CN211189710U - Air purification system for degrading VOCs (volatile organic compounds) through catalytic oxidation - Google Patents
Air purification system for degrading VOCs (volatile organic compounds) through catalytic oxidation Download PDFInfo
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- CN211189710U CN211189710U CN201921223579.2U CN201921223579U CN211189710U CN 211189710 U CN211189710 U CN 211189710U CN 201921223579 U CN201921223579 U CN 201921223579U CN 211189710 U CN211189710 U CN 211189710U
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Abstract
The utility model discloses an air purification system of catalytic oxidation degradation VOCs. The air purification system includes: the air inducing device comprises a shell, an air inducing assembly arranged in the shell, an air inlet, an air outlet and a ventilating duct arranged on the shell; the ozone generating device is used for generating free oxygen radicals and ozone and degrading organic matters in the air containing VOCs into micromolecular compounds; the catalytic oxidation reaction device is used for enabling the air treated by the ozone generating device to be in contact with a transition metal catalyst in the presence of free oxygen radicals and ozone so as to catalytically oxidize and degrade VOCs molecules; the filtering and sterilizing device comprises a photocatalytic filtering component and activated carbon fibers, wherein the photocatalytic filtering component is loaded with active nano particles. The utility model discloses an air purification system can be under-10 ~ 40 ℃ can be high-efficiently clear up VOCs completely, the degree of depth, accomplish the degree of depth degradation purification purpose to the air.
Description
Technical Field
The utility model relates to a VOCs exhaust gas purification system, in particular to normal atmospheric temperature catalytic oxidation degradation VOCs's air purification system belongs to air purification technical field.
Background
VOCs (Volatile Organic Compounds) refer to Organic substances with saturated vapor pressure exceeding 133.32Pa at room temperature, the boiling point of the Organic substances is 50-250 ℃, the Organic substances can exist in the air in a form of evaporation at room temperature, and the toxic, irritant, carcinogenic and special odor properties of the Organic substances can affect skin and mucous membranes and cause acute damage to human bodies.
At present, the social economy is rapidly developed, but the air quality is reduced, and the concentration level of normal and non-industrial VOCs in the indoor environment is generally considered not to cause tumors and cancers of the human body. However, when the concentration of VOCs is 3.0-25mg/m3When the traditional Chinese medicine composition is used in combination with other factors, stimulation and discomfort can be generated, and when the traditional Chinese medicine composition is used in combination with other factors, a human body can have headache; when the concentration of VOCs is more than 25mg/m3Sometimes, in addition to headache, other neurotoxic effects may occur. For a semi-closed space formed by a semi-closed compartment cabin of a vehicle and the like, the personnel in the semi-closed space have high density and less activity, the materials used for cabin interior decoration can generate harmful substances and spread in the cabin, and the narrow space in the cabin causes low air circulation rate and difficult removal of pollutants. In a newly off-line carriage, the concentration of VOCs released in the coating process, decorative materials and the like is particularly serious. Therefore, there is a need to solve this problem.
Present current air purification device mostly only adopts the filter screen to carry out filtration purification to the air, but this kind of air purification device can not clear away the VOCs in the air, only filters air dust, to harmful gas's purification, adopts active carbon to adsorb mostly at present, but the active carbon adsorbs the saturation failure easily, and the actual use effect is unsatisfactory.
SUMMERY OF THE UTILITY MODEL
The main object of the utility model is to provide an air purification system of catalytic oxidation degradation VOCs to overcome not enough among the prior art.
In order to achieve the above object, the utility model discloses a technical scheme include:
the embodiment of the utility model provides an air purification system of catalytic oxidation degradation VOCs, it includes:
the induced draft device comprises a shell, an induced draft assembly arranged in the shell, an air inlet and an air outlet which are arranged on the shell, and a ventilation pipeline which enables the induced draft device, the ozone generating device, the catalytic oxidation reaction device and the filtering and sterilizing device to be communicated, and is at least used for enabling air containing VOCs to enter the ozone generating device;
an ozone generating device at least used for generating free oxygen free radicals and ozone and simultaneously degrading organic matters in the air containing VOCs into micromolecular compounds;
the catalytic oxidation reaction device is at least used for enabling the air treated by the ozone generating device to be in contact with a transition metal catalyst under the condition that free oxygen radicals and ozone exist, so that VOCs molecules are degraded through catalytic oxidation, and primary purified air is obtained;
the filtering and sterilizing device comprises a photocatalytic filtering component and activated carbon fibers, wherein the photocatalytic filtering component is loaded with active nano particles with sterilizing performance and is at least used for filtering and sterilizing the air purified for the first time to obtain air purified for the second time.
In some embodiments, the air purification system further comprises a detection control device for detecting and controlling at least the inlet VOCs concentration, the outlet VOCs concentration, the air temperature, the humidity, the power switch, the circulating air volume and the ultraviolet lamp intensity.
The embodiment of the utility model provides an application in VOCs purification treatment or air purification treatment field of aforementioned catalytic oxidation degradation VOCs's air purification system is still provided.
