Tail gas absorption equipment and absorption method for dibromohydantoin production

Abstract

The invention discloses tail gas absorption equipment for dibromohydantoin production and an absorption method, and relates to the technical field of tail gas absorption. The device comprises a spraying tower, an air inlet is formed in the lower portion of the left side of the spraying tower, and a steam heat exchange assembly is arranged on the left side of the air inlet; a plurality of groups of filler assemblies are arranged in the spraying tower, a demisting layer is arranged above the filler assemblies, each filler assembly comprises a filler bowl rotationally mounted in the spraying tower, and each filler bowl is composed of two groups of conical barrels. By arranging the steam heat exchange assembly, heat of tail gas is fully absorbed, the temperature of the tail gas meets the spraying absorption requirement, the absorbed heat generates steam, the steam is introduced into the filler assembly in the spraying tower, filler below the filler assembly is subjected to high-pressure steam washing, and the filler assembly above normally absorbs the tail gas; equipment shutdown or new equipment addition is not needed, the tail gas treatment efficiency is high, redundant heat in the tail gas can be fully utilized, and the energy utilization rate is high.

Description

Technical Field

[0001] The present invention relates to the technical field of tail gas absorption, and particularly relates to a tail gas absorption device and an absorption method for the production of dibromo hydantoin. Background Art

[0002] Dibromo hydantoin is an important organic chemical, which is widely used in chemical synthesis, pesticide intermediates, and as a solvent, etc. The production of dibromo hydantoin is usually carried out through a halogenation reaction, which involves the use of chemical substances such as hydrogen chloride or hydrogen bromide, and may generate certain harmful gases and waste gases. During the production process of dibromo hydantoin, the emission of waste gas is inevitable. The waste gas may contain harmful substances such as bromides, chlorides, and organic solvents. If not treated, it may cause serious pollution to the environment, affect the surrounding air quality, and pose a potential hazard to human health.

[0003] In a Chinese patent (publication number: CN209501242U), a tail gas treatment device for bromochloro hydantoin drying is disclosed, which includes an induced draft fan, a primary treatment device, a secondary treatment device, and a circulation device; the primary treatment device includes a condensation tower, which is connected between the condensation tower and the induced draft fan, the upper end of the condensation tower is connected to the secondary treatment device, and the lower end is connected to a condensate storage tank; the secondary treatment device includes an absorption tower, an absorption liquid spraying device is arranged above the absorption tower, the lower part of the absorption tower is connected to an absorption liquid storage tank, and a reaction liquid input port is arranged on the absorption liquid storage tank; the circulation device includes a cold circulation pump, one end of the cold circulation pump is connected to the condensate storage tank and the absorption liquid storage tank, the other end is connected to a PH detection device, one end of the PH detection device is connected to the absorption tower, and the other end is connected to a reaction kettle for producing bromochloro hydantoin.

[0004] The following technical problems exist in the actual use of this patent and the prior art: 1. In the synthesis reaction of dibromo hydantoin, the tail gas temperature range is usually between 120°C and 180°C. This is because, during the reaction process, the reaction between ethylene and bromine gas generally requires a relatively high temperature to promote the reaction. Usually, the temperature of the reactor is controlled at about 150°C, and the temperature of the tail gas after the reaction is usually similar to the temperature in the reactor. Some of the heat in the tail gas needs to be cooled down by a cooling system. However, both the above patent and the prior art need to cool the tail gas to reach the optimal absorption temperature, and the temperature generated by the tail gas cannot be fully utilized, resulting in low energy utilization rate.

[0005] 2. The tail gas of dibromohydantoin is mainly absorbed by spraying. The packing in the spraying tower is usually used to increase the contact area between gas and liquid to improve the absorption effect. During operation, the packing may reduce its effectiveness due to reasons such as accumulation of pollutants, solid precipitation, scaling, or surface oil stains. Therefore, regular packing regeneration is necessary to ensure the efficient operation of the tower. Currently, when regenerating the packing, the equipment requires a long downtime, and special equipment is needed to regenerate the packing, seriously affecting the tail gas absorption efficiency. Or two spraying towers are used alternately, but this method has a high equipment cost and a large floor area. Summary of the Invention

[0006] The purpose of the present invention is to provide a tail gas absorption device and absorption method for the production of dibromohydantoin to solve the above problems.

