A nitration tail gas absorption and treatment system applied to the production of mixed dinitrobenzene

Abstract

The present invention discloses a nitration tail gas absorption and treatment system applied to the production of mixed dinitrobenzene, which relates to the technical field of mixed dinitrobenzene production. The system includes an absorption tank. A gas outlet and an absorption liquid discharge port are respectively provided at the top and bottom of the absorption tank. An absorption liquid addition port and an exhaust gas introduction pipe are respectively provided at positions near the top and bottom on one side of the absorption tank. One end of the exhaust gas introduction pipe extends into the interior of the absorption tank and is connected with a gas distribution mechanism, and an absorption liquid lifting and spraying mechanism is arranged inside the absorption tank. The absorption liquid lifting and spraying mechanism includes a lifting pipe, and a plurality of absorption liquid sprayers are communicated around the lifting pipe near the top position. The present invention overcomes the deficiencies of the prior art. The cooperation between various components is close. It not only improves the absorption and treatment efficiency of nitration tail gas, but also has good stability and reliability, can operate stably for a long time, reduces the need for manual intervention, and lowers the operation cost.

Description

Technical Field

[0001] The present invention relates to the technical field of mixed dinitrobenzene production, and particularly to a nitration tail gas absorption and treatment system applied to the production of mixed dinitrobenzene. Background Art

[0002] Mixed dinitrobenzene is an important chemical intermediate, which is used in the production of dyes, paints, and coatings, and is also used in the production of phenylenediamine. During the production process of mixed dinitrobenzene, nitration tail gas is inevitably generated, and these tail gases often contain various harmful substances such as nitrogen oxides. If these nitration tail gases are directly discharged into the atmospheric environment without proper treatment, a series of serious environmental problems will be caused.

[0003] When traditional tail gas treatment technologies are applied to the treatment of nitration tail gas in the production of mixed dinitrobenzene, there are many limitations. For example, in the contact link between the tail gas and the absorption liquid, in some traditional treatment systems, due to uneven gas distribution, the tail gas cannot fully contact with the absorption liquid, resulting in a significant reduction in the absorption effect of the absorption liquid on harmful substances in the tail gas. Therefore, a more efficient, reasonable and stable operating nitration tail gas absorption and treatment system is needed to solve these problems. Summary of the Invention

[0004] In order to solve the problems mentioned in the above background art, the present invention provides a nitration tail gas absorption and treatment system applied to the production of mixed dinitrobenzene.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A nitration tail gas absorption and treatment system applied to the production of mixed dinitrobenzene includes an absorption tank. A gas outlet and an absorption liquid discharge port are respectively provided at the top and bottom of the absorption tank. An absorption liquid addition port and an exhaust gas introduction pipe are respectively provided at positions near the top and bottom on one side of the absorption tank. One end of the exhaust gas introduction pipe extends into the interior of the absorption tank and is connected with a gas distribution mechanism, and an absorption liquid lifting and spraying mechanism is provided inside the absorption tank;

[0007] The absorption liquid lifting and spraying mechanism includes a lifting pipe, and a plurality of absorption liquid sprayers are communicated around the lifting pipe near the top position.

[0008] Preferably, the gas distribution mechanism includes an annular distributor. A plurality of vertical gas distribution pipes are annularly distributed at the top of the annular distributor. A plurality of horizontal gas distribution pipes are communicated on the outer side of the vertical gas distribution pipes, and exhaust holes are opened on the horizontal gas distribution pipes.

[0009] Preferably, a turbine blade is rotatably installed in the exhaust gas inlet pipe through a support shaft, one end of the support shaft extends to the outside of the exhaust gas inlet pipe and is fixed with a first bevel gear, a first straight gear is fixed to the outside of each of the plurality of vertical gas distribution pipes, a synchronous gear ring is rotatably installed at the top end of the annular distributor, and all the first straight gears are engaged with the synchronous gear ring, and a second bevel gear is fixed to the outside of one of the vertical gas distribution pipes, and the first bevel gear is engaged with the second bevel gear.

[0010] Preferably, the absorption liquid sprayers are evenly distributed annularly around the riser, the spray nozzles of the absorption liquid sprayers face vertically downward, and the height of the absorption liquid sprayers is greater than the liquid level height of the absorption liquid inside the absorption tank.

[0011] Preferably, a vertically arranged reciprocating lead screw is rotatably installed inside the riser, a lifting piston is further installed inside the riser, and the reciprocating lead screw passes through the lifting piston through a threaded hole.