Compared with the prior art, the utility model has the advantages of:
the utility model provides an air purification system includes the induced air device, ozone generating device, catalytic oxidation reaction unit and filter sterilization device, the air purification method who provides can be high-efficiently complete with VOCs under the normal atmospheric temperature of-10 ~ 40 ℃, degree of depth is cleared up, mainly utilize ultraviolet lamp ozone generating device, ultraviolet irradiation gas produces active ingredient such as ozone and active oxygen free radical, catalytic oxidation reaction unit, catalytic oxidation reaction takes place further oxidative degradation VOCs component wherein of catalytic oxidation reaction at the catalyst bed, further purify through the filter sterilization device, accomplish the degree of depth degradation purification purpose to the air, can be used to sealed semi-closed carriage passenger cabin that exceeds standard, new line locomotive carriage, the room that new outfit was repaiied, contain VOCs airtight, half indoor space, need the life living, but the air VOCs purification treatment of unqualified space, and is also suitable for air purification treatment of indoor central air conditioners, fresh air systems and the like in hospitals, large-scale venues, families and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic view of the operation principle of an ultraviolet ozone generator according to an exemplary embodiment of the present invention.
Fig. 2 is a schematic structural diagram of an air purification system for catalytic oxidative degradation of VOCs according to an exemplary embodiment of the present invention.
Fig. 3 is a functional diagram of an ultraviolet ozone generator according to an exemplary embodiment of the present invention.
Fig. 4 is a diagram of the internal structure of a glass light-transmitting structure of an ultraviolet ozone generator according to an exemplary embodiment of the present invention.
Reference numerals: 1-an air inlet, 2-an induced draft fan, 3-an ultraviolet ozone generator, 31-an ultraviolet lamp box, 32-an ultraviolet lamp, 33-a partition plate, 3 a-an air inlet, 3 b-an air outlet, A-an air flow direction, 4-a catalytic oxidation reactor, 5-a filtering and sterilizing device, 6-a display, 7-an air outlet and 8-a shell.
Detailed Description
In view of the deficiencies in the prior art, the inventor of the present application has long studied and practiced in a large number of ways to provide the technical scheme of the present invention, which mainly relates to an air purification method and system for catalytic oxidation degradation of VOCs, wherein the method mainly comprises the steps of generating active free radicals and ozone through an ozone generating device, catalytically oxidizing and degrading VOCs components in gas at normal temperature, and then sterilizing and deodorizing a filter screen containing nano active components to complete air purification. The normal-temperature catalytic oxidation adopts transition metal oxide as a catalyst, and can deeply degrade most VOCs components by combining ozone at normal temperature to generate CO2And water. The air purification system assembled according to the method comprises an induced draft device, an ozone generating device, a normal-temperature catalytic oxidation device, a filtering sterilization device and the like. VOCs that can be treated include formaldehyde, benzene, toluene, xylene, ammonia, ethyl acetate, odors, pathogens, and the like. The technical solution, its implementation and principles, etc. will be further explained as follows.
The embodiment of the utility model provides an aspect provides a catalytic oxidation degrades VOCs's air purification method, and it includes:
(1) enabling the air containing the VOCs to enter an ozone generating device through an air inducing device, generating free oxygen radicals and ozone, and simultaneously degrading partial organic matters in the air containing the VOCs into micromolecular compounds;
(2) the air treated by the ozone generating device enters a catalytic oxidation reaction device and contacts with a catalyst in the presence of free oxygen radicals and ozone, so that VOCs molecules are degraded through catalytic oxidation to obtain primary purified air;
(3) and enabling the primarily purified air to enter a filtering and sterilizing device to obtain secondarily purified air, wherein the filtering and sterilizing device comprises a photocatalytic filtering component and activated carbon fibers, and the photocatalytic filtering component is loaded with active nano particles with sterilizing performance.
As one of the preferable embodiments, the ozone generating device is preferably an ultraviolet ozone generating device, and can be other ozone generating devices, and the ozone generating device is mixed into the air containing the VOCs component, and the latter catalyst can be catalyzed and oxidized and degraded at normal temperature.
Further, the ozone generating device preferably generates ozone and active free radicals by ultraviolet lamp irradiation; other ozone generating devices such as an ozone generator and the like can also be introduced into the system.
Further, the method comprises: the air containing VOCs enters the ultraviolet ozone generating device through the air inducing device, free oxygen radicals and ozone are generated under the action of ultraviolet light, and meanwhile, partial organic matters in the air containing VOCs are degraded into micromolecular compounds.
Further, the ultraviolet light is derived from UV254nm+185nmA vacuum ultraviolet lamp. The ultraviolet lamp light source is preferably UV254nm+185nmA vacuum ultraviolet lamp.
As one of the preferable embodiments, the ultraviolet ozone generating device adopts an ultraviolet lamp light source (vacuum ultraviolet lamps with 254nm and 254nm +185 nm) for irradiation, ultraviolet light with high energy is generated under the action of the vacuum ultraviolet lamps for irradiating pollutants, and when the photon energy corresponding to the ultraviolet light with the wavelength is larger than the bond energy of organic matters, chemical bonds can be broken, so that the pollutants are directly cracked into Compounds (CO) with small molecular weight2、H2O), direct photolysis of VOCs; secondly, the ultraviolet light with high energy can decompose oxygen in the air to generate free oxygen free radicals, and the free oxygen free radicals are combined with the oxygen in the air to form O3，O3The oxidizing property of the composite is strong, and the composite can oxidize macromolecular pollutants into micromolecular substances which are key oxidants for oxidizing VOC; in addition, water molecules can generate hydroxyl free radicals (. OH) under the irradiation of high-energy ultraviolet light, and the free oxygen free radicals and the water moleculesSuch reactive groups are also formed after the reaction, and the VOCs can be oxidized by the free radicals with strong oxidizing property.
