Melamine tail gas treatment equipment
By designing melamine tail gas treatment equipment, ammonia and carbon dioxide are recovered through gas-liquid contact reaction to produce ammonium bicarbonate, which solves the problem of environmental protection treatment of tail gas, reduces costs, and realizes resource recycling.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- XINJI JIULI CHEM CO LTD
- Filing Date
- 2026-04-18
- Publication Date
- 2026-05-19
AI Technical Summary
The lack of effective recovery measures for melamine exhaust gas during the emission process resulted in the unutilization of ammonia and carbon dioxide components, leading to high environmental treatment costs and serious resource waste.
A melamine tail gas treatment device was designed, including an absorption tower, a carbonization tower, a cooling component, a neutralization component, and a recovery component. It recovers ammonia and carbon dioxide through gas-liquid contact reaction, prepares ammonium bicarbonate, and uses lime kiln gas to neutralize carbon dioxide, thereby achieving resource recycling.
It effectively recovers ammonia and carbon dioxide from melamine tail gas, reduces treatment costs, enhances the dissolution capacity of lime kiln gas dust, reduces spray liquid consumption, and achieves resource recycling and environmentally friendly treatment.
Smart Images
Figure CN122057348A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of melamine tail gas treatment technology, and specifically relates to a melamine tail gas treatment device. Background Technology
[0002] Melamine tail gas is the main by-product gas produced during the melamine production process. Its core components are high-concentration ammonia and carbon dioxide. In some processes, it also contains unreacted urea vapor, melamine dust and a small amount of inert gas. If not handled properly, it may lead to the deterioration of air quality in the factory area and surrounding environment. Currently, due to the lack of effective recovery measures during the emission of melamine tail gas, the ammonia and carbon dioxide components in the melamine tail gas cannot be effectively utilized. This makes it difficult to solve the environmental protection problem of melamine tail gas treatment while simultaneously achieving resource recovery, resulting in high treatment costs for melamine tail gas. Based on this, we propose a melamine tail gas treatment device to solve the above problems. Summary of the Invention
[0003] The purpose of this invention is to provide a melamine tail gas treatment device that solves the environmental protection problem of melamine tail gas treatment, while also realizing the recycling of resources and effectively controlling the treatment cost of melamine tail gas.
[0004] To achieve the above objectives, embodiments of the present invention provide a melamine tail gas treatment device, comprising: A substrate, with an absorption tower and a carbonization tower fixedly connected to its top end, a transfer pump A fixedly connected to the outside of the absorption tower, an external inlet pipe A fixedly connected to the output end of the transfer pump A, the end of the external inlet pipe A away from the transfer pump A being connected to the absorption tower, and a transfer pipe A fixedly connected to the output end of the transfer pump A, and the end of the transfer pipe A away from the transfer pump A being connected to the liquid inlet of the carbonization tower. A cooling component is mounted on the top of a substrate and is used in conjunction with an absorption tower to adsorb ammonia gas from melamine tail gas. A neutralization component, assembled on the top of a substrate, is used to balance ammonia and carbon dioxide and to prepare ammonium bicarbonate in conjunction with a carbonization tower.
[0005] In one possible implementation, the cooling component includes: A cooling tank is fixedly connected to the top of the base plate. An exhaust gas transmission pipe is fixedly connected inside the cooling tank. A transmission pipe B is fixedly connected to the bottom end of the exhaust gas transmission pipe, and the end of the transmission pipe B away from the cooling tank is connected to the air inlet pipe of the absorption tower. A transfer pump B is fixedly connected to the outside of the cooling tank. An external lead pipe B is fixedly connected to the input end of the transfer pump B, and the end of the external lead pipe B away from the transfer pump B is also connected to the cooling tank. A transfer pipe B is fixedly connected to the output end of the transfer pump B, and a return pipe is fixedly connected to the top of the outside of the cooling tank.