[0012] Preferably, a guide rod is fixed inside the riser, and the guide rod passes through the lifting piston through a guide hole.

[0013] Preferably, a plurality of liquid inlet ports are formed in the riser, a hydraulic balance hole is further formed at the bottom end of the riser, and a sealing plate group is rotatably installed outside the riser.

[0014] Preferably, the sealing plate group is composed of a plurality of arc-shaped sealing plates, and each arc-shaped sealing plate corresponds to and matches each liquid inlet port. A rotary motor is fixed to the top end of the absorption tank, a second straight gear is fixed to the output shaft of the rotary motor, the top end of the reciprocating lead screw extends to the outside of the riser and is fixed with a third straight gear, and the second straight gear is engaged with the third straight gear.

[0015] Preferably, a first transmission member and a second transmission member are respectively rotatably installed at positions near the bottom end and the top end inside the riser. Both the first transmission member and the second transmission member are annular columnar structures, and guide inclined surfaces are formed on both the first transmission member and the second transmission member. The guide inclined surfaces on the first transmission member and the second transmission member are symmetrically arranged up and down. A first trigger rod and a second trigger rod are respectively fixed to the bottom end and the top end of the lifting piston, and the first trigger rod and the second trigger rod are arranged staggeredly. Both the first transmission member and the second transmission member are fixedly connected to the sealing plate group.

[0016] Preferably, the first transmission member is fixedly connected to the sealing plate group through a first connecting frame. A horizontal connecting rod is fixed to the second transmission member. One end of the horizontal connecting rod away from the second transmission member extends to the outside of the riser through an arc-shaped opening and is fixedly connected to the sealing plate group through a second connecting frame. An arc-shaped sealing strip is fixed to the horizontal connecting rod, and the arc-shaped sealing strip is in sliding contact with the outer wall of the riser.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. Through the cooperation of the annular distributor, the vertical gas distribution pipe and the horizontal gas distribution pipe, the exhaust gas introduced into the absorption tank can be evenly dispersed, so that the exhaust gas and the absorption liquid are fully in contact, and the absorption effect is improved. The turbine blades set in the exhaust gas introduction pipe can drive a series of gear transmissions under the blowing of the exhaust gas, so that the vertical gas distribution pipe rotates, further enhancing the uniformity of gas distribution. At the same time, the horizontal gas distribution pipe can also stir the absorption liquid with the rotation, without the need for external power input, which is energy-saving and environmentally friendly and more conducive to exhaust gas absorption.

[0019] 2. The absorption liquid lifting and spraying mechanism can draw up the absorption liquid at the bottom of the absorption tank and spray it down in atomized form, so as to conduct secondary contact absorption with the gas emerging from the absorption liquid. It works in coordination with the lifting pipe, absorption liquid sprayer and other components. The absorption liquid sprayer is evenly distributed around the lifting pipe in a circular shape and the spraying port is vertically downward, with a height greater than the absorption liquid level in the absorption tank, which ensures the spraying range and effect and further improves the overall absorption efficiency.

[0020] 3. The reciprocating screw arranged in the lifting tube cooperates with the lifting piston, and the reciprocating screw is driven to rotate by the rotating motor, thereby driving the lifting piston to move up and down, thereby realizing effective control over the extraction and spraying of the absorption liquid. At the same time, the liquid inlet opened on the lifting tube and the sealing plate group installed externally for rotation can be switched between two states: the sealing plate group blocks the liquid inlet and the liquid inlet is staggered. When the lifting piston moves upward, the sealing plate group blocks the liquid inlet, and the liquid can only be sprayed out from the absorption liquid sprayer, achieving the purpose of lifting the absorption liquid upward and spraying it out; when the lifting piston moves downward, it switches to a state where the sealing plate group is staggered from the liquid inlet, ensuring that the absorption liquid can enter the lifting tube. Through the continuous lifting and reciprocating movement of the piston and the switching of the two states, the liquid can be continuously sprayed out from the absorption liquid sprayer, effectively ensuring the recycling and stable spraying of the absorption liquid.

[0021] 4. The first transmission member, the second transmission member and the related trigger rod, guide slope and other components arranged in the lifting pipe can automatically switch between the two states of the blocking plate group as the lifting piston rises and falls, without the need for additional driving and control devices. The structure is ingenious and the operation is stable, further ensuring the automation and reliability of the absorption liquid circulation and spraying process.

