High-efficiency formaldehyde-removing harmful gas purification equipment in formaldehyde production line

Abstract

The present application relates to the field of air purification, especially to a harmful gas purification equipment with high-efficiency formaldehyde removal in a formaldehyde production line, comprising a tower body, a gas input pipe arranged at the bottom of the tower body, a liquid delivery assembly arranged on the tower body, an exhaust pipe arranged at the top of the tower body, a liquid discharge pipe arranged at the bottom of the tower body, and a spiral flow guide absorption unit arranged on the tower body, the present application uniformly disperses the central high-speed airflow to the periphery through the cooperation of the fixing block and the central flow guide cone, then makes the formaldehyde-containing gas enter the tower body through the air inlet channel to form a rotating upward airflow, thereby improving the uniformity of airflow velocity distribution on the cross section of the tower body and making the gas-liquid contact in each region of the packing chamber more sufficient, and the spiral direction of the packing spiral support plate is opposite to the rotating direction of the airflow generated by the air inlet channel, so that the liquid is continuously guided to the central region of the tower body when flowing downward along the packing, thereby prolonging the residence time of the liquid in the packing layer and increasing the gas-liquid mass transfer time.

Description

Technical Field

[0001] This invention relates to the field of air purification, and in particular to a highly efficient formaldehyde removal and harmful gas purification device for formaldehyde production lines. Background Technology

[0002] Formaldehyde is an important basic chemical raw material, widely used in resins, coatings, adhesives, textile auxiliaries, and other fields. During formaldehyde production, oxidation reactions and absorption processes generate large amounts of harmful formaldehyde-containing gases. Direct emission of these gases would pose serious threats to the environment and human health. Currently, packed absorption towers are commonly used in formaldehyde production lines to absorb and purify these harmful gases. Their working principle utilizes the water-soluble nature of formaldehyde, employing a countercurrent mass transfer process between the sprayed liquid and the formaldehyde-containing waste gas within the packed layer, allowing the formaldehyde to be absorbed by the water.

[0003] Packed absorption towers typically use simple gas inlet pipes for direct gas intake. Formaldehyde gas, once inside the tower, cannot be evenly distributed, easily forming a high-speed airflow channel in the central area while creating dead zones near the tower walls. This results in insufficient gas-liquid contact in parts of the packing layer, leading to low absorption efficiency. Large amounts of formaldehyde gas are discharged without being fully absorbed, causing environmental pollution and raw material waste. Furthermore, during operation, as the spray liquid flows downwards along the packing layer, it gradually migrates towards the tower wall due to surface tension and gravity, creating a "wall flow effect." This causes the liquid film in the central area of ​​the packing layer to thin or even dry out, while the liquid film near the tower wall becomes too thick. The gas-liquid two-phase distribution within the packing layer is severely uneven, significantly reducing mass transfer efficiency. To mitigate the wall flow effect and prevent uneven distribution of the spray liquid within the packing layer, segmented packing with a liquid redistributor is typically used. However, the redistributor has a complex structure, is prone to clogging, and increases equipment height and pressure drop. Summary of the Invention

[0004] Given that the above-mentioned or existing technologies have problems such as the inability of formaldehyde gas to be evenly distributed after entering the tower, which easily forms a high-speed airflow channel in the central area of ​​the tower, while dead airflow zones appear near the tower wall, this leads to insufficient gas-liquid contact in some areas of the packing layer, resulting in low absorption efficiency. A large amount of formaldehyde gas is discharged without being fully absorbed, causing environmental pollution and waste of raw materials. Moreover, during the operation of the packed absorption tower, when the spray liquid flows downward along the packing layer, it gradually migrates towards the tower wall due to the surface tension and gravity of the liquid, forming a "wall flow effect". This causes the liquid film in the central area of ​​the packing layer to become thin or even dry up, while the liquid film near the tower wall is too thick. The distribution of the gas and liquid phases in the packing layer is severely uneven, and the mass transfer efficiency drops significantly. To alleviate the wall flow effect and prevent the uneven distribution of the spray liquid in the packing layer caused by the wall flow effect, segmented packing and liquid redistributors are usually used. However, the redistributors have a complex structure, are prone to clogging, and increase the equipment height and pressure drop. Therefore, this invention is proposed.