[0006] In one possible implementation, the neutralizing component includes: A liquid storage tank is fixedly connected to the top of the base plate. A heat exchange tube is fixedly connected to the bottom of the liquid storage tank. The end of the transmission pipe B away from the transmission pump B is fixedly connected to one end of the heat exchange tube, and the other end of the heat exchange tube is connected to the return pipe. Two upright plates are fixedly connected to the top of the liquid storage tank, and a dust collection box is fixedly connected between the tops of the two upright plates. A spray assembly is installed between a dust settling box and a liquid storage tank, and the spray assembly is used to absorb dust in lime kiln gas. A recovery component, which is assembled between the dust settling box and the liquid storage tank, is used to recover the liquid sprayed by the spraying component; A transfer pipe C is fixedly connected to the top of the dust settling box. An electrostatic precipitator and an air compressor are fixedly connected to the top of the base plate. The end of the transfer pipe C away from the dust settling box is connected to the air inlet of the electrostatic precipitator. An air supply pipe A is fixedly connected to the air outlet of the electrostatic precipitator. The end of the air supply pipe A away from the electrostatic precipitator is fixedly connected to the input of the air compressor. An air supply pipe B is fixedly connected to the output of the air compressor. The end of the air supply pipe B away from the air compressor is connected to the air inlet of the carbonization tower.
[0007] In one possible implementation, the spray assembly includes: The spray pipe is fixedly connected to the top of the dust settling box. Multiple air distribution plates are fixedly connected at an incline inside the dust settling box to extend the flow path of the lime kiln gas. A transfer pump C is fixedly connected to the outside of the dust settling box. An external lead pipe C is fixedly connected to the output end of the transfer pump C. The end of the external lead pipe C away from the transfer pump C is also fixedly connected to a spray pipe. A transfer pipe C is fixedly connected to the input end of the transfer pump C, and the end of the transfer pipe C away from the transfer pump C is also connected to a liquid storage tank.
[0008] In one possible implementation, the recycling component includes: An assembly cylinder is provided, in which multiple filter plates are fixedly connected. A recovery pipe A is fixedly connected to the top of the liquid storage tank, and a recovery pipe B is fixedly connected to the bottom of the dust settling box. The assembly cylinder is positioned between the recovery pipe A and the recovery pipe B. Two fixed clamping plates are respectively fixedly connected to the ends of the recovery pipe B and the recovery pipe A that are close to each other. One end of each fixed clamping plate is rotatably connected to a rotating shaft. A movable clamping plate is fixedly connected to the rotating shaft. An eccentric plate is fixedly connected to the top of the rotating shaft. A through groove A is opened in the middle of the eccentric plate. Two extension seats are fixedly connected to both sides of one of the upright plates. A transmission screw is rotatably connected between the two extension seats. A displacement frame is threaded onto the transmission screw. Guide rods are fixedly connected to the top and bottom of the displacement frame. The two guide rods are movably connected inside the two through slots A. A flow control assembly for limiting the flow of liquid at the recovery pipe B.
[0009] In one possible implementation, the flow control component includes: A flow control shaft is rotatably connected to one side of the recovery pipe B. A sealing plate is fixedly connected to one end of the flow control shaft inside the recovery pipe B, and an adjusting plate is fixedly connected to the other end of the flow control shaft outside the recovery pipe B. A through groove B is opened in the middle of the adjusting plate. A push rod is fixedly connected to the top of one side of the displacement frame, and one end of the push rod is movably connected to the inside of the through groove B.
[0010] In one possible implementation, the exhaust gas transmission pipe is spiral-shaped, with its top extending to the outside of the cooling tank.
[0011] In one possible implementation, the bottom end of the spray pipe is provided with multiple spray holes, and each spray hole is fixedly connected to an atomizing nozzle.
[0012] In one possible implementation, both the fixed clamping plate and the movable clamping plate are arc-shaped, and anti-slip pads are fixedly connected inside both the fixed clamping plate and the movable clamping plate, with anti-slip patterns formed on the anti-slip pads.
[0013] In one possible implementation, a sealing groove is provided on the outer side of the sealing piece, and a sealing ring is fixedly connected inside the sealing groove.
