Tail gas treater for formaldehyde absorption process

Abstract

The invention provides a tail gas treatment device for a formaldehyde absorption process, and belongs to the technical field of tail gas treatment. Comprising a pretreatment tank and a treatment tower, a waste gas pipe is arranged between the pretreatment tank and the treatment tower, an isolation hood is arranged on the lower portion in the treatment tower, one end of the waste gas pipe extends to the inner side of the isolation hood, and a plurality of exhaust pipes are fixedly connected to the outer portion of the waste gas pipe and located on the inner side of the isolation hood at equal intervals; the spraying assembly comprises a water supply pipe fixed in the treatment tower, and a plurality of branch pipes are fixedly connected to the outer side of the water supply pipe at equal intervals. A water body is driven to rotate by utilizing kinetic energy of tail gas through the tangentially arranged exhaust pipe, a turbulent flow shearing field is generated, bubbles are refined to 2-3mm, then the bubbles are subjected to secondary cutting through the filter screen and further refined to below 1mm, the gas-liquid contact specific surface area is greatly increased compared with that of a traditional bubbling mode through two-stage physical cutting, and the gas-liquid separation efficiency is improved. The contact effect of the gas and the aqueous solution can be enhanced.

Description

Technical Field

[0001] This invention relates to the field of formaldehyde exhaust gas treatment technology, and in particular to an exhaust gas processor for formaldehyde absorption processes. Background Technology

[0002] Formaldehyde exhaust gas treatment is an important environmental protection step in industries such as chemical, wood processing, textile, and coating. In existing technologies, commonly used formaldehyde exhaust gas processors typically employ spray absorption towers. The basic working process is as follows: exhaust gas enters from the bottom of the tower, is pretreated in a water bath, and then rises to come into countercurrent contact with the absorbent liquid sprayed down from the top of the tower. Formaldehyde molecules are captured by the absorbent liquid, and the purified gas is discharged from the top of the tower. To improve the gas-liquid contact efficiency, some equipment sets up a packing layer inside the tower or uses a multi-stage spraying method to extend the contact path.

[0003] However, traditional water bath zones mostly use single-tube or multi-tube bubbling methods. The bubble generation method in the water bath zone is singular, relying solely on the natural breakup of gas as it is ejected from the tube opening to form bubbles. When the gas rises in the liquid, the surface tension causes it to tend to coalesce into large bubbles. However, the traditional bubbling tube structure cannot provide sufficient shear force to inhibit bubble coalescence, making it difficult to control the bubble diameter within a small range. Consequently, the gas-liquid contact surface area is limited, and the mass transfer rate is restricted.

[0004] Secondly, formaldehyde is prone to polymerization during absorption, generating adhesive paraformaldehyde solids that adhere to the inner wall of the nozzle during the ascent, leading to a decrease in spray volume. Existing solutions often involve increasing the pore size, periodic backwashing, or adding chemical polymerization inhibitors. However, increasing the pore size reduces atomization, backwashing requires shutdown and is difficult to completely remove stubborn deposits, and adding polymerization inhibitors increases operating costs and the risk of secondary pollution. Therefore, this application provides a tail gas processor for formaldehyde absorption processes to meet the requirements. Summary of the Invention

