CN109046019B - Low-energy-consumption organic volatile gas treatment device and method - Google Patents
Low-energy-consumption organic volatile gas treatment device and method Download PDFInfo
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Classifications
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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
- B01D53/8678—Removing components of undefined structure
- B01D53/8687—Organic components
-
- 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
- B01D53/02—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 by adsorption, e.g. preparative gas chromatography
-
- 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
- B01D53/32—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 by electrical effects other than those provided for in group B01D61/00
- B01D53/323—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 by electrical effects other than those provided for in group B01D61/00 by electrostatic effects or by high-voltage electric fields
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D2257/708—Volatile organic compounds V.O.C.'s
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/40—Further details for adsorption processes and devices
- B01D2259/40083—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption
- B01D2259/40088—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by heating
- B01D2259/40098—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by heating with other heating means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/80—Employing electric, magnetic, electromagnetic or wave energy, or particle radiation
- B01D2259/804—UV light
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/80—Employing electric, magnetic, electromagnetic or wave energy, or particle radiation
- B01D2259/818—Employing electrical discharges or the generation of a plasma
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- 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
Abstract
The invention relates to the technical field of gas purification treatment, in particular to a low-energy-consumption organic volatile gas treatment device and method. After adsorption saturation, the desorbed VOCs are further subjected to catalytic oxidation and decomposition in a photoelectrocatalytic oxidation mode, so that the adsorption material is regenerated, and the energy consumption during the whole operation can be effectively reduced. Because the concentration of the desorbed VOCs is higher, the reaction efficiency of the photoelectrocatalytic oxidation is high and the time is shorter, the cost of the whole gas purification is greatly reduced, and the method is suitable for the purification treatment of the low-concentration VOCs gas and has the characteristics of high purification efficiency, low energy consumption, wide application range and strong adaptability.
Description
Technical Field
The invention relates to the technical field of gas purification treatment, in particular to a low-energy-consumption organic volatile gas treatment device and method.
Background
Volatile Organic Compounds (VOCs) pollution has become one of the major contributors to atmospheric pollution, and VOCs are produced in industries such as printing, coating, paint spraying, fuel oil, chemical industry, medicine, cultivation, catering and the like. According to different concentration levels of VOCs, different treatment methods are adopted, and the main treatment methods at present are combustion, adsorption, absorption, condensation, plasma, photocatalysis and the like.
The regenerative oxidation RTO, namely Regenerative Thermal Oxidizer, directly combusts and oxidizes VOCs in the waste gas into carbon dioxide and water at a high temperature of more than 700 ℃, is generally suitable for treating the waste gas with higher concentration and higher concentration, wherein the concentration of the VOCs is more than 5000mg/m, and has the advantages of complex equipment process and high treatment energy consumption.
The regenerative catalytic oxidation RCO, namely Regenerative Catalytic Oxidizers, is to catalytically oxidize the VOCs in the waste gas into corresponding carbon dioxide and water at a lower temperature of 300-450 ℃, and is suitable for purifying the waste gas with medium concentration and the VOCs concentration of 2000-5000 mg/m. Because the RCO catalyst mainly adopts noble metals such as platinum, palladium, molybdenum and the like, the material and equipment cost and the operation cost are high.
The adsorption method is effective, such as an active carbon adsorption method, mainly utilizes micropores with large specific surface of carbon material to adsorb organic molecules, and is characterized by simple adsorption equipment and no energy consumption, but the active carbon needs to be replaced after being saturated in adsorption, and the use cost is high.
The newly developed technologies for removing VOC by photoelectrocatalysis mainly comprise technologies such as equal photocatalytic oxidation, plasma oxidation and the like, are suitable for purifying gas with moderate concentration of 500-2000PPM, and have good cost performance; and for the VOCs gas with lower concentration less than or equal to 500PPM, the energy consumption of the relative treatment is larger, the efficiency is lower, and the treatment effect is poorer.
