An automatic filter bag cleaning system for a granulation tower tail gas purification device

Abstract

This invention provides an automatic filter bag cleaning system for a granulation tower exhaust gas purification device, belonging to the field of granulation tower technology. It involves arranging water pipes inside the top of the cleaning chamber of the urea granulation tower purification device, with nozzles installed on the pipes. The nozzles spray a circular water mist; by deflecting the nozzles at a certain angle, the water can cover a specific area of ​​the filter bag. Water enters the filter bag through its opening, flows along its surface, and wets the bag. Material adhering to the outside of the filter bag dissolves upon contact with the water and automatically detaches. This invention solves the problem of urea dust trapped on the filter bag surface accumulating and affecting purification efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of granulation tower technology, specifically relating to an automatic filter bag cleaning system for a granulation tower tail gas purification device. Background Technology

[0002] Currently, urea is mainly used as an agricultural fertilizer, and it is primarily available on the market in granular form. Urea granulation mainly employs two methods: First, tower granulation, which uses a rotating granulation nozzle at the top of a granulation tower to spray molten urea into the tower. Cold air entering at the bottom of the tower cools the descending urea granules, which are then collected at the bottom and packaged for sale. Second, mechanical granulation (e.g., drum granulation, fluidized bed granulation), which atomizes urea and sprays it onto seed crystals, causing the crystals to grow continuously until they reach a millimeter size, at which point they are discharged from the equipment and packaged for sale.

[0003] Existing urea granulation towers utilize natural ventilation. Molten urea is sprayed through granulation nozzles and cooled by natural ventilation to form urea granules. The airflow velocity within the tower affects not only the particle settling speed but also the amount of urea dust emitted. Due to the chemical reaction process, nozzle spraying, and abnormal operating conditions, the exhaust gas from the top of the granulation tower contains a significant amount of dust, primarily CO(NH2)2, resulting in substantial loss of value and severe environmental pollution.

[0004] There are two types of dust recovery technologies for the top of urea granulation towers: dry and wet. Traditional wet dust collection technology involves installing a water-washing jet atomizing device at the top of the urea granulation tower to absorb or adsorb urea dust particles using water-based substances. However, it has an insurmountable technical drawback: a large number of urea dust particles "escape" from the top of the urea granulation tower and overflow into the atmosphere, forming pollutants similar to "smoke," causing secondary pollution to the surrounding environment. Dry dust recovery technology represents a significant technological breakthrough, overcoming the prejudice that "dry baghouse dust collectors are not applicable to urea granulation equipment." Dry dust recovery technology involves installing a dust recovery device at the top of the urea granulation tower, achieving near-zero emission urea dust recovery; it is a historic and innovative technology.

[0005] Currently, urea manufacturers are abandoning their original wet dust removal technology and opting for dry dust recovery technology. Dry dust recovery technology for urea granulation tail gas uses filter bags for dust collection. However, over time, the filter bags in the urea granulation tail gas purification device accumulate urea dust on their surface. After one working cycle, the filter bags require shutdown for cleaning and maintenance. This reduces production efficiency and time. Utility Model Content

[0006] Based on the problems existing in the prior art, this utility model provides an automatic filter bag cleaning system for a granulation tower tail gas purification device; this utility model solves the problem that urea dust trapped on the surface of the filter bag will accumulate on the surface of the filter bag and affect the purification efficiency.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: providing an automatic filter bag cleaning system for a granulation tower tail gas purification device. A spray pipe is arranged on the inner side of the top of the cleaning chamber of the urea granulation tower purification device. Nozzles are installed on the spray pipe. The water mist sprayed from the nozzles is circular. The water flow enters the filter bag from the filter bag opening, flows along the surface of the filter bag and wets the filter bag. The material adhering to the outside of the filter bag melts upon contact with water and automatically falls off. The nozzles are installed on the spray pipe, with the nozzles located in the middle of the filter bag area and offset 25° towards the center of the filter bag area.

[0008] Preferably, the spray pipe arranged inside the top of the urea granulation tower purification device is connected to the external water inlet pipe. One nozzle covers an area greater than 1 / 2 of the filter bag area, and the water jets from both sides can cover the entire filter bag area. A pneumatic ball valve is installed on the connecting pipe between the spray pipe arranged inside the top of the urea granulation tower purification device and the external water inlet pipe, and the opening and closing of the pneumatic ball valve is operated by a PLC.

[0009] Furthermore, the operating system of the granulation tower exhaust gas purification device shuts down the fan in the clean area and opens the pneumatic ball valve to automatically clean the filter bags. Spray pipes or water pipes are arranged on both sides of the filter bag area, 1 meter above the filter bag opening.

[0010] Furthermore, an automatic filter bag cleaning system for a granulation tower exhaust gas purification device includes a granulation tower body, a support frame fixedly connected to the upper end of the granulation tower body, a plurality of fans arranged on the upper surface of the support frame, the plurality of fans being evenly distributed on the surface of the support frame, a support frame fixedly connected to the upper surface of the granulation tower body, and a fixing frame fixedly connected to the bottom surface of the support frame.

[0011] Furthermore, a connecting frame is provided at the bottom of the fixed frame, and several filter bags are provided on the inner wall of the granulation tower. Each filter bag has a filter bag opening on its surface. A cleaning device is provided on the arc surface of the granulation tower purification device, and the cleaning device includes a water inlet pipe.

[0012] Preferably, the arc surface of the water inlet pipe slides through the arc surface of the granulation tower purification device. A control valve is fixedly connected to the bottom end of the water inlet pipe. A pneumatic ball valve is fixedly connected to the arc surface of the end of the water inlet pipe near the control valve. The pneumatic ball valve is located on the inner wall of the granulation tower. A spray pipe is fixedly connected to the end of the water inlet pipe away from the control valve. The spray pipe is located on both sides of the filter bag. The arc surface of the spray pipe is fixedly connected to the bottom end of the connecting frame. Several spray holes are opened on the arc surface of the inner wall of the spray pipe.

