Automatic ash removal equipment for SCR (Selective Catalytic Reduction) denitration reaction tower
By providing automatic ash cleaning equipment in the SCR denitrification reaction tower, using movable trolleys and high-pressure gas-purged ash cleaning pipeline components, the problems of limited manual operation space and major health hazards during the catalyst ash cleaning process are solved, and a safer and more efficient catalyst ash cleaning effect is achieved.
Patent Information
- Application Number
- CN202510460756.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-14
- Publication Date
- 2025-06-20
AI Technical Summary
The existing SCR denitrification reaction towers have problems such as limited operating space for manual cleaning and heavy health hazards in the catalyst cleaning process.
An automatic dust cleaning equipment for SCR denitrification reaction tower is provided, including a movable car and a dust cleaning pipe assembly detachably mounted on the movable car. The cleaning pipe assembly consists of a main pipe, a connecting pipe, an interface pipe and multiple nozzle pipes. The catalyst blockage is automatically cleaned by high-pressure gas purging.
It reduces the time for personnel to operate in limited space, protects the physical and mental health of personnel, reduces the artificial trampling and damage to the catalyst, and ensures the stable operation of the SCR denitrification system.
Smart Images
Figure CN120169150A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of cement production and processing, and particularly to an automatic ash cleaning equipment for an SCR denitration reaction tower. Background Art
[0002] At present, to adapt to the new situation of the development of the cement industry, SCR denitration has been widely applied at home and abroad. The existing high-temperature and high-dust SCR denitration system for cement kilns has been widely promoted in domestic cement factories, and can fully meet the highest standards of ultra-low emissions in the cement industry, and has made beneficial explorations for the practical application of domestic, low-cost, and high-efficiency ultra-low emissions in the cement industry.
[0003] However, in the actual production process, catalyst blockage may occur. During equipment maintenance, it is required that the through-hole rate of the catalyst be cleaned to 95% to be qualified. The ash cleaning effect of the catalyst is reflected in the through-hole rate of the catalyst pores. Excessive blockage will lead to too high system differential pressure, which not only affects the catalytic efficiency, but also indirectly increases the power consumption of the kiln system and reduces the ammonia water utilization rate. Therefore, sufficient attention should be paid to the catalyst ash cleaning work.
[0004] The existing equipment and materials used in the catalyst ash cleaning method include clean and dry compressed air, DN20 hoses matching the compressed air pipelines, several steel drills with a diameter of 6 mm and a length of 1.5 m, several sets of wearable all-round dust-proof equipment (dust-proof clothes, protective glasses, dust masks, positive pressure respirators, sandblasting and rust removal dust caps, etc.), and several pieces of rainproof cloth. The specific working steps are as follows:
[0005] 1. The safety supervisor monitors whether the gas in the reaction tower meets the safety requirements, and the staff entering the tower signs and confirms according to the requirements of the closed operation control ticket. First, the technical personnel enter the tower to take pictures of the dust distribution on each layer and the ash hanging on the shell (see Figure 1 and Figure 2 ) to analyze and judge the cause of ash accumulation;
[0006] 2. The operators manually clean the piled-up floating ash on the upper surface of the working layer, and then hold the compressed air hose and use clean compressed air to clean the floating ash on the upper surface of the working layer, the ash hanging on the tower wall and the hanger in all directions until the surface is observed to have no floating ash by the personnel, which is considered qualified;
[0007] 3. Lay rainproof cloth on the surface of the catalyst in the non-working layer to prevent the dust falling from the upper layer from accumulating in the non-working layer;
[0008] 4. The operators hold the compressed air hose and use clean compressed air to clean the ash hanging on the bottom of the working layer in all directions until all the catalyst support flat steels and bolts have no raw meal powder, which is considered qualified;
[0009] 5. The operator holds a compressed air hose and uses clean compressed air to vertically clean the ash accumulated in the catalyst holes of the working layer upward. It is required that the air pipe is vertical and the moving speed of the air pipe is slow.