[0005] Therefore, the purpose of this invention is to provide a highly efficient formaldehyde removal and harmful gas purification device for formaldehyde production lines.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a high-efficiency formaldehyde removal harmful gas purification device in a formaldehyde production line, comprising a tower body, a gas input pipe disposed at the bottom of the tower body, a liquid delivery assembly disposed on the tower body, an exhaust pipe disposed at the top of the tower body, a drain pipe disposed at the bottom of the tower body, and a spiral flow guiding absorption unit disposed on the tower body; the gas input pipe includes an inlet pipe disposed on the tower body, one end of which penetrates through the outer wall of the tower body to the inner cavity of the tower body, an annular conduit disposed at one end of the inlet pipe in the tower body, and a swirl distribution assembly disposed above the outlet of the annular conduit; the spiral flow guiding absorption unit includes multiple sets of packing support plates disposed on the tower body, a packing spiral support plate disposed on the packing support plates, and a liquid redistribution assembly disposed between two adjacent sets of packing support plates; the space enclosed by the spiral spacing on the packing spiral support plate is configured as a packing cavity, and a regular packing is placed on the packing cavity.

[0007] As a preferred embodiment of the formaldehyde production line of the present invention, the swirl distribution component includes an annular guide groove disposed above the annular guide tube, a fixed block disposed between the annular guide groove and the inner wall of the tower body, a central guide cone disposed at the bottom of the fixed block, an air inlet channel disposed on the fixed block and communicating with the annular guide groove, and a central diversion guide cone disposed on the annular guide groove for cooperating with the packing spiral support plate.

[0008] As a preferred embodiment of the formaldehyde production line purification equipment for efficient formaldehyde removal, the output port of the annular conduit is directly opposite the bottom of the central guide cone.

[0009] As a preferred embodiment of the formaldehyde production line of the present invention, the air inlet channel is set to be inclined relative to the fixed block, and the straight line of the output direction of the air inlet channel port is tangent to the cross section of the annular guide groove.

[0010] As a preferred embodiment of the formaldehyde production line high-efficiency formaldehyde removal harmful gas purification equipment of the present invention, wherein: in the working state, the gas generates a spiral airflow through the air inlet channel toward the packing support plate; Ventilation holes are provided on the packing support plate and the packing spiral support plate.

[0011] As a preferred embodiment of the formaldehyde production line high-efficiency formaldehyde removal and harmful gas purification equipment of the present invention, wherein the spiral direction of the packing spiral support plate is opposite to the spiral airflow direction.

[0012] As a preferred embodiment of the formaldehyde production line of the present invention, the formaldehyde removal and harmful gas purification equipment includes a liquid redistribution component comprising a liquid collection tray disposed on the tower body, a downcomer disposed on the liquid collection tray, and a flow guide cone disposed below the downcomer, wherein there is a certain distance between the downcomer and the flow guide cone.

[0013] As a preferred embodiment of the formaldehyde production line of the present invention, the formaldehyde removal equipment for harmful gas purification includes: a circulation pipe at the bottom of the tower, a circulation pump on the circulation pipe, a return pipe connected at one end to the circulation pump and at the other end to the upper part of the tower, and an aeration component above the uppermost packing spiral support plate. The aeration unit is connected to the return liquid pipe.

[0014] As a preferred embodiment of the formaldehyde production line of the present invention, the formaldehyde removal and harmful gas purification equipment includes: a microporous aeration plate disposed above the uppermost packing spiral support plate, an annular main pipe disposed above the microporous aeration plate, a spray branch pipe disposed on the annular main pipe, and spiral nozzles disposed on the annular main pipe and the spray branch pipe.

[0015] As a preferred embodiment of the formaldehyde production line purification equipment for efficient formaldehyde removal of harmful gases in this invention, the tower body is provided with a maintenance manhole, which is set according to the position of the spiral support plate of each stage of packing; a condensation recovery demister is provided above the annular main pipe, and an activated carbon adsorption layer is provided above the condensation recovery demister; the activated carbon adsorption layer includes a fixed frame set on the inner wall of the tower body, and a drawer-type activated carbon adsorption frame slidably set on the fixed frame.

