Tail gas absorption tower for O-methyl-N-nitroisourea production

Abstract

The invention relates to the technical field of flue gas treatment, and provides a tail gas absorption tower for O-methyl-N-nitroisourea production, the tail gas absorption tower comprises a shell, the shell is provided with an absorption cavity; one end of the liquid inlet pipe extends out of the absorption cavity, and the other end of the liquid inlet pipe is provided with a first step; the spraying frame is provided with a cavity, the side wall of the cavity is provided with a lap joint part, the spraying frame is rotationally arranged on the liquid inlet pipe, the lap joint part rotationally abuts against the first step, the inner wall of the cavity is provided with a spiral face, the liquid inlet pipe communicates with the cavity, and after spraying liquid passes through the liquid inlet pipe, the spiral face is impacted, so that the spraying frame rotates; the nozzles are arranged on the spraying frame and used for spraying out spraying liquid. By means of the technical scheme, the problem that in the prior art, a spraying head only sprays in one direction, and consequently the absorption effect of tail gas generated in O-methyl-N-nitroisourea production is poor is solved.

Description

Technical Field

[0001] The invention relates to the technical field of flue gas treatment, and in particular to a tail gas absorption tower for the production of O-methyl-N-nitroisourea. Background Art

[0002] In the production process of O-methyl-N-nitroisourea, a large amount of tail gas is generated. These tail gases often contain a variety of harmful components, such as nitrogen oxides, acidic gases and organic waste gases. If they are directly discharged into the atmosphere, they will cause serious pollution to the environment and endanger human health. Therefore, tail gas absorption and treatment has become a crucial link in the production process of O-methyl-N-nitroisourea.

[0003] Traditional tail gas absorbers usually adopt a fixed spray head design, which only sprays in one direction. This single-direction spraying method has many defects. On the one hand, its spray coverage is extremely limited, and it can only treat specific areas in the tail gas absorber. It is impossible to evenly distribute the spray liquid in the entire absorption space, resulting in a large amount of tail gas unable to fully contact with the spray liquid, and many harmful components are difficult to be effectively absorbed. Summary of the invention

[0004] The invention provides a tail gas absorption tower for the production of O-methyl-N-nitroisourea, which solves the problem in the related art that a spray head only sprays in one direction, resulting in poor absorption effect of the tail gas generated by the production of O-methyl-N-nitroisourea.

[0005] The technical solution of the present invention is as follows: A tail gas absorption tower for the production of O-methyl-N-nitroisourea, comprising: A shell having an absorption cavity; A liquid inlet pipe, the liquid inlet pipe is arranged in the absorption chamber, one end of the liquid inlet pipe extends out of the absorption chamber, and the other end of the liquid inlet pipe has a first step; A spray rack, wherein the spray rack has a cavity, the side wall of the cavity has an overlapped portion, the spray rack is rotatably arranged on the liquid inlet pipe, the overlapped portion is rotatably abutted against the first step, the inner wall of the cavity has a spiral surface, the liquid inlet pipe is connected to the cavity, and after the spray liquid passes through the liquid inlet pipe, it impacts the spiral surface, so that the spray rack rotates; Nozzles, the number of which is several, are arranged on the spray rack and are used to spray the spray liquid.

[0006] Optionally, the spray rack has a plurality of mounting parts and further comprises: A swing frame is swingably arranged on the mounting portion, the swing frame has a transition cavity, the transition cavity is communicated with the cavity body, and the nozzle is arranged on the swing frame.

[0007] Optionally, it also includes: A rotating shaft, one end of which is rotatably disposed on the spray rack, and the other end of which has an eccentric protrusion; A slide rod, one end of which is vertically slidably disposed on the eccentric protrusion; A guide rod is arranged at one end of the swing frame away from the nozzle, and the other end of the slide rod is arranged on the guide rod for transverse sliding, after the rotating shaft rotates.

[0008] Optionally, the rotating shaft has teeth, and further comprises: A toothed disc, the toothed disc is arranged on the spray frame, the toothed disc is meshed with the teeth, and the toothed disc has a plurality of positioning holes; A telescopic member, wherein the telescopic member is arranged in the absorption cavity; A positioning rod is arranged at the extended end of the telescopic member. After the telescopic member is extended or retracted, the positioning rod enters or leaves the positioning hole, so that the toothed disc and the spray frame rotate relatively or remain stationary.

