CN104857824A - Waste gas processing method and device collaborating vacuum ultraviolet light catalysis and ozone catalytic oxidation - Google Patents
Waste gas processing method and device collaborating vacuum ultraviolet light catalysis and ozone catalytic oxidation Download PDFInfo
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- CN104857824A CN104857824A CN201510279052.1A CN201510279052A CN104857824A CN 104857824 A CN104857824 A CN 104857824A CN 201510279052 A CN201510279052 A CN 201510279052A CN 104857824 A CN104857824 A CN 104857824A
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- 230000003197 catalytic Effects 0.000 title claims abstract description 131
- CBENFWSGALASAD-UHFFFAOYSA-N ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 title claims abstract description 112
- 239000002912 waste gas Substances 0.000 title claims abstract description 40
- 230000003647 oxidation Effects 0.000 title claims abstract description 37
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 37
- 238000003672 processing method Methods 0.000 title claims abstract description 12
- 238000006555 catalytic reaction Methods 0.000 title abstract 7
- 239000003054 catalyst Substances 0.000 claims abstract description 128
- 239000002131 composite material Substances 0.000 claims abstract description 89
- 239000011941 photocatalyst Substances 0.000 claims abstract description 35
- 239000007789 gas Substances 0.000 claims abstract description 29
- 239000003344 environmental pollutant Substances 0.000 claims abstract description 16
- 231100000719 pollutant Toxicity 0.000 claims abstract description 16
- 230000001590 oxidative Effects 0.000 claims description 56
- 238000006385 ozonation reaction Methods 0.000 claims description 50
- 239000007800 oxidant agent Substances 0.000 claims description 49
- 230000001699 photocatalysis Effects 0.000 claims description 30
- 238000007146 photocatalysis Methods 0.000 claims description 27
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims description 21
- 239000000356 contaminant Substances 0.000 claims description 13
- 238000011109 contamination Methods 0.000 claims description 11
- 238000010574 gas phase reaction Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 8
- 238000000197 pyrolysis Methods 0.000 claims description 8
- 229910052813 nitrogen oxide Inorganic materials 0.000 claims description 7
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N al2o3 Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 4
- 239000000969 carrier Substances 0.000 claims description 4
- 239000002808 molecular sieve Substances 0.000 claims description 4
- 239000012429 reaction media Substances 0.000 claims description 4
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 3
- 229910052803 cobalt Inorganic materials 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 229910052748 manganese Inorganic materials 0.000 claims description 3
- 239000003595 mist Substances 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- 229910000314 transition metal oxide Inorganic materials 0.000 claims description 3
- 239000012535 impurity Substances 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 106
- UGFAIRIUMAVXCW-UHFFFAOYSA-N carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 18
- UHOVQNZJYSORNB-UHFFFAOYSA-N benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 12
- 230000015556 catabolic process Effects 0.000 description 10
- 230000004059 degradation Effects 0.000 description 10
- 238000006731 degradation reaction Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 10
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- 230000033558 biomineral tissue development Effects 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- MYMOFIZGZYHOMD-UHFFFAOYSA-N oxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 4
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- 229910052782 aluminium Inorganic materials 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminum Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000003421 catalytic decomposition reaction Methods 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
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- RAHZWNYVWXNFOC-UHFFFAOYSA-N sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
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- 229920002521 Macromolecule Polymers 0.000 description 1
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Abstract
The invention discloses a waste gas processing method and device collaborating vacuum ultraviolet light catalysis with ozone catalytic oxidation. The waste gas processing method comprises the following steps: after particulate impurities in waste gas are removed, the waster gas enters a vacuum ultraviolet light catalysis chamber; a pollutant is directly split by the ultraviolet light emitted by an ultraviolet lamp, and free radicals with high oxidizability and ozone substances are generated at the same time so as to further oxidize the pollutant; in a composite catalyst structure formed by compounding a photocatalyst layer and an ozone catalyst layer, the residual pollutant is further purified through the collaboration of vacuum ultraviolet light catalysis and ozone catalytic oxidation, and the ozone is totally utilized and eliminated at the same time. The waste gas processing device comprises a reactor, wherein an efficient filter and the composite catalyst structure are arranged in the reactor; the composite catalyst structure is formed by compounding the photocatalyst layer and the ozone catalyst layer; the light catalysis chamber is formed at the inner cavity zone between the efficient filter and the composite catalyst structure, and the ultraviolet lamp is arranged in the light catalysis chamber. The waste gas is purified by utilizing the collaboration of vacuum ultraviolet light catalysis and ozone catalytic oxidation.
