CN113577940A - Filling type filter screen, air purifier and regeneration method of filter material - Google Patents
Filling type filter screen, air purifier and regeneration method of filter material Download PDFInfo
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- CN113577940A CN113577940A CN202110965444.9A CN202110965444A CN113577940A CN 113577940 A CN113577940 A CN 113577940A CN 202110965444 A CN202110965444 A CN 202110965444A CN 113577940 A CN113577940 A CN 113577940A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/30—Particle separators, e.g. dust precipitators, using loose filtering material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/42—Auxiliary equipment or operation thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8668—Removing organic compounds not provided for in B01D53/8603 - B01D53/8665
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/70—Non-metallic catalysts, additives or dopants
- B01D2255/702—Carbon
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Abstract
The invention provides a filling type filter screen, an air purifier and a regeneration method of a filter material, wherein the filter screen comprises a filter screen shell and a precious metal loaded active carbon filter material or a non-precious metal oxide loaded active carbon filter material, and the active carbon filter material is detachably connected with the filter screen and is used for being washed and dried and then being filled back into the filter screen; the regeneration method of the filter material is water washing. The invention has the advantages that: the mode that loads through the filter material cooperates with the mode of water washing to make matters such as acetic acid, ammonia, formate that accumulate in the catalyst dissolve in water, and the filterable mode of rethread is got rid of to realize the regeneration of filter material, prolong the life of air purifier filter screen, avoid frequently changing the filter screen, reduced air purifier's use cost.
Description
Technical Field
The invention belongs to the field of air purifiers, and particularly relates to a filling type filter screen, an air purifier and a regeneration method of a filter material.
Background
Formaldehyde (HCHO) is a common volatile organic compound in indoor air and seriously harms human health, so that the method has very important research significance on removal and treatment of formaldehyde pollution in the indoor air. The existing filter screen for the air purifier mainly comprises activated carbon, formaldehyde is removed from a pure activated carbon filter material mainly by virtue of adsorption, the service life of the filter screen is limited by adsorption saturation, and once the activated carbon reaches adsorption saturation, toxic substances can be generated to harm human health.
The formaldehyde can be completely converted into nontoxic and harmless CO by a catalytic oxidation technology2And H2O, and the process can be realized under the normal temperature condition without additional energy input, and has important significance for prolonging the service life of the filter screen, so that the existing formaldehyde catalytic filter material adopting noble metal loaded on the activated carbon is developed and applied.
However, in the process of using the noble metal loaded active carbon filter material, due to the complexity of the air of the home environment, the problems that the purifying effect of the filter material is poor, the filter screen generates peculiar smell and the like are still easily caused. The poor purification effect is caused by the slow reaction of the formaldehyde catalytic filter material, because the accumulation of the intermediate formate of the catalytic reaction causes the interruption of the whole catalytic reaction chain, thereby causing the failure of the formaldehyde catalytic activated carbon filter material.
According to research data, the filter screen generates peculiar smell due to two reasons, namely, the peculiar smell is caused by accumulation of stink substances such as acetic acid, ammonia and the like adsorbed in the filter screen due to the adsorption performance of the activated carbon filter material; secondly, most filter type air purifier's filter screen adopts the mode of beating the glue with the active carbon filter material to fix on filter screen substrate pp or PET, and shows according to the data that the introduction of glue also is one of the important reasons that leads to the filter screen to appear the peculiar smell problem.
Therefore, the current precious metal loaded active carbon filter material is limited by the service life, the existing mode is only solved by replacing the filter screen, and the frequency of filter screen replacement is more frequent for users with poor home air environment, so that the use cost of the air purifier of the users is increased, and the popularization of the air purifier is not facilitated.
Disclosure of Invention
The invention provides a filling type filter screen, an air purifier and a regeneration method of a filter material, aiming at the problems that the purification effect of a noble metal loaded active carbon filter material is poor, peculiar smell is generated, the filter screen needs to be integrally replaced, and the use cost of a user is increased in the prior art.
The technical scheme of the invention is as follows:
a filling type filter screen comprises a filter screen shell and an active carbon filter material, wherein the active carbon filter material is detachably connected with the filter screen, is a noble metal loaded active carbon filter material or a non-noble metal oxide loaded active carbon filter material, and can be washed and dried and then is filled back into the filter screen.