Further, the organic matter in the air containing VOCs includes any one or a combination of two or more of formaldehyde, benzene, toluene, xylene, ethyl acetate, and the like, but is not limited thereto.
Further, the degradation rate of benzene is 70% or more, preferably 80% or more.
Further, the degradation rate of toluene and/or xylene is 85% or more, preferably 90% or more.
Further, the degradation rate of ethyl acetate is 85% or more, preferably 95% or more.
Further, the small molecule compound comprises CO2And water.
The utility model adopts the ultraviolet ozone generating device, firstly, the high-energy ray beam is utilized to decompose the oxygen molecules in the air to generate free oxygen, namely active oxygen, and the free oxygen is required to be combined with the oxygen molecules because the positive and negative electrons carried by the free oxygen are unbalanced, thereby generating ozone with strong oxidizing property; secondly, the molecular bond of the organic waste gas macromolecule is cracked by using a high-energy ray beam, and the organic waste gas is directly decomposed and treated; thirdly, the high-energy ray beam also has the functions of sterilization and peculiar smell removal.
Further, the ultraviolet lamp tube is inlayed in the ultraviolet ozone generating device, and the ultraviolet lamp tube can produce the ozone that has strong oxidizing property, with the macromolecule organic waste gas that the draught fan introduced, the schizolysis is the micromolecule, directly decomposes the processing to organic waste gas.
As shown in fig. 4, several rows of ultraviolet lamps are arranged in the ultraviolet ozone generator, and a glass light-transmitting structure (also called as a "partition plate") is adopted to form an air flow field, so that when air flows along a flow path formed by the partition plate, the air can be irradiated by all ultraviolet light. An ultraviolet lamp in the ultraviolet ozone generating device adopts a glass light-transmitting structure, so that the illumination time is prolonged, and more free oxygen radicals, ozone and other active particles can be generated. The glass light-transmitting structure utilizes the glass partition plate to prolong the flow field of air flow, so that the air channel is turned back to increase the retention time, and the partition plate adopts transparent quartz glass, so that the irradiation of ultraviolet light is not influenced, the ultraviolet light transmission is not blocked, and the air can receive the irradiation of all ultraviolet rays and the like in the whole flow field, thereby generating more free oxygen radicals and ozone and improving the utilization efficiency of the ultraviolet light.
In addition, the ultraviolet rays can partially kill bacteria, viruses and molds in the air, and the effects of decomposing peculiar smell and volatile organic matters, killing bacteria and decomposing peculiar smell are achieved. The principle is shown in fig. 1.
As one of the preferable embodiments, the catalytic oxidation reaction device mainly utilizes an oxidant (ozone, hydroxyl radical, etc.) to perform catalytic oxidation reaction with the VOCs in an adsorption state on the catalyst, and finally achieves the purpose of degrading the VOC, wherein the catalyst capable of catalytically oxidizing and decomposing the VOCs at normal temperature is used for loading active components on the surface of a catalyst carrier by an impregnation method.
Furthermore, the catalytic oxidation reaction device is characterized in that a normal-temperature catalyst is arranged in a catalytic bed, the normal-temperature catalyst has a unique void structure and surface functional groups, and VOCs and O are converted into oxygen-containing gas3The catalyst is adsorbed on the surface of the catalyst to perform catalytic reaction, and the catalytic oxidation performance is greatly improved. Indoor VOCs-containing air and O3The mixture enters a normal temperature catalytic oxidation device for reaction, and is converted into CO2And H2O。
Furthermore, the catalytic oxidation reaction device consists of a normal-temperature catalyst bed layer, and can be used for catalytically treating single-component or multi-component VOCs at normal temperature. The normal temperature catalyst used by the catalytic oxidation reaction device has the advantages of large specific surface area, large adsorption capacity and the like, and VOCs can be degraded into CO by catalytic oxidation under the action of a proper amount of ozone at room temperature2And H2O; simultaneously, redundant ozone can be annihilated, and the damage caused by the escape of the ozone is avoided.
Further, the catalyst includes a transition metal catalyst including a catalyst support, and a transition metal oxide supported on the catalyst support.
Further, the catalyst support may be activated carbon, alumina, molecular sieve, titania, carbon fiber, ceramic, and the like, preferably alumina, activated carbon, and the like.
Further, the active component of the catalyst mainly comprises transition metal oxides or composite oxides, such as Mn, Cu, Fe, Ni, Ce, Co, Mo, and the like, and the corresponding transition metal oxides comprise manganese oxide, copper oxide, nickel oxide, iron oxide, cerium oxide, cobalt oxide, molybdenum oxide, and the like. The porous structure on the surface and inside of the catalyst greatly increases the capability of adsorbing ozone and VOCs. For example, a composite manganese-based catalyst having more excellent activity in the catalytic oxidation of VOCs, in which CeO is present2Is an active component of the catalyst, which is used as an active center for providing active oxygen and also provides lattice oxygen and surface oxygen. For the formation of MnOx-CeO2Solid solution, molecular oxygen passing through Ce3+-Ce4+、Mn4+-Mn3+The conversion of (a) transfers active oxygen, thereby improving the catalytic performance, and the synergistic effect between Mn and Ce can be represented by the following relation:
2MnO2→Mn2O3+O
Mn2O3+2CeO2→2MnO2+Ce2O3
Ce2O3+12O2→2CeO2
the amount of oxygen content determines Mn2O3In the presence or absence of (C) with CeO2Also plays a role in transferring molecular oxygen to Mn2O3The utilization efficiency of molecular oxygen is improved.