[0009] Optionally, the shell has an air inlet and an air outlet, the spray frame, the swing frame, the toothed disc and the nozzle constitute a liquid distribution device, the liquid distribution device has two, and the two liquid distribution devices are vertically spaced apart and arranged in the absorption chamber, and further comprises: The filter layer is arranged in the absorption chamber and located between the two liquid distribution devices, dividing the absorption chamber into a primary spray chamber and a secondary spray chamber, the air inlet is connected to the primary spray chamber, and the air outlet is connected to the secondary spray chamber.

[0010] Optionally, the nozzles of the two liquid distributing devices are close to each other, and the spray liquid is sprayed to impact both sides of the filter layer respectively.

[0011] Optionally, it also includes: The cleaning piece has two cleaning pieces, and the two cleaning pieces are respectively vertically slidably arranged in the primary spray chamber and the secondary spray chamber to scrape off impurities on the inner walls of the primary spray chamber and the secondary spray chamber.

[0012] Optionally, it also includes: A reciprocating screw rod, the two ends of which are respectively arranged on the two spray racks, and rotate synchronously with the spray racks, and the reciprocating screw rod has two sections of reciprocating slide grooves, and the two sections of the reciprocating slide grooves are respectively located in the primary spray chamber and the secondary spray chamber; A slider, one end of which is rotatably arranged on the cleaning piece, and the other end of which is slidably abutted against the reciprocating slide groove. After the reciprocating screw rod rotates, the cleaning piece is driven to slide vertically.

[0013] Optionally, it also includes: A guide member is arranged on the inner wall of the absorption chamber, and the cleaning member slides along the guide member.

[0014] Optionally, the cleaning piece has a plurality of cleaning portions, and the cleaning portions have a first angle with the inner wall of the absorption chamber.

[0015] The working principle and beneficial effects of the present invention are: In the present invention, in order to solve the problem that the spray head in the related art only sprays in one direction, resulting in poor absorption effect of tail gas generated by the production of O-methyl-N-nitroisourea, a tail gas absorption tower is designed. The shell is made of stainless steel, which is cylindrical and has an absorption cavity inside. One end of the liquid inlet pipe extends out of the absorption cavity to connect the external spray liquid storage tank, and the other end extends into the absorption cavity and processes the first step. The spray rack is made of aluminum alloy as a whole, with a cavity inside. The overlapping part of the side wall of the cavity is rotated and abutted with the first step through a bearing to ensure that the spray rack can rotate smoothly. The inner wall of the cavity has a plurality of spiral surfaces. A plurality of nozzles are evenly arranged on the spray rack, and the nozzles are solid spiral nozzles that can spray the spray liquid evenly. When the spray liquid enters the cavity through the liquid inlet pipe, the spray liquid impacts the spiral surface through the liquid inlet pipe. Due to the impact force, the spray rack begins to rotate around the liquid inlet pipe, thereby realizing multi-angle spraying of the spray liquid in the absorption cavity.

[0016] The advantage is that, through the rotation of the spray rack, the spray liquid sprayed from the nozzle can cover a wider area, thereby increasing the contact probability between the exhaust gas and the spray liquid and enhancing the absorption efficiency of the absorption tower for harmful substances in the exhaust gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The preferred implementation modes will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present invention.

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the internal structure of the present invention; Figure 3 Another schematic diagram of the internal structure of the present invention is a cross-section; Figure 4 It is a schematic diagram of the structure of the liquid dispensing device of the present invention; Figure 5 It is a schematic diagram of the internal structure of the liquid dispensing device of the present invention; Figure 6 For the present invention Figure 5 Enlarged view of point A in the middle; Figure 7 This is a schematic structural diagram of the liquid dispensing device of the present invention from another angle; Figure 8 For the present invention Figure 7Enlarged view of point B in the middle; Fig. 9 For the present invention Figure 2 Enlarged view of point C in the middle; Fig.10 For the present invention Figure 3 Enlarged view of point D in the middle.

