Formaldehyde waste gas treatment tail gas absorption tower

Abstract

This invention relates to the field of formaldehyde waste gas treatment and discloses a tail gas absorption tower for formaldehyde waste gas treatment, including a tower body and a gas outlet pipe fixedly installed above the tower body. A liquid inlet pipe is provided on one side of the tower body, and a liquid outlet pipe is provided below the outer side of the tower body. An air intake mechanism is provided at the lower inside of the tower body. The air intake mechanism includes a connecting component located at the lower inside of the tower body, a fixing component located below the connecting component, multiple sets of installation components located below the fixing component, a rotating component located below the installation component, and an exhaust fan located inside the connecting component. In this invention, gas is forced into the absorbent liquid at the bottom of the U-shaped tube within the connecting bend, forming large bubbles. As the large bubbles rise due to buoyancy, they are cut by the connecting disc, breaking the single large bubble into countless small bubbles, thereby increasing the total surface area of ​​the gas. The smaller the bubble, the larger the specific surface area, allowing more formaldehyde molecules to come into contact with the absorbent liquid and react in a short time.

Description

Technical Field

[0001] This invention relates to the field of formaldehyde waste gas treatment technology, specifically to a tail gas absorption tower for formaldehyde waste gas treatment. Background Technology

[0002] In the patent application with publication number CN217163802U, there is an absorption tower body. A water tank is installed on one side of the absorption tower body. A conveying pipe is installed between the water tank and the absorption tower body. A sprayer with an atomizing nozzle is installed on the lower surface of one end of the conveying pipe. An exhaust pipe is installed at the top of the absorption tower body. An air inlet pipe is installed on one side of the absorption tower body. A drain outlet is opened on the lower side of the absorption tower body. When the device is in use, the droplets flow from top to bottom along the surface of multiple sets of fan-shaped plates, so that a water curtain is formed in the gap between two adjacent sets of fan-shaped plates. This allows the exhaust gas to pass through the water curtain before it can continue to rise, thereby slowing down the rising speed of the exhaust gas and purifying the gas again.

[0003] In the aforementioned patent, some of the waste gas treatment equipment has insufficient gas-liquid contact and low absorption efficiency, resulting in incomplete purification of formaldehyde waste gas, causing secondary pollution and failing to meet environmental emission requirements. Summary of the Invention

[0004] The purpose of this invention is to provide a tail gas absorption tower for formaldehyde waste gas treatment, so as to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the technical solution of the present invention is: a tail gas absorption tower for formaldehyde waste gas treatment, comprising a tower body and a gas outlet pipe fixedly installed above the tower body, an inlet pipe provided on one side of the tower body, a drain pipe provided below the outer side of the tower body, an air intake mechanism provided below the inner lower part of the tower body, the air intake mechanism including a connecting component provided below the inner lower part of the tower body, a fixing component provided below the connecting component, multiple sets of mounting components provided below the fixing component, a rotating component provided below the mounting component, and an exhaust fan provided inside the connecting component;

[0006] The connecting assembly includes a connecting pipe located at the lower part of the tower body. One end of the connecting pipe is fixedly connected to a U-shaped pipe. The U-shaped pipe consists of two vertical pipes and a bend. The connecting pipe is connected to one of the vertical pipes on the U-shaped pipe. One end of the other vertical pipe on the U-shaped pipe is fixedly connected to an inverted J-shaped bend. The lower end of the inverted J-shaped bend is fixedly connected to an installation pipe. A tapered pipe is fixedly connected inside the connecting pipe. The tapered pipe is located on the side close to the U-shaped pipe. The lower end of the tapered pipe is fixedly connected to a connecting bend. A connecting disc is fixedly connected inside the U-shaped pipe.

