A device and method for improving the cleaning efficiency of a decomposition tank

Abstract

The application provides a device and method for improving cleaning efficiency of a decomposition tank, and relates to the technical field of alumina production, solves the technical problem that the existing decomposition tank cleaning device cannot accurately flush the scaling area and the flushing effect on stubborn scaling is limited. The application comprises a cleaning nozzle, a rotating disc arranged in a lifting manner, and a scraping disc rotatably arranged on the rotating disc; the scraping disc comprises a hinge rod connected to the rotating disc and a plurality of groups of scraping knives rotatably arranged at an inclination angle alpha with the hinge rod; the hinge rod is arranged at an inclination angle beta with the horizontal plane, and the sum of alpha and beta is 90 degrees; the cleaning nozzle is arranged on the hinge rod. The application greatly reduces the cleaning cost, reduces the labor input, shortens the construction period, reduces the cleaning risk, ensures the safety of workers, uses mechanical tools for cleaning, reduces the generation of waste water and waste gas, and is beneficial to environmental protection.

Description

Technical Field

[0001] This invention relates to the field of alumina production technology, and more specifically, to an apparatus and method for improving the cleaning efficiency of decomposition tanks. Background Technology

[0002] Decomposition tanks are common chemical equipment, mainly used for various chemical reactions. However, during use, a layer of scale gradually accumulates inside the decomposition tank. This scale can affect the normal operation of the tank and may even damage the equipment. Therefore, regular cleaning of the decomposition tank is essential. Traditional cleaning methods mainly include chemical cleaning and manual cleaning. Chemical cleaning is a commonly used method for cleaning decomposition tanks. Its basic principle is to inject sodium hydroxide solution into the decomposition tank, then heat it with steam to dissolve the scale, and finally use a chemical cleaning pump to circulate and discharge the dissolved scale. The advantage of this method is its simplicity, but it consumes a large amount of alkali solution and steam, resulting in high costs. Manual cleaning is another common method for cleaning decomposition tanks. Its basic principle is to first empty the material from the decomposition tank, then use a pneumatic hammer to break up the scale at the manhole door, allowing the remaining thinner to flow out. Then, using a suspended basket, the scale on the tank walls is manually cleaned. The advantage of this method is that it can directly remove the scale, but it requires a large amount of manpower, has high cleaning risks, and a long construction period.

[0003] Chemical cleaning methods consume large amounts of alkali and steam, resulting in high costs. Furthermore, this method is unsuitable for situations with significant scaling or where agitation malfunctions. Secondly, manual cleaning requires substantial manpower, carries high risks, is time-consuming, and inefficient. Additionally, both methods generate significant amounts of wastewater and exhaust gases, posing environmental pollution problems.

[0004] Therefore, a device for cleaning scale buildup in an alumina decomposition tank, as proposed in patent CN212041891U, uses a first and second flushing pipe to flush the tank walls and paddles, respectively, and a scraper to clean the tank walls. This utility model can clean scale buildup in an alumina decomposition tank. However, it only uses a traction rope to pull the flushing pipes, and the reaction force of the high-pressure flushing water can easily cause the traction rope and flushing pipes to shake, resulting in incomplete flushing and inability to accurately flush the scaled areas. Furthermore, the scraper has a limited cleaning range and low cleaning efficiency. Summary of the Invention

[0005] This invention provides an apparatus and method for improving the cleaning efficiency of decomposition tanks, in order to solve the technical problems of existing decomposition tank cleaning devices not being able to rinse thoroughly, not being able to accurately rinse scaled areas, and having limited rinsing effect on stubborn scale.

[0006] The embodiments of the present invention are achieved through the following technical solutions:

[0007] An apparatus for improving the cleaning efficiency of a decomposition tank includes a cleaning nozzle for rinsing the inner wall of the decomposition tank, a rotating disk that is raised and lowered, and a scraping disk that is rotatably mounted on the rotating disk for scraping material from the inner wall of the decomposition tank. The scraping disk includes a hinge rod for connecting the rotating disk and a plurality of scrapers that are rotatably mounted and inclined at an angle α to the hinge rod. The hinge rod is inclined at an angle β to the horizontal plane, and the sum of α and β is 90 degrees. The cleaning nozzle is mounted on the hinge rod.

[0008] Preferably, the decomposition tank further includes a cover plate for mounting the rotating disk and a manhole for removing scale.