[0014] The significant technical effects of the embodiments of the present invention are as follows: Through the overall structural coordination, it is possible to effectively extract ammonia and carbon dioxide components from melamine tail gas and neutralize them with carbon dioxide components from lime kiln gas to form raw material gas for sodium bicarbonate preparation. This solves the environmental protection problem of melamine tail gas treatment, realizes resource recycling, and effectively controls the treatment cost of melamine tail gas. By circulating the heat exchange liquid between the storage tank and the transfer pipe B, the spray liquid of the lime kiln gas can be preheated to enhance the ability to dissolve and capture dust in the lime kiln gas, avoid cold water directly contacting the high temperature lime kiln gas, and prevent thermal stress damage to the equipment. Through the structural coordination of the recycling components, the liquid sprayed from the spray pipes can be effectively recycled, greatly reducing the consumption of spray liquid. Attached Figure Description
[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0016] Figure 1 This is a schematic diagram of the structure of a melamine tail gas treatment device in one embodiment of the present invention; Figure 2 for Figure 1 Side view of the overall structure; Figure 3 for Figure 1 Schematic diagram of the cooling component; Figure 4 for Figure 3 Schematic diagram of the assembly structure of the transmission tube; Figure 5 for Figure 1 A schematic diagram of the structure of the neutralizing component; Figure 6 for Figure 5 Schematic diagram of the internal structure of the dust settling chamber; Figure 7 for Figure 6 Schematic diagram of the assembly structure of the central spray pipe; Figure 8 for Figure 7 A schematic diagram of the structure of the recycling component; Figure 9 for Figure 8 Schematic diagram of the assembly structure of the moving clamp; Figure 10 for Figure 8 A schematic diagram of the assembly structure of the mid-range displacement frame.
[0017] In the diagram: 1. Substrate; 2. Absorption tower; 3. Carbonization tower; 4. Transfer pump A; 5. External inlet pipe A; 6. Transfer pipe A; 7. Cooling assembly; 8. Neutralization assembly; 9. Cooling tank; 10. Tail gas transfer pipe; 11. Transfer pipe B; 12. Transfer pump B; 13. External inlet pipe B; 14. Transfer pipe B; 15. Return pipe; 16. Liquid storage tank; 17. Heat exchanger tube; 18. Vertical plate; 19. Dust settling box; 20. Gas distribution plate; 21. Spray pipe; 22. Transfer pump C; 23. External inlet pipe C; 24. Transfer pipe C; 2 5. Recycling component; 26. Transfer pipe C; 27. Electrostatic precipitator; 28. Air supply pipe A; 29. Air compressor; 30. Air supply pipe B; 31. Assembly cylinder; 32. Filter plate; 33. Recycling pipe A; 34. Recycling pipe B; 35. Fixed clamping plate; 36. Rotating shaft; 37. Moving clamping plate; 38. Eccentric plate; 39. Through slot A; 40. Extension seat; 41. Transmission screw; 42. Displacement frame; 43. Guide rod; 44. Flow control shaft rod; 45. Sealing plate; 46. Adjusting plate; 47. Through slot B; 48. Push rod. Detailed Implementation
[0018] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.
[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.
[0020] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.
[0021] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.
[0022] In the description of the embodiments of this application, the term "and / or" is merely a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship. In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).
[0023] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.
[0024] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation", "connection", "linking", and "fixing" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components.