[0013] Preferably, a limiting component is provided on the arc surface of the spray pipe corresponding to the position of the spray hole. The limiting component includes a limiting plate, the inner wall of which abuts against the arc surface of the spray pipe. A connecting plate is rotatably connected to one end of the limiting plate. The same moving rod slides through the side of the connecting plate and the limiting plate that are close to each other. A first spring is sleeved on the arc surface of the moving rod. The two ends of the first spring are fixedly connected to the rotating plate and the moving rod, respectively. A coil spring is sleeved on the arc surface of the limiting plate away from the moving rod. Both ends of the coil spring are fixedly connected to the limiting plate. The arc surface of the coil spring slides through the inner wall of one end of the rotating plate. A nozzle is fixedly connected on the surface of the limiting plate corresponding to the position of the spray hole. The cross-sectional dimensions of the nozzle are adapted to the cross-sectional dimensions of the spray hole.

[0014] Preferably, the upper arc surface of the nozzle is fitted with a sealing ring, the cross-sectional dimensions of the sealing ring are adapted to the cross-sectional dimensions of the nozzle, and the sealing ring is a rubber ring.

[0015] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0016] 1. This utility model involves arranging spray pipes on the inner side of the top of the cleaning chamber of the granulation tower purification device. Nozzles are installed on the spray pipes, and the water mist sprayed from the nozzles is circular. By deflecting the nozzles at a certain angle, water can be sprayed to cover a certain area of ​​the filter bags. Water flows into the filter bags from the filter bag openings, flows along the surface of the filter bags, and wets the filter bags. The materials adhering to the outside of the filter bags dissolve in the water and fall off automatically, achieving the effect of cleaning the filter bags. The spray pipes arranged on the inner side are connected to the external water inlet pipe, and pneumatic ball valves are installed on the pipes. The opening and closing of the pneumatic ball valves are operated by PLC. When it is necessary to clean the filter bags in this area, the area fan is turned off and the pneumatic ball valve is opened through the operating system, so that the filter bags can be automatically cleaned.

[0017] 2. This utility model, by setting up a cleaning device, cleans the filter bags on the granulation tower. The use of the water inlet pipe and spray pipe on the granulation tower allows the pneumatic ball valve on the water inlet pipe to open and close, enabling the spray holes on the spray pipe to clean the inner wall of the filter bags. This facilitates the convenient removal of urea dust accumulated on the surface of the filter bags. When using the spray holes on the spray pipe to clean the filter bags, a limiting plate corresponding to the nozzle is used to better align and limit the nozzles and spray holes. The positioning plate and the rotating plate rotate and connect, thereby squeezing and limiting the spray holes on the spray pipe between the positioning plate and the rotating plate. This allows the nozzles on the positioning plate to align with the spray holes, with the two nozzles at a 50-degree angle, effectively covering and cleaning the filter bag area. The rotating plate and the positioning plate are then fixed and limited by a moving rod, facilitating the adjustment, replacement, and maintenance of the entire nozzle position. The sealing ring on the nozzle increases the sealing between the nozzle and the spray hole, thus preventing water leakage at the connection point between the nozzle and the spray hole.

[0018] 3. This utility model, by setting an adjustment device, facilitates the replacement and maintenance of the fixing frame and connecting frame during long-term use of the sprinkler pipe, thereby providing better protection for the entire sprinkler pipe. The positioning plate on the positioning frame abuts against the fixing frame, and the positioning rod on the positioning plate, with its second spring generating tension, compresses and limits the position of the positioning rod. The positioning rod then engages with the positioning hole on the fixing frame, facilitating convenient fixation and limitation between the fixing frame and the connecting frame. When the positioning plate abuts against the fixing frame and connecting frame, the protective pad on the positioning plate provides better protection and limitation between the fixing frame and the connecting frame. When the fixing frame and the connecting frame are joined, the locking block on the fixing frame and the locking groove on the connecting frame engage with each other, thus facilitating the fixation and limitation of the entire fixing frame and connecting frame.

[0019] 4. This utility model, by setting up an auxiliary device, provides better protection for the nozzles installed on the spray pipe during operation, thus preventing nozzle blockage and malfunction. The drive motor on the support frame moves the drive gear and drive rack, adjusting their positions. This causes the top plate on the drive rack to raise and lower the position of the extrusion plate, allowing the extrusion column on the extrusion plate to compress and limit the nozzle's interior, thus protecting the entire nozzle. To prevent displacement of the top plate during adjustment, a sliding rod on the top plate slides between itself and the connecting frame on the support frame, further limiting the top plate's position. The sealing frame on the extrusion plate provides even better compression protection for the nozzle, preventing damage from impacts. Attached Figure Description

[0020] Figure 1 This utility model provides a three-dimensional structural diagram of an automatic filter bag cleaning system for a granulation tower tail gas purification device.

[0021] Figure 2 This invention proposes an automatic filter bag cleaning system for a granulation tower tail gas purification device. Figure 1 A magnified structural diagram at point A;

[0022] Figure 3 This utility model provides a schematic diagram of the cleaning device part of the automatic filter bag cleaning system of a granulation tower tail gas purification device.

[0023] Figure 4 This utility model provides a schematic diagram of the cleaning device structure of the automatic filter bag cleaning system of a granulation tower tail gas purification device.

[0024] Figure 5 This utility model provides a schematic diagram of the limiting component structure of the automatic filter bag cleaning system of a granulation tower tail gas purification device.

[0025] Figure 6 This utility model provides a partial structural diagram of the limiting component of the automatic filter bag cleaning system of a granulation tower tail gas purification device.

[0026] Figure 7 This utility model provides a schematic diagram of the adjustment device structure of the automatic filter bag cleaning system of a granulation tower tail gas purification device.

[0027] Figure 8 This utility model provides a partial structural diagram of the adjustment device of the automatic filter bag cleaning system of a granulation tower tail gas purification device.

[0028] Figure 9 This utility model provides a schematic diagram of the disassembled structure of the adjustment device of the automatic filter bag cleaning system of the granulation tower tail gas purification device.