[0010] For other layers, operate according to 4 and 5. Repeat the operation of 5 multiple times. It is qualified when the on-site inspection shows that the through-hole rate reaches more than 90%. For the still existing plugging phenomenon, manual guiding holes for the catalyst with a steel drill rod by manual method is needed, and then repeat 5 until the through-hole rate is greater than 95%, which is regarded as the qualified catalyst hole cleaning work (see Figure 3 ).
[0011] In the above process, when the personnel are cleaning in a confined space, the manual plugging removal is rather cumbersome and the dust amount is large, which seriously endangers the physical and mental health of the workers. Summary of the Invention
[0012] The purpose of the present invention is to overcome the problems existing in the prior art that the manual plugging removal operation space in the SCR denitration reaction tower is limited and the harm to personnel health is great, and to provide an automatic ash cleaning equipment for the SCR denitration reaction tower. The automatic ash cleaning equipment for the SCR denitration reaction tower has a simple structure, is convenient to operate, shortens the working time of personnel in the confined space, protects the physical and mental health of personnel, reduces the artificial trampling damage to the catalyst, and ensures the stable operation of the SCR denitration system.
[0013] To achieve the above purpose, the present invention provides an automatic ash cleaning equipment for the SCR denitration reaction tower. The automatic ash cleaning equipment for the SCR denitration reaction tower includes a movable trolley and an ash cleaning pipe assembly detachably installed on the movable trolley. The movable trolley is arranged to be able to drive the ash cleaning pipe assembly to move in the catalyst blockage area in the reaction tower. Among them, the ash cleaning pipe assembly includes a main pipe. Both ends of the main pipe are sealed. A connecting pipe and an interface pipe are formed on the side wall of the main pipe. The connecting pipe is detachably connected to the movable trolley, and the interface pipe is detachably connected to the purging gas source through a plastic hose. A plurality of nozzle pipes are formed on the top of the main pipe for purging at the catalyst blockage.
[0014] Preferably, a self-cleaning pipe connection pipe is further provided on the side wall of the main pipe and is arranged to be able to be connected to the self-cleaning pipe to ensure positive pressure in the area covered by the movable trolley.
[0015] Preferably, both ends of the main pipe are blocked by plugs.
[0016] Preferably, a plurality of nozzle pipes are arranged in a straight line from one end of the main pipe to the other end.
[0017] Preferably, a plurality of nozzle pipes are arranged in an S-shaped curve from one end of the main pipe to the other end.
[0018] Preferably, internal threads are formed on the nozzle pipes for detachably connecting with the external threads on the extension copper pipes.
[0019] Preferably, an external thread is formed on the connecting pipe, and an internal thread capable of being connected to the external thread is formed on the movable trolley.
[0020] Preferably, the SCR denitration reaction tower automatic ash cleaning equipment further includes a track arranged in the reaction tower.
[0021] Preferably, the track is arranged on the operation layer, on the tower wall, and on the hanging bracket.
[0022] Preferably, the wheels of the movable trolley are rollably embedded in the track.