Ozone and VOCs in gas are adsorbed to the surface of the catalyst at the same time, ozone is subjected to a series of free radical chain reactions under the action of the catalyst to decompose and generate a large number of hydroxyl free radicals, and due to the high oxidation potential of the hydroxyl free radicals, VOCs can be deeply decomposed by oxidation at normal temperature, and cyclic compounds can be subjected to ring-opening oxidation decomposition to form carbon dioxide and water.
Due to the strong oxidizing property of the hydroxyl free radicals, VOCs can be completely oxidized at room temperature to generate carbon dioxide and water, so that the operation is safe and the energy consumption is low.
As one of the preferred embodiments, the filtering and sterilizing device is composed of an upper layer of photocatalytic filter screen and a lower layer of photocatalytic filter screen and high-efficiency activated carbon fibers. The surface of the filter screen is coated with a nano photocatalyst layer, and particularly, the nano photocatalyst layer is made of active particles such as active nano silver, nano titanium dioxide and the like, so that various moulds, bacteria and the like can be effectively killed, and toxins released by the bacteria or fungi can be decomposed and harmlessly treated; can filter and remove the particle pollutants in the air.
As one of the preferred embodiments, the VOCs contained in the VOCs-containing air include formaldehyde, benzene, toluene, xylene, ammonia, ethyl acetate, odor, germs, etc., and may synergistically treat PM10, PM2.5, etc., but are not limited thereto.
As one of the preferable embodiments, the air inducing device includes a housing, an air inducing assembly disposed in the housing, an air inlet and an air outlet disposed on the housing, and a ventilation duct communicating the air inducing device, the ozone generating device, the catalytic oxidation reaction device, and the filtering and sterilizing device. The air is intensively introduced into the indoor air from the air inlet through the induced draft fan, sequentially passes through the ultraviolet lamp tube and the catalytic oxidation reactor, is subjected to sterilization through the filter screen to purify the air, and is discharged into the air from the air outlet. The induced draft fan is arranged at the lower part of the whole air purification system, and the air outlet is arranged at the upper part of the air purification system. The induced draft fan is a speed-regulating fan and can regulate air volume.
As one of the preferred embodiments, the method further comprises: and detecting and controlling the concentration of the VOCs at the air inlet, the concentration of the VOCs at the air outlet, the air temperature, the humidity, the power switch, the circulating air quantity, the intensity of the ultraviolet lamp and the like by adopting a detection control device.
Further, the detection control device comprises a switch, an air volume control device and an ultraviolet ozone generation volume. The single chip microcomputer detection system is adopted, so that the concentration and CO of VOCs at the inlet and the outlet can be detected in real time2The concentration, the temperature and the humidity and other parameters control the switch, the circulating air volume and the ultraviolet lamp intensity, and can be displayed on an L CD screen at the same time.
As one of more typical embodiments of the present invention, the air purification method for catalytic oxidative degradation of VOCs may specifically include the following steps:
(1) the air containing VOCs is irradiated by an ultraviolet lamp, free oxygen free radicals or ozone are generated under the action of the ultraviolet lamp, and meanwhile, a part of organic matters are degraded into small molecular compounds.
(2) Air passes through a catalyst bed layer in the catalytic oxidation reaction device, active particles such as ozone and free oxygen radicals are utilized under the action of a catalyst, VOCs molecules are degraded through catalytic oxidation at normal temperature, redundant ozone is simultaneously digested, and secondary pollution is avoided.
(3) The air after oxidative degradation and purification passes through a photocatalysis filter screen containing nano-silver to realize the sterilization and purification effects.
The utility model discloses in, clear up unnecessary ozone, avoid the secondary pollution of ozone also be a characteristic of present case. Ozone is also a contaminant, not weaker than the VOCs component, and without the action of a catalyst, it is difficult to ensure the degradation efficiency. The ozone is not completely degraded in a small amount, and the ozone is discharged along with purified air in a large amount to cause pollution. Under the action of the catalyst, ozone is fully utilized, and redundant ozone can be eliminated.
The embodiment of the utility model provides a another aspect combines the utility model discloses a catalytic oxidation degrades VOCs's air purification method, and the design provides an air purification system for VOCs in the air-purifying improves air quality. The air purification system comprises an induced draft device, an ozone generating device, a catalytic oxidation reaction device, a filtering and sterilizing device and a detection device which are integrally assembled in a shell.
Specifically, air purification system that catalytic oxidation degraded VOCs includes:
the induced draft device comprises a shell, an induced draft assembly arranged in the shell, an air inlet and an air outlet which are arranged on the shell, and a ventilation pipeline which enables the induced draft device, the ozone generating device, the catalytic oxidation reaction device and the filtering and sterilizing device to be communicated, and is at least used for enabling air containing VOCs to enter the ozone generating device;
an ozone generating device at least used for generating free oxygen free radicals and ozone and simultaneously degrading organic matters in the air containing VOCs into micromolecular compounds;
the catalytic oxidation reaction device is at least used for enabling the air treated by the ozone generating device to be in contact with a transition metal catalyst under the condition that free oxygen radicals and ozone exist, so that VOCs molecules are degraded through catalytic oxidation, and primary purified air is obtained;
the filtering and sterilizing device comprises a photocatalytic filtering component and activated carbon fibers, wherein the photocatalytic filtering component is loaded with active nano particles with sterilizing performance and is at least used for filtering and sterilizing the air purified for the first time to obtain air purified for the second time.
