Formaldehyde production tail gas absorption tower capable of avoiding blockage

Abstract

The present application relates to tail gas environmental protection treatment technical field, specifically is involved in a kind of tail gas absorption tower for avoiding blockage of formaldehyde production, including installation in the top of tail gas absorption tower anti-blocking adsorption device, anti-blocking adsorption device includes installation in the top of tail gas absorption tower connecting channel, connecting channel is equipped with storage track inside, storage track is used to store activated carbon, the bottom of storage track is equipped with regulation and control filter plate, the filtering end of regulation and control filter plate extends to the inside of storage track, regulation and control filter plate is used to guide tail gas to the inside of storage track, the below of regulation and control filter plate is also equipped with airflow dredging device, airflow dredging device is used to dredge and clean regulation and control filter plate, the below of airflow dredging device is also equipped with dustproof ventilation frame, connecting channel is also equipped with air pressure detector inside, the both sides of storage track are equipped with quick material replacement device, quick material replacement device is used to replace activated carbon inside storage track, the present application effectively improves adsorption filtration effect, and simultaneously improve work efficiency.

Description

Technical Field

[0001] This invention relates to the field of exhaust gas environmental protection treatment technology, specifically to an exhaust gas absorption tower for formaldehyde production that avoids clogging. Background Technology

[0002] The formaldehyde production process generates a large amount of exhaust gas containing harmful substances. If this exhaust gas is released directly without effective treatment, it will cause serious environmental pollution and endanger human health. Therefore, formaldehyde production exhaust gas absorption towers have become an indispensable key piece of equipment in the formaldehyde production industry. Their main function is to purify the formaldehyde production exhaust gas, reduce the content of harmful substances in the exhaust gas, and make it meet environmental emission standards.

[0003] Chinese Patent No. CN221452168U discloses an environmentally friendly formaldehyde production tail gas absorption tower. The device includes a housing containing, from bottom to top, a combustion chamber, a vacuum chamber, a water washing chamber, and a condensation chamber. It is also equipped with multiple baffles, exhaust pipes, and condensation components. Its working principle is to effectively remove combustible and water-soluble substances from the formaldehyde production tail gas through combustion and water washing steps, reducing the adsorption pressure on the activated carbon filter material. A liquid nitrogen box is used to cool and dehumidify the water-washed tail gas, preventing the activated carbon filter material from becoming damp and affecting its adsorption capacity. A removable top cover and mesh frame allow for the replacement of the activated carbon filter material, and components such as a limit box, fan, and silicone rings ensure the normal operation and sealing performance of the equipment. This device achieves multiple treatments of formaldehyde production tail gas to a certain extent, reducing the pressure of treating harmful substances at each stage, reducing maintenance frequency, and saving manpower.

[0004] However, in practical applications, existing formaldehyde production exhaust gas absorption towers still have many problems in the activated carbon filtration stage. Currently, the common activated carbon filtration method uses a mesh frame to hold the activated carbon. When activated carbon particles fall directly into the mesh frame, the smaller particles easily clog the pores after absorbing moisture. This clogging severely affects the flow efficiency of the exhaust gas, increasing the flow resistance within the absorption tower. This prevents the exhaust gas from smoothly passing through every area of ​​the activated carbon filter layer, resulting in some areas of the activated carbon failing to adsorb effectively, thus reducing the overall processing capacity and purification effect of the exhaust gas absorption tower.

[0005] Furthermore, once the activated carbon reaches saturation, the mesh frame needs to be manually disassembled to replace it. This process is not only labor-intensive but also quite cumbersome. Replacing the activated carbon requires stopping the equipment, which forces an interruption in the formaldehyde production process, severely impacting production efficiency. Summary of the Invention

[0006] To address the aforementioned issues, a formaldehyde production tail gas absorption tower that avoids clogging is provided. The anti-clogging adsorption device can effectively improve the adsorption and filtration effect, while also increasing work efficiency.

[0007] To address the problems of existing technologies, this invention provides a formaldehyde production tail gas absorption tower that avoids clogging. The tower includes an anti-clogging adsorption device installed at the top. This device includes a connecting channel at the top of the tower, with a storage rail installed inside the channel. The storage rail stores activated carbon, and a regulating filter plate is installed at the bottom of the storage rail. The filter end of the regulating filter plate extends into the storage rail, guiding the tail gas flow towards the interior of the storage rail. An airflow clearing device is installed below the regulating filter plate to clear and clean it. A dustproof ventilation frame is also installed below the airflow clearing device. A pressure detector is installed inside the connecting channel, and quick-change devices are installed on both sides of the storage rail to replace the activated carbon inside the storage rail.

[0008] Preferably, the storage rail is installed at an angle inside the connecting channel. One end of the storage rail is provided with a feed inlet, and the end of the storage rail away from the feed inlet is provided with a discharge outlet. Both the feed inlet and the discharge outlet are equipped with detachable first sealing plates. The bottom of the storage rail is provided with several mounting holes for installing control filter plates. A pressure plate is slidably installed on the top of the storage rail. The pressure plate is provided with several first screen holes. A buffer spring is provided between the pressure plate and the storage rail.

[0009] Preferably, the regulating filter plate is provided with a plurality of filter screen sleeves, the filter screen sleeves are slidably connected to the mounting holes, the inner wall of the filter screen sleeves is provided with a plurality of second screen holes, and the filter plate is further provided with a first linear actuator for driving the regulating filter plate to move.

[0010] Preferably, the airflow clearing device includes a movable frame installed below the regulating filter plate, a plurality of rotating nozzles are provided on the movable frame, and multiple sets of synchronous rotation drive devices for driving the plurality of rotating nozzles to rotate are also provided on the movable frame. Multiple air supply pipes for supplying airflow to the rotating nozzles are also installed on the movable frame. The airflow clearing device also includes a second linear drive for driving the movable frame to move.

[0011] Preferably, a rotating top block is rotatably mounted on the top of the rotating nozzle, and a strip-shaped rubber nozzle is provided on the side of the rotating nozzle.