[0009] Preferably, the cover plate is further provided with several sets of lifting rods for lifting and lowering the rotating disk, and the hinge rods are slidably connected to the edge of the rotating disk.

[0010] Preferably, the cover plate is provided with an annular groove for passing through the cleaning pipeline and an agitator for stirring the decomposition tank; the cleaning pipeline is connected to the cleaning nozzle; the rotating disk is configured as an annular shape for passing through the agitator.

[0011] Preferably, the scraper includes a scraper disc rotatably mounted on the hinge rod and scraper teeth disposed on the edge of the scraper disc, wherein the edge surface of the scraper teeth forms an angle of α degrees with the hinge rod.

[0012] Preferably, the cleaning nozzle is rotatably mounted on the hinge rod and forms an angle with the hinge rod in the vertical direction.

[0013] Preferably, it also includes a winch for lifting the cleaning pipeline and a movable pulley for suspending the cleaning pipeline.

[0014] A method for improving the cleaning efficiency of a decomposition tank using the aforementioned apparatus includes the following steps:

[0015] S1: Unload the material from the decomposition tank and open the manhole;

[0016] S2: Lower the rotating disc, adjust the tilt angle of the hinge rod so that the scraper is against the inner wall of the decomposition tank, turn on the cleaning nozzle, adjust the position of the scraper disc and the cleaning nozzle, and thoroughly clean the inner wall of the decomposition tank.

[0017] S3: After cleaning the scabs near the manhole, use a small loader and a small excavator to enter the disassembly tank for cleaning.

[0018] Preferably, in step S2, the rotation of the scraper disc is achieved by the reaction force of the hinge rod on the rotation of the rotating disc and the horizontal direction of the cleaning nozzle, and the pressure of the cleaning nozzle is 1400 bar-1600 bar.

[0019] Preferably, in step S2, the reaction force of the cleaning nozzle also includes a vertical reaction force to press the scraper disc downwards and tightly adhere it to the inner wall of the decomposition tank.

[0020] This technical solution involves cleaning the decomposition tank with a cleaning nozzle while simultaneously installing a scraper disc. The scraper disc rotates in both horizontal and vertical directions against the inner wall of the decomposition tank, scraping away scale, thanks to the reaction force of the high-pressure cleaning nozzle. Furthermore, following the habit of cleaning from top to bottom using the rotating disc, the scale is first scraped by the lower scraper disc before being cleaned by the upper cleaning nozzle, effectively cleaning and improving cleaning efficiency.

[0021] Since the decomposition tank is relatively high, the pressure delivered by the high-pressure cleaning truck should not be divided into multiple streams for cleaning. Only one set of cleaning nozzles is installed. With the lifting of the rotating plate and the rotation of the hinge rod, the inner wall of the decomposition tank can be rinsed in all directions, ensuring the rinsing pressure while ensuring thorough cleaning and high cleaning efficiency.

[0022] The structure is removed by first scraping and rinsing, and then the scraped scale is transported out of the decomposition tank by opening the manhole and using a small excavator and a small loader. This method achieves the goal of removing the structure by simple physical means, shortens the construction period, reduces cleaning costs, and reduces the risks of working at height.

[0023] The technical solutions of the embodiments of the present invention have at least the following advantages and beneficial effects:

[0024] 1. This invention uses a high-pressure cleaning truck and a small loading truck to clean the decomposition tank. Compared with the traditional chemical cleaning method, it does not require the consumption of a large amount of alkaline solution and steam, which greatly reduces the cleaning cost.

[0025] 2. This invention uses mechanical tools for cleaning, which greatly reduces the input of manpower. At the same time, through reasonable equipment layout and operation, it can effectively improve cleaning efficiency and shorten the construction period.

[0026] 3. This invention uses mechanical tools for cleaning, avoiding the high-altitude work required for manual cleaning and the high-temperature and high-pressure environment required for chemical cleaning, thus reducing the cleaning risks and ensuring worker safety;

[0027] 4. This invention uses mechanical tools for cleaning, which reduces the generation of wastewater and exhaust gas, and is beneficial to environmental protection. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the device for improving the cleaning efficiency of the decomposition tank provided in Embodiment 1 of the present invention;

[0030] Figure 2 This is a schematic diagram of the scraper disc and hinged rod of the device for improving the cleaning efficiency of the decomposition tank provided in Embodiment 1 of the present invention;

[0031] Figure 3 This is a schematic diagram of the scraper disc of the device for improving the cleaning efficiency of the decomposition tank provided in Embodiment 1 of the present invention;

[0032] Figure 4 This is a top view of the scraper disc of the device for improving the cleaning efficiency of the decomposition tank provided in Embodiment 3 of the present invention.

