CN220214502U - Laboratory gas purification device based on photocatalysis technology - Google Patents
Laboratory gas purification device based on photocatalysis technology Download PDFInfo
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- CN220214502U CN220214502U CN202321191885.9U CN202321191885U CN220214502U CN 220214502 U CN220214502 U CN 220214502U CN 202321191885 U CN202321191885 U CN 202321191885U CN 220214502 U CN220214502 U CN 220214502U
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- 238000000746 purification Methods 0.000 title claims abstract description 24
- 230000001699 photocatalysis Effects 0.000 title claims abstract description 20
- 238000005516 engineering process Methods 0.000 title claims abstract description 16
- 238000007146 photocatalysis Methods 0.000 title claims abstract description 15
- 230000007246 mechanism Effects 0.000 claims abstract description 43
- 239000012855 volatile organic compound Substances 0.000 claims abstract description 35
- 238000006243 chemical reaction Methods 0.000 claims abstract description 30
- 239000011941 photocatalyst Substances 0.000 claims abstract description 21
- 238000012544 monitoring process Methods 0.000 claims abstract description 10
- 238000001179 sorption measurement Methods 0.000 claims description 60
- 239000003054 catalyst Substances 0.000 claims description 27
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 7
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical group O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 5
- 239000000919 ceramic Substances 0.000 claims description 5
- 239000002808 molecular sieve Substances 0.000 claims description 5
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims description 5
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 5
- 230000000593 degrading effect Effects 0.000 claims description 3
- 230000003993 interaction Effects 0.000 claims description 2
- 238000007599 discharging Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 47
- 239000000463 material Substances 0.000 description 8
- 239000003344 environmental pollutant Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 231100000719 pollutant Toxicity 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 239000000126 substance Substances 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000007254 oxidation reaction Methods 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 239000012495 reaction gas Substances 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 150000002894 organic compounds Chemical class 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 239000000443 aerosol Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000007084 catalytic combustion reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 238000006303 photolysis reaction Methods 0.000 description 1
- 230000015843 photosynthesis, light reaction Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Landscapes
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The utility model discloses a laboratory gas purification device based on a photocatalysis technology, which comprises a gas inlet mechanism, a reaction mechanism, an emission mechanism and an automatic monitoring control system, wherein the gas inlet mechanism is used for sending gas containing VOCs into the reaction mechanism, the reaction mechanism is used for purifying the sent gas, the emission mechanism is used for discharging the purified gas, and the automatic monitoring control system is used for detecting the performance of a photocatalyst core and the VOCs gas and controlling each mechanism.
Description
Technical Field
The utility model relates to a laboratory gas purifying device based on photocatalysis technology.
Background
In recent years, with the aggravation of haze conditions, the atmospheric pollution gradually enters public views, the atmospheric pollution sources are complex, the atmospheric pollution sources are not only limited to industrial pollution, but also contribute to part of pollution in university teaching and scientific research laboratories, and the main pollutants in the exhaust gas discharged from the laboratories are Volatile Organic Compounds (VOCs).
Volatile Organic Compounds (VOCs) are a collective term for volatile organic compounds having a melting point below room temperature and a boiling point between 50 and 260 ℃. It is the main pollutant in local environment, and may form secondary aerosol to trigger haze, etc. The main pollutant in the exhaust gas discharged by the laboratory is VOCs, and the active carbon adsorption technology is mainly adopted in the laboratory at present, but the active carbon is easy to adsorb and saturated, and the dangerous waste treatment after saturation is also a problem.
The utility model comprises the following steps:
the utility model aims to solve the defects in the prior art and provides a laboratory gas purifying device based on a photocatalysis technology.
The laboratory gas purification device based on the photocatalysis technology comprises an air inlet mechanism, a reaction mechanism, an exhaust mechanism and an automatic monitoring control system, wherein the air inlet mechanism is used for feeding gas containing VOCs into the reaction mechanism, the reaction mechanism is used for purifying the fed gas, the exhaust mechanism is used for exhausting the purified gas, and the automatic monitoring control system is used for detecting the performance of a photocatalyst core and the VOCs gas and controlling each mechanism;
the reaction mechanism comprises a box body, at least three groups of purification structures are arranged in the box body, each group of purification structure comprises at least one adsorption catalyst layer and at least one ultraviolet tube layer, the adsorption catalyst layer is a honeycomb structure formed by a plurality of adsorption catalyst particles, each adsorption catalyst particle comprises an adsorption shell and a photocatalyst core, the adsorption shell is wrapped outside the photocatalyst core, the adsorption shell is used for adsorbing VOCs in gas, the outside of the photocatalyst core is used for degrading the VOCs, the ultraviolet tube layer comprises a plurality of ultraviolet tube layers, and the ultraviolet tube layers are used for providing reaction conditions for the photocatalyst core.