[0012] Preferably, the dustproof ventilation rack includes an installation frame installed below the airflow unblocking device. The interior of the installation frame is provided with a first V-shaped plate and a second V-shaped plate arranged alternately. Multiple first V-shaped plates and second V-shaped plates are provided and distributed at equal intervals. The gap between the first V-shaped plates and the second V-shaped plates forms an airflow channel.

[0013] Preferably, the quick material changing device includes a quantitative feeding rail and a quantitative collecting rail installed on the storage rail. The quantitative feeding rail is rotatably connected to the inlet of the storage rail, and the quantitative collecting rail is rotatably connected to the outlet of the storage rail.

[0014] Preferably, the quantitative feeding rail is provided with a first docking interface that connects with the feed inlet, the first docking interface is provided with a detachable second sealing plate, the side of the quantitative feeding rail is provided with a ball screw slide, the movable end of the ball screw slide is equipped with a push plate, the push plate is located inside the quantitative feeding rail, and a first vibration motor is installed on the quantitative feeding rail.

[0015] Preferably, the quantitative collection rail is provided with a second pair of interfaces that connect with the discharge port, the bottom of the quantitative collection rail is provided with a discharge port, the discharge port is provided with a third sealing plate, and a second vibration motor is installed on the quantitative collection rail.

[0016] Preferably, the quick material change device further includes a traction rotation device for driving the quantitative feeding rail and the quantitative collection rail to rotate. The traction rotation device includes a traction frame installed on the outside of the connecting channel, a winding device installed on the traction frame, and two traction ropes installed on the winding device. The two traction ropes are respectively connected to the quantitative feeding rail and the quantitative collection rail.

[0017] The advantages of this invention compared to the prior art are:

[0018] 1. In the formaldehyde production tail gas treatment process, despite pretreatment such as combustion, water washing, and liquid nitrogen cooling and dehumidification, the tail gas still contains a small amount of moisture. In traditional activated carbon filtration devices, activated carbon dust adsorbs moisture and easily clogs the filter components, leading to uneven tail gas flow and affecting the adsorption effect. However, this device is equipped with a pressure detector and airflow unblocking device in the connecting channel. The pressure detector can monitor the internal pressure of the connecting channel in real time. When activated carbon dust adsorbs moisture and adheres to the flow area of ​​the regulating filter plate, causing blockage and increasing the internal pressure of the connecting channel, the pressure detector can detect it in time. Upon detecting this change, the airflow unblocking device was quickly activated. This device, tightly fitted to the regulating filter plate, delivers high-pressure gas to its flow area. The powerful impact of the high-pressure gas precisely clears and unclogs the blockage, rapidly restoring the flowability of the regulating filter plate. This allows the exhaust gas to pass evenly and smoothly through the regulating filter plate into the storage rail, ensuring that the activated carbon in each area of ​​the storage rail is fully in contact with the exhaust gas. This achieves uniform adsorption and filtration of the exhaust gas, effectively improving the adsorption and filtration effect of the entire exhaust gas absorption tower and reducing the risk of reduced processing capacity due to localized blockages.

[0019] 2. Traditional activated carbon filtration devices require manual disassembly of the mesh frame when replacing activated carbon, which is cumbersome, time-consuming, and labor-intensive, and also necessitates stopping the equipment, severely impacting formaldehyde production efficiency. This invention is equipped with a rapid material replacement device. When the activated carbon in the storage rail becomes saturated and needs replacement, the exhaust gas absorption tower only needs to reduce the exhaust gas emission rate without completely stopping operation. Subsequently, the regulating filter plate is activated, causing its flow area to exit the storage rail and close, effectively preventing airflow in the connecting channel from entering the storage rail, creating a safe and stable environment for activated carbon replacement. Then, the rapid material replacement device starts working, accurately and quickly loading new activated carbon into the storage rail while orderly discharging the saturated activated carbon. After replacement, the flow area of ​​the regulating filter plate re-enters the storage rail and restores flow. The entire activated carbon replacement process is rapid and efficient, requiring no long-term equipment shutdown, achieving uninterrupted operation of the equipment, greatly improving the continuity of formaldehyde production and overall production efficiency, and reducing economic losses caused by equipment downtime. Attached Figure Description

[0020] Figure 1 This is a three-dimensional schematic diagram of a formaldehyde production tail gas absorption tower designed to prevent clogging, according to the present invention. Figure 1 .

[0021] Figure 2 This is a front view of a formaldehyde production tail gas absorption tower that avoids clogging, according to the present invention.

[0022] Figure 3 yes Figure 2 Planar sectional view at section AA.

[0023] Figure 4 yes Figure 3 A three-dimensional schematic diagram.

[0024] Figure 5 This is a three-dimensional schematic diagram of a formaldehyde production tail gas absorption tower designed to prevent clogging, according to the present invention. Figure 2 .

[0025] Figure 6 This is a schematic diagram of the working state of a formaldehyde production tail gas absorption tower that avoids clogging, according to the present invention.

[0026] Figure 7 yes Figure 6 A magnified view of a section at point B.

[0027] Figure 8 This is a three-dimensional schematic diagram of the material storage rail, regulating filter plate, and airflow unblocking device in a formaldehyde production tail gas absorption tower that avoids clogging, according to the present invention.

[0028] Figure 9 This is a three-dimensional schematic diagram of a formaldehyde production tail gas absorption tower for preventing clogging, according to the present invention, which includes a filter plate control and an airflow unblocking device.

[0029] Figure 10 This is a three-dimensional schematic diagram of an airflow unblocking device in a formaldehyde production tail gas absorption tower to avoid clogging, according to the present invention.

[0030] Figure 11 yes Figure 6 A magnified view of a section at point C.

