Tail gas treatment device for chemical dichlorobenzonitrile production

Abstract

The invention discloses a tail gas treatment device for chemical dichlorobenzonitrile production, which relates to the technical field of chemical dichlorobenzonitrile production and comprises a spray tower, a spray mechanism and an airflow retarding mechanism. Acidic tail gas enters the spray tower from the gas inlet, and is sprayed by an alkaline solution of the spray mechanism to remove pollutants; the airflow retarding mechanism intermittently controls the tail gas flowing speed through the staggered design of air holes of a fixed plate disc and a rotating plate disc, and the contact time of tail gas and spraying liquid is prolonged; the rotational flow plate further enhances the rotational flow effect of the tail gas and improves the spraying treatment efficiency; the intermittent transmission assembly and the angle adjusting assembly can adjust the flow of the tail gas and the inclination angle of the rotational flow plate according to the communication state of the air holes, and it is ensured that harmful substances in the tail gas are fully absorbed. The device has the characteristics of efficient purification, energy conservation, automatic adjustment and the like, and is suitable for tail gas treatment in chemical production.

Description

Technical Field

[0001] The invention relates to the technical field of chemical dichlorobenzonitrile production, in particular to a tail gas treatment device used in chemical dichlorobenzonitrile production. Background Art

[0002] Dichlorobenzonitrile (DBN) is an organic compound with two chlorine atoms (—Cl) and a cyano group (—CN) attached to the benzene ring. Its general chemical formula is C7H3Cl2N. Depending on the position of the chlorine atoms, it exists in various isomers, the most common of which include 2,6-dichlorobenzonitrile, 3,4-dichlorobenzonitrile, and 2,4-dichlorobenzonitrile. 2,6-Dichlorobenzonitrile is the most important industrial product, primarily used in the synthesis of herbicides (such as dichlorvos) and pharmaceuticals. Its production involves chlorination and cyanidation processes, requiring careful attention to safety and environmental issues.

[0003] In the production of dichlorobenzonitrile (such as 2,6-dichlorobenzonitrile), tail gas primarily originates from processes such as chlorination, cyanidation, and solvent recovery. During the chlorination process, acidic gases (such as HCl and Cl₂) are generated. Existing technologies often utilize packed towers or spray towers to spray alkaline solutions to purify and absorb these tail gases. However, these spray towers lack a retarder, resulting in high gas flow rates and short residence time within the spray tower, which compromises the effectiveness of tail gas spray treatment. Therefore, there is an urgent need for a tail gas treatment device for chemical dichlorobenzonitrile production to address these issues. Summary of the Invention

[0004] The purpose of the embodiments of the present invention is to provide a tail gas treatment device for the production of dichlorobenzonitrile in the chemical industry to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A tail gas treatment device for use in the production of dichlorobenzonitrile in the chemical industry comprises: a spray tower, wherein the bottom of the spray tower is connected to a support base, an air inlet is provided on the side wall of the bottom of the spray tower, an air outlet is provided on the top of the spray tower, and a liquid outlet is provided at the bottom, and further comprises:

[0007] The motor is connected to the outer wall of the spray tower;

[0008] A filler plate is located inside the spray tower and connected to its inner wall;

[0009] A spray mechanism, one end of which is connected to the spray tower and the other end is connected to the output end of the motor, for spraying the alkaline liquid;

[0010] The air flow deceleration mechanism is used to slow down the flow speed of exhaust gas, and the air flow deceleration mechanism includes: a fixed plate plate, which is located inside the spray tower and connected thereto, and a plurality of groups of air holes 1 are opened on the fixed plate plate; a rotating plate plate is located at the bottom of the fixed plate plate and abuts against it, the rotating plate plate is rotatably connected to the spray tower, and a plurality of groups of air holes 2 are opened on the rotating plate plate; an intermittent transmission component, one end of which is connected to the spray mechanism and the other end is connected to the rotating plate plate, for driving the rotating plate plate to rotate intermittently; a fixed pipe, the top end of which is connected to the spray mechanism, the fixed pipe passes through the filler plate and is rotatably connected to it; a fixed frame, which is connected to the bottom end of the fixed pipe and is connected to the inside of it; a swirl plate, which is rotatably connected to the fixed frame, and the swirl plates are provided with a plurality of groups and are arranged in a circle with equal intervals; an angle adjustment component, one end of which is connected to the intermittent transmission component and the other end is connected to the swirl plate, for adjusting the inclination angle of the swirl plate.