[0029] Figure 10 This utility model provides a schematic diagram of the auxiliary device structure of the automatic filter bag cleaning system of the granulation tower tail gas purification device.

[0030] Figure 11 This invention proposes an automatic filter bag cleaning system for a granulation tower tail gas purification device. Figure 10 A magnified structural diagram at point B;

[0031] Figure 12 This invention proposes an automatic filter bag cleaning system for a granulation tower tail gas purification device. Figure 10 A magnified structural diagram at point C;

[0032] Figure 13 This is a schematic diagram of the automatic filter bag cleaning system according to the present invention.

[0033] Legend: 1. Granulation tower body; 2. Support frame; 3. Fan; 4. Support frame; 5. Filter bag inlet; 6. Filter bag; 7. Fixing frame; 8. Connecting frame; 9. Cleaning device; 91. Water inlet pipe; 92. Control valve; 93. Pneumatic ball valve; 94. Spray pipe; 95. Spray hole; 96. Limiting assembly; 961. Limiting plate; 962. Rotating plate; 963. Nozzle; 964. Coil spring; 965. Moving rod; 966. First spring; 967. Sealing ring; 10. Adjusting device; 1001. Positioning frame; 1002. Positioning plate; 1003, Positioning rod; 1004, Second spring; 1005, Positioning hole; 1006, Protective pad; 1007, Torsion spring; 1008, Slot; 1009, Block; 1010, Connecting hole; 11, Auxiliary device; 1101, Drive rack; 1102, Drive gear; 1103, Drive motor; 1104, Fixing frame; 1105, Top plate; 1106, Extrusion plate; 1107, Sealing frame; 1108, Extrusion column; 1109, Sliding rod; 1110, Connecting frame; 1111, Rotating column. Detailed Implementation

[0034] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0035] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0036] This invention provides an automatic filter bag cleaning system for a granulation tower exhaust gas purification device. A spray pipe or water pipe is arranged inside the top of the cleaning chamber of the urea granulation tower purification device. Nozzles are installed on the spray pipe or water pipe, and the water mist sprayed from the nozzles is circular. By deflecting the nozzles at a certain angle, the water can cover a certain area of ​​the filter bags. Water enters the filter bags from the bag openings, flows along the surface of the filter bags, and wets them. Material adhering to the outside of the filter bags dissolves upon contact with water and automatically falls off, achieving the filter bag cleaning effect. The water pipe arranged inside the top of the cleaning chamber of the urea granulation tower purification device is connected to an external water inlet pipe. A pneumatic ball valve is installed on the connecting pipe between the water pipe arranged inside the top of the cleaning chamber of the urea granulation tower purification device and the external water inlet pipe. The opening and closing of the pneumatic ball valve is operated by a PLC. When it is necessary to clean the filter bags in this area, the operating system of the granulation tower exhaust gas purification device shuts down the fan in the cleaning area and opens the pneumatic ball valve, thus enabling automatic filter bag cleaning.

[0037] Furthermore, spray pipes or water pipes are arranged on both sides of the filter bag area, approximately 1 meter above the filter bag opening. Preferably, nozzles are installed on the spray pipes, positioned in the center of the filter bag area, offset at a 25° angle towards the center. Each nozzle covers more than half of the filter bag area, allowing the water jets from both sides to cover the entire area. Water enters the filter bag from the opening, flows down the bag, and wets it. Any material adhering to the outside of the filter bag dissolves upon contact with the water and detaches automatically, achieving the desired filter bag cleaning effect.

[0038] Furthermore, an automatic filter bag cleaning system for a granulation tower exhaust gas purification device includes a granulation tower body. A support frame is fixedly connected to the upper end of the granulation tower body. Several fans are arranged on the upper surface of the support frame, and the fans are evenly distributed on the surface of the support frame. A support frame is fixedly connected to the upper surface of the granulation tower body. A fixing frame is fixedly connected to the bottom surface of the support frame. A connecting frame is arranged at the bottom end of the fixing frame. Several filter bags are arranged on the inner wall of the granulation tower body. Each of the filter bags has a filter bag opening on its surface. A cleaning device is provided on the arc surface of the granulation tower body purification device, and the cleaning device includes a water inlet pipe.

[0039] By adopting the above technical solution, a spray pipe is arranged on the inner side of the top of the clean chamber of the granulation tower purification device, and nozzles are installed on the spray pipe. The water mist sprayed from the nozzles is circular. By deflecting the nozzles at a certain angle, water can be sprayed to cover a certain area of ​​the filter bags. The water flows into the filter bags from the filter bag opening, flows along the surface of the filter bags and wets them. The material adhering to the outside of the filter bags dissolves in the water and falls off automatically, achieving the effect of cleaning the filter bags. The spray pipe arranged on the inner side is connected to the external water inlet pipe, and a pneumatic ball valve is installed on the pipe. The opening and closing of the pneumatic ball valve is operated by PLC. When it is necessary to clean the filter bags in this area, the area fan is turned off and the pneumatic ball valve is opened through the operating system, so that the filter bags can be automatically cleaned.

[0040] Preferably, the arc surface of the water inlet pipe slides through the arc surface of the granulation tower purification device. A control valve is fixedly connected to the bottom end of the water inlet pipe. A pneumatic ball valve is fixedly connected to the arc surface of the end of the water inlet pipe near the control valve. The pneumatic ball valve is located on the inner wall of the granulation tower. A spray pipe is fixedly connected to the end of the water inlet pipe away from the control valve. The spray pipe is located on both sides of the filter bag. The arc surface of the spray pipe is fixedly connected to the bottom end of the connecting frame. A plurality of spray holes are opened on the arc surface of the inner wall of the spray pipe.

[0041] By adopting the above technical solution, when cleaning the filter bags on the granulation tower, the pneumatic ball valve on the water inlet pipe can be used to open and close the water inlet pipe through the use of the water inlet pipe and the spray holes opened on the spray pipe to clean the inner wall of the filter bag, which is conducive to conveniently cleaning the urea dust trapped and accumulated on the surface of the filter bag.

