Dry-wet separation type exhaust gas and dust collaborative purification system and method for plate production line

Abstract

The application discloses a dry-wet shunt type waste gas and dust collaborative purification system and method for a plate production line, and relates to the technical field of waste gas treatment. The dry-wet shunt type waste gas and dust collaborative purification system for the plate production line comprises a cyclone separator for treating dry waste gas, a condensation demister for treating wet waste gas, a washing tower and a wire mesh dehumidifier arranged in sequence downstream of the condensation demister, and gases discharged from the cyclone separator and the wire mesh dehumidifier enter a bag-type dust collector for collaborative treatment. A cylindrical wire mesh dehumidifier body is rotatably installed in an outer shell. The dry-wet shunt type waste gas and dust collaborative purification system and method for the plate production line adopts an overall framework of dry-wet shunt treatment. Dry dust and wet waste gas are treated along respective paths to a clean and dry state, and then converge at the end into the bag-type dust collector for collaborative treatment, thereby avoiding the problem of filter bag sticking and clogging caused by the mixing of water vapor carried by the wet waste gas and the dry dust.

Description

Technical Field

[0001] This invention relates to the field of waste gas treatment technology, specifically to a dry-wet separation type waste gas and dust co-purification system and method for use in board production lines. Background Technology

[0002] In cement board (such as autoclaved cement slabs) production lines, the nature of pollutants generated at different work stations varies considerably. Machining processes, such as cutting and trimming, mainly generate dry dust; while wet processes, such as autoclave curing, mainly discharge wet waste gas (steam mist aerosol) containing a large amount of water vapor, suspended fine dust, and soluble components.

[0003] In existing technologies, the exhaust gases generated at each workstation on the production line are usually collected and sent to the same end-of-line dust collection equipment (such as a bag filter) for centralized treatment. However, once the large amount of water vapor carried in the wet exhaust gas mixes with dry dust and enters the bag filter, it easily causes the dust to become damp and stick to the surface of the filter bags, resulting in filter bag clogging and a sharp increase in filtration resistance. This not only reduces the overall dust removal efficiency but also significantly shortens the service life of the filter bags and significantly increases the operating and maintenance costs of the equipment.

[0004] In addition, existing devices for dehumidifying and demisting wet exhaust gases mostly adopt a fixed plate-type wire mesh structure. When the exhaust gas flows through the plate-type wire mesh, water vapor gathers on the surface of the wire mesh and forms a continuous water film. As the operating time increases, the water film gradually thickens. When the airflow passes through the surface of the water film, it is easy to re-encapsulate some of the moisture, forming a secondary carry-over phenomenon, which leads to unstable dehumidification effect and incomplete dehydration of wet exhaust gas. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a dry-wet separation type exhaust gas and dust co-purification system and method for board production lines. It solves the problems of filter bag clogging and the tendency of airflow to re-entrain and carry away some moisture when passing over the water film surface, resulting in a secondary carryover phenomenon, which leads to unstable dehumidification effect and incomplete dehydration of wet exhaust gas.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution: a dry and wet separation type exhaust gas and dust co-purification system for a board production line, including a cyclone separator for treating dry exhaust gas and a condenser demister for treating wet exhaust gas. Downstream of the condenser demister, a scrubbing tower and a wire mesh dehumidifier are arranged in sequence. The gas discharged from the cyclone separator and the wire mesh dehumidifier enters the bag filter for co-treatment.

[0007] The wire mesh dehumidifier includes:

[0008] The outer casing is installed at the top of the scrubbing tower;

[0009] A tubular wire mesh dewatering body is rotatably installed inside a housing;

[0010] A flexible water-absorbing cylinder structure is located outside the cylindrical wire mesh water removal body and is fixedly connected to the cylindrical wire mesh water removal body through a connecting component. An air intake space is formed between the flexible water-absorbing cylinder structure and the cylindrical wire mesh water removal body. Gas enters the cylindrical wire mesh water removal body through the air intake space and is discharged through the exhaust pipe at the upper end of the cylindrical wire mesh water removal body. A sandwich is formed between the flexible water-absorbing cylinder structure and the outer shell. The exhaust pipe of the cylindrical wire mesh water removal body is equipped with an exhaust fan.

[0011] The driving mechanism, located above the outer shell, is used to drive the cylindrical wire mesh dewatering body to rotate, causing the water on the cylindrical wire mesh dewatering body to be thrown into the flexible water suction cylinder structure by centrifugal force. The flexible water suction cylinder structure rotates with the cylindrical wire mesh dewatering body, and the water on the flexible water suction cylinder structure is thrown onto the inner wall of the outer shell by centrifugal force. The splashed liquid is located in the interlayer and does not come into contact with the airflow in the air intake space.

[0012] Furthermore, a drain pipe is installed on one side of the interlayer, and the lower end of the drain pipe is fixedly connected to the upper end of the washing tower.

[0013] Furthermore, a top seat is fixed to the upper part of the inner shell, and a support base is fixed to the lower part of the inner shell. A hollow part is provided on the area of ​​the support base opposite to the air intake space. The exhaust gas treated by the scrubbing tower enters the air intake space through the hollow part.