[0031] The numbers on the map are:

[0032] 1. Exhaust gas absorption tower; 2. Connecting channel; 3. Storage rail; 31. Inlet; 32. Outlet; 33. First sealing plate; 34. Pressure plate; 35. Buffer spring; 4. Regulating filter plate; 41. Filter screen sleeve; 42. First linear actuator; 5. Airflow unblocking device; 51. Moving frame; 52. Second linear actuator; 53. Rotary nozzle; 531. Rotating top block; 532. Strip rubber nozzle; 54. Synchronous rotation drive device; 55. Gas transmission pipeline; 6. Dustproof ventilation frame; 61. Mounting frame; 62. First V-shaped plate; 63. Second V-shaped plate; 7. Quick material changer Device; 71. Quantitative feeding rail; 711. First docking interface; 712. Ball screw slide; 713. Push plate; 714. First vibrating motor; 715. Second sealing plate; 72. Quantitative collection rail; 721. Second docking interface; 722. Discharge port; 723. Third sealing plate; 724. Second vibrating motor; 73. Traction rotation device; 731. Traction frame; 732. Winding device; 733. Traction rope; 734. First rotation locking mechanism; 7341. Locking rod; 7342. Locking bracket; 7343. Positioning bolt; 735. Second rotation locking mechanism. Detailed Implementation

[0033] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0034] See Figures 1 to 11As shown, a formaldehyde production tail gas absorption tower designed to prevent clogging includes an anti-clogging adsorption device installed at the top of the tail gas absorption tower 1. The anti-clogging adsorption device comprises a connecting channel 2 installed at the top of the tail gas absorption tower 1. A storage rail 3 is installed inside the connecting channel 2 for storing activated carbon. A regulating filter plate 4 is installed at the bottom of the storage rail 3, with its filter end extending into the storage rail 3. The regulating filter plate 4 guides the tail gas flow into the storage rail 3. An airflow clearing device 5 is installed below the regulating filter plate 4 for clearing and cleaning the regulating filter plate 4. A dustproof ventilation frame 6 is also installed below the airflow clearing device 5. A pressure detector is also installed inside the connecting channel 2. Quick material replacement devices 7 are installed on both sides of the storage rail 3 for replacing the activated carbon inside the storage rail 3.

[0035] The main body of the exhaust gas absorption tower 1 pre-treats the formaldehyde production exhaust gas through combustion and water washing steps, effectively removing combustible and water-soluble substances from the exhaust gas and reducing the adsorption pressure of the subsequent activated carbon filter material; the exhaust gas after water washing is cooled and dehumidified using a liquid nitrogen box, but the treated exhaust gas still contains a small amount of moisture.

[0036] The pretreated exhaust gas rises into the connecting channel 2 of the anti-clogging adsorption device. Within the connecting channel 2, the exhaust gas sequentially passes through the dustproof ventilation frame 6, the airflow unblocking device 5, and the regulating filter plate 4, finally entering the storage rail 3. The dustproof ventilation frame 6 guides the airflow upwards evenly and prevents activated carbon dust from falling directly to the components below.

[0037] Activated carbon is stored in the storage rail 3. After the exhaust gas enters the storage rail 3, the activated carbon adsorbs and filters the exhaust gas. However, since the exhaust gas still contains a small amount of moisture, if the activated carbon dust adsorbs the moisture and adheres to the flow area of ​​the regulating filter plate 4, it can easily cause blockage in the flow area of ​​the regulating filter plate 4, resulting in a reduction in the exhaust gas flow efficiency.

[0038] To monitor and regulate the flow of the filter plate 4, a pressure detector is installed inside the connecting channel 2. When the pressure detector detects an increase in the pressure inside the connecting channel 2, it indicates that the flow area of ​​the filter plate 4 is blocked. At this time, the airflow unblocking device 5 is activated. The airflow unblocking device 5 is in contact with the filter plate 4 and delivers high-pressure gas to the flow area of ​​the filter plate 4. The high-pressure gas is used to unblock and clean the flow area of ​​the filter plate 4, restoring the flowability of the filter plate 4, ensuring that the exhaust gas can pass through evenly and smoothly, and ensuring that the activated carbon inside the storage rail 3 can evenly adsorb the filtered exhaust gas, thereby improving the adsorption and filtration effect.

[0039] When the activated carbon in the storage rail 3 becomes saturated and needs replacement, the exhaust gas absorption tower 1 reduces the exhaust gas emission rate. Then, the regulating filter plate 4 is activated, causing its flow area to exit the storage rail 3 and close, preventing airflow from the connecting channel 2 into the storage rail 3. Next, the rapid material replacement device 7 is activated, quickly loading new activated carbon into the storage rail 3 while simultaneously discharging the saturated activated carbon. After the activated carbon replacement is complete, the flow area of ​​the regulating filter plate 4 re-enters the storage rail 3 and restores its flowability. The entire process does not require prolonged equipment shutdown, effectively achieving uninterrupted operation and improving work efficiency.

[0040] See Figures 1 to 4 As shown, the storage rail 3 is installed at an inclination inside the connecting channel 2. One end of the storage rail 3 is provided with a feed inlet 31, and the other end of the storage rail 3 away from the feed inlet 31 is provided with a discharge outlet 32. Both the feed inlet 31 and the discharge outlet 32 ​​are equipped with detachable first sealing plates 33. The bottom of the storage rail 3 is provided with several mounting holes for installing the regulating filter plate 4. The top of the storage rail 3 is slidably equipped with a pressure plate 34, which is provided with several first screen holes. A buffer spring 35 is provided between the pressure plate 34 and the storage rail 3.

[0041] The storage rail 3 has an inlet 31 at one end and an outlet 32 ​​at the other end, both equipped with a removable first sealing plate 33. When adding new activated carbon, the first sealing plate 33 of the inlet 31 is removed, and the new activated carbon is injected into the storage rail 3 through the quick material changer 7. When the activated carbon in the storage rail 3 becomes saturated and needs to be discharged, the first sealing plate 33 of the outlet 32 ​​is removed, and the saturated activated carbon is discharged from the outlet 32 ​​using the quick material changer 7. The first sealing plate 33 is in a closed state when not being used for material changes, effectively preventing exhaust gas leakage and activated carbon dust spillage, ensuring the sealing and stability of the equipment operation.