In some embodiments, the air purification system further includes a detection control device for detecting at least the inlet VOCs concentration, the outlet VOCs concentration, the air temperature, the humidity, etc., and controlling the power switch, the circulating air volume, the ultraviolet lamp intensity, etc.
Further, the detection control device comprises a single chip microcomputer detection device.
Preferably, the detection control device is further connected with a display device, for example, the display device may be an L CD screen, but is not limited thereto.
Furthermore, the induced air assembly comprises a speed-regulating fan, the induced air assembly is arranged at the lower part of the air purification system, and the air outlet is arranged at the upper part of the air purification system.
As one of the preferable embodiments, the ozone generating device is preferably an ultraviolet ozone generating device, and can be other ozone generating devices, and the ozone generating device is mixed into the air containing the VOCs component, and the latter catalyst can be catalyzed and oxidized and degraded at normal temperature.
Further, the ozone generating device preferably generates ozone and active free radicals by ultraviolet lamp irradiation; other ozone generating devices such as an ozone generator and the like can also be introduced into the system.
In some embodiments, the uv ozone generating device comprises a uv light source, preferably a uv lamp tube, which is used to provide at least free oxygen radicals and ozone with strong oxidizing property, and at the same time, degrade part of the organic compounds in the air containing VOCs into small molecule compounds.
In some embodiments, the uv ozone generator, as shown in fig. 4, several rows of uv lamps are arranged in the uv ozone generator, and the air flow field is formed by using a light-transmitting structure (also called "partition board"), so that when air flows along the flow path formed by the partition board, the air can be irradiated by all uv light. An ultraviolet lamp in the ultraviolet ozone generating device adopts a glass light-transmitting structure, so that the illumination time is prolonged, and more free oxygen radicals, ozone and other active particles can be generated. The glass light-transmitting structure utilizes the glass partition plate to prolong the flow field of air flow, so that the air channel is turned back to increase the retention time, and the partition plate adopts transparent quartz glass, so that the irradiation of ultraviolet light is not influenced, the ultraviolet light transmission is not blocked, and the air can receive the irradiation of all ultraviolet rays and the like in the whole flow field, thereby generating more free oxygen radicals and ozone and improving the utilization efficiency of the ultraviolet light.
As one of the preferable embodiments, the catalytic oxidation reaction device mainly utilizes an oxidant (ozone, hydroxyl radical, etc.) to perform catalytic oxidation reaction with the VOCs in an adsorption state on the catalyst, and finally achieves the purpose of degrading the VOC, wherein the catalyst capable of catalytically oxidizing and decomposing the VOCs at normal temperature is used for loading active components on the surface of a catalyst carrier by an impregnation method.
Furthermore, the catalytic oxidation reaction device is characterized in that a normal-temperature catalyst is arranged in a catalytic bed, the normal-temperature catalyst has a unique void structure and surface functional groups, and VOCs and O are converted into oxygen-containing gas3The catalyst is adsorbed on the surface of the catalyst to perform catalytic reaction, and the catalytic oxidation performance is greatly improved. Indoor VOCs-containing air and O3The mixture enters a normal temperature catalytic oxidation device for reaction, and is converted into CO2And H2O。
Furthermore, the catalytic oxidation reaction device consists of a normal-temperature catalyst bed layer, and can be used for catalytically treating single-component or multi-component VOCs at normal temperature. The normal temperature catalyst used by the catalytic oxidation reaction device has the advantages of large specific surface area, large adsorption capacity and the like, and VOCs can be degraded into CO by catalytic oxidation under the action of a proper amount of ozone at room temperature2And H2O; simultaneously, redundant ozone can be annihilated, and the damage caused by the escape of the ozone is avoided.
Further, the catalyst includes a transition metal catalyst including a catalyst support, and a transition metal oxide supported on the catalyst support.
Further, the active component of the catalyst mainly includes transition metal oxides or composite oxides, such as Mn, Cu, Fe, Ni, Ce, Co, Mo, etc., and the corresponding transition metal oxides include manganese oxide, copper oxide, nickel oxide, iron oxide, cerium oxide, cobalt oxide, molybdenum oxide, etc., but are not limited thereto.
Further, the catalyst support may be activated carbon, alumina, molecular sieve, titania, carbon fiber, ceramic, and the like, preferably alumina, activated carbon, and the like.
As one of the preferred embodiments, the filtering and sterilizing device is composed of an upper layer of photocatalytic filter screen and a lower layer of photocatalytic filter screen and high-efficiency activated carbon fibers. The surface of the filter screen is coated with a nano photocatalyst layer, and particularly, the nano photocatalyst layer is made of active particles such as active nano silver, nano titanium dioxide and the like, so that various moulds, bacteria and the like can be effectively killed, and toxins released by the bacteria or fungi can be decomposed and harmlessly treated; can filter and remove the particle pollutants in the air.
It should be noted that: in this specification, please refer to the above description and introduction of the air purification method for catalytic oxidation degradation of VOCs, and the details thereof are omitted herein for the structures of the air inducing device, the ozone generating device, the catalytic oxidation reaction device, the filtering and sterilizing device, and the detecting device included in the air purification system for catalytic oxidation degradation of VOCs.