[0025] Please see Figures 1-10 It illustrates a melamine tail gas treatment device according to an embodiment of the present invention, comprising: A substrate 1 is fixedly connected to an absorption tower 2 and a carbonization tower 3. A transfer pump A4 is fixedly connected to the outside of the absorption tower 2. An external lead pipe A5 is fixedly connected to the output end of the transfer pump A4. The end of the external lead pipe A5 away from the transfer pump A4 is connected to the absorption tower 2. A transfer pipe A6 is fixedly connected to the output end of the transfer pump A4, and the end of the transfer pipe A6 away from the transfer pump A4 is also connected to the liquid inlet end of the carbonization tower 3. Cooling component 7 is assembled on the top of substrate 1. Cooling component 7 is used in conjunction with absorption tower 2 to adsorb ammonia gas in melamine tail gas. Neutralization component 8 is assembled on the top of substrate 1. Neutralization component 8 is used to balance ammonia and carbon dioxide and to prepare ammonium bicarbonate in conjunction with carbonization tower 3. More specifically, absorption tower 2 includes: The tower body is a gas-liquid contact reaction vessel, with a pressure resistance of 0.1-0.2 MPa; Packing layers and trays are used to provide a gas-liquid mass transfer interface, increase the gas-liquid contact area, and improve absorption efficiency. Liquid distributors are used to ensure that the liquid is evenly distributed across the cross-section of the tower. Gas distributors are used to prevent gas flow deviation and ensure mass transfer efficiency. The inlet pipe, used to introduce melamine tail gas, is located at the bottom of the tower; The exhaust pipe, used to discharge unabsorbed gas, is located at the top of the tower. The inlet pipe introduces the absorbent liquid, located at the top of the tower. The liquid outlet pipe, used to discharge concentrated ammonia water, is located at the bottom of the tower; In summary, achieving efficient recovery of ammonia and carbon dioxide through countercurrent gas-liquid contact is a mature existing technology and will not be elaborated further here. Furthermore, the carbonization tower 3 mainly consists of a tower body, a gas distributor, a cooling system, a crystallization separation section, and a feed and discharge system. Its working principle is to use concentrated ammonia water obtained from melamine tail gas absorption and supplemented carbon dioxide to carry out a bubbling carbonization reaction in the tower. After thickening and centrifugal separation, ammonium bicarbonate product is obtained. Unreacted gas is discharged from the top of the tower. This is a mature existing technology and will not be described in detail here. Please refer to Figure 3 In some embodiments, the cooling component 7 includes: Cooling tank 9 is fixedly connected to the top of substrate 1. A tail gas transmission pipe 10 is fixedly connected inside the cooling tank 9. A transmission pipe B11 is fixedly connected to the bottom end of the tail gas transmission pipe 10, and the end of the transmission pipe B11 away from the cooling tank 9 is connected to the air inlet pipe of the absorption tower 2. Transfer pump B12 is fixedly connected to the outside of cooling tank 9. The input end of transfer pump B12 is fixedly connected to external lead pipe B13, and the end of external lead pipe B13 away from transfer pump B12 is also connected to cooling tank 9. The output end of transfer pump B12 is fixedly connected to transfer pipe B14, and the top of the outside of cooling tank 9 is fixedly connected to return pipe 15. Please refer to Figure 3 In some embodiments, the exhaust gas transmission pipe 10 is spiral-shaped, and the top of the exhaust gas transmission pipe 10 extends to the outside of the cooling tank 9. More specifically, by utilizing the shape characteristics of the exhaust gas transmission pipe 10, the flow path of melamine exhaust gas inside the cooling tank 9 can be greatly extended, and in conjunction with the liquid inside the cooling tank 9, the melamine exhaust gas can be effectively cooled. More specifically, a replenishment pipe is fixedly connected to one side of the cooling tank 9. With the replenishment pipe, replenishment liquid can be conveniently added to the cooling tank 9 when the liquid inside is insufficient. Please refer to Figure 3In some embodiments, a flange is fixedly connected to one end of the exhaust gas transmission pipe 10 located outside the cooling tank 9. Through the flange, the exhaust gas transmission pipe 10 can be connected to the external melamine exhaust gas pipeline by means of bolts or other connecting parts. Please refer to Figure 5 In some embodiments, the neutralizing component 8 includes: The liquid storage tank 16 is fixedly connected to the top of the substrate 1. The bottom of the liquid storage tank 16 is fixedly connected to the heat exchange tube 17. The end of the transmission tube B14 away from the transmission pump B12 is fixedly connected to one end of the heat exchange tube 17, and the other end of the heat exchange tube 17 is connected to the return pipe 15. Two upright plates 18 are fixedly connected to the top of the liquid storage tank 16, and a dust settling box 19 is fixedly connected between the tops of the two upright plates 18. The spray assembly is installed between the dust settling box 19 and the liquid storage tank 16. The spray assembly is used to absorb dust in the lime kiln