A cyanuric acid-ammonium sulfate coproduction system tail gas purification recovery device and method thereof

Abstract

The application provides a cyanuric acid-ammonium sulfate co-production system tail gas purification and recovery device and method, belongs to the technical field of cyanuric acid manufacturing tail gas purification and recovery, and comprises an outer shell body, the outer shell body extends along the height direction, a spraying device is arranged on the inner upper side of the outer shell body, the spraying device is communicated with an external container storing dilute sulfuric acid, the spraying device is used for spraying the dilute sulfuric acid downward, a filler layer is arranged on the inner upper side of the outer shell body and below the spraying device, and a gas distributor is arranged on the inner lower side of the outer shell body, the first uniform distribution hole and the second uniform distribution hole are uniformly distributed on the disc, the opening and closing of the second uniform distribution hole is controlled by cooperating with a sealing assembly, the ventilation area and the ventilation resistance of the corresponding area can be flexibly adjusted, the ventilation flux is dynamically matched when the tail gas flow fluctuates, and the problems of excessively high or low local area flow rate are relieved.

Description

Technical Field

[0001] This invention belongs to the field of cyanuric acid manufacturing tail gas purification and recovery technology, specifically a cyanuric acid-ammonium sulfate co-production system tail gas purification and recovery device and method. Background Technology

[0002] Ammonia is a common byproduct or process gas in the co-production process of cyanuric acid and ammonium sulfate, as well as in industries such as fertilizer manufacturing, petroleum refining, and non-ferrous metal smelting. Industrially, the treatment of ammonia tail gas mainly adopts the wet absorption process, which uses acidic absorbents such as sulfuric acid and phosphoric acid to react with ammonia in an acid-base neutralization reaction, generating ammonium salt products such as ammonium sulfate and ammonium phosphate, thereby achieving the purification and resource recovery of ammonia.

[0003] Taking the most widely used packed tower as an example, after the gas enters from the bottom of the tower, it is dispersed to the packing layer by the gas distributor, and the absorbent is sprayed down from the top of the tower, forming a countercurrent contact on the surface of the packing.

[0004] Existing gas distributors in packed towers mostly use simple perforated plates or sieve structures. When the power of the conveying fan fluctuates or the gas flow fluctuates due to partial blockage in the pipeline, the gas is prone to flow deviation in the distributor. In some areas, the gas flow velocity is too high, resulting in insufficient contact time, while in other areas, the flow velocity is too low, or even a "dead zone" appears, which seriously affects the utilization rate of the packing layer and the ammonia purification efficiency.

[0005] Therefore, we propose a tail gas purification and recovery device and method for a cyanuric acid-ammonium sulfate co-production system to solve the problems encountered above. Summary of the Invention

[0006] The purpose of this invention is to solve the problem that the gas tends to deviate in the distributor, which leads to a decrease in the utilization rate of the packing layer and the ammonia purification efficiency. Therefore, this invention proposes a tail gas purification and recovery device and method for a cyanuric acid-ammonium sulfate co-production system.

[0007] The objective of this invention can be achieved through the following technical solution: The invention includes an outer shell extending along its height. A spraying device is disposed on the upper inner side of the outer shell, and the spraying device is connected to an external container storing dilute sulfuric acid. The spraying device is used to spray dilute sulfuric acid downwards. A packing layer is disposed on the upper inner side of the outer shell and below the spraying device. A gas distributor is disposed on the lower inner side of the outer shell. An air inlet assembly is disposed on one side of the lower outer shell, and one end of the air inlet assembly is connected to a cyanuric acid heating device. The gas distributor includes a disc with a plurality of first distribution holes evenly distributed on it. A plurality of second distribution holes are also distributed on the disc. A plurality of sealing assemblies are disposed inside the disc, and each sealing assembly is used to control the opening and closing of a corresponding second distribution hole. A driving assembly is also disposed on the outer shell to drive the disc to rotate.

[0008] In a preferred embodiment of the present invention, a cavity is provided inside the disk, the sealing assembly is located inside the cavity, and the second uniformly distributed holes are concentrated in a fan-shaped area on the disk.

[0009] In a preferred embodiment of the present invention, the sealing assembly includes a limiting frame, a baffle is provided inside the limiting frame, a groove is provided on the inner side of the limiting frame, a slider is fixed on the baffle, the slider is slidably disposed in the groove, an air passage is provided on the outer side of the limiting frame, an air inlet pipe is fixed at the outer end of the air passage, the corresponding side wall of the slider closes the inner side of the air passage, and multiple air inlets are interconnected.

[0010] In a preferred embodiment of the present invention, the drive assembly includes a connecting frame fixed to the top of the outer casing, a rotary drive structure fixed on the connecting frame, a hollow shaft fixed to the output end of the rotary drive structure, one end of the hollow shaft passing through the disk and extending below it, and the hollow shaft being fixedly connected to the disk.

[0011] In a preferred embodiment of the present invention, a main air pipe is provided inside the hollow shaft. The upper end of the main air pipe passes through the hollow shaft and extends to its outer side. The upper end of the main air pipe is connected to an external air source, which is used to change the air pressure inside the main air pipe. A branch pipe is fixed to the lower end of the main air pipe, and one end of the branch pipe is connected to one of the air inlets.

[0012] In a preferred embodiment of the present invention, a guide assembly is further provided on the lower inner side of the outer casing. The guide assembly includes an arc-shaped frame with an L-shaped cross-section. An outer sliding tube is fixed in the middle of the arc-shaped frame. A guide rod is fixedly connected to the bottom of the disc. The outer sliding tube is sleeved on the outside of the guide rod and slidably mounted on the guide rod. An air inlet chamber is formed on the lower inner side of the outer sliding tube. A telescopic air pipe is fixed on the air inlet chamber. One end of the telescopic air pipe is connected to the bottom end of the main air pipe. The top of the air inlet chamber... The part is closed by the bottom end of the guide rod. Several adjusting frames are distributed in a circle inside the arc-shaped frame. A rotating shaft is rotatably connected inside the adjusting frame. A torsion spring is sleeved on the outside of the rotating shaft. One end of the torsion spring is fixed to the outer wall of the rotating shaft. The other end of the torsion spring is fixedly connected to the corresponding wall surface of the adjusting frame. A flexible cloth is wound around the outside of the rotating shaft. One end of the flexible cloth is fixedly connected to the surface of the rotating shaft. One end of multiple flexible cloths is fixed to the same guide cloth. The guide cloth is fan-shaped. One end of the guide cloth is fixedly connected to the outside of the hollow shaft.

