Nitrification tail gas absorption treatment system applied to mixed dinitrobenzene production

Abstract

The present invention discloses a nitration tail gas absorption treatment system applied to mixed dinitrobenzene production, and relates to the technical field of mixed dinitrobenzene production, the nitration tail gas absorption treatment system comprises an absorption tank, the top end and the bottom end of the absorption tank are respectively provided with a gas outlet and an absorption liquid discharge port, an absorption liquid adding opening and a waste gas introduction pipe are arranged at the positions, close to the top end and the bottom end, of one side of the absorption tank correspondingly, one end of the waste gas introduction pipe extends into the absorption tank and is connected with a gas distribution mechanism, and an absorption liquid lifting and spraying mechanism is arranged in the absorption tank; the absorption liquid lifting and spraying mechanism comprises a lifting pipe, and a plurality of absorption liquid sprayers are communicated with the position, close to the top end, of the periphery of the lifting pipe. According to the invention, the defects in the prior art are overcome, all the components cooperate closely, the absorption treatment efficiency of the nitration tail gas is improved, the stability and reliability are good, long-term stable operation can be realized, the manual intervention demand is reduced, and the operation cost is reduced.

Description

Technical Field

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

[0002] Mixed dinitrobenzene is an important chemical intermediate used in the production of dyes, paints, coatings, and also in the production of phenylenediamine. The production process of mixed dinitrobenzene will inevitably produce nitration tail gas, which often contains a variety of harmful substances, such as nitrogen oxides. If these nitration tail gases are directly discharged into the atmosphere without proper treatment, it will cause a series of serious environmental problems.

[0003] Traditional tail gas treatment technology has many limitations when applied to the treatment of nitration tail gas in mixed dinitrobenzene production. For example, in the contact link between tail gas and absorption liquid, some traditional treatment systems cannot fully contact tail gas with absorption liquid due to uneven gas distribution, which greatly reduces the absorption effect of absorption liquid on harmful substances in tail gas. Therefore, a more efficient, reasonable and stable nitration tail gas absorption treatment system is needed to solve these problems. Summary of the invention

[0004] In order to solve the problems mentioned in the above background technology, 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: A nitration tail gas absorption and treatment system for mixed dinitrobenzene production, comprising an absorption tank, wherein the top and bottom of the absorption tank are respectively provided with a gas outlet and an absorption liquid discharge port, an absorption liquid addition port and a waste gas introduction pipe are respectively provided on one side of the absorption tank near the top and bottom, one end of the waste gas introduction pipe extends to the inside of the absorption tank and is connected to a gas distribution mechanism, and an absorption liquid lifting and spraying mechanism is provided inside the absorption tank; The absorption liquid lifting and spraying mechanism comprises a lifting pipe, and a plurality of absorption liquid sprayers are connected to the lifting pipe near the top.

[0006] Preferably, the gas distribution mechanism comprises an annular distributor, a plurality of vertical gas distribution pipes are distributed in an annular manner at the top of the annular distributor, the outer sides of the vertical gas distribution pipes are connected to a plurality of horizontal gas distribution pipes, and exhaust holes are opened on the horizontal gas distribution pipes.

[0007] Preferably, the exhaust gas inlet pipe is rotatably installed with the turbine blades through a support shaft, and one end of the support shaft extends to the outside of the exhaust gas inlet pipe and is fixed with a first bevel gear, the outside of multiple vertical gas distribution pipes are fixed with a first spur gear, and the top of the annular distributor is rotatably installed with a synchronous gear ring, and multiple first spur gears are meshed 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 meshed with the second bevel gear.

[0008] Preferably, the absorption liquid sprayers are evenly distributed in a ring around the lifting pipe, the spraying ports of the absorption liquid sprayers are vertically downward, and the height of the absorption liquid sprayers is greater than the liquid level of the absorption liquid inside the absorption tank.

[0009] Preferably, a vertically arranged reciprocating screw is rotatably installed inside the lifting tube, and a lifting piston is also installed inside the lifting tube, and the reciprocating screw penetrates the lifting piston through a threaded hole.

[0010] Preferably, a guide rod is fixed inside the lifting tube, and the guide rod passes through the lifting piston through a guide hole.

