An air purification tower

Abstract

This invention relates to the field of air purification tower equipment technology, specifically to an air purification tower, comprising a tower body, a tower support, tower plates, an overflow weir, and downcomers. The tower body is fixedly mounted on the tower support. Multiple tower plates are evenly distributed within the tower body, and overflow weirs are installed on the tower plates. Multiple downcomers are fixedly installed on the inner wall of the tower body, located below the tower plates. A detection device is installed on the tower plates to detect whether flooding has occurred in the area above the tower plates and to promptly notify the operator when flooding occurs. The detection device includes a detection plate mounted on the tower plate, with a rotating arm connected to the detection plate. This invention, through the cooperation of the detection device and the drainage device, promptly detects the height of the foam layer above the tower plates and, in conjunction with the drainage device, reduces the liquid layer height on the tower plates, decreasing the liquid load and promptly suppressing the gradually increasing foam layer to prevent flooding.

Description

Technical Field

[0001] This invention relates to the field of air purification tower equipment technology, specifically an air purification tower. Background Technology

[0002] Industrial waste gas is generated during fuel combustion and production processes in factory areas. This waste gas contains a large number of substances that are harmful to the human body. These substances enter the human body through the respiratory tract through different routes. Some of them cause direct harm, while others have an accumulation effect, which can seriously endanger human health. In order to prevent industrial waste gas from polluting the air, air purification towers are usually used to filter out harmful substances in industrial waste gas.

[0003] Currently, air purification towers used in industry include packed towers, turbulent ball towers, and plate towers. Plate towers, in particular, consist of layers of trays. Liquid enters from the top, while gas from the evaporator enters from the bottom. Under gravity, the liquid flows downwards through each tray until it exits at the bottom. Gas, propelled by the pressure difference, flows upwards through each tray until it exits at the top. Each tray maintains a certain liquid layer thickness. As gas passes through the liquid layer above the tray, harmful substances in the gas dissolve in the liquid and are discharged with it. The upward-flowing gas ultimately exits from the top, completing the air purification process.

[0004] The state of the gas and liquid phases on the tray changes successively from the bubbling stage to the foaming stage, then to the jetting stage, and finally remains in equilibrium at the jetting stage as the gas load gradually increases. During the jetting stage, the gas load is higher, and the mass transfer between the gas and liquid phases is faster, which is more conducive to air filtration. However, when the evaporator is heated too rapidly and the temperature suddenly rises, the gas load in the tray column suddenly increases, breaking this equilibrium. Gas impacts the liquid layer, generating a large number of bubbles, and the foam layer becomes increasingly tall. The foam layer gradually approaches the upper tray, and when it comes into contact with the upper tray, flooding occurs. During flooding, the liquid on the tray is carried to the upper tray by the ejected gas. The height of the foam layer on the tray continues to increase until it connects with the liquid on the upper tray. Subsequently, liquid communication occurs between all the trays in the column, and finally, the entire column is filled with liquid, a phenomenon known as flooding. Once flooding occurs, the equipment cannot operate and must be shut down to drain the excess liquid before normal operation can resume. Failure to effectively prevent flooding will severely restrict the efficiency of the tray column.

[0005] To address this issue, an air purification tower is proposed that can suppress the gradually increasing foam layer and prevent flooding by reducing the liquid thickness on the tower plate. Summary of the Invention

[0006] The purpose of this invention is to provide an air purification tower that, through the cooperation of a detection device and a drainage device, can promptly detect the height of the foam layer above the tower plate, and, in conjunction with the drainage device, reduce the liquid layer height on the tower plate to decrease the liquid phase load, thereby solving the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] An air purification tower includes a tower body, a tower support, tower plates, an overflow weir, and downcomers. The tower body is fixedly installed on the tower support. Multiple tower plates are evenly distributed inside the tower body. An overflow weir is installed on each tower plate. Multiple downcomers are fixedly installed on the inner wall of the tower body, and the downcomers are located below the tower plates. A detection device is installed on each tower plate. The detection device is used to detect whether flooding occurs in the area above the tower plates and to promptly notify the operator when flooding occurs.