[0005] The purpose of this invention is to provide an exhaust gas processor for formaldehyde absorption processes to solve the above-mentioned problems. By setting a tangential exhaust pipe in the water bath area to drive the water to rotate and cooperate with the filter screen to achieve two-stage bubble cutting, and setting a spiral guide plate in the nozzle to drive the valve core to rotate and drive the scraper to self-clean, the problems of large bubbles, low gas-liquid contact efficiency and easy nozzle clogging mentioned in the background art are solved.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: A tail gas processor for formaldehyde absorption process includes a pretreatment tank and a treatment tower. An exhaust pipe is provided between the pretreatment tank and the treatment tower. An isolation cover is provided at the bottom of the interior of the treatment tower. One end of the exhaust pipe extends to the inside of the isolation cover. Multiple exhaust pipes are fixedly connected at equal intervals to the outside of the exhaust pipe and inside the isolation cover. A spray assembly is installed inside the treatment tower and above the isolation cover. The spray assembly includes a water supply pipe fixed inside the treatment tower, and multiple branch pipes are fixedly connected at equal intervals to the outside of the water supply pipe. Multiple nozzles can be detachably connected to the outside of each branch pipe. The nozzle includes a housing and a valve core rotatably disposed therein. The valve core consists of a valve stem, a disc, and a stop plate connected together. When water enters, the valve core rotates inside the housing. The disc is fixed at equal intervals on the outside of the valve stem. The disc consists of blades and scrapers connected together, and the scrapers are in contact with the inner wall of the housing. A spiral guide vane is fixedly connected inside the housing and above the scrapers to drive the incoming water to rotate and flow inside the housing. The blades are located inside the spiral guide vane. The spiral guide vane can make the water flow rotate and drive the valve core to rotate. The scrapers continuously scrape the inner wall of the housing to achieve online self-cleaning of the nozzle, thereby reducing nozzle clogging problems and ensuring the stable operation of the spray assembly. A gas guiding mechanism is fixedly connected inside the isolation hood and above the water supply pipe. Multiple baffles are fixedly connected at equal intervals on the inner wall of the isolation hood. The gas guiding mechanism includes a gas collecting hood fixed inside the treatment tower. A cyclone hood is fixedly connected to the top of the gas collecting hood. Multiple arc-shaped guide plates are fixedly connected at equal intervals inside the cyclone hood to guide the water-containing gas to the inner wall of the treatment tower. The horizontal height of the baffles and the exhaust port of the cyclone hood is the same. The cyclone hood uses centrifugal force to separate large droplets, and the baffles use inertial collision to intercept escaped small droplets. The two stages work together to achieve a highly efficient gas-liquid separation effect.

[0007] Based on the above scheme, a hydrocyclone is fixedly connected inside the treatment tower and between the isolation cover and the water supply pipe to comb the rising gas, so that the gas rotates and rises inside the treatment tower. An annular gap is formed between the isolation cover and the inner wall of the treatment tower. At least one layer of filter screen is fixedly connected between the isolation cover and the treatment tower to cut the rising bubbles.

[0008] Optionally, multiple return pipes are fixedly connected at equal intervals inside the isolation cover, and the inlet of the return pipe is located below the filter screen, for replenishing water to the inside of the isolation cover.

[0009] Optionally, at least one layer of packing disc is provided inside the treatment tower and between the water supply pipe and the air guiding mechanism, and the packing disc is filled with porous adsorption material. The porous adsorption material can deeply adsorb and purify the trace amounts of formaldehyde remaining after spraying, ensuring that the outlet concentration is consistently lower than the emission limit.

[0010] Optionally, the system also includes a platform, on the top of which is a storage tank. At least one conduit is fixedly connected to the outside of the storage tank, and one end of the conduit extends into the interior of the processing tower. Inside the processing tower and above the gas guiding mechanism, a demister is fixedly connected, and an exhaust manifold is provided above the demister.

