 A schematic diagram of the structure of the anti-ringing device for the kiln tail of a rotary kiln, installed inside the rotary kiln.
[0027] Figure 5 A schematic diagram of the structure of the anti-ringing device at the tail of a rotary kiln when it comes into contact with the ring-like material at the tail end of the rotary kiln.
[0028] Figure 6 This is a schematic diagram of the base structure;
[0029] In the diagram: 1-Base; 11-Metal seat; 12-Wheel caster; 13-Support column; 14-Anchor nail; 2-Scraper; 21-Protrusion; 211-First working surface; 212-First inclined surface; 22-Extension; 221-Second working surface; 222-Second inclined surface; 3-Base plate; 4-Positioning plate; 5-Positioning stud; 51-Nut; 6-Rotary kiln; 7-Slag hopper; A-Clad material; A1-Clad material at the end face of the rotary kiln; A2-Clad material on the inner wall of the rotary kiln. Detailed Implementation
[0030] The technical solutions of the embodiments of this utility model will be explained and described below with reference to the accompanying drawings. However, the following embodiments are only preferred embodiments of this utility model and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments in the implementation methods without creative effort are all within the protection scope of this utility model.
[0031] This embodiment provides a kiln tail anti-ringing device for rotary kilns, such as... Figures 1 to 6 As shown, it includes:
[0032] The base 1 is located at the tail end of the rotary kiln 6;
[0033] Scraper 2 is disposed on the base 1; preferably, scraper 2 is disposed on slag hopper 6 located at the tail end of rotary kiln 6;
[0034] The scraper 2 has a prism-shaped protrusion 21 and an extension 22. The protrusion 21 can extend into the rotary kiln 6 from the end of the rotary kiln 6. The extension 22 is connected to the base 1. The protrusion 21 is provided with a first working surface 211, which corresponds to the inner wall surface of the rotary kiln 6. The extension 22 is provided with a second working surface 221, which corresponds to the end face of the rotary kiln 6.
[0035] When the rotary kiln 6 rotates, the first working surface 211 is used to scrape off the ring material A2 on the inner wall of the rotary kiln, and the second working surface 221 is used to scrape off the ring material A1 at the end face of the rotary kiln.
[0036] This application proposes a kiln tail anti-ring device for rotary kiln 6, which has a first working surface 211 and a second working surface 221. When the rotary kiln 6 is rotating, it can directly scrape off the ring material A on the inner wall and end face of the rotary kiln 6. It is set at the tail end of the rotary kiln 6, so that the ring material A is not scraped off immediately, which has high working efficiency. Moreover, the protruding part 21 and the extension part 22 are prismatic, and the entire scraper 2 has a certain thickness. Compared with the flat scraper 2, it has more ideal strength, is not prone to breakage, has better strength, and has a relatively stable structure.
[0037] The protruding portion 21 has a first inclined surface 212, which is located at the bottom of the protruding portion 21 and is connected to the first working surface 211 at an angle. In this configuration, the protruding portion 21 can extend a portion into the rotary kiln 6 from the end of the rotary kiln 6, and there is a certain angle between the first working surface 211 and the first inclined surface 212, so that the protruding portion 21 can effectively scrape off the ring material A2 located on the inner wall surface of the rotary kiln.
[0038] The bottom of the extension 22 is provided with a second inclined surface 222, which is on the same plane as the first inclined surface 212 and smoothly connected. The second working surface 221 connects the second inclined surface 222 and the first working surface 211. The second working surface 221 is connected to the second inclined surface 222, and the effective working area of the second working surface 221 gradually increases, which can ensure the strength of the extension 22. The first working surface 211 and the second working surface 221 are connected to form a working area with an opening. As long as the ring material A penetrates into this area, it can be easily scraped off, resulting in high scraping efficiency. Moreover, the downwardly inclined second inclined surface 222 can lower the center of gravity of the extension 22, reducing the structural instability caused by an excessively high center of gravity. In addition, the first inclined surface 212 and the second inclined surface 222 are located on the same plane, which can realize the integral molding of the protrusion 21 and the extension 22, reducing the processing difficulty of the scraper 2.
[0039] The first working surface 211 is preferably a vertical surface, and the second working surface 221 is preferably a vertical surface, so that when the rotary kiln 6 rotates, the two working surfaces can provide a relatively ideal scraping force.
[0040] The first working surface 211 and the second working surface 221 are set perpendicularly. In this setting, the two working surfaces are set perpendicularly, and there is no rounded corner at the junction of the two, which will form a sharp cutting angle, which can quickly scrape off the ring-shaped material A and ensure the scraping effect.
[0041] The scraper 2 is a refractory component made of refractory material. Existing scrapers are made of metal, and the flue gas and dust in the rotary kiln can corrode the metal scraper. This application makes the scraper 2 a refractory component, which can effectively reduce the impact of flue gas and dust on the scraper, and the refractory component itself also has a certain strength, ensuring the service life of the scraper.
[0042] The base 1 includes a metal seat 11 connected to the scraper 2, and the metal seat 11 is connected to the bottom of the extension 22. The metal seat 11 has high strength to ensure durability. Multiple anchoring nails 14 are welded onto the metal seat 11. The scraper 2 is formed by directly casting refractory castable onto the metal seat 11. The ends of the anchoring nails 14 are open, so that the multiple anchoring nails 14 can be well anchored inside the scraper 2, ensuring a reliable connection between the scraper 2 and the metal seat 11.