[0042] Preferably, the arc surface of the spray pipe is provided with a limiting component corresponding to the position of the spray hole. The limiting component includes a limiting plate, the inner wall of which abuts against the arc surface of the spray pipe. One end of the limiting plate is rotatably connected to a connecting plate. The connecting plate and the limiting plate are slidably connected to the same moving rod on their respective sides. The arc surface of the moving rod is fitted with a first spring, the two ends of which are fixedly connected to a rotating plate and the moving rod, respectively. The arc surface of the limiting plate away from the moving rod is fitted with a coil spring, both ends of which are fixedly connected to the limiting plate. The arc surface of the coil spring slidably penetrates the inner wall of one end of the rotating plate. A nozzle is fixedly connected to the surface of the limiting plate at the position corresponding to the spray hole. The cross-sectional dimensions of the nozzle are adapted to the cross-sectional dimensions of the spray hole.

[0043] This preferred solution achieves better alignment and positioning of the nozzles and spray holes on the spray pipe when cleaning the filter bags. A limiting plate, connected to the nozzle, rotates and aligns with a rotating plate, thus squeezing and positioning the spray holes on the spray pipe. This allows the nozzles on the limiting plate to align with the spray holes, with the two nozzles at a 50-degree angle, effectively covering and cleaning the filter bag area. A movable rod then connects and fixes the rotating plate and the limiting plate, facilitating adjustment, replacement, and maintenance of the entire nozzle position.

[0044] Preferably, the upper arc surface of the nozzle is fitted with a sealing ring, the cross-sectional dimensions of the sealing ring are adapted to the cross-sectional dimensions of the nozzle, and the sealing ring is a rubber ring.

[0045] By adopting this preferred solution, the sealing ring on the nozzle can increase the sealing between the nozzle and the spray hole, thereby helping to prevent water from leaking at the joint between the spray hole and the nozzle.

[0046] Preferably, the upper arc surface of the connecting frame is provided with an adjustment device, the adjustment device includes two positioning frames, and the ends of the two positioning frames that are far apart from each other are rotatably connected to positioning plates. Positioning rods are slidably passed through both sides of the upper end of the positioning plates. The arc surface of the positioning rods is fitted with a second spring, and the two ends of the second springs are fixedly connected to the positioning rods and the positioning plates, respectively. The bottom end of the fixing frame is provided with a positioning hole corresponding to the position of the positioning rod. The inner wall of the positioning hole is inserted into the arc surface of the positioning rod. The arc surface of the positioning frame is fitted with a torsion spring, and the two ends of the torsion spring are fixedly connected to the positioning frame. The bottom end of the positioning plate is provided with a connecting hole, and the arc surface of the torsion spring slides through the inner wall of the connecting hole.

[0047] By adopting the above technical solution, during long-term use of the sprinkler pipe, in order to facilitate better replacement and maintenance of the fixing frame and connecting frame, and thus better protect the entire sprinkler pipe, the positioning plate on the positioning frame of the connecting frame abuts against the fixing frame. Then, the positioning rod on the positioning plate uses the tension generated by the second spring on the positioning rod to compress and limit the position of the positioning rod. The positioning rod is inserted into the positioning hole opened on the fixing frame for limitation, which facilitates convenient fixation and limitation between the fixing frame and the connecting frame.

[0048] Preferably, protective pads are fixedly connected to the side of the positioning plate near the connecting frame, and the surfaces of the protective pads are fixedly connected to the bottom end of the fixing frame and the top end of the connecting frame, respectively.

[0049] By adopting this preferred solution, when the positioning plate abuts and limits the contact between the fixed frame and the connecting frame, the protective pad on the positioning plate can provide better protection and limitation between the fixed frame and the connecting frame.

[0050] Preferably, a slot is provided on the upper end of the connecting frame near the fixed frame, and a locking block is fixedly connected to the bottom end of the fixed frame at the position corresponding to the slot, and the inner wall of the slot engages with the arc surface of the locking block.

[0051] By adopting this preferred solution, when the fixed frame and the connecting frame are docked, the locking blocks on the fixed frame and the locking slots on the connecting frame can engage and limit each other, which is beneficial for fixing and limiting the entire fixed frame and the connecting frame.

[0052] Preferably, the inner walls at both ends of the support frame are provided with auxiliary devices. The auxiliary devices include two fixed frames, one side of each fixed frame is fixedly connected to both ends of the support frame, and a drive motor is fixedly connected to the inner wall of each fixed frame. A drive gear is fixedly connected to the output end of each drive motor, and a drive rack is meshed with the tooth surface of the drive gear. One side of each drive rack is fixedly connected to the support frame, and the upper ends of the two drive racks are fixedly connected to the same top plate. An extrusion plate is fixedly connected to the surface of the top plate at the position corresponding to the nozzle. Extrusion columns are fixedly connected to both ends of the extrusion plate at the positions corresponding to the nozzle, and the cross-sectional dimensions of the extrusion columns are adapted to the cross-sectional dimensions of the nozzle.

[0053] By adopting the above technical solution, when operating the nozzles installed on the spray pipe, in order to better protect the nozzles and avoid nozzle blockage that would prevent normal operation, the drive motor on the support frame drives the drive gear and drive rack to move and adjust their positions. This causes the top plate on the drive rack to move the position of the extrusion plate up and down, and the extrusion column on the extrusion plate to extrude and limit the inner wall of the nozzle, thus helping to protect the entire nozzle.

[0054] Preferably, a plurality of sliding rods are fixedly connected to both sides of the top plate, and a connecting frame is fixedly connected to the upper side wall of the support frame at the position corresponding to the sliding rod. The surface of the connecting frame slides through the arc surface of the sliding rod, and a rotating column is threaded to the upper end of each sliding rod.

[0055] By adopting this preferred solution, in order to prevent the position of the entire top plate from shifting when the position of the top plate is moved and adjusted, the sliding limit is achieved between the sliding rod on the top plate and the connecting frame on the support frame, which is beneficial to limiting the position of the entire top plate.