[0016] The beneficial effects of the formaldehyde removal and harmful gas purification equipment in the formaldehyde production line of the present invention are as follows: The present invention uses the cooperation of a fixed block and a central guide cone to evenly disperse the high-speed airflow in the center to the surrounding area. Then, after the formaldehyde-containing gas enters the tower body through the air inlet channel, it forms a rotating upward airflow, which improves the uniformity of airflow velocity distribution on the cross-section of the tower body, eliminates channeling and dead zones, and makes the gas-liquid contact in each area of ​​the packing cavity more sufficient, creating the preconditions for efficient absorption. Furthermore, by placing regular packing on the packing spiral support plate, and by using the spiral direction of the packing spiral support plate to be opposite to the rotation direction of the airflow generated by the air inlet channel, this reverse spiral structure causes the liquid to be guided by a spiral flow opposite to the wall flow direction when flowing downward along the packing. The liquid is continuously guided towards the central area of ​​the tower body, inhibiting the liquid from migrating to the inner wall of the tower body. At the same time, the spiral helix angle design of the packing spiral support plate extends the residence time of the liquid in the packing layer, increases the gas-liquid mass transfer time, makes the overall structure simpler, and suppresses the wall flow inhibition effect, thereby improving the mass transfer efficiency.

[0017] By setting a microporous aeration plate above the top-level packing spiral support plate, formaldehyde-containing gas is broken into a large number of tiny bubbles when passing through the densely packed micropores of the microporous aeration plate, increasing the gas-liquid contact area. Combined with the large number of tiny bubbles generated by microporous aeration, even low concentrations of formaldehyde gas can be fully absorbed, improving the formaldehyde removal rate. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of a formaldehyde removal and harmful gas purification device in a formaldehyde production line.

[0020] Figure 2 This is a schematic diagram of the internal structure of a high-efficiency formaldehyde removal and harmful gas purification device in a formaldehyde production line.

[0021] Figure 3 A schematic diagram of the swirl distribution component of a high-efficiency formaldehyde removal and harmful gas purification device in a formaldehyde production line.

[0022] Figure 4 This is a schematic cross-sectional view of the annular guide channel of a formaldehyde removal and purification device for highly efficient formaldehyde removal in a formaldehyde production line.

[0023] Figure 5 A schematic diagram of the packing spiral support plate for a high-efficiency formaldehyde removal and harmful gas purification device in a formaldehyde production line.

[0024] Figure 6 A schematic diagram of the liquid collection tray of a high-efficiency formaldehyde removal and harmful gas purification device in a formaldehyde production line.

[0025] Figure 7 This is a schematic diagram of the aeration component of a formaldehyde removal and harmful gas purification device used in a formaldehyde production line.

[0026] In the diagram: 1. Tower body; 11. Inspection manhole; 12. Condensation recovery demister; 13. Activated carbon adsorption layer; 131. Fixing frame; 132. Drawer-type activated carbon adsorption frame; 2. Gas input pipe; 21. Inlet pipe; 22. Annular guide pipe; 23. Swirl distribution assembly; 231. Annular guide groove; 232. Fixing block; 233. Central guide cone; 234. Inlet channel; 235. Central diversion guide cone; 3. Liquid delivery assembly; 31 31. Circulation pipe; 32. Circulation pump; 33. Return pipe; 34. Aeration assembly; 341. Microporous aeration plate; 342. Annular main pipe; 343. Spray branch pipe; 344. Spiral nozzle; 4. Exhaust pipe; 5. Drain pipe; 6. Spiral guide absorption unit; 61. Packing support plate; 62. Packing spiral support plate; 63. Liquid redistribution assembly; 631. Collection tray; 632. Downcomer hole; 633. Guide cone cap; 64. Packing chamber. Detailed Implementation