[0007] The present invention specifically adopts the following technical solutions to achieve the above purpose: A tail gas absorption device for the production of dibromohydantoin includes a spraying tower. An air inlet is opened below the left side of the spraying tower, and a steam heat exchange component is arranged on the left side of the air inlet. A plurality of packing components are arranged inside the spraying tower. A demisting layer is arranged above the packing components. The packing component includes a packing bowl rotatably installed inside the spraying tower. The packing bowl is composed of two conical cylinders. A plurality of smoke passing openings are annularly arranged on the outer side of the conical cylinder. The smoke passing openings can be opened and closed. The width of the smoke passing openings is smaller than the diameter of the packing. A guide frame is arranged inside the packing bowl. An inner shaft rod is slidably connected inside the guide frame. Spraying discs are arranged at the top and bottom of the inner shaft rod. Two bottom trays are arranged in the middle of the inner shaft rod. An outer skirt net is arranged between the bottom tray and the inner wall of the packing bowl. Plugs are arranged on the outer side of the spraying disc. A plurality of liftable spraying joints and steam joints are arranged inside the spraying tower. The steam joints are communicated with the steam heat exchange component.

[0008] Further, a sealing skirt is arranged on the outer side of the conical cylinder to block the smoke passing openings.

[0009] Further, the gravity of the sealing skirt is greater than the internal gas pressure in the spraying tower.

[0010] Further, an elastic inner rod is arranged inside the sealing skirt. The bottom tray is connected to the sealing skirt through a pull rope.

[0011] Further, a plurality of nozzles are arranged on the side of the spraying disc close to the bottom tray.

[0012] Furthermore, external brackets are provided on both sides of the spray tower, and a telescopic cylinder is fixedly installed on the outer side of the external bracket, and a mounting rod is fixedly installed on the telescopic end of the telescopic cylinder, and a plurality of groups of sliding rods are fixedly installed on the side of the mounting rod close to the spray tower, and the sliding rods are arranged corresponding to the spray joint and the steam joint, and a plurality of groups of sliding holes are opened on both sides of the spray tower, and the sliding rods are sealingly slidably connected in the sliding holes, and a connecting rod is hinged at one end of the sliding rod close to the inside of the spray tower, and the other end of the connecting rod is hinged to the corresponding spray joint and steam joint.

[0013] Furthermore, the steam heat exchange component includes a heat exchange tank, which is arranged on the left side of the air inlet. The interior of the heat exchange tank is provided with an air intake chamber, a steam heat exchange chamber and an exhaust chamber from left to right, and the exhaust chamber is connected to the air inlet. A plurality of groups of heat exchange tubes are arranged inside the steam heat exchange chamber, and both ends of the heat exchange tubes are respectively connected to the air intake chamber and the exhaust chamber. A water inlet pipe is arranged at the bottom of the steam heat exchange chamber, and a pressure pump is arranged at the top of the steam heat exchange chamber, and the pressure pump is connected to the steam joint through an air pressure pipe.

[0014] Furthermore, a plurality of rotating motors are fixedly mounted on the outer side of the spray tower, the output ends of the rotating motors are connected to the stuffing bowls, a plurality of sealing rings are arranged on the inner wall of the spray tower, the sealing rings are arranged corresponding to the stuffing bowls, and an observation port is arranged on the outer side of the spray tower, the observation port is arranged corresponding to the stuffing bowls.

[0015] Furthermore, an exhaust pipe is provided on the top of the spray tower, a smoke exhaust fan is provided at the air outlet of the exhaust pipe, a drain valve is provided at the bottom of the spray tower, the drain valve is lower than the air inlet, and the spray joint is connected with the external absorption liquid through the spray liquid pipe.

[0016] A tail gas absorption method for producing dibromohydantoin comprises the following steps: S1. Tail gas absorption: Tail gas enters the steam heat exchange component and is cooled to 100°C, and then enters the spray tower. The upper spray plate sprays the absorption liquid. After the tail gas passes through the packing component, the upper part of the packing component participates in the tail gas absorption, and the acid gas in it is absorbed. The excess spray liquid falls into the bottom of the spray tower for collection. The remaining tail gas passes through the demisting layer to remove excess water vapor, and then is discharged from the spray tower; S2. Packing regeneration: The pure water in the steam heat exchange component absorbs the heat of the exhaust gas and is converted into steam. The steam is pressurized and enters the lower part of the packing component through the spray plate placed below. The packing in the lower part is flushed by high-pressure steam. After flushing, the packing component is turned over and the packing is flushed with the absorption liquid to complete the packing regeneration.