[0011] Preferably, the lifting pipe is provided with a plurality of liquid inlets, a hydraulic balance hole is also provided at the bottom end of the lifting pipe, and a sealing plate group is rotatably mounted on the outside of the lifting pipe.

[0012] Preferably, the sealing plate group is composed of a plurality of arc-shaped sealing plates, and each arc-shaped sealing plate corresponds to each liquid inlet. A rotating motor is fixed to the top of the absorption tank, and a second spur gear is fixed to the output shaft of the rotating motor. The top of the reciprocating screw extends to the outside of the lifting tube and is fixed with a third spur gear, and the second spur gear is meshed with the third spur gear.

[0013] Preferably, the first transmission member and the second transmission member are rotatably installed inside the lifting tube near the bottom end and the top end respectively, the first transmission member and the second transmission member are both annular columnar structures, and the first transmission member and the second transmission member are both provided with guide slopes, the guide slopes on the first transmission member and the second transmission member are symmetrically arranged up and down, the bottom end and the top end of the lifting piston are respectively fixed with the first trigger rod and the second trigger rod, the first trigger rod and the second trigger rod are staggered with each other, and the first transmission member and the second transmission member are both fixed to each other between the blocking plate group.

[0014] Preferably, the first transmission member is fixed to the sealing plate group by a first connecting frame, a horizontal connecting rod is fixed on the second transmission member, one end of the horizontal connecting rod away from the second transmission member extends to the outside of the lifting tube through an arc-shaped opening and is fixed to the sealing plate group by the second connecting frame, an arc-shaped sealing strip is fixed on the horizontal connecting rod, and the arc-shaped sealing strip is in sliding contact with the outer wall of the lifting tube.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 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.

[0016] 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.

[0017] 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.

[0018] 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.

[0019] 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

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a three-dimensional diagram of the absorption tank of the present invention; Figure 2 It is a cross-sectional view of the absorption tank of the present invention from a first viewing angle; Figure 3 A cross-sectional view of the absorption tank of the present invention from a second viewing angle; Figure 4 It is an enlarged detail view of the gas distribution mechanism of the present invention; Figure 5 for Figure 4 Enlarged cross-sectional view of position A in the middle; Figure 6 It is a schematic diagram of the alignment state between the blocking plate group and the liquid inlet in the absorption liquid lifting and spraying mechanism of the present invention; Figure 7 It is a schematic diagram of the staggered state of the blocking plate group and the liquid inlet in the absorption liquid lifting and spraying mechanism of the present invention; Figure 8 This is a schematic diagram of the structure of the absorption liquid lifting and spraying mechanism of the present invention without the blocking plate group; Fig. 9 A cross-sectional view of the riser of the present invention from a first viewing angle; Fig.10 A cross-sectional view of the riser of the present invention from a second viewing angle; Fig.11 For the present invention Fig.10 Enlarged detail of position B in the middle; Fig.12 For the present invention Fig.10 Enlarged detail image of the middle C position; In the figure: 1. Absorption tank; 101. Absorption liquid addition port; 102. Gas outlet; 103. Waste gas introduction pipe; 1031. Support shaft; 1032. Turbine blades; 1033. First bevel gear; 104. Absorption liquid discharge port; 2. Ring distributor; 201. Vertical gas distribution pipe; 2011. Horizontal gas distribution pipe; 202. Second bevel gear; 203. First straight gear; 204. Synchronous gear ring; 3. Absorption liquid lifting and spraying mechanism; 301. Lifting pipe; 302. Liquid inlet; 303, reciprocating screw; 3031, third spur gear; 304, lifting piston; 3041, first trigger rod; 3042, second trigger rod; 305, guide rod; 306, absorption liquid sprayer; 307, blocking plate group; 4, first transmission member; 401, second transmission member; 402, guide slope; 403, first connecting frame; 404, horizontal connecting rod; 405, second connecting frame; 406, arc-shaped blocking strip; 5, rotating motor; 501, second spur gear. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] Example 1