[0013] In a preferred embodiment of the present invention, two magnet blocks are fixed on the limiting frame, and the slider is made of ferromagnetic material.

[0014] In a preferred embodiment of the present invention, a connecting hole is provided at one end of the baffle. When the connecting hole is coaxially aligned with the second uniformly distributed holes on the upper and lower sides of the disk, the gas can pass through the corresponding second uniformly distributed hole. When the connecting hole is not coaxially aligned with the second uniformly distributed holes on the upper and lower sides, the gas cannot pass through the corresponding second uniformly distributed hole.

[0015] The present invention also provides a method for purifying and recovering tail gas from a cyanuric acid-ammonium sulfate co-production system, which is applied to the tail gas purification and recovery device of the cyanuric acid-ammonium sulfate co-production system described above, and includes the following steps: controlling the opening of the corresponding second uniformly distributed hole through the sealing component, so that the tail gas discharged from the cyanuric acid heating device can pass through the first uniformly distributed hole and the second uniformly distributed hole simultaneously, and controlling the rotation of the disk through the driving component.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) By setting a uniformly distributed first uniformly distributed hole and a fan-shaped concentrated second uniformly distributed hole on the disk, and controlling the opening and closing of the second uniformly distributed hole with the sealing component, the ventilation area and ventilation resistance of the corresponding area can be flexibly adjusted, and the ventilation flux can be dynamically matched when the exhaust gas flow fluctuates, thus alleviating the problem of excessively high or low flow velocity in the local area. (2) By driving the disk to rotate circumferentially through the drive component, the adjustable ventilation area can be moved circumferentially along the cross section of the tower body, and the differentiated ventilation resistance can be applied to any fan-shaped area where the flow deviates, thereby specifically limiting the ventilation volume in the high flow velocity area and compensating for the ventilation volume in the low flow velocity area, effectively eliminating airflow deviates and local dead zones, and improving the utilization efficiency of each area of ​​the packing layer. (3) By setting a fan-shaped guide cloth structure that can be raised and lowered under the disc, it can be deployed to form an inclined guide surface under the deflection condition, apply radial guiding force to the local excessive airflow, guide the gas to diffuse to the surrounding low flow velocity area, and form a double uniform distribution effect in combination with the airflow adjustment of the uniform distribution holes, further enhancing the uniform effect of gas distribution. Attached Figure Description

[0017] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the planar cross-sectional structure of the present invention; Figure 3 This is a partial three-dimensional magnified structural diagram of the present invention; Figure 4 This is a partial three-dimensional magnified structural diagram of the present invention; Figure 5 For the present invention Figure 4 Enlarged view of the structure at point A in the middle; Figure 6 This is a partial three-dimensional structural schematic diagram of the present invention; Figure 7 This is a schematic diagram of the left cross-sectional three-dimensional structure of the present invention; Figure 8 This is a three-dimensional enlarged structural diagram of the sealing assembly of the present invention; Figure 9 This is a three-dimensional enlarged cross-sectional view of the sealing assembly of the present invention; Figure 10 This is a top view and a front view of the sealing assembly and the mating part of the disc in this invention. Figure 11 This is a partially enlarged three-dimensional structural schematic diagram of the present invention; Figure 12 This is a three-dimensional enlarged structural diagram of the guidance component of the present invention.

[0019] In the diagram: 1. Outer shell; 2. Spraying equipment; 3. Packing layer; 4. Gas distributor; 401. Disc; 402. First distribution hole; 403. Second distribution hole; 404. Cavity; 5. Air intake assembly; 6. Sealing assembly; 601. Limiting frame; 602. Baffle; 603. Slide groove; 604. Slider; 605. Air passage; 606. Air intake pipe; 607. Main air pipe; 608. Branch air pipe; 609. Magnet block; 610. Connecting hole; 7. Drive assembly; 701. Connecting frame; 702. Rotary drive structure; 703. Hollow shaft; 8. Guide assembly; 801. Arc frame; 802. Outer slide tube; 803. Guide rod; 804. Air intake chamber; 805. Telescopic air pipe; 806. Adjusting frame; 807. Rotating shaft; 808. Torsion spring; 809. Guide cloth. Detailed Implementation