[0007] Preferably, the connecting plate is located on the side near the inverted J-shaped bend, one end of the connecting bend is located below the connecting plate, the connecting plate has multiple sieve holes, a cleaning pipe is fixedly connected to the bottom of the U-shaped pipe, a switch valve is provided above the cleaning pipe, the cleaning pipe is connected to the lower part of the U-shaped pipe, the exhaust fan is located inside the inverted J-shaped bend, and the connecting pipe penetrates the tower body.

[0008] Preferably, the fixing assembly includes multiple long rods disposed below the mounting tube, the multiple long rods being of different lengths, and multiple short rods being fixedly connected between the multiple long rods. The overall shape of the long rods and short rods is disc-shaped, and each of the long rods and short rods has a venting groove, which is connected to each other. Multiple exhaust holes are provided below the multiple long rods.

[0009] Preferably, the mounting tube has through holes on its lower outer side corresponding to the long rod and the short rod. The long rod and the short rod are fixedly connected to the mounting tube through the through holes on its lower outer side. The long rod and the short rod inside the mounting tube have annular grooves corresponding to the inside of the mounting tube. The mounting tube is connected to the ventilation groove through the annular grooves.

[0010] Preferably, the mounting assembly includes a fixing ring fixedly connected to the lower end of the long rod, the fixing ring having an annular groove on its outer side, and the position of the fixing ring corresponding to the position of the vent hole.

[0011] Preferably, the rotating assembly includes a rotating ring rotatably connected to the outside of the fixed ring, a connecting ring fixedly connected inside the rotating ring, the connecting ring corresponding to the annular groove, the connecting ring being rotatably disposed in the annular groove, a mounting ring fixedly connected to the lower end of the rotating ring, and a plurality of oblique grooves provided on the mounting ring, each of the plurality of oblique grooves being fixedly connected to an exhaust pipe.

[0012] Preferably, multiple packing support plates are fixedly installed inside the tower body, and packing is installed above the packing support plates.

[0013] Preferably, two spraying assemblies are provided on one side of the inlet pipe, and the spraying assemblies are located inside the tower body, respectively above the two packing materials above.

[0014] Compared with the prior art, the technical solution of the present invention has the following advantages:

[0015] (1) The tower is equipped with connecting components, fixing components, mounting components and rotating components. Under the power of the conveying equipment, the waste gas is accelerated through the conical tube and then forced into the absorbent liquid at the bottom of the U-shaped tube through the connecting bend, forming large bubbles. Subsequently, these large bubbles are cut by the connecting disc with screen holes above as they rise due to buoyancy. This design breaks the single large bubble into countless small bubbles, which increases the total surface area of ​​the gas. According to the mass transfer theory, the contact surface area between the gas and liquid phases directly determines the mass transfer rate. The smaller the bubble, the larger the surface area, and the more formaldehyde molecules can contact and react with the absorbent liquid in a short time. Thus, efficient and rapid primary absorption and dust washing are completed in the U-shaped tube stage. The design of the rotating components further enhances the mass transfer process and solves the absorption problem. The issue of uniform liquid collection arises because the gas discharged from the fixed components enters the rotating device consisting of the exhaust pipe. When the gas is ejected from the obliquely set exhaust pipe, the resulting reaction force drives the entire mounting ring to rotate continuously. This makes the exhaust pipe act like a high-speed rotating agitator, creating strong turbulence and mixing in the liquid layer at the bottom of the tower. Compared with static rising bubble groups, the dynamic, rotating small bubble groups can more effectively tear and renew the stagnant liquid film at the gas-liquid interface, reducing mass transfer resistance and allowing formaldehyde molecules to diffuse more quickly into the liquid phase. The stirring effect prevents the absorption liquid from forming concentration stratification or local saturation at the bottom of the tower, ensuring that the concentration of the absorption liquid at the bottom of the entire tower tends to be uniform, thereby maintaining the high efficiency of the bottom area for the absorption of waste gas and preventing the overall efficiency decline due to local failure.