[0014] Furthermore, the tubular wire mesh dewatering body includes a tubular wire mesh, with an inner frame inside the tubular wire mesh and an outer frame outside the tubular wire mesh. The upper end of the tubular wire mesh is provided with a second end seal, and the lower end is provided with a first end seal. The cross-section of the second end seal is T-shaped. The second end seal is embedded in the top seat and a bearing is provided between the second end seal and the top seat. The first end seal is supported on the support base.

[0015] Furthermore, the lower end of the exhaust pipe is fixedly connected to the second end, and the upper end of the exhaust pipe passes through the top surface of the outer shell. The driving mechanism drives the exhaust pipe to rotate, thereby causing the cylindrical wire mesh dewatering body to rotate.

[0016] Furthermore, the flexible water-absorbing cylinder structure includes a flexible cylinder body and a locking bolt. The outer periphery of the flexible cylinder body is provided with first longitudinal ribs at equal intervals along the circumferential direction, and the outer periphery of the flexible cylinder body is provided with first annular ribs at equal intervals along the axial direction. The locking bolt extends from the inner surface of the flexible cylinder body to the outer surface of the flexible cylinder body and is located at the intersection of the first longitudinal rib and the first annular rib. A nut is provided on the locking bolt at the intersection.

[0017] Furthermore, the drive mechanism includes a first bevel gear fixed to the exhaust pipe, a second bevel gear meshing with one side of the first bevel gear, and a motor for driving the second bevel gear.

[0018] Furthermore, the flexible cylinder body is provided with a non-woven fabric layer, a large pore layer and a fine pore layer from the inside out.

[0019] Furthermore, end seats are fixed at both the upper and lower ends of the flexible cylinder body, and the first longitudinal rib is welded to the end seats.

[0020] On the other hand, the present invention also provides a method for the co-purification of dry and wet separated exhaust gas and dust for a board production line, applicable to the aforementioned co-purification system for dry and wet separated exhaust gas and dust for a board production line, characterized by comprising the following steps:

[0021] Dry exhaust gas enters a cyclone separator for processing, and the exhaust gas after being processed by the cyclone separator directly enters a bag filter.

[0022] The wet exhaust gas is treated by a condenser demister, a scrubbing tower and a wire mesh dehumidifier, and the treated exhaust gas enters a bag filter dust collector.

[0023] In the dehumidifier, the water enters from the outside of the cylindrical wire mesh dehumidifier body during dehumidification and is discharged. The rotating cylindrical wire mesh dehumidifier body can throw the wastewater toward the flexible suction cylinder structure and be absorbed by the flexible suction cylinder structure. When the flexible suction cylinder structure rotates, it can throw the wastewater onto the inner wall of the outer shell.

[0024] The present invention has the following beneficial effects:

[0025] (1) The dry and wet separation type exhaust gas and dust co-purification system and method for board production line adopts the overall architecture of dry and wet separation treatment. Dry dust and wet exhaust gas are treated to a clean and dry state along their respective paths and then merge at the end to enter the bag filter for co-treatment. This avoids the problem of filter bag clogging caused by the mixing of water vapor carried by wet exhaust gas with dry dust, improves the operation stability of bag filter and extends the service life of filter bag.

[0026] (2) The dry and wet separation exhaust gas and dust co-purification system and method for board production line design the wire mesh dehumidifier into a cylindrical structure that can be actively rotated. It uses centrifugal force to continuously throw off the water attached to the surface of the wire mesh, avoiding the secondary carry-over problem caused by the accumulation of water film on the surface of the traditional fixed board wire mesh, and the dehumidification effect is more stable and thorough.

[0027] (3) The dry and wet separation type exhaust gas and dust co-purification system and method for board production line is provided with a flexible water suction cylinder structure that rotates synchronously with the outside of the cylindrical wire mesh water removal body. Through the double centrifugal water throwing method, the flexible water suction cylinder structure first receives the water thrown out by the cylindrical wire mesh water removal body, and then throws the water to the interlayer area of ​​the inner wall of the outer shell by its own rotation, so that the splashed liquid is always confined in the interlayer and does not enter the air intake space, thus avoiding the problem of water splashing back and being carried by the airflow.

[0028] (4) The dry and wet separation type exhaust gas and dust co-purification system and method for board production line, under the premise of ensuring the normal water absorption and drainage function of the flexible water suction cylinder structure, effectively prevents wet exhaust gas from penetrating the flexible water suction cylinder structure and entering the interlayer without treatment, ensuring that all exhaust gas is dehumidified by the cylindrical wire mesh water removal body; at the same time, with the high pressure backwash pipe set in the interlayer, the dust and dirt layer attached to the surface of the flexible cylinder body can be removed regularly, extending its service life.

[0029] (5) The dry and wet separation type exhaust gas and dust co-purification system and method for board production line is equipped with a lifting frame, lifting screw and replacement platform, etc., so that the flexible water suction cylinder structure can be lifted and exposed as a whole for quick replacement. With the detachable design of the connecting components, the equipment maintenance convenience is greatly improved and the downtime maintenance cost is reduced.

[0030] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0031] Figure 1 This is a process flow diagram of the present invention;

[0032] Figure 2 This is an assembly diagram of the washing tower, wire mesh dehumidifier, and mechanism for replacing the flexible water suction cylinder structure of the present invention;

[0033] Figure 3 For the present invention Figure 2 A structural diagram showing the system without the replacement platform installed.