The embodiment of the utility model provides an another aspect still provides the application of aforementioned catalytic oxidation degradation VOCs's air purification system in fields such as VOCs purification treatment or air purification treatment.
Furthermore, the catalytic degradation VOCs air purification system can be used for purification treatment of over-standard semi-closed carriage cabins, new off-line locomotive carriages, newly-installed and repaired rooms, closed and semi-closed indoor spaces containing VOCs, or air VOCs in spaces such as unqualified spaces which need living and living of people, and is also suitable for purification treatment of indoor central air conditioners, fresh air systems and the like in hospitals, large-scale venues, families and the like.
The present invention will be described in detail below with reference to embodiments shown in the drawings. However, these embodiments are not intended to limit the present invention, and structural, methodical, or functional changes that may be made by one of ordinary skill in the art based on these embodiments are all included in the scope of the present invention.
Referring to fig. 2, in an exemplary embodiment of the present invention, the air purification system for catalytic oxidation degradation of VOCs includes an air inducing device, an ultraviolet ozone generator 3, a catalytic oxidation reactor 4, a filtering and sterilizing device 5, and a detection control device, wherein the detection control device is connected to a display screen 6, preferably an L CD screen.
Further, the detection control device comprises a switch, an air volume control device and an ultraviolet ozone generation volume. The single chip microcomputer detection system is adopted, so that the concentration and CO of VOCs at the inlet and the outlet can be detected in real time2The concentration, the temperature and the humidity and other parameters control the switch, the circulating air volume and the ultraviolet lamp intensity, and can be displayed on an L CD screen at the same time.
The induced air device includes casing 8, set up in draught fan 2 in the casing 8, set up in air intake 1, air outlet 7 on the casing 8, and make air pipe that induced air device, ultraviolet ozone generator, catalytic oxidation reactor, filter sterilization device communicate. Air is intensively introduced into indoor air from an air inlet 1 by an induced draft fan 2, sequentially passes through an ultraviolet lamp tube and a catalytic oxidation reactor 4, is subjected to air purification after being sterilized by a filter screen, and is discharged into the air from an air outlet. The induced draft fan 2 is arranged at the lower part of the whole air purification system, and the air outlet is arranged at the upper part of the air purification system. The induced draft fan is a speed-regulating fan and can regulate air volume.
As shown in fig. 3 and 4, the ultraviolet ozone generator 3 includes an ultraviolet lamp box 31 having an air inlet 3a and an air outlet 3b, and several rows of ultraviolet lamps 32 (four layers in this example) arranged inside the ultraviolet lamp box, and forms an air flow field by using a partition plate 33 (made of quartz glass), so that when air flows along a flow path formed by the partition plate, the air can be irradiated by all ultraviolet light. An ultraviolet lamp in the ultraviolet ozone generating device adopts a glass light-transmitting structure, so that the illumination time is prolonged, and more free oxygen radicals, ozone and other active particles can be generated. The glass light-transmitting structure utilizes the glass partition plate to prolong the flow field of air flow, so that the air channel is turned back to increase the retention time, and the partition plate adopts transparent quartz glass, so that the irradiation of ultraviolet light is not influenced, the ultraviolet light transmission is not blocked, and the air can receive the irradiation of all ultraviolet rays and the like in the whole flow field, thereby generating more free oxygen radicals and ozone and improving the utilization efficiency of the ultraviolet light.
The catalytic oxidation reactor 4 is composed of a normal temperature catalyst bed layer, and can be used for catalytically treating single-component or multi-component VOCs at normal temperature. The catalyst includes a transition metal catalyst including a catalyst support, and a transition metal oxide supported on the catalyst support. The catalyst support may be activated carbon, alumina, molecular sieve, titania, carbon fiber, ceramic, and the like, but is not limited thereto.
The filtering and sterilizing device 5 consists of an upper layer of photocatalytic filter screen and a lower layer of photocatalytic filter screen and high-efficiency activated carbon fibers. The surface of the filter screen is coated with a nano photocatalyst layer, and particularly, the nano photocatalyst layer is made of active particles such as active nano silver, nano titanium dioxide and the like, so that various moulds, bacteria and the like can be effectively killed, and toxins released by the bacteria or fungi can be decomposed and harmlessly treated; can filter and remove the particle pollutants in the air.
The utility model discloses the air purification system's that adopts work flow does:
the induced draft fan at the lower part of the air purification system pumps air containing VOCs into the purifier → ozone free radical generated by the ultraviolet lamp contacts → enters the catalyst bed for normal temperature catalytic reaction to degrade the VOCs → the filter screen coated with the nano coating is sterilized and purified → clean air is discharged from the air outlet.
Referring to fig. 2, the induced draft fan 2 introduces air into the air purification system, and the air passes through the ultraviolet ray firstAn ozone generator 3 in which radicals such as ozone are generated by irradiation of ultraviolet light, and in which part of simple molecules are broken and decomposed; the VOCs component in the catalytic oxidation reactor 4 reacts with ozone and hydroxyl radical under the action of catalyst to be deeply degraded into CO2And water; then the air is sterilized and deodorized by a filtering and sterilizing device 5 (such as a filter screen) loaded with nano active particles, and finally the purified air returns to the space from an air outlet 7.
The technical solution of the present invention is explained in more detail below with reference to exemplary embodiments.
