A harmful gas purifying filter and a processing device

Abstract

The application discloses a kind of purifying harmful gas filter and processing device, it is related to gas purification equipment technical field, including filter main part, the filter main part is the flat product of corrugated honeycomb, the filter main part is formed by special activated carbon paper and environmental protection adhesive compound processing, the surface of the filter main part and internal pore load have harmful gas scavenger function layer, the function layer is formed by impregnation-drying process;The impregnation-drying process includes: impregnation process and dynamic drying process.The application is realized by installing using impregnation-drying process, realizes the uniform load and stable combination function of harmful gas scavenger function layer on the surface of filter main part and internal pore, solves the problem that traditional filter catalyst function layer is unevenly distributed, and the problem that the combination force weak leads to the rapid attenuation of purification performance is solved, improves the sustained purification ability of filter to harmful gas.

Description

Technical Field

[0001] This invention relates to the field of gas purification equipment technology, specifically to a filter and processing device for purifying harmful gases. Background Technology

[0002] Existing hazardous gas filters mostly employ single activated carbon adsorption or simple catalyst impregnation, which have significant technical limitations. Traditional activated carbon has limited adsorption capacity, is easily saturated, and has low adsorption efficiency for some polar gases, such as formaldehyde. The catalyst functional layer loading process is crude, often resulting in uneven distribution and weak bonding with the substrate, leading to rapid degradation of purification performance. Inappropriate drying process parameters either leave residual solvents that affect the pore structure of the activated carbon or damage the catalyst activity at high temperatures, making it difficult to achieve a synergistic effect between adsorption and catalysis, and thus failing to meet the actual needs for continuous and efficient purification.

[0003] Patent CN105056655B discloses a honeycomb activated carbon filter, which achieves efficient utilization of activated carbon filter.

[0004] The aforementioned patent includes a frame and a filter body, with the filter body located inside the frame. The frame includes a front frame and a rear frame, both of which are hollow at their centers. The frame has borders around its perimeter, including a front border and a rear border. The front border is formed by the four sides of the front frame, and the rear border by the four sides of the rear frame. The front border has a groove for securing a cover plate. The cover plate has an edge to fix the filter to the frame. The cover plate includes a convex plate that matches and inserts into the groove. The filter body is composed of several stacked honeycomb-shaped hexagonal grids. This invention is rationally designed and has a simple structure. By securing the filter body with the cover plate, filter replacement can be achieved, effectively preventing the waste caused by the frame and filter being integrally formed. Furthermore, the honeycomb grid shape of the filter body enables efficient utilization of the activated carbon filter. However, the aforementioned patent still has room for optimization in terms of the synergy between adsorption and catalysis.

[0005] Therefore, this application proposes a filter and processing device for purifying harmful gases that can achieve synergistic adsorption and catalysis. Summary of the Invention

[0006] The purpose of this invention is to provide a filter and processing device for purifying harmful gases, so as to solve the technical problem mentioned in the background art of difficulty in achieving the synergistic effect of adsorption and catalysis.

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

[0008] Compared with the prior art, the beneficial effects of the present invention are: a filter for purifying harmful gases, including a filter body, wherein the filter body is a corrugated honeycomb flat product, the filter body is made of special activated carbon paper and environmentally friendly adhesive, and the surface and internal pores of the filter body are loaded with a harmful gas removal agent functional layer, the functional layer being formed by an impregnation-drying process;

[0009] The impregnation-drying process includes: an impregnation process and a dynamic drying process;

[0010] The impregnation process involves placing the pre-formed filter body in a spray chamber and spraying an impregnation solution containing a formaldehyde oxidation catalyst using a nozzle array with atomized particle size. The filter body is transported by a conveyor belt, and the impregnation solution coverage is ≥95%.