[0034] Figure 4 For the present invention Figure 3 The main view;

[0035] Figure 5 This is an assembly diagram of the washing tower and wire mesh dehumidifier of the present invention;

[0036] Figure 6 This is a cross-sectional view of the outer casing of the present invention;

[0037] Figure 7 For the present invention Figure 6 A partial view;

[0038] Figure 8 This is a schematic diagram of the internal structure of the outer casing of the present invention;

[0039] Figure 9 This is a cross-sectional view of the tubular wire mesh dewatering body of the present invention;

[0040] Figure 10 This is an exploded view of the flexible water-absorbing cylinder structure of the present invention.

[0041] In the diagram, 1. Condenser demister; 2. Scrubber tower; 3. Wire mesh dehumidifier; 31. Outer shell; 311. Upper shell; 312. Lower shell; 32. Flexible water suction cylinder structure; 321. First longitudinal rib; 322. First annular rib; 323. Locking bolt; 324. End seat; 325. Flexible cylinder body; 3251. Non-woven fabric layer; 3252. Large pore layer; 3253. Fine pore layer; 33. Support base; 331. Hollowed-out section; 34. Top seat; 35. Tubular wire mesh dehumidifier body; 351. Tubular wire mesh 352. Outer frame; 353. Inner frame; 354. First end seal; 355. Second end seal; 36. Exhaust pipe; 37. Drive mechanism; 371. First bevel gear; 372. Second bevel gear; 373. Motor; 38. Drain pipe; 39. Connecting assembly; 391. First connecting rod; 392. Second connecting rod; 310. High-pressure backwash pipe; 4. Cyclone separator; 5. Bag filter; 6. Changing platform; 7. Lifting screw; 8. Lifting frame; 9. Stroke nut; 10. Exhaust fan. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] In the description of this invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around", etc., which indicate orientation or positional relationship, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0044] The following is based on Figures 1-10 This invention describes a dry-wet separation type exhaust gas and dust co-purification system and method for a sheet metal production line, provided by an embodiment of the present invention.

[0045] Please see Figure 1The present invention provides a technical solution: a dry and wet separation type exhaust gas and dust co-purification system for a board production line, including two independent treatment paths, a dry path and a wet path, and the two gas paths merge at the end and enter the bag filter 5 for co-processing.

[0046] The main line is used to treat dry dust exhaust gas generated in the board production line, such as the cutting machine and the edge grinding machine. After the dry exhaust gas generated in the above-mentioned workstations is collected by the closed collection hood, it first enters the cyclone separator 4. The centrifugal separation effect is used to remove the larger dust particles in the exhaust gas. Then the exhaust gas directly enters the bag filter 5, where the filter bags further capture the fine dust particles before it is discharged in compliance with the standards.

[0047] The wet circuit is used to treat wet waste gas generated in the board production line, such as the autoclave. The high-temperature and high-humidity waste gas discharged from the autoclave first enters the condenser demister 1, where some of the water vapor in the waste gas is condensed and removed by cooling and settling. The waste gas, after preliminary dehumidification, then enters the scrubbing tower 2, where residual suspended fine dust and soluble components in the waste gas are further absorbed by spraying scrubbing liquid, while the waste gas is cooled and humidified for balancing. The wet waste gas after being treated by the scrubbing tower 2 finally enters the wire mesh dehumidifier 3, where the residual moisture in the waste gas is further removed to the level that meets the humidity requirements of the inlet of the bag filter 5, so as to avoid the filter bags becoming damp and clogged after the waste gas with moisture enters the bag filter 5.

[0048] Combination Figures 2-7 As shown, the wire mesh dehumidifier 3 includes a shell 31, a cylindrical wire mesh dewatering body 35, a flexible water suction cylinder structure 32, and a drive mechanism 37.

[0049] The outer shell 31 is installed at the upper end of the scrubbing tower 2, and the cylindrical wire mesh dewatering body 35 is rotatably installed inside the outer shell 31. The flexible water suction cylinder structure 32 is located outside the cylindrical wire mesh dewatering body 35 and is fixedly connected to the cylindrical wire mesh dewatering body 35 through the connecting component 39, thereby forming an integral unit between the cylindrical wire mesh dewatering body 35 and the flexible water suction cylinder structure 32. An air intake space is formed between the flexible water suction cylinder structure 32 and the cylindrical wire mesh dewatering body 35. The gas discharged from the scrubbing tower 2 enters the air intake space and then enters the cylindrical wire mesh dewatering body 35 through the air intake space. During this process, the moisture entrained in the exhaust gas is intercepted and adsorbed by the cylindrical wire mesh 351, and the dry exhaust gas after water removal is discharged from the exhaust pipe 36 at the upper end of the cylindrical wire mesh dewatering body 35.

[0050] like Figure 7 and Figure 8 A sandwich structure is formed between the flexible water-absorbing cylinder structure 32 and the outer shell 31. The exhaust pipe 36 of the cylindrical wire mesh water-removing body 35 is equipped with an exhaust fan 10 (the exhaust pipe 36 is used for...). Figure 7In addition to the length shown, it also has an extended length, which is rotatably connected to the exhaust pipe 36 and directly connected to the air inlet of the bag filter 5. This extended length also has a flexible section at one end to compensate for the lifting of the flexible suction cylinder structure 32 with the upper shell 311. (Refer to...) Figure 2 (This lifting will be described below), so that the gas inside the air intake space can enter the cylindrical wire mesh dewatering body 35.