[0020] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see Figures 1-12As shown, a tail gas purification and recovery device for a cyanuric acid-ammonium sulfate co-production system includes an outer shell 1, which extends along the height direction. A spray device 2 is provided on the upper inner side of the outer shell 1. The spray device 2 is connected to an external container storing dilute sulfuric acid. The spray device 2 is used to spray dilute sulfuric acid downwards. A packing layer 3 is provided on the upper inner side of the outer shell 1 and below the spray device 2. A gas distributor 4 is provided on the lower inner side of the outer shell 1. An air inlet assembly 5 is provided on one side of the lower side of the outer shell 1. One end of the air inlet assembly 5 is connected to a cyanuric acid heating device. The gas distributor 4 includes a disc 401. A plurality of first distribution holes 402 are evenly opened on the disc 401. A plurality of second distribution holes 403 are also opened on the disc 401. A plurality of sealing assemblies 6 are provided inside the disc 401. A single sealing assembly 6 is used to control the opening and closing of the corresponding second distribution hole 403. A driving assembly 7 is also provided on the outer shell 1. The driving assembly 7 is used to drive the disc 401 to rotate. In this embodiment, the outer shell 1 can be a cylindrical structure extending in the vertical direction, and its cross-section can be circular. The material of the outer shell 1 can be carbon steel lined with fiberglass, stainless steel or fiberglass and other materials resistant to dilute sulfuric acid corrosion. The inner upper side and inner lower side of the outer shell 1 are two opposite ends. The upper end of the outer shell 1 can be provided with a detachable end cap or inspection port to facilitate the inspection and replacement of internal components. A spraying device 2 is provided on the upper inner side of the outer casing 1. The spraying device 2 may include a spraying main pipe, several spraying branch pipes and uniformly distributed atomizing nozzles. The spraying main pipe is connected to an external container storing dilute sulfuric acid through a corrosion-resistant pipeline (such as a fluoropolymer-lined pipe or a PP pipe). The spraying device 2 is used to spray dilute sulfuric acid uniformly from top to bottom in the form of atomization or liquid film. The spraying device 2 may adopt the distributor form commonly used in the prior art (such as a pipe type, disc type or trough type). A packing layer 3 is provided on the upper inner side of the outer casing 1 and below the spraying equipment 2. The packing layer 3 may include several packing materials arranged regularly or randomly. The material of the packing material may be polypropylene, polyvinyl chloride, ceramic or stainless steel, etc., which are resistant to dilute sulfuric acid corrosion. The form of the packing material may be one or more combinations of Pall rings, rectangular saddle rings, stepped rings, Hell rings or wire mesh corrugated packing. The packing layer 3 is located directly below the spraying equipment 2. The spacing between the two can be adjusted according to the filling height of the packing layer 3 to avoid the spraying liquid directly scouring the packing layer 3. A gas distributor 4 is provided on the inner lower side of the outer shell 1. The gas distributor 4 is located directly below the packing layer 3 to facilitate sufficient radial diffusion of gas after passing through the gas distributor 4. The cross-sectional shape of the gas distributor 4 is adapted to the inner cross-sectional shape of the outer shell 1. The gas distributor 4 includes a disc 401. The shape of the disc 401 is adapted to the inner cross-section of the outer shell 1. It is usually a circular disc. The disc 401 can be formed by two upper and lower cover plates and a central annular side plate, or it can be machined from a single solid disc. A plurality of first uniformly distributed holes 402 are evenly opened on the disk 401. The first uniformly distributed holes 402 can be through holes. The first uniformly distributed holes 402 are evenly arrayed along the circumference and radial direction of the disk 401 to achieve basic uniform distribution of ammonia-containing tail gas. A plurality of second uniformly distributed holes 403 are also opened on the disk 401. The diameter of the second uniformly distributed holes 403 is the same as or similar to the diameter of the first uniformly distributed holes 402. In this embodiment, they are preferably the same. The distribution characteristics of the second uniformly distributed holes 403 are different from those of the first uniformly distributed holes 402. The disc 401 is provided with a number of sealing components 6. Each sealing component 6 is used to control the opening and closing of the corresponding second uniformly distributed hole 403. That is, a sealing component 6 is provided directly below each second uniformly distributed hole 403. The sealing component 6 can control the second uniformly distributed hole 403 to be in an open or closed state by its own opening and closing action. The outer shell 1 is also provided with a drive assembly 7, which is used to drive the disk 401 to rotate. By driving the disk 401 to rotate around its own central axis, the drive assembly 7 can change the relative positional relationship between different areas on the disk 401 (including the distribution areas of the first uniformly distributed holes 402 and the second uniformly distributed holes 403) and the airflow inside the outer shell 1, thereby adjusting the gas passage in different areas. An air intake assembly 5 is provided on the lower side of the outer shell 1. The air intake assembly 5 can be a tubular structure, with one end connected to the cyanuric acid heating device and the other end connected to the cavity below the disc 401 or the lower inner cavity of the outer shell 1. The air intake assembly 5 is used to introduce the ammonia-containing tail gas discharged from the cyanuric acid heating device into the interior of the outer shell 1. The air intake assembly 5 can be a single main pipeline or a pipeline system with branches. In this embodiment, a single main pipeline is preferred. The diameter of the pipeline can be designed according to the tail gas flow rate and pipeline pressure loss. The connection between the air intake assembly 5 and the outer shell 1 can be provided with a flange or threaded connection to facilitate disassembly and maintenance. After the above structural combination, the ammonia-containing tail gas can be pre-distributed before entering the packing layer 3, and the deviation phenomenon and dead zone phenomenon can be effectively suppressed by the rotation of the disc 401 and the flexible adjustment of the sealing component 6, thereby improving the utilization rate of the packing layer 3 and the ammonia purification efficiency.

[0022] A cavity 404 is provided inside the disk 401, the sealing component 6 is located inside the cavity 404, and the second uniformly distributed holes 403 are concentrated in a fan-shaped area on the disk 401. In this embodiment, a cavity 404 is provided inside the disk 401. The cavity 404 can be a closed hollow cavity structure located inside the disk 401. The radial dimension of the cavity 404 along the disk 401 can be the same as the radius of the disk 401, or it can be slightly smaller than the radius of the disk 401. The thickness dimension of the cavity 404 can be smaller than the total thickness of the disk 401, so that a wall structure with sufficient strength can be left on both the upper and lower surfaces of the disk 401. The cavity 404 can provide a hidden accommodating space for the installation and operation of the sealing component 6. The sealing component 6 is located inside the cavity 404. The sealing component 6 is wholly or partially contained in the cavity 404. The height dimension of the sealing component 6 should be less than or equal to the axial dimension of the cavity 404 to avoid the sealing component 6 extending to the upper or lower surface of the disk 401 and affecting the assembly of other structures. The position of the sealing component 6 should correspond to the second uniformly distributed holes 403 on the disk 401, that is, a sealing component 6 is arranged directly below each second uniformly distributed hole 403. The second uniformly distributed holes 403 are concentrated in a fan-shaped area on the disk 401. The fan-shaped area here refers to the fan-shaped surface enclosed by the center of the disk 401 as the vertex and the radius of the disk 401 as the radius. The central angle of the fan-shaped area can be 30°-180°. The distribution density of the second uniformly distributed holes 403 in the fan-shaped area, that is, the number of second uniformly distributed holes 403 per unit area, can be higher than the distribution density of the first uniformly distributed holes 402 in other areas of the disk 401. The aperture of the second uniformly distributed holes 403 is the same as the aperture of the first uniformly distributed holes 402. It should be noted that the fan-shaped area is the concentrated distribution area of ​​the second uniformly distributed holes 403, but it does not rule out the possibility that a small number of second uniformly distributed holes 403 are still distributed outside the fan-shaped area. Based on the above structural design, the air permeability adjustment of the disc 401 can be centralized, controllable, and flexible.