Example 1
The pilot test experimental device comprises a fan, ultraviolet lamp boxes (14 ultraviolet lamps, 150W/one ultraviolet lamp) and a catalyst box (the catalyst volume is 100L), wherein the fan, the ultraviolet lamp boxes and the catalyst box are sequentially connected through air pipes, the change of the concentration of organic gas can be controlled through temperature change, the frequency converter of the fan can control the air volume, the operation number of the ultraviolet lamps corresponds to different power, different temperatures are realized by adjusting the preset temperature of an electric heater, different relative humidity is realized by adjusting a steam valve, and sampling ports are respectively arranged at an inlet and an outlet of the device to detect the concentration of VOCs.
Basic experimental flow volatilizes the VOCs of required concentration through the water bath heating, carries through the fan and advances pilot scale experimental facilities, and gas is photodissociation through ultraviolet lamp case earlier, passes through catalyst case further catalytic oxidation again, tests corresponding entry and export concentration respectively with the VOCs detector.
Toluene is used as a test, 14 ultraviolet lamps are fully opened, and the air quantity is adjusted to be 450m3H, inlet concentration of toluene 50mg/m3Outlet concentration after treatment 1.6mg/m3The degradation efficiency is 96.6%; monitoring ozone (O)3) Concentration 175mg/m at outlet of concentration lamp box3The outlet concentration of the catalytic reaction device is 0.05mg/m3。
The inlet concentration of toluene was adjusted to 10mg/m3Outlet concentration after treatment 0.9mg/m3The degradation efficiency is 90%; monitoring ozone (O)3) Concentration, outlet concentration 0.05mg/m3。
Example 2
Above-mentioned pilot plant, ultraviolet lamp produce ozone device + normal atmospheric temperature catalytic oxidation degradation VOC air purification system.
The test is carried out by taking ethyl acetate as an example, 14 ultraviolet lamps are fully opened, and the air volume is 450m3Per hour, inlet concentration 38mg/m3Outlet concentration after treatment 2.86mg/m3The degradation efficiency is 92.47%; monitoring ozone (O)3) The outlet concentration of the concentration lamp box is 170mg/m3The outlet concentration of the catalytic reaction device is 0.05mg/m3。
Example 3
Above-mentioned pilot plant, ultraviolet lamp produce ozone device + normal atmospheric temperature catalytic oxidation degradation VOC air purification system.
Test by taking dimethylbenzene as an example, the 14 ultraviolet lamps are fully opened, and the air volume is 450m3H, inlet concentration 26mg/m3Outlet concentration after treatment 1.36mg/m3The degradation efficiency is 94.77%; monitoring ozone (O)3) The outlet concentration of the concentration lamp box is 170mg/m3The outlet concentration of the catalytic reaction device is 0.03mg/m3。
Comparative example 1
In the pilot test experimental device, 8 ultraviolet lamp boxes are opened, other conditions are unchanged, and the air volume is 450m3H, inlet concentration of toluene 46mg/m3Outlet concentration after treatment 2.52mg/m3The degradation efficiency is 94.45%; monitoring ozone (O)3) The outlet concentration of the concentration lamp box is 105mg/m3The outlet concentration of the catalytic reaction device is 0.03mg/m3。
Comparative example 2
In the pilot test experimental device, 14 ultraviolet lamp boxes are opened, the rest conditions are unchanged, and the air volume is 782m3H, inlet concentration of toluene 46mg/m3Outlet concentration after treatment 3.26mg/m392.91% degradation efficiency; monitoring ozone (O)3) Outlet concentration of 136mg/m in concentration lamp box3The outlet concentration of the catalytic reaction device is 0.08mg/m3。
Comparative example 3
In the pilot plant experimental device, 14 ultraviolet lamp boxes are opened, the other conditions are unchanged, and the air volume is 450m3H, inlet concentration of toluene 15mg/m3Outlet after treatmentThe concentration is 1.3mg/m391.33% degradation efficiency; monitoring ozone (O)3) Outlet concentration 126mg/m of concentration lamp box3The outlet concentration of the catalytic reaction device is 0.03mg/m3。
Application example 1
The air purification system for degrading VOCs by catalytic oxidation in the embodiment is applied to actual air purification, and can really realize air purification integrating three effects of filtering, disinfecting and degrading. According to the air purification method for degrading VOCs by catalytic oxidation of the utility model, the air purification device is assembled, wherein the draught fan is positioned at the lower part of the air purification system, and the air outlet is positioned at the upper part of the air purification system and sequentially passes through the ultraviolet ozone generating device, the catalytic oxidation reaction device and the filtering and sterilizing device coated with nano active particles from bottom to top; four universal wheels are assembled at the bottom of the whole purifier, so that the purifier is convenient to move.
The air purification system is arranged in the closed space of the locomotive carriage, and the volume of the air purification system is 200m3Left and right, the draught fan is started to regulate the air quantity to 900m3The ultraviolet lamp is started at the power of 300w, and the concentration of VOCs at the inlet of the purifier is measured to be 6.56mg/m3Concentration of VOCs at outlet of 0.259mg/m3The removal rate is 96.05 percent; after 30 minutes of operation, the inlet concentration was 4.651mg/m30.217mg/m outlet3The removal efficiency is 95.33 percent, the continuous operation is carried out for 3 hours, and the removal efficiency of the purifier is maintained between 90 percent and 96 percent. The concentration of VOCs in the whole closed space is from 7.89mg/m3Reduced to 1.85mg/m3The concentration of VOCs was reduced by 76.55%.