[0051] like Figure 7 and Figure 8 The drive mechanism 37 is located above the outer shell 31 and is used to drive the cylindrical wire mesh dewatering body 35 to rotate. Since the cylindrical wire mesh dewatering body 35 is in a continuous rotating state, the intercepted water is continuously thrown outward under the action of centrifugal force, avoiding the problem of water accumulating on the wire mesh surface to form a water film and then being carried out again by the airflow. The thrown water falls onto the synchronously rotating flexible water suction cylinder structure 32 and is absorbed by it; the centrifugal force generated by the rotation of the flexible water suction cylinder structure 32 further throws the absorbed water onto the inner wall of the outer shell 31. Since this splashed liquid is always located in the interlayer between the flexible water suction cylinder structure 32 and the outer shell 31, it does not come into contact with the airflow flowing in the air intake space. Therefore, it will not cause water to be carried into the air intake space and the interior of the cylindrical wire mesh dewatering body 35 by the airflow, thus solving the problem of secondary water carry-over.

[0052] like Figure 6 As shown, preferably, a drain pipe 38 is installed on one side of the interlayer. The lower end of the drain pipe 38 is fixedly connected to the upper end of the washing tower 2. Water that is thrown onto the inner wall of the outer shell 31 and collected at the bottom of the interlayer is discharged through the drain pipe 38. This allows the collected water to flow back to the washing tower 2 for replenishing the washing liquid in the washing tower 2, thus realizing the recycling of water resources.

[0053] Preferred, refer to Figure 8 The upper part of the inner shell 31 is fixed with a top seat 34, and the lower part of the inner shell 31 is fixed with a support base 33. The area of ​​the support base 33 opposite to the air intake space is provided with a hollow part 331. The exhaust gas treated by the scrubbing tower 2 enters the air intake space through the hollow part 331.

[0054] Combination Figure 8 and Figure 9Preferably, the above-mentioned tubular wire mesh dewatering body 35 includes a tubular wire mesh 351, an inner frame 353 inside the tubular wire mesh 351, an outer frame 352 outside the tubular wire mesh 351, a second end seal 355 at the upper end of the tubular wire mesh 351, and a first end seal 354 at the lower end. The cross-section of the second end seal 355 is T-shaped. The second end seal 355 is embedded in the top seat 34, and a bearing is provided between the second end seal 355 and the top seat 34. The first end seal 354 is supported on the support base 33, and the support base 33 is provided with a groove to accommodate the support base 33. A thrust bearing is provided in the groove to reduce the wear between the first end seal 354 and the bottom of the groove when the tubular wire mesh dewatering body 35 rotates.

[0055] Due to the function of the first end seal 354 and the second end seal 355, the airflow can only pass through the tubular wire mesh 351 from the outside and enter the interior of the tubular wire mesh 351.

[0056] In order to achieve the rotation of the cylindrical wire mesh dewatering body 35, the lower end of the exhaust pipe 36 is fixedly connected to the second end seal 355, and the upper end of the exhaust pipe 36 passes through the top surface of the outer shell 31. The drive mechanism 37 drives the exhaust pipe 36 to rotate, thereby causing the cylindrical wire mesh dewatering body 35 to rotate.

[0057] Preferably, the drive mechanism 37 includes a first bevel gear 371 fixed on the exhaust pipe 36, a second bevel gear 372 meshing on one side of the first bevel gear 371, and a motor 373 for driving the second bevel gear 372.

[0058] To maintain the rigidity of the flexible water-absorbing cylinder structure 32 and prevent it from deforming during rotation, the flexible water-absorbing cylinder structure 32 includes a flexible cylinder body 325 and a locking bolt 323. The flexible cylinder body 325 has first longitudinal ribs 321 evenly spaced along the circumferential direction and first annular ribs 322 evenly spaced along the axial direction. The locking bolt 323 extends from the inner surface of the flexible cylinder body 325 to the outer surface of the flexible cylinder body 325 and is located at the intersection of the first longitudinal ribs 321 and the first annular ribs 322. A nut is provided at the intersection of the locking bolt 323. The first longitudinal ribs 321 and the first annular ribs 322 intersect to form a reinforcing skeleton, which improves the overall structural strength of the flexible cylinder body 325 while ensuring its flexible water-absorbing performance, so that it can withstand the centrifugal force generated by high-speed rotation without deformation or tearing. Locking bolt 323 extends from the inner surface of the flexible cylinder body 325 to the outer surface, and is located at the intersection of the first longitudinal rib 321 and the first annular rib 322. A nut is tightened at this intersection to securely position the flexible cylinder body 325 onto the reinforcing frame. End seats 324 are fixed at both the upper and lower ends of the flexible cylinder body 325. The first longitudinal rib 321 is welded to the end seats 324, facilitating the overall forming of the flexible cylinder body 325. The end seats 324 are close to but do not contact the top seat 34 and the support base 33.

[0059] In addition, since the inner wall of the flexible cylinder body 325 only has bolts, the situation where the water absorption capacity is reduced due to the other supporting structures covering the inner wall area of ​​the flexible cylinder body 325 can be avoided.

[0060] Preferably, the flexible cylinder body 325 mentioned above is provided with a non-woven fabric layer 3251, a large pore layer 3252 and a fine pore layer 3253 from the inside to the outside.