[0019] In the figure: 1, shell, 101, absorption chamber, 2, liquid inlet pipe, 201, first step, 3, spray frame, 301, cavity, 302, overlap part, 303, spiral surface, 4, nozzle, 304, installation part, 5, swing frame, 6, rotating shaft, 602, eccentric protrusion, 7, sliding rod, 8, guide rod, 601, teeth, 9, toothed disc, 901, positioning hole, 10, telescopic part, 15, positioning rod, 102, air inlet, 103, air outlet, 11, filter layer, 1011, primary spray chamber, 1012, secondary spray chamber, 12, cleaning part, 13, reciprocating screw rod, 1301, reciprocating slide groove, 14, slider, 1201, cleaning part, 16, guide part. DETAILED DESCRIPTION

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0021] In order to simplify the drawings, only the parts related to the invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically shown, or only one of them is marked. In this article, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".

[0022] In this document, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0024] Reference Figures 1 to 10 , which is the first embodiment of the present invention, proposes a tail gas absorption tower for O-methyl-N-nitroisourea production, including a shell 1, the shell 1 has an absorption chamber 101; a liquid inlet pipe 2 is arranged in the absorption chamber 101, one end of the liquid inlet pipe 2 extends out of the absorption chamber 101, and the other end has a first step 201; a spray rack 3 has a cavity 301, and the side wall of the cavity 301 has a lap portion 302, the spray rack 3 is rotatably arranged on the liquid inlet pipe 2, the lap portion 302 is rotatably abutted against the first step 201, the inner wall of the cavity 301 has a spiral surface 303, the liquid inlet pipe 2 is connected to the cavity 301, and after the spray liquid passes through the liquid inlet pipe 2, it impacts the spiral surface 303, so that the spray rack 3 rotates; a plurality of nozzles 4 are arranged on the spray rack 3 for spraying the spray liquid.

[0025] In this embodiment, in order to solve the problem in the related art that the spray head only sprays in one direction, resulting in poor absorption effect of tail gas generated by the production of O-methyl-N-nitroisourea, a tail gas absorption tower is designed. The shell 1 is made of stainless steel, which is cylindrical and has an absorption chamber 101 inside. One end of the liquid inlet pipe 2 extends out of the absorption chamber 101 to connect to the external spray liquid storage tank, and the other end extends into the absorption chamber 101 and is processed into a first step 201. The spray rack 3 is made of aluminum alloy as a whole, with a cavity 301 inside. The lap joint 302 of the side wall of the cavity 301 is rotatably abutted with the first step 201 through a bearing to ensure that the spray rack 3 can rotate smoothly. The inner wall of the cavity 301 has a plurality of spiral surfaces 303. A plurality of nozzles 4 are evenly arranged on the spray rack 3, and the nozzle 4 is a solid spiral nozzle that can spray the spray liquid evenly. When the spray liquid enters the cavity 301 through the liquid inlet pipe, the spray liquid impacts the spiral surface 303 through the liquid inlet pipe 2. Due to the impact force, the spray frame 3 begins to rotate around the liquid inlet pipe 2, thereby realizing multi-angle spraying of the spray liquid in the absorption cavity 101.

[0026] The advantage is that, through the rotation of the spray rack 3, the spray liquid sprayed from the nozzle 4 can cover a wider area, thereby increasing the contact probability between the exhaust gas and the spray liquid and enhancing the absorption efficiency of the absorption tower for harmful substances in the exhaust gas.

[0027] Furthermore, the spray rack 3 has a plurality of mounting portions 304 , and also includes a swing rack 5 , which is swingably disposed on the mounting portions 304 , has a transition cavity, which is connected to the cavity 301 , and the nozzle 4 is disposed on the swing rack 5 .

[0028] In this embodiment, the mounting portion 304 on the spray rack 3 is a metal bracket, which is evenly distributed on the spray rack 3. The swing rack 5 is made of a light alloy material, and is swingably arranged on the mounting portion 304. The swing rack 5 has a transition cavity inside, and the transition cavity is connected to the cavity 301 of the spray rack 3 through a pipeline to ensure that the spray liquid can flow smoothly. Three nozzles 4 are installed at the other end of the swing rack 5, and the nozzle direction of the nozzle 4 is at a certain angle to the swing direction of the swing rack 5, so as to change the spray direction of the spray liquid during the swinging process. When the spray liquid enters the cavity 301 and flows to the transition cavity, due to the swinging of the swing rack 5, the coverage of the spray liquid sprayed from the nozzle 4 is further expanded.