[0022] The present invention overcomes the shortcomings of the prior art, and the various components work closely together, which not only improves the absorption and treatment efficiency of nitrification tail gas, but also has good stability and reliability, can operate stably for a long time, reduces the need for manual intervention, and reduces operating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0024] Figure 1 Isometric view of the absorption tank of the present invention;

[0025] Figure 2 First perspective cross-sectional view of the absorption tank of the present invention;

[0026] Figure 3 Second perspective cross-sectional view of the absorption tank of the present invention;

[0027] Figure 4 Enlarged detailed view of the gas distribution mechanism of the present invention;

[0028] Figure 5 For Figure 4 Enlarged cross-sectional view at position A in

[0029] Figure 6 Schematic diagram of the alignment state of the plugging plate group and the liquid inlet in the absorption liquid lifting and spraying mechanism of the present invention;

[0030] Figure 7 Schematic diagram of the misaligned state of the plugging plate group and the liquid inlet in the absorption liquid lifting and spraying mechanism of the present invention;

[0031] Figure 8 Schematic diagram of the absorption liquid lifting and spraying mechanism of the present invention omitting the structure of the plugging plate group;

[0032] Figure 9 First perspective cross-sectional view of the lifting pipe of the present invention;

[0033] Figure 10 Second perspective cross-sectional view of the lifting pipe of the present invention;

[0034] Figure 11 For the present invention Figure 10 Enlarged detailed view at position B in

[0035] Figure 12 For the present invention Figure 10 Enlarged detailed view at position C in

[0036] In the figure: 1. Absorption tank; 101. Absorbent liquid addition port; 102. Gas outlet; 103. Exhaust gas inlet pipe; 1031. Support shaft; 1032. Turbine blade; 1033. First bevel gear; 104. Absorbent liquid discharge port; 2. Annular distributor; 201. Vertical gas distribution pipe; 2011. Horizontal gas distribution pipe; 202. Second bevel gear; 203. First spur gear; 204. Synchronous gear ring; 3. Absorbent liquid lifting and spraying mechanism; 301. Lifting pipe; 302. Liquid inlet; 303. Reciprocating lead screw; 3031. Third spur gear; 304. Lifting piston; 3041. First trigger rod; 3042. Second trigger rod; 305. Guide rod; 306. Absorbent liquid sprayer; 307. Plugging plate group; 4. First transmission member; 401. Second transmission member; 402. Guide inclined plane; 403. First connecting frame; 404. Horizontal connecting rod; 405. Second connecting frame; 406. Arc-shaped plugging strip; 5. Rotating motor; 501. Second spur gear. Detailed implementation mode

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0038] Embodiment 1

[0039] Refer to Figures 1-12 , a nitration tail gas absorption and treatment system applied to the production of mixed dinitrobenzene, including an absorption tank 1. A gas outlet 102 and an absorbent liquid discharge port 104 are respectively arranged at the top and bottom of the absorption tank 1. An absorbent liquid addition port 101 and an exhaust gas inlet pipe 103 are respectively arranged at positions near the top and bottom on one side of the absorption tank 1. One end of the exhaust gas inlet pipe 103 extends into the interior of the absorption tank 1 and is connected with a gas distribution mechanism, and an absorbent liquid lifting and spraying mechanism 3 is arranged inside the absorption tank 1;

[0040] The absorbent liquid is introduced into the absorption tank 1 through the absorbent liquid addition port 101, and the tail gas is introduced into the absorbent liquid inside the absorption tank 1 through the exhaust gas inlet pipe 103. The tail gas is dispersed by the gas distribution mechanism to improve the contact rate between the tail gas and the absorbent liquid and improve the absorption effect. The saturated absorbent liquid after use is discharged through the absorbent liquid discharge port 104;

[0041] The absorbent liquid lifting and spraying mechanism 3 is used to pump up the absorbent liquid at the bottom of the absorption tank 1. The absorbent liquid lifting and spraying mechanism 3 includes a lifting pipe 301. A plurality of absorbent liquid sprayers 306 are connected around the lifting pipe 301 near the top position. The absorbent liquid sprayers 306 are evenly distributed annularly around the lifting pipe 301. The spray nozzles of the absorbent liquid sprayers 306 are vertically downward, and the height of the absorbent liquid sprayers 306 is greater than the liquid level height of the absorbent liquid inside the absorption tank 1. The pumped-up absorbent liquid is atomized and sprayed downward through the absorbent liquid sprayers 306, and makes secondary contact absorption with the gas emerging from the absorbent liquid, further improving the absorption efficiency.