Because most VOCs concentration generated in the actual industry and life belongs to a low concentration range, how to develop a technology suitable for purifying organic volatile gas with lower concentration and lower treatment cost is needed to effectively solve the atmospheric pollution at present.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a low-energy-consumption organic volatile gas treatment device and a low-energy-consumption organic volatile gas treatment method, which are suitable for purifying organic volatile gases with low concentration and low treatment cost.
In order to achieve the above purpose, the invention provides a low-energy consumption organic volatile gas treatment device, which comprises a microporous gas adsorption regeneration module, a gas catalytic oxidation reaction module, a sensing detection module, a power supply and electric appliance control module, and is characterized in that: a group of microporous gas adsorption regeneration modules and a group of gas catalytic oxidation reaction modules are arranged between the gas inlet chamber and the gas outlet chamber, the sensing detection modules are respectively arranged in the gas inlet chamber and the gas outlet chamber, the input and output ends of the sensing detection modules are connected with the signal transmission control ends of the power supply and the electric appliance control module, and the power output ends of the power supply and the electric appliance control module are respectively connected with the input ends of the microporous gas adsorption regeneration modules and the input ends of the gas catalytic oxidation reaction modules.
The microporous gas adsorption regeneration module comprises an adsorption material bracket, a desorption regeneration heater and microporous adsorption materials, wherein the desorption regeneration heater is arranged on the upper surface and the lower surface of the adsorption material bracket, the microporous adsorption materials are arranged on the surface of the desorption regeneration heater, the desorption regeneration heater is connected with a power supply and an electric appliance control module, the desorption regeneration heater adopts resistance type or high-frequency induction type heating, and the highest temperature is less than or equal to 200 ℃.
The microporous adsorption material is prepared from a material with a specific surface of more than or equal to 500m 2 The microporous adsorption material has the function of adsorbing VOCs and is any one or more than one of microporous carbon particles, fibers, carbon nanotubes, carbon nanofibers, carbon aerogel, graphene, alumina, silica, magnesia or zeolite nanofibers, aerogel, molecular sieves and particles; the microporous adsorption material has a film structure with the thickness of 10-50mm, or a spherical or bar-shaped granular structure with the size of 1-10mm, or a honeycomb tubular cube or cylinder structure with the aperture of 1-10 mm.
The microporous adsorption material and the adsorption material support are of a parallel plate type array structure, and a gas channel is arranged between the microporous adsorption material and the adsorption material support, and the distance between the gas channels is 2-20mm.
The catalytic material of the gas catalytic oxidation reaction module is WO 3 、CuO、SnO 2 、TiO 2 、ZnO、MgO、CaO、Fe 2 O 3 、MnO 2 、Mn 3 O 4 、V 2 O 5 At least one metal oxide in NiO, the catalytic material is composed of nano-structure crystals with the particle size of 10-100nm, and the shape is flake, sphere, column or fiber.
The metal oxide is doped with at least one element of Pt, pd, au, ag, cu, fe, N, F, C.
The gas catalytic oxidation reaction module comprises a pair of gas catalytic oxidation reaction modulesThe plasma catalytic reaction chamber is composed of the cathode and the anode, the cathode and the anode substrate are arranged in parallel, a quartz or alumina ceramic dielectric layer with the thickness of 0.1-3mm is arranged between the cathode and the anode, a high-frequency alternating current power supply with the frequency of 10-100KHz and the voltage of 0.5-20KV is connected between the cathode and the anode, and the current density between the electrodes is 0.01-10mA/cm 2 。
The gas catalytic oxidation reaction module is characterized in that a photoelectrocatalytic oxidation reaction chamber is formed by one or more ultraviolet light sources and catalytic materials, wherein the ultraviolet light sources adopt electrodeless quartz lamps, the wavelength is 250-400nm, the power of unit light sources is 0.1-2kW, and high-frequency or microwave induction luminescence is adopted.
