Automatic cleaning system for filter bag of prilling tower tail gas purification device

Abstract

The application provides a filter bag automatic cleaning system of a prilling tower tail gas purification device, belongs to the technical field of prilling towers, and is characterized in that a water pipe is arranged on the inner side of the top of a cleaning chamber of a urea prilling tower purification device, a nozzle is installed on the water pipe, the water mist sprayed by the nozzle is circular, the nozzle sprays water at a certain angle to cover a certain area of filter bags, water flows into the filter bags from the filter bag openings, flows along the filter bag surfaces and infiltrates the filter bags, and the materials adhered to the outer part of the filter bags are automatically dropped after being melted by water. The application solves the problem that urea dust intercepted on the surface of the filter bags is accumulated on the surface of the filter bags to affect the purification efficiency.

Description

Technical Field

[0001] This invention 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 in the purification unit to recover dust. However, over time, the filter bags in the urea granulation tail gas purification unit 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. Summary of the Invention

[0006] Based on the problems existing in the prior art, the present invention provides an automatic cleaning system for filter bags of a granulation tower tail gas purification device; the present invention 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. According to a first aspect of the technical solution of the present invention, an automatic filter bag cleaning system for a granulation tower tail gas purification device is provided. A water pipe is arranged inside the top of the cleaning chamber of the urea granulation tower purification device. Nozzles are installed on the water pipes, and the water mist sprayed from the nozzles is circular. By deflecting the nozzles at a certain angle, the water spray can cover a certain area of ​​the filter bag. Water flows into the filter bag from the bag opening, flows along the surface of the filter bag, and wets the filter bag. Material adhering to the outside of the filter bag dissolves upon contact with water and automatically falls off.

[0008] The water pipe arranged inside the top of the urea granulation tower purification device is connected to the external water inlet pipe. Preferably, a pneumatic ball valve is installed on the connecting pipe between the water 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] Preferably, 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 for automatic filter bag cleaning. Preferably, spray pipes or water pipes are arranged on both sides of the filter bag area, at a height of about 1 meter from the filter bag opening.

[0010] More preferably, 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; 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.

[0011] According to a second aspect of the present invention, an automatic filter bag cleaning system for a granulation tower exhaust gas purification device is provided. The system includes a granulation tower body, a support frame fixedly connected to the upper end of the granulation tower body, a plurality of fans evenly distributed on the surface of the support frame, a support frame fixedly connected to the upper surface of the granulation tower body, a fixing frame fixedly connected to the bottom surface of the support frame, a connecting frame at the bottom end of the fixing frame, a plurality of filter bags for purification devices arranged on the inner wall of the granulation tower body, each filter bag having a filter bag opening on its surface, and a cleaning device including a water inlet pipe on the arc surface of the purification device of the granulation tower body.

[0012] Preferably, the arc surface of the water inlet pipe slides through the arc surface of the 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 of the purification device, the arc surface of the spray pipe is fixedly connected to the bottom end of the connecting frame, and a plurality of spray holes are opened on the arc surface of the inner wall of the spray pipe.

[0013] 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.

[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 the present invention are as follows:

[0016] 1. This invention involves arranging spray pipes inside the top of the cleaning chamber of a purification device in a nozzle granulation tower. Nozzles are installed on these spray pipes, and the water mist sprayed from the nozzles is circular. By deflecting the nozzles at a certain angle, the water can cover a specific area of ​​the filter bags. Water flows into the filter bags of the purification device from the filter bag openings, flowing along the surface of the filter bags and wetting 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 inner spray pipes are connected to an external water inlet pipe, and pneumatic ball valves are installed on the pipes. The opening and closing of the pneumatic ball valves is controlled by a PLC. When it is necessary to clean the filter bags in a specific area, the area fan is turned off and the pneumatic ball valve is opened via the operating system, allowing for automatic filter bag cleaning.