[0061] The non-woven fabric layer 3251 faces the air intake space and the cylindrical wire mesh dehumidification body 35. Its relatively small pores prevent impurities in the wastewater from passing through, and also prevent a small amount of gas from passing through (the exhaust fan 10 on the exhaust pipe 36 creates a continuous negative pressure inside the wire mesh cylinder, naturally directing the gas towards the main path of the wire mesh). This avoids the problem of some wet waste gas leaking directly from the outside of the flexible suction cylinder structure 32 without being treated by the cylindrical wire mesh dehumidification body 35, thus affecting the overall dehumidification effect. This ensures that all gas enters the cylindrical wire mesh dehumidification body 35. The outer nonwoven fabric layer 3251 is absorbent, which facilitates the rapid adsorption of water ejected by the tubular wire mesh water removal body 35. The macroporous layer 3252 is located outside the nonwoven fabric layer 3251 and is used to further absorb and temporarily store the adsorbed water. The fine pore layer 3253 is located on the outermost side of the flexible cylinder body 325, that is, the side facing the inner wall of the outer shell 31. Its pores are finer than those of the macroporous layer 3252. While ensuring that the adsorbed water can still penetrate and be ejected to the inner wall of the outer shell 31, it can also prevent gas and liquid in the interlayer from returning to the air intake space.

[0062] Preferably, both the macroporous layer 3252 and the microporous layer 3253 are polyurethane foam.

[0063] Preferably, a high-pressure backwash pipe 310 is also provided on one side of the interlayer, which can periodically spray clean water onto the outer surface of the flexible cylinder body 325 for backwashing, washing away the dust and dirt adhering to the inner and outer surfaces of the flexible cylinder body 325 (that is, the inner surface of the non-woven fabric layer 3251). The wastewater generated by rinsing is discharged through the drain pipe 38 and returned to the washing tower 2, thereby extending the effective service life of the flexible water suction cylinder structure 32 and reducing the frequency of replacement.

[0064] Because the flexible water-absorbing cylinder structure 32 will age and deform after long-term use, resulting in a decrease in its water absorption capacity, a mechanism for replacing the flexible water-absorbing cylinder structure 32 is also provided, as detailed below:

[0065] The outer casing 31 includes a lower casing 312 and an upper casing 311 mounted on the upper end of the lower casing 312. A lifting frame 8 is fixedly mounted on the upper surface of the upper casing 311. A travel nut 9 is mounted on the lifting frame 8. A vertically arranged lifting screw 7 is provided inside the travel nut 9. The lower end of the lifting screw 7 is rotatably mounted on the flange of the lower casing 312, and a handwheel is provided at the lower end. When it is necessary to replace or maintain the flexible water suction cylinder structure 32, the operator turns the handwheel. Through the threaded engagement between the lifting screw 7 and the travel nut 9, the upper casing 311, together with the cylindrical wire mesh water removal body 35 and the flexible water suction cylinder structure 32, is lifted as a whole, exposing the flexible water suction cylinder structure 32 above the lower casing 312 for easy operation.

[0066] The connecting assembly 39 includes a first connecting rod 391 fixed to both sides of the outer frame 352, and a second connecting rod 392 fixed to the inner surface of the locking bolt 323. The first connecting rod 391 and the second connecting rod 392 are connected by bolts. When replacing the flexible water suction cylinder structure 32, it is only necessary to remove the connecting bolts between the first connecting rod 391 and the second connecting rod 392 to separate the flexible water suction cylinder structure 32 from the cylindrical wire mesh water removal body 35. Similarly, when installing a new flexible water suction cylinder structure 32, it can be reconnected by bolts. The operation is simple and quick.

[0067] The system also includes a replacement platform 6, the height of which is approximately equal to the height of the upper part of the flexible suction cylinder structure 32. Operators can stand on the replacement platform 6 to easily disassemble and install the exposed flexible suction cylinder structure 32 after it is raised, thus improving maintenance efficiency and operational safety.

[0068] On the other hand, the present invention also provides a method for the co-purification of dry and wet separated exhaust gas and dust for a board production line, applicable to a co-purification system for dry and wet separated exhaust gas and dust for a board production line, characterized by comprising the following steps:

[0069] Dry exhaust gas enters cyclone separator 4 for treatment, and the exhaust gas after treatment by cyclone separator 4 directly enters bag filter 5.

[0070] The wet exhaust gas is treated by condenser demister 1, scrubbing tower 2 and wire mesh dehumidifier 3, and the treated exhaust gas enters bag filter 5.

[0071] During dehumidification, the wire mesh dehumidifier 3 enters the tubular wire mesh dehumidification body 35 from the outside and exits. The rotating tubular wire mesh dehumidification body 35 can throw the wastewater toward the flexible water suction cylinder structure 32 and be absorbed by the flexible water suction cylinder structure 32. When the flexible water suction cylinder structure 32 rotates, it can throw the wastewater onto the inner wall of the outer shell 31.

[0072] By using the above-mentioned dry and wet separation pretreatment and terminal collaborative filtration method, targeted treatment of different types of pollution sources in the board production line is achieved, avoiding the problem of filter bag clogging caused by the mixing of dry and wet waste gas. At the same time, the dual rotating water-throwing structure of the cylindrical wire mesh water removal body 35 and the flexible water suction cylinder structure 32 effectively solves the problem of secondary carryover in the wet waste gas dehumidification process, improving the treatment effect and operational stability of the entire purification system.