[0011] The dynamic drying process involves the impregnated filter body continuously passing through seven temperature-zone tunnel drying ovens, sequentially experiencing:

[0012] Preheat the temperature to 60-70℃ for 1-2 minutes;

[0013] Surface dry at 75-85℃ for 1-2 minutes;

[0014] Main drying I, 90-105℃, 3-4 min;

[0015] Main drying II, 110-125℃, 5-8 min;

[0016] Step curing, 130℃-160℃, 4-8 min;

[0017] Slow cool, 80℃-50℃, for 2-3 minutes;

[0018] Forced cooling, room temperature with strong airflow, 1-2 minutes.

[0019] Preferably, the performance parameters of the special activated carbon paper meet the following requirements: weight 180-200g / m2, carbon content ≥40-50%, thickness 0.45±0.05mm, activated carbon iodine value ≥1100, tensile strength longitudinally ≥50N, transversely ≥40N, stiffness ≥5. The carbon content and iodine value together ensure the adsorption capacity of activated carbon for harmful gases such as acetaldehyde, acetic acid, ammonia, toluene and formaldehyde. The tensile strength and stiffness ensure that the main structure is not easily damaged during processing and use. The thickness tolerance control ensures the uniformity of the corrugated honeycomb structure.

[0020] Preferably, the environmentally friendly adhesive has a solid content of ≥50% and a viscosity of ≥60 centipoise. The solid content and viscosity parameters ensure that the adhesive can be uniformly adhered to the surface of the special activated carbon paper during the composite processing, and that a strong bond can be formed between the corrugations after curing, thus avoiding delamination during use.

[0021] Preferably, the corrugated spacing of the corrugated honeycomb structure is 7.5±0.3mm. The tolerance control of the corrugated spacing can ensure the uniformity of airflow in the honeycomb channel and avoid the situation where harmful gases do not fully contact the functional layer due to excessively fast local airflow.

[0022] Preferably, the deodorization efficiency of the harmful gas scavenger functional layer for acetaldehyde, acetic acid, ammonia, toluene, and formaldehyde in the air is ≥99.9%. This efficiency is achieved through the synergistic effect of uniform loading of the functional layer and the adsorption performance of the activated carbon substrate during the impregnation-drying process.

[0023] A processing apparatus for purifying harmful gas filters includes an impregnation device and a drying device, wherein the impregnation device is used to perform the impregnation process, and the drying device is used to perform the dynamic drying process.

[0024] The impregnation device includes a spray chamber, a nozzle array, and a conveyor belt. The spray chamber is made of transparent material and is used to house the filter body and the nozzle array, preventing the liquid from splashing outside the equipment and allowing observation of the spraying process. The nozzle array is located in a sealed cavity and is distributed on the upper and lower sides of the filter body. It is used to spray the impregnation liquid containing formaldehyde oxidation catalyst. The conveyor belt is a chain conveyor that runs through the sealed cavity and is connected to the drying device. It is used to transport the filter body and make the filter body pass through the sealed cavity flat to the drying device.

[0025] The drying device includes 16 tunnel ovens, which are divided into 7 groups: the first tunnel oven is the first group, the second tunnel oven is the second group, the third and fourth tunnel ovens are the third group, the fifth, sixth, seventh and eighth tunnel ovens are the fourth group, the ninth, tenth, eleventh and twelfth tunnel ovens are the fifth group, the thirteenth and fourteenth tunnel ovens are the sixth group, and the fifteenth and sixteenth tunnel ovens are the seventh group. The seven groups of tunnel ovens correspond to seven functional areas, which are used to sequentially realize the preheating, surface drying, main drying I, main drying II, stepped curing, slow cooling and forced cooling of the dynamic drying process described in claim 1.

[0026] Preferably, the first set of tunnel-type ovens is a preheating zone used to balance the temperature of the filter body to 60-70°C, so as to avoid the cold filter screen from suddenly encountering high temperature and causing the impregnation liquid to boil and splash. The processing time is 1-2 minutes.

[0027] Preferably, the second set of tunnel ovens is a surface drying zone, used to place the filter body in an environment of 75-85℃ to evaporate the surface layer of the solvent in the impregnation liquid, preventing dripping contamination of the conveyor belt, with a processing time of 1-2 minutes.