[0016] (2) The U-shaped tube, as a liquid seal and primary purification component, has trapped most of the dust in the exhaust gas in the absorbent liquid at its bottom, preventing the dust from directly entering the main body of the tower and the packing layer. This is the first purification process. A cleaning pipe and a switch valve are installed on one side of the U-shaped tube. As the operating time accumulates, dust and impurities will accumulate at the bottom of the bend of the U-shaped tube, and some may even block the screen holes on the connecting plate. When traditional equipment encounters such problems, it often needs to stop the machine and disassemble some pipelines or components for cleaning, which is time-consuming and labor-intensive. However, this device only needs to shut down the system. By opening the valve on the cleaning pipe, the waste liquid containing deposited dirt can be discharged first. Then, the operator can easily connect the high-pressure water gun or cleaning fluid pipeline to the cleaning pipe and inject high-pressure fluid into the U-shaped pipe in the reverse direction. The powerful flushing of the high-pressure water flow can effectively clean the inner wall of the U-shaped pipe, the bends, and every sieve hole on the connecting plate, loosening and suspending stubborn deposits and carrying them out with the subsequent drainage. Through several cycles of "flushing-draining", the U-shaped pipe can be completely restored to unobstructed flow. The whole process is quick, safe, and simplifies the maintenance process. Attached Figure Description

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

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

[0019] Figure 3 This is a schematic diagram of the connection component structure of the present invention;

[0020] Figure 4 This is a schematic diagram of the internal structure of the connection component of the present invention;

[0021] Figure 5 This is a schematic diagram of the fixed component structure of the present invention;

[0022] Figure 6 This is a schematic diagram of the fixed component flipping structure of the present invention;

[0023] Figure 7 This is a schematic diagram of the fixing component and the mounting component of the present invention;

[0024] Figure 8 This is a schematic diagram of the installation component structure of the present invention;

[0025] Figure 9 This is a schematic diagram of the rotating component structure of the present invention;

[0026] Figure 10 This is a schematic diagram of the internal structure of the tower body of the present invention.

[0027] In the diagram: 1. Tower body; 11. Packing support plate; 111. Packing; 2. Gas outlet pipe; 3. Liquid inlet pipe; 31. Liquid spraying assembly; 4. Liquid drain pipe; 5. Air inlet mechanism; 51. Connecting assembly; 511. Connecting pipe; 512. U-shaped pipe; 513. Inverted J-shaped bend; 514. Installation pipe; 515. Cleaning pipe; 516. Conical pipe; 517. Connecting bend; 518. Connecting plate; 519. Sieve hole; 52. Fixing assembly; 521. Long rod; 522. Short rod; 523. Ventilation groove; 524. Exhaust hole; 53. Exhaust fan; 54. Installation assembly; 541. Fixing ring; 542. Annular groove; 55. Rotating assembly; 551. Rotating ring; 552. Connecting ring; 553. Installation ring; 554. Angled groove; 555. Exhaust pipe. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0029] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms "comprising" or "including," and similar terms used in this disclosure, mean that an element or object preceding the term encompasses the elements or objects listed following the term and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but may also include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; these relative positional relationships may change accordingly when the absolute position of the described objects changes.

[0030] like Figures 1 to 10 As shown, the present invention provides a tail gas absorption tower for formaldehyde waste gas treatment, including a tower body 1 and a gas outlet pipe 2 fixedly installed above the tower body 1. A liquid inlet pipe 3 is provided on one side of the tower body 1, and a liquid outlet pipe 4 is provided below the outer side of the tower body 1. An air inlet mechanism 5 is provided below the inner side of the tower body 1. The air inlet mechanism 5 includes a connecting component 51 provided below the inner side of the tower body 1. A fixing component 52 is provided below the connecting component 51. Multiple sets of mounting components 54 are provided below the fixing component 52. A rotating component 55 is provided below the mounting component 54. An exhaust fan 53 is provided inside the connecting component 51.