[0011] As a further solution of the present invention: the spraying mechanism includes:

[0012] a liquid storage tank containing an alkaline solution;

[0013] A liquid pumping machine, wherein the input end is connected with the interior of the liquid storage tank;

[0014] A connecting pipe connected to the output end of the liquid pump;

[0015] A fixing ring is connected to the outer wall of the spray tower, and the connecting pipe passes through the fixing ring and is connected thereto;

[0016] A rotating frame is rotatably connected to the fixed ring and communicated with the interior of the connecting pipe, and the rotating frame is rotatably connected to the spray tower;

[0017] A spray pipe is connected to the interior of the rotating frame. The spray pipe is located inside the spray tower and on the top of the filler plate. An atomizing nozzle is provided at the bottom of the spray pipe.

[0018] The rotating assembly has one end connected to the output end of the motor and the other end connected to the rotating frame, and is used to drive the rotating frame to rotate.

[0019] As a further solution of the present invention: the rotating assembly includes:

[0020] Gear 1, connected to the output end of the motor;

[0021] The first gear ring is connected to the rotating frame and meshes with the first gear.

[0022] As a further solution of the present invention: the intermittent transmission assembly includes:

[0023] Rotating ring connected to the spray pipe;

[0024] a toothed ring connected to the rotating ring;

[0025] A missing gear is rotatably connected to the spray tower, and the gear teeth on the missing gear are meshed with the gear teeth on the missing gear ring;

[0026] Gear ring 2 is connected to the rotating plate and meshes with the gear teeth on the missing gear;

[0027] an abutment rod connected to the eccentric portion of the missing gear;

[0028] The spring piece is connected to the rotating ring and abuts against the abutting rod.

[0029] As a further solution of the present invention: the angle adjustment component includes:

[0030] A pneumatic assembly, one end of which is connected to the rotating ring and the other end is connected to the fixed pipe;

[0031] A connecting ring rod is connected to the pneumatic assembly, and the connecting ring rod is located inside the fixed frame;

[0032] The telescopic rod has a bottom end connected to the fixed frame and a top end connected to the connecting ring rod;

[0033] The spring has a bottom end connected to the fixed frame and a top end connected to the connecting ring rod;

[0034] Gear 2, connected to the swirl plate;

[0035] The tooth plate is connected to the connecting ring rod and meshes with the second gear.

[0036] As a further solution of the present invention: the pneumatic component includes:

[0037] a fixed cylinder connected to the rotating ring;

[0038] The sliding rod passes through the top of the fixed cylinder and is slidably connected thereto;

[0039] The first piston is located inside the fixed cylinder and is in sliding contact with the inner wall thereof, and the first piston is connected to the bottom end of the sliding rod;

[0040] an air pipe, one end of which is in communication with the interior of the bottom end of the fixed cylinder and the other end of which is in communication with the interior of the fixed pipe;

[0041] The second piston is located inside the fixed tube and is in sliding contact with the inner wall of the fixed tube. The second piston is connected to the connecting ring rod.

[0042] Compared with the prior art, the present invention has the following beneficial effects:

[0043] 1. The alkaline solution is evenly sprayed through the atomizing nozzle of the spray mechanism to react chemically with the harmful substances in the acidic tail gas, effectively removing pollutants;

[0044] 2. The airflow deceleration mechanism intermittently controls the exhaust gas flow rate through the staggered design of the air holes of the fixed plate and the rotating plate, prolonging the contact time between the exhaust gas and the spray liquid, and significantly improving the purification efficiency;

[0045] 3. The design of the swirl plate further enhances the swirl effect of the exhaust gas, causing the exhaust gas to form a vortex in the spray tower, further increasing the mixing effect of the exhaust gas and liquid, and ensuring that the harmful substances in the exhaust gas are fully absorbed;

[0046] 4. The intermittent transmission component and the angle adjustment component can adjust the exhaust gas flow and the inclination angle of the swirl plate according to the connectivity status of the air holes, ensuring the best treatment effect under different working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 The figure is a schematic structural diagram of a tail gas treatment device for the production of dichlorobenzonitrile in a chemical industry according to an embodiment of the present invention.