[0042] The bottom of the storage rail 3 has several mounting holes. The regulating filter plate 4 is installed at the bottom of the storage rail 3 through the mounting holes, and the filter end of the regulating filter plate 4 extends into the storage rail 3. This allows the exhaust gas rising from the connecting channel 2 to flow evenly into the activated carbon area inside the storage rail 3 under the guidance of the regulating filter plate 4.

[0043] A pressure plate 34 is slidably mounted on the top of the storage rail 3. The pressure plate 34 has several first screen holes to facilitate the upward flow of exhaust gas. A buffer spring 35 is installed between the pressure plate 34 and the storage rail 3. When the flow area of ​​the regulating filter plate 4 extends into the storage rail 3, compressing the activated carbon inside, the activated carbon pushes the pressure plate 34 upward. The pressure plate 34 then compresses the buffer spring 35, causing it to elastically deform. The elastic reaction force of the buffer spring 35 causes the pressure plate 34 to exert downward pressure on the activated carbon, thus keeping the activated carbon in a compacted state. This reduces the gaps between activated carbon particles and prevents exhaust gas from passing through without sufficient adsorption and filtration.

[0044] See Figures 4 to 9 As shown, the control filter plate 4 is provided with a plurality of filter screen sleeves 41, the filter screen sleeves 41 are slidably connected to the mounting holes, the inner wall of the filter screen sleeves 41 is provided with a plurality of second screen holes, and also includes a first linear actuator 42 for driving the control filter plate 4 to move.

[0045] The regulating filter plate 4 is equipped with several filter screen sleeves 41, which are slidably connected to the mounting holes at the bottom of the storage rail 3. The inner wall of each filter screen sleeve 41 has several second sieve holes. When the exhaust gas rises from the connecting channel 2 and reaches the regulating filter plate 4, it is guided by the regulating filter plate 4 to permeate through the second sieve holes in the inner wall of the filter screen sleeve 41 into the activated carbon inside the storage rail 3. This design allows the exhaust gas to flow evenly to the activated carbon area, ensuring that the activated carbon fully adsorbs and filters the exhaust gas, thus improving the efficiency and effectiveness of exhaust gas treatment.

[0046] During the exhaust gas treatment process, although the exhaust gas has undergone pretreatment, it still contains a small amount of moisture. Activated carbon dust, after adsorbing this moisture, may adhere to the second screen openings. However, the design of the filter sleeve 41, which is vertically inserted into the storage rail 3, effectively reduces the amount of activated carbon dust adhering to it. This reduces dust accumulation in localized areas, thereby lowering the risk of clogging and ensuring the smooth flow of exhaust gas.

[0047] The first linear actuator 42 can drive the regulating filter plate 4 to extend and retract. When the regulating filter plate 4 moves, it will drive several filter screen sleeves 41 to move synchronously. Under normal working conditions, the filter screen sleeves 41 are inserted into the storage rail 3, and the exhaust gas enters the activated carbon layer for adsorption and filtration through the second sieve holes. When it is necessary to replace the activated carbon, the air inlet channel of the storage rail 3 must be closed. At this time, the first linear actuator 42 drives the regulating filter plate 4 to move, causing the filter screen sleeves 41 to exit the mounting hole until the top of the filter screen sleeves 41 stops in the mounting hole, thereby sealing the mounting hole and preventing the airflow in the connecting channel 2 from entering the storage rail 3, thus providing conditions for the replacement of activated carbon.

[0048] See Figures 4 to 10As shown, the airflow clearing device 5 includes a movable frame 51 installed below the control filter plate 4. The movable frame 51 is provided with a number of rotating nozzles 53. The movable frame 51 is also provided with a number of synchronous rotation drive devices 54 that drive the rotating nozzles 53 to rotate. The movable frame 51 is also provided with a number of air supply pipes 55 that supply airflow to the rotating nozzles 53. The airflow clearing device 5 also includes a second linear drive 52 that drives the movable frame 51 to move.

[0049] The air pressure detector monitors the air pressure inside the connecting channel 2 in real time. During the normal operation of the exhaust gas absorption tower 1, if the second sieve holes of the filter screen sleeve 41 in some areas become clogged due to the accumulation of moisture adsorbed by activated carbon dust, the exhaust gas flow will be obstructed, leading to an abnormal increase in air pressure inside the connecting channel 2. When the air pressure detector detects that the air pressure inside the connecting channel 2 exceeds the preset normal range, it determines that there is a blockage, and at this time, the air pressure detector sends a start signal to the airflow unblocking device 5.

[0050] The second linear actuator 52 in the airflow unblocking device 5 starts working after receiving a start signal, driving the moving frame 51 to move towards the regulating filter plate 4 until the moving frame 51 is tightly fitted with the regulating filter plate 4. The moving frame 51 is equipped with several rotating nozzles 53, which precisely insert into the interior of the filter screen sleeve 41 during the movement of the moving frame 51. The number and position of the rotating nozzles 53 correspond to the filter screen sleeve 41, ensuring that each filter screen sleeve 41 that may become clogged is effectively unblocked.

[0051] When the rotating nozzle 53 is inserted into the filter screen sleeve 41, the synchronous rotation drive device 54 starts, driving several rotating nozzles 53 to rotate synchronously. Simultaneously, the gas supply pipe 55, connected to the gas supply equipment, begins to deliver high-pressure gas to the rotating nozzles 53. The gas supply pipe 55 delivers stable high-pressure gas to the rotating nozzles 53. During its rotation, the rotating nozzle 53 evenly blows the high-pressure gas into the second sieve holes on the inner wall of the filter screen sleeve 41 in a rotating jet manner. The powerful airflow impact effectively disperses and blows away activated carbon dust and other blockages adhering to the second sieve holes, thereby achieving rapid unblocking of the clogged area.

[0052] Both the gas transmission equipment and the synchronous rotary drive device 54 are existing technologies and will not be described in detail here.

