Filter for purifying harmful gas and processing device

Abstract

The invention discloses a harmful gas purification filter and a processing device, and relates to the technical field of gas purification equipment, the harmful gas purification filter comprises a filter main body, the filter main body is a corrugated honeycomb flat-plate-shaped product, and the filter main body is formed by composite processing of special activated carbon paper and an environment-friendly adhesive; a harmful gas scavenger functional layer is loaded on the surface and in internal pores of the filter main body, and the functional layer is formed by a dipping-drying process; the dipping-drying process comprises a dipping process and a dynamic drying process. According to the present invention, the impregnation-drying process is adopted, such that the uniform loading and stable combination functions of the harmful gas scavenging agent functional layer on the surface of the filter main body and the internal pores are achieved, and the problem of rapid purification performance degradation caused by non-uniform distribution and weak binding force of the catalyst functional layer of the traditional filter is solved; and the continuous purification capability of the filter on harmful gas is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas purification equipment, in particular to a harmful gas purification filter and processing device. BACKGROUND

[0003] The existing harmful gas filter mostly adopts single activated carbon adsorption or simple catalyst impregnation method, which has obvious technical limitations. The traditional activated carbon adsorption capacity is limited, easy to saturate, and has low adsorption efficiency for some polar gases such as formaldehyde. The catalyst functional layer loading process is rough, and problems such as uneven distribution and weak bonding with the substrate often occur, resulting in rapid degradation of purification performance. The unreasonable drying process parameters either affect the pore structure of activated carbon due to residual solvents or destroy the activity of catalysts at high temperature, making it difficult to balance the synergistic effect of adsorption and catalysis, and unable to meet the actual demand for continuous and efficient purification.

[0004] Patent CN105056655B discloses a honeycomb activated carbon filter screen, which realizes efficient utilization of activated carbon filter screen.

[0005] The above-mentioned patent includes a frame and a filter screen body, the filter screen body is located inside the frame, the frame includes a front frame and a rear frame, the centers of the front frame and the rear frame are hollow, the frame is provided with a frame around the frame, the frame around the frame includes a front frame and a rear frame, the four around the front frame is a front frame, and the four around the rear frame is a rear frame. The front frame is provided with a groove, the groove is used for buckling a cover plate, the cover plate is provided with an eave, the filter screen is fixed on the frame, the cover plate includes a convex plate, the convex plate and the groove are matched and inserted together; the filter screen body is composed of a plurality of honeycomb-shaped grids, and the grid is a hexagon. The present application has reasonable design and simple structure, the filter plate body can be clamped by the cover plate to realize replacement of the filter screen, effectively prevent the waste of the frame caused by the integration of the frame and the filter screen, and the filter screen body adopts a honeycomb-shaped grid shape to realize efficient utilization of activated carbon filter screen. However, the above-mentioned patent still has optimization space in the synergistic effect of adsorption and catalysis.

[0006] Therefore, the present application provides a harmful gas purification filter and processing device which can realize the synergistic effect of adsorption and catalysis. SUMMARY

[0007] The present application aims to provide a harmful gas purification filter and processing device to solve the technical problem of difficult to balance the synergistic effect of adsorption and catalysis in the background art.

[0008] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0009] Compared with the prior art, the present application has the beneficial effects that: a harmful gas purification filter comprises a filter body which is a corrugated honeycomb flat plate product, the filter body is composed of special activated carbon paper and environment-friendly adhesive, and a harmful gas scavenger functional layer is loaded on the surface and internal pores of the filter body, and the functional layer is formed by an impregnation-drying process.

[0010] The impregnation-drying process comprises an impregnation process and a dynamic drying process.

[0011] The impregnation process is that: the formed filter body is placed in a spraying chamber, a nozzle array is used to spray an impregnation liquid containing a formaldehyde oxidation catalyst at an atomized particle size, the filter body is transported by a conveying belt, and the impregnation liquid coverage is greater than or equal to 95%.

[0012] The dynamic drying process is that: the impregnated filter body continuously passes through seven groups of temperature zone tunnel ovens and sequentially experiences:

[0013] Preheating, 60-70℃, 1-2min;

[0014] Surface drying, 75-85℃, 1-2min;

[0015] Main drying I, 90-105℃, 3-4min;

[0016] Main drying II, 110-125℃, 5-8min;

[0017] Stepwise solidification, 130℃-160℃, 4-8min;

[0018] Slow cooling, 80℃-50℃, 2-3min;

[0019] Forced cooling, normal temperature strong wind, 1-2min.