[0017] 2. This invention, by setting up a cleaning device, cleans the filter bags of the purification device on the granulation tower. The use of the inlet pipe and spray pipe on the granulation tower allows the pneumatic ball valve on the 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 cleaning 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 to [missing information - likely a device or mechanism]. The limiting plate rotates and aligns with the rotating plate, 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 filter bag area of ​​the purification device. 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 sealing between the nozzle and the spray hole, thus preventing water leakage at the joint between the nozzle and the spray hole.

[0018] 3. This invention, by setting an adjustment device, facilitates the replacement and maintenance of the fixing frame and connecting frame during long-term use of the spray pipe, thereby providing better protection for the entire spray 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 invention, 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 protection against compression and impact damage to the nozzle. Attached Figure Description

[0020] Figure 1 This invention provides a three-dimensional structural schematic 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 invention provides a schematic diagram of the cleaning device portion of the automatic filter bag cleaning system for a granulation tower tail gas purification device.

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

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

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

[0026] Figure 7 This invention 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 invention provides a partial structural diagram of the adjustment device for an automatic filter bag cleaning system of a granulation tower tail gas purification device.

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

[0029] Figure 10 This invention provides a schematic diagram of the auxiliary device structure of the automatic filter bag cleaning system of a 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; Figure 13 This is a schematic diagram of the automatic filter bag cleaning system of the granulation tower tail gas purification device according to the present invention.

[0032] Legend: 1. Granulation tower body; 2. Support frame; 3. Fan; 4. Support frame; 5. Filter bag opening; 6. Filter bag of purification device; 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 1003. Positioning plate; 1004. Positioning rod; 1005. Second spring; 1006. Positioning hole; 1007. Protective pad; 1008. Torsion spring; 1009. Slot; 10000. 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

[0033] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described below in conjunction with 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.

[0034] Numerous specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways than those described herein, and therefore the invention is not limited to the specific embodiments disclosed in the following specification.

[0035] 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.

[0036] 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.

[0037] 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 of the purification device are arranged on the inner wall of the granulation tower body. Each filter bag of the purification device has a filter bag opening on its surface. A cleaning device is provided on the arc surface of the purification device, and the cleaning device includes a water inlet pipe.

[0038] The above technical solution achieves the following: spray pipes are arranged inside the top of the cleaning chamber of the purification device in the nozzle granulation tower, and nozzles are installed on the spray pipes. 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 of the purification device from the filter bag openings, 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 pipes arranged inside are connected to the external water inlet pipes, 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 valves are opened through the operating system, so that the filter bags can be automatically cleaned.

[0039] Preferably, the arc surface of the water inlet pipe slides through the arc surface of the 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 of the purification device, the arc surface of the spray pipe is fixedly connected to the bottom end of the connecting frame, and a plurality of spray holes are opened on the arc surface of the inner wall of the spray pipe.

[0040] By adopting the above technical solution, when cleaning the filter bags of the purification device on the granulation tower, the pneumatic ball valve on the water inlet pipe can be opened and closed through the use of the water inlet pipe and the spray pipe on the granulation tower, so that the spray holes opened on the spray pipe can clean the inner wall of the filter bags of the purification device. This facilitates the convenient cleaning of the urea dust trapped and accumulated on the surface of the filter bags of the purification device.

[0041] 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.

[0042] This preferred solution achieves better alignment and positioning of the nozzles and spray holes on the spray pipe when cleaning the filter bags of the purification device using the spray holes on the spray pipe. At this time, the limiting plate that is connected to the nozzle rotates and aligns with the rotating plate, thereby squeezing and limiting the spray holes on the spray pipe between the limiting plate and the rotating plate, allowing the nozzles on the limiting plate to align with the spray holes. The angle between the two nozzles is 50 degrees, which can effectively cover and clean the area of ​​the filter bags of the purification device. Then, the rotating plate and the limiting plate are fixed and positioned by inserting a moving rod, which facilitates the adjustment, replacement and maintenance of the entire nozzle position.