[0028] Preferably, the third tunnel-type oven is the main drying zone I, which is used to place the filter body in an environment of 90-105℃ for medium-temperature deep drying, so that the impregnation liquid can penetrate into the internal pores of the activated carbon, and the treatment time is 3-4 minutes.

[0029] The fourth tunnel-type oven is the main drying zone II, which is used to place the filter body in an environment of 110-125℃ for high-temperature enhanced drying to thoroughly remove residual solvents and ensure that the specific surface area of ​​activated carbon is fully exposed. The processing time is 5-8 minutes.

[0030] The fifth tunnel-type oven is a stepped curing zone, used to place the filter body in an environment with a gradient temperature increase from 130℃ to 140℃, 140℃ to 150℃, and 150℃ to 160℃, to activate the chemical catalyst and form stable chemical bonds. The treatment time is 4-8 minutes.

[0031] Preferably, the sixth tunnel-type oven is a slow cooling zone, used to place the filter body in an environment with a gradient cooling from 80°C to 50°C, to prevent the high-temperature filter screen from cracking due to sudden cooling and to release internal stress, with a processing time of 2-3 minutes.

[0032] The seventh tunnel-type oven is a forced cooling zone, used to rapidly cool the filter body to room temperature using strong airflow at room temperature, facilitating subsequent winding and cutting. The processing time is 1-2 minutes.

[0033] Compared with the prior art, the beneficial effects of the present invention are:

[0034] 1. This invention achieves uniform loading and stable bonding of the harmful gas scavenger functional layer on the surface and internal pores of the filter body by employing an impregnation-drying process. This solves the problem of rapid degradation of purification performance caused by uneven distribution and weak bonding of the catalyst functional layer in traditional filters, and improves the filter's continuous purification capability for harmful gases.

[0035] 2. By using special activated carbon paper that meets specific parameters and a corrugated honeycomb structure, this invention achieves efficient adsorption of harmful gases such as acetaldehyde and formaldehyde, solving the problems of limited adsorption capacity and low adsorption efficiency of polar gases in traditional activated carbon, and improving the adsorption capacity and purification efficiency of the filter.

[0036] 3. This invention achieves a strong composite function between the corrugated parts of the filter body by using an environmentally friendly adhesive with a solid content of ≥50% and a viscosity of ≥60 centipoise, which solves the problem of delamination that easily occurs during the use of traditional filters and improves the structural stability and service life of the filter.

[0037] 4. This invention achieves gradient drying and curing of the filter body after impregnation through seven sets of tunnel-type drying ovens in the drying device. It solves the problems of residual solvent affecting activated carbon pores and high temperature damaging catalyst activity in traditional drying processes, and improves the synergistic effect of filter adsorption and catalytic performance and long-term stability. Attached Figure Description

[0038] Figure 1 The filter of this invention. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0041] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0042] Example 1

[0043] Please see Figure 1 The present invention provides an embodiment of a filter for purifying harmful gases and a processing device, wherein the raw materials for filter preparation and the processing parameters are as follows:

[0044] Special activated carbon paper: 190g / m² 2 It has a carbon content of 45%, a thickness of 0.45 mm, an iodine value of 1150, a tensile strength of 55 N in the longitudinal direction and 42 N in the transverse direction, a stiffness of 6, a black appearance, and a smooth, undamaged surface.

[0045] Environmentally friendly adhesive: 52% solids content, 65 centipoise viscosity, packaged in plastic drums;

[0046] Corrugated honeycomb structure: corrugation spacing 7.5mm, dimensions 735×463×5mm, flat plate shape;

[0047] Harmful gas scavenger functional layer: Loaded through an impregnation-drying process, the impregnation solution contains a formaldehyde oxidation catalyst, and the impregnation coverage is 96%;

[0048] Dynamic drying process: The product passes through 7 sets of tunnel-type drying ovens in sequence. Specific parameters:

[0049] Group 1, preheating: 65℃, total duration 1.5min;

[0050] The second group, surface drying: 80℃, total time 1.5min;

[0051] The third group, main drying I: 100℃, total time 3.5min;

[0052] Group 4, Main Drying II: 120℃, total time 6min;