[0020] Preferably, the performance parameters of the special activated carbon paper meet: the weight is 180-200g / m2, the carbon content is greater than or equal to 40-50%, the thickness is 0.45±0.05mm, the activated carbon iodine value is greater than or equal to 1100, the tensile strength is greater than or equal to 50N in the longitudinal direction and greater than or equal to 40N in the transverse direction, the stiffness is greater than or equal to 5, the carbon content and the 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 the stiffness ensure that the main structure is not easily damaged during processing and use, and the thickness tolerance control ensures the uniformity of the corrugated honeycomb structure.

[0021] Preferably, the solid content of the environment-friendly adhesive is greater than or equal to 50%, and the viscosity is greater than or equal to 60 centipoise, and the solid content and the viscosity parameters ensure that the adhesive can be uniformly attached to the surface of the special activated carbon paper during composite processing, and after solidification, the corrugated structures can be firmly combined to avoid the phenomenon of adhesive opening during use.

[0022] Preferably, the corrugation pitch of the corrugated honeycomb structure is 7.5±0.3mm, and the tolerance control of the corrugation pitch can ensure the uniformity of airflow in the honeycomb channel, avoiding harmful gas not being fully contacted with the functional layer due to local airflow being too fast.

[0023] Preferably, the deodorization efficiency of the harmful gas scavenger functional layer to acetaldehyde, acetic acid, ammonia, toluene and formaldehyde in the air is ≥99.9%, which is achieved by the uniform loading of the functional layer and the adsorption performance of the activated carbon substrate in the impregnation-drying process.

[0024] A processing device of a harmful gas purification filter, comprising an impregnation device and a drying device, the impregnation device is used to realize the processing of the impregnation process, and the drying device is used to realize the processing of the dynamic drying process.

[0025] The impregnation device comprises a spraying chamber, a nozzle array and a conveyor belt. The spraying chamber is made of transparent material and is used to accommodate the filter body and the nozzle array, preventing the liquid medicine from splashing outside the equipment and observing the spraying situation. The nozzle array is arranged in a closed cavity and distributed on the upper and lower sides of the filter body, used to spray the impregnation liquid containing formaldehyde oxidation catalyst. The conveyor belt adopts chain transmission, penetrates through the closed cavity and connects the drying device, used to convey the filter body and make the filter body pass through the closed cavity smoothly to the drying device.

[0026] The drying device comprises 16 tunnel ovens, which are divided into 7 groups. Among them: 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, used to realize the pre-heating, surface drying, main drying I, main drying II, step curing, slow cooling and forced cooling of the dynamic drying process of claim 1 in turn.

[0027] Preferably, the first group of tunnel ovens is the pre-heating area, used to balance the temperature of the filter body to 60-70℃, avoiding the boiling and splashing of the impregnation liquid caused by the sudden high temperature of the cold filter screen, and the processing time is 1-2min.

[0028] Preferably, the second group of tunnel ovens is the surface drying area, used to evaporate the surface layer of the impregnation liquid in a 75-85℃ environment, preventing the dripping liquid from polluting the conveyor belt, and the processing time is 1-2min.

[0029] Preferably, the third group of tunnel type ovens is the main drying I area, which is used to place the filter body in an environment of 90-105 DEG C for medium temperature deep drying, so that the impregnating liquid penetrates into the internal pores of the activated carbon, and the treatment time is 3-4 min;

[0030] The fourth group of tunnel type ovens is the main drying II area, which is used to place the filter body in an environment of 110-125 DEG C for high temperature strengthening drying, so as to completely remove the residual solvent to ensure that the specific surface area of the activated carbon is completely exposed, and the treatment time is 5-8 min;

[0031] The fifth group of tunnel type ovens is the ladder curing area, which is used to place the filter body in an environment of gradient temperature rising from 130 DEG C to 140 DEG C, 140 DEG C to 150 DEG C and 150 DEG C to 160 DEG C, so as to activate the chemical catalyst and form stable chemical bonds, and the treatment time is 4-8 min.

[0032] Preferably, the sixth group of tunnel type ovens is the slow cooling area, which is used to place the filter body in an environment of gradient temperature falling from 80 DEG C to 50 DEG C, so as to prevent the high-temperature filter screen from cracking due to sudden cooling and release internal stress, and the treatment time is 2-3 min;

[0033] The seventh group of tunnel type ovens is the forced cooling area, which is used to rapidly cool the filter body to room temperature by using normal temperature strong wind, so as to facilitate subsequent winding and cutting, and the treatment time is 1-2 min.