[0017] The beneficial effects of the present invention are as follows: 1. Through the setting of the steam heat exchange component, the present invention fully absorbs the heat of the tail gas, making the temperature of the tail gas meet the requirements of spray absorption. Moreover, the absorbed heat generates steam, which is introduced into the packing component in the spray tower to perform high-pressure steam flushing on the packing below the packing component, while the packing component above normally absorbs the tail gas. There is no need to stop the equipment or add new equipment, with high tail gas treatment efficiency and full utilization of the excess heat in the tail gas, resulting in high energy utilization rate.

[0018] 2. Through the setting of the packing bowl and the inner shaft rod, the present invention only needs to control the flipping of the packing bowl to achieve the switching of the upper and lower packings. The upper packing is communicated with the spray tank, and the lower packing is sealed. The structure is simple, and the packing bowl is composed of two groups of conical cylinders, with the packing distributed in a conical shape. The conical distribution can increase the uniformity of the contact between the gas flow and the liquid in the tower. The conical design enables the gas to be gradually covered by the liquid during the upward movement in the tower, forming a more uniform gas-liquid contact surface, thereby improving the absorption efficiency or reaction efficiency.

[0019] 3. By mixing steam with the tail gas, the present invention can help dilute the harmful components in the tail gas, avoid too high a concentration of acidic gases, which helps reduce the corrosiveness of the acid gas in the tail gas and improve the operation stability of the absorption tower. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is the overall structural schematic diagram of the present invention; Figure 2 is the structural schematic diagram of the spray tower of the present invention Figure 1 ; Figure 3 is the structural schematic diagram of the spray tower of the present invention Figure 2 ; Figure 4 is the sectional structural schematic diagram of the spray tower of the present invention; Figure 5 is the structural schematic diagram of the lifting structure of the spray joint of the present invention; Figure 6 is the three-dimensional structural schematic diagram of the packing component of the present invention; Figure 7 is the sectional structural schematic diagram of the packing component of the present invention; Figure 8 is the structural schematic diagram of the packing bowl of the present invention; Figure 9 is the structural schematic diagram of the inner shaft rod of the present invention; Figure 10 is the sectional structural schematic diagram of the steam heat exchange component of the present invention.

[0021] 1. Steam heat exchange component; 11. Heat exchange tank; 12. Air inlet chamber; 13. Steam heat exchange chamber; 14. Exhaust chamber; 15. Heat exchange tube; 16. Water inlet pipe; 17. Pressure pump; 2. Spray tower; 21. Air inlet; 22. Drain valve; 23. Exhaust pipe; 24. Sealing ring; 25. Observation port; 3. Smoke exhaust fan; 4. External bracket; 41. Telescopic cylinder; 42. Mounting rod; 43. Sliding rod; 44. Connecting rod; 5. Filling bowl; 51. Rotating motor; 52. Smoke outlet; 53. Guide frame; 6. Spray joint; 61. Spray liquid pipe; 7. Steam joint; 71. Air pressure pipe; 8. Demisting layer; 9. Inner shaft; 91. Spray tray; 92. Bottom tray; 93. Plug; 94. Spray head; 95. Outer skirt net; 96. Pull rope; 10. Sealing skirt. DETAILED DESCRIPTION