[0073] During use (operation), (I) Main road dust removal process

[0074] In the sheet metal production line, machining stations such as cutting machines and edge grinding machines continuously generate dry dust during operation. This dust, along with the surrounding air, is collected by a sealed collection hood, forming dust-laden dry waste gas. Under negative pressure, this waste gas is transported along the main pipeline to cyclone separator 4. Once inside cyclone separator 4, the dry waste gas forms a high-speed rotating airflow. Dust particles are thrown against the cylinder wall by centrifugal force and spiral down the wall, exiting and being collected at the bottom of cyclone separator 4. The purified airflow exits from the top of cyclone separator 4. At this point, most of the large dust particles in the dry waste gas have been removed, and the airflow itself contains no moisture, allowing it to be directly transported along the pipeline to the final confluence point without additional dehumidification treatment.

[0075] (II) Dehumidification process in wet circuits

[0076] During the discharge process, wet curing stations such as autoclaves release wet waste gas (steam mist aerosol) with high temperature, extremely high humidity, and carrying fine dust. This wet waste gas is first collected and transported to a condenser demister 1. Inside the condenser demister 1, the wet waste gas exchanges heat with the low-temperature wall or cooling medium to cool down. During the temperature reduction process, the large water mist particles entrained in the gas condense, increase in weight, and settle out. The moisture content and temperature of the wet waste gas are initially reduced at this stage.

[0077] The wet exhaust gas, after preliminary treatment by the condenser demister 1, continues to enter the scrubbing tower 2 along the pipeline. The scrubbing tower 2 is equipped with a spray device that continuously sprays scrubbing liquid downwards. As the wet exhaust gas passes through the spray area from bottom to top, it comes into full contact with the mist-like scrubbing liquid. The residual suspended fine dust and soluble pollutants in the exhaust gas are captured and absorbed by the scrubbing liquid and settle to the bottom of the scrubbing tower 2 along with the scrubbing liquid. At the same time, the spray scrubbing process itself also introduces a certain amount of moisture into the airflow. Although the wet exhaust gas after this stage of treatment has achieved the removal of fine particulate matter, it still carries a high water vapor content and needs further deep dehumidification to meet the inlet requirements of the subsequent bag filter 5.

[0078] (III) Internal Working Principle of Wire Mesh Dehumidifier

[0079] After being treated by the scrubbing tower 2, the wet exhaust gas enters the interior of the wire mesh dehumidifier 3 through the wet exhaust gas inlet at the lower end of the outer shell 31, and then enters the annular air intake space formed between the flexible water suction cylinder structure 32 and the cylindrical wire mesh dehumidification body 35 through the hollow part 331 on the support base 33.

[0080] Meanwhile, the motor 373 above the outer casing 31 is continuously running, and its power is transmitted through the meshing of the second bevel gear 372 and the first bevel gear 371, driving the exhaust pipe 36 to rotate continuously around the vertical axis. Since the lower end of the exhaust pipe 36 is fixedly connected to the second end seal 355 of the cylindrical wire mesh dewatering body 35, the rotation of the exhaust pipe 36 directly drives the entire cylindrical wire mesh dewatering body 35 to rotate synchronously; and the flexible water suction cylinder structure 32 is fixedly connected to the cylindrical wire mesh dewatering body 35 through the connecting component 39, so the flexible water suction cylinder structure 32 rotates synchronously with the cylindrical wire mesh dewatering body 35. At this time, the exhaust fan 10 installed on the exhaust pipe 36 operates synchronously, forming a continuous negative pressure inside the exhaust pipe 36 and the central cavity of the cylindrical wire mesh dewatering body 35, which becomes the power source for driving the flow of wet waste gas.

[0081] Under the action of negative pressure suction, the wet exhaust gas in the intake space passes from the outside to the inside through the cylindrical wire mesh 351 of the high-speed rotating cylindrical wire mesh dehumidification body 35. The moisture carried in the wet exhaust gas is intercepted and adhered by the wire mesh the moment it passes through the wire mesh; because the cylindrical wire mesh dehumidification body 35 is in a continuous rotating state, the moisture adhering to the surface of the wire mesh has not yet had time to coalesce into a continuous water film, and is quickly thrown off the surface of the wire mesh under the action of centrifugal force, and is thrown out obliquely with the airflow direction, across the intake space, and falls onto the inner surface (i.e., the non-woven fabric layer 3251) of the outer flexible water absorption cylinder structure 32 that rotates synchronously. The dry airflow after the moisture is removed continues to rise along the central cavity of the cylindrical wire mesh dehumidification body 35, and is discharged from the outer shell 31 through the exhaust pipe 36, completing the re-dehumidification process.

[0082] Moisture that falls onto the inner surface of the flexible absorbent cylinder structure 32 is first absorbed by the non-woven fabric layer 3251, and then permeates outward to be stored in the macroporous layer 3252. Since the flexible absorbent cylinder structure 32 itself is also rotating at high speed synchronously with the cylindrical wire mesh dehumidification body 35, the absorbed and stored moisture is continuously subjected to centrifugal force, constantly being thrown towards the outermost fine pore layer 3253 of the flexible cylinder body 325 and seeping out, and then thrown onto the inner wall of the outer shell 31. The fine pore layer 3253 has dense pores, allowing moisture to continuously seep out and be discharged with the help of centrifugal force, but external moisture cannot easily penetrate the flexible cylinder body 325 and enter the interlayer through this path. This ensures that all wet waste gas must be dehumidified through the wire mesh structure of the cylindrical wire mesh dehumidification body 35, and there is no situation of gas bypassing or leaking.