[0023] The sealing assembly 6 includes a limiting frame 601, a baffle 602 is provided inside the limiting frame 601, a groove 603 is provided on the inner side of the limiting frame 601, a slider 604 is fixed on the baffle 602, the slider 604 is slidably disposed in the groove 603, an air passage 605 is provided on the outer side of the limiting frame 601, an air inlet pipe 606 is fixed to the outward end of the air passage 605, the corresponding side wall of the slider 604 seals the inward side of the air passage 605, and multiple air inlet pipes 606 are interconnected. In this embodiment, the sealing component 6 includes a limiting frame 601. The limiting frame 601 can be a square, rectangular or circular frame structure. The material of the limiting frame 601 can be stainless steel to enhance its resistance to dilute sulfuric acid corrosion. The limiting frame 601 is fixed to the inner wall of the cavity 404, and its installation position should correspond to the axial position of the second uniformly distributed hole 403. A baffle 602 is provided inside the limiting frame 601. The baffle 602 can be a sheet structure, and its shape is adapted to the cross-sectional shape of the limiting frame 601. The thickness of the baffle 602 can be slightly smaller than the inner wall spacing of the limiting frame 601 to ensure that the baffle 602 can slide in a preset direction within the limiting frame 601. The sliding of the baffle 602 within the limiting frame 601 can be driven by the air pressure of an external air source. The material of the baffle 602 can be stainless steel, polytetrafluoroethylene, or rigid PVC and other corrosion-resistant materials. In this embodiment, polytetrafluoroethylene is preferred to reduce sliding resistance and improve sealing performance. A groove 603 is provided on one inner side of the limiting frame 601. The groove 603 can be a strip-shaped groove extending along the length direction of the limiting frame 601. A slider 604 is fixed on the baffle 602. The slider 604 is adapted to the shape of the groove 603. The slider 604 is slidably disposed in the groove 603. The sliding cooperation between the slider 604 and the groove 603 can constrain and guide the sliding direction of the baffle 602, so that the baffle 602 can only slide along the extension direction of the groove 603. An air passage 605 is provided on the outer side of the limiting frame 601. The air passage 605 is a channel structure that runs through the outer wall of the limiting frame 601. An air inlet pipe 606 is fixed at the outer end of the air passage 605 (i.e. the end facing the outer side of the limiting frame 601). The shape of the air inlet pipe 606 can be tubular or cylindrical. The corresponding side wall of the slider 604 closes the inner side of the air passage 605. Multiple air intake pipes 606 are interconnected. Here, multiple air intake pipes 606 refer to multiple air intake pipes 606 corresponding to different limit frames 601. Multiple air intake pipes 606 are interconnected and can be supplied with air by a common air source. By controlling the air pressure and on / off time of the air source, multiple baffles 602 can be driven to move synchronously, thereby controlling the opening and closing state of multiple second uniformly distributed holes 403 simultaneously. Based on the above structure, the opening and closing state of the second uniformly distributed hole 403 can be flexibly controlled by air pressure.

[0024] The drive assembly 7 includes a connecting frame 701 fixed to the top of the housing 1. A rotary drive structure 702 is fixed on the connecting frame 701. A hollow shaft 703 is fixed to the output end of the rotary drive structure 702. One end of the hollow shaft 703 passes through the disk 401 and extends to its lower part. The hollow shaft 703 is fixedly connected to the disk 401. In this embodiment, the drive assembly 7 includes a connecting frame 701, which is fixed to the top of the housing 1. The connection method between the connecting frame 701 and the housing 1 can be one or more of welding, bolting, or flange connection. A rotary drive structure 702 is fixed on the connecting frame 701. The rotary drive structure 702 can be one or more of an electric motor, a pneumatic motor, a hydraulic motor, or a manual drive structure. In this embodiment, a servo motor or a variable frequency speed control motor is preferred to facilitate control of the rotation angle and rotation speed of the disc 401. A hollow shaft 703 is fixed at the output end of the rotary drive structure 702. One end of the hollow shaft 703 passes through the disk 401 and extends below it. Here, "passing through" means that the hollow shaft 703 passes through the upper and lower surfaces of the disk 401 in sequence. The other end of the hollow shaft 703 can extend to the vicinity of the bottom of the outer shell 1. In this embodiment, its specific extension length is not strictly limited. The hollow shaft 703 is a hollow tubular structure, and its internal space can be used to arrange other pipes, cables or sensor connection lines. When the output end of the rotary drive structure 702 drives the hollow shaft 703 to rotate, since the hollow shaft 703 is fixedly connected to the disk 401, the disk 401 will rotate synchronously with the hollow shaft 703. The rotation direction of the disk 401 can be clockwise or counterclockwise. The rotary drive structure 702 can be electrically connected to an external PLC or DCS control system to realize remote automatic control of the rotation of the disk 401. Based on the above structure, a stable rotational driving force can be provided for the disk 401, enabling the disk 401 to rotate at a preset speed and direction.