[0022] To make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0023] Embodiment 1, as Figures 1 - 10 As shown, a tail gas absorption device for dibromohydantoin production includes a spray tower 2, an air inlet 21 is opened at the lower left side of the spray tower 2, and a steam heat exchange component 1 is arranged on the left side of the air inlet 21; A plurality of packing components are arranged inside the spray tower 2, a demisting layer 8 is arranged above the packing components, the packing components include a packing bowl 5 rotatably mounted inside the spray tower 2, the packing bowl 5 is composed of two groups of conical cylinders, a plurality of smoke ports 52 are annularly opened on the outer side of the conical cylinder, the smoke ports 52 can be opened and closed, the width of the smoke ports 52 is smaller than the diameter of the packing, a guide frame 53 is arranged inside the packing bowl 5, an inner shaft 9 is slidably connected inside the guide frame 53, a spray plate 91 is arranged at the top and bottom ends of the inner shaft 9, two groups of bottom trays 92 are arranged in the middle of the inner shaft 9, an outer skirt net 95 is arranged between the bottom tray 92 and the inner wall of the packing bowl 5; A plug 93 is provided on the outside of the spray plate 91 , and a plurality of groups of liftable spray joints 6 and steam joints 7 are provided inside the spray tower 2 , and the steam joint 7 is connected to the steam heat exchange component 1 .

[0024] Furthermore, an exhaust pipe 23 is provided at the top of the spray tower 2, a smoke exhaust fan 3 is provided at the air outlet end of the exhaust pipe 23, a drain valve 22 is provided at the bottom of the spray tower 2, the drain valve 22 is lower than the air inlet 21, and the spray joint 6 is connected to the external absorption liquid through the spray liquid pipe 61.

[0025] During use, the tail gas first passes through the steam heat exchange component 1 and is cooled. At the same time, the pure water inside the steam heat exchange component 1 absorbs heat and is boiled to generate steam. The cooling temperature of the dibromohydantoin tail gas should be controlled between 80°C and 100°C. Therefore, 100°C can also meet the absorption requirements. After the tail gas enters the spray tower 2 through the air inlet 21, it enters the packing bowl 5 through the lower smoke passing port 52. It should be noted that the space between the bottom tray 92 and the spray tray 91 stores the packing, and only half of the space is filled with the packing. Therefore, there is enough spraying distance between the upper spray tray 91 and the packing. The diameter of the packing is greater than the distance between the upper spray tray 91 and the packing bowl 5. Therefore, the packing is stacked in a conical shape on the upper bottom tray 92, and the outer skirt net 95 at the edge of the upper bottom tray 92 unfolds to support the packing. There is a small distance between the lower spray tray 91 and the bottom end of the packing bowl 5, and the packing cannot pass through this distance. The lower bottom tray 92 presses against the inner wall of the packing bowl 5, and a sealed space is formed between the lower bottom tray 92 and the spray tray 91. The outer skirt net 95 at the edge of the lower bottom tray 92 is straightened and closely attached to the inner wall of the packing bowl 5; Therefore, after the tail gas enters the packing bowl 5, it will enter the upper packing through the upper outer skirt net 95. The acidic gas in the tail gas is absorbed by the absorption liquid on the packing. The absorbed tail gas is discharged through the distance between the upper spray tray 91 and the packing bowl 5, and then enters another group of packing components to continue to be absorbed. After complete absorption, the tail gas removes water vapor through the demisting layer 8 and is finally discharged through the exhaust pipe 23 and the exhaust fan 3; The washed absorption liquid falls on the top of the lower bottom tray 92 and is then discharged through the lower smoke passing port 52 and collected at the bottom of the spray tower 2; During absorption, steam enters the lower spray tray 91 and is then sprayed into the lower packing to wash the lower packing. Since the steam is high-pressure steam, the steam will first rush into the packing and then be discharged through the distance between the lower spray tray 91 and the bottom end of the packing bowl 5, ensuring that the high-pressure steam washing of the packing can be fully realized. Moreover, the steam after flushing will be mixed with the tail gas, which can help dilute the harmful components in the tail gas and avoid too high a concentration of acidic gas. This helps reduce the corrosiveness of the acid gas in the tail gas and improve the operation stability of the absorption tower.

[0026] After using for a period of time, first control the spray joint 6 and the steam joint 7 to move away from the spray tray 91, and then control the packing bowl 5 to turn over. The inner shaft rod 9 slides downward as a whole along the guide frame 53. The original upper packing falls to the lower part, and the original lower packing is changed to the upper part. After the turning is completed, control the spray joint 6 and the steam joint 7 to descend and connect with the upper plug 93 and the lower plug 93 respectively. At this time, do not enter the tail gas first. First, use the absorption liquid to wash the packing after high-pressure steam washing to ensure that the packing is completely clean. After the washing is completed, then introduce the tail gas.