Further, the filter screen shell comprises a grid cover and a honeycomb grid disc, the honeycomb grid disc is used for containing filter materials, and the grid cover and the honeycomb grid disc are detachably connected.
Furthermore, a plurality of cylindrical holes are arranged on the honeycomb grid disc and used for fixing the active carbon filter material.
Furthermore, the active carbon filter material is columnar, the granularity is phi 2-phi 4mm, and is larger than the aperture of the cylindrical hole.
Furthermore, the grid cover is hinged with one side of the honeycomb grid plate, and the other side of the honeycomb grid plate is in clamping connection.
Furthermore, the upper grid cover is provided with a buckle, the lower cellular grid plate is provided with a clamping hole, and the buckle and the clamping hole are matched for clamping.
Furthermore, buckle and block hole set up at the both ends of last net lid and cellular network dish block one side down.
An air purifier comprises the filling type filter screen.
A method of regenerating a filter material, comprising the steps of:
s1, taking out the used invalid precious metal loaded activated carbon filter material or non-precious metal oxide loaded activated carbon filter material from the filling filter screen;
s2, placing the activated carbon filter material in the S1 into a container, and washing with water;
s3, filtering the washed activated carbon filter material and drying;
and S4, filling the dried activated carbon filter material into a filter screen.
Further, the water washing manner in step S2 includes: and carrying out ultrasonic washing or stirring washing for 1-4 times.
The invention has the advantages that: the mode that loads through the filter material cooperates with the mode of water washing to make matters such as acetic acid, ammonia, formate that accumulate in the active carbon filter material dissolve in water, and the filterable mode of rethread is got rid of to realize the regeneration of filter material, prolong the life of air purifier filter screen, avoid frequently changing the filter screen, reduced air purifier's use cost.
Drawings
FIG. 1 is an expanded front view of a filled screen;
FIG. 2 is an expanded left side view of the loaded screen;
fig. 3 shows a snap-fit of a filled filter screen.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to solve the problems that the existing precious metal loaded active carbon filter material has poor purification effect, generates peculiar smell and needs to replace a filter screen integrally, the invention provides a solution scheme mainly through two aspects.
On one hand, the combination mode between the precious metal loaded activated carbon filter material and the filter screen is changed, and the filling mode is changed from the mode that the filter material is fixed on the filter screen base material pp or PET in a gluing mode, so that the precious metal loaded activated carbon filter material can be poured out and refilled; the step of gluing is reduced, the introduction of glue is avoided, and the risk of peculiar smell generated by the filter screen is reduced.
On the other hand, the regeneration mode of the filter material is provided, when the purification effect of the filter material is poor, the filter material can be taken out by a user, the adsorption performance of the filter material is recovered after cleaning, and the filter material can be continuously used after being filled and returned, so that the service life of the filter material is prolonged.
The filter material in the invention is made of noble metal (Pt, Au, Ag, etc.) or non-noble metal oxide (Co)3O4、MnOx、CeO2Etc.) or the noble metal and the non-transition metal oxide are loaded on the active carbon together, the mode of removing the formaldehyde is catalytic decomposition, and the active carbon filter material obtained by adopting various chemical additives is not suitable for the method.
The specific filling mode is as shown in fig. 1 and 2, the filter screen is integrally designed to be detachable and comprises a filter screen shell and detachable active carbon filter materials, and the filter screen shell is in a clamping type and comprises a grid cover 1 and a cellular grid disc 2. The mesh cover 1 is of a silk-screen structure and used for air permeation, and the mesh cover 1 is provided with a buckle 11 used for clamping the mesh cover 1 and the cellular mesh disc 2.
The honeycomb grid plate 2 is provided with a certain thickness and a plurality of cylindrical holes 21, the honeycomb grid plate can be arranged in a honeycomb manner as a whole, the diameter of each cylindrical hole 21 is phi 2-phi 4mm, the cylindrical holes are used for fixing the columnar active carbon filter material, and the honeycomb grid plate 2 is further provided with clamping holes 22 matched with the buckles 11.