[0034] Compared with the prior art, the present application has the following beneficial effects:

[0035] 1. The present application realizes the uniform loading and stable combination of the harmful gas removal agent functional layer on the surface and internal pores of the filter body by using the impregnation-drying process, solves the problem of rapid purification performance decay caused by uneven distribution and weak combination of the catalyst functional layer of the traditional filter, and improves the continuous purification capacity of the filter for harmful gases;

[0036] 2. The present application realizes the high-efficiency adsorption function of harmful gases such as acetaldehyde and formaldehyde by using the special activated carbon paper and corrugated honeycomb structure meeting specific parameters, solves the problems of limited adsorption capacity of the traditional activated carbon and low adsorption efficiency for polar gases, and improves the adsorption capacity and purification efficiency of the filter;

[0037] 3. The present application realizes the firm composite function between the corrugations of the filter body by using the environmental protection adhesive with solid content ≥ 50% and viscosity ≥ 60 centipoise, solves the phenomenon of easy opening of the traditional filter during use, and improves the structural stability and service life of the filter;

[0038] 4. The application realizes gradient drying and curing of the filter body after impregnation through seven groups of tunnel ovens of the drying device, solves the problems of residual solvent affecting the pore of activated carbon and high temperature destroying the activity of the catalyst in the traditional drying process, and improves the synergistic effect and long-term stability of the adsorption and catalytic performance of the filter. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 The filter of the application. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the application.

[0041] In the description of the application, it should be noted that the terms 'upper', 'lower', 'inner', 'outer', 'front end','rear end', 'two ends', 'one end', 'the other end' and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application. In addition, the terms 'first' and'second' are only for the purpose of description and cannot be understood as indicating or implying relative importance.

[0042] In the description of the application, it should be noted that unless otherwise explicitly specified and limited, the terms'mounting', 'provided with', 'connection' and the like should be understood broadly, for example, 'connection' can be fixed connection, can also be detachable connection, or integral connection; can be mechanical connection, can also be electrical connection; can be direct connection, can also be indirect connection through an intermediate medium, and can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0043] Embodiment 1

[0044] Please refer to Figure 1 The application provides an embodiment: a harmful gas purification filter and processing device, the filter preparation raw materials and processing parameters are as follows:

[0045] Special activated carbon paper: weight 190g / m 2 , carbon content 45%, thickness 0.45mm, iodine value 1150, tensile strength longitudinal 55N, transverse 42N, stiffness 6, appearance black, surface smooth without damage;

[0046] Eco-friendly adhesive: solid content 52%, viscosity 65 centipoise, packaged in plastic barrels;

[0047] Corrugated honeycomb structure: corrugation pitch 7.5 mm, size 735 x 463 x 5 mm, flat plate shape;

[0048] Harmful gas scavenger functional layer: loaded by impregnation-drying process, impregnation solution contains formaldehyde oxidation catalyst, impregnation coverage 96%;

[0049] Dynamic drying process: sequentially through 7 groups of tunnel ovens, specific parameters:

[0050] First group, pre-heating: 65°C, total duration 1.5 min;

[0051] Second group, surface drying: 80°C, total duration 1.5 min;

[0052] Third group, main drying I: 100°C, total duration 3.5 min;

[0053] Fourth group, main drying II: 120°C, total duration 6 min;

[0054] Fifth group, step curing: gradient temperature rise according to 130°C, 140°C, 150°C, 160°C, each oven increases by 10°C, total duration 6 min;

[0055] Sixth group, slow cooling section: gradient temperature drop according to 80°C, 50°C, two ovens are 80°C and 50°C in turn, total duration 2.5 min;

[0056] Seventh group, forced cooling: normal temperature strong wind, total duration 1.5 min;

[0057] Processing steps:

[0058] S1, place the formed corrugated honeycomb structure in the feed inlet of the transparent spraying chamber, start the chain conveyor belt, speed 0.5 m / min, the filter body enters the cavity with the conveyor belt;

[0059] S2, open the nozzle array, 3 nozzles up and down, staggered position, spray impregnation solution containing formaldehyde oxidation catalyst, the filter body passes through the cavity for 2 min, the impregnation solution coverage reaches 96%, and then enters the drying device after being discharged from the discharge port;