gas. Recovery component 25 is assembled between dust settling box 19 and liquid storage tank 16 and is used to recover the liquid sprayed by the spraying component. A transfer pipe C26 is fixedly connected to the top of the dust settling box 19. An electrostatic precipitator 27 and an air compressor 29 are fixedly connected to the top of the base plate 1. The end of the transfer pipe C26 away from the dust settling box 19 is connected to the air inlet of the electrostatic precipitator 27. An air supply pipe A28 is fixedly connected to the air outlet of the electrostatic precipitator 27. The end of the air supply pipe A28 away from the electrostatic precipitator 27 is fixedly connected to the input of the air compressor 29. An air supply pipe B30 is fixedly connected to the output of the air compressor 29. The end of the air supply pipe B30 away from the air compressor 29 is connected to the air inlet of the carbonization tower 3. Please refer to Figure 5 In this embodiment, a gas inlet pipe is fixedly connected to one side of the liquid storage tank 16, and a flange is fixedly connected to the gas inlet pipe. More specifically, the gas inlet pipe allows the lime kiln gas to be conveniently introduced into the dust settling box 19. Please refer to Figure 6 In some embodiments, the spray assembly includes: Spray pipe 21 is fixedly connected to the top of the dust settling box 19. Multiple air distribution plates 20 are fixedly connected to the inside of the dust settling box 19 at an angle to extend the flow path of the lime kiln gas. The transfer pump C22 is fixedly connected to the outside of the dust settling box 19. The output end of the transfer pump C22 is fixedly connected to the external lead pipe C23. The end of the external lead pipe C23 away from the transfer pump C22 is also fixedly connected to the spray pipe 21. The input end of the transfer pump C22 is fixedly connected to the transfer pipe C24, and the end of the transfer pipe C24 away from the transfer pump C22 is also connected to the liquid storage tank 16. Please refer to Figure 6 In some embodiments, the bottom end of the spray pipe 21 is provided with multiple spray holes, and each spray hole is fixedly connected to an atomizing nozzle. More specifically, the spray pipe 21 is spiral-shaped. Through the shape characteristics of the spray pipe 21, it can be used in conjunction with the atomizing nozzle to direct the water flow over a larger area, greatly reducing the spray blind zone of the spray pipe 21. Please refer to Figure 8 In some embodiments, the recycling component 25 includes: Assembly cylinder 31, with multiple filter plates 32 fixedly connected inside the assembly cylinder 31, recovery pipe A33 fixedly connected to the top of liquid storage tank 16, recovery pipe B34 fixedly connected to the bottom of dust settling box 19, and assembly cylinder 31 is located between recovery pipe A33 and recovery pipe B34. Two fixed clamping plates 35 are fixedly connected to the ends of the recovery pipe B34 and the recovery pipe A33 that are close to each other. One end of the fixed clamping plate 35 is rotatably connected to a rotating shaft 36. A movable clamping plate 37 is fixedly connected to the rotating shaft 36. An eccentric plate 38 is fixedly connected to the top of the rotating shaft 36. A through groove A39 is opened in the middle of the eccentric plate 38. Two extension seats 40 are fixedly connected to both sides of one of the upright plates 18. A transmission screw 41 is rotatably connected between the two extension seats 40. A displacement frame 42 is threadedly connected to the transmission screw 41. A guide rod 43 is fixedly connected to the top and bottom of the displacement frame 42, and the two guide rods 43 are movably connected to the inside of the two through slots A39. Flow control assembly, used to restrict liquid flow at recovery tube B34; Please refer to Figure 9 In some embodiments, both the fixed clamping plate 35 and the movable clamping plate 37 are arc-shaped, and both the fixed clamping plate 35 and the movable clamping plate 37 are fixedly connected with anti-slip pads, and anti-slip patterns are formed on the anti-slip pads. More specifically, through the structural characteristics of the fixed clamping plate 35 and the movable clamping plate 37, the fixed clamping plate 35 and the movable clamping plate 37 can contact the assembly cylinder 31 to a greater extent, and the presence of the anti-slip pad can increase the friction when the fixed clamping plate 35 and the movable clamping plate 37 contact the assembly cylinder 31, thus preventing the assembly cylinder 31 from becoming loose. Please refer to Figure 8 In this embodiment, sealing gaskets are fixedly connected to the top of the recovery tube A33, the bottom of the recovery tube B34, and the top and bottom of the assembly tube 31. More specifically, by setting the sealing gasket, the connection gaps between the assembly cylinder 31 and the recovery pipe A33, and between the recovery pipe B34 and the assembly cylinder 31, can be sealed to prevent liquid from flowing out from the connection gaps; Please refer to Figure 8In this embodiment, an observation window is provided on the outer side of the assembly cylinder 31, so that personnel can observe the saturation status of the filter plate 32 through the observation window. In this embodiment, the filter plate 32 can be made of activated carbon; Please refer to Figure 10 In this embodiment, a linear guide rod is fixedly connected