[0083] The water splashed onto the inner wall of the outer casing 31 is confined within the interlayer between the flexible water suction cylinder structure 32 and the inner wall of the outer casing 31 because the flexible water suction cylinder structure 32 is located precisely between the air intake space and the inner wall of the outer casing 31. This prevents the water from splashing back or diffusing into the air intake space, thus avoiding contact with the airflow passing through the mesh. This avoids the secondary water carryover problem commonly found in traditional fixed plate-type mesh demisting structures. Through this dehumidification process, which consists of a primary centrifugal water removal by the cylindrical mesh dehumidification body 35 and a secondary centrifugal water removal by the flexible water suction cylinder structure 32, the dehumidification effect of the wet exhaust gas is significantly improved and long-term operation is stable.

[0084] The water that falls and collects at the bottom of the interlayer is discharged downward through the drain pipe 38 installed on one side of the interlayer. The lower end of the drain pipe 38 is fixedly connected to the upper end of the washing tower 2, so that the recovered water flows back into the washing tower 2 to replenish the washing liquid consumed by the washing tower 2 spraying, forming a closed loop of water resource recycling and reducing the overall water consumption of the system.

[0085] (iv) Regular maintenance process of flexible water suction cylinder structure

[0086] During long-term operation, fine dust carried in the wet exhaust gas will gradually adhere to the surface of the flexible suction cylinder structure 32, eventually forming a scale layer on its outer surface, affecting its water absorption and drainage performance. To address this, a high-pressure backwash pipe 310 located on one side of the interlayer can be used to spray clean water onto the outer surface of the flexible cylinder body 325 at a preset cycle (or based on detected changes in operating resistance) to perform reverse rinsing, washing away the attached dust and scale layer. The wastewater generated during rinsing is also discharged through the drain pipe 38 and returned to the scrubbing tower 2 for unified treatment, thus achieving online maintenance of the flexible suction cylinder structure 32 without shutting down the system and extending its effective service life.

[0087] When the flexible water-absorbing cylinder structure 32 needs to be replaced after long-term use, the operator turns the handwheel on the lifting frame 8 above the outer shell 31. Through the threaded transmission of the lifting screw 7 and the stroke nut 9, the upper shell 311, together with the cylindrical wire mesh dehumidifier body 35 and the flexible water-absorbing cylinder structure 32, is lifted upwards, so that the flexible water-absorbing cylinder structure 32 is completely exposed above the lower shell 312. The operator stands on the replacement platform 6, which is at a height similar to the upper end of the flexible water-absorbing cylinder structure 32. The operator then removes the connecting bolts between the first connecting rod 391 and the second connecting rod 392 in the connecting assembly 39, and the old flexible water-absorbing cylinder structure 32 can be separated from the cylindrical wire mesh dehumidifier body 35. After replacing the new flexible water-absorbing cylinder structure 32, the operation is reversed, the upper shell 311 is reconnected, and the operation is lowered to restore the normal operation of the wire mesh dehumidifier 3. The entire replacement process does not require disassembling the outer shell 31 or hoisting the entire machine, resulting in high maintenance efficiency.

[0088] (v) End-of-pipe co-processing

[0089] The dry exhaust gas discharged from the dry path after being treated by the cyclone separator 4, and the dry exhaust gas discharged from the wet path after being deeply dehumidified by the wire mesh dehumidifier 3, merge into a single total airflow at the pipeline confluence point and enter the bag filter 5 together. Since both airflows at this point have reached a low moisture content and a low dust concentration, there is no risk of dust sticking to the filter bags due to moisture. The filter bags in the bag filter 5 can continuously and stably capture residual fine dust particles in the airflow under clean and dry conditions. The clean gas filtered by the filter bags finally meets the emission standards, and the dust adhering to the surface of the filter bags is periodically removed by the dust removal mechanism built into the bag filter 5.

[0090] In summary, the system described in this invention pre-treats dry dust and wet exhaust gas separately along the dry and wet paths, and utilizes a dual synchronous rotating centrifugal water-throwing structure of the cylindrical wire mesh water removal body 35 and the flexible water suction cylinder structure 32 inside the wire mesh dehumidifier 3. This solves the problem of secondary carryover during the deep dehumidification process of wet exhaust gas, ultimately allowing the two gases to converge at the end after both have reached a clean and dry state. This achieves efficient and synergistic purification of exhaust gas and dust from the board production line, while also ensuring long-term stable operation and convenient maintenance of the equipment.