[0027] Therefore, the present invention can make full use of the heat of the dibromohydantoin tail gas, and can use the heat to regenerate the multi-packing material, which can greatly simplify the overall process and improve the process efficiency.

[0028] Embodiment 2, on the basis of the above embodiment, further includes that a sealing skirt 10 is arranged outside the conical cylinder, and the sealing skirt 10 blocks the smoke passing opening 52.

[0029] Further, the gravity of the sealing skirt 10 is greater than the internal gas pressure of the spray tower 2.

[0030] The lower sealing skirt 10 bends downward under the action of gravity, so that the lower smoke passing opening 52 is opened. The upper sealing skirt 10 presses on the upper smoke passing opening 52 under the action of gravity. Since the gravity of the sealing skirt 10 is greater than the internal gas pressure of the spray tower 2, the tail gas enters the packing bowl 5 through the lower smoke passing opening 52 and then enters the upper packing, and will not directly discharge from the upper smoke passing opening 52.

[0031] Embodiment 3, on the basis of the above embodiment, further includes that an elastic inner rod is arranged inside the sealing skirt 10, and the bottom tray 92 is connected to the sealing skirt 10 through a pull rope 96.

[0032] Compared with the previous embodiment, this embodiment provides another control structure for the smoke passing opening 52. After the packing bowl 5 is turned over, the inner shaft rod 9 descends under the action of gravity. The upper bottom tray 92 descends and tightly pulls the upper sealing skirt 10 to stick to the outside of the packing bowl 5 through the pull rope 96, blocking the upper smoke passing opening 52. The lower bottom tray 92 descends and relaxes the pull rope 96, and the elastic inner rod makes the lower sealing skirt 10 quickly turn downward, with a better opening and closing effect.

[0033] Embodiment 4, on the basis of the above embodiment, further includes that multiple groups of nozzles 94 are arranged on one side of the spray tray 91 close to the bottom tray 92. Through the arrangement of the multiple groups of nozzles 94, the spraying of the absorption liquid is made more uniform.

[0034] Embodiment 5, on the basis of the above embodiment, further includes that outer brackets 4 are arranged on both sides of the spray tower 2. A telescopic cylinder 41 is fixedly installed on the outside of the outer bracket 4. The telescopic end of the telescopic cylinder 41 is fixedly installed with a mounting rod 42. Multiple groups of sliding rods 43 are fixedly installed on one side of the mounting rod 42 close to the spray tower 2. The sliding rods 43 are arranged corresponding to the spray joints 6 and the steam joints 7. Multiple groups of sliding holes are opened on both sides of the spray tower 2. The sliding rods 43 are hermetically slidably connected in the sliding holes. One end of the sliding rod 43 close to the inside of the spray tower 2 is hinged with a connecting rod 44, and the other end of the connecting rod 44 is hinged with the corresponding spray joint 6 and steam joint 7.

[0035] By controlling the operation of the telescopic cylinder 41, the telescopic cylinder 41 drives the mounting rod 42 to move, and the mounting rod 42 drives the sliding rod 43 to slide along the sliding hole. Since the two ends of the sliding rod 43 are inserted into or away from the spray tower 2 at the same time, the two groups of sliding rods 43 can drive the spray joint 6 and the steam joint 7 to lift through the two groups of connecting rods 44. With this structural arrangement, there is no need to reserve a driving space inside the spray tower 2, and only the lifting space for the spray joint 6 and the steam joint 7 needs to be reserved, making the structure compact.

[0036] Embodiment Six, on the basis of the above embodiment, further includes that the steam heat exchange assembly 1 includes a heat exchange tank 11. The heat exchange tank 11 is arranged on the left side of the air inlet 21. Inside the heat exchange tank 11, an air inlet chamber 12, a steam heat exchange chamber 13 and an exhaust chamber 14 are successively arranged from left to right. The exhaust chamber 14 is communicated with the air inlet 21. A plurality of heat exchange tubes 15 are arranged inside the steam heat exchange chamber 13. The two ends of the heat exchange tubes 15 are respectively communicated with the air inlet chamber 12 and the exhaust chamber 14. A water inlet pipe 16 is arranged at the bottom of the steam heat exchange chamber 13, and a pressure pump 17 is arranged at the top of the steam heat exchange chamber 13. The pressure pump 17 is communicated with the steam joint 7 through a pneumatic pipe 71.