The sensing detection module consists of a photo-ion detector PID and a temperature sensor TC, wherein the total concentration TVOC range detected by the photo-ion detector PID is 1-5000PPM, the temperature range detected by the temperature sensor TC is 0-500 ℃, and the power range of the power supply and electric appliance control module is 10-10000W.
A low-energy consumption organic volatile gas treatment method comprises the following steps of 1, adsorbing VOCs gas with the concentration of 1-500PPM by a microporous adsorption material, 2, heating the microporous adsorption material by a desorption regeneration heater after the concentration of the gas adsorbed by the microporous adsorption material reaches saturation, so that the VOCs adsorbed by the microporous adsorption material are desorbed, regenerating the microporous adsorption material and continuously adsorbing the VOCs gas, and 3, starting a gas catalytic oxidation reaction module, performing catalytic oxidation reaction on organic pollutants, decomposing the VOCs into carbon dioxide and water and discharging.
Compared with the prior art, the invention combines the microporous adsorption material with the photoelectrocatalysis technology, and absorbs the VOCs in an adsorption mode without energy consumption in most of the time. After adsorption saturation, the desorbed VOCs are further subjected to catalytic oxidation and decomposition in a photoelectrocatalytic oxidation mode, so that the adsorption material is regenerated, and the energy consumption during the whole operation can be effectively reduced. Because the concentration of the desorbed VOCs is higher, the reaction efficiency of the photoelectrocatalytic oxidation is high and the time is shorter, the cost of the whole gas purification is greatly reduced, and the method is suitable for the purification treatment of the low-concentration VOCs gas and has the characteristics of high purification efficiency, low energy consumption, wide application range and strong adaptability.
Drawings
Fig. 1 is a structural diagram of the present invention.
Fig. 2 is a structural view of the microporous gas adsorption regeneration module of the present invention.
FIG. 3 is a top view of the microporous gas adsorption regeneration module of the present invention.
Detailed Description
The invention will now be further described with reference to the accompanying drawings.
Referring to fig. 1, the invention relates to a low-energy-consumption organic volatile gas treatment device, which comprises a microporous gas adsorption regeneration module, a gas catalytic oxidation reaction module, a sensing detection module, a power supply and electric appliance control module, wherein an air inlet 1 is arranged on an air inlet chamber 2, and an air outlet 6 is arranged on an air outlet chamber 5. A group of microporous gas adsorption regeneration modules 3 and a group of gas catalytic oxidation reaction modules 4 are arranged between the air inlet chamber 2 and the air outlet chamber 5, the sensing detection modules are respectively arranged in the air inlet chamber 2 and the air outlet chamber 5, the input and output ends of the sensing detection modules are connected with the signal transmission control ends of the power supply and electric appliance control module 7, and the power output ends of the power supply and electric appliance control module 7 are respectively connected with the input ends of the microporous gas adsorption regeneration modules 3 and the input ends of the gas catalytic oxidation reaction modules 4.
Referring to fig. 2 and 3, the microporous gas adsorption regeneration module 3 comprises an adsorption material bracket 10, a desorption regeneration heater 11 and a microporous adsorption material 12, wherein the desorption regeneration heater 11 is installed on the upper surface and the lower surface of the adsorption material bracket 10, the microporous adsorption material 12 is installed on the surface of the desorption regeneration heater 11, the desorption regeneration heater 11 is connected with a power supply and electrical appliance control module 7, the desorption regeneration heater 11 adopts resistance type or high-frequency induction type heating, and the highest temperature is less than or equal to 200 ℃. The adsorption material bracket 10 is made of at least one material selected from stainless steel, ceramic or graphite, the desorption regeneration heater 11 comprises heating materials such as resistance wires, graphite fibers and the like, and the temperature range is controllable at 30-250 ℃.