[0048] Figure 2 The figure is a cross-sectional view of a tail gas treatment device used in the production of dichlorobenzonitrile in the chemical industry according to an embodiment of the present invention.

[0049] Figure 3 The figure is a schematic diagram of the structural disassembly of a tail gas treatment device used in the production of dichlorobenzonitrile in the chemical industry according to an embodiment of the present invention.

[0050] Figure 4 It is a partial structural diagram of the spray mechanism and the air flow retarding mechanism in an embodiment of the present invention.

[0051] Figure 5 2 is a cross-sectional view of the spray mechanism in an embodiment of the present invention.

[0052] Figure 6 Schematic diagram of the structure of the intermittent transmission assembly in an embodiment of the present invention.

[0053] Figure 7 Schematic diagram of the structure of the angle adjustment assembly in an embodiment of the present invention.

[0054] Figure 8 for Figure 7 Cross-sectional view of the structure.

[0055] Figure 9 for Figure 8 A magnified schematic diagram of the structure at point A.

[0056] Figure 10 for Figure 8 A magnified schematic diagram of the structure at point B.

[0057] Figure: 1, spray tower; 2, air inlet; 3, air outlet; 4, liquid outlet; 5, inspection and observation port; 6, motor; 7, spray mechanism; 71, liquid storage tank; 72, liquid pump; 73, connecting pipe; 74, fixed ring; 75, rotating frame; 76, spray pipe; 77, rotating assembly; 771, gear 1; 772, gear ring 1; 8, air flow retarding mechanism; 81, fixed plate; 82, rotating plate; 83, intermittent transmission assembly; 84, fixed pipe; 85, fixed frame; 86, rotating Flow plate; 87, angle adjustment assembly; 831, rotating ring; 832, missing tooth ring; 833, missing gear; 834, gear ring 2; 835, abutment rod; 836, spring; 871, pneumatic assembly; 872, connecting ring rod; 873, telescopic rod; 874, spring; 875, gear 2; 876, gear plate; 8711, fixed cylinder; 8712, sliding abutment rod; 8713, piston 1; 8714, air pipe; 8715, piston 2; 9, filler plate; 10, support base. DETAILED DESCRIPTION

[0058] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0059] In the embodiment of the present invention, please refer to Figures 1 to 10 A tail gas treatment device for the production of dichlorobenzonitrile in the chemical industry comprises: a spray tower 1, the bottom of the spray tower 1 is connected to a support base 10, an air inlet 2 is provided on the side wall of the bottom of the spray tower 1, an air outlet 3 is provided on the top of the spray tower 1, and a liquid outlet 4 is provided at the bottom, and further comprises:

[0060] Motor 6, connected to the outer wall of the spray tower 1;

[0061] The packing plate 9 is located inside the spray tower 1 and connected to its inner wall;

[0062] A spray mechanism 7, one end of which is connected to the spray tower 1 and the other end of which is connected to the output end of the motor 6, is used to spray the alkaline liquid;

[0063] The airflow retarding mechanism 8 is used to slow down the flow speed of the exhaust gas. The airflow retarding mechanism 8 includes: a fixed plate 81, which is located inside the spray tower 1 and connected thereto, and the fixed plate 81 is provided with a plurality of groups of air holes 1; a rotating plate 82, which is located at the bottom of the fixed plate 81 and abuts against it, and the rotating plate 82 is rotatably connected to the spray tower 1, and the rotating plate 82 is provided with a plurality of groups of air holes 2; an intermittent transmission component 83, one end of which is connected to the spray mechanism 7 and the other end is connected to the rotating plate 82, for It drives the rotating plate 82 to rotate intermittently; the fixed pipe 84, the top of which is connected to the spray mechanism 7, passes through the filler plate 9 and is rotatably connected thereto; the fixed frame 85 is connected to the bottom end of the fixed pipe 84 and is in communication with the interior thereof; the swirl plate 86 is rotatably connected to the fixed frame 85, and the swirl plates 86 are provided in several groups and are arranged in a circle at equal intervals; the angle adjustment component 87, one end of which is connected to the intermittent transmission component 83, and the other end of which is connected to the swirl plate 86, is used to adjust the inclination angle of the swirl plate 86.