[0053] The fifth group, stepped curing: the temperature is increased in a gradient of 130℃, 140℃, 150℃ and 160℃, with each box increasing by 10℃ in turn, for a total time of 6 minutes;

[0054] The sixth group, slow cooling section: the temperature is reduced in a gradient of 80℃ and 50℃, with the two boxes being 80℃ and 50℃ respectively, for a total duration of 2.5 minutes;

[0055] Group 7, Forced Cooling: Room temperature with strong wind, total duration 1.5 min;

[0056] Processing steps:

[0057] S1. Place the formed corrugated honeycomb structure at the feed inlet of the transparent spray chamber, start the chain conveyor belt at a speed of 0.5m / min, and the filter body enters the cavity with the conveyor belt;

[0058] S2. Activate the nozzle array with 3 nozzles on the top and 3 on the bottom, staggered in position, to spray the impregnation liquid containing formaldehyde oxidation catalyst. The filter body passes through the cavity for 2 minutes, and the impregnation liquid coverage reaches 96%. After exiting from the outlet, it enters the drying device.

[0059] S3. The filter body enters the No. 1 tunnel oven, set the temperature to 65℃, maintain the conveyor belt speed at 0.5m / min, and stay for 1.5min to balance the temperature of the filter body to 60-65℃, so as to avoid splashing of impregnation liquid due to high temperature later.

[0060] S4. Enter the No. 2 tunnel oven at 80℃ and stay for 1.5 minutes to evaporate the surface moisture of the impregnation liquid. The surface dryness is tested and found to be over 90%, with no dripping.

[0061] S5. Enter the No. 3 and No. 4 tunnel ovens, temperature 100℃, total stay 3.5min, 1.75min per oven, medium temperature to allow the impregnation liquid to penetrate into the internal pores of the activated carbon, with a penetration depth of 120μm;

[0062] S6. Enter tunnel ovens No. 5, 6, 7, and 8, at a temperature of 120℃, for a total stay of 6 minutes, with 1.5 minutes per oven, to thoroughly remove residual solvents, with a residual amount of ≤0.01%, and to fully expose the specific surface area of ​​activated carbon.

[0063] S7. Enter tunnel ovens No. 9, 10, 11, and 12, with temperatures of 130℃, 140℃, 150℃, and 160℃ respectively, increasing by 10℃ in each oven, for a total stay of 6 minutes, with each oven holding for 1.5 minutes. This activates the formaldehyde oxidation catalyst, forming stable chemical bonds and increasing the catalytic activity to 1.2 times the initial value.

[0064] S8. Enter the No. 13 and No. 14 tunnel ovens, with temperatures of 80℃ and 50℃ respectively, for a total stay of 2.5 minutes, 1.25 minutes per oven, to release internal stress and prevent the substrate from cracking;

[0065] S9. Enter tunnel ovens No. 15 and No. 16, turn on the strong air at room temperature, with a wind speed of 10m / s, stay for a total of 1.5min, 0.75min per oven, and cool down to room temperature.

[0066] Example 2

[0067] Please see Figure 1 The present invention provides an embodiment of a filter and processing device for purifying harmful gases. The difference between this embodiment and Embodiment 1 is that the raw materials for filter preparation and the processing parameters are as follows:

[0068] Special activated carbon paper: 190g / m² 2 It has a carbon content of 35%, a thickness of 0.45 mm, an iodine value of 1150, a tensile strength of 55 N in the longitudinal direction and 42 N in the transverse direction, a stiffness of 6, a black appearance, and a smooth, undamaged surface.

[0069] Environmentally friendly adhesive: 48% solids content, 55 centipoise viscosity, packaged in plastic drums;

[0070] Corrugated honeycomb structure: corrugation spacing 7.5mm, dimensions 735×463×5mm, flat plate shape;

[0071] Harmful gas scavenger functional layer: loaded through impregnation-drying process, the impregnation solution contains formaldehyde oxidation catalyst, and the impregnation coverage is 96%.