[0043] Preferably, the upper arc surface of the nozzle is fitted with a sealing ring, the cross-sectional dimensions of which are adapted to the cross-sectional dimensions of the nozzle, and the sealing ring is a rubber ring. This preferred embodiment increases the sealing between the nozzle and the spray hole through the sealing ring, thereby helping to prevent water leakage at the joint between the spray hole and the nozzle.

[0044] 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. 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.

[0045] 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. This preferred solution achieves better protection and limitation between the fixing frame and the connecting frame when the positioning plate abuts and limits contact between them, thanks to the protective pads on the positioning plate.

[0046] 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. The inner wall of the slot engages with the arc surface of the locking block. This preferred solution achieves the goal that when the fixed frame and the connecting frame are docked, the locking block on the fixed frame and the slot on the connecting frame can engage and limit each other, thus facilitating the fixation and limiting of the entire connection between the fixed frame and the connecting frame.

[0047] Preferably, the inner walls at both ends of the support frame are provided with auxiliary devices. Each auxiliary device includes two fixed frames, one side of which is fixedly connected to both ends of the support frame. 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. The teeth of the drive gear mesh with a drive rack. One side of each drive rack is fixedly connected to the support frame. A common top plate is fixedly connected to the upper ends of both drive racks. 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. The cross-sectional dimensions of the extrusion columns are adapted to the cross-sectional dimensions of the nozzles. By adopting the above technical solution, when operating the nozzles on the spray pipe, in order to better protect the nozzles and avoid nozzle blockage and malfunction, the drive motor on the support frame drives the drive gear and drive rack to adjust their positions. This causes the top plate on the drive rack to raise and lower the position of the extrusion plate, allowing the extrusion columns on the extrusion plate to extrude and limit the inner wall of the nozzle, thus protecting the entire nozzle.

[0048] Preferably, several 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. This preferred solution achieves the goal of preventing the top plate from shifting during position adjustment by using sliding limiters between the sliding rods on the top plate and the connecting frames on the support frame, thus facilitating the limiting of the overall top plate position.

[0049] 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. This preferred solution achieves better extrusion protection of the entire nozzle area through the sealing frame on the extrusion plate, preventing damage from impacts.

[0050] The invention will now be further described with reference to the accompanying drawings.

[0051] Specifically, such as Figure 13As shown, the automatic filter bag cleaning system of the granulation tower tail gas purification device of the present invention 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 splits and connects to the spray flushing pipes according to different sections. 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.

[0052] Furthermore, such as Figures 1-12 As shown, the automatic filter bag cleaning system of the granulation tower tail gas purification device of the present invention 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 provided 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 provided at the bottom end of the fixing frame 7, a plurality of filter bags 6 provided on the inner wall of the purification device of the granulation tower body 1, a filter bag opening 5 provided on the surface of the filter bags 6 of the purification device, a cleaning device 9 provided on the arc surface of the granulation tower body 1, an adjustment device 10 provided on the upper arc surface of the connecting frame 8, and auxiliary devices 11 provided on the inner walls of both ends of the support frame 4.

[0053] The specific setup and function of its cleaning device 9, adjusting device 10 and auxiliary device 11 will be described in detail below.

[0054] like Figure 3 , Figure 4 , Figure 5 and Figure 6As 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 of the purification device. 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... A connecting plate and a limiting plate 961 are connected by a sliding rod 965 on their adjacent sides. A first spring 966 is fitted on the arc surface of the sliding rod 965. The two ends of the first spring 966 are fixedly connected to the rotating plate 962 and the sliding rod 965, respectively. A coil spring 964 is fitted on the arc surface of the limiting plate 961 away from the sliding 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.

[0055] 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 of the purification device. 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.

[0056] like Figure 7 , Figure 8 and Figure 9As 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.

[0057] 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.

[0058] like Figure 10 , Figure 11 and Figure 12As 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.