[0042] Embodiment 2

[0043] Referring to Figures 1-12 , the difference between this embodiment and Embodiment 1 is that the gas distribution mechanism includes an annular distributor 2. A plurality of vertical gas distribution pipes 201 are annularly distributed at the top of the annular distributor 2. A plurality of horizontal gas distribution pipes 2011 are connected to the outside of the vertical gas distribution pipes 201. Exhaust holes are provided on the horizontal gas distribution pipes 2011;

[0044] The tail gas first enters the annular distributor 2, and then is distributed to each vertical gas distribution pipe 201, and then further distributed to the horizontal gas distribution pipes 2011, and finally discharged through the exhaust holes, which can effectively improve the uniformity of gas distribution and improve the absorption efficiency.

[0045] Embodiment 3

[0046] Referring to Figures 1-12 , the difference between this embodiment and Embodiment 2 is that a turbine blade 1032 is rotatably installed in the exhaust gas inlet pipe 103 through a support shaft 1031, and one end of the support shaft 1031 extends to the outside of the exhaust gas inlet pipe 103 and is fixed with a first bevel gear 1033. A first spur gear 203 is fixed to the outside of each vertical gas distribution pipe 201. A synchronous gear ring 204 is rotatably installed at the top of the annular distributor 2. A plurality of first spur gears 203 are all meshed with the synchronous gear ring 204, and a second bevel gear 202 is fixed to the outside of one of the vertical gas distribution pipes 201. The first bevel gear 1033 is meshed with the second bevel gear 202;

[0047] After introducing the exhaust gas, the exhaust gas will blow the turbine blade 1032, thereby driving the support shaft 1031 to rotate, and then driving the first bevel gear 1033 to rotate. Through the meshing of the first bevel gear 1033 and the second bevel gear 202, one of the vertical gas distribution pipes 201 can be driven to rotate, and then through the meshing of the first spur gear 203 and the synchronous gear ring 204, multiple vertical gas distribution pipes 201 can be driven to rotate. On the one hand, it can further improve the gas distribution effect, and the horizontal gas distribution pipes 2011 can also stir the absorbent liquid when rotating, without external power input, which is more energy-saving and environmentally friendly.

[0048] Example 4

[0049] Reference Figures 1-12 The difference between this embodiment and embodiment 3 is that a vertically arranged reciprocating screw 303 is rotatably installed inside the lifting tube 301, a lifting piston 304 is also installed inside the lifting tube 301, the reciprocating screw 303 penetrates the lifting piston 304 through a threaded hole, a guide rod 305 is fixed inside the lifting tube 301, and the guide rod 305 penetrates the lifting piston 304 through a guide hole;

[0050] By driving the reciprocating screw 303 to rotate, the lifting piston 304 can be driven to move up and down. A rotating motor 5 is fixed to the top of the absorption tank 1. The output shaft of the rotating motor 5 is fixed with a second spur gear 501. The top of the reciprocating screw 303 extends to the outside of the lifting tube 301 and is fixed with a third spur gear 3031. The second spur gear 501 is meshed with the third spur gear 3031. When the rotating motor 5 is turned on, the second spur gear 501 can be driven to rotate, and the reciprocating screw 303 can be driven to rotate by the meshing of the second spur gear 501 and the third spur gear 3031.

[0051] The lifting tube 301 is provided with a plurality of liquid inlets 302, and a hydraulic balance hole is also provided at the bottom end of the lifting tube 301. A plugging plate group 307 is rotatably installed on the outside of the lifting tube 301. The plugging plate group 307 is composed of a plurality of arc-shaped plugging plates, and each arc-shaped plugging plate corresponds to each liquid inlet 302. When the plugging plate group 307 can rotate around the lifting tube 301, it can switch between a state where the plugging plate group 307 blocks the liquid inlet 302 and a state where the plugging plate group 307 is staggered with the liquid inlet 302 (such as Figure 6 and Figure 7 ), when the lifting piston 304 moves upward, the blocking plate group 307 blocks the liquid inlet 302, and the liquid can only be sprayed out from one outlet of the absorption liquid sprayer 306, thereby achieving the purpose of lifting the absorption liquid upward and spraying it out;

[0052] When the lifting piston 304 moves downward, it switches to a state where the sealing plate group 307 is staggered from the liquid inlet 302. At this time, when the lifting piston 304 moves to the lowest position, the absorption liquid can enter the lifting pipe 301 from the liquid inlet 302. The lifting piston 304 only needs to continuously move up and down and reciprocate, and switch between these two states, so that the liquid can be continuously sprayed out from the absorption liquid sprayer 306.