Working principle: the energy of the short-wavelength ultraviolet photon is higher than the bond energy of chemical bonds in most pollutant molecules, so that the ultraviolet photon can be directly broken through the action of the molecular chemical bonds, thereby achieving the purpose of decomposition. In addition, based on the same principle, 185nm ultraviolet rays can also convert oxygen and water vapor in the air into atomic oxygen and active hydroxyl (HO.) which can also react with pollutant molecules to decompose and reduce the concentration of exhaust gas pollutants, and the basic reaction principle can be described by the following reaction formula:
VOCs+hv→CO2+H2O；
the photocatalysis technology is used as one of the composite advanced oxidation technology, and refers to that under the irradiation of light, the photocatalyst can be oxidized and decomposed into various organic compounds by converting light energy into chemical energy, so that the catalyst has strong oxidizing capability.
Photocatalytic oxidation reaction mechanism:
O 2 + e-→O 2 (active oxygen)
O 2 - +2H 2 O+e - →H 2 O 2 +2OH
H 2 O 2 + e - →·OH+OH
h + +H 2 O→H + +·OH
h + +OH-→·OH；
Based on the characteristics, through coupling a photolysis process and a photocatalysis process, active oxygen generated by light excitation and VOCs adsorbed by an adsorption catalyst are utilized to perform an efficient oxidation process in an adsorbent limited space, so that organic pollutants are finally generated into V. This is consistent with the catalytic combustion process in terms of chemical mechanism, but its reaction temperature is below 100 ℃;
the utility model wraps the material with adsorption function outside the photocatalysis material as the shell, when the gas enters the box body and passes through the adsorption catalyst layer, the adsorption shell adsorbs VOCs and active oxygen substances in the gas, and under the irradiation of the ultraviolet lamp tube, the photocatalysis core plays a catalytic role to decompose the VOCs and generate CO 2 And H 2 O, and VOCs on the adsorption shell is degraded, the adsorption shell can adsorb VOCs in the gas again, so that materials in the adsorption catalytic particles are reused, and frequent replacement is avoided.
In order to ensure adsorptivity, the adsorption shell is a ceramic molecular sieve, the ceramic molecular sieve is high in safety and good in regenerability, the photocatalyst core is titanium oxide, and the titanium oxide can be deeply purified at normal temperature, and is environment-friendly.
The reaction system consists of UV lamp tubes and adsorption catalyst modules, and the arrangement and the quantity of the lamp tubes and the arrangement of the adsorption catalyst play a decisive role in the purification effect of the equipment, which is also the reaction principle of the reaction system. Therefore, the layout and the number of the UV lamp tubes and the adsorption photo-thermal catalysts are required to be correspondingly adjusted according to the actual conditions including the types, the concentrations and the air volumes of the treatment gases in the design and manufacture process, so that the equipment can be ensured to exert the due effect to meet the detection requirement.
Before the gas passes through the adsorption catalyst, the advanced pretreatment can lead the subsequent purifying effect to be better, the inlet of the box body is provided with a filter layer, ozone can be possibly generated in the oxidation reaction, and therefore, the outlet of the box body is provided with an ozone purifying layer.
The automatic monitoring control system comprises a ballast, an alternating current contactor, a control switch, a PLC controller, a PIC single-chip microcomputer controller and a man-machine interaction interface, wherein the PIC single-chip microcomputer controller is used for controlling the content of VOCs in gas, the humidity and the pressure of the gas and the wind speed of a fan, the PLC controller is used for controlling ultraviolet lamp tubes in a purifying structure, the actual condition and the use cost are considered in the design and manufacturing process, the equipment is designed into a plurality of groups of control, the purifying efficiency is ensured, and a plurality of groups or a single group of operation are selected according to the gas type concentration and the flow speed which are required to be processed, so that the equipment is more energy-saving and environment-friendly in the use process.