[0025] A main air pipe 607 is provided inside the hollow shaft 703. The upper end of the main air pipe 607 passes through the hollow shaft 703 and extends to its outer side. The upper end of the main air pipe 607 is connected to an external air source. The air source is used to change the air pressure inside the main air pipe 607. A branch pipe 608 is fixed at the lower end of the main air pipe 607. One end of the branch pipe 608 is connected to one of the air inlets 606. In this embodiment, a main air pipe 607 is provided inside the hollow shaft 703. Its outer diameter should be smaller than the inner diameter of the hollow shaft 703 so that the main air pipe 607 can be installed inside the hollow shaft 703. A sealing ring, packing seal or mechanical seal can be provided between the main air pipe 607 and the hollow shaft 703 to prevent gas leakage. The axial position of the main air pipe 607 can coincide with the axial position of the hollow shaft 703 or it can deviate from the axial position of the hollow shaft 703. In this embodiment, it is preferred to coincide to simplify the structure. The upper end of the main air pipe 607 passes through the hollow shaft 703 and extends to its outer side. The upper end of the main air pipe 607 is connected to an external air source. The air source can be one or more of compressed air, compressed nitrogen, compressed carbon dioxide, or a vacuum pump. The air source is used to change the air pressure in the main air pipe 607. It can either introduce pressurized gas into the main air pipe 607 or extract gas from the main air pipe 607 to control the sliding direction and sliding amplitude of the baffle 602. A bronchus 608 is fixed to the lower end of the main air pipe 607. The diameter of the bronchus 608 is smaller than that of the main air pipe 607. The lower end of the bronchus 608 and the main air pipe 607 can be connected separately or integrally formed. One end of the bronchus 608 is fixedly connected to the lower end of the main air pipe 607, and the other end is connected to one of the air inlet pipes 606. That is to say, the bronchus 608 acts as a connecting channel between the main air pipe 607 and the air inlet pipe 606. When an external air source introduces pressurized gas into the main air pipe 607, the pressurized gas can pass through the main air pipe 607 and the bronchus 608 in sequence and enter the air inlet pipe 606, thereby driving the baffle 602 to slide. It should be noted that the main air pipe 607, bronchial pipe 608 and air inlet pipe 606 in this embodiment can adopt a split structure, that is, each section of the pipe is processed separately and then connected to each other, or they can adopt an integrated structure, that is, integral injection molding. The connection between each pipe should be provided with a sealing ring, sealant or sealing gasket to ensure airtightness. The number of bronchial pipes 608 can be one or more. When there are multiple bronchial pipes 608, multiple bronchial pipes 608 can be connected to multiple different air inlet pipes 606 respectively. Based on the above structure, pneumatic driving force can be provided to the baffle 602 to realize automatic control of the opening and closing state of the second uniformly distributed holes 403.

[0026] A guide assembly 8 is also provided on the lower inner side of the outer casing 1. The guide assembly 8 includes an arc-shaped frame 801 with an L-shaped cross-section. An outer sliding tube 802 is fixed in the middle of the arc-shaped frame 801. A guide rod 803 is fixedly connected to the bottom of the disc 401. The outer sliding tube 802 is sleeved on the outside of the guide rod 803 and slidably mounted on the guide rod 803. An air inlet chamber 804 is opened on the lower inner side of the outer sliding tube 802. A telescopic air pipe 805 is fixed on the air inlet chamber 804. One end of the telescopic air pipe 805 is connected to the bottom end of the main air pipe 607. The top of the air inlet chamber 804 is guided by the guide rod 802. The bottom of 3 is closed. Several adjusting frames 806 are distributed in a circle inside the arc-shaped frame 801. A rotating shaft 807 is rotatably connected inside the adjusting frame 806. A torsion spring 808 is sleeved on the outside of the rotating shaft 807. One end of the torsion spring 808 is fixed to the outer wall of the rotating shaft 807. One end of the torsion spring 808 is fixedly connected to the corresponding wall of the adjusting frame 806. A flexible cloth is wrapped around the outside of the rotating shaft 807. One end of the flexible cloth is fixedly connected to the surface of the rotating shaft 807. One end of multiple flexible cloths is fixed to the same guide cloth 809. The guide cloth 809 is fan-shaped. One end of the guide cloth 809 is fixedly connected to the outside of the hollow shaft 703. In this embodiment, a guide assembly 8 is also provided on the lower inner side of the outer shell 1. The guide assembly 8 is located below the disk 401 and is connected to the disk 401. The guide assembly 8 includes an arc frame 801. The cross-section of the arc frame 801 is L-shaped. One side of the L-shaped cross-section can be set as a vertical section and the other side can be set as a horizontal section. The curvature of the arc frame 801 can be consistent with the circumference of the disk 401. An outer sliding tube 802 is fixed in the middle of the arc frame 801. The diameter of the outer sliding tube 802 should be slightly larger than the diameter of the guide rod 803 to ensure that the outer sliding tube 802 can slide on the outside of the guide rod 803. The connection between the outer sliding tube 802 and the arc frame 801 can be one or more of welding, riveting, integral molding or bolt connection. A sealing ring or sealing gasket can be provided between the outer wall of the outer sliding tube 802 and the arc frame 801. A guide rod 803 is fixedly connected to the bottom of the disk 401. The guide rod 803 extends along the axial direction of the disk 401. Its upper end is fixedly connected to the bottom of the disk 401, and its lower end is suspended. The diameter of the guide rod 803 should be slightly smaller than the inner diameter of the outer slide tube 802. The outer slide tube 802 is sleeved on the outside of the guide rod 803. The outer slide tube 802 is slidably mounted on the guide rod 803. The outer slide tube 802 can slide along the axial direction of the guide rod 803. Its sliding range is limited by the length of the guide rod 803. A guide key or guide groove can be provided between the outer slide tube 802 and the guide rod 803 to prevent the outer slide tube 802 from deflecting during the sliding process. An air inlet chamber 804 is provided on the lower inner side of the outer slide tube 802. The air inlet chamber 804 is a hollow structure in the lower part of the outer slide tube 802. The top of the air inlet chamber 804 is closed by the bottom end of the guide rod 803. That is, the bottom end of the guide rod 803 is inserted into the interior of the outer slide tube 802 and abuts against the top of the air inlet chamber 804, thereby closing the top of the air inlet chamber 804. The air inlet chamber 804 can provide a buffer space for the ventilation of the lower part of the outer slide tube 802. A [missing information - likely a device or component] is fixed on the air inlet chamber 804. The telescopic air tube 805 can be a corrugated tube, a snake-skin tube, or a corrugated telescopic tube type telescopic flexible hose. One end of the telescopic air tube 805 is connected to the bottom end of the main air tube 607, and the other end is connected to the air inlet chamber 804. When the outer slide tube 802 slides along the guide rod 803 axially, the telescopic air tube 805 can extend or shorten accordingly to ensure the connectivity of the gas pipeline. The extension and retraction amount of the telescopic air tube 805 can be designed according to the stroke of the outer slide tube 802. The arc-shaped frame 801 contains several adjusting frames 806 arranged in a circular pattern. The number of adjusting frames 806 can be 3-12. A rotating shaft 807 is rotatably connected inside the adjusting frame 806. The rotating shaft 807 extends radially along the adjusting frame 806, and its two ends are rotatably connected to the adjusting frame 806 through bearings or bearing seats. A torsion spring 808 is sleeved on the outside of the rotating shaft 807. One end of the torsion spring 808 is fixed to the outer wall of the rotating shaft 807, and the other end is fixedly connected to the corresponding wall surface of the adjusting frame 806. In its natural state, the torsion spring 808 keeps the rotating shaft 807 at a preset initial angle, that is, the angle at which the flexible cloth is in a planar state. A flexible cloth is wound around the outside of the rotating shaft 807. One end of the flexible cloth is fixedly connected to the surface of the rotating shaft 807. That is, the flexible cloth is wound around the rotating shaft 807 and is released or retracted as the rotating shaft 807 rotates. The other end of the multiple flexible cloths is fixed to the same guide cloth 809. The guide cloth 809 is fan-shaped. The sum of the central angle of the fan shape and the central angle of the fan-shaped area where the second uniformly distributed holes 403 are concentrated can be 360 ​​degrees. The fan shape of the guide cloth 809 can be staggered with the fan-shaped area where the second uniformly distributed holes 403 are concentrated. One end of the guide cloth 809 is fixedly connected to the outside of the hollow shaft 703. The other end of the guide cloth 809 is pulled by multiple flexible cloths respectively. The material of the flexible cloth can be one or more of polyester fiber cloth, glass fiber cloth, aramid fiber cloth or polytetrafluoroethylene coated cloth. In this embodiment, polyester fiber cloth is preferred. When the air intake of the telescopic air tube 805 increases and the outer slide tube 802 slides downward along the guide rod 803, the air pressure in the air intake chamber 804 increases, which in turn drives the flexible cloth on each adjustment frame 806 to deflect (i.e., the flexible cloth is pulled outward), causing the guide cloth 809 to change from the initial horizontal state to the inclined state. Specifically, the end of the guide cloth 809 near the center of the disk 401 remains unchanged, while the end of the guide cloth 809 near the outer periphery (i.e. the end pulled by multiple flexible cloths) slides downward, so that the guide cloth 809 as a whole forms an inclined surface that is inclined upward from the inside and downward from the outside. Conversely, when the outer slide tube 802 slides upward along the guide rod 803, the flexible cloth is retracted, and the guide cloth 809 returns to the horizontal state. The torsion spring 808 can automatically restore the guide cloth 809 to a horizontal state when the external force is lost, that is, when the air pressure in the air intake chamber 804 decreases, so as to avoid the guide cloth 809 being in a tilted state for a long time and affecting the airflow distribution. The elastic coefficient of the torsion spring 808 can be selected according to the weight, area and tilt angle of the guide cloth 809. Based on the above structure, the tilt angle of the guide cloth 809 can be flexibly adjusted by air pressure drive, thereby achieving effective control of the radial force of the airflow.