[0056] Preferably, a sealing frame is fixedly connected to the extrusion plate at the position corresponding to the extrusion column, and the cross-sectional dimension of the sealing frame is larger than the cross-sectional dimension of the nozzle.

[0057] By adopting this preferred solution, the sealing frame on the extrusion plate can better protect the entire nozzle area from impact damage.

[0058] The present invention will be further described below with reference to the accompanying drawings.

[0059] Specifically, such as Figure 13 As shown, the automatic filter bag cleaning system of the granulation tower tail gas purification device of this utility model includes a control valve 4, a main water inlet pipe 3, a spray flushing pipe 1, nozzles 2, and other auxiliary devices. The main water inlet pipe provides the necessary water for the entire cleaning system and is controlled by a valve. The main water inlet pipe extends upwards to the cleaning chamber at the top of the purification device, where it branches off to connect to the spray flushing pipes for different zones. The spray flushing pipes are installed inside the cleaning chamber, distributed on both sides of the filter bag area, approximately 1 meter above the filter bags. Multiple dedicated cleaning nozzles are installed on the spray flushing pipes, with the nozzles angled approximately 25 degrees towards the center of the filter bag area, ensuring that the water sprayed by the nozzles on both sides covers the entire filter bag area. Similarly, the spray flushing pipes also have control valves. When the filter bags in a certain area need cleaning, the valve on the main water inlet pipe opens, and the corresponding valve on the spray flushing pipe also opens. At this time, the nozzles on the spray flushing pipes spray water to wet and soak the covered filter bags. The material adhering to the surface of the filter bags absorbs the water, dissolves, and gradually peels off, achieving the cleaning effect.

[0060] Furthermore, such as Figures 1-12As shown, the automatic filter bag cleaning system of the granulation tower tail gas purification device of this utility model includes a granulation tower body 1, a support frame 2 fixedly connected to the upper end of the granulation tower body 1, a plurality of fans 3 arranged on the upper surface of the support frame 2, the plurality of fans 3 being evenly distributed on the surface of the support frame 2, a support frame 4 fixedly connected to the upper surface of the granulation tower body 1, a fixing frame 7 fixedly connected to the bottom surface of the support frame 4, a connecting frame 8 arranged at the bottom end of the fixing frame 7, a plurality of filter bags 6 arranged on the inner wall of the granulation tower body 1, a filter bag opening 5 opened on the surface of the plurality of filter bags 6, a cleaning device 9 arranged on the arc surface of the granulation tower body 1, an adjustment device 10 arranged on the upper arc surface of the connecting frame 8, and auxiliary devices 11 arranged on the inner walls of both ends of the support frame 4.

[0061] The specific setup and function of its cleaning device 9, adjusting device 10 and auxiliary device 11 will be described in detail below.

[0062] like Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, the cleaning device 9 includes a water inlet pipe 91, the arc surface of which slides through the arc surface of the granulation tower body 1. A control valve 92 is fixedly connected to the bottom end of the water inlet pipe 91. A pneumatic ball valve 93 is fixedly connected to the arc surface of the end of the water inlet pipe 91 near the control valve 92. The pneumatic ball valve 93 is located on the inner wall of the granulation tower body 1. A spray pipe 94 is fixedly connected to the end of the water inlet pipe 91 away from the control valve 92. The spray pipe 94 is located on both sides of the filter bag 6. The arc surface of the spray pipe 94 is fixedly connected to the bottom end of the connecting frame 8. Several spray holes 95 are opened on the arc surface of the inner wall of the spray pipe 94. A limiting component 96 is provided on the arc surface of the spray pipe 94 corresponding to the spray holes 95. The limiting component 96 includes a limiting plate 961. The inner wall of the limiting plate 961 abuts against the arc surface of the spray pipe 94. One end of the limiting plate 961 is rotatably connected to a connecting... A single moving rod 965 slides through the plate, connecting plate, and limiting plate 961 on their adjacent sides. A first spring 966 is fitted on the arc surface of the moving rod 965. The two ends of the first spring 966 are fixedly connected to the rotating plate 962 and the moving rod 965, respectively. A coil spring 964 is fitted on the arc surface of the limiting plate 961 away from the moving rod 965. Both ends of the coil spring 964 are fixedly connected to the limiting plate 961. The arc surface of the coil spring 964 slides through the inner wall of one end of the rotating plate 962. A nozzle 963 is fixedly connected to the surface of the limiting plate 961 at the position corresponding to the spray hole 95. The cross-sectional dimensions of the nozzle 963 are adapted to the cross-sectional dimensions of the spray hole 95. A sealing ring 967 is fitted on the upper arc surface of the nozzle 963. The cross-sectional dimensions of the sealing ring 967 are adapted to the cross-sectional dimensions of the nozzle 963. The sealing ring 967 is a rubber ring.

[0063] The cleaning device 9 achieves the following effect: by using a limiting plate 961 that is connected to the nozzle 963, the limiting plate 961 and the rotating plate 962 rotate and connect, thereby squeezing and limiting the spray holes 95 on the spray pipe 94 between the limiting plate 961 and the rotating plate 962, allowing the nozzle 963 on the limiting plate 961 to connect with the spray holes 95. The angle between the two nozzles 963 is 50 degrees, which can effectively cover and clean the area of ​​the filter bag 6. Then, the moving rod 965 is used to insert and fix the rotating plate 962 and the limiting plate 961, which is conducive to the adjustment, replacement and maintenance of the position of the nozzle 963. The sealing ring 967 on the nozzle 963 can increase the sealing between the nozzle 963 and the spray hole 95, thereby helping to prevent water from leaking at the connection between the spray hole 95 and the nozzle 963.