[0027] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0028] Example, refer to Figures 1 to 7 As one embodiment of the present invention, this embodiment provides a high-efficiency formaldehyde removal and harmful gas purification device for a formaldehyde production line, comprising a tower body 1, a gas input pipe 2 disposed at the bottom of the tower body 1, a liquid delivery assembly 3 disposed on the tower body 1, an exhaust pipe 4 disposed at the top of the tower body 1, a drain pipe 5 disposed at the bottom of the tower body 1, and a spiral guide absorption unit 6 disposed on the tower body 1; wherein, the tower body 1 serves as the site for absorbing formaldehyde from harmful gases, the gas input pipe 2 is used to introduce formaldehyde-containing harmful gases into the tower body 1, and to uniformly disperse the airflow entering the tower body 1. Liquid component 3 is used to circulate the formaldehyde-absorbing solution in tower body 1 to ensure full contact between gas and liquid. Exhaust pipe 4 is used to discharge the formaldehyde-removed gas. An online formaldehyde concentration monitor is installed at exhaust pipe 4. The exhaust pipe 4 will only open to discharge the gas when the formaldehyde content in the gas is detected to be lower than the set value. The online formaldehyde concentration monitor is correlated with the gas input speed of gas input pipe 2 to maintain a dynamic balance between the gas intake speed and the gas emission speed that meets the standards. Liquid drain pipe 5 is used to discharge the absorbent liquid that has fully absorbed formaldehyde. Spiral guide absorption unit 6 is used to ensure full contact between the gas flow and the absorbent liquid.

[0029] The gas input pipe 2 includes an inlet pipe 21 disposed on the tower body 1, one end of which penetrates the outer wall of the tower body 1 to the inner cavity of the tower body 1; an annular conduit 22 disposed on one end of the inlet pipe 21 in the tower body 1; and a swirl distribution component 23 disposed above the outlet of the annular conduit 22. The inlet pipe 21 is used to connect the formaldehyde-containing harmful gas and guide the gas to the bottom of the tower body 1. The annular conduit 22 is used to guide the gas entering the tower body 1. The swirl distribution component 23 is used to evenly distribute the gas output from the annular conduit 22 to the surrounding inner wall of the tower body 1.

[0030] The spiral flow absorption unit 6 includes multiple sets of packing support plates 61 disposed on the tower body 1, packing spiral support plates 62 disposed on the packing support plates 61, and liquid redistribution components 63 disposed between two adjacent sets of packing support plates 61. The packing support plates 61 provide support, the packing spiral support plates 62 cooperate with the packing support plates 61 to support the packing, and the packing spiral support plates 62 guide the falling absorbent liquid to prevent the absorbent liquid from flowing to the inner wall of the tower body 1. The liquid redistribution components 63 receive the absorbent liquid falling from the upper packing support plates 61, collect it, and spray it evenly to the lower packing spiral support plates 62.

[0031] The space enclosed by the spiral spacing on the packing spiral support plate 62 is set as the packing cavity 64. The packing cavity 64 is used to place the packing. The packing cavity 64 is filled with structured packing. The structured packing is metal perforated plate corrugated packing. The surface of the metal perforated plate corrugated packing is smooth and it is not easy for polyoxymethylene to adhere.

[0032] The swirl distribution component 23 includes an annular guide groove 231 disposed above the annular guide duct 22, a fixing block 232 disposed between the annular guide groove 231 and the inner wall of the tower body 1, a central guide cone 233 disposed at the bottom of the fixing block 232, an air inlet channel 234 disposed on the fixing block 232 and communicating with the annular guide groove 231, and a central diversion guide cone 235 disposed on the annular guide groove 231 for cooperating with the packing spiral support plate 62; wherein, the annular guide groove 231... The outer diameter is smaller than the inner diameter of the tower body 1. The annular guide groove 231 is used to guide the rising airflow. The fixing block 232 serves to connect and fix the annular guide groove 231. The central guide cone 233 is used to disperse the airflow output from the annular duct 22 to the surrounding area. The air inlet channel 234 is used to transport the dispersed airflow along the inner wall of the tower body 1 towards the packing spiral support plate 62. The central diversion guide cone 235 is used to guide the dripping absorbent liquid and prevent the absorbent liquid from accumulating and remaining on the top of the annular guide groove 231.

[0033] The outlet of the annular duct 22 is directly opposite the bottom of the central guide cone 233. In this way, the airflow output from the annular duct 22 directly impacts the end of the central guide cone 233, causing the airflow to be evenly dispersed in all directions and enter the annular guide groove 231. Finally, it is output to the packing spiral support plate 62 through the air inlet channel 234.

[0034] The air intake channel 234 is set to be inclined relative to the fixed block 232, and the straight line of the output direction of the air intake channel 234 is tangent to the cross section of the annular guide groove 231. In this way, the gas passes through the air intake channel 234 and forms a spiral airflow along the inner wall of the tower body 1.