[0027] Two magnet blocks 609 are fixed on the limiting frame 601, and the slider 604 is made of ferromagnetic material; In this embodiment, two magnet blocks 609 are fixed on the limiting frame 601. The two magnet blocks 609 are respectively arranged on both sides of the slider 604 along the sliding direction of the baffle 602. The shape of the magnet blocks 609 can be a cuboid or a cylinder. The connection method between the magnet blocks 609 and the limiting frame 601 can be adhesive, bolt fixing or snap-fit ​​connection. The slider 604 is made of ferromagnetic material. Ferromagnetic material here refers to material that can be attracted by the magnetic field of magnet 609, including pure iron, carbon steel, silicon steel, iron-nickel alloy, iron-cobalt alloy or iron-aluminum alloy, etc. The material of slider 604 is ferromagnetic, so that slider 604 can be attracted by the magnetic field of magnet 609. That is to say, when baffle 602 slides to a certain position, slider 604 can correspond to magnet 609 and be attracted by magnet 609, thereby realizing the positioning of baffle 602 at that position. The arrangement of the two magnet blocks 609 allows the baffle 602 to have two stable stopping positions within the sliding range, namely two positions corresponding to the two magnet blocks 609 respectively. When the external air source removes the air pressure, the baffle 602 can be attracted by one of the two magnet blocks 609, thus maintaining it in the preset position. This arrangement can prevent the baffle 602 from shifting position after the air source pressure is lost, thereby improving the stability of the sealing assembly 6. Based on the above settings, the position of the baffle 602 can be located, thereby improving the anti-interference capability of the sealing assembly 6.