The beneficial effects are that: according to the utility model, the adsorption material is wrapped on the outer side of the photocatalytic material to form the adsorption catalyst layer, when the gas passes through under ultraviolet irradiation, the adsorption shell can adsorb active oxidation substances and VOCs in the gas, so that the concentration of the VOCs in the waste gas is quickly reduced, the passing gas reaches the emission standard, the adsorbed VOCs are degraded into water and carbon dioxide through the photocatalyst core in the adsorption shell, the adsorption shell is liberated, the adsorption shell can be used repeatedly, the cost is reduced, the purified gas is ensured to reach the emission standard, and the following removal effects on different VOCs are realized:
drawings
FIG. 1 is a cross-sectional view of a laboratory gas cleaning device based on photocatalytic technology;
FIG. 2 is a perspective view of a laboratory gas purification apparatus based on photocatalytic technology;
in the figure, 1, a box body, 2, a filter layer, 3, an adsorption catalyst layer, 4, an ultraviolet lamp tube layer, 5 and an ozone purifying layer.
Detailed Description
The present utility model will be further described in detail with reference to the following examples and drawings for the purpose of enhancing the understanding of the present utility model, which examples are provided for the purpose of illustrating the present utility model only and are not to be construed as limiting the scope of the present utility model.
As shown in fig. 1, a case 1, a filter layer 2, an adsorption catalyst layer 3, an ultraviolet lamp tube layer 4, and an ozone purifying layer 5.
The laboratory gas purification device based on the photocatalysis technology comprises an air inlet mechanism, a reaction mechanism, an exhaust mechanism and an automatic monitoring control system, wherein the air inlet mechanism is used for feeding gas containing VOCs into the reaction mechanism, the reaction mechanism is used for purifying the fed gas, the exhaust mechanism is used for exhausting the purified gas, and the automatic monitoring control system is used for detecting the performance of a photocatalyst core and the VOCs gas and controlling each mechanism; specifically, the air inlet mechanism is connected with the air inlet of the reaction mechanism, and the discharge mechanism is connected with the air outlet of the reaction mechanism; the exhaust gas containing VOCs is collected by the air inlet and is conveyed into the reaction mechanism for purification, and after the purification is finished, the exhaust gas enters the discharge mechanism, a fan is arranged in the discharge mechanism, and the fan blows the gas out of the chimney along the pipeline;
the reaction mechanism comprises a box body 1, at least three groups of purification structures are arranged in the box body 1, each group of purification structure comprises at least one adsorption catalyst layer 3 and at least one ultraviolet lamp tube layer 4, the adsorption catalyst layer 3 is a honeycomb structure formed by a plurality of adsorption catalyst particles, the adsorption catalyst particles comprise an adsorption shell and a photocatalyst core, the adsorption shell is wrapped on the outer side of the photocatalyst core and is used for adsorbing VOCs in gas, the outer side of the photocatalyst core is used for degrading the VOCs, the ultraviolet lamp tube layer 4 is formed by a plurality of ultraviolet lamp tubes, and the ultraviolet lamp tube layer 4 is used for providing reaction conditions for the photocatalyst core; specifically, the gas passes through a four-layer purification structure, VOCs are adsorbed on the adsorption shell, after the purification of the gas is completed, the gas meets the emission standard, and then the photocatalyst core in the adsorption shell degrades the adsorbed VOCs, liberates the adsorption shell, and realizes the recycling of the adsorption material;
when the box body 1 is designed, various factors such as pressure, gas concentration and type are comprehensively determined mainly according to the gas flow to be treated. In order to ensure the purification efficiency and improve the service life of the equipment, the stainless steel plate 201 is generally adopted for manufacturing
In this embodiment, the adsorption shell is a ceramic molecular sieve, the photocatalyst core is titanium oxide, specifically, the ceramic molecular sieve has good adsorptivity and good reusability, but the cost is high, the adsorption capacity is low and easy to saturate, if the adsorption capacity is not degraded, the adsorption shell needs to be replaced frequently, the titanium oxide can be deeply purified at normal temperature, the adsorption shell is green and environment-friendly, the gas with short residence time cannot be effectively degraded, and the adsorption shell are combined to produce a material which is stable in adsorption and can be reused.