[0064] like Figure 7 , Figure 8 and Figure 9 As shown, the adjusting device 10 includes two positioning frames 1001. Positioning plates 1002 are rotatably connected to the ends of the two positioning frames 1001 that are far apart from each other. Positioning rods 1003 slide through both sides of the upper end of the positioning plates 1002. A second spring 1004 is sleeved on the arc surface of the positioning rod 1003. The two ends of the second spring 1004 are fixedly connected to the positioning rod 1003 and the positioning plate 1002, respectively. A positioning hole 1005 is opened at the bottom end of the fixing frame 7 corresponding to the position of the positioning rod 1003. The inner wall of the positioning hole 1005 is inserted into the arc surface of the positioning rod 1003. A torsion spring 1007 is sleeved on the arc surface of the positioning frame 1001. Both ends of the spring 1007 are fixedly connected to the positioning frame 1001. The bottom end of the positioning plate 1002 is provided with a connecting hole 1010. The arc surface of the torsion spring 1007 slides through the inner wall of the connecting hole 1010. The side of the positioning plate 1002 near the connecting frame 8 is fixedly connected with a protective pad 1006. The surface of the protective pad 1006 is fixedly connected to the bottom end of the fixing frame 7 and the top end of the connecting frame 8 respectively. The upper end of the connecting frame 8 is provided with a slot 1008 near the fixing frame 7. The bottom end of the fixing frame 7 is fixedly connected with a block 1009 corresponding to the position of the slot 1008. The inner wall of the slot 1008 engages with the arc surface of the block 1009.

[0065] The overall adjustment device 10 achieves the following effect: through the positioning frame 1001 on the connecting frame 8, the positioning plate 1002 on the positioning frame 1001 abuts against the fixed frame 7; then, using the positioning rod 1003 on the positioning plate 1002, the tension generated by the second spring 1004 on the positioning rod 1003 compresses and limits the position of the positioning rod 1003; and the positioning rod 1003 is inserted into and limited by the positioning hole 1005 opened on the fixed frame 7, which facilitates convenient adjustment of the fixed frame 7 and the fixed frame 7. The connecting frame 8 is fixed and limited. When the positioning plate 1002 abuts and limits the connection between the fixed frame 7 and the connecting frame 8, the protective pad 1006 on the positioning plate 1002 can better protect and limit the connection between the fixed frame 7 and the connecting frame 8. When the fixed frame 7 and the connecting frame 8 are connected, the locking block 1009 on the fixed frame 7 and the locking groove 1008 on the connecting frame 8 can lock and limit the connection, which is beneficial to the fixed and limited connection between the fixed frame 7 and the connecting frame 8.

[0066] like Figure 10 , Figure 11 and Figure 12 As shown, the auxiliary device 11 includes two fixed frames 1104. One side of each fixed frame 1104 is fixedly connected to both ends of the support frame 4. A drive motor 1103 is fixedly connected to the inner wall of each fixed frame 1104. A drive gear 1102 is fixedly connected to the output end of each drive motor 1103. The teeth of the drive gear 1102 mesh with a drive rack 1101. One side of each drive rack 1101 is fixedly connected to the support frame 4. The upper ends of the two drive racks 1101 are fixedly connected to the same top plate 1105. A pressing plate 1106 is fixedly connected to the surface of the top plate 1105 at a position corresponding to the nozzle 963. The two ends of the pressing plate 1106 are... A squeezing column 1108 is fixedly connected to the nozzle 963. The cross-sectional dimensions of the squeezing column 1108 are adapted to the cross-sectional dimensions of the nozzle 963. Several sliding rods 1109 are fixedly connected to both sides of the top plate 1105. A connecting frame 1110 is fixedly connected to the upper side wall of the support frame 4 at the position corresponding to the sliding rod 1109. The surface of the connecting frame 1110 slides through the arc surface of the sliding rod 1109. A rotating column 1111 is threadedly connected to the upper end of each sliding rod 1109. A sealing frame 1107 is fixedly connected to the squeezing plate 1106 at the position corresponding to the squeezing column 1108. The cross-sectional dimensions of the sealing frame 1107 are larger than the cross-sectional dimensions of the nozzle 963.

[0067] The auxiliary device 11 achieves the following effect: the drive motor 1103 on the support frame 4 drives the drive gear 1102 and drive rack 1101 to adjust their positions, thereby causing the top plate 1105 on the drive rack 1101 to raise and lower the position of the extrusion plate 1106. The extrusion column 1108 on the extrusion plate 1106 then extrudes and limits the inner wall of the nozzle 963, thus protecting the entire nozzle 963. When adjusting the position of the top plate 1105, to prevent the top plate 1105 from shifting, the sliding rod 1109 on the top plate 1105 slides and limits the position of the top plate 1105 with the connecting frame 1110 on the support frame 4. The sealing frame 1107 on the extrusion plate 1106 provides better protection against the extrusion of the nozzle 963, preventing damage from impacts.

[0068] Example 2, based on Example 1, has the following overall working principle: In this utility model, a spray pipe 94 is arranged inside the top of the cleaning chamber of the granulation tower purification device, and a nozzle 963 is installed on the spray pipe 94. The water mist sprayed by the nozzle 963 is circular. By deflecting the nozzle 963 at a certain angle to spray water, it can cover a certain area of ​​the filter bag. The water flows into the filter bag 6 from the filter bag opening 5, flows along the surface of the filter bag 6 and wets the filter bag 6. The material adhering to the outside of the filter bag 6 dissolves in the water and falls off automatically, achieving the filter bag cleaning effect. The spray pipe 94 arranged inside is connected to the external water inlet pipe 91. A pneumatic ball valve 93 is installed on the pipe. The opening and closing of the pneumatic ball valve 93 is operated by the PLC. When it is necessary to clean the filter bags in this area, the area fan 3 is turned off by the operating system and the pneumatic ball valve 93 is opened to automatically clean the filter bags.