[0029] The advantage is that the setting of the swing frame 5 increases the flexibility and randomness of the spray liquid injection, further expands the coverage area of ​​the spray liquid in the absorption chamber 101, and can more effectively capture and absorb some exhaust components that are easy to gather in specific areas. In addition, combined with the rotation of the spray frame 3, a multi-dimensional spray mode is formed, which greatly improves the treatment effect and adaptability of the exhaust gas absorption tower, and can treat exhaust gas with more complex components. At the same time, the swing spray can also spray the spray liquid onto the inner wall of the absorption chamber 101, effectively preventing the easily attached substances in the gas to be treated from adhering to the inner wall of the absorption chamber 101.

[0030] Furthermore, it also includes a rotating shaft 6, one end of which is rotatably set on the spray frame 3, and the other end of the rotating shaft 6 has an eccentric protrusion 602; one end of the sliding rod 7 is vertically slidably set on the eccentric protrusion 602; the guide rod 8 is set at the end of the swing frame 5 away from the nozzle 4, and the other end of the sliding rod 7 is horizontally slidably set on the guide rod 8, after the rotating shaft 6 rotates.

[0031] In this embodiment, one end of the rotating shaft 6 is rotatably disposed on the spray frame 3, and the other end has an eccentric protrusion 602. One end of the slide bar 7 is vertically slidably disposed on the eccentric protrusion 602, and the other end of the slide bar 7 transversely passes through a guide rod 8 disposed at the end of the swing frame 5 away from the nozzle 4. When the rotating shaft 6 rotates, the eccentric protrusion 602 drives one end of the slide bar 7 to make a circular motion, and because the other end of the slide bar 7 is restricted by the guide rod 8, it can only slide transversely, thereby converting the rotational motion of the rotating shaft 6 into the swinging motion of the swing frame 5.

[0032] The advantage is that it provides a stable and reliable driving method for the swing frame 5, which converts the rotation of the rotating shaft 6 into a specific movement of the slide rod 7, thereby accurately controlling the swing amplitude and frequency of the swing frame 5, and is easy to maintain and overhaul, reducing the downtime and maintenance costs of the equipment.

[0033] Furthermore, the rotating shaft 6 has teeth 601 and also includes a toothed disc 9, which is arranged on the spray rack 3 and meshes with the teeth 601. The toothed disc 9 has a plurality of positioning holes 901; the telescopic member 10 is arranged in the absorption chamber 101; the positioning rod 15 is arranged at the extended end of the telescopic member 10, and after the telescopic member 10 is extended and retracted, the positioning rod 15 enters or disengages from the positioning hole 901, so that the toothed disc 9 and the spray rack 3 rotate relative to each other or remain stationary.

[0034] In this embodiment, the rotating shaft 6 is provided with teeth 601, which are evenly distributed along the outer periphery of the rotating shaft 6. The toothed disc 9 is arranged on the swing frame 5 to realize relative rotation, and the toothed disc 9 is meshed with the teeth 601. The toothed disc 9 is provided with positioning holes 901, which are evenly distributed on the outer periphery of the toothed disc 9. The telescopic member 10 adopts an electric telescopic rod, which is installed on the bracket in the absorption chamber 101, and the positioning rod 15 is installed on the extended end of the telescopic member 10. When the swing frame 5 needs to swing, the telescopic member 10 extends, so that the positioning rod 15 enters the positioning hole 901, so that the toothed disc 9 and the spray frame 3 rotate relative to each other. Since the rotating shaft 6 and the spray frame 3 rotate synchronously, and the toothed disc 9 is meshed with the teeth 601, when the toothed disc 9 and the spray frame 3 rotate relative to each other, the toothed disc 9 drives the rotating shaft 6 to rotate. When the swing frame 5 needs to stop, the positioning rod 15 is retracted, so that the spray frame 3 can drive the toothed disc 9 to rotate synchronously, and at this time, the spray frame 3, the toothed disc 9 and the rotating shaft 6 are all in a relatively static state. The precise control of the movement state of the swing frame 5 is achieved, and the intelligence level and operation stability of the entire equipment are improved.

[0035] Furthermore, the shell 1 has an air inlet 102 and an air outlet 103, and the spray frame 3, the swing frame 5, the toothed disc 9 and the nozzle 4 constitute a liquid distribution device. There are two liquid distribution devices, and the two liquid distribution devices are vertically spaced apart in the absorption chamber 101. It also includes a filter layer 11. The filter layer 11 is arranged in the absorption chamber 101 and is located between adjacent liquid distribution devices, dividing the absorption chamber 101 into a primary spray chamber 1011 and a secondary spray chamber 1012. The air inlet 102 is connected to the primary spray chamber 1011, and the air outlet 103 is connected to the secondary spray chamber 1012.