[0028] A connecting hole 610 is provided at one end of the baffle 602. When the connecting hole 610 is coaxially aligned with the second uniformly distributed holes 403 on the upper and lower sides of the disk 401, the gas can pass through the corresponding second uniformly distributed holes 403. When the connecting hole 610 is not coaxially aligned with the second uniformly distributed holes 403 on the upper and lower sides, the gas cannot pass through the corresponding second uniformly distributed holes 403. In this embodiment, a connecting hole 610 is provided at one end of the baffle 602. The shape of the connecting hole 610 can be circular. The diameter of the connecting hole 610 should be the same as or slightly larger than the diameter of the second uniformly distributed hole 403 to ensure that gas can pass through the connecting hole 610. The axial direction of the connecting hole 610 is consistent with the axial direction of the second uniformly distributed hole 403. The connecting hole 610 is coaxially corresponding to the second uniformly distributed holes 403 on the upper and lower sides of the disk 401. Here, coaxial correspondence means that the axis of the connecting hole 610 coincides with the axis of the second uniformly distributed holes 403, and the connecting hole 610 and the second uniformly distributed holes 403 are spatially interconnected. When the connecting hole 610 is coaxially corresponding to the second uniformly distributed holes 403 on the upper side and the second uniformly distributed holes 403 on the lower side of the disk 401, the gas can pass from the second uniformly distributed hole 403 on the lower side through the connecting hole 610 to the second uniformly distributed hole 403 on the upper side, and then pass through the baffle 602. When the connecting hole 610 is not coaxially aligned with the second uniformly distributed holes 403 on the upper and lower sides, the non-correspondence here means that the axis of the connecting hole 610 is deviated from the axis of the second uniformly distributed holes 403. That is, there is a certain radial offset between the axis of the connecting hole 610 and the axis of the second uniformly distributed holes 403, or the connecting hole 610 and the second uniformly distributed holes 403 are not spatially connected. When the connecting hole 610 is not coaxially aligned with the second uniformly distributed holes 403, the solid part of the baffle 602 will block the second uniformly distributed holes 403, thereby preventing gas from passing through the baffle 602. In other words, the sliding of the baffle 602 can change the relative positional relationship between the connecting hole 610 and the second uniformly distributed hole 403: when the baffle 602 slides to the open position, that is, when the connecting hole 610 and the second uniformly distributed hole 403 are coaxially aligned, gas can pass through the baffle 602; when the baffle 602 slides to the closed position, that is, when the connecting hole 610 is not coaxially aligned with the second uniformly distributed hole 403, gas cannot pass through the baffle 602. The open and closed positions of the baffle 602 correspond to the two stopping positions of the slider 604 and the two magnet blocks 609, respectively. Based on the above structure, flexible control of the opening and closing state of the second uniformly distributed holes 403 can be achieved.

[0029] A method for purifying and recovering tail gas from a cyanuric acid-ammonium sulfate co-production system includes the following steps: controlling the opening of the corresponding second uniformly distributed hole 403 through the sealing component 6, so that the tail gas discharged from the cyanuric acid heating device can simultaneously pass through the first uniformly distributed hole 402 and the second uniformly distributed hole 403; and controlling the rotation of the disc 401 through the driving component 7.

[0030] When using this invention, the user first activates the rotary drive structure 702, which drives the hollow shaft 703 to rotate, thereby causing the disc 401 to rotate. The rotation direction of the disc 401 can be clockwise or counterclockwise. Next, the user activates the external air source, which introduces pressurized gas into the main air pipe 607. The pressurized gas passes through the main air pipe 607 and the branch pipe 608 in sequence and enters the air inlet pipe 606. The pressurized gas in the air inlet pipe 606 enters the interior of the limiting frame 601 through the air passage 605. The pressurized gas drives the baffle 602 to slide along the extension direction of the slide groove 603, so that the connecting hole 610 is coaxially aligned with the second evenly distributed holes 403 on the upper and lower sides of the disc 401. At this time, the second evenly distributed holes 403 are in the open state. At the same time, the slider 604 is attracted by the magnet 609 on the side close to the second evenly distributed hole 403, and the baffle 602 is stably held in the open position. Since the second uniformly distributed holes 403 are concentrated in the fan-shaped area of ​​the disk 401, all the second uniformly distributed holes 403 in the fan-shaped area are in the open state, and the air permeability of the fan-shaped area on the disk 401 increases. The ammonia-containing tail gas passes through the air intake component 5, the lower part of the outer shell 1, the space below the disk 401, the first uniformly distributed holes 402 and the second uniformly distributed holes 403 in sequence, and then enters the lower part of the packing layer 3. During the process of passing through the first uniformly distributed holes 402 and the second uniformly distributed holes 403, the ammonia-containing tail gas is dispersed into multiple small airflows, and the airflow distribution is more uniform. Meanwhile, the user can also introduce pressurized gas into the telescopic air tube 805 through an external air source. The pressurized gas passes through the main air tube 607, the telescopic air tube 805 and the air inlet chamber 804 in sequence, causing the outer slide tube 802 to slide downward along the axis of the guide rod 803. The sliding of the outer slide tube 802 increases the air intake of the telescopic air tube 805, which in turn drives the flexible cloth on each adjustment frame 806 to deflect. The deflection of the flexible cloth causes the guide cloth 809 to change from the initial horizontal state to the inclined state. The inclined state of the guide cloth 809 (inner side inclined upward and outer side inclined downward) can give the gas passing through it radial force, thereby guiding the gas to diffuse to other areas of the disk 401. In actual operation, users can also monitor the gas flow rate and velocity at different locations in real time by using several detectors, such as pressure sensors, flow sensors, or speed sensors, which are arranged circumferentially inside the outer casing 1, specifically between the gas distributor 4 and the packing layer 3. The detectors transmit the monitored data to the control system, such as a PLC or DCS control system. The control system automatically determines the location and degree of gas deviation based on the differences in the values ​​of the detectors at different locations, and automatically controls the rotation angle and rotation speed of the rotary drive structure 702, so that the inclined area of ​​the guide cloth 809, that is, the fan-shaped area where the guide cloth 809 is located, rotates to the position where the gas deviation is most severe. At the same time, the control system can also automatically adjust the gas pressure and on / off time of the external gas source according to the gas deviation situation, so that the sliding amplitude and sliding timing of the baffle 602 match the gas deviation situation. When it is necessary to stop using the device, the user first turns off the external air source or draws air out of the main air pipe 607 through the external air source to provide negative air pressure. At this time, the baffle 602 is attracted to the preset position under the magnetic force of the magnet 609, the connecting hole 610 is not coaxially aligned with the second uniformly distributed hole 403, the second uniformly distributed hole 403 is in the closed state, and the guide cloth 809 returns to the horizontal state under the elastic force of the torsion spring 808. Finally, the user turns off the spraying device 2 and stops spraying dilute sulfuric acid.