[0064] The acidic tail gas enters the spray tower 1 from the air inlet 2 and flows upward. The spray mechanism 7 sprays an alkaline solution to absorb the acidic tail gas. The treated tail gas flows out from the air outlet 3 and the sewage is discharged from the liquid outlet 4. The motor 6 works to drive the spray mechanism 7 to rotate, thereby achieving comprehensive spraying of the acidic tail gas. At the same time, the spray mechanism 7 drives the intermittent transmission component 83 and the fixed pipe 84 to rotate, and the fixed pipe 84 drives the swirl plate 86 to rotate, converting the linear kinetic energy of the tail gas into rotational kinetic energy, causing the tail gas to vortex, and at the same time increasing the residence time of the tail gas in the spray tower 1. In order to improve the spray treatment effect, the intermittent transmission component 83 drives the rotating plate 82 to rotate intermittently, so that the air hole 2 on the rotating plate 82 is intermittently connected with the air hole 1 on the fixed plate 81, so that the exhaust gas intermittently flows upward through the air hole 2 and the air hole 1, thereby increasing the residence time of the exhaust gas in the spray tower 1. At the same time, the intermittent transmission component 83 drives the angle adjustment component 87 to move, and the angle adjustment component 87 drives the swirl plate 86 to rotate. The inclination angle of the swirl plate 86 is adjusted according to the stop state of the exhaust gas, thereby changing the flow rate and swirl intensity of the exhaust gas.

[0065] As an embodiment of the present invention, please refer to Figures 1 to 5 , the spraying mechanism 7 includes:

[0066] Liquid storage tank 71, filled with alkaline solution;

[0067] The liquid pump 72 has an input end connected to the interior of the liquid storage tank 71;

[0068] The connecting pipe 73 is connected to the output end of the liquid pump 72;

[0069] The fixing ring 74 is connected to the outer wall of the spray tower 1, and the connecting pipe 73 passes through the fixing ring 74 and is connected thereto;

[0070] The rotating frame 75 is rotatably connected to the fixed ring 74 and communicates with the interior of the connecting pipe 73. The rotating frame 75 is rotatably connected to the spray tower 1;

[0071] The spray pipe 76 is connected to the interior of the rotating frame 75. The spray pipe 76 is located inside the spray tower 1 and on the top of the filler plate 9. An atomizing nozzle is provided at the bottom of the spray pipe 76.

[0072] The rotating assembly 77 has one end connected to the output end of the motor 6 and the other end connected to the rotating frame 75 for driving the rotating frame 75 to rotate.

[0073] The liquid pump 72 extracts the alkaline solution from the liquid storage tank 71, sends it into the rotating frame 75 through the connecting pipe 73, then enters the spray pipe 76, and finally is evenly sprayed out through the atomizing nozzle. The alkaline solution reacts chemically with the harmful substances in the exhaust gas to remove pollutants. The motor 6 drives the rotating component 77 to rotate, and the rotating component 77 drives the rotating frame 75 to rotate. The rotating frame 75 drives the spray pipe 76 to revolve around the center of the rotating frame 75, thereby achieving comprehensive spraying and absorption of the exhaust gas and improving the absorption effect.

[0074] As an embodiment of the present invention, please refer to Figures 1 to 5 , the rotating assembly 77 includes:

[0075] Gear 1 771 is connected to the output end of motor 6;

[0076] The gear ring 1 772 is connected to the rotating frame 75 and meshes with the gear 1 771 .

[0077] The motor 6 drives the gear 1 771 to rotate, the gear 1 771 drives the gear ring 1 772 to rotate, and the gear ring 1 772 drives the rotating frame 75 to rotate.

[0078] As an embodiment of the present invention, please refer to Figures 2 to 4 、 Figure 6 , the intermittent transmission assembly 83 includes:

[0079] Rotating ring 831 is connected to the spray pipe 76;

[0080] The toothless ring 832 is connected to the rotating ring 831;

[0081] The missing gear 833 is rotatably connected to the spray tower 1, and the gear teeth on the missing gear 833 are meshed with the gear teeth on the missing gear ring 832;

[0082] The second gear ring 834 is connected to the rotating plate 82 and meshes with the gear teeth on the missing gear 833;

[0083] The abutment rod 835 is connected to the eccentric portion of the missing gear 833;

[0084] The spring piece 836 is connected to the rotating ring 831 and abuts against the abutting rod 835 .