[0060] S3, the filter body enters the first tunnel oven, the temperature is set to 65°C, the conveyor belt speed is kept at 0.5 m / min, and the residence time is 1.5 min, the filter body temperature is balanced to 60-65°C to avoid impregnation solution splashing caused by subsequent high temperature;

[0061] S4, into the No. 2 tunnel oven, temperature 80℃, stay 1.5min, evaporate the surface moisture of the impregnation liquid, detect the surface dryness to reach more than 90%, no dripping phenomenon;

[0062] S5, into the No. 3, 4 tunnel ovens, temperature 100℃, total stay 3.5min, 1.75min per oven, through the medium temperature to make the impregnation liquid penetrate into the internal pores of the activated carbon, the penetration depth reaches 120μm;

[0063] S6, into the No. 5, 6, 7, 8 tunnel ovens, temperature 120℃, total stay 6min, 1.5min per oven, completely remove the residual solvent, the residual amount is less than or equal to 0.01%, the specific surface area of the activated carbon is completely exposed;

[0064] S7, into the No. 9, 10, 11, 12 tunnel ovens, the temperature is 130℃, 140℃, 150℃, 160℃ in turn, each oven increases by 10℃, total stay 6min, 1.5min per oven, activate the formaldehyde oxidation catalyst, form a stable chemical bond, and the catalytic activity is increased to 1.2 times of the initial value;

[0065] S8, into the No. 13, 14 tunnel ovens, the temperature is 80℃, 50℃ in turn, total stay 2.5min, 1.25min per oven, release the internal stress, avoid the substrate cracking;

[0066] S9, into the No. 15, 16 tunnel ovens, open the normal temperature strong wind, the wind speed is 10m / s, total stay 1.5min, 0.75min per oven, cool to room temperature.

[0067] Example 2

[0068] Please refer to Figure 1 , the present application provides an embodiment: a harmful gas purification filter and processing device, the difference between the embodiment and example 1 is that the filter preparation raw material and processing process parameters are as follows:

[0069] Special activated carbon paper: weight 190g / m 2 , carbon content 35%, thickness 0.45mm, iodine value 1150, tensile strength longitudinal 55N, transverse 42N, stiffness 6, appearance black, surface smooth without damage;

[0070] Environment-friendly adhesive: solid content 48%, viscosity 55 centipoise, packaged with plastic barrels;

[0071] Corrugated honeycomb structure: corrugation spacing 7.5mm, size 735x463x5mm, flat plate shape;

[0072] Harmful gas scavenger functional layer: loaded by impregnation-drying process, the impregnation liquid contains formaldehyde oxidation catalyst, impregnation coverage rate 96%.

[0073] Example 3

[0074] Referring to Figure 1 , the present application provides an embodiment: a harmful gas purification filter and processing device, the difference between this embodiment and embodiment 1 is that the filter preparation raw materials and processing parameters are as follows:

[0075] Special activated carbon paper: weight 190g / m 2 , carbon content 45%, thickness 0.45mm, iodine value 1150, tensile strength longitudinal 55N, transverse 42N, stiffness 6, appearance black, surface smooth without damage;

[0076] Environment-friendly adhesive: solid content 52%, viscosity 65 centipoise, packaged with plastic barrels;

[0077] Corrugated honeycomb structure: corrugation spacing 7.9mm, size 735x463x5mm, flat plate shape;

[0078] Harmful gas scavenger functional layer: loaded by impregnation-drying process, impregnation solution contains formaldehyde oxidation catalyst, impregnation coverage 94%.

[0079] Example 4

[0080] Referring to Figure 1 , the present application provides an embodiment: a harmful gas purification filter and processing device, the difference between this embodiment and embodiment 1 is that the filter preparation raw materials and processing parameters are as follows:

[0081] Special activated carbon paper: weight 190g / m 2 , carbon content 45%, thickness 0.51mm, iodine value 1050, tensile strength longitudinal 55N, transverse 42N, stiffness 4, appearance black, surface smooth without damage;

[0082] Environment-friendly adhesive: solid content 52%, viscosity 65 centipoise, packaged with plastic barrels;

[0083] Corrugated honeycomb structure: corrugation spacing 7.5mm, size 735x463x5mm, flat plate shape;

[0084] Harmful gas scavenger functional layer: loaded by impregnation-drying process, impregnation solution contains formaldehyde oxidation catalyst, impregnation coverage 96%.