[0072] Example 3

[0073] Please see Figure 1 The present invention provides an embodiment of a filter and processing device for purifying harmful gases. The difference between this embodiment and Embodiment 1 is that the raw materials for filter preparation and the processing parameters are as follows:

[0074] Special activated carbon paper: 190g / m² 2 It has a carbon content of 45%, a thickness of 0.45 mm, an iodine value of 1150, a tensile strength of 55 N in the longitudinal direction and 42 N in the transverse direction, a stiffness of 6, a black appearance, and a smooth, undamaged surface.

[0075] Environmentally friendly adhesive: 52% solids content, 65 centipoise viscosity, packaged in plastic drums;

[0076] Corrugated honeycomb structure: corrugation spacing 7.9mm, dimensions 735×463×5mm, flat plate shape;

[0077] Harmful gas scavenger functional layer: Loaded through impregnation-drying process, the impregnation solution contains formaldehyde oxidation catalyst, and the impregnation coverage is 94%.

[0078] Example 4

[0079] Please see Figure 1 The present invention provides an embodiment of a filter and processing device for purifying harmful gases. The difference between this embodiment and Embodiment 1 is that the raw materials for filter preparation and the processing parameters are as follows:

[0080] Special activated carbon paper: 190g / m² 2 Carbon content 45%, thickness 0.51mm, iodine value 1050, tensile strength 55N longitudinally and 42N transversely, stiffness 4, black appearance, smooth and undamaged surface;

[0081] Environmentally friendly adhesive: 52% solids content, 65 centipoise viscosity, packaged in plastic drums;

[0082] Corrugated honeycomb structure: corrugation spacing 7.5mm, dimensions 735×463×5mm, flat plate shape;

[0083] Harmful gas scavenger functional layer: loaded through impregnation-drying process, the impregnation solution contains formaldehyde oxidation catalyst, and the impregnation coverage is 96%.

[0084] Example 5

[0085] Please see Figure 1 The present invention provides an embodiment of a filter and processing device for purifying harmful gases. The difference between this embodiment and Embodiment 1 is that the raw materials for filter preparation and the processing parameters are as follows:

[0086] Special activated carbon paper: 190g / m² 2 It has a carbon content of 45%, a thickness of 0.45 mm, an iodine value of 1150, a tensile strength of 55 N in the longitudinal direction and 42 N in the transverse direction, a stiffness of 6, a black appearance, and a smooth, undamaged surface.

[0087] Environmentally friendly adhesive: 52% solids content, 65 centipoise viscosity, packaged in plastic drums;

[0088] Corrugated honeycomb structure: corrugation spacing 7.5mm, dimensions 735×463×5mm, flat plate shape;

[0089] Harmful gas scavenger functional layer: Loaded through an impregnation-drying process, the impregnation solution contains a formaldehyde oxidation catalyst, and the impregnation coverage is 96%;

[0090] Dynamic drying process: The product passes through 7 sets of tunnel-type drying ovens in sequence. Specific parameters:

[0091] Group 1, preheating: 65℃, total duration 1.5min;

[0092] The second group, surface drying: 80℃, total time 1.5min;

[0093] The third group, main drying I: 100℃, total time 3.5min;

[0094] Group 4, Main Drying II: 105℃, total duration 4min;

[0095] The fifth group, stepped curing: the temperature is increased in a gradient of 120℃, 130℃, 140℃ and 150℃, with each box increasing by 10℃ in turn, for a total time of 3 minutes;

[0096] The sixth group, slow cooling section: the temperature is reduced in a gradient of 80℃ and 50℃, with the two boxes being 80℃ and 50℃ respectively, for a total duration of 2.5 minutes;

[0097] Group 7, Forced Cooling: Normal temperature and strong wind, total duration 1.5 min.

[0098] Example 6

[0099] Please see Figure 1 The present invention provides an embodiment of a filter and processing device for purifying harmful gases. The difference between this embodiment and Embodiment 1 is that the raw materials for filter preparation and the processing parameters are as follows:

[0100] Special activated carbon paper: 190g / m² 2 It has a carbon content of 45%, a thickness of 0.45 mm, an iodine value of 1150, a tensile strength of 55 N in the longitudinal direction and 42 N in the transverse direction, a stiffness of 6, a black appearance, and a smooth, undamaged surface.

