Anti-coking lining structure of hazardous waste incineration rotary kiln

Abstract

The utility model relates to rotary kiln technical field, and disclose a kind of anti-coking lining structure of dangerous waste incineration rotary kiln, including rotary kiln body, the bottom surface of rotary kiln body is equipped with pedestal, rotary kiln body side wall is equipped with feed pipe, there is feed hopper in communication on the feed pipe, auxiliary agent adding assembly is installed on the feed pipe, feed pipe is equipped with feed assembly, the feed assembly includes the back-shaped frame fixed on the pedestal, motor is fixed on the back-shaped frame, the output of motor is fixed with transmission shaft, spiral auger is fixed on the end side of transmission shaft, the end side of spiral auger is fixed with connecting column, scraper assembly is installed on the end side of connecting column.The utility model is added by scraper assembly cooperation anti-coking additive, from the two aspects of preventing coking and removing already formed coking, form double protection, further reduce the coking phenomenon of rotary kiln inner wall, improve the stability and reliability of rotary kiln operation.

Description

Technical Field

[0001] This utility model relates to the field of rotary kiln technology, specifically to an anti-coking lining structure for a rotary kiln for hazardous waste incineration. Background Technology

[0002] A rotary kiln is a combustion kiln with a refractory lining inside a cylindrical body made of steel plates. Rotary kilns have a large combustion space and thermal field, resulting in excellent combustion performance. Therefore, they can supply sufficient combustion air, making them a well-equipped and highly effective combustion device. In the field of industrial hazardous waste treatment, rotary kilns are the core equipment for achieving the harmless and reduced-volume treatment of hazardous waste. Through the high-temperature incineration environment inside the cylinder, they thoroughly decompose and destroy hazardous waste, ensuring that the treated products meet environmental emission standards.

[0003] However, hazardous waste has a complex composition, often containing a large amount of easily molten and easily agglomerated substances. During high-temperature incineration, these substances form molten ash, some of which adheres to the inner wall of the rotary kiln. As the incineration operation continues, the attached ash gradually accumulates and thickens, forming a hard coking layer.

[0004] Currently, the main approach to addressing coking issues in rotary kilns is to apply an anti-coking coating to the inner wall of the kiln. However, in practice, relying solely on this coating is insufficient to cope with the complex high-temperature environment and diverse coking components present during hazardous waste incineration. The anti-coking effect is very limited, failing to fundamentally prevent molten ash or carbides from adhering to the kiln wall and forming a coking layer. Furthermore, coking removal primarily relies on periodic manual cleaning, which requires interrupting the normal incineration operation of the rotary kiln. This not only disrupts the continuous process of hazardous waste treatment and reduces overall efficiency but also exposes operators to a high-temperature, high-risk working environment, increasing both the workload and safety risks during operations.

[0005] Therefore, we propose an anti-coking lining structure for a rotary kiln for hazardous waste incineration to address the aforementioned problems. Utility Model Content

[0006] The purpose of this invention is to provide an anti-coking lining structure for a rotary kiln for hazardous waste incineration, in order to solve the problems mentioned in the background art, such as the inability of existing rotary kilns to cope with the complex high-temperature environment and diverse coking components during hazardous waste incineration, the very limited anti-coking effect, and the inconvenience of cleaning the coking layer.

[0007] To achieve the above objectives, this utility model provides the following technical solution: an anti-coking lining structure for a rotary kiln for hazardous waste incineration, comprising a rotary kiln body, a base mounted on the bottom surface of the rotary kiln body, a feed pipe mounted on the side wall of the rotary kiln body, a feed hopper connected to the feed pipe, an additive addition assembly mounted on the feed pipe, a conveying assembly mounted inside the feed pipe, the conveying assembly including a U-shaped frame fixed on the base, a motor fixed on the U-shaped frame, a drive shaft fixed to the output end of the motor, a spiral auger fixed to the end of the drive shaft, a connecting column fixed to the end of the spiral auger, and a scraper assembly mounted to the end of the connecting column.

[0008] Preferably, the additive component includes a first support plate and a second support plate fixed to the side wall of the rotary kiln body. The first support plate has a discharge port, and the bottom surface of the first support plate is connected to a discharge pipe.