The microporous adsorption material 12 has a specific surface area of 500m or more 2 Carbon or oxide microporous material composition/g, microThe adsorption material 12 has the function of adsorbing VOCs and is any one or more than one of microporous carbon particles, fibers, carbon nanotubes, carbon nanofibers, carbon aerogel, graphene, alumina, silica, magnesia or zeolite nanofibers, aerogel, molecular sieves and particles; the microporous adsorbent 12 is of a thin film structure having a thickness of 10-50mm, or a spherical or rod-shaped granular structure having a size of 1-10mm, or a honeycomb tubular cube or cylinder structure having a pore diameter of 1-10 mm. The size of the micropores is 0.1-1nm, the adsorption temperature is 10-50 ℃, when VOCs are adsorbed to saturation, the VOCs can be heated and desorbed, the desorption temperature is 100-200 ℃, and the desorption time is 0.5-5 hours, so that the VOCs can be desorbed completely.
The microporous adsorption material 12 and the adsorption material support 10 are of a parallel plate type array structure, and a gas channel is arranged between the microporous adsorption material 12 and the adsorption material support 10, and the distance between the gas channels is 2-20mm.
The catalytic material of the gas catalytic oxidation reaction module 4 is WO 3 、CuO、SnO 2 、TiO 2 、ZnO、MgO、CaO、Fe 2 O 3 、MnO 2 、Mn 3 O 4 、V 2 O 5 At least one metal oxide of NiO, which may be doped with at least one element of Pt, pd, au, ag, cu, fe, N, F, C. The catalytic material is composed of nano-structure crystals with the particle size of 10-100nm, and the shape of the catalytic material is flake, sphere, column or fiber. The catalytic material is coated on the surface of the ceramic, glass or metal matrix by adopting the processes of spraying, roller coating, printing, dip coating, chemical vapor deposition CVD, physical vapor deposition PVD and the like to form a film, and the thickness of the film is 0.1-10 mu m.
The gas catalytic oxidation reaction module 4 can be performed by combining high-frequency capacitive dielectric barrier discharge type plasmas with catalytic materials, or by combining ultraviolet light sources with photocatalytic materials. After the gas after plasma catalytic ionization is fully contacted with the surface of the catalytic material, the catalytic efficiency of gas reaction can be improved.
A plasma catalytic reaction chamber in the gas catalytic oxidation reaction module 4, which consists of a pair of more cathodes and anodes, the cathodes and the anodesThe anode base plates are arranged in parallel, a quartz or alumina ceramic dielectric layer with the thickness of 0.1-3mm is arranged between the cathode and the anode, a high-frequency alternating current power supply with the frequency of 10-100KHz and the voltage of 0.5-20KV is connected between the cathode and the anode, and the current density between the electrodes is 0.01-10mA/cm 2 。
The power source applied by the capacitive catalytic reaction electrode can be pulse direct current or alternating current, and is mainly high-voltage pulse power source with the voltage of 0.5-10kV and 10-50kHz, and the power density is 0.1-100W/m 2 . The capacitive electrode can be made into a tubular or flat plasma generator, namely, a metal film or a netlike electrode is arranged on the inner surface and the outer surface of a quartz tube or the upper surface and the lower surface of a quartz plate to serve as an anode and a cathode, and plasma is generated for reaction after being connected with a high-frequency alternating power supply.
The gas catalytic oxidation reaction module 4 is a photoelectrocatalytic oxidation reaction chamber which is composed of one or more ultraviolet light sources and catalytic materials, wherein the ultraviolet light sources adopt electrodeless quartz lamps, the wavelength is 250-400nm, the power of unit light sources is 0.1-2kW, and high-frequency or microwave induction luminescence is adopted. Preferably, the electrodeless quartz lamp is a quartz tube type electrodeless induction ultraviolet lamp, the power of a unit light source is not lower than 10W, and the electrodeless quartz lamp has the characteristics of high efficiency and long service life.