[0053] See Figure 10 and Figure 11 As shown, a rotating top block 531 is rotatably mounted on the top of the rotating nozzle 53, and a strip-shaped rubber nozzle 532 is provided on the side of the rotating nozzle 53.

[0054] When the airflow unblocking device 5 receives the start signal, the second linear actuator 52 drives the moving frame 51 to move towards the regulating filter plate 4, causing the rotating nozzle 53 mounted on the moving frame 51 to approach the filter screen sleeve 41. The rotating nozzle 53 is rotatably mounted on the moving frame 51. During insertion, the rotating top block 531 on the top of the rotating nozzle 53 abuts against the top of the filter screen sleeve 41. The rotating top block 531 ensures that the rotating nozzle 53 is stably positioned during insertion, reducing shaking and deviation during the insertion process, and ensuring that the rotating nozzle 53 can accurately enter the interior of the filter screen sleeve 41. At the same time, the strip-shaped rubber nozzle 532 on the side of the rotating nozzle 53 will contact the inner wall of the filter screen sleeve 41. The strip-shaped rubber nozzle 532 has a certain degree of flexibility and elasticity, which can adapt to the shape of the inner wall of the filter screen sleeve 41 during contact, ensuring a good fit and preparing for subsequent airflow jet unblocking.

[0055] Once the rotating nozzle 53 is accurately inserted into the filter sleeve 41 and completes positioning and contact, the synchronous rotation drive device 54 is activated. The synchronous rotation drive device 54 drives several rotating nozzles 53 to rotate synchronously. Simultaneously with the rotation of the rotating nozzle 53, the gas delivery pipe 55, connected to the gas delivery equipment, begins to deliver high-pressure gas to the rotating nozzle 53. According to preset pressure and flow parameters, the gas delivery pipe 55 delivers stable high-pressure gas into the rotating nozzle 53. After entering the rotating nozzle 53, the high-pressure gas flows towards the side-mounted strip-shaped rubber nozzle 532. The strip-shaped rubber nozzle 532 compresses the flowing gas. As the gas passes through the strip-shaped rubber nozzle 532, the cross-sectional area of ​​the nozzle decreases, the gas velocity increases, and the pressure further increases, causing the compressed gas to concentrate and be ejected at high speed from the nozzle.

[0056] During its rotation, the rotating nozzle 53 drives the compressed high-speed airflow to rotate and spray along the inner wall of the filter screen 41. This ensures that the high-pressure airflow can evenly cover all parts of the inner wall of the filter screen 41. The powerful airflow impact force can effectively disperse and blow away activated carbon dust and other blockages attached to the second screen holes. As the rotating nozzle 53 continues to rotate, the compressed gas continuously impacts and cleans the second screen holes, achieving a stable and efficient unblocking effect.

[0057] See Figures 1 to 4 As shown, the dustproof ventilation rack 6 includes an installation frame 61 installed below the airflow unblocking device 5. The interior of the installation frame 61 is provided with a first V-shaped plate 62 and a second V-shaped plate 63 arranged in an alternating manner. There are multiple first V-shaped plates 62 and second V-shaped plates 63, which are distributed at equal intervals. The gap between the first V-shaped plates 62 and the second V-shaped plates 63 forms an airflow channel.

[0058] When the pre-treated exhaust gas rises from below into the area where the dustproof ventilation rack 6 is located, the exhaust gas will flow upward along the airflow channel. During the upward process, the exhaust gas can be evenly guided and dispersed, avoiding the phenomenon of eddies or uneven airflow in local areas, thus ensuring that the exhaust gas can flow upward smoothly and orderly.

[0059] During the operation of the exhaust gas absorption tower 1, a certain amount of activated carbon dust is generated when the activated carbon in the storage rail 3 adsorbs and filters the exhaust gas. Although the regulating filter plate 4 has a certain filtering and blocking effect on the exhaust gas and dust, some activated carbon dust may still pass through the regulating filter plate 4 and fall downwards.

[0060] When the falling activated carbon dust enters the dustproof ventilation rack 6 area, multiple first V-shaped plates 62 and second V-shaped plates 63 act as interceptors. Because the first V-shaped plates 62 and second V-shaped plates 63 have a V-shaped structure and are arranged in an alternating pattern, the activated carbon dust comes into contact with the surfaces of the first V-shaped plates 62 and second V-shaped plates 63 during its descent. This prevents the dust from moving downwards and causes it to remain on the first V-shaped plates 62 and second V-shaped plates 63.

[0061] See Figures 1 to 3 As shown, the quick material changing device 7 includes a quantitative feeding rail 71 and a quantitative collecting rail 72 installed on the storage rail 3. The quantitative feeding rail 71 is rotatably connected to the inlet 31 of the storage rail 3, and the quantitative collecting rail 72 is rotatably connected to the outlet 32 ​​of the storage rail 3.

[0062] When the activated carbon in the storage rail 3 becomes saturated and needs to be replaced, the metering feed rail 71 and the metering collection rail 72 are driven to rotate. The metering feed rail 71 is pre-stored with a metered amount of new activated carbon, while the metering collection rail 72 is empty and ready to collect the saturated old activated carbon. As it rotates, the metering feed rail 71 gradually rotates to align with the inlet 31 of the storage rail 3, and the metering collection rail 72 rotates to align with the outlet 32 ​​of the storage rail 3. After the metering feed rail 71 and the metering collection rail 72 are aligned with the storage rail 3, the tail gas absorption tower 1 first reduces the tail gas emission rate to minimize the impact of tail gas treatment during the material replacement process. Subsequently, the regulating filter plate 4 is activated, and the flow area of ​​the regulating filter plate 4 is withdrawn from the mounting hole at the bottom of the storage rail 3 and closed. On the one hand, this keeps the inside of the storage rail 3 flat, creating conditions for the smooth loading and unloading of activated carbon; on the other hand, it prevents the airflow in the connecting channel 2 from entering the storage rail 3, avoiding interference from tail gas with the activated carbon replacement operation during the material replacement process.