Application example 2
An air purifying device combining ultraviolet photolysis and ozone catalysis, a small purifier device is arranged in a carriage (the space volume is 2.5 m)3) Inside, the fan is started to adjust the wind speed to 50m3The power of the ultraviolet lamp is 150w, and the operation is carried out to obtain 5.133mg/m of the inlet of the purifier3And the concentration of VOCs at the outlet is 0.28mg/m3The removal rate is 94.55 percent; after running for 1 hour, the concentration of VOCs in the carriage is from 6.47mg/m3Reduced to 1.22mg/m3The concentration of VOCs was reduced by 81.14%.
In conclusion, by the technical scheme, the utility model discloses can be under-10 ~ 40 ℃ can high-efficiently clear up VOCs completely, degree of depth, accomplish the degree of depth degradation purification purpose to the air.
It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments can also be combined appropriately to form other embodiments understood by those skilled in the art.
The above list of details is only for the practical implementation of the present invention, and they are not intended to limit the scope of the present invention, and all equivalent implementations or modifications that do not depart from the technical spirit of the present invention should be included in the scope of the present invention.
Claims (9)
1. An air purification system for degrading VOCs by catalytic oxidation is characterized by comprising:
the induced draft device comprises a shell, an induced draft assembly arranged in the shell, an air inlet and an air outlet which are arranged on the shell, and a ventilation pipeline which enables the induced draft device, the ozone generating device, the catalytic oxidation reaction device and the filtering and sterilizing device to be communicated, and is at least used for enabling air containing VOCs to enter the ozone generating device;
an ozone generating device at least used for generating free oxygen free radicals and ozone and simultaneously degrading organic matters in the air containing VOCs into micromolecular compounds;
the catalytic oxidation reaction device is at least used for enabling the air treated by the ozone generating device to be in contact with a transition metal catalyst under the condition that free oxygen radicals and ozone exist, so that VOCs molecules are degraded through catalytic oxidation, and primary purified air is obtained;
the filtering and sterilizing device comprises a photocatalytic filtering component and activated carbon fibers, wherein the photocatalytic filtering component is loaded with active nano particles with sterilizing performance and is at least used for filtering and sterilizing the air purified for the first time to obtain air purified for the second time.
2. The air purification system for catalytic oxidative degradation of VOCs according to claim 1, further comprising a detection control device for detecting and controlling at least the concentration of VOCs at the air inlet, the concentration of VOCs at the air outlet, air temperature, humidity, power switch, circulating air volume and ultraviolet lamp intensity.
3. The air purification system for catalytic oxidative degradation of VOCs according to claim 2, wherein the detection control device comprises a single chip microcomputer detection device, the detection control device is further connected with a display device, and the display device comprises an L CD screen.
4. The air purification system for catalytic oxidative degradation of VOCs of claim 1, wherein: the induced air assembly comprises a speed-regulating fan, the induced air assembly is arranged at the lower part of the air purification system, and the air outlet is arranged at the upper part of the air purification system.
5. The air purification system for catalytic oxidative degradation of VOCs of claim 1, wherein: the ozone generating device comprises an ultraviolet ozone generating device which is at least used for providing free oxygen radicals and ozone with strong oxidizing property and simultaneously degrading partial organic matters in the air containing VOCs into small molecular compounds.
6. The air purification system for catalytic oxidative degradation of VOCs of claim 5, wherein: ultraviolet lamp tubes which are uniformly distributed are arranged in the ultraviolet ozone generating device, and a light transmitting structure is further arranged in the ultraviolet ozone generating device.
7. The air purification system for catalytic oxidative degradation of VOCs of claim 6, wherein: the light-transmitting structure is a partition plate.
8. The air purification system for catalytic oxidative degradation of VOCs of claim 1, wherein: the filtering and sterilizing device comprises a photocatalytic filtering component and an activated carbon fiber which are arranged in a stacked mode, wherein a nano photocatalyst layer is coated on the surface of the photocatalytic filtering component, the nano photocatalyst layer comprises active nano particles with sterilizing performance, and the active nano particles are nano silver and/or nano titanium dioxide.
9. The air purification system for catalytic oxidative degradation of VOCs of claim 8, wherein: the photocatalytic filter component is a photocatalytic filter screen.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113750788A (en) * | 2021-09-23 | 2021-12-07 | 山东中创新材料科技有限公司 | Aluminum veneer paint spraying VOCs organic waste gas collecting and treating device |
| CN114522629A (en) * | 2022-03-31 | 2022-05-24 | 安徽迪顺科技有限公司 | Ultraviolet photolysis ozone generating device with built-in catalytic grating |
| CN114653194A (en) * | 2021-07-21 | 2022-06-24 | 浙江锌芯友好环境材料科技有限公司 | Technology and device for decomposing organic waste gas by microwave and ozone |
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2019
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114653194A (en) * | 2021-07-21 | 2022-06-24 | 浙江锌芯友好环境材料科技有限公司 | Technology and device for decomposing organic waste gas by microwave and ozone |
| CN113750788A (en) * | 2021-09-23 | 2021-12-07 | 山东中创新材料科技有限公司 | Aluminum veneer paint spraying VOCs organic waste gas collecting and treating device |
| CN113750788B (en) * | 2021-09-23 | 2024-01-16 | 山东中创新材料科技有限公司 | VOCs organic waste gas collection and treatment device for aluminum veneer paint spraying |
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