Description
Technical field
The invention belongs to organic exhaust gas, stench, SO
2and NO
xprocessing technology field, specifically refers to waste gas processing method and the device of vacuum-ultraviolet light catalyzing cooperation catalytic ozonation.
Background technology
Along with rapid industrial development, energy resource constantly consumes, and atmospheric environment problem becomes increasingly conspicuous.Passing people are it is well known that sulfur dioxide, nitrogen oxide, and volatile organic matter (VOC) is a kind of unheeded important pollutant in the past.Although volatile organic matter does not directly form PM2.5, can form PM2.5 by photochemical reaction, be one of important presoma of haze formation, kind is complicated, relates to industry numerous, is also extensively present in indoor human settlement and human activity process.
At present, VOCs administers and has drawn attention and brought into schedule, is subject to the extensive concern of government and people, and the Treatment process of research and development wide accommodation, efficient stable is extremely urgent.Although country payes attention to industrial SO
2and NO
xadminister, but always out in the cold thus affect human health on part place.Underground parking, highway subterranean tunnel etc. also constantly towards periphery Environment release containing SO
2, NOx burnt gas, harm environment around and the health of the mankind.The pollution of atmospheric environment also involves the indoor environment of the daily existence of people.Indoor environment and human lives's daily life closely bound up, the requirement of people to indoor air quality is also more and more higher, therefore, SO in air
2, NOx pollution control receive increasing concern.
In addition, in recent years, along with the development of producing, China's city odor pollution is more and more serious, is subject to various countries in the world and payes attention to widely, by one of many countries six large public hazards thinking to be only second to noise.Because the requirement of people to living environment quality is more and more higher, but the general threshold value of odorant is lower.Therefore, the control of stench has just put on the agenda.
Current National various places are constantly stepping up to formulate toxic emission professional standard, and for adapting to stricter energy-conserving and environment-protective requirement, recent year researchs and develops some novel environment friendly Treatment process, but still there is many defects.
Chinese utility model patent CN202983486U discloses a kind of integrated purifying equipment processing complex industrial organic exhaust gas, wherein react in casing and be disposed with electrostatic precipitator, photocatalytic reaction device, ozone generator and adsorption bed, the integrated purifying equipment of this process complex industrial organic exhaust gas, need ozone generator is installed, adsorption layer only has adsorption and enrichment ozonization, adsorb saturated after there is residual ozone secondary pollution, potential risk is high, and the single limited not efficiency utilization of ozonidation, adsorption layer also needs periodic replacement simultaneously.
Chinese invention patent CNIO3585865A discloses a kind of light oxygen purifying exhaust air treating apparatus, comprise for the filter microwave generator of filter particulate material, active oxygen ultraviolet lamp germicidal ultraviolet lamp and multiple matrix with photocatalyst coating, wherein active oxygen ultraviolet lamp is the ultraviolet lamp of transmitting 185 nm W, there is the defect that the secondary pollution such as residual ozone and intermediate by-products and ozone resource are not efficiently utilized.
Chinese invention patent CN1951544A discloses a kind of method and apparatus utilizing photochemical degradation of organic gas, ozone, ultraviolet or ozone is utilized separately to add the method for ultra-violet oxidation organic gas, same existence oxidation does not thoroughly form the defects such as intermediate product secondary pollution, and ozone concentration controls the improper risk that there is residual ozone simultaneously.