[0031] The connecting assembly 51 includes a connecting pipe 511 disposed at the lower part of the tower body 1. One end of the connecting pipe 511 is used to connect to an external gas conveying device, and a U-shaped pipe 512 is fixedly connected to one end of the connecting pipe 511. The U-shaped pipe 512 consists of two vertical pipes and a bend. The connecting pipe 511 is connected to one of the vertical pipes on the U-shaped pipe 512. An inverted J-shaped bend 513 is fixedly connected to one end of the other vertical pipe on the U-shaped pipe 512. An installation pipe 514 is fixedly connected to the lower end of the inverted J-shaped bend 513. A tapered tube 516 is fixedly connected inside the connector 511. The tapered tube 516 is located on the side near the U-shaped tube 512. A connecting bend 517 is fixedly connected to the lower end of the tapered tube 516. A connecting disc 518 is fixedly connected inside the U-shaped tube 512. The connecting disc 518 is located on the side near the inverted J-shaped bend 513. One end of the connecting bend 517 is located below the connecting disc 518. The bend in the U-shaped tube 512 is filled with absorbent liquid, which submerges the connecting bend 517 and the connecting disc 518.

[0032] Multiple sieve holes 519 are provided on the connecting plate 518. A cleaning pipe 515 is fixedly connected to the bottom of the U-shaped tube 512. A switch valve is provided above the cleaning pipe 515. The cleaning pipe 515 is connected to the lower part of the U-shaped tube 512. The exhaust fan 53 is installed inside the inverted J-shaped bend 513. The connecting pipe 511 passes through the tower body 1.

[0033] The fixing component 52 includes multiple long rods 521 disposed below the mounting pipe 514. The multiple long rods 521 are of different lengths, and multiple short rods 522 are fixedly connected to each other. The overall shape of the long rods 521 and the short rods 522 is disc-shaped. Ventilation grooves 523 are opened in both the long rods 521 and the short rods 522, and the ventilation grooves 523 in the long rods 521 and the short rods 522 are all interconnected. Multiple exhaust holes 524 are opened below the multiple long rods 521. The absorbent liquid in the lower part of the tower body 1 submerges the fixing component 52.

[0034] The lower outer side of the mounting tube 514 has through holes corresponding to the long rod 521 and the short rod 522. The long rod 521 and the short rod 522 are fixedly connected to the mounting tube 514 through the through holes on the lower outer side of the mounting tube 514. The long rod 521 and the short rod 522 inside the mounting tube 514 have annular grooves corresponding to the inside of the mounting tube 514. The mounting tube 514 is connected to the ventilation groove 523 through the annular grooves.

[0035] The mounting assembly 54 includes a fixing ring 541 fixedly connected to the lower end of the long rod 521. The fixing ring 541 has an annular groove 542 on its outer side, and the position of the fixing ring 541 corresponds to the position of the vent 524.

[0036] The rotating assembly 55 includes a rotating ring 551 rotatably connected to the outside of the fixed ring 541. A connecting ring 552 is fixedly connected inside the rotating ring 551. The connecting ring 552 corresponds to the annular groove 542 and is rotatably disposed in the annular groove 542. A mounting ring 553 is fixedly connected to the lower end of the rotating ring 551. A plurality of inclined grooves 554 are provided on the mounting ring 553. An exhaust pipe 555 is fixedly connected to each of the plurality of inclined grooves 554.

[0037] Multiple packing support plates 11 are fixedly installed inside the tower body 1, and packing 111 is installed above the packing support plates 11.

[0038] Two spraying components 31 are provided on one side of the inlet pipe 3. The spraying components 31 are located inside the tower body 1 and are respectively located above the two packings 111. The inlet pipe 3 is connected to the liquid supply pump.