[0063] After the filter plate 4 has completed its operation, the first sealing plates 33 on the inlet 31 and outlet 32 ​​are opened. At this time, the metering feed rail 71 starts working, pushing the new activated carbon pre-stored inside the metering feed rail 71 towards the storage rail 3. Because the storage rail 3 is inclined, the new activated carbon smoothly enters the storage rail 3 under the action of gravity and the pressure of the metering feed rail 71. At the same time, the old activated carbon that was originally saturated in the storage rail 3 is squeezed out from the outlet 32 ​​and enters the metering collection rail 72 under the push of the new activated carbon. The inclined setting of the storage rail 3 effectively increases the flow rate of the activated carbon and improves the efficiency of loading and unloading.

[0064] Once the new activated carbon has fully entered the storage rail 3 and all the old activated carbon has entered the metering collection rail 72, the first sealing plates 33 on the inlet 31 and outlet 32 ​​are closed to ensure the sealing of the storage rail 3 and the connecting channel 2. Then, the metering feed rail 71 and metering collection rail 72 are driven to rotate in opposite directions, returning them to their initial positions, ready for the next material replacement operation. After completing the above steps, the regulating filter plate 4 is activated, allowing its flow area to re-enter the mounting hole at the bottom of the storage rail 3 and restore flow, enabling the exhaust gas to smoothly re-enter the storage rail 3 for adsorption and filtration by the new activated carbon. The entire material replacement process does not require prolonged equipment shutdown, effectively achieving uninterrupted operation and improving work efficiency.

[0065] See Figures 3 to 6 As shown, the quantitative feeding rail 71 is provided with a first docking interface 711 that connects with the feed inlet 31. The first docking interface 711 is provided with a detachable second sealing plate 715. The side of the quantitative feeding rail 71 is provided with a ball screw slide 712. The movable end of the ball screw slide 712 is equipped with a push plate 713. The push plate 713 is located inside the quantitative feeding rail 71. A first vibration motor 714 is installed on the quantitative feeding rail 71.

[0066] When the metering feed rail 71 is not involved in the material replacement operation, the second sealing plate 715 on its first docking interface 711 is in a closed state, isolating the internal space of the metering feed rail 71 from the outside world and preventing the leakage or external contamination of the pre-stored metered new activated carbon. When the activated carbon in the storage rail 3 is saturated and needs to be replaced, the metering feed rail 71 is driven to rotate, so that the first docking interface 711 is precisely docked with the feed inlet 31. After docking, the second sealing plate 715 is opened, so that the first docking interface 711 is connected to the feed inlet 31. The ball screw slide 712 is started, and the moving end of the ball screw slide 712 drives the push plate 713 to move linearly inside the metering feed rail 71. During the movement, the push plate 713 applies a pushing force to the new activated carbon pre-stored inside the metering feed rail 71, pushing the activated carbon towards the storage rail 3.

[0067] Meanwhile, to improve the feeding speed of activated carbon and ensure its smooth and rapid entry into the storage rail 3, a first vibration motor 714 is installed on the metering feed rail 71. When the first vibration motor 714 is working, it generates vibration, which is transmitted to the activated carbon inside the metering feed rail 71 through its housing. The vibration reduces the friction between the activated carbon particles, making their relative movement easier, thereby reducing the resistance during the feeding process and improving the flowability and feeding speed of the activated carbon.

[0068] See Figures 3 to 6 As shown, the quantitative collection rail 72 is provided with a second interface 721 that connects with the discharge port 32, the bottom of the quantitative collection rail 72 is provided with a discharge port 722, the discharge port 722 is provided with a third sealing plate 723, and a second vibration motor 724 is installed on the quantitative collection rail 72.

[0069] When the activated carbon in the storage rail 3 becomes saturated and needs to be replaced, the second pair of interfaces 721 on the quantitative collection rail 72 aligns with the outlet 32 ​​of the storage rail 3. At this time, the quantitative collection rail 72 is in an empty state, and its internal space is prepared to receive the old activated carbon. After the alignment with the outlet 32 ​​is completed, the tail gas absorption tower 1 reduces the tail gas emission rate, activates the regulating filter plate 4 to allow its flow area to exit from the mounting hole at the bottom of the storage rail 3 and close, and then opens the first sealing insert plate 33 on the outlet 32. At the same time, the quantitative feeding rail 71 starts working, pushing the pre-stored new activated carbon towards the storage rail 3. Because the storage rail 3 is inclined, the new activated carbon smoothly enters the storage rail 3 under the action of gravity and the pressure of the quantitative feeding rail 71, and pushes the old activated carbon in the storage rail 3 that is saturated with adsorption towards the outlet 32. The old activated carbon enters the second pair of interfaces 721 of the aligned quantitative collection rail 72 through the outlet 32, and then falls into the interior of the quantitative collection rail 72.

[0070] During this process, the second vibration motor 724 installed on the metering collection rail 72 starts to work. The second vibration motor 724 generates high-frequency vibration, which is transmitted to the used activated carbon inside the housing of the metering collection rail 72. The vibration reduces the friction between the used activated carbon particles, making the relative movement between particles easier, thereby reducing the resistance of the used activated carbon in the process of entering the metering collection rail 72. This effectively avoids the blockage of the used activated carbon at the discharge port 32 or inside the metering collection rail 72, and improves the collection efficiency of the used activated carbon.

[0071] Once the new activated carbon has completely entered the storage rail 3 and all the old activated carbon has entered the metering collection rail 72, the first sealing plate 33 on the discharge port 32 is closed to ensure the sealing of the storage rail 3 and the connecting channel 2 and prevent exhaust gas leakage. At the same time, the third sealing plate 723 on the discharge port 722 at the bottom of the metering collection rail 72 is also closed, sealing the collected old activated carbon inside the metering collection rail 72, awaiting subsequent discharge operations.