[0009] Preferably, a mounting frame is fixed to the side wall of the rotary kiln body, an electric push column is fixed to the mounting frame, a fixing plate is fixed to the output end of the electric push column, a sealing plate is fixed to the fixing plate, a material cylinder is fixed to the end side of the sealing plate, an additive storage tank is installed on the rotary kiln body, and a feed pipe is connected to the additive storage tank.

[0010] Preferably, the material cylinder is hollow, the top opening of the material cylinder is adapted to the discharge port, the bottom opening of the material cylinder is connected to the discharge pipe, the sealing plate slides against the first support plate, and the upper and lower ends of the material cylinder slide against the first support plate and the second support plate, respectively.

[0011] Preferably, the scraper assembly includes an outer scraper fixed to the end side of the connecting column, the outer scraper having a cavity, a plurality of telescopic rods installed in the cavity, a spring sleeved on the outer ring of the telescopic rod, an inner scraper fixed to the end side of the telescopic rod, and the inner scraper fitting against the inner wall of the rotary kiln body.

[0012] Preferably, one end of the spring is fixedly connected to the outer scraper, the other end of the spring is fixedly connected to the inner scraper, the inner scraper is slidably connected to the cavity, and multiple telescopic rods and springs are arranged in a linear array.

[0013] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model allows for the precise addition of anti-coking additives to the rotary kiln as needed, effectively reducing the probability of coking on the inner wall of the kiln during hazardous waste incineration and improving the anti-coking effect from the source. Simultaneously, suitable anti-coking additives can be selected based on the actual composition of the hazardous waste, adapting to different types of hazardous waste incineration scenarios, enhancing the versatility and applicability of the structure, meeting diverse anti-coking needs, and avoiding insufficient effectiveness due to a single anti-coking method. Furthermore, this method does not require interruption of incineration operations, ensuring the normal incineration efficiency of the rotary kiln, avoiding disruption to the continuity of incineration operations due to coking or decoking, and solving the problem of manual decoking disrupting the processing flow.

[0014] 2. This utility model utilizes a scraper assembly to scrape the inner wall of the rotary kiln in real time, promptly removing coking material adhering to the kiln during combustion without interrupting normal combustion operations. This avoids disrupting the processing flow and eliminates the need for operators to be exposed to high-temperature, high-risk environments, reducing the labor intensity and operational safety risks for workers. Furthermore, it can remove coking material from the inner wall more thoroughly, effectively preventing the thickening of coking material from affecting the heat exchange efficiency of the rotary kiln and preventing damage to the kiln lining, thereby extending the service life of the rotary kiln.

[0015] 3. This utility model provides dual protection by combining the scraper assembly with the addition of anti-coking additives, which prevents coking and removes existing coking, further reducing coking on the inner wall of the rotary kiln. Compared with the single method of relying solely on coating to prevent coking, it significantly improves the stability and reliability of rotary kiln operation.

[0016] 4. This utility model can continuously and evenly transport the mixture of hazardous waste and anti-coking additive in the feed pipe into the rotary kiln, avoiding material accumulation and blockage in the feed pipe, ensuring smooth material transportation, and providing a stable material supply for incineration operations. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the structure of the feed pipe, additive addition component, conveying component and scraper component of this utility model; Figure 3 For the present utility model Figure 2 Cross-sectional structural diagram; Figure 4 For the present utility model Figure 3 Enlarged structural diagram at point A in the middle; Figure 5 A schematic diagram of the additive component structure of this utility model; Figure 6 This is a schematic diagram of the material conveying assembly structure of this utility model.