[0101] Environmentally friendly adhesive: 52% solids content, 65 centipoise viscosity, packaged in plastic drums;

[0102] Corrugated honeycomb structure: corrugation spacing 7.5mm, dimensions 735×463×5mm, flat plate shape;

[0103] Harmful gas scavenger functional layer: Loaded through an impregnation-drying process, the impregnation solution contains a formaldehyde oxidation catalyst, and the impregnation coverage is 96%;

[0104] Dynamic drying process: The product passes through 7 sets of tunnel-type drying ovens in sequence. Specific parameters:

[0105] Group 1, preheating: 65℃, total duration 1.5min;

[0106] The second group, surface drying: 80℃, total time 1.5min;

[0107] The third group, main drying I: 85℃, total time 2min;

[0108] Group 4, Main Drying II: 120℃, total time 6min;

[0109] The fifth group, stepped curing: the temperature is increased in a gradient of 130℃, 140℃, 150℃ and 160℃, with each box increasing by 10℃ in turn, for a total time of 6 minutes;

[0110] The sixth group, slow cooling section: the temperature is reduced in a gradient of 80℃ and 50℃, with the two boxes being 80℃ and 50℃ respectively, for a total duration of 2.5 minutes;

[0111] Group 7, Forced Cooling: Normal temperature and strong wind, total duration 1.5 min.

[0112] Example 7

[0113] Please see Figure 1 The present invention provides an embodiment of a filter and processing device for purifying harmful gases. The difference between this embodiment and Embodiment 1 is that the raw materials for filter preparation and the processing parameters are as follows:

[0114] Special activated carbon paper: 190g / m² 2 It has a carbon content of 45%, a thickness of 0.45 mm, an iodine value of 1150, a tensile strength of 55 N in the longitudinal direction and 42 N in the transverse direction, a stiffness of 6, a black appearance, and a smooth, undamaged surface.

[0115] Environmentally friendly adhesive: 52% solids content, 65 centipoise viscosity, packaged in plastic drums;

[0116] Corrugated honeycomb structure: corrugation spacing 7.5mm, dimensions 735×463×5mm, flat plate shape;

[0117] Harmful gas scavenger functional layer: Loaded through an impregnation-drying process, the impregnation solution contains a formaldehyde oxidation catalyst, and the impregnation coverage is 96%;

[0118] Dynamic drying process: The product passes through 7 sets of tunnel-type drying ovens in sequence. Specific parameters:

[0119] Group 1, preheating: 55℃, total duration 0.5min;

[0120] The second group, surface drying: 80℃, total time 1.5min;

[0121] The third group, main drying I: 100℃, total time 3.5min;

[0122] Group 4, Main Drying II: 120℃, total time 6min;

[0123] The fifth group, stepped curing: the temperature is increased in a gradient of 130℃, 140℃, 150℃ and 160℃, with each box increasing by 10℃ in turn, for a total time of 6 minutes;

[0124] The sixth group, slow cooling section: the temperature is reduced in a gradient of 80℃ and 50℃, with the two boxes being 80℃ and 50℃ respectively, for a total duration of 2.5 minutes;

[0125] Group 7, Forced Cooling: Normal temperature and strong wind, total duration 1.5 min.

[0126] Experiment 1

[0127] The deodorization performance of the harmful gas purification filter of Example 1 was tested before and after processing:

[0128] 1. Experimental equipment: 8m 3 Experimental box;

[0129] 2. Testing method: 8m 3 A fixed amount of five gases—acetaldehyde, acetic acid, ammonia, toluene, and formaldehyde—were injected into the experimental chamber. After injection, the air purifier was turned on for 30 minutes. Then, the gas composition in the experimental chamber was analyzed using a Fourier transform infrared spectrometer.

[0130] 3. Experimental Results: Detailed results are shown in Table 1 (pre-processing test results) and Table 2 (post-processing test results).