[0009] Preferably, the detection device includes a detection plate mounted on a tower plate, a rotating arm connected to the detection plate, a slot on the rotating arm, a bracket fixedly mounted on the tower plate, a rod fixedly mounted on the bracket, and a contact switch fixedly mounted on the bracket. When the detection plate flips backward, it impacts the contact switch to close its circuit. The slot mates with the groove on the rod. A drainage device for resetting the detection device is rotatably mounted on the rotating arm. The drainage device reduces the liquid level on the tower plate, decreases the liquid load at the tower plate, and thus prevents flooding. Multiple alarms are installed on the tower body, and the alarms are electrically connected to the contact switch. Multiple through holes are provided on the detection plate. When no flooding occurs in the tower, the detection plate is parallel to the tower tray. When the foam layer height increases and pushes open the detection plate, the detection plate flips backward and strikes the contact switch. The contact switch is energized, triggering the alarm to sound a buzzer to notify the operator and pushing the drainage device downward to reduce the liquid level above the tower tray. Once flooding occurs, this process is extremely rapid. If the operator cannot detect flooding in time and take remedial measures, the entire tower will soon be filled with liquid and become inoperable. By installing a detection device above the tower tray and setting the detection plate at a predetermined height, when the foam layer impacts to that height, the alarm can be triggered in time to notify the operator and push the drainage device downward to reduce the liquid level on the tower tray, thereby reducing the foam layer height. By opening multiple through holes on the detection plate, the gas is prevented from being blocked by the detection plate during its ascent, which would affect the gas filtration quality.

[0010] Preferably, the drainage device includes a chute formed below the tower plate, a spring installed at the bottom of the chute, an overflow weir slidably mounted on the tower plate, a second bracket installed on the overflow weir, a second rod fixedly mounted on the second bracket, a through hole formed on the rotating arm, the rotating arm rotatably mounted on the second rod, and the inlet of the downcomer being on the same plane as the tower plate. When flooding is not occurring, the spring pushes the overflow weir upwards a portion, the height of which determines the height of the liquid layer above the tray. When flooding occurs, the rotating arm slides downwards, pushing the support connected to rod two downwards. Simultaneously, support two pushes the overflow weir downwards as well. As the overflow weir moves downwards in the chute, the liquid on the tray flows from the downcomer to the tray below, reducing the height of the liquid layer above the tray. As the liquid layer height decreases, the foam layer height also decreases due to the reduced liquid load. After the foam layer descends, the detection plate loses its impact force and returns to a parallel state. The overflow weir, no longer pushed by the rotating arm, recovers its height under the action of the spring. When the gas load is unstable, the states of the detection plate and the overflow weir will repeatedly switch under the influence of the foam layer, dynamically balancing to prevent flooding. By installing a drainage device on the tray to reduce the liquid load, the increase in the foam layer caused by excessive liquid accumulation due to the gas load is avoided. This prevents the foam layer from reaching the upper tray and connecting with the liquid on the upper tray after flooding, thus protecting the equipment and ensuring the quality of gas filtration.