[0059] 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.

[0060] Example 2, based on Example 1, has the following overall working principle: In this invention, a spray pipe 94 is arranged inside the top of the cleaning chamber of the purification device in the nozzle granulation tower, 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 of the purification device from the filter bag opening 5, flows along the surface of the filter bag 6 of the purification device, and wets the filter bag 6 of the purification device. The material adhering to the outside of the filter bag 6 of the purification device 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 bag 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 bag.

[0061] When cleaning the filter bags 6 of the purification device on the granulation tower 1, the pneumatic ball valve 93 on the inlet pipe 91 of the purification device on the granulation tower 1 is used to open and close the inlet pipe 91 through the spray pipe 94, thereby allowing the spray holes 95 on the spray pipe 94 to clean the inner wall of the filter bags 6 of the purification device. This facilitates the cleaning of the urea dust trapped and accumulated on the surface of the filter bags 6 of the purification device. When using the spray holes 95 on the spray pipe 94 to clean the filter bags 6 of the purification device, in order to better connect and limit the nozzles 963 and spray holes 95 on the spray pipe 94, a limiting plate 961 that is connected to the nozzles 963 is used to allow the limiting plate 961 to rotate. The plate 962 rotates and connects, thereby squeezing and limiting the spray hole 95 on the spray pipe 94 between the limiting plate 961 and the rotating plate 962, so that the nozzle 963 on the limiting plate 961 connects with the spray hole 95. The angle between the two nozzles 963 is 50 degrees, which can effectively cover and clean the area of ​​the filter bag 6 of the purification device. Then, the rotating plate 962 and the limiting plate 961 are inserted and fixed by the moving rod 965, 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, thereby helping to prevent water from leaking at the connection between the spray hole 95 and the nozzle 963.

[0062] 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.

[0063] 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.

[0064] 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 the present invention are as follows:

[0065] 1. The automatic filter bag cleaning system of the granulation tower tail gas purification device of the present invention uses a spray pipe arranged inside the top of the cleaning chamber of the purification device in the nozzle granulation tower. The spray pipe is equipped with nozzles, 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. The water flows into the filter bags of the purification device 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 of the purification device dissolves in the water and falls off automatically, achieving the effect of cleaning the filter bags. The spray pipe arranged inside is 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.

[0066] 2. The automatic filter bag cleaning system of the granulation tower tail gas purification device of the present invention, through the setting of a cleaning device, cleans the filter bags of the purification device on the granulation tower body. This is achieved by using the water inlet pipe and the spray pipe on the granulation tower body, thereby opening and closing the water inlet pipe via a pneumatic ball valve. This allows the spray holes on the spray pipe to clean the inner wall of the filter bags, facilitating the convenient cleaning 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, at this time… The limiting plate, which is connected to the nozzle, rotates and aligns with the rotating plate. This squeezes and limits the spray holes on the spray pipe, allowing the nozzles on the limiting plate to align with the spray holes. The two nozzles are at a 50-degree angle, effectively covering and cleaning the filter bag area of ​​the purification device. 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 sealing between the nozzle and the spray hole, preventing water leakage at the joint between the nozzle and the spray hole.

[0067] 3. The automatic filter bag cleaning system of the granulation tower tail gas purification device of the present invention, 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 on the connecting 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 fixing and limiting 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 fixing and 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 each other, thereby facilitating the fixing and limiting of the entire fixed frame and the connecting frame.

[0068] 4. The automatic filter bag cleaning system of the granulation tower tail gas purification device of the present invention, through the setting of auxiliary devices, provides better protection for the nozzles when operating the nozzles on the spray pipe, 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 adjust their position, thereby causing the top plate on the drive rack to raise and lower the position of the extrusion plate. The extrusion column on the extrusion plate squeezes and limits the inside of the nozzle, thus helping to protect the entire nozzle. When adjusting the position of the entire top plate, 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 avoid damage to the nozzle from impact.