[0039] The working principle of this invention: Formaldehyde waste gas, transported by an external gas conveying device, first enters the connecting pipe 511 located below the tower body 1. When the waste gas flows through the conical pipe 516 inside the connecting pipe 511, it is accelerated due to the change in pipe diameter. The accelerated waste gas enters the bent section of the U-shaped pipe 512 through the connecting bend pipe 517. The U-shaped pipe cavity is filled with absorbent liquid, and the liquid level submerges the outlet of the connecting bend pipe 517 and the connecting plate 518 above it. The waste gas is forced to enter the liquid from the outlet of the connecting bend pipe 517, forming large bubbles. Under the action of buoyancy, the large bubbles move upward and collide with the connecting plate 518 which is covered with sieve holes 519. The connecting plate 518 acts as a sieve plate, cutting and breaking the rising large bubbles into countless small bubbles. This process increases the gas-liquid contact surface area, allowing the formaldehyde waste gas to fully contact the absorbent liquid. During this process, the dust in the waste gas settles into the absorbent liquid, and the dust in the formaldehyde waste gas is treated. The structure of the U-shaped pipe 512 forms a reliable liquid seal to prevent gas backflow.

[0040] After the first absorption and crushing, the gas passes through the sieve holes of the connecting plate 518 in the form of small bubbles. After collection, it passes through the inverted J-shaped bend 513 and enters the installation pipe 514 with the help of the exhaust fan 53. The gas then enters the fixed assembly 52, which is composed of a long rod 521 and a short rod 522, through the installation pipe 514. The fixed assembly 52 is submerged below the bottom liquid level of the tower. The purified gas in the U-shaped tube 512 is discharged through the exhaust hole 524 below the long rod 521 and enters the fixed ring 541. From the fixed ring 541, it enters the installation ring 553 and then is discharged from the exhaust pipe 555. Because the exhaust pipe 555 and the inclined groove 554 are both inclined, the reaction force of the discharged gas will push the installation ring 553 to rotate continuously. The rotating exhaust pipe 555 agitates the liquid layer at the bottom of the tower, making the concentration of the absorbent liquid at the bottom of the tower uniform and avoiding local saturation. The agitation breaks the stagnant liquid film at the gas-liquid interface, allowing fresh absorbent liquid to be continuously exposed to the incoming waste gas, so that the waste gas and absorbent liquid can have better contact.

[0041] The ventilation slots 523 inside the fixed component 52 are interconnected to form a gas distribution plate, which evenly distributes the gas to the bottom cross section of the tower. The evenly distributed gas flows upward and passes through the multiple layers of packing 111 in the tower. At the same time, fresh absorbent liquid is pumped to the top of the tower through the inlet pipe 3 and the spraying component 31 and sprayed downward to contact the rising gas in the countercurrent. On the surface of the packing, the liquid film is constantly formed and renewed, and a second deep mass transfer and absorption with the formaldehyde in the gas is carried out, which improves the purification efficiency. The gas purified by the packing layer continues to rise and is discharged from the gas outlet pipe 2.

[0042] After long-term operation, dust and other solids may accumulate at the bottom of the U-tube 512. In this case, the system can be shut down, the switch valve on the cleaning pipe 515 at the bottom of the U-tube can be opened, the sewage containing the sediment can be discharged first, and high-pressure water or cleaning fluid can be injected into the U-tube 512 from the cleaning pipe 515 in reverse to forcefully flush the inside of the U-tube 512 and the sieve holes 519 on the connecting plate 518 to suspend the sediment. Then the turbid water can be discharged. Repeating this process several times can effectively clean the blockage without disassembling the equipment.

[0043] The above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the present invention. The scope of protection of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to the present invention within its spirit and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of the present invention.