[0069] When cleaning the filter bags 6 on the granulation tower 1, the pneumatic ball valve 93 on the inlet pipe 91 is used to open and close the inlet pipe 91 via the spray pipe 94. This allows the spray holes 95 on the spray pipe 94 to clean the inner wall of the filter bags 6, facilitating the removal of urea dust trapped and accumulated on the surface of the filter bags 6. When using the spray holes 95 on the spray pipe 94 to clean the filter bags 6, a limiting plate 961, which is connected to the nozzle 963, is used to better align and limit the nozzle 963 with the spray hole 95. This allows the limiting plate 961 to rotate and align with the rotating plate 962. This allows the limiting plate 961 and the rotating plate 962 to squeeze and limit the spray holes 95 on the spray pipe 94, allowing the nozzles 963 on the limiting plate 961 to align with the spray holes 95. The angle between the two nozzles 963 is 50 degrees, which can effectively cover and clean the area of ​​the filter bag 6. The moving rod 965 then inserts and fixes the rotating plate 962 and the limiting plate 961, which facilitates the adjustment, replacement, and maintenance of the entire nozzle 963 position. The sealing ring 967 on the nozzle 963 can increase the sealing between the nozzle 963 and the spray hole 95, thus helping to prevent water leakage at the joint between the spray hole 95 and the nozzle 963.

[0070] During prolonged use of the spray pipe 94, to facilitate easier replacement and maintenance of the fixing frame 7 and connecting frame 8, and thus better protect the entire spray pipe 94, the positioning plate 1002 on the positioning frame 1001 of the connecting frame 8 abuts against the fixing frame 7. Then, the positioning rod 1003 on the positioning plate 1002, with its second spring 1004, compresses and limits the position of the positioning rod 1003. The positioning rod 1003 and the opening on the fixing frame 7... The positioning hole 1005 is used for insertion and limiting, which facilitates the fixing and limiting of the fixed frame 7 and the connecting frame 8. When the positioning plate 1002 abuts and limits the connection between the fixed frame 7 and the connecting frame 8, the protective pad 1006 on the positioning plate 1002 can better protect and limit the connection between the fixed frame 7 and the connecting frame 8. When the fixed frame 7 and the connecting frame 8 are connected, the locking block 1009 on the fixed frame 7 and the locking groove 1008 on the connecting frame 8 can lock and limit each other, which is conducive to the fixing and limiting of the entire fixed frame 7 and the connecting frame 8.

[0071] When operating the nozzles 963 installed on the spray pipe 94, in order to better protect the nozzles 963 and avoid clogging and malfunction, the drive motor 1103 on the support frame 4 drives the drive gear 1102 and drive rack 1101 to adjust their positions. This causes the top plate 1105 on the drive rack 1101 to raise and lower the position of the extrusion plate 1106, allowing the extrusion column 1108 on the extrusion plate 1106 to press against the nozzles 963. The wall is squeezed and limited, which helps to protect the entire nozzle 963. When the position of the entire top plate 1105 is moved and adjusted, in order to prevent the position of the top plate 1105 from shifting, the sliding rod 1109 on the top plate 1105 and the connecting frame 1110 on the support frame 4 are slidably limited, which helps to limit the position of the entire top plate 1105. The sealing frame 1107 on the squeezing plate 1106 can better squeeze and protect the position of the entire nozzle 963, avoiding damage to the nozzle 963 from impacts.

[0072] Compared with existing technologies, the advantages and positive effects of the automatic filter bag cleaning system of the granulation tower tail gas purification device of this utility model are as follows:

[0073] 1. The automatic filter bag cleaning system of the granulation tower tail gas purification device of this utility model is provided by spray pipes arranged inside the top of the cleaning chamber of the granulation tower purification device. The spray pipes are equipped with nozzles, and the water mist sprayed from the nozzles is circular. By deflecting the nozzles at a certain angle, water can be sprayed to cover a certain area of ​​the filter bags. The water flows into the filter bags from the filter bag opening, flows along the surface of the filter bags and wets them. The material adhering to the outside of the filter bags dissolves and falls off automatically after encountering water, thus achieving the effect of cleaning the filter bags. The spray pipes arranged inside are connected to the external water inlet pipe. A pneumatic ball valve is installed on the pipe. The opening and closing of the pneumatic ball valve is operated by PLC. When it is necessary to clean the filter bags in this area, the area fan is turned off and the pneumatic ball valve is opened through the operating system, so that the filter bags can be automatically cleaned.

[0074] 2. The automatic filter bag cleaning system of the granulation tower exhaust gas purification device of this utility model, through the installation of a cleaning device, cleans the filter bags on the granulation tower body. This is achieved by using a pneumatic ball valve on the water inlet pipe to open and close the water inlet pipe, allowing the spray holes on the spray pipe to clean the inner wall of the filter bags. This facilitates the convenient removal of urea dust accumulated on the surface of the filter bags. When using the spray holes on the spray pipe to clean the filter bags, to better align and limit the nozzles and spray holes on the spray pipe, a [missing information - likely a device or mechanism] is used. The limiting plate and the rotating plate rotate and align, thereby squeezing and limiting the spray holes on the spray pipe. This allows the nozzles on the limiting plate to align with the spray holes, with the two nozzles at a 50-degree angle. This effectively covers and cleans the area of ​​the filter bag. The rotating plate and the limiting plate are then fixed and positioned by a moving rod, facilitating the adjustment, replacement, and maintenance of the entire nozzle position. The sealing ring on the nozzle increases the seal between the nozzle and the spray hole, thus preventing water leakage at the joint between the nozzle and the spray hole.

[0075] 3. The automatic filter bag cleaning system of the granulation tower tail gas purification device of this utility model, through the setting of an adjustment device, facilitates the replacement and maintenance of the fixed frame and connecting frame during long-term use of the spray pipe, thereby providing better protection for the entire spray pipe. At this time, the positioning plate on the positioning frame abuts against the fixed frame through the positioning frame, and the positioning rod on the positioning plate uses the tension generated by the second spring on the positioning rod to compress and limit the position of the positioning rod. The positioning rod is inserted into the positioning hole opened on the fixed frame for limiting, which facilitates convenient fixation and limitation between the fixed frame and the connecting frame. When the positioning plate abuts against the fixed frame and the connecting frame for limiting, the protective pad on the positioning plate can better protect and limit the fixation between the fixed frame and the connecting frame. When the fixed frame and the connecting frame are connected, the locking block on the fixed frame and the locking groove opened on the connecting frame can interlock and limit, thereby facilitating the fixation and limitation between the entire fixed frame and the connecting frame.