[0131] Table 1. Pre-processing test results

[0132]

[0133] Table 2. Test results after processing

[0134]

[0135] Experiment 2

[0136] A comparative test was conducted on the deodorization performance of the harmful gas purification filters in Examples 1-7:

[0137] 1. Experimental equipment: 8m 3 Experimental box;

[0138] 2. Testing method: 8m 3 A fixed amount of five gases—acetaldehyde, acetic acid, ammonia, toluene, and formaldehyde—were injected into the experimental chamber. After injection, the air purifier was turned on for 30 minutes. Then, the gas composition in the experimental chamber was analyzed using a Fourier transform infrared spectrometer.

[0139] 3. Experimental Results: Detailed results are shown in Table 3, comparing deodorization performance.

[0140] Table 3 Comparison of deodorization performance

[0141]

[0142] 1. In Experiment 1, the 30-minute removal efficiency of the processed product for each gas was significantly better than that of the unprocessed product at all detection time points, and the total removal efficiency of the processed product was significantly improved compared with that of the unprocessed product.

[0143] 2. In Experiment 2, the gas removal efficiency of Example 1 group was better than that of other example groups after 30 minutes of testing. After the parameters of other example groups deviated, the gas removal efficiency of each gas could not reach that of Example 1 group.

[0144] In summary, under the experimental conditions, the experimental product has the effect of efficiently and stably purifying harmful gases such as acetaldehyde, acetic acid, ammonia, toluene, and formaldehyde.

[0145] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A filter for purifying harmful gases, characterized in that: The filter includes a filter body, which is a corrugated honeycomb flat product. The filter body is made of a composite of special activated carbon paper and environmentally friendly adhesive. A harmful gas scavenging functional layer is loaded onto the surface and internal pores of the filter body, and this functional layer is formed through an impregnation-drying process. The special activated carbon paper has the following performance parameters: weight 180-200 g / m³. 2 The activated carbon has a carbon content of ≥40-50%, a thickness of 0.45±0.05mm, an iodine value of ≥1100, a tensile strength of ≥50N in the longitudinal direction and ≥40N in the transverse direction, and a stiffness of ≥5. The carbon content and iodine value together ensure the adsorption capacity of activated carbon for harmful gases such as acetaldehyde, acetic acid, ammonia, toluene, and formaldehyde. The tensile strength and stiffness ensure that the main structure is not easily damaged during processing and use. The thickness tolerance control ensures the uniformity of the corrugated honeycomb structure. The impregnation-drying process includes: an impregnation process and a dynamic drying process; The impregnation process involves placing the pre-formed filter body in a spray chamber and spraying an impregnation solution containing a formaldehyde oxidation catalyst using a nozzle array with atomized particle size. The filter body is transported by a conveyor belt, and the impregnation solution coverage is ≥95%. The dynamic drying process involves the impregnated filter body continuously passing through seven temperature-zone tunnel drying ovens, sequentially experiencing: Preheat the temperature to 60-70℃ for 1-2 minutes; Surface dry at 75-85℃ for 1-2 minutes; Main drying I, 90-105℃, 3-4 min; Main drying II, 110-125℃, 5-8 min; Step curing, 130℃-160℃, 4-8 min; Slow cool, 80℃-50℃, for 2-3 minutes; Forced cooling, room temperature with strong airflow, 1-2 minutes.

2. The filter for purifying harmful gases according to claim 1, characterized in that: The environmentally friendly adhesive has a solid content of ≥50% and a viscosity of ≥60 centipoise. The solid content and viscosity parameters ensure that the adhesive can be uniformly adhered to the surface of the special activated carbon paper during the composite processing, and can form a strong bond between the corrugations after curing, thus avoiding delamination during use.

3. A filter for purifying harmful gases according to claim 1, characterized in that: The corrugated honeycomb flat product has a corrugation spacing of 7.5±0.3mm. The tolerance control of the corrugation spacing can ensure the uniformity of airflow in the honeycomb channel and avoid the situation where harmful gases do not fully contact the functional layer due to excessively fast local airflow.