[0018] In the diagram: 1. Rotary kiln body; 101. Base; 2. Feed pipe; 3. Feed hopper; 4. Additive additive assembly; 41. Support plate one; 42. Discharge port; 43. Support plate two; 44. Discharge pipe; 45. Mounting frame; 46. Electric push column; 47. Fixing plate; 48. Sealing plate; 49. Material cylinder; 410. Additive storage tank; 411. Feed pipe; 5. Conveying assembly; 51. Reverse frame; 52. Motor; 53. Drive shaft; 54. Spiral auger; 6. Connecting column; 7. Scraper assembly; 71. Outer scraper; 72. Cavity; 73. Telescopic rod; 74. Spring; 75. Inner scraper. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Example 1: Please refer to Figure 1 - Figure 6 A coking prevention lining structure for a rotary kiln for hazardous waste incineration includes a rotary kiln body 1, a base 101 installed on the bottom surface of the rotary kiln body 1, a feed pipe 2 installed on the side wall of the rotary kiln body 1, a feed hopper 3 connected to the feed pipe 2, and an additive addition component 4 installed on the feed pipe 2. The additive addition component 4 includes a first support plate 41 and a second support plate 43 fixed to the side wall of the rotary kiln body 1. A discharge port 42 is opened on the support plate, and a discharge pipe 44 is connected to the bottom surface of the first support plate 41.

[0021] A mounting frame 45 is fixed to the side wall of the rotary kiln body 1. An electric pusher column 46 is fixed to the mounting frame 45. A fixing plate 47 is fixed to the output end of the electric pusher column 46. A sealing plate 48 is fixed to the fixing plate 47. A material cylinder 49 is fixed to the end of the sealing plate 48. An additive storage tank 410 is installed on the rotary kiln body 1. The additive storage tank 410 can store various additives such as silicon-based additives, calcium-magnesium composite additives, and phosphate additives. The specific additives need to be selected according to the actual situation. They must be suitable for the high-temperature incineration environment of the rotary kiln and be able to react with the easily coking components in hazardous waste, so that they combine with the molten ash produced by the incineration of hazardous waste, reduce the melting temperature range of the ash, and change the viscosity of the ash, making it less likely to adhere and solidify on the inner wall of the rotary kiln, thereby reducing coking formation. After melting, it can be discharged with the ash. A feed pipe 411 is connected to the additive storage tank 410.

[0022] The material cylinder 49 is hollow. The top opening of the material cylinder 49 is matched with the discharge port 42, and the bottom opening of the material cylinder 49 is connected to the discharge pipe 44. The sealing plate 48 slides in contact with the support plate 41, and the upper and lower ends of the material cylinder 49 slide in contact with the support plate 41 and the support plate 43 respectively.

[0023] In the initial state of this embodiment, the material cylinder 49 installed on the fixed plate 47 is aligned with the discharge pipe 411 at the bottom of the additive storage tank 410. At this time, the anti-coking additive pre-loaded in the additive storage tank 410 will naturally fall into the hollow material cylinder 49 along the discharge pipe 411. The additive is temporarily stored in the material cylinder 49, waiting to be added, ready for subsequent addition as needed. At the same time, in this state, the discharge port 42 on the support plate 41 is not blocked by the sealing plate 48, but because the material cylinder 49 is not connected to the discharge pipe 44, the additive only stays in the material cylinder 49 and will not leak randomly.

[0024] When the rotary kiln body 1 enters the incineration operation stage and it is necessary to add anti-coking additives to the system, the electric push column 46 fixed on the mounting bracket 45 on the side wall of the rotary kiln body 1 is activated. After the electric push column 46 is energized, its output end will drive the fixed plate 47 fixedly connected to it to move forward in the horizontal direction. Since the fixed plate 47 is fixedly connected to the sealing plate 48 and the material cylinder 49, the sealing plate 48 and the material cylinder 49 will move forward synchronously with the fixed plate 47.

[0025] During the movement, the sealing plate 48 gradually slides and adheres to the surface of the support plate 41, slowly blocking the discharge port 42 on the support plate 41. During this process, due to the blocking effect of the sealing plate 48, the discharge pipe 411 of the additive storage tank 410 is blocked, preventing the additive from continuing to fall into the barrel 49 from the discharge pipe 411, thus avoiding waste caused by the continuous falling of the additive during non-addition periods. Simultaneously, the upper and lower ends of the barrel 49 remain tightly fitted and slide against the support plate 41 and the support plate 43 respectively, forming a good sealing effect. Even if the barrel 49 already contains additives, leakage will not occur during the movement, ensuring the effective retention of the additives.

