Pretreatment device for recycled asphalt mixture flue gas

Abstract

The utility model discloses a pretreatment device for recycled asphalt mixture flue gas, which relates to the technical field of waste gas treatment and comprises a dry filter box, a cooling tower, an alkaline tower, a water washing tower, a demisting tower and an air feeder, a plurality of mounting grooves are formed in the top of the dry filter box, filter frames are arranged in the mounting grooves, and the filter frames are arranged in the mounting grooves. The device has the beneficial effects that by adopting a pretreatment method of water washing, alkali washing, demisting and dry filtering, the working condition that flue gas enters the concentration device is met, after waste gas is collected, the waste gas is subjected to water washing cooling, alkali washing and water washing, and the concentration effect of the flue gas is improved. The waste gas is demisted through the dry-type filter tank to remove most of asphalt fume, macromolecular substances, acidic substances, particulate matters and the like in the waste gas, and the residual asphalt fume and macromolecular substances in the waste gas are further removed through multi-stage filtration in the dry-type filter tank after demisting, so that the condition that the waste gas enters the zeolite rotating wheel is met.

Description

A pretreatment device for flue gas from recycled asphalt mixtures Technical Field

[0001] This utility model relates to the field of waste gas treatment technology, specifically a pretreatment device for flue gas from recycled asphalt mixtures. Background Technology

[0002] With the rapid development of infrastructure construction in China, recycling and reusing asphalt mixtures from old road surfaces has become an important direction for the circular economy in order to make more effective use of resources. However, the asphalt mixture recycling process generates a large amount of asphalt fumes, which, if not effectively treated, will cause serious air pollution and odor nuisance. Because asphalt fumes have a low concentration of organic matter and contain heavy components with high boiling points and large molecular sizes, such as asphalt fumes and benzo[a]pyrene, as well as some particulate matter, directly using concentration and incineration technologies for end-of-pipe treatment will lead to systemic problems such as poisoning and blockage of end-of-pipe treatment equipment, making long-term stable operation difficult.

[0003] The current method of removing high-boiling-point substances from the flue gas of recycled asphalt mixtures mainly uses electrostatic precipitation technology, which has safety hazards and is difficult to guarantee continuous operation, making it unsuitable for this working condition. Therefore, we propose a pretreatment device for the flue gas of recycled asphalt mixtures. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a pretreatment device for flue gas from recycled asphalt mixtures, which solves the problems mentioned in the background section.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a pretreatment device for flue gas from recycled asphalt mixtures, comprising a dry filter box, a cooling tower, an alkali washing tower, a water washing tower, a demisting tower, and a blower. The top of the dry filter box has several mounting slots, each containing a filter frame. Limiting guide plates are fixedly installed at the top and bottom of the dry filter box, and the filter frames cooperate with the limiting guide plates. A sealing top plate is fixedly installed on the top of the filter frames. A drive box is fixedly installed on one side of the top of the dry filter box. A sliding groove is provided inside the drive box. A motor is fixedly installed on one side of the drive box. A bidirectional multi-threaded screw is fixedly installed inside the sliding groove at the output end of the motor. Several sleeve blocks are threaded onto the outer side of the bidirectional multi-threaded screw. A fixing pressure plate is fixedly installed on one side of each sleeve block, and the fixing pressure plate cooperates with the sealing top plate.

[0006] Preferably, handle grooves are provided inside both sides of the sealing top plate, and filter elements are provided inside the several filter frames.

[0007] Preferably, a guide box is fixedly installed on the other side of the top of the dry filter box. The guide box has a guide groove inside, and a guide rod is fixedly installed inside the guide groove. A slider is fixedly installed on one side of the fixed pressure plate, and the slider is slidably connected to the guide rod.

[0008] Preferably, an air inlet pipe is provided on one side of the dry filter box, the output end of the blower is fixedly connected to one end of the air inlet pipe, and an air outlet pipe is provided on the other side of the dry filter box.

[0009] Preferably, the sleeve has a hole inside that mates with a bidirectional multi-threaded screw, and the bidirectional multi-threaded screw is slidably connected to the inner wall of the groove.

[0010] Preferably, the slider has a hole inside that mates with the guide rod.

[0011] This utility model provides a pretreatment device for flue gas from recycled asphalt mixtures, which has the following beneficial effects:

[0012] 1. The pretreatment device for the flue gas of the recycled asphalt mixture adopts a pretreatment method of "water washing + alkali washing + demisting + dry filtration" to meet the operating conditions for the flue gas to enter the concentration device. After collection, the waste gas is cooled by water washing, alkali washing, and water washing to remove most of the asphalt fumes, macromolecules, acidic substances, and particulate matter in the waste gas. After demisting, it is filtered through multiple stages in the dry filter box to further remove the residual asphalt fumes and macromolecules in the waste gas, thus meeting the conditions for entering the zeolite rotor.