4. A filter for purifying harmful gases according to claim 1, characterized in that: The harmful gas scavenger functional layer has a deodorization efficiency of ≥99.9% for acetaldehyde, acetic acid, ammonia, toluene, and formaldehyde in the air. This efficiency is achieved through the synergistic effect of uniform loading of the functional layer and the adsorption performance of the activated carbon substrate during the impregnation-drying process.

5. A processing apparatus for a harmful gas purification filter, applicable to the harmful gas purification filter described in claim 1, characterized in that: It includes an impregnation device and a drying device, wherein the impregnation device is used to perform the impregnation process, and the drying device is used to perform the dynamic drying process; The impregnation device includes a spray chamber, a nozzle array, and a conveyor belt. The spray chamber is made of transparent material and is used to house the filter body and the nozzle array, preventing the liquid from splashing outside the equipment and allowing observation of the spraying process. The nozzle array is located in a sealed cavity and is distributed on the upper and lower sides of the filter body. It is used to spray the impregnation liquid containing formaldehyde oxidation catalyst. The conveyor belt is a chain conveyor that runs through the sealed cavity and is connected to the drying device. It is used to transport the filter body and make the filter body pass through the sealed cavity flat to the drying device. The drying device includes 16 tunnel ovens, which are divided into 7 groups: the first tunnel oven is the first group, the second tunnel oven is the second group, the third and fourth tunnel ovens are the third group, the fifth, sixth, seventh and eighth tunnel ovens are the fourth group, the ninth, tenth, eleventh and twelfth tunnel ovens are the fifth group, the thirteenth and fourteenth tunnel ovens are the sixth group, and the fifteenth and sixteenth tunnel ovens are the seventh group. The seven groups of tunnel ovens correspond to seven functional areas, which are used to sequentially realize the preheating, surface drying, main drying I, main drying II, stepped curing, slow cooling and forced cooling of the dynamic drying process.

6. The processing apparatus for a harmful gas purification filter according to claim 5, characterized in that: The first set of tunnel-type ovens is a preheating zone, used to balance the temperature of the filter body to 60-70℃, to prevent the cold filter from suddenly encountering high temperature and causing the impregnation liquid to boil and splash. The processing time is 1-2 minutes.

7. The processing apparatus for a harmful gas purification filter according to claim 5, characterized in that: The second set of tunnel-type ovens is a surface drying zone, used to place the filter body in an environment of 75-85℃ to evaporate the surface layer of the solvent in the impregnation liquid, preventing dripping and contamination of the conveyor belt, with a processing time of 1-2 minutes.

8. The processing apparatus for purifying harmful gas filters according to claim 5, characterized in that: The third tunnel-type oven is the main drying zone I, which is used to place the filter body in an environment of 90-105℃ for medium-temperature deep drying, allowing the impregnation liquid to penetrate into the internal pores of the activated carbon, with a treatment time of 3-4 minutes. The fourth tunnel-type oven is the main drying zone II, which is used to place the filter body in an environment of 110-125℃ for high-temperature enhanced drying to thoroughly remove residual solvents and ensure that the specific surface area of ​​activated carbon is fully exposed. The processing time is 5-8 minutes. The fifth tunnel-type oven is a stepped curing zone, used to place the filter body in an environment with a gradient temperature increase from 130℃ to 140℃, 140℃ to 150℃, and 150℃ to 160℃, to activate the chemical catalyst and form stable chemical bonds. The treatment time is 4-8 minutes.

9. The processing apparatus for purifying harmful gas filters according to claim 5, characterized in that: The sixth tunnel-type oven is a slow cooling zone, used to place the filter body in an environment with a gradient cooling from 80℃ to 50℃ to prevent the high-temperature filter screen from cracking due to sudden cooling and to release internal stress. The processing time is 2-3 minutes. The seventh tunnel-type oven is a forced cooling zone, used to rapidly cool the filter body to room temperature using strong airflow at room temperature, facilitating subsequent winding and cutting. The processing time is 1-2 minutes.

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