[0011] Preferably, a defoaming device is installed on the tower plate. The defoaming device breaks up the air bubbles in the foam layer by spraying water or water droplets. The defoaming device includes a water spray hole opened in the center of the tower plate, a nozzle installed below the water spray hole, and a water supply pipe connected above the water spray hole. The inlet of the water supply pipe is located below the downcomer. A water valve for controlling the water flow is installed in the water supply pipe. The water valve is electrically connected to a contact switch. The nozzle is equipped with blades for driving the nozzle to rotate. After the overflow weir height is reduced, the foam layer height continues to increase and cross the detection plate in a short time because it takes time for the liquid layer to descend. If the foam layer reaches the upper tower plate and communicates with the liquid in the upper tower plate at this time, there is still a risk of flooding the tower. Once the tower is flooded, it will completely lose its filtration effect. At this time, it is necessary to stop the tower and drain the excess liquid in the tower before it can resume operation, which seriously affects the working efficiency. In this invention, when the foam layer height increases and pushes open the detection plate, the detection plate flips backward and hits the contact switch. The contact switch is energized to control the water valve. When the water supply pipe is turned on, water is sprayed from the nozzles to break up the air bubbles below. By installing nozzles under the trays, the liquid inside the tray is used as the water source for the nozzles. The sprayed water or droplets break up the air bubbles generated below, reducing the height of the foam layer and avoiding the risk of flooding the tray. While ensuring the working efficiency of the trays, using the liquid inside the tray as the water source, instead of introducing water from the outside, makes the entire structure simpler and reduces maintenance costs. When the water in the downcomer flows to the lower tray, the liquid in the downcomer cannot flow out completely due to the size of the downcomer gap, and a certain height of liquid will accumulate in this area. By placing the water inlet of the water supply pipe below the downcomer, the potential energy generated by the height of the liquid in the downcomer can be used to provide sufficient water pressure for the sprayed liquid, ensuring that the sprayed water is strong enough to break up the air bubbles generated below while resisting the upward airflow. By adding blades to the nozzles, the blades are driven by the upward airflow to rotate the nozzles, and the rotating nozzles have a larger spray range and better defoaming effect.

[0012] Preferably, the downcomer is provided with channel one and channel two. When the detection plate detects that the foam layer is too high and lowers the overflow weir, a large amount of liquid will flow down from the upper tray in a short time. The excessive flow will cause the liquid level in the downcomer to rise. If the liquid level is too high, the tower will be flooded, affecting the filtration quality. However, if the diameter of the downcomer is too wide, the liquid flow rate in the pipe will also be too fast. The air bubbles in the liquid in the downcomer will not have enough time to dissipate, and the separated gas may also be blocked by the high-speed overflow liquid on the plate, causing excessive resistance and possibly forming downcomer blockage and flooding. By setting an additional channel two in the downcomer, when the liquid load is normal, the liquid only flows down from channel one. When the liquid load suddenly increases and the liquid level in the downcomer rises, the rising liquid level will be left in channel two after reaching the inlet of channel two to avoid downcomer blockage and flooding. Excess liquid will flow quickly from top to bottom through all trays with the assistance of the drainage device and return to the outlet of the tower body.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0014] 1. By installing a detection device above the tray and setting the detection plate at a predetermined height, an alarm is promptly triggered to notify the operator and push the drainage device downwards. This reduces the height of the foam layer by lowering the liquid level on the tray. Multiple through holes are provided on the detection plate to prevent gas from being blocked during its ascent, thus affecting the gas filtration quality. The drainage device on the tray reduces the liquid load, preventing the foam layer from increasing due to excessive liquid accumulation in the gas phase. This also prevents the foam layer from reaching the upper tray and flooding the tower after flooding, thus protecting the equipment and ensuring the quality of gas filtration.

[0015] 2. By installing a defoaming device on the tower plate, the liquid inside the tower is used as the water source for the nozzles. The sprayed water or droplets break up the bubbles generated below, reducing the height of the foam layer and avoiding the risk of flooding the tower. While ensuring the working efficiency of the tower plate, using the liquid inside the tower as the water source, instead of introducing water from the outside, makes the whole structure simpler and the maintenance cost lower. By placing the water inlet of the water supply pipe below the downcomer, the potential energy generated by the liquid height in the downcomer can be used to provide sufficient water pressure for the sprayed liquid, ensuring that the sprayed water flow is sufficient to break up the bubbles generated below while resisting the rising airflow. By adding blades to the nozzles, the blades are driven by the rising airflow to rotate the nozzles, and the rotating nozzles have a larger spray range and better defoaming effect.