[0085] Example 5

[0086] Referring to Figure 1 , the present application provides an embodiment: a harmful gas purification filter and processing device, the difference between this embodiment and embodiment 1 is that the filter preparation raw materials and processing parameters are as follows:

[0087] Special activated carbon paper: weight 190g / m 2 , carbon content 45%, thickness 0.45mm, iodine value 1150, tensile strength longitudinal 55N, transverse 42N, stiffness 6, appearance black, surface smooth without damage;

[0088] Environment-friendly adhesive: solid content 52%, viscosity 65 centipoise, packaged with plastic barrels;

[0089] Corrugated honeycomb structure: corrugation spacing 7.5mm, size 735x463x5mm, flat plate shape;

[0090] Harmful gas scavenger functional layer: loaded by immersion-drying process, immersion liquid containing formaldehyde oxidation catalyst, immersion coverage 96%;

[0091] Dynamic drying process: sequentially through 7 groups of tunnel ovens, specific parameters:

[0092] First group, preheating: 65℃, total duration 1.5min;

[0093] Second group, surface drying: 80℃, total duration 1.5min;

[0094] Third group, main drying I: 100℃, total duration 3.5min;

[0095] Fourth group, main drying II: 105℃, total duration 4min;

[0096] Fifth group, step curing: gradient heating according to 120℃, 130℃, 140℃, 150℃, each oven increasing by 10℃, total duration 3min;

[0097] Sixth group, slow cooling section: gradient cooling according to 80℃, 50℃, two ovens sequentially at 80℃, 50℃, total duration 2.5min;

[0098] Seventh group, forced cooling: normal temperature strong wind, total duration 1.5min.

[0099] Example 6

[0100] Please refer to Figure 1 , the present application provides an embodiment: a harmful gas purification filter and processing device, the difference between the present embodiment and example 1 is that the filter preparation raw material and processing parameters are as follows:

[0101] Special activated carbon paper: weight 190g / m 2 , carbon content 45%, thickness 0.45mm, iodine value 1150, tensile strength longitudinal 55N, transverse 42N, stiffness 6, appearance black, surface smooth without damage;

[0102] Eco-friendly adhesive: solid content 52%, viscosity 65 centipoise, packaged in plastic barrels;

[0103] Corrugated honeycomb structure: corrugation pitch 7.5 mm, size 735 x 463 x 5 mm, flat plate shape;

[0104] Harmful gas scavenger functional layer: loaded by impregnation-drying process, impregnation solution containing formaldehyde oxidation catalyst, impregnation coverage 96%;

[0105] Dynamic drying process: sequentially through 7 groups of tunnel ovens, specific parameters:

[0106] First group, pre-heating: 65℃, total duration 1.5 min;

[0107] Second group, surface drying: 80℃, total duration 1.5 min;

[0108] Third group, main drying I: 85℃, total duration 2 min;

[0109] Fourth group, main drying II: 120℃, total duration 6 min;

[0110] Fifth group, step curing: gradient heating according to 130℃, 140℃, 150℃, 160℃, each oven increasing by 10℃, total duration 6 min;

[0111] Sixth group, slow cooling section: gradient cooling according to 80℃, 50℃, two ovens sequentially at 80℃, 50℃, total duration 2.5 min;

[0112] Seventh group, forced cooling: normal temperature strong wind, total duration 1.5 min.

[0113] Example 7

[0114] Please refer to Figure 1 , the present application provides an embodiment: a harmful gas purification filter and processing device, the difference between the present embodiment and example 1 is that the filter preparation raw materials and processing parameters are as follows:

[0115] Special activated carbon paper: weight 190g / m 2 , carbon content 45%, thickness 0.45mm, iodine value 1150, tensile strength longitudinal 55N, transverse 42N, stiffness 6, appearance black, surface smooth without damage;

[0116] Eco-friendly adhesive: solid content 52%, viscosity 65 centipoise, packaged in plastic barrels;

[0117] Corrugated honeycomb structure: corrugation pitch 7.5 mm, size 735 x 463 x 5 mm, flat plate shape;

[0118] Harmful gas scavenger functional layer: loaded by dip-dry process, the dip solution contains formaldehyde oxidation catalyst, dip coverage 96%;

[0119] Dynamic drying process: sequentially through 7 groups of tunnel ovens, specific parameters:

[0120] First group, preheating: 55°C, total duration 0.5 min;

[0121] Second group, surface drying: 80°C, total duration 1.5 min;

[0122] Third group, main drying I: 100°C, total duration 3.5 min;

[0123] Fourth group, main drying II: 120°C, total duration 6 min;

[0124] Fifth group, step curing: gradient heating at 130°C, 140°C, 150°C, 160°C, each oven increases by 10°C, total duration 6 min;

[0125] Sixth group, slow cooling section: gradient cooling at 80°C, 50°C, two ovens are 80°C and 50°C in turn, total duration 2.5 min;

[0126] Seventh group, forced cooling: normal temperature strong wind, total duration 1.5 min.