between the two extension seats 40, and the displacement frame 42 is also slidably connected to the linear guide rod; More specifically, by setting up linear guide rods, the displacement of displacement frame 42 can be effectively guided, avoiding uncontrollable displacement of displacement frame 42 and greatly ensuring the stability of displacement frame 42 during displacement. Please refer to Figure 8 In some embodiments, the flow control component includes: The flow control shaft 44 is rotatably connected to one side of the recovery pipe B34. A sealing plate 45 is fixedly connected to one end of the flow control shaft 44 inside the recovery pipe B34, and an adjusting plate 46 is fixedly connected to the other end of the flow control shaft 44 outside the recovery pipe B34. A through groove B47 is opened in the middle of the adjusting plate 46. Push rod 48 is fixedly connected to the top of one side of displacement frame 42, and one end of push rod 48 is also movably connected to the inside of through groove B47; Please refer to Figure 8 In some embodiments, a sealing groove is provided on the outer side of the sealing piece 45, and a sealing ring is fixedly connected inside the sealing groove; More specifically, the sealing ring is mounted on the sealing groove. When the sealing plate 45 seals the recovery pipe B34, the elastic deformation of the sealing ring can be used to seal the gap between the recovery pipe B34 and the sealing plate 45, preventing liquid in the dust collection box 19 from flowing out from the gap. Furthermore, the sealing ring can be made of rubber or silicone.
[0026] Working principle: First, connect the melamine tail gas transmission pipeline to the tail gas transmission pipe 10, and then connect the lime kiln gas transmission pipeline to the gas inlet pipe. When the melamine tail gas travels along the inside of the tail gas transmission pipe 10, the heat in the tail gas will directly exchange heat with the liquid inside the cooling tank 9, thereby reducing the tail gas temperature. Simultaneously, the transfer pump B12 is started to draw the heat exchange liquid inside the cooling tank 9 out through the external inlet pipe B13 and inject it into the heat exchange tube 17 through the transfer pipe B14. As the heat exchange liquid flows inside the heat exchange tube 17, the temperature of the heat exchange liquid will be introduced into the spray water inside the liquid storage tank 16. This preheats the spray water and cools the heat exchange liquid. After cooling, the heat exchange liquid finally returns to the cooling tank 9 through the return pipe 15, thus realizing the circulation of the heat exchange liquid. After cooling, the exhaust gas will be injected into the interior of the absorption tower 2 through the transfer pipe B11, and will be made into concentrated ammonia water by countercurrent contact with water or circulating absorbent. The concentrated ammonia water will be drawn out through the external inlet pipe A5 by the transfer pump A4 and injected into the carbonization tower 3 through the transfer pipe A6 to wait for reaction. The transfer pump C22 is started to draw out the liquid inside the transfer pipe C24 and inject it into the spray pipe 21 through the external inlet pipe C23. Finally, it is sprayed out through the spray pipe 21. As the lime kiln gas rises inside the dust settling box 19, the dust in the lime kiln gas will come into contact with the water mist and the water mist will adsorb the dust in the lime kiln gas. The sprayed liquid will be concentrated at the bottom of the dust settling box 19 and flow into the assembly cylinder 31 through the recovery pipe B34 so that the impurities in the liquid can be intercepted by the filter plate 32. After being treated by the filter plate 32, the liquid will finally return to the storage tank 16 through the recovery pipe A33, thus realizing the circulation of the liquid. The lime kiln gas after spray adsorption will be discharged through the transfer pipe C26 and sent into the interior of the electrostatic precipitator 27 to remove dust from the airflow again. The dust-removed airflow will be pressurized by the air compressor 29 and sent into the interior of the carbonization tower 3 to react with concentrated ammonia water in a bubbling reaction to balance ammonia and carbon dioxide for subsequent preparation of ammonium bicarbonate. When the filter plate 32 is saturated, rotating the transmission screw 41, in conjunction with the connection between the transmission screw 41 and the displacement frame 42, will cause the displacement frame 42 to adjust along the transmission screw 41. Since the guide rod 43 is connected inside the through groove A39, as the guide rod 43 follows the adjustment of the displacement frame 42, the adjustment of the guide rod 43 inside the through groove A39 will drive the rotating shaft 36 to rotate, causing the moving clamp 37 to move away from the fixed clamp 35, thereby releasing the positioning of the assembly cylinder 31. At the same time, since the push rod 48 is connected inside the through groove B47, during the displacement of the displacement frame 42, the adaptive adjustment of the push rod 48 inside the through groove B47 will drive the sealing plate 45 to gradually seal the recovery pipe B34. After the sealing plate 45 completely seals the recovery pipe B34, the assembly cylinder 31 can be removed from between the recovery pipe A33 and the recovery pipe B34, and the assembly cylinder 31 can be replaced.