[0091] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0092] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A dry-wet separation type exhaust gas and dust co-purification system for a board production line, characterized in that, It includes a cyclone separator (4) for treating dry waste gas and a condenser demister (1) for treating wet waste gas. Downstream of the condenser demister (1) are a scrubbing tower (2) and a wire mesh dehumidifier (3). The gas discharged from the cyclone separator (4) and the wire mesh dehumidifier (3) enters the bag filter (5) for co-processing. The wire mesh dehumidifier (3) includes: The outer casing (31) is installed at the upper end of the scrubbing tower (2); The tubular wire mesh dewatering body (35) is rotatably installed inside the outer casing (31); A flexible water-absorbing cylinder structure (32) is located outside the tubular wire mesh water removal body (35) and is fixed to the tubular wire mesh water removal body (35) through a connecting component (39). An air intake space is formed between the flexible water-absorbing cylinder structure (32) and the tubular wire mesh water removal body (35). Gas enters the tubular wire mesh water removal body (35) through the air intake space and is discharged through the exhaust pipe (36) at the upper end of the tubular wire mesh water removal body (35). A sandwich is formed between the flexible water-absorbing cylinder structure (32) and the outer shell (31). The exhaust pipe (36) of the tubular wire mesh water removal body (35) is equipped with a blower (10). The driving mechanism (37) is located above the outer shell (31) and is used to drive the tubular wire mesh dewatering body (35) to rotate, so that the water on the tubular wire mesh dewatering body (35) is thrown into the flexible water suction cylinder structure (32) by centrifugal force. The flexible water suction cylinder structure (32) rotates with the tubular wire mesh dewatering body (35), and the water on the flexible water suction cylinder structure (32) is thrown onto the inner wall of the outer shell (31) by centrifugal force. The splashed liquid is located in the interlayer and does not come into contact with the airflow in the air intake space.

2. The dry and wet separation type exhaust gas and dust co-purification system for a board production line according to claim 1, characterized in that, A drain pipe (38) is installed on one side of the interlayer, and the lower end of the drain pipe (38) is fixedly connected to the upper end of the washing tower (2).

3. The dry and wet separation type exhaust gas and dust co-purification system for a board production line according to claim 1, characterized in that, The upper part of the inner shell (31) is fixed with a top seat (34), and the lower part of the inner shell (31) is fixed with a support base (33). The area on the support base (33) opposite to the air intake space is provided with a hollow part (331). The exhaust gas treated by the scrubbing tower (2) enters the air intake space through the hollow part (331).

4. The dry and wet separation type exhaust gas and dust co-purification system for a board production line according to claim 3, characterized in that, The tubular wire mesh dewatering body (35) includes a tubular wire mesh (351), an inner frame (353) inside the tubular wire mesh (351), an outer frame (352) outside the tubular wire mesh (351), a second end seal (355) at the upper end of the tubular wire mesh (351), a first end seal (354) at the lower end, the cross section of the second end seal (355) is T-shaped, the second end seal (355) is embedded in the top seat (34), and a bearing is provided between the second end seal (355) and the top seat (34), and the first end seal (354) is supported on the support base (33).

5. The dry and wet separation type exhaust gas and dust co-purification system for a board production line according to claim 3, characterized in that, The lower end of the exhaust pipe (36) is fixed to the second end seal (355), and the upper end of the exhaust pipe (36) passes through the top surface of the outer shell (31). The driving mechanism (37) drives the exhaust pipe (36) to rotate, thereby causing the cylindrical wire mesh dewatering body (35) to rotate.

6. The dry and wet separation type exhaust gas and dust co-purification system for a board production line according to claim 1, characterized in that, The flexible water-absorbing cylinder structure (32) includes a flexible cylinder body (325) and a locking bolt (323). The flexible cylinder body (325) is provided with first longitudinal ribs (321) at equal intervals along the circumferential direction. The flexible cylinder body (325) is provided with first annular ribs (322) at equal intervals along the axial direction. The locking bolt (323) extends from the inner surface of the flexible cylinder body (325) to the outer surface of the flexible cylinder body (325) and is located at the intersection of the first longitudinal ribs (321) and the first annular ribs (322). The locking bolt (323) is provided with a nut at the intersection.

7. The dry and wet separation type exhaust gas and dust co-purification system for a board production line according to claim 6, characterized in that, The drive mechanism (37) includes a first bevel gear (371) fixed on the exhaust pipe (36), a second bevel gear (372) meshing with one side of the first bevel gear (371), and a motor (373) for driving the second bevel gear (372).

8. The dry and wet separation type exhaust gas and dust co-purification system for a board production line according to claim 6, characterized in that, The flexible cylinder body (325) is provided with a non-woven fabric layer (3251), a large pore layer (3252), and a fine pore layer (3253) from the inside to the outside.

9. The dry and wet separation type exhaust gas and dust co-purification system for a board production line according to claim 6, characterized in that, The flexible cylinder body (325) is fixed with end seats (324) at both the upper and lower ends, and the first longitudinal rib (321) is welded to the end seats (324).

10. A method for the co-purification of dry and wet separated exhaust gas and dust in a board production line, applicable to the co-purification system for dry and wet separated exhaust gas and dust in a board production line as described in any one of claims 1-9, characterized in that, Includes the following steps: Dry exhaust gas enters the cyclone separator (4) for treatment, and the exhaust gas after treatment by the cyclone separator (4) directly enters the bag filter (5). The wet exhaust gas is treated by a condenser demister (1), a scrubbing tower (2) and a wire mesh dehumidifier (3), and the treated exhaust gas enters a bag filter (5). When dehumidifying, the wire mesh dehumidifier (3) enters the tubular wire mesh dehumidifier (35) from the outside and discharges it. The rotating tubular wire mesh dehumidifier (35) can throw the wastewater toward the flexible suction cylinder structure (32) and be absorbed by the flexible suction cylinder structure (32). When the flexible suction cylinder structure (32) rotates, it can throw the wastewater to the inner wall of the outer shell (31).

Images