[0026] As the electric pusher column 46 continues to drive the material cylinder 49 forward, when the material cylinder 49 moves directly above the discharge pipe 44 connected to the bottom surface of the support plate 41, the bottom opening of the material cylinder 49 is completely aligned with the opening of the discharge pipe 44, and the two pipes are connected. At this time, the anti-coking additive that was originally stored in the material cylinder 49 will fall into the discharge pipe 44 under the action of gravity. Since the discharge pipe 44 is connected to the feed pipe 2 on the side wall of the rotary kiln body 1, the additive will continue to flow along the discharge pipe 44 and eventually enter the interior of the feed pipe 2.

[0027] At this point, the hazardous waste has entered the feed pipe 2 through the feed hopper 3. The anti-coking agent will initially mix with the hazardous waste in the feed pipe 2, and then both will be sent into the rotary kiln body 1 for incineration. During the incineration process, the anti-coking agent will react with the easily coking components in the hazardous waste or change the physical properties of these components, thereby effectively reducing the probability of coking on the inner wall of the rotary kiln during waste incineration, achieving the core purpose of anti-coking, and ensuring the normal incineration efficiency of the rotary kiln.

[0028] After the additive is added, the electric push column 46 is reversed, causing the fixing plate 47, sealing plate 48 and material cylinder 49 to reset synchronously. At this time, the sealing plate 48 gradually separates from the discharge port 42, the material cylinder 49 is aligned with the discharge pipe 411 again, and the additive in the additive storage tank 410 falls back into the material cylinder 49, waiting for the next addition, thus completing one complete additive addition cycle.

[0029] Example 2: This example is an improvement upon Example 1. For details, please refer to [link / reference]. Figure 1 - Figure 4 The feed pipe 2 is equipped with a material conveying assembly 5. The material conveying assembly 5 includes a spiral frame 51 fixed on the base 101. A motor 52 is fixed on the spiral frame 51. A drive shaft 53 is fixed at the output end of the motor 52. A spiral auger 54 is fixed at the end of the drive shaft 53. A connecting column 6 is fixed at the end of the spiral auger 54. A scraper assembly 7 is installed at the end of the connecting column 6.

[0030] The scraper assembly 7 includes an outer scraper 71 fixed to the end of the connecting column 6. A cavity 72 is provided inside the outer scraper 71. Multiple telescopic rods 73 are installed inside the cavity 72. A spring 74 is sleeved on the outer ring of the telescopic rod 73. An inner scraper 75 is fixed to the end of the telescopic rod 73. The inner scraper 75 is in contact with the inner wall of the rotary kiln body 1.

[0031] One end of the spring 74 is fixedly connected to the outer scraper 71, and the other end of the spring 74 is fixedly connected to the inner scraper 75. The inner scraper 75 is slidably connected to the cavity 72. Multiple telescopic rods 73 and springs 74 are arranged in a linear array.

[0032] In this embodiment: when hazardous waste and anti-coking additive enter the feed pipe 2, the motor 52 fixed on the base 101 and the ring frame 51 is started first. After the motor 52 is powered on and running, its output end will drive the transmission shaft 53 to rotate synchronously, and the spiral auger 54 fixed on the end of the transmission shaft 53 will also rotate together with the transmission shaft 53.

[0033] During rotation, the auger 54 continuously and evenly conveys the mixture of hazardous waste and anti-coking additives from the feed pipe 2 into the rotary kiln body 1, ensuring a stable entry of materials into the incineration zone and preventing material accumulation and blockage in the feed pipe 2. It also provides a stable material supply for subsequent incineration and anti-coking operations. The scraper assembly 7, connected to the auger 54 via the connecting column 6, rotates synchronously within the rotary kiln body 1 along with the drive shaft 53, achieving dynamic scraping of the inner wall of the rotary kiln. When the scraper assembly 7 is in operation, the outer scraper 71 rotates with the connecting column 6. The multiple telescopic rods 73 and springs 74 installed in the inner cavity 72 of the outer scraper 71 provide a continuous elastic force to the inner scraper 75. Since the inner scraper 75 is in close contact with the inner wall of the rotary kiln body 1, and one end of the spring 74 on the outer ring of the telescopic rod 73 is fixed to the outer scraper 71 and the other end is fixed to the inner scraper 75, when the scraper assembly 7 rotates to scrape the inner wall, the spring 74 will automatically extend and retract according to the actual curvature or small protrusions of the inner wall of the rotary kiln, driving the inner scraper 75 to slide in the cavity 72, ensuring that the inner scraper 75 is always in close contact with the inner wall and will not miss any scraping due to unevenness of the inner wall.