[0035] In the working state, the gas generates a spiral airflow towards the packing support plate 61 through the air inlet channel 234. The packing support plate 61 and the packing spiral support plate 62 are provided with vent holes, and the airflow passes evenly through the packing in the packing cavity 64 through the vent holes.

[0036] In this design, the spiral direction of the packing spiral support plate 62 is opposite to the spiral airflow direction. In this way, because the spiral direction of the packing spiral support plate 62 is opposite to the rotation direction of the airflow, the absorbent liquid is guided by the reverse spiral flow during the downward flow process and is continuously guided towards the central area of ​​the tower body 1. While suppressing the wall flow effect, the spiral flow guiding structure of the packing spiral support plate 62 makes the liquid flow velocity on the packing surface moderate, and it is not easy to form a local high concentration area. The regularized packing and spiral structure prolong the gas-liquid contact time, so that the absorbent liquid can efficiently absorb formaldehyde in the airflow.

[0037] The liquid redistribution component 63 includes a collection tray 631 mounted on the tower body 1, a downcomer hole 632 mounted on the collection tray 631, and a guide cone cap 633 positioned below the downcomer hole 632. A certain distance exists between the downcomer hole 632 and the guide cone cap 633. The collection tray 631 receives the absorbent liquid falling from the upper packing support plate 61. After flowing out of the downcomer hole 632, the absorbent liquid impacts the surface of the guide cone cap 633 and is evenly dispersed into an umbrella-shaped liquid curtain along the conical surface of the guide cone cap 633, before falling into the next stage packing cavity 64. In the central area, paraformaldehyde white solid particles are generated during formaldehyde absorption. These particles easily flow with the liquid and adhere to the edge of the downcomer 632, gradually clogging the downcomer 632. The guide cone 633 is located below the downcomer 632, forming a physical barrier to prevent the rising dust-laden gas from directly flushing the downcomer 632, reducing particle deposition at the orifice of the downcomer 632. At the same time, the absorbent film flowing down along the guide cone 633 continuously flushes the surface of the guide cone 633 and the area below the downcomer 632, playing a self-cleaning role and reducing the probability of clogging.

[0038] The infusion assembly 3 includes a circulation pipe 31 located at the bottom of the tower body 1, a circulation pump 32 located on the circulation pipe 31, a return pipe 33 connected at one end to the circulation pump 32 and at the other end to the upper part of the tower body 1, and an aeration assembly 34 located above the uppermost packing spiral support plate 62. The circulation pipe 31 is used to work with the circulation pump 32 to draw up the absorbent that falls to the bottom, and then transport it to the aeration assembly 34 through the return pipe 33 for circulation absorption. A liquid level sensor, a formaldehyde concentration sensor and a pH sensor are installed on the inner wall at the bottom of the tower body 1. The formaldehyde concentration sensor is used to monitor the formaldehyde concentration in the circulating absorbent in real time. When the concentration reaches a set threshold, the drain pipe 5 is automatically triggered to discharge part of the absorbent and replenish fresh absorbent.

[0039] The aeration component 34 is connected to the return liquid pipe 33. The aeration component 34 is used to divide the incoming gas into a large number of microbubbles and spray the absorbent liquid delivered by the return liquid pipe 33 in a scattered manner, so that the aldehyde-containing gas and the absorbent liquid can come into full contact.

[0040] The aeration assembly 34 includes a microporous aeration plate 341 disposed above the uppermost packing spiral support plate 62, an annular main pipe 342 disposed above the microporous aeration plate 341, a spray branch pipe 343 disposed on the annular main pipe 342, and spiral nozzles 344 disposed on the annular main pipe 342 and the spray branch pipe 343. The microporous aeration plate 341 is used to divide the formaldehyde-containing gas passing through into a large number of tiny bubbles. The annular main pipe 342, together with the spray branch pipe 343, evenly disperses the absorbent liquid delivered from the return pipe 33 to the spiral nozzles 344. Due to the large spray angle and high spray coverage of the spiral nozzles 344, the large number of tiny bubbles generated by the microporous aeration of the microporous aeration plate 341 ensures that even low concentrations of formaldehyde gas can be fully absorbed.