The sensing detection module consists of a photo-ion detector PID and a temperature sensor TC, wherein the total concentration TVOC range detected by the photo-ion detector PID is 1-5000PPM, and the temperature range detected by the temperature sensor TC is 0-500 ℃; the concentration of the total organic matters TVOC and the temperature of the desorption regeneration heater 11 can be monitored in real time, and the indexes such as the flow rate, the air pressure and the like of the air can be detected. The treated total organic matter has TVOC concentration of 1-500PPM and unit module treatment flow of 10-10000m 3 /h。
The power supply and electric appliance control module 7 has a power range of 10-10000W. The power supply supplies power to the microporous gas adsorption regeneration module 3, the gas catalytic oxidation reaction module 4 and the sensing detection module. The air inlet chamber 2 and the air outlet chamber 5 are respectively provided with a photo-ion detector, so that the total organic matter TVOC concentration of the inlet and outlet air is detected in real time, and the photo-ion detectors have the characteristics of small volume and quick response. The electrical appliance control module judges the total organic matter TVOC concentration value detected by the photo-ion detector through a computer, and can start the microporous gas adsorption regeneration module 3 and the gas catalytic oxidation reaction module 4 to work, so that the operation efficiency of the device is high and the energy consumption is low due to the optimized process parameters.
The invention designs a low-energy-consumption organic volatile gas treatment method, which comprises the following steps: and step 1, adsorbing VOCs gas with the concentration of 1-500PPM by using the microporous adsorption material. And 2, after the concentration of the gas adsorbed by the microporous adsorption material reaches saturation, the desorption regeneration heater heats the microporous adsorption material to desorb the VOCs adsorbed by the microporous adsorption material, and the microporous adsorption material regenerates and can continuously adsorb the VOCs gas. And step 3, starting a gas catalytic oxidation reaction module, performing catalytic oxidation reaction on the organic pollutants, decomposing VOCs into carbon dioxide and water, and discharging.
Most VOCs gas can volatilize and desorb at 70-200 ℃, and the concentration of VOCs in the gas outlet chamber is higher at the moment and can be generally in the range of 500-1000 PPM. When in heating regeneration, the gas catalytic oxidation reaction module is started at the same time, so that the desorbed VOCs can be effectively subjected to the gas catalytic oxidation reaction module to generate CO 2 And H 2 And (5) discharging O gas. The photoelectrocatalysis oxidation module mainly comprises plasma ionization or ultraviolet light activation, and is combined with a catalytic material, so that the VOCs oxidation efficiency can be further improved.
Example 1
When the concentration of VOCs is less than 200PPM, such as 50-200PPM, 10000m 3 The air volume per hour is exemplified by an area of about 10m 2 The adsorption material is microporous honeycomb oxide zeolite, the aperture is 3mm, the VOCs gas outlet concentration is within 5PPM, and the adsorption material can be saturated after about 30 hours. The heating and desorption start time of the microporous gas adsorption and regeneration module of the device is set at 3h, the temperature is set at 200 ℃, and the concentration of desorbed VOCs is in the range of 200-500 PPM. When the microporous gas adsorption regeneration module is heated and desorbed and started, the gas catalytic oxidation reaction module is started, an ultraviolet light source catalytic oxidation process is adopted, the power is 1kW, and at the moment, VOCs with higher concentration can be catalytically oxidized and decomposed into CO 2 And H 2 O, the treatment time is about 3 hours, so that the desorbed VOCs can be oxidatively decomposed. The whole energy consumption is about to be singly adoptedThe energy consumption of the photoelectrocatalytic oxidation treatment is about 15%, and the energy-saving benefit is remarkable.
Example 2
When the concentration of VOCs is less than 300PPM, such as in the concentration range of 100-300PPM, 10000m 3 The air volume per hour is exemplified by an area of about 20m 2 The microporous adsorption material is a microporous carbon fiber film, the thickness is 20mm, the outgassing concentration of VOCs is within 10PPM, and the microporous adsorption material can be saturated after being adsorbed for about 20 hours. The heating and desorption start time of the microporous gas adsorption regeneration module of the device is set at 4h, the temperature is set at 150 ℃, and the concentration of desorbed VOCs is in the range of 500-1000 PPM. When the microporous gas adsorption regeneration module is heated and desorbed and started, the gas catalytic oxidation reaction module is started, a plasma catalytic oxidation process is adopted, the power is 4kW, and the desorbed VOCs with higher concentration can be catalytically oxidized and decomposed into CO at the moment 2 And H 2 O, the treatment time is about 4 hours, so that the desorbed VOCs can be oxidatively decomposed. The energy consumption of the whole device is about 30 percent of the energy consumption of the single photoelectrocatalytic oxidation treatment, and the energy saving benefit is obvious.