[0036] In this embodiment, the air inlet 102 of the shell 1 is located at one end of the bottom of the shell 1, and is connected to the tail gas discharge port of the O-methyl-N-nitroisourea production equipment through a pipeline. The air outlet 103 is located at the other end of the top of the shell 1. The two liquid distribution devices are respectively located at the upper and lower parts of the absorption chamber 101. The filter layer 11 is made of a mixed material of multiple layers of activated carbon fiber and glass fiber, and is fixed in the absorption chamber 101 by a metal frame, which divides the absorption chamber 101 into a primary spray chamber 1011 and a secondary spray chamber 1012. The tail gas enters the primary spray chamber 1011 from the air inlet 102, is first sprayed by the lower liquid distribution device, and then passes through the filter layer 11 to enter the secondary spray chamber 1012, and then is discharged from the air outlet 103 after a secondary spray treatment by the upper liquid distribution device. When treating tail gas containing a variety of organic waste gases and acid gases, this two-stage spray structure can first remove most of the acid gases through the first-stage spray, and then further remove the organic waste gases through the second-stage spray and the filter layer 11, thereby improving the tail gas purification effect.

[0037] The advantage is that the vertical spacing of the two liquid distribution devices reasonably utilizes the space of the absorption chamber 101, improves the space utilization rate of the equipment, and to a certain extent reduces the floor space of the equipment, thereby reducing the manufacturing cost and installation cost of the equipment.

[0038] Furthermore, the nozzles 4 of the two liquid distributing devices are close to each other, and the sprayed liquid impacts the two sides of the filter layer 11 respectively.

[0039] In this embodiment, the nozzle 4 of the lower liquid distributing device sprays upward, and the nozzle 4 of the upper liquid distributing device sprays downward. When the spray liquid is sprayed from the nozzles 4 of the two liquid distributing devices, the spray liquid sprayed from the lower liquid distributing device impacts the lower side of the filter layer 11, which can initially intercept the dust in the tail gas and dissolve some harmful gases in the spray liquid. At the same time, the spray liquid sprayed from the upper liquid distributing device impacts the upper side of the filter layer 11, which can further clean the filter layer 11 to prevent it from being blocked, and on the other hand, perform secondary absorption treatment on the residual harmful gases that pass through the filter layer 11, thereby improving the treatment efficiency and reliability of the entire tail gas absorption tower.

[0040] The advantage is that the opposite spray direction design enables the spray liquid to flush the filter layer 11 on both sides, which not only improves the filtering effect and service life of the filter layer 11, but also enhances the ability to absorb and remove harmful substances in the exhaust gas.

[0041] Furthermore, it also includes a cleaning piece 12, which has two cleaning pieces 12. The two cleaning pieces 12 are respectively vertically slidably arranged in the first-level spray chamber 1011 and the second-level spray chamber 1012 to scrape off impurities on the inner walls of the first-level spray chamber 1011 and the second-level spray chamber 1012.

[0042] In this embodiment, when the exhaust gas absorption tower is in operation, the cleaning member 12 slides up and down along the slide rail under the action of the driving device, and the cleaning part 1201 is in close contact with the inner wall of the absorption chamber 101, scraping off impurities such as dirt and crystals accumulated on the inner wall to prevent them from affecting the normal operation of the absorption tower and the exhaust gas treatment effect.

[0043] The advantage is that the impurities on the inner wall of the absorption chamber 101 can be cleaned in time to avoid the negative impact of impurity accumulation on the tail gas absorption efficiency, thereby ensuring the long-term stable operation of the tail gas absorption tower.

[0044] Furthermore, it also includes a reciprocating screw rod 13, both ends of which are respectively arranged on two spray racks 3, and rotate synchronously with the spray rack 3. The reciprocating screw rod 13 has two sections of reciprocating slide grooves 1301, and the two sections of reciprocating slide grooves 1301 are respectively located in the first-level spray chamber 1011 and the second-level spray chamber 1012; one end of the slider 14 is rotatably arranged on the cleaning piece 12, and the other end is slidably abutted with the reciprocating slide groove 1301. After the reciprocating screw rod 13 rotates, it drives the cleaning piece 12 to slide vertically.