[0127] Experiment one

[0128] Deodorization performance test of the harmful gas purification filter of example 1 before and after processing:

[0129] 1, experimental equipment: 8m 3 Experimental box;

[0130] 2, detection method: 8m 3 The experimental box is injected with a certain amount of five gases, acetaldehyde, acetic acid, ammonia, toluene and formaldehyde. After injection, start the air purifier for 30 minutes, then analyze the gas composition in the experimental box with a Fourier transform infrared spectrometer;

[0131] 3, experimental results: detailed results are shown in table 1 before processing and table 2 after processing:

[0132] Table 1: test results before processing

[0133]

[0134] Table 2: test results after processing

[0135]

[0136] Experiment two

[0137] The deodorization performance comparison test was performed on the harmful gas purification filters of Examples 1-7:

[0138] 1. Experimental equipment: 8m 3 Experimental box;

[0139] 2. Detection method: 8m 3 A certain amount of five gases, acetaldehyde, acetic acid, ammonia, toluene and formaldehyde, were injected into the experimental box, and then the air purifier was started 30 minutes after injection. The gas composition in the experimental box was analyzed by Fourier transform infrared spectrometer;

[0140] 3. Experimental results: see Table 3 for detailed results Deodorization performance comparison:

[0141] Table 3 Deodorization performance comparison

[0142]

[0143] 1. In Experiment 1, the 30-minute removal efficiency of the processed product for each gas was significantly better than that of the product before processing at each detection time point. The total removal efficiency of the processed product was significantly improved compared with that of the product before processing.

[0144] 2. In Experiment 2, the removal efficiency of each gas of Example 1 group was better than that of other example groups after 30 minutes of detection. The removal efficiency of each gas of other example groups deviated from the parameters and could not achieve the removal efficiency of Example 1 group.

[0145] In summary, under the conditions of this experiment, the experimental product has the effect of efficiently and stably purifying acetaldehyde, acetic acid, ammonia, toluene and formaldehyde harmful gases.

[0146] It is apparent to those skilled in the art that the present application is not limited to the details of the foregoing exemplary embodiments, but can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all respects as illustrative and not restrictive, and the scope of the present application should be defined by the appended claims rather than the above description, and it is intended to encompass all changes falling within the meaning and range of equivalents of the claims. Any reference signs in the claims should not be considered as limiting the claims involved.

Claims

1. A filter for purifying harmful gases, characterized by: The filter body is a corrugated honeycomb flat product, which is composed of special activated carbon paper and environment-friendly adhesive, and a harmful gas scavenger functional layer is loaded on the surface and internal pores of the filter body, and the functional layer is formed by an immersion-drying process. The immersion-drying process comprises an immersion process and a dynamic drying process. In the immersion process, the formed filter body is placed in a spraying chamber, a nozzle array is used to spray the immersion liquid containing formaldehyde oxidation catalyst with atomized particles, the filter body is transported by a conveying belt, and the immersion liquid coverage is greater than or equal to 95%. In the dynamic drying process, the immersed filter body continuously passes through seven groups of temperature zone tunnel ovens, and sequentially experiences: pre-heating at 60-70 DEG C for 1-2 min; surface drying at 75-85 DEG C for 1-2 min; main drying I at 90-105 DEG C for 3-4 min; main drying II at 110-125 DEG C for 5-8 min; ladder curing at 130 DEG C-160 DEG C for 4-8 min; slow cooling at 80 DEG C-50 DEG C for 2-3 min; forced cooling at room temperature with strong wind for 1-2 min.