Example 3
When the concentration of VOCs is less than 500PPM, such as 300-500PPM, 30000m 3 The air volume per hour is exemplified by an area of about 80m 2 The microporous adsorption material is microporous alumina honeycomb ceramic material, the pore diameter is 2mm, the VOCs gas outlet concentration is within 10PPM, and the adsorption material can be saturated after about 18 hours. The heating and desorption start time of the microporous gas adsorption and regeneration module of the device is set at 6h, the temperature is set at 180 ℃, and the concentration of desorbed VOCs is 600-1000 PPM. When the microporous gas adsorption regeneration module is started up through heating desorption, the gas catalytic oxidation reaction module is started up, a plasma catalytic oxidation process is adopted, the power is 6kW, and at the moment, VOCs with higher concentration can be catalytically oxidized and decomposed into CO 2 And H 2 O, the treatment time is about 6 hours, so that the desorbed VOCs can be oxidatively decomposed. The whole energy consumption is about 20% of the energy consumption of the single photoelectrocatalysis treatment, and the energy saving benefit is obvious.
The microporous gas adsorption regeneration module and the gas catalytic oxidation reaction module can be arbitrarily combined according to the needs. For example, adsorption regeneration by two groups of microporous gasesThe module and a group of gas catalytic oxidation reaction modules are used as a set of system, the two groups of microporous gas adsorption regeneration modules can work in a switching way, namely, one set of adsorption work is performed, the other set of adsorption regeneration work is performed, and the desorbed VOCs gas is processed into CO through the reaction of the gas catalytic oxidation reaction modules 2 And H 2 And the waste water is discharged after O, so that the treatment efficiency is high. If the concentration of VOCs in the inlet air is 300PPM, the first group of adsorption materials are adsorbed to saturation for about 20 hours, heating desorption is started, and meanwhile, a gas catalytic oxidation reaction module is started to carry out oxidative decomposition and desorption of the VOCs until the VOCs are discharged, and the adsorption materials can be regenerated after desorption for about 3 hours; when the first group of microporous gas adsorption and regeneration modules start to desorb, the air inlet VOCs are switched to the second group of microporous gas adsorption and regeneration modules to perform adsorption work, and when saturated, the air inlet VOCs are switched to the regeneration and desorption and gas catalytic oxidation reaction modules to perform reaction decomposition. The VOCs can be efficiently decomposed and removed by repeating the steps.