[0024] Reference Figure 1-12 A nitration tail gas absorption treatment system for mixed dinitrobenzene production includes an absorption tank 1, a gas outlet 102 and an absorption liquid discharge port 104 are respectively provided at the top and bottom of the absorption tank 1, an absorption liquid addition port 101 and a waste gas introduction pipe 103 are respectively provided at one side of the absorption tank 1 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 is introduced into the absorption tank 1 through the absorption liquid addition port 101, and the tail gas is introduced into the absorption liquid inside the absorption tank 1 through the waste gas introduction pipe 103. The tail gas is dispersed by the gas distribution mechanism to increase the contact rate between the tail gas and the absorption liquid and improve the absorption effect. The used saturated absorption liquid is discharged through the absorption liquid discharge port 104; The absorption liquid lifting and spraying mechanism 3 is used to draw up the absorption liquid at the bottom of the absorption tank 1. The absorption liquid lifting and spraying mechanism 3 includes a lifting pipe 301. A plurality of absorption liquid sprayers 306 are connected to the lifting pipe 301 near the top. The absorption liquid sprayers 306 are evenly distributed in a circle around the lifting pipe 301. The spraying port of the absorption liquid sprayer 306 is vertically downward, and the height of the absorption liquid sprayer 306 is greater than the liquid level of the absorption liquid in the absorption tank 1. The drawn absorption liquid is sprayed and falls through the absorption liquid sprayer 306, and undergoes secondary contact and absorption with the gas emerging from the absorption liquid, thereby further improving the absorption efficiency.

[0025] Example 2

[0026] Reference Figure 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 distributed in an annular manner at the top of the annular distributor 2, the outer sides of the vertical gas distribution pipes 201 are connected to a plurality of horizontal gas distribution pipes 2011, and exhaust holes are opened on the horizontal gas distribution pipes 2011; The exhaust 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 pipe 2011, and finally discharged through the exhaust hole, which can effectively improve the uniformity of gas distribution and improve the absorption efficiency.

[0027] Example 3

[0028] Reference Figure 1-12 , the difference between this embodiment and embodiment 2 is that the exhaust gas inlet pipe 103 is rotatably mounted with the turbine blade 1032 through the 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, the outsides of multiple vertical gas distribution pipes 201 are all fixed with first spur gears 203, the top of the annular distributor 2 is rotatably mounted with a synchronous gear ring 204, and the multiple first spur gears 203 are all meshed with the synchronous gear ring 204, and the outside of one of the vertical gas distribution pipes 201 is fixed with a second bevel gear 202, and the first bevel gear 1033 is meshed with the second bevel gear 202; After the exhaust gas is introduced, the exhaust gas will blow the turbine blades 1032, thereby driving the support shaft 1031 to rotate, and then driving the first bevel gear 1033 to rotate. Through the engagement 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 engagement of the first straight gear 203 and the synchronous gear ring 204, multiple vertical gas distribution pipes 201 can be driven to rotate. On the one hand, the gas distribution effect can be further improved. The horizontal gas distribution pipe 2011 can also stir the absorption liquid by following the rotation. No external power input is required, which is more energy-saving and environmentally friendly.

[0029] Example 4

[0030] Reference Figure 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; 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.

[0031] 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; 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.

[0032] Example 5

[0033] Reference Figure 1-12In order to achieve the purpose of automatically switching between the two states as the lifting piston 304 rises and falls, the first transmission member 4 and the second transmission member 401 are rotatably installed near the bottom and the top of the lifting tube 301, respectively. The first transmission member 4 and the second transmission member 401 are both annular columnar structures, and the first transmission member 4 and the second transmission member 401 are both provided with guide slopes 402. The guide slopes 402 on the first transmission member 4 and the second transmission member 401 are symmetrically arranged up and down. The bottom and the top of the lifting piston 304 are respectively fixed with the first trigger rod 3041 and the second trigger rod 3042. The first trigger rod 3041 and the second trigger rod 3042 are staggered with each other. The first transmission member 4 and the second transmission member 401 are fixed to each other with the blocking plate group 307. When the lifting piston 304 moves downward and moves to the lowest position, the first trigger rod 3041 contacts the guide slope 402 at the top of the first transmission member 4, and pushes the first transmission member 4 to rotate, and drives the blocking plate group 307 to rotate an angle, and converts the blocking plate group 307 from the staggered state to the blocked state. When the lifting piston 304 moves upward, the second trigger rod 3042 will move upward and contact the guide slope 402 at the bottom end of the second transmission member 401, and push the first transmission member 4 to rotate in the opposite direction and reset, thereby driving the blocking plate group 307 to rotate in the opposite direction by the same angle, and converting the blocking plate group 307 from the blocked state to the staggered state. It can run automatically without the need for additional driving and control devices, and has a clever structure and stable operation.