[0085] The spray pipe 76 drives the rotating ring 831 to rotate, and the rotating ring 831 drives the toothed ring 832 and the spring piece 836 to revolve around the center of the rotating frame 75. When the toothed ring 832 is not engaged with the toothed gear 833, the air hole 1 and the air hole 2 are offset, and the exhaust gas cannot move upward. When the spring piece 836 rotates to abut against the abutment rod 835, it squeezes the abutment rod 835, causing the toothed gear 833 to rotate. At the same time, the spring piece 836 is deformed, and the gear teeth on the toothed gear 833 are engaged with the gear teeth on the toothed ring 832. The toothed ring 832 drives the toothed gear 833 to rotate, and the toothed gear 833 drives the gear ring 2 834 to rotate. The gear ring 2 834 drives the rotating plate 82 to rotate, so that the air hole 1 is connected with the air hole 2, and the exhaust gas flows upward through the air hole 1 and the air hole 2. When the gear 833 rotates to no longer engage with the toothed ring 832, the air hole 1 and the air hole 2 return to the offset state.

[0086] As an embodiment of the present invention, please refer to Figures 2 to 4 、 Figures 6 to 10 , the angle adjustment component 87 includes:

[0087] Pneumatic assembly 871, one end of which is connected to the rotating ring 831 and the other end of which is connected to the fixed tube 84;

[0088] A connecting ring rod 872 is connected to the pneumatic assembly 871 and is located inside the fixed frame 85;

[0089] The telescopic rod 873 is connected to the fixed frame 85 at its bottom end and to the connecting ring rod 872 at its top end;

[0090] Spring 874, the bottom end of which is connected to the fixed frame 85, and the top end of which is connected to the connecting ring rod 872;

[0091] Gear 2 875 is connected to the swirl plate 86;

[0092] The tooth plate 876 is connected to the connecting ring rod 872 and meshes with the gear 2 875 .

[0093] The spring 836 deforms and squeezes the pneumatic assembly 871, which drives the connecting ring rod 872 downward. The spring 874 elastically deforms, and the telescopic rod 873 ensures the stable movement of the connecting ring rod 872. The connecting ring rod 872 drives the tooth plate 876 downward. The tooth plate 876 drives the second gear 875 to rotate, which in turn drives the swirl plate 86 to rotate, so that the gap between the two adjacent sets of swirl plates 86 becomes smaller, the exhaust flow through the filler plate 9 is reduced, the swirl intensity is increased, and the spray effect is improved. At this time, the air hole 1 and the air hole 2 are in a connected state.

[0094] When the missing gear 833 rotates to the point where it is no longer engaged with the missing tooth ring 832, the spring piece 836 rebounds to its original state, and the connecting ring rod 872 moves upward under the reaction force of the spring 874, thereby driving the tooth plate 876 to move upward, and the swirl plate 86 rotates in the opposite direction, so that the gap between the two adjacent groups of swirl plates 86 becomes larger, the exhaust flow through the filler plate 9 becomes larger, and the flow rate decreases, thereby ensuring the spraying effect, and at this time, the air hole 1 and the air hole 2 are in a misaligned state.

[0095] As an embodiment of the present invention, please refer to Figures 2 to 4 、 Figures 6 to 10 , the pneumatic assembly 871 includes:

[0096] The fixed cylinder 8711 is connected to the rotating ring 831;

[0097] The sliding rod 8712 passes through the top of the fixed cylinder 8711 and is slidably connected thereto;

[0098] Piston 1 8713 is located inside the fixed cylinder 8711 and slides against the inner wall thereof. Piston 1 8713 is connected to the bottom end of the sliding rod 8712;

[0099] An air pipe 8714, one end of which is in communication with the interior of the bottom end of the fixed cylinder 8711 and the other end of which is in communication with the interior of the fixed pipe 84;

[0100] The second piston 8715 is located inside the fixed tube 84 and is in sliding contact with the inner wall thereof. The second piston 8715 is connected to the connecting ring rod 872 .

[0101] The spring piece 836 deforms and squeezes the sliding rod 8712, which drives the piston 1 8713 to move downward, squeezing the gas in the fixed cylinder 8711 and the air pipe 8714. Under the action of the air pressure, the piston 2 8715 moves downward, driving the connecting ring rod 872 to move downward.