Chinese invention patent CN102247750 discloses a kind of liquid phase catalytic ozonation method to the apparatus and method of flue gas and desulfurizing and denitrifying, is configured with ozone generator, energy consumption is high, complex structure in this device.
Summary of the invention
An object of the present invention is to provide a kind of waste gas processing method of vacuum-ultraviolet light catalyzing cooperation catalytic ozonation, carrys out purifying exhaust air by the synergy of ultraviolet catalytic oxidation and catalytic ozonation.
This purpose of the present invention realizes by following technical solution: the waste gas processing method of vacuum-ultraviolet light catalyzing cooperation catalytic ozonation, it is characterized in that, the method comprises the steps:
(1) waste gas is removed through high efficiency particulate air filter and is entered in vacuum-ultraviolet light catalyst chamber after particulate contaminant;
(2) waste gas generation gas-phase reaction in vacuum-ultraviolet light catalyst chamber, the high energy UV By Direct Pyrolysis pollutant that gas-phase reaction medium ultraviolet lamp sends, produces strong oxidizing property free radical and the further oxidize contaminants of ozone material simultaneously;
(3) after step (2) process, the amounts of residual contamination that obtains and ozone enter the composite catalyst structure that photocatalyst layer and ozone catalytic oxidant layer be compounded to form, purify amounts of residual contamination further by the synergy of ultraviolet catalytic oxidation and catalytic ozonation, utilize completely and eliminate ozone simultaneously.
Waste gas processing method of the present invention utilizes ultraviolet catalytic oxidation and catalytic ozonation to replace synergy to carry out high-efficient purification waste gas, solve conventional exhaust treatment cost, energy consumption is high, degrade not thorough, there is secondary pollution problems, make full use of the efficient mineralization effect of catalytic ozonation, avoid the waste of ozone resource, have that structure is simple, efficient stable, energy consumption are low, non-secondary pollution, detergent power have the advantages such as controllability, the purification of industrial organic exhaust gas and stench can be widely used in, also can also can be used for indoor air purification field simultaneously.
Two of object of the present invention is to provide a kind of emission-control equipment of vacuum-ultraviolet light catalyzing cooperation catalytic ozonation, carrys out purifying exhaust air by the synergy of ultraviolet catalytic oxidation and catalytic ozonation.
This purpose of the present invention realizes by following technical solution: the emission-control equipment of vacuum-ultraviolet light catalyzing cooperation catalytic ozonation, it is characterized in that: this device comprises reactor, this reactor has air inlet, gas outlet and cylindrical shell, high efficiency particulate air filter and composite catalyst structure is built-in with along gas flow direction in described cylindrical shell, described high efficiency particulate air filter and composite catalyst structure are all arranged along cylindrical shell radial direction, described composite catalyst structure is compounded to form by photocatalyst layer and ozone catalytic oxidant layer, cylindrical shell forms photocatalysis room in the cavity region between high efficiency particulate air filter and composite catalyst structure, photocatalysis indoor are provided with uviol lamp along cylindrical shell radial direction, described gas outlet is connected with air-introduced machine, this device utilizes the synergy of ultraviolet catalytic oxidation and catalytic ozonation to carry out purifying exhaust air.
Emission-control equipment of the present invention is provided with the composite catalyst structure and uviol lamp that are compounded to form by photocatalyst layer and ozone catalytic oxidant layer, the alternately synergy of outer photochemical catalytic oxidation and catalytic ozonation is utilized to carry out high-efficient purification waste gas, in photocatalysis room, the high energy UV By Direct Pyrolysis pollutant that uviol lamp sends, produces strong oxidizing property free radical and the further oxidize contaminants of ozone material simultaneously; During amounts of residual contamination and ozone enter, to be acted synergistically further purifying contaminated thing by ultraviolet catalytic oxidation and catalytic ozonation, utilize completely and eliminate residual ozone simultaneously.