[0016] 3. By setting an additional channel two in the downcomer, when the liquid load is normal, the liquid only flows down from channel one. When the liquid load suddenly increases and the liquid level in the downcomer rises, the rising liquid level leaves in channel two after reaching the inlet of channel two, avoiding blockage and flooding of the downcomer. Excess liquid flows quickly from top to bottom through all the trays with the assistance of the drainage device and flows back to the outlet of the tower body. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention;

[0018] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0019] Figure 3 This is a schematic diagram of the detection device and drainage device in this invention;

[0020] Figure 4 This is a schematic diagram illustrating the operation of the flooding detection device and the drainage device in this invention;

[0021] Figure 5 for Figure 3 Sectional view at point AA;

[0022] Figure 6 for Figure 3 Sectional view at CC

[0023] Figure 7 for Figure 6 Enlarged view at point D

[0024] Figure 8 This is a schematic diagram of the downcomer structure in this invention;

[0025] Figure 9 for Figure 8 Sectional view at point BB.

[0026] In the diagram: 1. Tower body; 2. Tower support; 3. Tower plate; 4. Downcomer; 5. Overflow weir; 6. Support 1; 7. Support 2; 8. Rod 1; 9. Rod 2; 10. Rotating arm; 11. Detection plate; 12. Slot 1; 13. Slide groove; 14. Spring; 15. Nozzle; 16. Blade; 17. Water supply pipe; 18. Channel 1; 19. Channel 2; 20. Alarm; 21. Spray hole; 22. Water valve; 23. Contact switch. Detailed Implementation

[0027] 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.

[0028] Example 1, please refer to Figures 1 to 9 This invention provides an air purification tower. When excessive gas phase pressure leads to flooding, the technical solution is as follows:

[0029] An air purification tower includes a tower body 1, a tower support 2, tower plates 3, an overflow weir 5, and downcomers 4. The tower body 1 is fixedly installed on the tower support 2. Multiple tower plates 3 are evenly distributed within the tower body 1. An overflow weir 5 is installed on each tower plate 3. Multiple downcomers 4 are fixedly installed on the inner wall of the tower body 1, located below the tower plates 3. A detection plate 11 is provided on each tower plate 3, and a rotating arm 10 is connected to the detection plate 11. A slot 12 is formed on the rotating arm 10. A bracket 6 is fixedly installed on each tower plate 3, and a rod 8 is fixedly installed on the bracket 6. A contact switch 23 is fixedly installed on the bracket 6. The slot 12 mates with the slot of the rod 8. Multiple alarms 20 are installed on the tower body 1, and the alarms 20 are electrically connected to the contact switches 23. A sliding groove 13 is formed below the tower plate 3. A spring 14 is installed at the bottom of the chute 13. The overflow weir 5 is slidably installed on the tower plate 3. A bracket 2 7 is installed on the overflow weir 5. A rod 2 9 is fixedly installed on the bracket 2 7. The rotating arm 10 is rotatably installed on the rod 2 9. The inlet of the downcomer 4 is on the same plane as the tower plate 3. A spray hole 21 is opened in the center of the tower plate 3. A nozzle 15 is installed below the spray hole 21. A water valve 22 for controlling the water flow is set above the spray hole 21. The water valve 22 is electrically connected to the contact switch 23. A water supply pipe 17 is connected to the spray hole 21. The inlet of the water supply pipe 17 is located below the downcomer 4. Multiple through holes are opened on the detection plate 11. A blade 16 for driving the nozzle 15 to rotate is set on the nozzle 15. The downcomer 4 is respectively provided with channel 1 18 and channel 2 19.