[0011] Compared with the prior art, the present invention has at least the following beneficial effects: In the above-mentioned scheme, the exhaust gas processor for formaldehyde absorption process provided in this application uses the kinetic energy of the exhaust gas itself to drive the water body to rotate through the tangentially arranged exhaust pipe, generating a turbulent shear field, which refines the bubbles to 2-3 mm. Then, the bubbles are further refined to less than 1 mm by a filter screen. The two-stage physical cutting greatly increases the gas-liquid contact surface area compared with the traditional bubbling method, which can enhance the contact effect between gas and aqueous solution. Secondly, a spiral guide vane is installed inside the nozzle, which drives the valve core to rotate as the incoming water flows, causing the scraper to continuously scrape the inner wall of the housing, promptly removing polymers and significantly reducing nozzle clogging. In addition, the flared opening at the bottom of the housing cooperates with the stop plate at the bottom of the valve core to form a double-layer liquid curtain. During the gas rise, it comes into contact with the two liquid curtains one after the other, achieving two continuous sprays without increasing the number of nozzles, which can improve the absorption efficiency of formaldehyde. Furthermore, the arc-shaped guide vanes inside the cyclone shroud can cause the gas to rotate, using centrifugal force to throw the entrained large-diameter droplets towards the inner wall of the treatment tower, achieving primary separation. In conjunction with the baffles arranged at the same height as the exhaust port of the cyclone shroud, the gas discharged from the cyclone shroud can be intercepted a second time. The escaping fine droplets are effectively captured after impacting the baffles under inertia. The synergistic effect of the two-stage separation can reduce the water content of the discharged gas. Attached Figure Description

[0012] The accompanying drawings, which are incorporated herein and form part of the specification, illustrate embodiments of the invention and, together with the specification, further serve to explain the principles of the invention and enable those skilled in the art to practice and use the invention.

[0013] Figure 1 This is a schematic diagram of the overall structure of the exhaust gas processor of the formaldehyde absorption process of the present invention. Figure 2 This is a three-dimensional structural diagram of the processing tower of the present invention; Figure 3 This is a schematic diagram of the internal structure of the processing tower of the present invention; Figure 4 This is a schematic diagram showing the connection between the exhaust pipe, the isolation hood, and the treatment tower of the present invention; Figure 5 This is a three-dimensional structural diagram of the exhaust pipe of the present invention; Figure 6 This is a three-dimensional structural schematic diagram of the spray assembly of the present invention; Figure 7 This is a cross-sectional view of the nozzle of the present invention; Figure 8 This is a three-dimensional structural diagram of the valve core of the present invention; Figure 9This is a three-dimensional structural schematic diagram of the air guiding mechanism of the present invention; Figure 10 For the present invention Figure 3 Enlarged view of point A in the middle.

[0014] Figure label: 1. Platform; 2. Storage tank; 21. Conduit; 3. Pretreatment tank; 4. Treatment tower; 5. Exhaust pipe; 51. Exhaust pipe; 6. Isolation hood; 61. Return pipe; 62. Filter screen; 7. Cyclone separator; 8. Water supply pipe; 81. Branch pipe; 82. Nozzle; 821. Shell; 822. Spiral guide vane; 823. Valve core; 8231. Valve stem; 8232. Blade; 8233. Scraper; 8234. Stop plate; 9. Packing disc; 10. Air guiding mechanism; 101. Gas collection hood; 102. Cyclone hood; 11. Baffle plate; 12. Demister.

[0015] As shown in the figure, specific structures and devices are marked in the figure to clearly illustrate the structure of the embodiments of the present invention. However, this is only for illustrative purposes and is not intended to limit the present invention to this specific structure, device and environment. Those skilled in the art can adjust or modify these devices and environments according to specific needs. Detailed Implementation

[0016] The exhaust gas processor for formaldehyde absorption processes provided by the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art can use other alternative methods to implement some known technologies; moreover, the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.

[0017] It should be noted that the use of terms such as "an embodiment," "an embodiment," "an exemplary embodiment," and "some embodiments" in the specification indicates that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments (whether explicitly described or not) should be within the knowledge of those skilled in the art.

[0018] Generally, terms can be understood at least partly from their use in context. For example, depending at least partly on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in a singular sense, or a combination of features, structures, or characteristics in a plural sense. Additionally, the term "based on" can be understood not necessarily to convey an exclusive set of factors, but rather, alternatively, depending at least partly on the context, to allow for the presence of other factors that are not necessarily explicitly described.

[0019] It is understood that the meanings of “on”, “above”, and “above” in this invention should be interpreted in the broadest manner, such that “on” means not only “directly on” something, but also includes the meaning of being “on” something with an intervening feature or layer, and that “above” or “above” means not only “on” something, but also includes the meaning of being “on” something without an intervening feature or layer.