[0013] 2. The pretreatment device for flue gas from recycled asphalt mixtures, through the installation of a trough, filter frames, a sealed top plate, a drive box, a motor, a two-way multi-threaded screw, a sleeve block, and a fixed pressure plate, facilitates the disassembly, cleaning, and replacement of several filter frames, thus improving ease of use. Attached Figure Description

[0014] Figure 1 is a schematic diagram of the structure of this utility model;

[0015] Figure 2 is a schematic diagram of the filter box structure of this utility model;

[0016] Figure 3 is a rear view of the filter box of this utility model;

[0017] Figure 4 is a cross-sectional view of the filter box of this utility model;

[0018] Figure 5 is an enlarged view of point A in Figure 4 of this utility model;

[0019] Figure 6 is a schematic diagram of the filter frame of this utility model;

[0020] Figure 7 is a schematic diagram of the structure of the bidirectional multi-threaded lead screw of this utility model.

[0021] In the diagram: 1. Dry filter box; 2. Cooling tower; 3. Alkali washing tower; 4. Water washing tower; 5. Demisting tower; 6. Blower; 7. Mounting slot; 8. Filter frame; 9. Limiting guide plate; 10. Sealing top plate; 11. Drive box; 12. Slide groove; 13. Motor; 14. Two-way multi-threaded screw; 15. Sleeve block; 16. Fixed pressure plate; 17. Filter element; 18. Handle groove; 19. Guide box; 20. Guide groove; 21. Guide rod; 22. Slider; 23. Inlet pipe; 24. Outlet pipe. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0023] Please refer to Figures 1 to 6. This utility model provides a technical solution: a pretreatment device for flue gas from recycled asphalt mixtures, including a dry filter box 1, a cooling tower 2, an alkali washing tower 3, a water washing tower 4, a demisting tower 5, and a blower 6. The top of the dry filter box 1 has several mounting slots 7, each containing a filter frame 8. Limiting guide plates 9 are fixedly installed at the top and bottom of the dry filter box 1, cooperating with the limiting guide plates 9. A sealing top plate 10 is fixedly installed on the top of the filter frame 8. Handle slots 18 are provided on both sides of the sealing top plate 10. Filter elements 17 are installed inside each of the filter frames 8. A drive mechanism is fixedly installed on one side of the top of the dry filter box 1. The drive box 11 has a sliding groove 12 inside. A motor 13 is fixedly installed on one side of the drive box 11. The output end of the motor 13 extends into the sliding groove 12 and a bidirectional multi-threaded screw 14 is fixedly installed inside. The bidirectional multi-threaded screw 14 is made by a central rod and multiple bidirectional screws fixedly connected on the central rod. The motor 13 is fixedly connected to the central rod. Several sleeve blocks 15 are threaded on the outer side of the bidirectional multi-threaded screw 14. The sleeve blocks 15 have holes that mate with the bidirectional multi-threaded screw 14 inside. The bidirectional multi-threaded screw 14 is slidably connected to the inner wall of the sliding groove 12. A fixing pressure plate 16 is fixedly installed on one side of the sleeve block 15. The fixing pressure plate 16 mates with the sealing top plate 10.

[0024] The cooling tower 2 is used to agglomerate particulate matter and macromolecular particles with a diameter between 0.1 and 10 μm in the asphalt flue gas into particles with a diameter greater than 1 μm through primary water washing and cooling. The alkaline washing tower 3 is used to perform alkaline washing on the flue gas, and there can be two or more alkaline washing towers 3. The water washing tower 4 is used to remove alkaline substances entrained in the exhaust gas. The demisting tower 5 is used to remove moisture entrained in the exhaust gas after water washing and alkaline washing, creating conditions for entering the dry filter box 1.

[0025] The dry filter box 1 contains several filter frames 8 and filter elements 17, which are composed of a five-stage filtration structure consisting of G4, F7, activated carbon, F9, and Y10. G4 is made of fracture-resistant glass fiber filter material with a gradually increasing fiber structure, an average capture rate of over 95%, and a temperature resistance of 80℃. Its function is to remove large-diameter particles remaining in the exhaust gas. The high-efficiency filter media of F7, F9, and Y10 are non-woven fabrics composed of organic synthetic fibers and microfibers, with a gradually increasing fiber structure, an average capture efficiency of over 99%, and a temperature resistance of 90℃. The activated carbon layer is used to adsorb organic molecules remaining after water washing and alkali washing.

[0026] The cooling tower 2 is equipped with an exhaust gas inlet pipe at its input end. The output ends of the cooling tower 2, alkaline washing tower 3, water washing tower 4, and demister 5 are all equipped with connecting pipes. One end of the connecting pipe at the top of the cooling tower 2 is connected to the input end of the alkaline washing tower 3. One end of the connecting pipe at the top of the alkaline washing tower 3 is connected to the input end of the water washing tower 4. One end of the connecting pipe at the top of the water washing tower 4 is connected to the input end of the demister 5. One end of the connecting pipe at the top of the demister 5 is connected to the input end of the blower 6.