Emission-control equipment of the present invention combines the multiple-effect of the catalytic oxidation activity utilizing ultraviolet catalytic degradation of contaminant and ozone, the light degradation of efficiency utilization vacuum UV lamp, photocatalysis, the synergy of free-radical oxidation, ozone oxidation, catalytic ozonation, especially the efficient mineralization effect of catalytic ozonation, make full use of ozone, avoid the wasting of resources.In the present invention, described composite catalyst structure comprises an end composite catalyst unit, described end composite catalyst unit is the double-layer catalyst layer that one deck photocatalyst layer and one deck ozone catalytic oxidant layer are compounded to form, this end composite catalyst unit is positioned at the tail end of cylindrical shell near gas outlet, described high efficiency particulate air filter is positioned at the head end of cylindrical shell near air inlet, and cylindrical shell is one in the photocatalysis room that the cavity region between described high efficiency particulate air filter and end composite catalyst unit is formed.
In the present invention, the ozone catalytic oxidant layer in described end composite catalyst unit is thick-layer ozone catalytic oxidant layer.
The present invention can do following improvement: described composite catalyst structure also comprises at least one stage casing composite catalyst unit, stage casing composite catalyst unit is between described high efficiency particulate air filter and end composite catalyst unit, cylindrical shell is separated at least two photocatalysis rooms in the cavity region between high efficiency particulate air filter and end composite catalyst unit, each photocatalysis indoor are provided with uviol lamp along cylindrical shell radial direction, described stage casing composite catalyst unit is arranged along cylindrical shell radial direction, described stage casing composite catalyst unit is that two-layer photocatalyst layer and one deck ozone catalytic oxidant layer are composited, wherein one deck ozone catalytic oxidant layer is positioned at centre, two-layer photocatalyst layer is positioned at both sides, the stage casing composite catalyst unit be compounded to form thus is sandwich three layers of catalyst layer.
Stage casing composite catalyst unit in the present invention is sandwich three layers of catalyst layer, the photocatalyst layer of both sides can make full use of ultraviolet light and realize photochemical catalytic oxidation, middle ozone catalytic oxidant layer can be eliminated and utilize ozone, by the further waste gas decomposition of catalytic ozonation effect.
In the present invention, described stage casing composite catalyst unit is two, and cylindrical shell is separated into three photocatalysis rooms in the cavity region between high efficiency particulate air filter and end composite catalyst unit.
In the present invention, the ozone catalytic oxidant layer in described stage casing composite catalyst unit is thin layer ozone catalytic oxidant layer.
In the present invention, described uviol lamp is vacuum UV lamp or microwave electrodeless lamp, and wavelength is 185nm, and installation direction and waste gas streams, to vertical, suitably can increase and decrease uviol lamp group quantity according to Exhaust gas species, concentration and flow.
In the present invention, the photochemical catalyst in described photocatalyst layer is TiO
2, shape is cellular or is filled by pellet type catalyst or be carried in stainless steel, aluminium net and make; Described ozone catalytic oxidant layer is at molecular sieve, SiO
2or load has the catalyst layer of the single or composite transition metal oxide of Mn, Ni, Co, Cu on active aluminum oxide carrier, shape is cellular or is filled in stainless (steel) wire by pellet type catalyst and makes.
In the present invention, described waste gas comprises organic exhaust gas, foul gas, SO
2, nitrogen oxide or organic exhaust gas, stench, SO
2, nitrogen oxide mist.
In the present invention, when pollutant levels are lower, can closed portion vacuum UV lamp, or adopt ozone catalyst single layer structure; When pollutant levels are higher, vacuum-ultraviolet light catalytic module and sandwich recombination catalyst layer quantity can be added, can also ozone generator be added, after the ozone of generation mixes with waste gas, enter reaction chamber body.