[0102] As an embodiment of the present invention, please refer to Figure 1 and Figure 3 , also includes:

[0103] The inspection and observation port 5 is opened on the side wall of the spray tower 1 and is located on the top of the packing plate 9.

[0104] The maintenance observation port 5 is provided to facilitate observation and maintenance of the interior of the spray tower 1 .

[0105] The working principle of the present invention is as follows: the liquid pump 72 extracts the alkaline solution in the liquid storage tank 71, sends it into the rotating frame 75 through the connecting pipe 73, then enters the spray pipe 76, and finally is evenly sprayed out through the atomizing nozzle. The acidic tail gas enters the interior of the spray tower 1 from the air inlet 2 and flows upward. The alkaline solution absorbs the acidic tail gas. The treated tail gas flows out from the air outlet 3, and the sewage is discharged from the liquid outlet 4.

[0106] When the toothless ring 832 is not engaged with the gear 833, the air hole 1 and the air hole 2 are in a misaligned state. When the gear teeth on the gear 833 are engaged with the gear teeth on the toothless ring 832, the air hole 1 and the air hole 2 are in a connected state.

[0107] The motor 6 drives the gear 1 771 to rotate, the gear 1 771 drives the gear ring 1 772 to rotate, the gear ring 1 772 drives the rotating frame 75 to rotate, and the rotating frame 75 drives the spray pipe 76 to revolve around the center of the rotating frame 75, thereby achieving comprehensive spraying and absorption of the exhaust gas and improving the absorption effect;

[0108] When the toothed ring 832 is not engaged with the gear 833, the air hole 1 and the air hole 2 are offset and the exhaust gas cannot move upward; the spray pipe 76 drives the rotating ring 831 to rotate, and the rotating ring 831 drives the toothed ring 832 and the spring piece 836 to revolve around the center of the rotating frame 75. When the spring piece 836 rotates to abut against the abutting rod 835, it squeezes the abutting rod 835, causing the toothed gear 833 to rotate. At the same time, the spring piece 836 is deformed, and the gear teeth on the gear 833 are engaged with the gear teeth on the toothed ring 832. The toothed ring 832 drives the toothed gear 833 to rotate, and the toothed gear 833 drives the gear ring 2 834 to rotate, and the gear ring 2 834 drives the rotating plate 82 to rotate. The air hole 1 is connected to the air hole 2, and the exhaust gas flows upward through the air hole 1 and the air hole 2; the spring piece 836 deforms and squeezes the sliding rod 8712, and the sliding rod 8712 drives the piston 1 8713 to move downward, squeezing the gas in the fixed cylinder 8711 and the air pipe 8714. Under the action of air pressure, the piston 2 8715 moves downward, driving the connecting ring rod 872 to move downward, and the connecting ring rod 872 drives the gear plate 876 to move downward, and the gear plate 876 drives the gear 2 875 to rotate, thereby driving the swirl plate 86 to rotate, so that the gap between the two adjacent groups of swirl plates 86 becomes smaller, the exhaust gas flow through the filler plate 9 is reduced, the swirl intensity is increased, and the spraying effect is improved;

[0109] When the missing gear 833 rotates to the point where it is no longer engaged with the missing tooth ring 832, the air hole 1 and the air hole 2 return to the misaligned state, the spring 836 rebounds to restore the original state, and the connecting ring rod 872 moves upward under the reaction force of the spring 874, thereby driving the tooth plate 876 to move upward, and the swirl plate 86 rotates in the opposite direction, so that the gap between the two adjacent groups of swirl plates 86 becomes larger, the exhaust flow through the filler plate 9 becomes larger, and the flow rate is reduced, thereby ensuring the spraying effect.