Specifically, the active carbon filter material is a columnar active carbon filter material, the granularity of the columnar active carbon filter material is phi 2-phi 4mm, and the granularity of the columnar active carbon filter material is slightly larger than the aperture of the cylindrical hole 21 so as to prevent the filter material from falling.
As shown in fig. 3, the grid cover 1 is hinged to one end of the cellular grid plate 2, and the columnar activated carbon filter material is filled in the filter screen and clamped tightly through the clamping of the buckle 11 and the clamping hole 22. The buckles 11 and the clamping holes 22 are arranged at two ends of one side of the mesh cover and the cellular mesh plate in a clamping mode, and a group of buckles 11 and clamping holes 22 can be additionally arranged in the centers of the mesh cover 1 and the cellular mesh plate 2 for reinforcing the clamping effect.
When the filter is required to be opened, the columnar active carbon filter material can be taken out through the separation of the buckle 11 and the clamping hole 22; after the columnar active carbon filter material is regenerated, the active carbon can be filled back into the grid disc 2, and the grid cover 1 is covered to realize continuous use of the filter screen.
The regeneration method of the filter material is water washing, and the specific water washing mode comprises the following steps: ultrasonic washing, simple agitation washing. The washing times are 1-4 times, and are determined according to the service time of the filter material. The drying mode after the filter material is washed comprises the following steps: naturally drying, sun drying, and oven drying.
Through the water washing mode, the floating ash and the adsorbed NH covered on the surface of the filter material can be removed3And odor substances such as acetic acid and the like, and simultaneously, substances such as acetic acid, ammonia, formate and the like accumulated in the catalyst are desorbed and dissolved in water and are removed in a repeated washing and filtering mode, so that the aim of regenerating the active carbon filter material is fulfilled.
The following examples illustrate the effects of the embodiments of the present invention by experimental tests.
Example 1
In practical use, after the air purifier provided with the formaldehyde filter screen is used for a period of time, which is generally about 3 months, the metal catalytic active center on the filter material is covered by dust and an intermediate, namely formate, generated by the reaction of metal and formaldehyde, so that the activity of the catalyst is reduced, and the filter material is invalid in use.
The filter screen for the experiment is a filter screen which is out of work after a formaldehyde CCM (formaldehyde accumulated purification amount) is tested by adopting a national standard method, namely, in a formaldehyde acceleration test, the CADR (formaldehyde clean air amount) of the formaldehyde of the whole machine is tested to be attenuated to be less than 50% of an initial value.
And transferring the activated carbon filter material in the filter screen into a container, adding clear water, soaking all the activated carbon filter material in the water, putting the container into an ultrasonic washer, washing for 10min by using ultrasonic waves, and then filtering. And repeatedly washing with clear water for 2 times, spreading the cleaned filter material on a flat plate, and drying in an oven to complete the regeneration of the filter material.
And uniformly filling the regenerated filter material into the honeycomb grid disc 2, and then buckling the grid cover 1. And (3) putting the recovered filter screen into a purifier complete machine for testing, and testing according to a testing method of the formaldehyde CADR of the air purifier GB/T18801-:
at 30m3In a stainless steel cabin, the environmental temperature is 25 +/-2 ℃, the relative humidity is 50 +/-10 percent, and a phenol reagent spectrophotometry method is adopted for testing. Taking a phenol reagent as an absorption liquid, sampling for 4min, sampling in a cross sampling mode, adding an ammonium ferric sulfate solution for color development after the test is finished, testing the absorbance by an ultraviolet spectrophotometer, converting into the concentration Ct of formaldehyde in the test chamber, obtaining a linear regression curve of the change of the concentration of the formaldehyde in the test chamber along with the change of time by lnCt, and obtaining a natural attenuation constant KeAnd the total attenuation constant KnCalculating the CADR value of formaldehyde by the following formula
Q＝60×(ke-kn)×V
In the formula: q is the clean air quantity (m) of formaldehyde3/h)；KeFor the natural decay constant (test without opening the purifier) (min)-1)；KnIs the total attenuation constant (min)-1) (ii) a V is the volume of the test chamber (m)3)
Thus obtaining the formaldehyde CADR value of the purifier, and the results of testing the overall formaldehyde CADR value of the air purifier before and after the regeneration of the filter material are shown in the following table:
TABLE 1 complete set formaldehyde CADR test for air purifier with ultrasonically washed filter material
| Serial number | State of filter screen | Type (B) | Test standards of experiment | Formaldehyde CADR (m)3/h) |
| 1 | Before regeneration | Air purifier | GB/T 18801-2015 | 56 |
| 2 | After regeneration | Air purifier | GB/T 18801-2015 | 146 |
The result shows that after the regeneration is carried out by the method, the CADR value of the formaldehyde of the whole air purifier is restored to a usable state from the original initial value which is lower than 50 percent, which shows that the method can effectively prolong the service life of the filter material.