[0027] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of protection of the claims of the present invention.
Claims
1. A melamine tail gas treatment device, characterized in that, include: A substrate (1) is fixedly connected to an absorption tower (2) and a carbonization tower (3) at its top. A transfer pump A (4) is fixedly connected to the outside of the absorption tower (2). An external lead pipe A (5) is fixedly connected to the output end of the transfer pump A (4). The end of the external lead pipe A (5) away from the transfer pump A (4) is connected to the absorption tower (2). A transfer pipe A (6) is fixedly connected to the output end of the transfer pump A (4). The end of the transfer pipe A (6) away from the transfer pump A (4) is also connected to the liquid inlet end of the carbonization tower (3). Cooling component (7), the cooling component (7) is mounted on the top of the substrate (1), the cooling component (7) is used to work with the absorption tower (2) to adsorb ammonia in melamine tail gas; Neutralization component (8), which is mounted on the top of substrate (1), is used to balance ammonia and carbon dioxide and to prepare ammonium bicarbonate in conjunction with carbonization tower (3).
2. The melamine tail gas treatment equipment according to claim 1, characterized in that, The cooling component (7) includes: Cooling tank (9), the cooling tank (9) is fixedly connected to the top of the base plate (1), the interior of the cooling tank (9) is fixedly connected to the exhaust gas transmission pipe (10), the bottom end of the exhaust gas transmission pipe (10) is fixedly connected to the transmission pipe B (11), and the end of the transmission pipe B (11) away from the cooling tank (9) is connected to the air inlet pipe of the absorption tower (2). Transfer pump B (12) is fixedly connected to the outside of cooling tank (9). The input end of transfer pump B (12) is fixedly connected to external lead pipe B (13), and the end of external lead pipe B (13) away from transfer pump B (12) is also connected to cooling tank (9). The output end of transfer pump B (12) is fixedly connected to transfer pipe B (14), and the top of the outside of cooling tank (9) is fixedly connected to return pipe (15).
3. The melamine tail gas treatment equipment according to claim 2, characterized in that, The neutralizing component (8) includes: The liquid storage tank (16) is fixedly connected to the top of the base plate (1). The bottom of the liquid storage tank (16) is fixedly connected to a heat exchange tube (17). The end of the transmission tube B (14) away from the transmission pump B (12) is fixedly connected to the end of the heat exchange tube (17), and the other end of the heat exchange tube (17) is connected to the return pipe (15). Two upright plates (18) are fixedly connected to the top of the liquid storage tank (16), and a dust settling box (19) is fixedly connected between the tops of the two upright plates (18). A spray assembly is installed between a dust settling box (19) and a liquid storage tank (16), and the spray assembly is used to absorb dust in lime kiln gas. A recovery assembly (25) is assembled between a dust settling box (19) and a liquid storage tank (16) for recovering the liquid sprayed by the spray assembly; The transfer pipe C (26) is fixedly connected to the top of the dust settling box (19). The top of the base plate (1) is fixedly connected to the electrostatic precipitator (27) and the air compressor (29). The end of the transfer pipe C (26) away from the dust settling box (19) is connected to the air inlet of the electrostatic precipitator (27). The air outlet of the electrostatic precipitator (27) is fixedly connected to the air supply pipe A (28). The end of the air supply pipe A (28) away from the electrostatic precipitator (27) is fixedly connected to the input of the air compressor (29). The output of the air compressor (29) is fixedly connected to the air supply pipe B (30). The end of the air supply pipe B (30) away from the air compressor (29) is connected to the air inlet of the carbonization tower (3).