[0041] The tower body 1 is equipped with a maintenance manhole 11, which is set according to the position of the spiral support plate 62 of each stage of packing. This arrangement facilitates the maintenance and inspection of the equipment.

[0042] A condensation recovery demister 12 is installed above the annular main pipe 342, and an activated carbon adsorption layer 13 is installed above the condensation recovery demister 12. The condensation recovery demister 12 includes a condensation coil installed on the tower body 1 and a baffle plate demister installed below the condensation coil. The condensation coil is used to reduce the gas temperature below the dew point, so that the residual formaldehyde vapor is condensed into liquid for recovery. The baffle plate demister is used to remove liquid droplets entrained in the gas, so that the liquid drips back into the packing. The condensation coil and the baffle plate demister are existing technologies, and the specific structure can be referred to the existing technology, which will not be described in detail here. The activated carbon adsorption layer 13 is used to deeply adsorb trace amounts of residual formaldehyde in the gas, ensuring that the formaldehyde concentration in the emitted gas meets the specified requirements.

[0043] The activated carbon adsorption layer 13 includes a fixing frame 131 disposed on the inner wall of the tower body 1, and a drawer-type activated carbon adsorption frame 132 slidably disposed on the fixing frame 131. The drawer-type activated carbon adsorption frame 132 is filled with modified activated carbon particles, the surface of which is coated with calcium oxide for absorbing residual formaldehyde in the passing gas. The drawer-type activated carbon adsorption frame 132 can be quickly pulled out or inserted into the tower body 1 with the cooperation of the fixing frame 131, which facilitates the inspection or replacement of the modified activated carbon particles in the drawer-type activated carbon adsorption frame 132.

[0044] In summary, formaldehyde-containing harmful gas enters the tower body 1 through the inlet pipe 21. First, the annular conduit 22 outputs the gas to the end of the central guide cone 233, causing the gas flow to disperse into the annular guide groove 231. Under the action of the inlet channel 234, the gas forms a rotating upward airflow and is evenly distributed on the inner wall of the tower body 1. At this time, the airflow enters the packing spiral support plate 62 upward, and in the packing cavity 64, it undergoes countercurrent contact mass transfer with the absorbent flowing downward. Since the spiral direction of the packing spiral support plate 62 is opposite to the rotation direction of the airflow, the liquid is guided by the reverse spiral flow during the downward flow and is continuously guided towards the central area of ​​the tower body 1. At the same time, the combination of regulated packing and spiral structure prolongs the gas-liquid contact time. The process involves allowing the absorbent liquid to fully absorb formaldehyde. After absorption by the spiral guide, the gas continues to rise and enters the microporous aeration plate 341. As the gas passes through the microporous aeration plate 341, it is broken into numerous tiny bubbles, which come into full contact with the absorbent liquid sprayed from the spiral nozzle 344, further removing residual low-concentration formaldehyde. Subsequently, the gas enters the condensation recovery demister 12, where the condensation coil lowers the gas temperature below the dew point, causing residual formaldehyde vapor to condense into liquid for recovery. The baffle plate demister removes entrained droplets from the gas, which fall into the packing material under gravity. Finally, the gas passes through the drawer-type activated carbon adsorption frame 132, where modified activated carbon particles deeply adsorb trace amounts of residual formaldehyde, ensuring that the formaldehyde concentration in the emitted gas meets emission standards.

[0045] The absorbent liquid is collected at the bottom of the tower body 1 by the bottom packing spiral support plate 62 and the central diversion guide cone 235. After being pressurized by the circulation pump 32, it is transported to the spiral nozzle 344 for recycling. The sensor at the bottom of the tower body 1 monitors the state of the absorbent liquid in real time and intelligently controls the discharge and replenishment of the liquid to ensure that the absorbent liquid is always in the best absorption state.