Example 2
The adopted filter screen is a filter screen which is failed after formaldehyde CCM test by a national standard method, the filter material is poured into a container by uncovering a grid cover 1 of the filter screen, clear water capable of immersing the filter material is added, the filter material is stirred and washed by hands, then dirty water is filtered, after washing is repeated for three times, the cleaned filter material is laid on a flat plate and is placed under the sun for drying, and the regeneration of the filter material is completed.
And uniformly filling the regenerated filter material into the honeycomb grid disc 2, and then buckling the grid cover 1. The recovered filter screen is put into a complete purifier for testing, and the testing is carried out according to the testing method of the national standard GB/T18801-. The overall formaldehyde CADR value of the air purifier before and after filter material regeneration is respectively tested, and the results are shown in the following table:
TABLE 2 Formaldehyde CADR test for air purifier complete machine for washing filter material by stirring clear water
| Serial number | State of filter screen | Type (B) | Test standards of experiment | Formaldehyde CADR (m)3/h) |
| 1 | Before regeneration | Air purifier | GB/T 18801-2015 | 53 |
| 2 | After regeneration | Air purifier | GB/T 18801-2015 | 132 |
The result shows that after the filter material is cleaned and regenerated by the method of directly stirring and washing the clean water, the overall formaldehyde CADR of the overall air purifier is obviously improved, and the method is also effective and can effectively prolong the service life of the filter screen.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A filled filter screen, comprising: the filter screen comprises a filter screen shell and an active carbon filter material, wherein the active carbon filter material is detachably connected with the filter screen, is a noble metal loaded active carbon filter material or a non-noble metal oxide loaded active carbon filter material, and can be washed, dried and then filled back into the filter screen.
2. The loaded screen of claim 1, wherein: the filter screen shell comprises a grid cover and a honeycomb grid disc, the honeycomb grid disc is used for containing filter materials, and the grid cover and the honeycomb grid disc are detachably connected.
3. The loaded screen of claim 2, wherein: the honeycomb grid disc is provided with a plurality of cylindrical holes for fixing the active carbon filter material.
4. The loaded screen of claim 3, wherein: the active carbon filter material is columnar, has the granularity of phi 2-phi 4mm and is larger than the aperture of the cylindrical hole.
5. The loaded screen of claim 2, wherein: the grid cover is hinged with one side of the honeycomb grid disc, and the other side of the honeycomb grid disc is in clamping connection.
6. A filled screen according to any one of claims 2 to 5 wherein: the mesh cover is provided with a buckle, the cellular mesh disc is provided with a clamping hole, and the buckle is matched with the clamping hole to be clamped.
7. The loaded screen of claim 6, wherein: the buckle and the clamping hole are arranged at two ends of one side of the grid cover and the cellular grid disc in a clamping manner.
8. An air purifier, its characterized in that: comprising a filler sieve according to any one of claims 1 to 7.
9. A regeneration method of a normal-temperature formaldehyde catalytic filter material is characterized by comprising the following steps:
s1, taking out the used invalid precious metal loaded activated carbon filter material or non-precious metal oxide loaded activated carbon filter material from the filling filter screen;
s2, placing the activated carbon filter material in the S1 into a container, and washing with water;
s3, filtering the washed activated carbon filter material and drying;
and S4, filling the dried activated carbon filter material into a filter screen.
10. The method for regenerating a normal-temperature formaldehyde catalyst filter material as claimed in claim 9, wherein the water washing manner in step S2 includes: and carrying out ultrasonic washing or stirring washing for 1-4 times.
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