[0072] When it is necessary to discharge the used activated carbon collected in the metering collection rail 72, the third sealing plate 723 on the discharge port 722 is opened, and the second vibration motor 724 is restarted. The high-frequency vibration generated by the second vibration motor 724 reduces the cohesive force between the used activated carbon particles in the metering collection rail 72, making the particles looser and easier to discharge from the discharge port 722. The vibration also promotes the flow of used activated carbon at the bottom of the metering collection rail 72, accelerating the discharge speed and ensuring that the used activated carbon can be completely and smoothly discharged from the discharge port 722, thus improving the discharge efficiency.

[0073] See Figures 3 to 7 As shown, the quick material changing device 7 also includes a traction rotation device 73 that drives the quantitative feeding rail 71 and the quantitative collection rail 72 to rotate. The traction rotation device 73 includes a traction frame 731 installed on the outside of the connecting channel 2. A winding device 732 is installed on the traction frame 731. Two traction ropes 733 are installed on the winding device 732. The two traction ropes 733 are respectively connected to the quantitative feeding rail 71 and the quantitative collection rail 72.

[0074] The traction rotation device 73 also includes a first rotation locking mechanism 734 and a second rotation locking mechanism 735. The first rotation locking mechanism 734 is installed on the quantitative feeding rail 71, and the second rotation locking mechanism 735 is installed on the quantitative collection rail 72. The first rotation locking mechanism 734 and the second rotation locking mechanism 735 have the same structure. The first rotation locking mechanism 734 includes a locking rod 7341 fixedly installed on the quantitative feeding rail 71, and a locking bracket 7342 installed on the outside of the connecting channel 2. The locking bracket 7342 is provided with a positioning bolt 7343 for locking the locking rod 7341.

[0075] When the exhaust gas absorption tower 1 is operating normally and no activated carbon replacement is required, the traction rotation device 73 is in its initial state. At this time, the winding device 732 is in a relaxed state, and the two traction ropes 733 hang naturally without applying tension to the metering feed rail 71 and the metering collection rail 72. The metering feed rail 71 and the metering collection rail 72 are respectively in a non-intercepting position with the inlet 31 and outlet 32 ​​of the storage rail 3, and are in a standby state. The positioning bolt 7343 in the first rotation locking mechanism 734 is in the loose position, and the locking rod 7341 can rotate freely within a certain range; similarly, the positioning bolt 7343 in the second rotation locking mechanism 735 is also in a loose state, providing freedom for the rotation of the metering collection rail 72.

[0076] When the activated carbon in the storage rail 3 becomes saturated and the quick material replacement device 7 needs to be activated to replace the activated carbon, the traction rotation device 73 starts working. The winding device 732 starts, driving the two traction ropes 733 to retract synchronously. The traction frame 731 is installed on the outside of the connecting channel 2, and its main function is to guide the winding path of the traction ropes 733, ensuring that the traction ropes 733 can retract in a predetermined direction and trajectory, thereby ensuring that a stable tension is applied to the quantitative feeding rail 71 and the quantitative collection rail 72. During the winding process, the two traction ropes 733 apply tension to the quantitative feeding rail 71 and the quantitative collection rail 72 respectively, driving the quantitative feeding rail 71 and the quantitative collection rail 72 to rotate stably around their respective rotation connection points.

[0077] During the rotation of the quantitative feeding rail 71 and the quantitative collection rail 72, the first rotating locking mechanism 734 and the second rotating locking mechanism 735 play a positioning role. Taking the quantitative feeding rail 71 as an example, the fixedly installed locking rod 7341 rotates synchronously with the quantitative feeding rail 71. As the quantitative feeding rail 71 rotates, the locking rod 7341 also gradually rotates. When the quantitative feeding rail 71 rotates to a suitable position that precisely aligns with the inlet 31 of the storage rail 3, the locking rod 7341 also rotates simultaneously to a position corresponding to the locking bracket 7342 installed on the outside of the connecting channel 2. At this time, the operator operates the positioning bolt 7343, inserting the positioning bolt 7343 into the corresponding hole on the locking bracket 7342, so that the positioning bolt 7343 is in close contact with the locking rod 7341 and limits its movement, thereby preventing the quantitative feeding rail 71 from rotating or shifting during subsequent operations and achieving stable positioning. The quantitative collection rail 72 is rotated and positioned in the same way through the second rotating locking mechanism 735.

[0078] Specific working principle:

[0079] The main body of the exhaust gas absorption tower 1 pre-treats the formaldehyde production exhaust gas through combustion and water washing steps, effectively removing combustible and water-soluble substances from the exhaust gas and reducing the adsorption pressure of the subsequent activated carbon filter material; the exhaust gas after water washing is cooled and dehumidified using a liquid nitrogen box, but the treated exhaust gas still contains a small amount of moisture.

[0080] The pretreated exhaust gas rises into the connecting channel 2 of the anti-clogging adsorption device. Within the connecting channel 2, the exhaust gas sequentially passes through the dustproof ventilation frame 6, the airflow unblocking device 5, and the regulating filter plate 4, finally entering the storage rail 3. The dustproof ventilation frame 6 guides the airflow upwards evenly and prevents activated carbon dust from falling directly to the components below.

[0081] Activated carbon is stored in the storage rail 3. After the exhaust gas enters the storage rail 3, the activated carbon adsorbs and filters the exhaust gas. However, since the exhaust gas still contains a small amount of moisture, if the activated carbon dust adsorbs the moisture and adheres to the flow area of ​​the regulating filter plate 4, it can easily cause blockage in the flow area of ​​the regulating filter plate 4, resulting in a reduction in the exhaust gas flow efficiency.

[0082] To monitor and regulate the flow of the filter plate 4, a pressure detector is installed inside the connecting channel 2. When the pressure detector detects an increase in the pressure inside the connecting channel 2, it indicates that the flow area of ​​the filter plate 4 is blocked. At this time, the airflow unblocking device 5 is activated. The airflow unblocking device 5 is in contact with the filter plate 4 and delivers high-pressure gas to the flow area of ​​the filter plate 4. The high-pressure gas is used to unblock and clean the flow area of ​​the filter plate 4, restoring the flowability of the filter plate 4, ensuring that the exhaust gas can pass through evenly and smoothly, and ensuring that the activated carbon inside the storage rail 3 can evenly adsorb the filtered exhaust gas, thereby improving the adsorption and filtration effect.