[0053] Example 5

[0054] Reference Figures 1-12, in order to achieve the purpose of automatically switching between two states as the lifting piston 304 moves up and down, a first transmission member 4 and a second transmission member 401 are respectively rotatably installed near the bottom and top positions inside the riser 301. Both the first transmission member 4 and the second transmission member 401 are annular columnar structures, and guiding inclined surfaces 402 are provided on both the first transmission member 4 and the second transmission member 401. The guiding inclined surfaces 402 on the first transmission member 4 and the second transmission member 401 are symmetrically arranged up and down. A first trigger rod 3041 and a second trigger rod 3042 are respectively fixed to the bottom end and the top end of the lifting piston 304. The first trigger rod 3041 and the second trigger rod 3042 are arranged staggeredly. Both the first transmission member 4 and the second transmission member 401 are fixedly connected to the plugging plate group 307;

[0055] When the lifting piston 304 moves downward and reaches the lowest position, the first trigger rod 3041 contacts the guiding inclined surface 402 at the top end of the first transmission member 4 and pushes the first transmission member 4 to rotate, driving the plugging plate group 307 to rotate by an angle, converting the plugging plate group 307 from the staggered state to the plugging state. When the lifting piston 304 moves upward, the second trigger rod 3042 will move upward and contact the guiding inclined surface 402 at the bottom end of the second transmission member 401, and push the first transmission member 4 to rotate reversely and reset, thereby driving the plugging plate group 307 to rotate reversely by the same angle, converting the plugging plate group 307 from the plugging state to the staggered state. It can run automatically without additional driving and control devices, with a clever structure and stable operation.

[0056] Among them, the first transmission member 4 and the plugging plate group 307 are fixed through a first connecting frame 403. A horizontal connecting rod 404 is fixed on the second transmission member 401. One end of the horizontal connecting rod 404 away from the second transmission member 401 extends to the outside of the riser 301 through an arc-shaped opening and is fixed to the plugging plate group 307 through a second connecting frame 405. An arc-shaped plugging strip 406 is fixed on the horizontal connecting rod 404, and the arc-shaped plugging strip 406 is in sliding contact with the outer wall of the riser 301.

[0057] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0058] In the present invention, unless otherwise clearly defined or limited, terms such as "arranged", "installed", "connected", "linked", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0059] The control mode of the present invention is automatically controlled by a controller. The control circuit of the controller can be realized by simple programming by those skilled in the art. The provision of power also belongs to the common knowledge in the art. And the present invention is mainly used to protect mechanical devices, so the control mode and circuit connection of the present invention will not be explained in detail herein.

[0060] As described above, only the preferred specific embodiments of the present invention are given, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes, shall be covered by the protection scope of the present invention.