[0023] According to the above technical solution, the ash cleaning pipeline assembly is composed of a main pipe, a connecting pipe, an interface pipe, and a plurality of nozzle pipes. During use, the interface pipe is connected to the purging gas source through a plastic hose. Since both ends of the main pipe are sealed, the purging gas source transports the gas into the main pipe for storage and compression, and then the high-pressure gas is extruded and ejected through a plurality of nozzle pipes arranged at the top of the main pipe. At the same time, the connecting pipe is connected to the movable trolley, so that the entire ash cleaning pipeline assembly is fixed to the movable trolley and moves with the movable trolley to the catalyst blockage area in the reaction tower, and purges the high-pressure gas towards the catalyst blockage for targeted ash cleaning operation. In this way, through the automatic ash cleaning by the automatic ash cleaning trolley in the reaction tower, the operation time of personnel in the confined space can be reduced, the national occupational health requirements can be met, the impact of dust on personnel health can be reduced, and the artificial trampling damage to the catalyst can also be reduced, ensuring the stable operation of the SCR denitration system. Description of the Drawings
[0024] Figure 1 is a schematic diagram of the on-site catalyst pore blockage in the reaction tower;
[0025] Figure 2 is a schematic diagram of the ash hanging at the bottom of the catalyst in the reaction tower;
[0026] Figure 3 is a schematic diagram of the catalyst after qualified ash cleaning;
[0027] Figure 4 is a schematic structural diagram of the ash cleaning pipeline assembly in the SCR denitration reaction tower automatic ash cleaning equipment according to an embodiment provided by the present invention.
[0028] Description of the Reference Numerals
[0029] 1 - Ash cleaning pipeline assembly 11 - Main pipe
[0030] 12 - Connecting pipe 13 - Interface pipe
[0031] 14 - Nozzle pipe 15 - Self-cleaning pipeline connection
[0032] 16 - Plug Specific Embodiments
[0033] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for the purpose of illustrating and explaining the present invention, and are not intended to limit the present invention.
[0034] In the present invention, unless otherwise specified, the directional terms such as "both ends, top, middle, side, inner, outer" included in the terms only represent the orientation of the terms in the normal use state, or the common names understood by those skilled in the art, and should not be regarded as a limitation of the terms.
[0035] Refer to Figure 4 , the present invention provides an automatic ash cleaning equipment for an SCR denitration reaction tower. The automatic ash cleaning equipment for the SCR denitration reaction tower includes a movable trolley and an ash cleaning pipe assembly 1 detachably installed on the movable trolley. The movable trolley is arranged to be able to drive the ash cleaning pipe assembly 1 to move in the catalyst blockage area in the reaction tower. Among them, the ash cleaning pipe assembly 1 includes a main pipe 11. Both ends of the main pipe 11 are sealed. A connecting pipe 12 and an interface pipe 13 are formed on the side wall of the main pipe 11. The connecting pipe 12 is detachably connected to the movable trolley, and the interface pipe 13 is detachably connected to the purging gas source through a plastic hose. A plurality of nozzle pipes 14 are formed on the top of the main pipe 11 for purging the catalyst blockage.
[0036] Through the above technical solution, the ash cleaning pipe assembly is composed of the main pipe 11, the connecting pipe 12, the interface pipe 13 and a plurality of nozzle pipes 14. During use, the interface pipe 13 is connected to the purging gas source through a plastic hose. Since both ends of the main pipe 11 are sealed, the purging gas source transports the gas into the main pipe 11 for storage and compression, and then the gas is extruded and ejected by a plurality of nozzle pipes 14 arranged on the top of the main pipe 11 to form high-pressure gas. At the same time, the connecting pipe 12 is connected to the movable trolley, so that the entire ash cleaning pipe assembly is fixed to the movable trolley and moves with the movable trolley to the catalyst blockage area in the reaction tower to purge high-pressure gas towards the catalyst blockage for targeted ash cleaning operation. In this way, by automatically cleaning the ash in the reaction tower with the automatic ash cleaning trolley, the operation time of personnel in the confined space can be reduced, the national occupational health requirements can be met, the impact of dust on the health of personnel can be reduced, and the artificial trampling damage to the catalyst can also be reduced, ensuring the stable operation of the SCR denitration system.