4. The melamine tail gas treatment equipment according to claim 3, characterized in that, The spray assembly includes: Spray pipe (21), the spray pipe (21) is fixedly connected to the top of the dust settling box (19), and multiple air distribution plates (20) are fixedly connected to the inside of the dust settling box (19) at an incline to extend the flow path of lime kiln gas. A transfer pump C (22) is fixedly connected to the outside of the dust settling box (19). An external lead pipe C (23) is fixedly connected to the output end of the transfer pump C (22). The end of the external lead pipe C (23) away from the transfer pump C (22) is also fixedly connected to the spray pipe (21). A transfer pipe C (24) is fixedly connected to the input end of the transfer pump C (22), and the end of the transfer pipe C (24) away from the transfer pump C (22) is also connected to the liquid storage tank (16).
5. The melamine tail gas treatment equipment according to claim 3, characterized in that, The recycling component (25) includes: Assembly cylinder (31), with multiple filter plates (32) fixedly connected inside the assembly cylinder (31), recovery pipe A (33) fixedly connected to the top of the liquid storage tank (16), recovery pipe B (34) fixedly connected to the bottom of the dust settling box (19), and the assembly cylinder (31) is located between recovery pipe A (33) and recovery pipe B (34). Two fixed clamping plates (35) are fixedly connected to the ends of the recovery pipe B (34) and the recovery pipe A (33) respectively. A rotating shaft (36) is rotatably connected to one end of the fixed clamping plate (35). A movable clamping plate (37) is fixedly connected to the rotating shaft (36). An eccentric plate (38) is fixedly connected to the top of the rotating shaft (36). A through groove A (39) is opened in the middle of the eccentric plate (38). Two extension seats (40) are fixedly connected to both sides of one of the upright plates (18). A transmission screw (41) is rotatably connected between the two extension seats (40). A displacement frame (42) is threaded onto the transmission screw (41). A guide rod (43) is fixedly connected to the top and bottom of the displacement frame (42). The two guide rods (43) are movably connected to the inside of two through slots A (39). A flow control assembly for limiting the flow of liquid at the recovery tube B (34).
6. The melamine tail gas treatment equipment according to claim 5, characterized in that, The flow control component includes: A flow control shaft (44) is rotatably connected to one side of the recovery pipe B (34). A sealing plate (45) is fixedly connected to one end of the flow control shaft (44) inside the recovery pipe B (34), and an adjusting plate (46) is fixedly connected to one end of the flow control shaft (44) outside the recovery pipe B (34). A through groove B (47) is opened in the middle of the adjusting plate (46). Push rod (48) is fixedly connected to the top of one side of displacement frame (42), and one end of push rod (48) is also movably connected to the inside of through groove B (47).
7. The melamine tail gas treatment equipment according to claim 2, characterized in that, The exhaust gas transmission pipe (10) is spiral-shaped, and the top of the exhaust gas transmission pipe (10) extends to the outside of the cooling tank (9).
8. The melamine tail gas treatment equipment according to claim 4, characterized in that, The bottom end of the spray pipe (21) is provided with multiple spray holes, and each spray hole is fixedly connected to an atomizing nozzle.
9. The melamine tail gas treatment equipment according to claim 5, characterized in that, Both the fixed clamping plate (35) and the movable clamping plate (37) are arc-shaped, and both the fixed clamping plate (35) and the movable clamping plate (37) are fixedly connected with anti-slip pads, and the anti-slip pads are provided with anti-slip patterns.
10. A melamine tail gas treatment device according to claim 6, characterized in that, The sealing plate (45) has a sealing groove on its outer side, and a sealing ring is fixedly connected inside the sealing groove.