[0037] The tail gas first enters the air inlet chamber 12, and then enters the heat exchange tubes 15. The pure water in the steam heat exchange chamber 13 absorbs heat. Since the temperature of the tail gas is about 150 °C, by setting the length of the heat exchange tubes 15 and the flow rate of the tail gas, the pure water in the steam heat exchange chamber 13 is heated and evaporated. Then, through the pressurization of the pressure pump 17, the high-pressure steam enters the lower spray tray 91 through the pneumatic pipe 71 and the steam joint 7.

[0038] Embodiment Seven, on the basis of the above embodiment, further includes that a plurality of rotary motors 51 are fixedly installed on the outer side of the spray tower 2. The output end of the rotary motor 51 is connected to the packing bowl 5. A plurality of sealing rings 24 are arranged on the inner wall of the spray tower 2. The sealing rings 24 are arranged corresponding to the packing bowl 5. An observation port 25 is arranged on the outer side of the spray tower 2. The observation port 25 is arranged corresponding to the packing bowl 5.

[0039] Through the arrangement of the sealing ring 24, the sealing performance between the packing bowl 5 and the inner wall of the spray tower 2 can be improved. Through the arrangement of the observation port 25, it is convenient to observe the internal situation of the spray tower 2.

[0040] Embodiment Eight, a method for absorbing tail gas in the production of dibromohydantoin, includes the following steps: S1. Tail gas absorption: The tail gas enters the steam heat exchange assembly 1 and is cooled to 100 °C, and then enters the spray tower 2. The upper spray tray 91 sprays the absorption liquid. After the tail gas passes through the packing assembly, the upper half of the packing assembly participates in the tail gas absorption, and the acidic gas therein is absorbed. The excess spray liquid falls into the bottom of the spray tower 2 for collection. The remaining tail gas passes through the demisting layer 8 to remove the excess water vapor, and then is discharged from the spray tower 2; S2. Packing regeneration: The pure water in the steam heat exchange component 1 absorbs the heat of the tail gas and is converted into steam. The steam is pressurized and enters the lower half of the packing component through the spray tray 91 placed below. The packing in the lower half is rinsed by the high-pressure steam. After rinsing, the packing component is flipped, and the packing is rinsed with the absorption liquid to complete the packing regeneration.

[0041] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An exhaust gas absorption device for the production of dibromohydantoin, comprising a spray tower (2), characterized in that, An air inlet (21) is provided at the lower part on the left side of the spray tower (2), and a steam heat exchange component (1) is arranged on the left side of the air inlet (21). A plurality of packing components are arranged inside the spray tower (2). An atomizing layer (8) is arranged above the packing components. The packing component includes a packing bowl (5) rotatably installed inside the spray tower (2). The packing bowl (5) is composed of two conical cylinders. A plurality of smoke passing openings (52) are annularly arranged on the outer side of the conical cylinder. The smoke passing openings (52) can be opened and closed. The width of the smoke passing openings (52) is smaller than the diameter of the packing. A guide frame (53) is arranged inside the packing bowl (5). An inner shaft rod (9) is slidably connected inside the guide frame (53). Spray trays (91) are arranged at both the top end and the bottom end of the inner shaft rod (9). Two bottom trays (92) are arranged in the middle of the inner shaft rod (9). An outer skirt net (95) is arranged between the bottom tray (92) and the inner wall of the packing bowl (5). Plugs (93) are arranged on the outer side of the spray trays (91). A plurality of liftable spray joints (6) and steam joints (7) are arranged inside the spray tower (2). The steam joints (7) are communicated with the steam heat exchange component (1).

2. The tail gas absorption device for the production of dibromohydantoin according to claim 1, characterized in that, A sealing skirt (10) is arranged on the outer side of the conical cylinder, and the sealing skirt (10) covers the smoke passing openings (52).

3. The tail gas absorption device for the production of dibromohydantoin according to claim 2, characterized in that, The gravity of the sealing skirt (10) is greater than the air pressure inside the spray tower (2).