Described waste gas enters vacuum-ultraviolet light catalyst chamber after gas phase light degradation, free radical and ozone oxidation, amounts of residual contamination and ozone enter sandwich recombination catalyst layer, by photochemical catalytic oxidation-catalytic ozonation-photochemical catalytic oxidation alternative expression synergy purification further.
When this emission-control equipment only has a photocatalysis room, composite catalyst structure only comprises an end composite catalyst unit, be photocatalyst layer and one deck ozone catalytic oxidant layer according to gas flow, when this emission-control equipment has two or more photocatalysis rooms, composite catalyst structure is except comprising an end composite catalyst unit, also comprise at least one stage casing composite catalyst unit, therefore, it is possible to utilize the alternately synergy of VUV photochemical catalytic oxidation and catalytic ozonation to carry out high-efficient purification waste gas, the high energy UV By Direct Pyrolysis pollutant that vacuum UV lamp sends, produce strong oxidizing property free radical and the further oxidize contaminants of ozone material simultaneously, amounts of residual contamination and ozone enter sandwich recombination catalyst layer, to be acted synergistically further purifying contaminated thing by photochemical catalytic oxidation-catalytic ozonation-photochemical catalytic oxidation alternative expression, utilize completely and eliminate residual ozone simultaneously.
Described vacuum-ultraviolet light catalyst chamber can single chamber, two Room or multicell, suitably increase and decrease vacuum-ultraviolet light catalyst chamber and sandwich recombination catalyst layer according to Exhaust gas species, concentration and uninterrupted;
Compared with prior art, the present invention has following remarkable result:
(1) waste gas processing method of vacuum-ultraviolet light catalyzing cooperation catalytic ozonation that proposes of the present invention and device, solve low, the thorough problem such as easily generation intermediate product secondary pollution and residual ozone potential risk etc. of degradation efficiency in traditional light degradation and photocatalysis improvement waste gas, avoid the waste of ozone resource simultaneously;
(2) the present invention adopts the multiple-effect utilizing the catalytic oxidation activity of VUV photocatalytic pollutant degradation and ozone, the light degradation of efficiency utilization vacuum UV lamp, photocatalysis, the synergy of free radical and ozone oxidation, catalytic ozonation, mineralization rate is high, degraded is thorough, efficient stable.
(3) emission-control equipment in the present invention is according to exhaust emission species, concentration level and air force, simple to operate, and service ability has controllability, can be widely used in the improvement of complex industrial organic exhaust gas, stench and room air.
Accompanying drawing explanation
Below in conjunction with accompanying drawing and instantiation, the present invention is described in further detail.
Fig. 1 is the overall structure schematic diagram of emission-control equipment embodiment one of the present invention;
Fig. 2 is the overall structure schematic diagram of emission-control equipment embodiment two of the present invention;
Fig. 3 is the overall structure schematic diagram of emission-control equipment embodiment three of the present invention.
Description of reference numerals
1, reactor; 11, air inlet; 12, gas outlet; 13, cylindrical shell; 2, high efficiency particulate air filter;
3, photocatalysis room; 4, uviol lamp; 5, air-introduced machine; 6, photocatalyst layer;
7, thick-layer ozone catalytic oxidant layer; 8, thin layer ozone catalytic oxidant layer; 9, escape pipe;
101, end composite catalyst unit; 102, stage casing composite catalyst unit
Detailed description of the invention
Embodiment 1
The embodiment one of the emission-control equipment of vacuum-ultraviolet light catalyzing cooperation catalytic ozonation of the present invention as shown in Figure 1, this device comprises reactor 1, this reactor 1 has air inlet 11, gas outlet 12 and cross section are rectangular cylindrical shell 13, high efficiency particulate air filter 2 and composite catalyst structure is built-in with along gas flow direction in cylindrical shell 13, gas flow direction is also just the axis of cylindrical shell 13, high efficiency particulate air filter 2 and composite catalyst structure are all arranged along cylindrical shell 13 radial direction, composite catalyst structure is compounded to form by photocatalyst layer 6 and ozone catalytic oxidant layer, cylindrical shell 13 forms photocatalysis room 3 in the cavity region between high efficiency particulate air filter 2 and composite catalyst structure, in photocatalysis room 3, cylindrical shell 13 radial direction is provided with uviol lamp 4, uviol lamp 4 selects wavelength to be the vacuum UV lamp of 185nm, also wavelength can be selected to be the microwave electrodeless lamp of 185nm, gas outlet 12 is connected with air-introduced machine 5, air-introduced machine 5 is also communicated with escape pipe 9, air-introduced machine 5 air quantity is adjustable, adjustable range is 800-1000m
3/ h.This device utilizes the synergy of ultraviolet catalytic oxidation and catalytic ozonation to carry out purifying exhaust air.