[0020] Furthermore, spatially related terms such as “below,” “under,” “lower,” “above,” and “upper” are used herein for convenience to describe the relationship of one element or feature to one or more other elements or features, as illustrated in the accompanying drawings. Spatially related terms are intended to cover different orientations in the use or operation of the device other than those depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially related descriptive terms used herein can be interpreted similarly.

[0021] like Figures 1 to 5 As shown, an embodiment of the present invention provides a tail gas processor for a formaldehyde absorption process, including a pretreatment tank 3 and a treatment tower 4. A water pump and a connected drain pipe are provided on the outside of the treatment tower 4. With this design, excess aqueous solution in the treatment tower 4 can be discharged. An exhaust gas pipe 5 is provided between the pretreatment tank 3 and the treatment tower 4. A fixed pipe is provided on the exhaust gas pipe 5. An electric valve and a monitoring sensor are provided in the pipe for detecting formaldehyde-containing gas. Subsequent treatment measures can be formulated according to the gas characteristics. An isolation cover 6 is provided at the bottom inside the treatment tower 4. One end of the exhaust gas pipe 5 extends to the inside of the isolation cover 6. Multiple exhaust pipes 51 are fixedly connected at equal intervals outside the exhaust gas pipe 5 and inside the isolation cover 6. The exhaust pipes 51 are arranged tangentially. The purpose is to use the kinetic energy of the exhaust gas itself to drive the water body to rotate, so as to generate a turbulent shear field without the need for additional stirring equipment. An annular gap is formed between the isolation hood 6 and the inner wall of the treatment tower 4. At least one layer of filter screen 62 is fixedly connected between the isolation hood 6 and the treatment tower 4 to cut the rising bubbles. The filter screen 62 has two layers with pore sizes of 2mm and 1mm respectively, which can refine the bubbles layer by layer. Through two-stage physical cutting, the specific surface area of ​​gas-liquid contact can be increased, thereby improving the mass transfer efficiency. Multiple return pipes 61 are fixedly connected at equal intervals inside the isolation hood 6, and the water inlet of the return pipe 61 is located below the filter screen 62 to replenish water to the inside of the isolation hood 6. Through this design, the water level in the water bath area is maintained and the secondary pollution caused by the backflow of surface scum is avoided, so as to ensure the long-term stable operation of the spray system. A hydrocyclone 7 is fixedly connected inside the treatment tower 4 and between the isolation hood 6 and the water supply pipe 8 to comb the rising gas, so that the gas rotates and rises inside the treatment tower 4. In this embodiment, as Figures 6 to 8 As shown, a spray assembly is installed inside the treatment tower 4 and above the isolation hood 6. The spray assembly includes a water supply pipe 8 fixed inside the treatment tower 4, and multiple branch pipes 81 are fixedly connected at equal intervals to the outside of the water supply pipe 8. Multiple nozzles 82 are detachably connected to the outside of each branch pipe 81. The bottom of the housing 821 is a flared shape, which can increase the coverage area of ​​the sprayed aqueous solution. The nozzle 82 includes a housing 821 and a valve core 823 rotatably disposed inside it. When water enters, the valve core 823 rotates inside the housing 821. This design... The valve core 823 can rotate automatically without external power. It has a simple structure and is energy-saving. The valve core 823 consists of a valve stem 8231, a disc, and a stop plate 8234 connected together. The function of the stop plate 8234 is to deflect part of the liquid to form an inner small-diameter liquid curtain, which together with the outer large-diameter liquid curtain forms an inner and outer double-layer structure. The advantage of this design is that the gas comes into contact with the two liquid curtains one after the other during the rising process. This is equivalent to achieving two continuous sprays without increasing the number of nozzles 82, which improves the gas-liquid contact efficiency and formaldehyde absorption rate. Furthermore: the discs are fixed equidistantly on the outside of the valve stem 8231. The discs are composed of connected blades 8232 and scrapers 8233, and the scrapers 8233 are in contact with the inner wall of the housing 821. A spiral guide vane 822 is fixedly connected inside the housing 821 and above the scrapers 8233 to drive the incoming water to rotate and flow inside the housing 821. The blades 8232 are located inside the spiral guide vane 822. The valve core 823 is made of ceramic material, and the scrapers 8233 are made of polytetrafluoroethylene material. When the valve core 823 rotates, it continuously scrapes the inner wall of the housing 821. The purpose is to remove the formaldehyde polymers attached to the inner wall of the housing 821 in a timely manner. This design achieves the self-cleaning of the nozzle 82, optimizes the atomization failure problem caused by polymer clogging in traditional nozzles, and reduces the need for frequent shutdowns for cleaning. In this embodiment, as Figure 9 and Figure 10As shown, a gas guiding mechanism 10 is fixedly connected inside the isolation hood 6 and above the water supply pipe 8. The gas guiding mechanism 10 includes a gas collecting hood 101 fixed inside the treatment tower 4. A swirl hood 102 is fixedly connected to the top of the gas collecting hood 101. Multiple arc-shaped guide plates are fixedly connected at equal intervals inside the swirl hood 102 to guide the water-containing gas to the inner wall of the treatment tower 4. Multiple baffles 11 are fixedly connected at equal intervals on the inner wall of the isolation hood 6. The baffles 11 and the water at the exhaust port of the swirl hood 102 are connected to each other. With consistent height, the gas guiding mechanism 10 adopts a cyclone shroud 102 and an arc-shaped guide plate structure. Its purpose is to make the gas rotate within the cyclone shroud 102, and use centrifugal force to throw the entrained water droplets toward the inner wall of the treatment tower 4 to achieve separation. It can perform secondary interception on the gas discharged from the cyclone shroud 102, and use inertial collision to capture the escaped fine droplets. The advantage of this design is that the combination of cyclone centrifugal separation and inertial collision interception forms a two-stage gas-liquid separation, thereby enhancing the droplet capture rate.