[0076] 4. The automatic filter bag cleaning system of the granulation tower tail gas purification device of this utility model, through the setting of auxiliary devices, provides better protection for the nozzles installed on the spray pipe when they are in use, thereby helping to avoid nozzle blockage and malfunction. At this time, the drive motor on the support frame drives the drive gear and drive rack to move and adjust their positions. This causes the top plate on the drive rack to move up and down the position of the extrusion plate, and the extrusion column on the extrusion plate to squeeze and limit the inside of the nozzle, thus helping to protect the entire nozzle. When the position of the entire top plate is moved and adjusted, in order to prevent the position of the top plate from shifting, the sliding rod on the top plate slides and the connecting frame on the support frame to limit the position of the entire top plate. The sealing frame on the extrusion plate can better protect the position of the entire nozzle from compression and prevent the nozzle from being damaged by impact.

[0077] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A filter bag automatic cleaning system for a prilling tower off-gas purification device, characterized by: The system has a spray pipe installed on the inner side of the top of the clean room of the urea granulation tower purification device. The spray pipe is equipped with nozzles. The water mist sprayed from the nozzles is circular. The water flows into the filter bag from the filter bag opening, flows along the surface of the filter bag and wets the filter bag. The material adhering to the outside of the filter bag melts when it comes into contact with water and falls off automatically. Install nozzles on the spray pipe, with the nozzles positioned in the middle of the filter bag area and offset 25° towards the center of the filter bag area. The automatic filter bag cleaning system of the granulation tower tail gas purification device includes a granulation tower body (1), and a cleaning device (9) is provided on the arc surface of the granulation tower body (1). The cleaning device (9) includes a water inlet pipe (91); a control valve (92) is fixedly connected to the bottom end of the water inlet pipe (91), and a pneumatic ball valve (93) is fixedly connected to the arc surface of the end of the water inlet pipe (91) near the control valve (92). The pneumatic ball valve (93) is located on the inner wall of the granulation tower body (1), and a spray pipe (94) is fixedly connected to the end of the water inlet pipe (91) away from the control valve (92). A limiting component (96) is provided on the arc surface of the spray pipe (94) corresponding to the position of the spray hole (95). The limiting component (96) includes a limiting plate (961). The inner wall of the limiting plate (961) abuts against the arc surface of the spray pipe (94). A connecting plate is rotatably connected to one end of the limiting plate (961). The same moving rod (965) slides through the side of the connecting plate and the limiting plate (961) that are close to each other. A first spring (966) is sleeved on the arc surface of the moving rod (965). The two ends of the first spring (966) are respectively connected to... The rotating plate (962) and the moving rod (965) are fixedly connected. A coil spring (964) is sleeved on the arc surface of the limiting plate (961) away from the moving rod (965). Both ends of the coil spring (964) are fixedly connected to the limiting plate (961). The arc surface of the coil spring (964) slides through the inner wall of one end of the rotating plate (962). A nozzle (963) is fixedly connected to the surface of the limiting plate (961) at the position corresponding to the spray hole (95). The cross-sectional dimensions of the nozzle (963) are adapted to the cross-sectional dimensions of the spray hole (95).

2. The filter bag automatic cleaning system of a prilling tower tail gas purification device according to claim 1, characterized in that: The spray pipes arranged on the inner side of the top of the clean chamber of the urea granulation tower purification device are connected to the external water inlet pipe. One nozzle covers an area greater than 1 / 2 of the filter bag area, and the water jets from both sides can cover the entire filter bag area.

3. The automatic cleaning system of the filter bag of the exhaust gas purification device of the prilling tower according to claim 2, characterized in that: A pneumatic ball valve is installed on the connecting pipe between the spray pipe arranged inside the top of the urea granulation tower purification device and the external water inlet pipe. The opening and closing of the pneumatic ball valve is operated by a PLC.

4. The automatic cleaning system of the filter bag of the exhaust gas purification device of the prilling tower according to claim 3, characterized in that: The operating system of the granulation tower exhaust gas purification device shuts down the fan in the clean area and opens the pneumatic ball valve to automatically clean the filter bags.

5. The automatic cleaning system of the filter bag of the exhaust gas purification device of the prilling tower according to claim 4, characterized in that: Spray pipes or water pipes are arranged on both sides of the filter bag area, 1 meter above the filter bag opening.

6. The automatic cleaning system of the filter bag of the exhaust gas purification device of the prilling tower according to claim 1, characterized in that: The upper end of the granulation tower body (1) is fixedly connected to a bearing frame (2), and a number of fans (3) are provided on the upper surface of the bearing frame (2). The fans (3) are evenly distributed on the surface of the bearing frame (2). The upper surface of the granulation tower body (1) is fixedly connected to a support frame (4), and the bottom surface of the support frame (4) is fixedly connected to a fixing frame (7).

7. The system according to claim 6, wherein the system further comprises a cleaning device. A connecting frame (8) is provided at the bottom of the fixed frame (7), and several filter bags (6) are provided on the inner wall of the granulation tower body (1). The surface of each filter bag (6) is provided with a filter bag opening (5).

8. The automatic cleaning system of the filter bag of the exhaust gas purification device of the prilling tower according to claim 7, characterized in that: The arc surface of the water inlet pipe (91) slides through the arc surface of the granulation tower body (1). The spray pipe (94) is located on both sides of the filter bag (6). The arc surface of the spray pipe (94) is fixedly connected to the bottom end of the connecting frame (8). Several spray holes (95) are opened on the arc surface of the inner wall of the spray pipe (94).

9. The automatic cleaning system of the filter bag of the exhaust gas purification device of the prilling tower according to claim 8, characterized in that: The upper arc surface of the nozzle (963) is fitted with a sealing ring (967). The cross-sectional dimensions of the sealing ring (967) are matched with the cross-sectional dimensions of the nozzle (963). The sealing ring (967) is a rubber ring.

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