In the present embodiment, composite catalyst structure comprises an end composite catalyst unit 101, end composite catalyst unit 101 is the double-layer catalyst layer that one deck photocatalyst layer 6 and one deck ozone catalytic oxidant layer are compounded to form, this one deck ozone catalytic oxidant layer is thick-layer ozone catalytic oxidant layer 7, this end composite catalyst unit 101 is positioned at the tail end of cylindrical shell 13 near gas outlet 12, high efficiency particulate air filter 2 is positioned at the head end of cylindrical shell 13 near air inlet 11, cylindrical shell 13 is one in the photocatalysis room 3 that the cavity region between high efficiency particulate air filter 2 and end composite catalyst unit 101 is formed.
In the present embodiment, the photochemical catalyst in photocatalyst layer 6 is TiO
2, shape is cellular; Ozone catalytic oxidant layer is MnO
2/ ZSM-5, shape is cellular.
As the conversion of the present embodiment, cylindrical shell 13 also can select cross section to be foursquare structure, and cylindrical shell 13, except selecting rectangular cylinder, also can select cross section to be circular cylindrical drum.
As the conversion of the present embodiment, photocatalyst layer can select pure TiO
2or load has TiO on molecular sieve, silica or active aluminum oxide carrier
2catalyst, the shape of photocatalyst layer is cellular or is filled by pellet type catalyst or be carried in stainless steel, aluminium net and make, and ozone catalytic oxidant layer can be selected as at molecular sieve, SiO
2or load has the catalyst of the single or composite transition metal oxide of Mn, Ni, Co, Cu on active aluminum oxide carrier, the shape of photocatalyst layer is cellular or is filled in stainless (steel) wire by pellet type catalyst and makes.
The manageable waste gas of emission-control equipment of the present embodiment comprises organic exhaust gas, foul gas, SO
2, nitrogen oxide or organic exhaust gas, stench, SO
2, nitrogen oxide mist.
Adopt the device of the present embodiment to carry out the waste gas processing method of vacuum-ultraviolet light catalyzing cooperation catalytic ozonation, the method comprises the steps:
(1) waste gas is removed after particulate contaminant through high efficiency particulate air filter 2 and is entered in vacuum-ultraviolet light catalyst chamber 3;
(2) waste gas generation gas-phase reaction in vacuum-ultraviolet light catalyst chamber 3, the high energy UV By Direct Pyrolysis pollutant that gas-phase reaction medium ultraviolet lamp 4 sends, produces strong oxidizing property free radical and the further oxidize contaminants of ozone material simultaneously;
(3) after step (2) process, the amounts of residual contamination that obtains and ozone enter the composite catalyst structure that photocatalyst layer 6 and ozone catalytic oxidant layer be compounded to form, purify amounts of residual contamination further by the synergy of ultraviolet catalytic oxidation and catalytic ozonation, utilize completely and eliminate ozone simultaneously.