[0022] In this embodiment, as Figures 1 to 3 As shown, at least one layer of packing disc 9 is installed inside the treatment tower 4 and between the water supply pipe 8 and the gas guiding mechanism 10. The packing disc 9 is filled with porous adsorption material. The packing disc 9 has two layers: the lower layer is filled with ceramic Raschig rings and the upper layer is filled with activated carbon fiber. The large specific surface area of ​​the porous adsorption material further removes residual pollutants, ensuring that the outlet concentration is consistently lower than the emission limit. The tower also includes a platform 1, with a storage tank 2 installed on top of the platform 1. At least one conduit 21 is fixedly connected to the outside of the storage tank 2, and one end of the conduit 21 extends into the treatment tower 4. Its purpose is to replenish the tower with auxiliary treatment agents (such as defoamers). (or enhancer absorbent), the treatment scheme can be flexibly adjusted according to the changes in the concentration and composition of formaldehyde exhaust gas, which enhances the system's adaptability to different working conditions. Inside the treatment tower 4 and above the gas guiding mechanism 10, a demister 12 is fixedly connected, and an exhaust manifold is set above the demister 12. Its function is to finally capture the tiny droplets that remain after cyclone separation and deflection interception, further ensuring that the outlet gas is dry and clean and meets environmental emission standards. Inside the treatment tower 4 and on one side of the gas collecting hood 101, a guide pipe is set to guide the liquid separated from the cyclone hood 102 and the demister 12 out of the treatment tower 4.