[0083] When the activated carbon in the storage rail 3 becomes saturated and needs replacement, the exhaust gas absorption tower 1 reduces the exhaust gas emission rate. Then, the regulating filter plate 4 is activated, causing its flow area to exit the storage rail 3 and close, preventing airflow from the connecting channel 2 into the storage rail 3. Next, the rapid material replacement device 7 is activated, quickly loading new activated carbon into the storage rail 3 while simultaneously discharging the saturated activated carbon. After the activated carbon replacement is complete, the flow area of ​​the regulating filter plate 4 re-enters the storage rail 3 and restores its flowability. The entire process does not require prolonged equipment shutdown, effectively achieving uninterrupted operation and improving work efficiency.

[0084] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of protection of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A formaldehyde production tail gas absorption tower for preventing clogging, comprising an anti-clogging adsorption device installed at the top of the tail gas absorption tower (1), characterized in that, The anti-clogging adsorption device includes a connecting channel (2) installed at the top of the tail gas absorption tower (1), a storage rail (3) installed inside the connecting channel (2), the storage rail (3) is used to store activated carbon, a regulating filter plate (4) is installed at the bottom of the storage rail (3), the filter end of the regulating filter plate (4) extends into the storage rail (3), the regulating filter plate (4) is used to guide the tail gas flow into the storage rail (3), an airflow clearing device (5) is installed below the regulating filter plate (4), the airflow clearing device (5) is used to clear and clean the regulating filter plate (4), a dustproof ventilation rack (6) is also installed below the airflow clearing device (5), a pressure detector is also installed inside the connecting channel (2), and a quick material replacement device (7) is installed on both sides of the storage rail (3), the quick material replacement device (7) is used to replace the activated carbon inside the storage rail (3); The storage rail (3) is installed at an inclination inside the connecting channel (2). One end of the storage rail (3) is provided with a feed inlet (31), and the other end of the storage rail (3) away from the feed inlet (31) is provided with a discharge outlet (32). Both the feed inlet (31) and the discharge outlet (32) are equipped with detachable first sealing plates (33). The bottom of the storage rail (3) is provided with several mounting holes for installing the control filter plate (4). The top of the storage rail (3) is slidably equipped with a pressure plate (34). The pressure plate (34) is provided with several first screen holes. A buffer spring (35) is provided between the pressure plate (34) and the storage rail (3). The filter plate (4) is provided with several filter screen sleeves (41), the filter screen sleeves (41) are slidably connected to the mounting holes, the inner wall of the filter screen sleeves (41) is provided with several second screen holes, and also includes a first linear actuator (42) for driving the filter plate (4) to move. The airflow clearing device (5) includes a movable frame (51) installed below the regulating filter plate (4), a number of rotating nozzles (53) are provided on the movable frame (51), a number of synchronous rotating drive devices (54) are provided on the movable frame (51) to drive the number of rotating nozzles (53) to rotate, a number of air supply pipes (55) are also installed on the movable frame (51) to supply airflow to the rotating nozzles (53), and the airflow clearing device (5) also includes a second linear drive (52) to drive the movable frame (51) to move.

2. The formaldehyde production tail gas absorption tower for preventing clogging according to claim 1, characterized in that, A rotating top block (531) is rotatably mounted on the top of the rotating nozzle (53), and a strip-shaped rubber nozzle (532) is provided on the side of the rotating nozzle (53).

3. The formaldehyde production tail gas absorption tower for preventing clogging according to claim 1, characterized in that, The dustproof ventilation rack (6) includes an installation frame (61) installed below the airflow unblocking device (5). The interior of the installation frame (61) is provided with a first V-shaped plate (62) and a second V-shaped plate (63) arranged in an alternating manner. There are multiple first V-shaped plates (62) and second V-shaped plates (63) and they are evenly distributed. The gap between the first V-shaped plates (62) and the second V-shaped plates (63) forms an airflow channel.

4. The formaldehyde production tail gas absorption tower for preventing clogging according to claim 1, characterized in that, The quick material change device (7) includes a quantitative feeding rail (71) and a quantitative collection rail (72) installed on the storage rail (3). The quantitative feeding rail (71) is rotatably connected to the inlet (31) of the storage rail (3), and the quantitative collection rail (72) is rotatably connected to the outlet (32) of the storage rail (3).

5. A formaldehyde production tail gas absorption tower for preventing clogging according to claim 4, characterized in that, The quantitative feeding rail (71) is provided with a first docking interface (711) that connects with the feed inlet (31). The first docking interface (711) is provided with a detachable second sealing plate (715). The side of the quantitative feeding rail (71) is provided with a ball screw slide (712). The movable end of the ball screw slide (712) is equipped with a push plate (713). The push plate (713) is located inside the quantitative feeding rail (71). The quantitative feeding rail (71) is equipped with a first vibration motor (714).

6. A formaldehyde production tail gas absorption tower for preventing clogging according to claim 4, characterized in that, The quantitative collection rail (72) is provided with a second pair of interfaces (721) that connects with the discharge port (32). The bottom of the quantitative collection rail (72) is provided with a discharge port (722). The discharge port (722) is provided with a third sealing plate (723). The quantitative collection rail (72) is equipped with a second vibration motor (724).

7. A formaldehyde production tail gas absorption tower for preventing clogging according to claim 4, characterized in that, The quick material change device (7) also includes a traction rotation device (73) that drives the quantitative feeding rail (71) and the quantitative collection rail (72) to rotate. The traction rotation device (73) includes a traction frame (731) installed on the outside of the connecting channel (2). A winding device (732) is installed on the traction frame (731). Two traction ropes (733) are installed on the winding device (732). The two traction ropes (733) are connected to the quantitative feeding rail (71) and the quantitative collection rail (72) respectively.

Images