[0045] In this embodiment, the spiral surface 303 in the upper and lower spray racks 3 rotates in opposite directions, ensuring that the upper and lower spray racks 3 rotate in the same direction. The two ends of the reciprocating screw rod 13 are respectively connected to the upper and lower spray racks 3 through a coupling to ensure synchronous rotation with the spray rack 3. The reciprocating screw rod 13 is provided with two sections of reciprocating slide grooves 1301, which are respectively located at the positions corresponding to the primary spray chamber 1011 and the secondary spray chamber 1012. The slider 14 has a circular protrusion at one end, and the cleaning member 12 has a circular groove on the inner side, which cooperates with each other to realize the rotation setting, and the other end is embedded in the reciprocating slide groove 1301 and can slide smoothly. When the spray rack 3 rotates under the drive of the spray liquid, the reciprocating screw rod 13 rotates synchronously, so that the slider 14 slides in the reciprocating slide groove 1301, thereby driving the cleaning member 12 to slide vertically back and forth in the primary spray chamber 1011 and the secondary spray chamber 1012.

[0046] The advantage is that the rotation of the spray rack 3 is used to drive the movement of the cleaning member 12, thereby realizing the automatic linkage between exhaust gas absorption and equipment cleaning, without the need to set up an additional complex cleaning drive device, simplifying the equipment structure and reducing the equipment cost.

[0047] Furthermore, it also includes a guide member 16 , which is arranged on the inner wall of the absorption chamber 101 , and the cleaning member 12 slides along the guide member 16 .

[0048] In this embodiment, the length of the guide member 16 matches the height of the absorption chamber 101, and is fixed to the inner wall of the absorption chamber 101 by welding. The cleaning member 12 is provided with a through hole adapted to the guide member 16, and the cleaning member 12 is sleeved on the guide member 16 through the through hole and can slide vertically along the guide member 16. During the movement of the cleaning member 12 driven by the reciprocating screw 13, the guide member 16 plays a role in stabilizing the movement trajectory of the cleaning member 12, preventing the cleaning member 12 from deflecting or shaking during the sliding process, ensuring that the cleaning part 1201 can evenly scrape off impurities on the inner wall, thereby improving the cleaning effect and the stability of the equipment operation.

[0049] Furthermore, the cleaning member 12 has a plurality of cleaning portions 1201 , and the cleaning portions 1201 and the inner wall of the absorption chamber 101 have a first angle.

[0050] In this embodiment, the angle between the cleaning portion 1201 of the cleaning member 12 and the inner wall of the absorption chamber 101 is 45 degrees. During the cleaning process, for example, after processing tail gas containing viscous impurities, when the cleaning member 12 slides vertically, this angle enables the cleaning portion 1201 to better cut into the impurity layer, and the impurities are effectively scraped off and pushed to slide downward by the inclined surface of the cleaning portion 1201, so as to facilitate collection and cleaning. At the same time, the angle of 45 degrees can reduce the friction resistance between the cleaning portion 1201 and the inner wall, reduce the wear of the cleaning member 12, and extend the service life of the cleaning member 12 while ensuring the cleaning effect.

[0051] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A tail gas absorption tower for the production of O-methyl-N-nitroisourea, characterized in that: include; A shell (1), wherein the shell (1) has an absorption chamber (101); a liquid inlet pipe (2), the liquid inlet pipe (2) being arranged in the absorption chamber (101), one end of the liquid inlet pipe (2) extending out of the absorption chamber (101), and the other end of the liquid inlet pipe (2) having a first step (201); A spray rack (3), the spray rack (3) having a cavity (301), the side wall of the cavity (301) having an overlap portion (302), the spray rack (3) being rotatably arranged on the liquid inlet pipe (2), the overlap portion (302) being rotatably abutted against the first step (201), the inner wall of the cavity (301) having a spiral surface (303), the liquid inlet pipe (2) being connected to the cavity (301), and after the spray liquid passes through the liquid inlet pipe (2), it impacts the spiral surface (303), thereby causing the spray rack (3) to rotate; Nozzles (4), the number of the nozzles (4) being several, the nozzles (4) being arranged on the spray frame (3) and being used to spray the spray liquid.