[0023] Working principle of the invention: The exhaust gas first enters the pretreatment tank 3 for preliminary cooling and filtration, and then is transported to the inside of the isolation cover 6 through the exhaust pipe 5. The exhaust gas is tangentially sprayed into the water body inside the isolation cover 6 from the exhaust pipe 51, which is fixedly connected to the outside of the exhaust pipe 5 at equal intervals. The tangential force of the high-speed airflow drives the water body to rotate slowly. The rotating water body generates turbulence and shear force, which can tear and refine the formed bubbles, so that the bubble diameter is controlled below 2-3mm, thereby increasing the gas-liquid contact area. After being treated in a water bath, the bubbles are discharged from the gap between the bottom of the isolation hood 6 and the bottom wall of the treatment tower 4, and continue to rise in the annular gap. During the rise, the gas passes through the filter screen 62. The mesh of the filter screen 62 can cut the bubbles a second time, making the bubbles even smaller than 1 mm. In addition, the filter screen 62 can also play a role in uniformly distributing the airflow. Meanwhile, the return pipe 61 can continuously replenish the aqueous solution to the inside of the isolation hood 6. The gas continues to rise and enters the hydrocyclone 7. The hydrocyclone 7 combs and guides the gas, making the gas form a rotating upward flow inside the treatment tower 4, thus prolonging the gas residence time. Subsequently, the gas enters the spray zone, and the aqueous solution is distributed from the water supply pipe 8 to each nozzle 82 via the branch pipe 81. The solution is atomized and sprayed from the nozzle 82 to form a fine liquid curtain. The rotating and rising gas comes into countercurrent contact with the atomized droplets, and the formaldehyde molecules are captured by the absorbent. The aqueous solution inside the treatment tower 4 can be discharged through the water pump and drain pipe outside the treatment tower 4 to control the total amount of aqueous solution inside the treatment tower 4. Specifically: When the aqueous solution enters the housing 821, it first passes through the spiral guide vane 822 fixed inside it. The spiral guide vane 822 causes the water flow to rotate. The rotating water flow impacts the blades 8232 on the valve core 823, driving the valve core 823 to rotate as a whole. The rotation of the valve core 823 drives the scraper 8233 to continuously scrape the inner wall of the housing 821, removing the attached polymer and spraying it out with the water flow, thus realizing the online self-cleaning of the nozzle 82. like Figure 7 As shown, the bottom of the shell 821 is a flared opening. This design increases the area of ​​the sprayed aqueous solution. The stop plate 8234 at the bottom of the valve core 823 can deflect the residual aqueous solution, causing it to form a smaller diameter liquid curtain inside the outer liquid curtain. The two liquid curtains formed can come into contact with the rising gas twice to enhance the mixing effect of the aqueous solution and formaldehyde. At the same time, according to the characteristics of formaldehyde, auxiliary treatment agent can be delivered into the storage tank 2. The auxiliary treatment agent can be sprayed into the treatment tower 4 through the conduit 21 to mix with the rising gas and improve the treatment effect of formaldehyde. The gas continues to rise through the packing disc 9, where the porous adsorption material deeply adsorbs and purifies the trace amounts of formaldehyde remaining after spraying, while simultaneously capturing any escaping fine droplets. The gas then enters the gas guiding mechanism 10, and the gas entering the gas collecting hood 101 is guided into the cyclone hood 102. The arc-shaped guide plate inside the cyclone hood 102 causes the gas to rotate, and under centrifugal force, the entrained water droplets are thrown towards the inner wall of the treatment tower 4 for separation. Simultaneously, the baffle plate 11 fixed to the inner wall of the isolation hood 6 performs secondary interception on the gas exiting from the cyclone hood 102. Escaping fine droplets are captured after impacting the baffle plate 11, and the droplets fall under gravity. The gas continues to rise to the demister 12 to capture any remaining tiny droplets. Finally, the purified gas is discharged from the exhaust manifold.

[0024] This invention encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this invention. To provide the public with a thorough understanding of this invention, specific details are described in detail in the following preferred embodiments; however, those skilled in the art will fully understand the invention even without these details. Furthermore, to avoid unnecessary misunderstanding of the essence of this invention, well-known methods, processes, procedures, components, and circuits are not described in detail.