[0033] Figure 5 This is a schematic diagram of the top structure of the decomposition tank in the device for improving the cleaning efficiency of the decomposition tank provided in Embodiment 3 of the present invention.

[0034] Icons: 1. Decomposition tank; 2. Cover plate; 21. Circular groove; 22. Agitator; 23. First liquid level alarm point; 24. Second liquid level alarm point; 3. Manhole; 4. Cleaning pipeline; 5. Winch; 51. Moving pulley; 6. Rotary disc; 7. Scraper disc; 71. Scraper; 72. Scraper disc; 73. Hinge rod; 76. Scraper teeth; 8. Lifting rod; 9. Cleaning nozzle. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0037] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0038] In the description of this invention, it should be noted that if terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use, they are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0039] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0040] Example 1

[0041] An apparatus for improving the cleaning efficiency of a decomposition tank 1 includes a cleaning nozzle 9 for rinsing the inner wall of the decomposition tank 1, a rotating disk 6 that is raised and lowered, and a scraping disk 7 that is rotatably mounted on the rotating disk 6 for scraping material from the inner wall of the decomposition tank 1; the scraping disk 7 includes a hinge rod 73 for connecting the rotating disk 6 and a plurality of scrapers 71 that are rotatably mounted at an inclination α to the hinge rod 73; the hinge rod 73 is inclined at an inclination β to the horizontal plane, and the sum of α and β is 90 degrees; the cleaning nozzle 9 is mounted on the hinge rod 73.

[0042] In this embodiment, the decomposition tank 1 further includes a cover plate 2 for mounting the rotating disk 6 and a manhole 3 for scraping out scale.

[0043] In this embodiment, the cover plate 2 is further provided with a plurality of lifting rods 8 for lifting and lowering the rotating disk 6, and the hinge rod 73 is slidably connected to the edge of the rotating disk 6.

[0044] In this embodiment, the cover plate 2 is provided with an annular groove 21 for passing through the cleaning pipeline 4 and a stirrer 22 for stirring the decomposition tank 1; the cleaning pipeline 4 is connected to the cleaning nozzle 9; the rotating disk 6 is provided as an annular shape for passing through the stirrer 22.

[0045] Example 2

[0046] A method for improving the cleaning efficiency of the decomposition tank 1 using the aforementioned device includes the following steps:

[0047] S1: Unload the material from the decomposition tank 1 and open the manhole 3;

[0048] S2: Lower the rotating disk 6, adjust the tilt angle of the hinge rod 73 so that the scraper 71 abuts against the inner wall of the decomposition tank 1, open the cleaning nozzle 9, adjust the position of the scraper disk 7 and the cleaning nozzle 9, and thoroughly clean the inner wall of the decomposition tank 1.

[0049] S3: After cleaning the scabs near the manhole 3, use a small loader and a small excavator to enter the disassembly tank 1 for cleaning.

[0050] In this embodiment, in step S2, the rotation of the scraper disc 7 is achieved by the reaction force of the hinge rod 73 on the rotation of the rotating disc 6 and the horizontal direction of the cleaning nozzle 9, and the pressure of the cleaning nozzle 9 is 1500 bar.

[0051] In this embodiment, in step S2, the reaction force of the cleaning nozzle 9 also includes a vertical reaction force to press the scraper disc 7 downward against the inner wall of the decomposition tank 1.

[0052] Using this technical solution, while cleaning the decomposition tank 1 through the cleaning nozzle 9, a scraper disc 72 is set up. The scraper disc 72 rotates in close contact with the inner wall of the decomposition tank 1 in both the horizontal and vertical directions due to the reaction force of the high-pressure cleaning nozzle 9, scraping off the scale. In addition, following the habit of cleaning from top to bottom by rotating disc 6, the scale is first scraped by the lower scraper disc 72 and then cleaned by the upper cleaning nozzle 9, which effectively cleans and improves cleaning efficiency.

[0053] Since the decomposition tank 1 is relatively high, the pressure delivered by the high-pressure cleaning truck should not be divided into multiple streams for cleaning. Only one set of cleaning nozzles 9 is installed. With the lifting of the rotating plate 6 and the rotation of the hinge rod 73, the inner wall of the decomposition tank 1 can be rinsed in all directions, ensuring the rinsing pressure while ensuring thorough cleaning and high cleaning efficiency.