[0031] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A tail gas purification and recovery device for a cyanuric acid-ammonium sulfate co-production system, characterized in that, The system includes an outer shell (1) extending along its height. A spraying device (2) is installed on the upper inner side of the outer shell (1). The spraying device (2) is connected to an external container storing dilute sulfuric acid. The spraying device (2) is used to spray dilute sulfuric acid downwards. A packing layer (3) is installed on the upper inner side of the outer shell (1) and below the spraying device (2). A gas distributor (4) is installed on the lower inner side of the outer shell (1). An air inlet assembly (5) is installed on one side of the lower part of the outer shell (1). The air inlet assembly (5) has... One end is connected to a cyanuric acid heating device. The gas distributor (4) includes a disc (401). A plurality of first distribution holes (402) are evenly opened on the disc (401). A plurality of second distribution holes (403) are also opened on the disc (401). A plurality of sealing components (6) are provided inside the disc (401). Each sealing component (6) is used to control the opening and closing of the corresponding second distribution hole (403). A driving component (7) is also provided on the outer shell (1). The driving component (7) is used to drive the disc (401) to rotate.

2. The tail gas purification and recovery device for a cyanuric acid-ammonium sulfate co-production system according to claim 1, characterized in that, The disk (401) has a cavity (404) inside, the sealing component (6) is located inside the cavity (404), and the second uniformly distributed holes (403) are concentrated in a fan-shaped area on the disk (401).

3. The tail gas purification and recovery device for a cyanuric acid-ammonium sulfate co-production system according to claim 1, characterized in that, The sealing assembly (6) includes a limiting frame (601), a baffle (602) is provided inside the limiting frame (601), a groove (603) is provided on one side of the inner side of the limiting frame (601), a slider (604) is fixed on the baffle (602), the slider (604) is slidably disposed in the groove (603), an air passage (605) is provided on the outer side of the limiting frame (601), an air inlet pipe (606) is fixed at the outward end of the air passage (605), the corresponding side wall of the slider (604) closes the inward side of the air passage (605), and multiple air inlets (606) are interconnected.

4. The tail gas purification and recovery device for a cyanuric acid-ammonium sulfate co-production system according to claim 1, characterized in that, The drive assembly (7) includes a connecting frame (701) fixed to the top of the outer shell (1), a rotary drive structure (702) fixed on the connecting frame (701), a hollow shaft (703) fixed to the output end of the rotary drive structure (702), one end of the hollow shaft (703) passing through the disk (401) and extending below it, and the hollow shaft (703) being fixedly connected to the disk (401).

5. The tail gas purification and recovery device for a cyanuric acid-ammonium sulfate co-production system according to claim 4, characterized in that, The hollow shaft (703) is provided with a main air pipe (607). The upper end of the main air pipe (607) passes through the hollow shaft (703) and extends to its outer side. The upper end of the main air pipe (607) is connected to an external air source. The air source is used to change the air pressure inside the main air pipe (607). The lower end of the main air pipe (607) is fixed with a branch pipe (608). One end of the branch pipe (608) is connected to one of the air inlets (606).

6. The tail gas purification and recovery device for a cyanuric acid-ammonium sulfate co-production system according to claim 4, characterized in that, A guide assembly (8) is also provided on the lower inner side of the outer shell (1). The guide assembly (8) includes an arc frame (801) with an L-shaped cross section. An outer sliding tube (802) is fixed in the middle of the arc frame (801). A guide rod (803) is fixedly connected to the bottom of the disc (401). The outer sliding tube (802) is sleeved on the outside of the guide rod (803). The outer sliding tube (802) is slidably mounted on the guide rod (803). An air inlet chamber (804) is opened on the lower inner side of the outer sliding tube (802). A telescopic air pipe (805) is fixed on the air inlet chamber (804). One end of the telescopic air pipe (805) is connected to the bottom end of the main air pipe (607). The top of the air inlet chamber (804) is guided by... The bottom end of the guide rod (803) is closed. Several adjustment frames (806) are distributed in a circle inside the arc frame (801). A rotating shaft (807) is rotatably connected inside the adjustment frame (806). A torsion spring (808) is sleeved on the outside of the rotating shaft (807). One end of the torsion spring (808) is fixed to the outer wall of the rotating shaft (807). One end of the torsion spring (808) is fixedly connected to the corresponding wall of the adjustment frame (806). A flexible cloth is wound around the outside of the rotating shaft (807). One end of the flexible cloth is fixedly connected to the surface of the rotating shaft (807). One end of multiple flexible cloths is fixed to the same guide cloth (809). The guide cloth (809) is fan-shaped. One end of the guide cloth (809) is fixedly connected to the outside of the hollow shaft (703).

7. The tail gas purification and recovery device for a cyanuric acid-ammonium sulfate co-production system according to claim 3, characterized in that, Two magnet blocks (609) are fixed on the limiting frame (601), and the slider (604) is made of ferromagnetic material.

8. The tail gas purification and recovery device for a cyanuric acid-ammonium sulfate co-production system according to claim 3, characterized in that, The baffle (602) has a connecting hole (610) at one end. When the connecting hole (610) is coaxially aligned with the second uniformly distributed holes (403) on the upper and lower sides of the disk (401), the gas can pass through the corresponding second uniformly distributed holes (403). When the connecting hole (610) is not coaxially aligned with the second uniformly distributed holes (403) on the upper and lower sides, the gas cannot pass through the corresponding second uniformly distributed holes (403).

9. A method for purifying and recovering tail gas from a cyanuric acid-ammonium sulfate co-production system, applied to the tail gas purification and recovery device of the cyanuric acid-ammonium sulfate co-production system according to any one of claims 1-8, characterized in that, Includes the following steps: The sealing component (6) controls the opening of the corresponding second uniformly distributed hole (403), so that the exhaust gas discharged from the cyanuric acid heating device can pass through the first uniformly distributed hole (402) and the second uniformly distributed hole (403) at the same time, and the drive component (7) controls the rotation of the disk (401).

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