[0025] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A tail gas processor for a formaldehyde absorption process, comprising a pretreatment tank (3) and a treatment tower (4), wherein an exhaust gas pipe (5) is provided between the pretreatment tank (3) and the treatment tower (4), characterized in that, The processing tower (4) is provided with an isolation cover (6) at the bottom inside. One end of the exhaust pipe (5) extends to the inside of the isolation cover (6). Multiple exhaust pipes (51) are fixedly connected at equal intervals outside the exhaust pipe (5) and inside the isolation cover (6). A spray assembly is provided inside the processing tower (4) and above the isolation cover (6). The spray assembly includes a water supply pipe (8) fixed inside the processing tower (4). Multiple branch pipes (81) are fixedly connected at equal intervals on the outside of the water supply pipe (8). Multiple nozzles (82) can be detachably connected to the outside of each branch pipe (81). The nozzle (82) includes a housing (821) and a valve core (823) rotatably disposed therein. The valve core (823) is composed of a valve stem (8231), a disc and a stop plate (8234) connected together. When water enters the nozzle, the valve core (823) rotates inside the housing (821). An air guiding mechanism (10) is fixedly connected inside the isolation cover (6) and above the water supply pipe (8), and multiple baffles (11) are fixedly connected at equal intervals on the inner wall of the isolation cover (6).

2. The exhaust gas processor for formaldehyde absorption process according to claim 1, characterized in that, The discs are fixed at equal intervals on the outside of the valve stem (8231). The discs are composed of connected blades (8232) and scrapers (8233), and the scrapers (8233) are in contact with the inner wall of the housing (821).

3. The exhaust gas processor for formaldehyde absorption process according to claim 2, characterized in that, A spiral guide vane (822) is fixedly connected inside the housing (821) and above the scraper (8233) to drive the incoming water to rotate and flow inside the housing (821), and the vane (8232) is located inside the spiral guide vane (822).

4. The exhaust gas processor for formaldehyde absorption process according to claim 1, characterized in that, A hydrocyclone (7) is fixedly connected inside the treatment tower (4) and between the isolation cover (6) and the water supply pipe (8) to comb the rising gas so that the gas rotates and rises inside the treatment tower (4).

5. The exhaust gas processor for formaldehyde absorption process according to claim 1, characterized in that, An annular gap is formed between the isolation cover (6) and the inner wall of the processing tower (4). At least one layer of filter screen (62) is fixedly connected between the isolation cover (6) and the processing tower (4) for cutting the rising bubbles.

6. The exhaust gas processor for formaldehyde absorption process according to claim 1, characterized in that, The isolation cover (6) has multiple return pipes (61) fixedly connected at equal intervals inside, and the inlet of the return pipe (61) is located below the filter screen (62) to replenish water to the inside of the isolation cover (6).

7. The exhaust gas processor for formaldehyde absorption process according to claim 1, characterized in that, The gas guiding mechanism (10) includes a gas collecting hood (101) fixed inside the processing tower (4). A swirl hood (102) is fixedly connected to the top of the gas collecting hood (101). Multiple arc-shaped guide plates are fixedly connected at equal intervals inside the swirl hood (102) to guide the water-containing gas to the inner wall of the processing tower (4). The baffle plate (11) is at the same horizontal height as the exhaust port of the swirl hood (102).

8. The exhaust gas processor for formaldehyde absorption process according to claim 1, characterized in that, The treatment tower (4) is provided with at least one layer of packing disc (9) located inside the water supply pipe (8) and the air guiding mechanism (10), and the packing disc (9) is filled with porous adsorption material.

9. The exhaust gas processor for formaldehyde absorption process according to claim 1, characterized in that, It also includes a platform (1), on the top of which is a storage tank (2), and at least one conduit (21) is fixedly connected to the outside of the storage tank (2), and one end of the conduit (21) extends into the interior of the processing tower (4).

10. The exhaust gas processor for formaldehyde absorption process according to claim 1, characterized in that, A demister (12) is fixedly connected inside the processing tower (4) and above the air guiding mechanism (10), and an exhaust manifold is provided above the demister (12).

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