2. The tail gas absorption tower for the production of O-methyl-N-nitroisourea according to claim 1, characterized in that: The spray rack (3) has a plurality of mounting parts (304), and further comprises: A swing frame (5), the swing frame (5) being swingably arranged on the mounting portion (304), the swing frame (5) having a transition cavity, the transition cavity being in communication with the cavity body (301), and the nozzle (4) being arranged on the swing frame (5).

3. The tail gas absorption tower for the production of O-methyl-N-nitroisourea according to claim 2, characterized in that: Also includes: A rotating shaft (6), one end of the rotating shaft (6) being rotatably disposed on the spray frame (3), and the other end of the rotating shaft (6) being provided with an eccentric protrusion (602); A sliding rod (7), one end of the sliding rod (7) being vertically slidably disposed on the eccentric protrusion (602); A guide rod (8), wherein the guide rod (8) is arranged at one end of the swing frame (5) away from the nozzle (4), and the other end of the slide rod (7) is arranged on the guide rod (8) in a transverse sliding manner, after the rotating shaft (6) rotates.

4. The tail gas absorption tower for the production of O-methyl-N-nitroisourea according to claim 3, characterized in that: The rotating shaft (6) has teeth (601) and further comprises: A toothed disc (9), the toothed disc (9) being arranged on the spray frame (3), the toothed disc (9) being meshed with the teeth (601), and the toothed disc (9) having a plurality of positioning holes (901); A telescopic member (10), the telescopic member (10) being arranged in the absorption chamber (101); A positioning rod (15), the positioning rod (15) being arranged at the extended end of the telescopic member (10); after the telescopic member (10) is extended or retracted, the positioning rod (15) enters or leaves the positioning hole (901), causing the toothed disc (9) and the spray frame (3) to rotate relative to each other or to remain stationary.

5. The tail gas absorption tower for the production of O-methyl-N-nitroisourea according to claim 4, characterized in that: The shell (1) has an air inlet (102) and an air outlet (103); the spray frame (3), the swing frame (5), the toothed disc (9) and the nozzle (4) form a liquid distribution device; the liquid distribution device has two liquid distribution devices, the two liquid distribution devices are vertically spaced apart and arranged in the absorption chamber (101); and further comprises: A filter layer (11), the filter layer (11) being arranged in the absorption chamber (101) and between the two liquid distributing devices, dividing the absorption chamber (101) into a primary spray chamber (1011) and a secondary spray chamber (1012), the air inlet (102) being connected to the primary spray chamber (1011), and the air outlet (103) being connected to the secondary spray chamber (1012).

6. The tail gas absorption tower for the production of O-methyl-N-nitroisourea according to claim 5, characterized in that: The nozzles (4) of the two liquid distributing devices are close to each other, and the spray liquid is sprayed to impact the two sides of the filter layer (11) respectively.

7. The tail gas absorption tower for the production of O-methyl-N-nitroisourea according to claim 5, characterized in that: Also includes: A cleaning piece (12), wherein the cleaning piece (12) comprises two pieces, and the two cleaning pieces (12) are respectively vertically slidably disposed in the primary spray chamber (1011) and the secondary spray chamber (1012), and are used to scrape away impurities on the inner walls of the primary spray chamber (1011) and the secondary spray chamber (1012).

8. The tail gas absorption tower for the production of O-methyl-N-nitroisourea according to claim 7, characterized in that: Also includes: A reciprocating screw rod (13), the two ends of the reciprocating screw rod (13) being respectively arranged on the two spray racks (3) and rotating synchronously with the spray racks (3), the reciprocating screw rod (13) having two sections of reciprocating slide grooves (1301), the two sections of the reciprocating slide grooves (1301) being respectively located in the primary spray chamber (1011) and the secondary spray chamber (1012); A slider (14), one end of the slider (14) is rotatably disposed on the cleaning member (12), and the other end is slidably abutted against the reciprocating slide groove (1301), and after the reciprocating screw rod (13) rotates, it drives the cleaning member (12) to slide vertically.

9. The tail gas absorption tower for the production of O-methyl-N-nitroisourea according to claim 8, characterized in that: Also includes: A guide member (16), wherein the guide member (16) is arranged on the inner wall of the absorption chamber (101), and the cleaning member (12) slides along the guide member (16).

10. The tail gas absorption tower for the production of O-methyl-N-nitroisourea according to claim 7, characterized in that: The cleaning member (12) has a plurality of cleaning portions (1201), and the cleaning portions (1201) and the inner wall of the absorption chamber (101) form a first angle.

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