[0054] The structure is removed by first scraping and rinsing, and then the scraped scale is transported out of the decomposition tank 1 by opening the manhole and using a small excavator and a small loader. This method achieves the purpose of removing the structure by simple physical means, shortens the construction period, reduces cleaning costs, and reduces the risks of working at height.

[0055] Example 3

[0056] In this embodiment, the scraper 71 includes a scraper disc 72 rotatably mounted on the hinge rod 73 and scraper teeth 76 disposed on the edge of the scraper disc 72, wherein the edge surface of the scraper teeth 76 forms an angle of α degrees with the hinge rod 73.

[0057] In this embodiment, the cleaning nozzle 9 is rotatably mounted on the hinge rod 73 and forms an angle with the hinge rod 73 in the vertical direction.

[0058] In this embodiment, a winch 5 for lifting the cleaning pipeline 4 and a movable pulley 51 for suspending the cleaning pipeline 4 are also included.

[0059] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An apparatus for improving the cleaning efficiency of a decomposition tank, comprising a cleaning nozzle (9) for rinsing the inner wall of the decomposition tank (1), characterized in that: It also includes a rotating disk (6) with a lifting mechanism and a scraper disk (7) rotatably mounted on the rotating disk (6) for scraping the inner wall of the decomposition tank (1); the scraper disk (7) includes a hinge rod (73) for connecting the rotating disk (6) and several sets of scrapers (71) rotatably mounted and inclined at an angle α to the hinge rod (73); the hinge rod (73) is inclined at an angle β to the horizontal plane, and the sum of α and β is 90 degrees; the cleaning nozzle (9) is mounted on the hinge rod (73). The decomposition tank (1) also includes a cover plate (2) for mounting the rotating disk (6) and a manhole (3) for scraping out scale; the cover plate (2) is also provided with several sets of lifting rods (8) for lifting and lowering the rotating disk (6), and the edge of the rotating disk (6) is slidably connected to the hinge rod (73); the cover plate (2) is provided with an annular groove (21) for passing through the cleaning pipeline (4) and a stirrer (22) for stirring the decomposition tank (1); the cleaning pipeline (4) is connected to the cleaning nozzle (9); the rotating disk (6) is designed as an annular shape for passing through the stirrer (22).

2. The device for improving the cleaning efficiency of a decomposition tank according to claim 1, characterized in that: The scraper (71) includes a scraper disc (72) rotatably mounted on the hinge rod (73) and scraper teeth (76) located on the edge of the scraper disc (72), wherein the edge surface of the scraper teeth (76) forms an angle of α degrees with the hinge rod (73).

3. The device for improving the cleaning efficiency of a decomposition tank according to claim 1, characterized in that: The cleaning nozzle (9) is rotatably mounted on the hinge rod (73) and has an angle with the hinge rod (73) in the vertical direction.

4. The device for improving the cleaning efficiency of a decomposition tank according to claim 1, characterized in that: It also includes a winch (5) for lifting the cleaning pipeline (4) and a movable pulley (51) for suspending the cleaning pipeline (4).

5. A method for improving the cleaning efficiency of a decomposition tank using the apparatus according to any one of claims 1-4, characterized in that: Includes the following steps: S1: Unload the material from the decomposition tank (1) and open the manhole (3); S2: Lower the rotating disk (6), adjust the tilt angle of the hinge rod (73) so that the scraper (71) abuts against the inner wall of the decomposition tank (1), open the cleaning nozzle (9), adjust the position of the scraper disk (7) and the cleaning nozzle, and thoroughly clean the inner wall of the decomposition tank (1). S3: After cleaning the scabs near the manhole (3), use a small loader and a small excavator to enter the disassembly tank (1) for cleaning.

6. The method for improving the cleaning efficiency of a decomposition tank according to claim 5, characterized in that: In step S2, the rotation of the scraper disc (7) is achieved by the rotation of the rotating disc (6) by the hinge rod (73) and the reaction force of the cleaning nozzle (9) in the horizontal direction. The pressure of the cleaning nozzle (9) is 1400 bar-1600 bar.

7. The method for improving the cleaning efficiency of a decomposition tank according to claim 6, characterized in that: In step S2, the reaction force of the cleaning nozzle (9) also includes a vertical reaction force to press the scraper disc (7) down against the inner wall of the decomposition tank (1).

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