[0027] A guide box 19 is fixedly installed on the other side of the top of the dry filter box 1. A guide groove 20 is opened inside the guide box 19. A guide rod 21 is fixedly installed inside the guide groove 20. A slider 22 is fixedly installed on one side of the fixed pressure plate 16. The slider 22 is slidably connected to the guide rod 21. A hole that mates with the guide rod 21 is opened inside the slider 22. The function of the guide box 19, guide groove 20, guide rod 21 and slider 22 is to limit and guide the fixed pressure plate 16.

[0028] An air inlet pipe 23 is provided on one side of the dry filter box 1, and the output end of the blower 6 is fixedly connected to one end of the air inlet pipe 23. An air outlet pipe 24 is provided on the other side of the dry filter box 1.

[0029] In summary, the pretreatment device for the flue gas of recycled asphalt mixture, during use, allows the flue gas generated during the production of recycled asphalt mixture to enter the cooling tower 2 through the exhaust gas inlet pipe for water washing and cooling, then sequentially enter the alkali washing tower 3 for alkali washing, followed by water washing in the water washing tower 4, and then pass through the demister tower 5 to remove moisture from the exhaust gas before being fed into the dry filter box 1 by the blower 6. Subsequently, several filter frames 8 and filter elements 17 in the cooling tower 2 are used for filtration. The filtered exhaust gas is output through the exhaust pipe 24 for further treatment. When the filter elements 17 in the dry filter box 1 need to be replaced after a long period of filtration, it is only necessary to turn on the motor 13. The motor 13 drives the bidirectional multi-threaded screw 14 to rotate. The bidirectional multi-threaded screw 14 drives several sleeve blocks 15 through the threads, which in turn moves the fixed pressure plate 16 to both sides of the sealing top plate 10, thereby releasing the restriction on the sealing top plate 10. Then, the sealing top plate 10 and filter frames 8 can be pulled out from the mounting groove 7 for cleaning and replacement. Disassembly and replacement are convenient and quick.

[0030] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A pretreatment device for flue gas from recycled asphalt mixtures, comprising a dry filter box (1), a cooling tower (2), an alkali washing tower (3), a water washing tower (4), a demister (5), and a blower (6), characterized in that: The dry filter box (1) has several mounting slots (7) inside its top. Each of the mounting slots (7) has a filter frame (8). The top and bottom of the dry filter box (1) are fixedly installed with limit guide plates (9). The filter frame (8) cooperates with the limit guide plate (9). The top of the filter frame (8) is fixedly installed with a sealing top plate (10). A drive box (11) is fixedly installed on one side of the top of the dry filter box (1). The drive box (11) has a sliding groove (12) inside its interior. A motor (13) is fixedly installed on one side of the drive box (11). The output end of the motor (13) extends into the sliding groove (12) and is fixedly installed with a bidirectional multi-threaded screw (14). Several sleeve blocks (15) are threaded on the outer side of the bidirectional multi-threaded screw (14). A fixing pressure plate (16) is fixedly installed on one side of the sleeve block (15). The fixing pressure plate (16) cooperates with the sealing top plate (10).

2. The pretreatment device for flue gas from recycled asphalt mixtures according to claim 1, characterized in that: Handle grooves (18) are provided inside both sides of the sealing top plate (10), and filter elements (17) are provided inside several filter frames (8).

3. The pretreatment device for flue gas from recycled asphalt mixtures according to claim 1, characterized in that: A guide box (19) is fixedly installed on the other side of the top of the dry filter box (1). A guide groove (20) is opened inside the guide box (19). A guide rod (21) is fixedly installed inside the guide groove (20). A slider (22) is fixedly installed on one side of the fixed pressure plate (16). The slider (22) is slidably connected to the guide rod (21).

4. The pretreatment device for flue gas from recycled asphalt mixtures according to claim 1, characterized in that: An air inlet pipe (23) is provided on one side of the dry filter box (1), and the output end of the blower (6) is fixedly connected to one end of the air inlet pipe (23). An air outlet pipe (24) is provided on the other side of the dry filter box (1).

5. The pretreatment device for flue gas from recycled asphalt mixture according to claim 1, characterized in that: The sleeve (15) has a hole inside that mates with the bidirectional multi-threaded screw (14), and the bidirectional multi-threaded screw (14) is slidably connected to the inner wall of the slide groove (12).

6. The pretreatment device for flue gas from recycled asphalt mixture according to claim 3, characterized in that: The slider (22) has a hole inside that mates with the guide rod (21).

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