Claims (7)
1. The utility model provides a low energy consumption's organic volatile gas processing apparatus, includes micropore gas adsorption regeneration module, gaseous catalytic oxidation reaction module, sensing detection module, power and electrical apparatus control module, its characterized in that: a group of microporous gas adsorption regeneration modules (3) and a group of gas catalytic oxidation reaction modules (4) are arranged between the gas inlet chamber (2) and the gas outlet chamber (5), the sensing detection modules are respectively arranged in the gas inlet chamber (2) and the gas outlet chamber (5), the input and output ends of the sensing detection modules are connected with the signal transmission control ends of the power supply and electric appliance control modules (7), and the power output ends of the power supply and electric appliance control modules (7) are respectively connected with the input ends of the microporous gas adsorption regeneration modules (3) and the input ends of the gas catalytic oxidation reaction modules (4);
the microporous gas adsorption regeneration module (3) comprises an adsorption material bracket (10), a desorption regeneration heater (11) and a microporous adsorption material (12), wherein the desorption regeneration heater (11) is arranged on the upper surface and the lower surface of the adsorption material bracket (10), the microporous adsorption material (12) is arranged on the surface of the desorption regeneration heater (11), the desorption regeneration heater (11) is connected with a power supply and an electric appliance control module (7), the desorption regeneration heater (11) adopts resistance type or high-frequency induction type heating, and the highest temperature is less than or equal to 200 ℃;
the microporous adsorption material (12) is formed by a specific surface of more than or equal to 500m 2 The microporous adsorption material (12) has the function of adsorbing VOCs and is any one or more than one mixture of microporous carbon particles, fibers, carbon nanotubes, carbon nanofibers, carbon aerogel, graphene, alumina, silica, magnesia or zeolite nanofibers, aerogel, molecular sieves and particles; the microporous adsorption material (12) is of a film structure with the thickness of 10-50mm, or a spherical or bar-shaped granular structure with the size of 1-10mm, or a honeycomb tubular cube or cylinder structure with the aperture of 1-10 mm;
the microporous adsorption material (12) and the adsorption material support (10) are of a parallel plate type array structure, and a gas channel is arranged between the microporous adsorption material (12) and the adsorption material support (10), and the distance between the gas channels is 2-20mm.
2. A low energy organic volatile gas processing apparatus according to claim 1, wherein: the catalytic material of the gas catalytic oxidation reaction module (4) is WO 3 、CuO、SnO 2 、TiO 2 、ZnO、MgO、CaO、Fe 2 O 3 、MnO 2 、Mn 3 O 4 、V 2 O 5 At least one metal oxide in NiO, the catalytic material is composed of nano-structure crystals with the particle size of 10-100nm, and the shape is flake, sphere, column or fiber.
3. A low energy organic volatile gas processing apparatus according to claim 2, wherein: the metal oxide is doped with at least one element of Pt, pd, au, ag, cu, fe, N, F, C.
4. A low energy organic volatile gas processing apparatus according to claim 1, wherein: by a means ofThe gas catalytic oxidation reaction module (4) comprises a plasma catalytic reaction chamber composed of a pair of or more cathodes and anodes, wherein the cathodes and the anode substrates are arranged in parallel, a quartz or alumina ceramic dielectric layer with the thickness of 0.1-3mm is arranged between the cathodes and the anodes, a high-frequency alternating current power supply with the frequency of 10-100kHz and the voltage of 0.5-20kV is connected between the cathodes and the anodes, and the current density between the electrodes is 0.01-10mA/cm 2 。
5. A low energy organic volatile gas processing apparatus according to claim 1, wherein: the gas catalytic oxidation reaction module (4) is a photoelectrocatalytic oxidation reaction chamber which consists of one or more ultraviolet light sources and catalytic materials, wherein the ultraviolet light sources adopt electrodeless quartz lamps, the wavelength is 250-400nm, the power of unit light sources is 0.1-2kW, and high-frequency or microwave induction luminescence is adopted.
6. A low energy organic volatile gas processing apparatus according to claim 1, wherein: the sensing detection module consists of a photo-ion detector PID and a temperature sensor TC, wherein the total concentration TVOC range detected by the photo-ion detector PID is 1-5000PPM, the temperature range detected by the temperature sensor TC is 0-500 ℃, and the power range of the power supply and electric appliance control module (7) is 10-10000W.
7. A low-energy-consumption organic volatile gas treatment method is characterized in that: the apparatus of claim 1, comprising the steps of step 1, adsorbing VOCs gas with a concentration of 1-500PPM by a microporous adsorption material, step 2, heating the microporous adsorption material by a desorption regeneration heater after the concentration of the gas adsorbed by the microporous adsorption material reaches saturation, desorbing VOCs adsorbed by the microporous adsorption material, regenerating the microporous adsorption material and continuing to adsorb VOCs gas, and step 3, starting a gas catalytic oxidation reaction module, performing catalytic oxidation reaction on organic pollutants, decomposing VOCs into carbon dioxide and water, and discharging.
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