[0030] Before officially starting use, the nozzle 15 needs to be manually rotated to ensure it can rotate normally and its spray range covers the entire tower plate 3. Then, the detection plate 11 is lifted by hand to simulate the increase in foam layer height, and the overflow weir 5 is observed to see if it can be lowered normally and whether the friction between the rotating joints is too large. If the friction is obviously too large, the tightness of the joints needs to be adjusted to ensure that the detection plate 11 is not affected by too much friction during lifting and lowering, so as not to affect the detection accuracy. Then, the waterproof motor is turned on to observe whether the impeller can rotate normally. After all checks are completed, water is injected into the water inlet of the tower body 1. The water flows from the water inlet pipe of the tower body 1 into the top downcomer 4 and then flows from the downcomer 4 to the tower plate 3 below. The liquid flows down the tower plate 3 above the tower body 1 step by step and is finally discharged from the water outlet below the tower body 1. It is then pumped back to the water inlet above the tower body 1 for one cycle. Then, the gas to be filtered is introduced into the air inlet below the tower body 1. The introduced gas quickly fills the space at the bottom. When the pressure in the space is high enough, the airflow will overcome the obstruction. The liquid flows out from the point of least pressure, which is the multiple vents on tray 3. At this point, the liquid flowing from the vents gradually decreases due to the influence of gas pressure, until the gas is ejected from the vents and no more liquid flows down. The accumulated liquid can only flow down through downcomer 4. According to the change of gas pressure from low to high, the phenomenon exhibited by the gas between the liquid layers on tray 3 changes from bubbling to foaming and then to jetting. As the pressure increases, the liquid turns into foam under the impact of the gas. The foams collide and break up with each other. At this time, the mass transfer between the gas and liquid phases is relatively fast, and the filtration effect of the waste gas gradually increases. As the gas pressure continues to increase, a large amount of gas rushes out from the vents. The rushing gas disperses and breaks the liquid on tray 3 into countless droplets of different sizes. At this time, the height of the foam layer gradually increases. When the height of the foam layer approaches the upper tray 3, flooding occurs. After flooding, the two liquid layers are interconnected. Subsequently, flooding occurs on each tray 3, eventually leading to tower flooding. After tower flooding, the pressure drop in the tower body 1 increases sharply, and the filtration efficiency decreases sharply until the filtration effect is completely lost.In this invention, when the foam layer height increases and pushes open the detection plate 11, the detection plate 11 flips backward and strikes the contact switch 23. The contact switch 23 is energized, triggering the alarm 20 to emit a buzzer to notify the operator. Subsequently, the rotating arm 10 connected to the detection plate 11 slides downward, pushing the bracket 7 connected to the rod 9 downward together. At the same time, the bracket 7 pushes the overflow weir 5 downward as well. When the overflow weir 5 moves downward in the chute 13, it will reduce the height of the liquid layer above the tower plate 3. When the liquid layer height decreases, the reduced liquid will prevent the generation of more foam. After a period of time, the liquid layer will also decrease. However, since the liquid layer takes time to descend, the foam layer height continues to increase and surpass the detection plate 11 in a short period of time. If the foam layer reaches the upper tower plate 3 and connects with the liquid in the upper tower plate 3 at this time, there is still a risk of flooding the tower. At the same time, the contact switch 23 controls the water valve 22 to open, and the water in the water supply pipe 17 is sprayed out from the nozzle 15 to break the bubbles below. The blades 16 on the nozzle 15 are driven by the rising airflow to rotate the nozzle 15, so that the entire foam layer area can obtain a good defoaming effect. When the height of the foam layer drops, the detection plate 11 no longer contacts the contact switch 23, and the water valve 22 will remain open for a few seconds to ensure a good defoaming effect. While solving the problem of excessive foam layer height below, the nozzles 15 on each tray 3 drain water down step by step, which makes up for the problem of reduced flow in the downcomer 4 under this situation, and adjusts the flow of liquid between each layer to further avoid flooding. When the detection plate 11 detects that the foam layer is too high and lowers the overflow weir 5, a large amount of liquid will flow down from the upper tray 3 in a short time. The excessive flow will cause the liquid level in the downcomer 4 to rise. When the liquid level reaches the inlet of the channel 2 19, the liquid level in the downcomer 4 will not continue to rise, and the liquid will flow down the tray 3 from the channel 2 19, avoiding flooding caused by blockage of the downcomer 4.