[0034] Multiple telescopic rods 73 and springs 74 arranged in a linear array can further improve the stability of the inner scraper 75 and the comprehensiveness of scraping, and scrape off the coking material that may adhere to the inner wall of the rotary kiln during the incineration process in real time. Combined with the anti-coking additive in Example 1, it provides dual protection from both prevention and removal aspects, minimizing the coking phenomenon on the inner wall of the rotary kiln, and ensuring the normal incineration efficiency and service life of the rotary kiln.

[0035] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0036] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A coking prevention lining structure for a rotary kiln for hazardous waste incineration, comprising a rotary kiln body (1), characterized in that: A base (101) is installed on the bottom surface of the rotary kiln body (1). A feed pipe (2) is installed on the side wall of the rotary kiln body (1). A feed hopper (3) is connected to the feed pipe (2). An additive addition component (4) is installed on the feed pipe (2). A conveying component (5) is installed inside the feed pipe (2). The conveying component (5) includes a spiral frame (51) fixed on the base (101). A motor (52) is fixed on the spiral frame (51). A drive shaft (53) is fixed at the output end of the motor (52). A spiral auger (54) is fixed at the end of the drive shaft (53). A connecting column (6) is fixed at the end of the spiral auger (54). A scraper assembly (7) is installed at the end of the connecting column (6).

2. The anti-coking lining structure for a rotary kiln for hazardous waste incineration according to claim 1, characterized in that: The additive addition component (4) includes a support plate one (41) and a support plate two (43) fixed to the side wall of the rotary kiln body (1). The support plate is provided with a discharge port (42), and the bottom surface of the support plate one (41) is connected to a discharge pipe (44).

3. The anti-coking lining structure for a rotary kiln for hazardous waste incineration according to claim 2, characterized in that: The rotary kiln body (1) is fixed with a mounting frame (45) on its side wall. An electric push column (46) is fixed on the mounting frame (45). A fixing plate (47) is fixed at the output end of the electric push column (46). A sealing plate (48) is fixed on the fixing plate (47). A material cylinder (49) is fixed on the end side of the sealing plate (48). An additive storage tank (410) is installed on the rotary kiln body (1). A feed pipe (411) is connected to the additive storage tank (410).

4. The anti-coking lining structure for a rotary kiln for hazardous waste incineration according to claim 3, characterized in that: The material cylinder (49) is hollow. The top opening of the material cylinder (49) is adapted to the discharge port (42). The bottom opening of the material cylinder (49) is connected to the discharge pipe (44). The sealing plate (48) slides against the support plate one (41). The upper and lower ends of the material cylinder (49) slide against the support plate one (41) and the support plate two (43) respectively.

5. The anti-coking lining structure for a rotary kiln for hazardous waste incineration according to claim 1, characterized in that: The scraper assembly (7) includes an outer scraper (71) fixed to the end side of the connecting column (6). A cavity (72) is provided in the outer scraper (71). A plurality of telescopic rods (73) are installed in the cavity (72). A spring (74) is sleeved on the outer ring of the telescopic rod (73). An inner scraper (75) is fixed to the end side of the telescopic rod (73). The inner scraper (75) is in contact with the inner wall of the rotary kiln body (1).

6. The anti-coking lining structure for a rotary kiln for hazardous waste incineration according to claim 5, characterized in that: One end of the spring (74) is fixedly connected to the outer scraper (71), and the other end of the spring (74) is fixedly connected to the inner scraper (75). The inner scraper (75) is slidably connected to the cavity (72). Multiple telescopic rods (73) and springs (74) are arranged in a linear array.

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