2. The filter according to claim 1, wherein: The performance parameters of the special activated carbon paper meet: weight 180-200 g / m 2 , carbon content ≥40-50%, thickness 0.45±0.05 mm, activated carbon iodine value ≥1100, tensile strength longitudinal ≥50 N, transverse ≥40 N, stiffness ≥5, carbon content and iodine value jointly ensure the adsorption capacity of activated carbon to acetaldehyde, acetic acid, ammonia, toluene and formaldehyde harmful gases, the tensile strength and stiffness ensure that the main structure is not easy to be damaged in the process of processing and use, and the thickness tolerance control ensures the uniformity of the corrugated honeycomb structure.

3. The filter according to claim 1, wherein: The solid content of the environment-friendly adhesive is greater than or equal to 50%, and the viscosity is greater than or equal to 60 centipoise, so that the adhesive can be uniformly attached to the surface of the special activated carbon paper during the compounding process, and the corrugated honeycomb structure can be firmly combined after curing, thereby avoiding the phenomenon of adhesive opening during use.

4. The filter according to claim 1, wherein: The corrugated honeycomb structure has a corrugation spacing of 7.5±0.3 mm, and the tolerance control of the corrugation spacing can ensure the uniformity of the airflow in the honeycomb channel, thereby avoiding the harmful gas from not being fully contacted with the functional layer due to the local airflow being too fast.

5. The filter according to claim 1, wherein: The harmful gas scavenger functional layer has a deodorization efficiency of greater than or equal to 99.9% for acetaldehyde, acetic acid, ammonia, toluene and formaldehyde in the air, and the efficiency is achieved by the uniform loading of the functional layer and the adsorption performance of the activated carbon substrate in the immersion-drying process.

6. A processing apparatus for a harmful gas purification filter, applicable to the harmful gas purification filter described in claim 1, characterized in that: The immersion device is used to realize the immersion process, and the drying device is used to realize the dynamic drying process. The spraying chamber is made of transparent material and is used to accommodate the filter body and the nozzle array, so as to prevent the liquid medicine from splashing outside the equipment and observe the spraying situation. The nozzle array is arranged in a closed cavity and distributed on the upper and lower sides of the filter body, and is used to spray the immersion liquid containing formaldehyde oxidation catalyst. The conveying belt is chain conveying, penetrates through the closed cavity and is connected with the drying device, and is used to convey the filter body and make the filter body pass through the closed cavity to the drying device. The drying device comprises 16 tunnel ovens, which are divided into 7 groups, wherein: 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, and the seven groups of tunnel ovens correspond to seven functional areas for realizing the pre-heating, surface drying, main drying I, main drying II, step curing, slow cooling and forced cooling of the dynamic drying process in sequence.

7. The apparatus according to claim 6, wherein: The first group of tunnel ovens is a pre-heating area for balancing the filter body temperature to 60-70 DEG C, avoiding the boiling and splashing of the impregnating liquid caused by the sudden high temperature of the cold filter screen, and the processing time is 1-2 min.

8. The apparatus according to claim 6, wherein: The second group of tunnel ovens is a surface drying area for placing the filter body in a 75-85 DEG C environment to evaporate the surface layer of the solvent in the impregnating liquid, preventing liquid pollution of the conveying belt, and the processing time is 1-2 min.

9. The apparatus for processing a filter for purifying harmful gas according to claim 6, wherein: The third group of tunnel ovens is a main drying I area for placing the filter body in a 90-105 DEG C environment for medium-temperature deep drying, so that the impregnating liquid penetrates into the internal pores of the activated carbon, and the processing time is 3-4 min. The fourth group of tunnel ovens is a main drying II area for placing the filter body in a 110-125 DEG C environment for high-temperature intensive drying to completely remove residual solvents to ensure complete exposure of the specific surface area of the activated carbon, and the processing time is 5-8 min. The fifth group of tunnel ovens is a step curing area for placing the filter body in a gradient heating environment from 130 DEG C to 140 DEG C, 140 DEG C to 150 DEG C and 150 DEG C to 160 DEG C to activate the chemical catalyst and form stable chemical bonds, and the processing time is 4-8 min.

10. The apparatus according to claim 6, wherein: The sixth group of tunnel ovens is a slow cooling area for placing the filter body in a gradient cooling environment from 80 DEG C to 50 DEG C to prevent the high-temperature filter screen from cracking and releasing internal stress, and the processing time is 2-3 min. The seventh group of tunnel ovens is a forced cooling area for high-speed cooling the filter body to room temperature by using normal temperature strong wind, which is convenient for subsequent winding and cutting, and the processing time is 1-2 min.

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