[0031] Example 2, please refer to Figures 1 to 9 This invention provides an air purification tower. When the gas phase pressure is too low and the purification effect of the tower body 11 is poor, the technical solution is as follows:

[0032] In Example 2, unlike Example 1, when the gas phase pressure is too low, the dynamic pressure of the gas through the riser channel is insufficient to prevent the liquid on the plate from flowing down through the channel, resulting in leakage. The leakage affects the full contact between the gas and liquid on the tray 3, causing the efficiency of the tray 3 to decrease. Severe leakage will prevent the tray 3 from accumulating liquid and make it inoperable. In this case, the height of the overflow weir 5 can be appropriately reduced by replacing the spring 14 at the bottom of the slide 13 and selecting a spring 14 with a smaller precision coefficient, thereby reducing the height of the liquid layer on the tray 3. When the liquid layer height is reduced, the resistance to the gas will be reduced, allowing the tower body 1 to work normally.

[0033] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An air purification tower, comprising a tower body, a tower support, tower plates, an overflow weir, and downcomers, wherein the tower body is fixedly installed on the tower support, multiple tower plates are evenly distributed within the tower body, overflow weirs are installed on the tower plates, and multiple downcomers are fixedly installed on the inner wall of the tower body, the downcomers being located below the tower plates, characterized in that, The tower plate is equipped with a detection device to detect whether flooding has occurred in the area above the tower plate and to notify the operator in a timely manner when flooding occurs; multiple alarms are installed on the tower body and are electrically connected to contact switches. The detection device includes a detection plate mounted on a tower plate, which has multiple through holes. A rotating arm is connected to the detection plate, and a slot is formed on the rotating arm. A bracket is fixedly mounted on the tower plate, and a rod is fixedly mounted on the bracket. A contact switch is fixedly mounted on the bracket. When the detection plate flips backward, it will strike the contact switch and close its circuit. The slot and the rod are grooved together. A drainage device for resetting the detection device is rotatably mounted on the rotating arm. The drainage device includes a chute located below the tower plate, with a spring installed at the bottom of the chute. An overflow weir is slidably installed on the tower plate, and a second bracket is installed on the overflow weir. A second rod is fixedly installed on the second bracket, and a rotating arm is rotatably installed on the second rod. The inlet of the downcomer is on the same plane as the tower plate, and an antifoaming device is installed on the tower plate. The downcomer is provided with channel one and channel two respectively. The defoaming device includes a water spray hole in the center of the tray, with a nozzle installed below the spray hole; a water valve for controlling the water flow is installed above the spray hole, and the water valve is electrically connected to a contact switch; the nozzle is equipped with blades for driving the nozzle to rotate, and the blades can use the rising airflow to drive the nozzle to rotate; a pressurizing device is connected above the spray hole, and the pressurizing device includes a water supply pipe connected to the spray hole, with the water inlet of the water supply pipe located below the downcomer, using the potential energy generated by the liquid height difference in the downcomer to pressurize the water pressure of the nozzle.

2. An air purification tower according to claim 1, characterized in that: Drainage devices are used to reduce the height of the liquid layer on the trays, thereby reducing the liquid load on the trays and eliminating flooding.

3. An air purification tower according to claim 1, characterized in that: The defoaming device breaks up the air bubbles floating on the water surface by spraying water or water droplets, eliminating the foam generated during the production process and preventing the liquid from flowing between the upper and lower trays and causing flooding.

4. An air purification tower according to claim 1, characterized in that: The pressurizing device is used to pressurize the liquid inside the spray nozzle.

5. An air purification tower according to claim 1, characterized in that: Multiple through holes can prevent the gas from being blocked by the detection plate during its ascent, thus affecting the gas filtration quality.

6. An air purification tower according to claim 1, characterized in that: When the liquid level in channel one is too high, the liquid can flow down from channel two to reduce the drainage pressure in channel one.

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