[0043] The base 1 has a support column 13 and casters 12 at its bottom. The casters 12 are located at the bottom of the support column 13 to facilitate the adjustment of the base 1's position. This arrangement allows the base 1 to be positioned more easily so that the entire device can be closer to the coiled material A, effectively reducing residue.
[0044] The base 1 is mounted on the bottom plate 3, which preferably passes through the slag hopper 6 at the tail end of the rotary kiln 6. Three positioning plates 4 are connected to the bottom plate 3, surrounding the outside of the base 1. Each positioning plate 4 is fitted with a positioning stud 5. The base 1 is positioned by the positioning studs 5 and nuts 51 mounted on them. By screwing the nuts in and out, the length of the positioning screw 5 inside the positioning plate 4 changes, thus altering the position of the base 1. Two of the three positioning plates 4 are arranged opposite each other to prevent the base 1 from moving significantly horizontally (i.e., along the axis of the rotary kiln). The third positioning plate 4 is located behind the base 1 to prevent the scraper 2 from retracting under pressure. The positioning plates 4 are equipped with positioning studs 5; the two oppositely arranged studs 5 abut against the outside of the base 1, applying pressure and restricting its movement along the axial direction of the rotary kiln. The third positioning screw 5 is located on the rear side of the base 1, restricting the movement of the base 1 along the axial direction of the rotary kiln. At this time, the third positioning screw 5 can be reinforced and connected to the base 1 through a sleeve and a set screw, enabling the third positioning screw 5 to push and pull the base 1, which facilitates effective adjustment of the base 1's position. The three positioning plates 4 form a space for fine-tuning the position of the base 1. By screwing the positioning screws 5 in or out, the position of the base 1 can be adjusted. Once the base 1 is adjusted, it is difficult to move again, ensuring the stability and reliability of the structure.
[0045] The device described in this application demonstrates significant advantages in four aspects: material, cost, maintenance, and performance. In terms of material, the parts of the device that come into contact with the high-temperature environment are made of the same refractory material used inside the rotary kiln, thus ensuring long-term operation. Regarding cost, the device has a simple structure, small size, and low manufacturing cost. In terms of maintenance, after initial adjustment and placement, the device requires minimal or no maintenance and does not require additional energy, materials, or supplies. From a performance perspective, this device is an online anti-ringing device. Coking material is removed and falls off before it can form a ring, thus preventing the falling of large slag deposits, making it safe and efficient.
[0046] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Those skilled in the art should understand that this utility model includes, but is not limited to, the content described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of this utility model will be included within the scope of the claims.
Claims
1. An anti-ring device for a rotary kiln (6) characterized in that, include: The base (1) is located at the tail end of the rotary kiln (6); A scraper (2) is mounted on the base (1); The scraper (2) has a prism-shaped protrusion (21) and an extension (22). The protrusion (21) can extend into the rotary kiln (6) from the end of the rotary kiln (6). The extension (22) is connected to the base (1). The protrusion (21) is provided with a first working surface (211), which corresponds to the inner wall surface of the rotary kiln (6). The extension (22) is provided with a second working surface (221), which corresponds to the end face of the rotary kiln (6). When the rotary kiln (6) rotates, the first working surface (211) is used to scrape off the ring material on the inner wall surface of the rotary kiln (6), and the second working surface (221) is used to scrape off the ring material at the end face of the rotary kiln (6).
2. The anti-ring device for a rotary kiln (6) according to claim 1, characterized in that, The bottom of the extension (22) is provided with a second inclined surface (222), and the second working surface (221) connects the second inclined surface (222) and the first working surface (211).
3. Anti-ring formation device for a rotary kiln (6) according to claim 1 or 2, characterized in that The first working surface (211) is perpendicular to the second working surface (221).
4. The anti-ring formation device for a rotary kiln (6) according to claim 1 or 2, characterized in that The bottom of the protrusion (21) has a first inclined surface (212), which is set at an angle to the first working surface (211).
5. The anti-ring formation device for a rotary kiln (6) according to claim 1 or 2, characterized in that The first working surface (211) is a vertical surface.
6. The anti-ring formation device for a rotary kiln (6) according to claim 1 or 2, characterized in that The scraper is a refractory component made of refractory material.
7. The anti-ring formation device for a rotary kiln (6) according to claim 1 or 2, characterized in that The base (1) includes a metal seat (11) connected to the scraper (2), the metal seat (11) being connected to the bottom of the extension (22).
8. The anti-ring device for a rotary kiln (6) according to claim 7, characterized in that, The base (1) is provided with casters (12) at its bottom.
9. The anti-ring device for a rotary kiln (6) according to claim 7, characterized in that, The base (1) is mounted on a base plate (3), and at least three positioning plates (4) are connected to the base plate (3). The positioning plates (4) surround the outside of the base (1), and each positioning plate (4) is fitted with a positioning stud (5). The base (1) is positioned by the positioning stud (5) and a nut (51) on the positioning stud (5).