Claims

1. A nitration tail gas absorption and treatment system applied to the production of mixed dinitrobenzene, including an absorption tank (1), characterized in that: The top and bottom of the absorption tank (1) are respectively provided with a gas outlet (102) and an absorption liquid discharge port (104); one side of the absorption tank (1) is respectively provided with an absorption liquid addition port (101) and a waste gas introduction pipe (103) near the top and bottom; one end of the waste gas introduction pipe (103) extends to the inside of the absorption tank (1) and is connected to a gas distribution mechanism; and an absorption liquid lifting and spraying mechanism (3) is provided inside the absorption tank (1); The absorption liquid lifting and spraying mechanism (3) comprises a lifting pipe (301), and a plurality of absorption liquid sprayers (306) are connected to the lifting pipe (301) near the top thereof. The gas distribution mechanism comprises an annular distributor (2), and a plurality of vertical gas distribution pipes (201) are distributed in an annular manner at the top of the annular distributor (2); A reciprocating screw rod (303) arranged vertically is rotatably mounted inside the lifting tube (301), and a lifting piston (304) is also mounted inside the lifting tube (301), and the reciprocating screw rod (303) penetrates the lifting piston (304) through a threaded hole; The lifting pipe (301) is provided with a plurality of liquid inlets (302), and a hydraulic balance hole is also provided at the bottom end of the lifting pipe (301). A sealing plate group (307) is rotatably mounted on the outside of the lifting pipe (301); The blocking plate group (307) is composed of a plurality of arc-shaped blocking plates, and each arc-shaped blocking plate is matched with each liquid inlet (302); a rotating motor (5) is fixed to the top of the absorption tank (1); a second spur gear (501) is fixed to the output shaft of the rotating motor (5); a top of the reciprocating screw rod (303) extends to the outside of the lifting tube (301) and is fixed to a third spur gear (3031); the second spur gear (501) is meshed with the third spur gear (3031); A first transmission member (4) and a second transmission member (401) are rotatably mounted near the bottom and top ends of the lifting tube (301). Both the first transmission member (4) and the second transmission member (401) are annular columnar structures, and both the first transmission member (4) and the second transmission member (401) are provided with guide inclined surfaces (402). The guide inclined surfaces (402) on the first transmission member (4) and the second transmission member (401) are symmetrically arranged up and down. A first trigger rod (3041) and a second trigger rod (3042) are fixed to the bottom and top ends of the lifting piston (304) respectively. The first trigger rod (3041) and the second trigger rod (3042) are staggered with each other. Both the first transmission member (4) and the second transmission member (401) are fixed to the blocking plate group (307). When the lifting piston (304) moves downward and reaches the lowest position, the first trigger rod (3041) contacts the guiding inclined surface (402) at the top of the first transmission member (4), and pushes the first transmission member (4) to rotate, driving the plugging plate group (307) to rotate by an angle, converting the plugging plate group (307) from the staggered state to the plugging state. When the lifting piston (304) moves upward, the second trigger rod (3042) will move upward and contact the guiding inclined surface (402) at the bottom of the second transmission member (401), and push the first transmission member (4) to rotate reversely and reset, thereby driving the plugging plate group (307) to rotate reversely by the same angle, converting the plugging plate group (307) from the plugging state to the staggered state.

2. The nitration tail gas absorption and treatment system applied to the production of mixed dinitrobenzene according to claim 1, wherein: A plurality of horizontal gas distribution pipes (2011) are communicated with the outside of the vertical gas distribution pipe (201), and exhaust holes are provided on the horizontal gas distribution pipes (2011).

3. The nitration tail gas absorption and treatment system applied to the production of mixed dinitrobenzene according to claim 2, characterized in that: A turbine blade (1032) is rotatably installed in the waste gas introduction pipe (103) through a support shaft (1031), and one end of the support shaft (1031) extends to the outside of the waste gas introduction pipe (103) and is fixed with a first bevel gear (1033). First spur gears (203) are fixed to the outside of a plurality of vertical gas distribution pipes (201). A synchronous toothed ring (204) is rotatably installed at the top of the annular distributor (2). A plurality of first spur gears (203) are all meshed with the synchronous toothed ring (204), and a second bevel gear (202) is fixed to the outside of one of the vertical gas distribution pipes (201). The first bevel gear (1033) is meshed with the second bevel gear (202).

4. A nitration tail gas absorption and treatment system applied to the production of mixed dinitrobenzene according to claim 1, characterized in that: The absorbent sprayer (306) is evenly distributed annularly around the riser (301). The spray orifice of the absorbent sprayer (306) is vertically downward, and the height of the absorbent sprayer (306) is greater than the liquid level height of the absorbent liquid inside the absorption tank (1).

5. A nitration tail gas absorption and treatment system applied to the production of mixed dinitrobenzene according to claim 1, characterized in that: A guiding rod (305) is fixed inside the riser (301), and the guiding rod (305) passes through the lifting piston (304) through a guiding hole.

6. The nitration tail gas absorption and treatment system applied to the production of mixed dinitrobenzene according to claim 1, characterized in that: The first transmission member (4) and the plugging plate group (307) are fixed through a first connecting frame (403). A horizontal connecting rod (404) is fixed to the second transmission member (401). One end of the horizontal connecting rod (404) far from the second transmission member (401) extends to the outside of the riser (301) through an arc-shaped opening and is fixed to the plugging plate group (307) through a second connecting frame (405). An arc-shaped plugging strip (406) is fixed to the horizontal connecting rod (404), and the arc-shaped plugging strip (406) is in sliding contact with the outer wall of the riser (301).

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