[0110] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0111] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A tail gas treatment device for the production of dichlorobenzonitrile in the chemical industry, comprising: A spray tower, wherein the bottom of the spray tower is connected to the support base, an air inlet is provided on the side wall of the bottom of the spray tower, an air outlet is provided on the top of the spray tower, and a liquid outlet is provided at the bottom, characterized in that it also includes: The motor is connected to the outer wall of the spray tower; A filler plate is located inside the spray tower and connected to its inner wall; A spray mechanism, one end of which is connected to the spray tower and the other end is connected to the output end of the motor, for spraying the alkaline liquid; The air flow deceleration mechanism is used to slow down the flow speed of exhaust gas, and the air flow deceleration mechanism includes: a fixed plate plate, which is located inside the spray tower and connected thereto, and a plurality of groups of air holes 1 are opened on the fixed plate plate; a rotating plate plate is located at the bottom of the fixed plate plate and abuts against it, the rotating plate plate is rotatably connected to the spray tower, and a plurality of groups of air holes 2 are opened on the rotating plate plate; an intermittent transmission component, one end of which is connected to the spray mechanism and the other end is connected to the rotating plate plate, for driving the rotating plate plate to rotate intermittently; a fixed pipe, the top end of which is connected to the spray mechanism, the fixed pipe passes through the filler plate and is rotatably connected to it; a fixed frame, which is connected to the bottom end of the fixed pipe and is connected to the inside of it; a swirl plate, which is rotatably connected to the fixed frame, and the swirl plates are provided with a plurality of groups and are arranged in a circle with equal intervals; an angle adjustment component, one end of which is connected to the intermittent transmission component and the other end is connected to the swirl plate, for adjusting the inclination angle of the swirl plate.

2. A tail gas treatment device for the production of dichlorobenzonitrile according to claim 1, characterized in that: The spray mechanism comprises: a liquid storage tank containing an alkaline solution; A liquid pumping machine, wherein the input end is connected with the interior of the liquid storage tank; A connecting pipe connected to the output end of the liquid pump; A fixing ring is connected to the outer wall of the spray tower, and the connecting pipe passes through the fixing ring and is connected thereto; A rotating frame is rotatably connected to the fixed ring and communicated with the interior of the connecting pipe, and the rotating frame is rotatably connected to the spray tower; A spray pipe is connected to the interior of the rotating frame. The spray pipe is located inside the spray tower and on the top of the filler plate. An atomizing nozzle is provided at the bottom of the spray pipe. The rotating assembly has one end connected to the output end of the motor and the other end connected to the rotating frame, and is used to drive the rotating frame to rotate.

3. A tail gas treatment device for the production of dichlorobenzonitrile according to claim 2, characterized in that: The rotating assembly comprises: Gear 1, connected to the output end of the motor; The first gear ring is connected to the rotating frame and meshes with the first gear.

4. A tail gas treatment device for the production of dichlorobenzonitrile according to claim 2, characterized in that: The intermittent transmission assembly comprises: Rotating ring connected to the spray pipe; a toothed ring connected to the rotating ring; A missing gear is rotatably connected to the spray tower, and the gear teeth on the missing gear are meshed with the gear teeth on the missing gear ring; Gear ring 2 is connected to the rotating plate and meshes with the gear teeth on the missing gear; an abutment rod connected to the eccentric portion of the missing gear; The spring piece is connected to the rotating ring and abuts against the abutting rod.

5. A tail gas treatment device for the production of dichlorobenzonitrile according to claim 4, characterized in that: The angle adjustment component includes: A pneumatic assembly, one end of which is connected to the rotating ring and the other end is connected to the fixed pipe; A connecting ring rod is connected to the pneumatic assembly, and the connecting ring rod is located inside the fixed frame; The telescopic rod has a bottom end connected to the fixed frame and a top end connected to the connecting ring rod; The spring has a bottom end connected to the fixed frame and a top end connected to the connecting ring rod; Gear 2, connected to the swirl plate; The tooth plate is connected to the connecting ring rod and meshes with the second gear.

6. A tail gas treatment device for the production of dichlorobenzonitrile according to claim 5, characterized in that: The pneumatic assembly includes: a fixed cylinder connected to the rotating ring; The sliding rod passes through the top of the fixed cylinder and is slidably connected thereto; The first piston is located inside the fixed cylinder and is in sliding contact with the inner wall thereof, and the first piston is connected to the bottom end of the sliding rod; an air pipe, one end of which is in communication with the interior of the bottom end of the fixed cylinder and the other end of which is in communication with the interior of the fixed pipe; The second piston is located inside the fixed tube and is in sliding contact with the inner wall of the fixed tube. The second piston is connected to the connecting ring rod.

7. The tail gas treatment device for the production of dichlorobenzonitrile according to claim 1, characterized in that: Also includes: The inspection and observation port is opened on the side wall of the spray tower and is located on the top of the packing plate.

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