In this embodiment, the reaction system is composed of UV lamps and adsorption catalyst modules, and the arrangement, number and arrangement of the adsorption catalyst of the lamps play a decisive role in purifying the device, which is also the reaction principle of the reaction system. Therefore, in the process of designing and manufacturing, the layout and the number of the UV lamp tubes and the adsorption photo-thermal catalysts need to be correspondingly adjusted according to the actual conditions including the types, the concentrations and the air volumes of the treatment gases, so that the device can be ensured to exert the due effect to meet the detection requirement, specifically, in this example, each group of purification structure is provided with one adsorption catalyst layer 3 and two ultraviolet lamp tube layers 4, and the adsorption catalyst layer 3 is positioned between the two ultraviolet lamp tube layers 4.
In this embodiment, the inlet of the case 1 is provided with the filter layer 2, the outlet of the case 1 is provided with the ozone purifying layer 5, specifically, the filter layer 2 at the inlet serves as pretreatment to screen out the particulate matters in advance, improve the adsorption efficiency of the adsorption shell, improve the purifying rate of seed production, and the photocatalytic material is easy to decompose and oxidize the organic compounds under the irradiation of ultraviolet rays, so that ozone is easy to be generated.
In this embodiment, the automatic monitoring control system includes a ballast, an ac contactor, a control switch, a PLC controller, a PIC single-chip microcomputer controller, and a man-machine interface, where the PIC single-chip microcomputer controller controls the content of VOCs in the gas, the humidity and pressure of the gas, and the wind speed of the fan, and the PLC controller controls the ultraviolet lamp tube in the purification structure, specifically, the system dilutes the pollutant standard gas by precisely controlling the flow of multiple paths of gas, and controls the humidity of the reaction gas in a dry-wet gas mixing manner, so as to finally obtain the reaction gas with controllable concentration and humidity; the temperature, humidity, pressure and other parameters of the air inlet (standard) and the air outlet (optional) are monitored by adopting a temperature, humidity and pressure sensor, the state of the reaction gas is monitored in real time, and the humidity of the reaction gas can be further subjected to feedback control; meanwhile, the system has a plurality of control modes, and can meet the test requirements of different tests.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.
Claims (4)
1. The laboratory gas purification device based on the photocatalysis technology is characterized by comprising an air inlet mechanism, a reaction mechanism, an exhaust mechanism and an automatic monitoring control system, wherein the air inlet mechanism is used for conveying gas containing VOCs into the reaction mechanism, the reaction mechanism is used for purifying the conveyed gas, and the exhaust mechanism is used for exhausting the purified gas;
the reaction mechanism comprises a box body, at least three groups of purification structures are arranged in the box body, each group of purification structure comprises at least one adsorption catalyst layer and at least one ultraviolet tube layer, each adsorption catalyst layer is a honeycomb structure formed by a plurality of adsorption catalyst particles, each adsorption catalyst particle comprises an adsorption shell and a photocatalyst core, the adsorption shells are wrapped outside the photocatalyst cores, the adsorption shells are used for adsorbing VOCs in gas, the outside of the photocatalyst cores are used for degrading the VOCs, each ultraviolet tube layer comprises a plurality of ultraviolet tube layers, and each ultraviolet tube layer is used for providing reaction conditions for the photocatalyst cores.
2. The laboratory gas purification device based on the photocatalysis technology according to claim 1, wherein the adsorption shell is a ceramic molecular sieve, and the photocatalyst core is titanium oxide.
3. The laboratory gas purifying device based on the photocatalysis technology according to claim 1, wherein the inlet of the box body is provided with a filter layer, and the outlet of the box body is provided with an ozone purifying layer.
4. The laboratory gas purification device based on the photocatalysis technology according to claim 1, wherein the automatic monitoring control system comprises a ballast, an alternating current contactor, a control switch, a PLC controller, a PIC single-chip microcomputer controller and a man-machine interaction interface, wherein the PIC single-chip microcomputer controller is used for controlling the content of VOCs in gas, the humidity and the pressure of the gas and the wind speed of a fan, and the PLC controller is used for controlling ultraviolet lamp tubes in the purification structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321191885.9U CN220214502U (en) | 2023-05-17 | 2023-05-17 | Laboratory gas purification device based on photocatalysis technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321191885.9U CN220214502U (en) | 2023-05-17 | 2023-05-17 | Laboratory gas purification device based on photocatalysis technology |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220214502U true CN220214502U (en) | 2023-12-22 |
Family
ID=89184712
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321191885.9U Active CN220214502U (en) | 2023-05-17 | 2023-05-17 | Laboratory gas purification device based on photocatalysis technology |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220214502U (en) |
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2023
- 2023-05-17 CN CN202321191885.9U patent/CN220214502U/en active Active
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