[0037] During the process of automatic cleaning of the SCR denitrification reaction tower using the automatic cleaning equipment, the area covered by the movable cart is filled with a large amount of dust that has fallen off and is raised in the air. Once it falls to the area covered by the movable cart and accumulates, it will affect the normal movement of the movable cart, thereby hindering the normal operation of automatic cleaning. Severe accumulation requires re-cleaning, which greatly delays the efficiency of the cleaning work. In order to avoid the above situation, it is preferred that a self-cleaning pipe connection 15 is provided on the side wall of the main pipe 11 and is configured to be connected to the self-cleaning pipe. The cleaning ability of the self-cleaning pipe can ensure the positive pressure state of the area covered by the movable cart, effectively prevent dust accumulation, and the movable cart can move back and forth smoothly and efficiently.
[0038] When the automatic dust cleaning equipment of the SCR denitration reaction tower is used in a dusty environment for a long time, it is inevitable that some dust will remain in the main pipe 11. If the dust is not cleaned regularly, it will accumulate and affect the airflow in the main pipe 11, resulting in blocked airflow. The dust removal effect of the multiple nozzle tubes 14 will be greatly reduced. Therefore, in order to facilitate the regular cleaning of the dust remaining in the main pipe 11, it is preferred to seal the two ends of the main pipe 11 with plugs 16. In this way, after a period of dust cleaning operation, the plugs 16 at both ends of the main pipe 11 can be removed, so that the main pipe 11 forms a transparent structure. At this time, the dust accumulated inside the main pipe 11 can be easily cleaned by passing high-pressure gas. After the maintenance is completed, the plugs 16 at both ends can be reinserted to restore the sealing state of the main pipe 11 during the dust cleaning process, which is convenient and quick to operate.
[0039] In one embodiment, in order to enable the automatic cleaning equipment of the SCR denitration reaction tower to perform centralized cleaning operations toward an area, preferably, a plurality of nozzle pipes 14 are arranged along a straight line from one end of the main pipe 11 to the other end.
[0040] In another embodiment, in order to expand the cleaning area of the SCR denitration reaction tower automatic cleaning equipment so that the catalyst blocked area can be quickly cleaned and unblocked, multiple nozzle pipes 14 are preferably arranged along an S-shaped curve from one end of the main pipe 11 to the other end.
[0041] In addition, when using the above nozzle tube 14 for dust cleaning operation, if the dust cleaning area is large or the distance from the movable trolley is far, it will lead to poor cleaning effect of the nozzle tube 14, low dust cleaning efficiency, and waste of energy in vain. To solve the above problems, it is preferred that an internal thread is formed on the nozzle tube 14 for detachably connecting with the external thread on the extension copper tube. In this way, the extension copper tube can be easily and conveniently installed on the SCR denitration reaction tower automatic dust cleaning equipment through the threaded connection between the internal thread and the external thread, shortening the distance between the nozzle tube 14 and the area to be dust cleaned, and optimizing the dust cleaning effect. Similarly, after the dust cleaning operation is completed, the extension copper tube can be detached by rotating the threaded connection in the reverse direction, reducing the occupied space of the SCR denitration reaction tower automatic dust cleaning equipment and facilitating its storage after use.
[0042] In this embodiment, the detachable connection between the connecting tube 12 and the movable trolley can be any common connection structure in the art that can achieve quick disassembly and assembly. However, from the perspectives of simplifying the operation, facilitating material selection, and saving costs, it is preferred that an external thread is formed on the connecting tube 12, and an internal thread capable of connecting with the external thread is formed on the movable trolley. In this way, through the detachable connection between the internal thread and the external thread, after the dust cleaning operation is completed, the SCR denitration reaction tower automatic dust cleaning equipment can be disassembled into smaller unit structures for storage, further reducing the occupied space and facilitating storage.
[0043] When actually using the SCR denitration reaction tower automatic dust cleaning equipment for dust cleaning operation, in order to facilitate the advance planning and presetting of the moving area of the movable trolley in the reaction tower according to the dust cleaning requirements, and to avoid the easy deviation of the moving direction of the movable trolley during operation, which may affect the dust cleaning effect, it is preferred that the SCR denitration reaction tower automatic dust cleaning equipment further includes a track arranged in the reaction tower.