4. The tail gas absorption device for the production of dibromohydantoin according to claim 2, characterized in that, An elastic inner rod is arranged inside the sealing skirt (10), and the bottom tray (92) is connected with the sealing skirt (10) through a pull rope (96).

5. The tail gas absorption device for the production of dibromohydantoin according to claim 1, characterized in that, A plurality of nozzles (94) are arranged on one side of the spray tray (91) close to the bottom tray (92).

6. The tail gas absorption device for the production of dibromohydantoin according to claim 1, characterized in that, Outer brackets (4) are arranged on both sides of the spray tower (2). A telescopic cylinder (41) is fixedly installed on the outer side of the outer bracket (4). An installation rod (42) is fixedly installed at the telescopic end of the telescopic cylinder (41). A plurality of sliding rods (43) are fixedly installed on the side of the installation rod (42) close to the spray tower (2). The sliding rods (43) are correspondingly arranged with the spray joints (6) and the steam joints (7). A plurality of sliding holes are arranged on both sides of the spray tower (2). The sliding rods (43) are hermetically slidably connected in the sliding holes. One end of the sliding rod (43) close to the inside of the spray tower (2) is hinged with a connecting rod (44), and the other end of the connecting rod (44) is hinged with the corresponding spray joint (6) and steam joint (7).

7. An off-gas absorption device for the production of dibromohydantoin according to claim 1, characterized in that, The steam heat exchange component (1) includes a heat exchange tank (11). The heat exchange tank (11) is arranged on the left side of the air inlet (21). An air inlet chamber (12), a steam heat exchange chamber (13) and an exhaust chamber (14) are sequentially arranged inside the heat exchange tank (11) from left to right. The exhaust chamber (14) is communicated with the air inlet (21). A plurality of heat exchange tubes (15) are arranged inside the steam heat exchange chamber (13). Both ends of the heat exchange tube (15) are respectively communicated with the air inlet chamber (12) and the exhaust chamber (14). A water inlet pipe (16) is arranged at the bottom of the steam heat exchange chamber (13). A pressure pump (17) is arranged at the top of the steam heat exchange chamber (13). The pressure pump (17) is communicated with the steam joint (7) through a pneumatic pipe (71).

8. An exhaust gas absorption device for the production of dibromohydantoin according to claim 7, characterized in that, A plurality of rotating motors (51) are fixedly mounted on the outside of the spray tower (2), and the output ends of the rotating motors (51) are connected to the filling bowl (5). A plurality of sealing rings (24) are arranged on the inner wall of the spray tower (2), and the sealing rings (24) are arranged corresponding to the filling bowl (5). An observation port (25) is arranged on the outside of the spray tower (2), and the observation port (25) is arranged corresponding to the filling bowl (5).

9. An exhaust gas absorption device for the production of dibromohydantoin according to claim 8, characterized in that, An exhaust pipe (23) is arranged at the top of the spray tower (2), a smoke exhaust fan (3) is arranged at the air outlet end of the exhaust pipe (23), a liquid discharge valve (22) is arranged at the bottom of the spray tower (2), the liquid discharge valve (22) is lower than the air inlet (21), and the spray joint (6) is connected to the external absorption liquid through the spray liquid pipe (61).

10. A method for absorbing tail gas in the production of dibromohydantoin, which uses a tail gas absorption device for the production of dibromohydantoin as described in any one of claims 1-9, characterized in that, The following steps are involved: S1, tail gas absorption: the tail gas enters the steam heat exchange component (1) and is cooled to 100°C, and then enters the spray tower (2). The upper spray plate (91) sprays the absorption liquid. After the tail gas passes through the packing component, the upper part of the packing component participates in the tail gas absorption, and the acid gas therein is absorbed. The excess spray liquid falls into the bottom of the spray tower (2) and is collected. The remaining tail gas passes through the demisting layer (8) to remove excess water vapor, and then is discharged from the spray tower (2); S2. Packing regeneration: The pure water in the steam heat exchange component (1) absorbs the heat of the exhaust gas and is converted into steam. The steam is pressurized and enters the lower part of the packing component through the spray plate (91) placed below. The packing in the lower part is flushed by the high-pressure steam. After flushing, the packing component is turned over and the packing is flushed by the absorption liquid to complete the packing regeneration.

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