Claims

1. A tail gas absorption tower for formaldehyde waste gas treatment, comprising a tower body (1) and a gas outlet pipe (2) fixedly disposed above the tower body (1), wherein a liquid inlet pipe (3) is disposed on one side of the tower body (1), a liquid outlet pipe (4) is disposed below the outer side of the tower body (1), and an air inlet mechanism (5) is disposed below the interior of the tower body (1), characterized in that: The air intake mechanism (5) includes a connecting component (51) disposed inside the lower part of the tower body (1), a fixing component (52) disposed below the connecting component (51), a plurality of mounting components (54) disposed below the fixing component (52), a rotating component (55) disposed below the mounting component (54), and an exhaust fan (53) disposed inside the connecting component (51). The connecting assembly (51) includes a connecting pipe (511) disposed inside the lower part of the tower body (1). One end of the connecting pipe (511) is fixedly connected to a U-shaped pipe (512). The U-shaped pipe (512) is composed of two vertical pipes and a bend. The connecting pipe (511) is connected to one of the vertical pipes on the U-shaped pipe (512). One end of the other vertical pipe on the U-shaped pipe (512) is fixedly connected to an inverted J-shaped bend (513). The lower end of the inverted J-shaped bend (513) is fixedly connected to an installation pipe (514). A tapered pipe (516) is fixedly connected inside the connecting pipe (511). The tapered pipe (516) is disposed on the side close to the U-shaped pipe (512). The lower end of the tapered pipe (516) is fixedly connected to a connecting bend (517). A connecting disc (518) is fixedly connected inside the U-shaped pipe (512). The connecting plate (518) is located on one side near the inverted J-shaped bend (513), and one end of the connecting bend (517) is located below the connecting plate (518). The connecting plate (518) has multiple sieve holes (519). The fixing component (52) includes a plurality of long rods (521) disposed below the mounting tube (514). The plurality of long rods (521) are of different lengths, and a plurality of short rods (522) are fixedly connected to the plurality of long rods (521). The overall shape of the long rods (521) and the short rods (522) is disc-shaped. Ventilation grooves (523) are provided in both the long rods (521) and the short rods (522). The ventilation grooves (523) in the long rods (521) and the short rods (522) are all interconnected. A plurality of exhaust holes (524) are provided below the plurality of long rods (521). The mounting assembly (54) includes a fixing ring (541) fixedly connected to the lower end of the long rod (521). The fixing ring (541) has an annular groove (542) on its outer side. The position of the fixing ring (541) corresponds to the position of the vent hole (524). The rotating assembly (55) includes a rotating ring (551) rotatably connected to the outside of the fixed ring (541). A connecting ring (552) is fixedly connected inside the rotating ring (551). The connecting ring (552) corresponds to the annular groove (542) and is rotatably disposed in the annular groove (542). An installation ring (553) is fixedly connected to the lower end of the rotating ring (551). A plurality of oblique grooves (554) are provided on the installation ring (553). An exhaust pipe (555) is fixedly connected to each of the plurality of oblique grooves (554).

2. The tail gas absorption tower for formaldehyde waste gas treatment according to claim 1, characterized in that: A cleaning pipe (515) is fixedly connected below the U-shaped pipe (512), and a switch valve is provided above the cleaning pipe (515). The cleaning pipe (515) is connected to the lower part of the U-shaped pipe (512). The exhaust fan (53) is located inside the inverted J-shaped bend (513). The connecting pipe (511) passes through the tower body (1).

3. The tail gas absorption tower for formaldehyde waste gas treatment according to claim 2, characterized in that: The mounting tube (514) has through holes on its lower outer side corresponding to the long rod (521) and the short rod (522). The long rod (521) and the short rod (522) are fixedly connected to the mounting tube (514) through the through holes on its lower outer side. The long rod (521) and the short rod (522) inside the mounting tube (514) have annular grooves corresponding to the inside of the mounting tube (514). The mounting tube (514) is connected to the ventilation groove (523) through the annular grooves.

4. The tail gas absorption tower for formaldehyde waste gas treatment according to claim 1, characterized in that: Multiple packing support plates (11) are fixedly installed inside the tower body (1), and packing (111) is installed above the packing support plates (11).

5. The tail gas absorption tower for formaldehyde waste gas treatment according to claim 4, characterized in that: Two spraying assemblies (31) are provided on one side of the liquid inlet pipe (3). The spraying assemblies (31) are located inside the tower body (1) and are respectively located above the two packing materials (111).

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