[0069] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention 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 invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. An automatic filter bag cleaning system for a granulation tower tail gas purification device, comprising a granulation tower body (1), characterized in that: The upper end of the granulation tower (1) is fixedly connected to a support frame (2). Several fans (3) are provided on the upper surface of the support frame (2). Several fans (3) are evenly distributed on the surface of the support frame (2). The upper surface of the granulation tower (1) is fixedly connected to a support frame (4). The bottom surface of the support frame (4) is fixedly connected to a fixing frame (7). The bottom end of the fixing frame (7) is provided with a connecting frame (8). Several filter bags (6) are provided on the inner wall of the granulation tower (1). Filter bag openings (5) are opened on the surface of several filter bags (6). A cleaning device (9) is provided on the arc surface of the granulation tower (1). The cleaning device (9) includes a water inlet pipe (91). The arc surface of the water inlet pipe (91) 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 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). The limiting plate (961) and the moving rod (965) are fixedly connected. A coil spring (964) is sleeved on the arc surface of the end 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). The angle between the two nozzles (963) is 50 degrees. The upper arc surface of the connecting frame (8) is provided with an adjustment device (10). The adjustment device (10) includes two positioning frames (1001). The ends of the two positioning frames (1001) that are far apart from each other are rotatably connected to positioning plates (1002). 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 fixed to the positioning rod (1003) and the positioning plate (1002) respectively. The fixed frame (7) has a positioning hole (1005) at the bottom 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). The arc surface of the positioning frame (1001) is fitted with a torsion spring (1007). Both ends of the torsion spring (1007) are fixedly connected to the positioning frame (1001). The bottom end of the positioning plate (1002) has a connecting hole (1010). The arc surface of the torsion spring (1007) slides through the inner wall of the connecting hole (1010).

2. The automatic filter bag cleaning system of the granulation tower tail gas purification device according to claim 1, 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 adapted to the cross-sectional dimensions of the nozzle (963). The sealing ring (967) is a rubber ring.

3. The automatic filter bag cleaning system of the granulation tower tail gas purification device according to claim 2, characterized in that: The positioning plate (1002) is fixedly connected to a protective pad (1006) on the side near the connecting frame (8). 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.

4. The automatic filter bag cleaning system of the granulation tower tail gas purification device according to claim 2, characterized in that: The upper end of the connecting frame (8) is provided with a slot (1008) on the side near the fixed frame (7). The bottom end of the fixed frame (7) is fixedly connected with a block (1009) corresponding to the slot (1008). The inner wall of the slot (1008) is engaged with the arc surface of the block (1009).

5. The automatic filter bag cleaning system of the granulation tower tail gas purification device according to claim 2, characterized in that: The inner walls of both ends of the support frame (4) are provided with auxiliary devices (11). The auxiliary devices (11) include two fixed frames (1104). One side of each of the two fixed frames (1104) is fixedly connected to both ends of the support frame (4). The inner walls of each fixed frame (1104) are fixedly connected with a drive motor (1103). The output end of each drive motor (1103) is fixedly connected with a drive gear (1102). The tooth surface of the drive gear (1102) meshes with a drive rack (1101). One side of each of the drive racks (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). The surface of the top plate (1105) is fixedly connected to the position of the nozzle (963). The two ends of the extrusion plate (1106) are fixedly connected to the positions of the nozzle (963). The cross-sectional dimensions of the extrusion column (1108) are adapted to the cross-sectional dimensions of the nozzle (963).

6. The automatic filter bag cleaning system of the granulation tower tail gas purification device according to claim 5, characterized in that: 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).

7. The automatic filter bag cleaning system of the granulation tower tail gas purification device according to claim 5, characterized in that: The extrusion plate (1106) is fixedly connected to the extrusion column (1108) with a sealing frame (1107), and the cross-sectional dimension of the sealing frame (1107) is larger than that of the nozzle (963).

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