[0046] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A high-efficiency formaldehyde removal and harmful gas purification device for formaldehyde production lines, characterized in that: It includes a tower body (1), a gas input pipe (2) located at the bottom of the tower body (1), a liquid delivery assembly (3) located on the tower body (1), an exhaust pipe (4) located at the top of the tower body (1), a drain pipe (5) located at the bottom of the tower body (1), and a spiral guide absorption unit (6) located on the tower body (1). The gas input pipe (2) includes an inlet pipe (21) disposed on the tower body (1), one end of the inlet pipe (21) penetrates the outer wall of the tower body (1) to the inner cavity of the tower body (1), an annular conduit (22) disposed on one end of the inlet pipe (21) in the tower body (1), and a swirl distribution component (23) disposed above the outlet of the annular conduit (22). The spiral flow absorption unit (6) includes multiple sets of packing support plates (61) disposed on the tower body (1), a packing spiral support plate (62) disposed on the packing support plate (61), and a liquid redistribution assembly (63) disposed between two adjacent sets of packing support plates (61). The space enclosed by the helical spacing on the packing helical support plate (62) is set as the packing cavity (64), and a regular packing is placed on the packing cavity (64).

2. The formaldehyde removal and harmful gas purification equipment in a formaldehyde production line as described in claim 1, characterized in that: The swirl distribution assembly (23) includes an annular guide groove (231) disposed above the annular guide duct (22), a fixing block (232) disposed between the annular guide groove (231) and the inner wall of the tower body (1), a central guide cone (233) disposed at the bottom of the fixing block (232), an air intake channel (234) disposed on the fixing block (232) and communicating with the annular guide groove (231), and a central diversion guide cone (235) disposed on the annular guide groove (231) for cooperating with the packing spiral support plate (62).

3. The formaldehyde removal and harmful gas purification equipment in a formaldehyde production line as described in claim 2, characterized in that: The outlet of the annular conduit (22) is directly opposite the bottom of the central guide cone (233).

4. The formaldehyde removal and harmful gas purification equipment in a formaldehyde production line as described in claim 2, characterized in that: The intake channel (234) is set to an inclined state relative to the fixed block (232), and the straight line of the output direction of the intake channel (234) port is tangent to the cross section of the annular guide groove (231).

5. The formaldehyde removal and harmful gas purification equipment in a formaldehyde production line as described in claim 4, characterized in that: In operation, the gas flows through the intake channel (234) toward the packing support plate (61) to generate a spiral airflow. Ventilation holes are provided on the packing support plate (61) and the packing spiral support plate (62).

6. The formaldehyde removal and harmful gas purification equipment in a formaldehyde production line as described in claim 5, characterized in that: The spiral direction of the packing spiral support plate (62) is opposite to the spiral airflow direction.

7. The formaldehyde removal and harmful gas purification equipment for a formaldehyde production line as described in claim 1, characterized in that: The liquid redistribution assembly (63) includes a liquid collection plate (631) disposed on the tower body (1), a downcomer hole (632) disposed on the liquid collection plate (631), and a flow guide cone (633) disposed below the downcomer hole (632). There is a certain distance between the downcomer hole (632) and the flow guide cone (633).

8. The formaldehyde removal and harmful gas purification equipment in a formaldehyde production line as described in claim 1, characterized in that: The infusion assembly (3) includes a circulation pipe (31) located at the bottom of the tower body (1), a circulation pump (32) located on the circulation pipe (31), a return pipe (33) connected at one end to the circulation pump (32) and at the other end to the upper part of the tower body (1), and an aeration assembly (34) located above the uppermost packing spiral support plate (62). The aeration component (34) is connected to the return pipe (33).

9. The formaldehyde removal and harmful gas purification equipment in a formaldehyde production line as described in claim 8, characterized in that: The aeration assembly (34) includes a microporous aeration plate (341) disposed above the uppermost packing spiral support plate (62), an annular main pipe (342) disposed above the microporous aeration plate (341), a spray branch pipe (343) disposed on the annular main pipe (342), and a spiral nozzle (344) disposed on the annular main pipe (342) and the spray branch pipe (343).

10. The formaldehyde removal and harmful gas purification equipment in a formaldehyde production line as described in claim 9, characterized in that: The tower body (1) is provided with a maintenance manhole (11), and the maintenance manhole (11) is set according to the position of the spiral support plate (62) of each stage of packing; A condensation recovery demister (12) is provided above the annular main pipe (342), and an activated carbon adsorption layer (13) is provided above the condensation recovery demister (12). The activated carbon adsorption layer (13) includes a fixed frame (131) disposed on the inner wall of the tower body (1) and a drawer-type activated carbon adsorption frame (132) slidably disposed on the fixed frame (131).

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