[0044] Furthermore, in order to enable the SCR denitration reaction tower automatic dust cleaning equipment to perform a more comprehensive and hierarchical dust cleaning operation, it is preferred that the above track is arranged on the operation layer, on the tower wall, and on the hanger. In this way, the movable trolley can traverse all possible blocked areas, and the qualified condition that the through-hole rate of the catalyst reaches 95% can be achieved with one operation.
[0045] Even further, when the movable trolley passes through the turning area or the area with large undulations on the above track, an accidental situation of the movable trolley derailing or even overturning is likely to occur. At this time, manual adjustment and installation will waste a lot of precious production time. Therefore, to avoid the above situation, it is preferred that the wheels of the movable trolley are rollably embedded in the track. By adopting this embedded and movable connection method, the derailment of the movable trolley can be effectively prevented, enabling it to always move within the preset track and continuously perform efficient dust cleaning operations.
[0046] The preferred embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited thereto. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, including the combination of each specific technical feature in any suitable manner. To avoid unnecessary repetition, the present invention will not separately describe various possible combination manners. However, these simple modifications and combinations should also be regarded as the content disclosed by the present invention and fall within the protection scope of the present invention.
Claims
1. An automatic cleaning equipment for SCR denitration reaction tower, characterized in that: The automatic cleaning equipment for the SCR denitration reaction tower comprises a movable trolley and a cleaning pipe assembly (1) detachably mounted on the movable trolley, wherein the movable trolley is configured to be able to drive the cleaning pipe assembly (1) to move in a catalyst blockage area in the reaction tower; wherein the cleaning pipe assembly (1) comprises a main pipe (11), both ends of the main pipe (11) are sealed, a connecting pipe (12) and an interface pipe (13) are formed on the side wall of the main pipe (11), the connecting pipe (12) is detachably connected to the movable trolley, and the interface pipe (13) is detachably connected to a purge gas source via a plastic hose; a plurality of nozzle pipes (14) are formed on the top of the main pipe (11) for purging the catalyst blockage area.
2. The automatic cleaning equipment for the SCR denitration reaction tower according to claim 1 is characterized in that: A self-cleaning pipe connecting pipe (15) is also provided on the side wall of the main pipe (11) and is configured to be connected to the self-cleaning pipe to ensure positive pressure in the area covered by the movable trolley.
3. The automatic cleaning equipment for the SCR denitration reaction tower according to claim 1 is characterized in that: Both ends of the main pipe (11) are blocked by plugs (16).
4. The automatic cleaning equipment for the SCR denitration reaction tower according to claim 1 is characterized in that: The plurality of nozzle tubes (14) are arranged in a straight line from one end of the main tube (11) to the other end.
5. The automatic cleaning equipment for the SCR denitration reaction tower according to claim 1 is characterized in that: The plurality of nozzle tubes (14) are arranged along an S-shaped curve from one end of the main tube (11) to the other end.
6. The automatic cleaning equipment for the SCR denitration reaction tower according to claim 4 or 5, characterized in that: The nozzle tube (14) is formed with an internal thread for matching with the external thread on the extended copper tube for detachable connection.
7. The automatic cleaning equipment for the SCR denitration reaction tower according to claim 1 is characterized in that: The connecting pipe (12) is formed with an external thread, and the movable trolley is formed with an internal thread that can be connected to the external thread.
8. The automatic dust cleaning equipment for the SCR denitration reaction tower according to claim 1 is characterized in that: The SCR denitration reaction tower automatic dust cleaning equipment also includes a track arranged in the reaction tower.
9. The automatic dust cleaning equipment for the SCR denitration reaction tower according to claim 8, characterized in that: The track is arranged on the working layer, the tower wall and the hanger.
10. The automatic dust cleaning equipment for the SCR denitration reaction tower according to claim 9, characterized in that: The wheels of the movable trolley are rotatably embedded in the track.