[0034] Among them, the first transmission member 4 and the sealing plate group 307 are fixed by the first connecting frame 403, and 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 lifting tube 301 through an arc-shaped opening and is fixed to the sealing plate group 307 by the second connecting frame 405. An arc-shaped sealing strip 406 is fixed on the horizontal connecting rod 404, and the arc-shaped sealing strip 406 is in sliding contact with the outer wall of the lifting tube 301.

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0036] In the present invention, unless otherwise clearly specified and limited, the terms "set", "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] The control method of the present invention is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by technicians in this field. The provision of power is also common knowledge in this field. The present invention is mainly used to protect mechanical devices, so the present invention will no longer explain the control method and circuit connection in detail.

[0038] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A nitration tail gas absorption treatment system for mixed dinitrobenzene production, comprising 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).

2. The nitration tail gas absorption treatment system for mixed dinitrobenzene production according to claim 1, characterized in that: The outer side of the vertical gas distribution pipe (201) is connected to a plurality of horizontal gas distribution pipes (2011), and exhaust holes are provided on the horizontal gas distribution pipes (2011).

3. The nitration tail gas absorption treatment system for mixed dinitrobenzene production according to claim 2, characterized in that: A turbine blade (1032) is rotatably mounted in the exhaust gas inlet pipe (103) via 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). First spur gears (203) are fixed to the outside of the plurality of vertical gas distribution pipes (201). A synchronous gear ring (204) is rotatably mounted on the top of the annular distributor (2), and the plurality of first spur gears (203) are meshed with the synchronous gear ring (204). A second bevel gear (202) is fixed to the outside of one of the vertical gas distribution pipes (201), and the first bevel gear (1033) is meshed with the second bevel gear (202).

4. The nitration tail gas absorption treatment system for mixed dinitrobenzene production according to claim 1, characterized in that: The absorption liquid sprayers (306) are evenly distributed in a ring around the lifting pipe (301), the spraying ports of the absorption liquid sprayers (306) are vertically downward, and the height of the absorption liquid sprayers (306) is greater than the liquid level of the absorption liquid in the absorption tank (1).

5. The nitration tail gas absorption treatment system for mixed dinitrobenzene production according to claim 1, characterized in that: 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). The reciprocating screw rod (303) penetrates the lifting piston (304) through a threaded hole.

6. The nitration tail gas absorption treatment system for mixed dinitrobenzene production according to claim 5, characterized in that: A guide rod (305) is fixed inside the lifting tube (301), and the guide rod (305) passes through the lifting piston (304) through a guide hole.

7. The nitration tail gas absorption treatment system for mixed dinitrobenzene production according to claim 5, characterized in that: 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).

8. The nitration tail gas absorption treatment system for mixed dinitrobenzene production according to claim 7, characterized in that: 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), and a second spur gear (501) is fixed to the output shaft of the rotating motor (5). The 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), and the second spur gear (501) is meshed with the third spur gear (3031).

9. The nitration tail gas absorption treatment system for mixed dinitrobenzene production according to claim 8, characterized in that: A first transmission member (4) and a second transmission member (401) are rotatably mounted in the lifting tube (301) near the bottom and the top, respectively. The first transmission member (4) and the second transmission member (401) are both annular columnar structures, and the first transmission member (4) and the second transmission member (401) are both provided with guiding inclined surfaces (402). 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 and the top of the lifting piston (304). The first trigger rod (3041) and the second trigger rod (3042) are staggered with each other. The first transmission member (4) and the second transmission member (401) are both fixed to the blocking plate group (307).

10. The nitration tail gas absorption treatment system for mixed dinitrobenzene production according to claim 9, characterized in that: The first transmission member (4) is fixed to the sealing plate group (307) via 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) away from the second transmission member (401) extends to the outside of the lifting tube (301) through an arc-shaped opening and is fixed to the sealing plate group (307) via a second connecting frame (405); an arc-shaped sealing strip (406) is fixed to the horizontal connecting rod (404); the arc-shaped sealing strip (406) is in sliding contact with the outer wall of the lifting tube (301).

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