Embodiment 2
The embodiment two of the emission-control equipment of vacuum-ultraviolet light catalyzing cooperation catalytic ozonation of the present invention as shown in Figure 2, with embodiment one unlike, composite catalyst structure also comprises a stage casing composite catalyst unit 102, this stage casing composite catalyst unit 102 is between high efficiency particulate air filter 2 and end composite catalyst unit 101, cylindrical shell 13 is separated into two photocatalysis rooms 3 in the cavity region between high efficiency particulate air filter 2 and end composite catalyst unit 101, uviol lamp 4 is provided with along cylindrical shell 13 radial direction in each photocatalysis room 3, uviol lamp 4 selects wavelength to be the vacuum UV lamp of 185nm, stage casing composite catalyst unit 102 is arranged along cylindrical shell 13 radial direction, stage casing composite catalyst unit 102 is composited for two-layer photocatalyst layer 6 and one deck ozone catalytic oxidant layer, wherein one deck ozone catalytic oxidant layer is positioned at centre, two-layer photocatalyst layer 6 is positioned at both sides, the stage casing composite catalyst unit 102 be compounded to form thus is sandwich three layers of catalyst layer.
Ozone catalytic oxidant layer in stage casing composite catalyst unit 102 is thin layer ozone catalytic oxidant layer 8.Photocatalyst layer in stage casing composite catalyst unit 102 is identical with the photocatalyst layer in end composite catalyst unit 101, thin layer ozone catalytic oxidant layer 8 is also identical with structure with the material of thick-layer ozone catalytic oxidant layer 7, and just the thickness of thick-layer ozone catalytic oxidant layer 7 is 1.5 times of thin layer ozone catalytic oxidant layer 8.
Thin layer ozone catalytic oxidant layer 8 in the application is relative concept with the thickness in thick-layer ozone catalytic oxidant layer 7, comparatively speaking, do not overemphasize, determine according to concrete exhaust gas concentration flow, and the concrete thickness of thin layer ozone catalytic oxidant layer 8 and thick-layer ozone catalytic oxidant layer 7 is also adjust according to the concrete condition of concrete exhaust gas concentration flow.
As the conversion of the present embodiment, stage casing composite catalyst unit 102 in composite catalyst structure is at least one, cylindrical shell 13, all between high efficiency particulate air filter 2 and end composite catalyst unit 101, is separated at least two photocatalysis rooms 3 in the cavity region between high efficiency particulate air filter 2 and end composite catalyst unit 101 by multiple stage casings composite catalyst unit 102.
In the present embodiment, uviol lamp 4 is selected as wavelength is the vacuum UV lamp group of 185nm, and quantity three, photocatalyst layer 6 is TiO
2catalyst, ozone catalytic oxidant layer is MnO
2/ ZSM-5, air-introduced machine air quantity is adjustable, and adjustable range is 800-1000m
3/ h.
The emission-control equipment of the present embodiment utilizes the alternately synergy of VUV photochemical catalytic oxidation and catalytic ozonation to carry out high-efficient purification waste gas, waste gas is removed through high efficiency particulate air filter and is entered in the vacuum-ultraviolet light catalyst chamber of internally provided with vacuum uviol lamp after particulate contaminant, the high energy UV By Direct Pyrolysis pollutant that vacuum UV lamp sends, produces strong oxidizing property free radical and the further oxidize contaminants of ozone material simultaneously; Remaining pollutant and ozone enter sandwich three layers of catalyst layer, in this sandwich three layers of catalyst layer, the photocatalyst layer of both sides can make full use of ultraviolet light and realize photochemical catalytic oxidation, middle ozone catalytic oxidant layer can be eliminated and utilize ozone, by the further waste gas decomposition of catalytic ozonation effect, to be acted synergistically further purifying contaminated thing by the alternative expression of photochemical catalytic oxidation-catalytic ozonation-photochemical catalytic oxidation, utilize completely and eliminate residual ozone simultaneously, the object reaching process waste gas can make full use of resource again simultaneously, meets environmental requirement.
The emission-control equipment of the present embodiment combines the multiple-effect of the catalytic oxidation activity utilizing VUV photocatalytic pollutant degradation and ozone, the light degradation of efficiency utilization vacuum UV lamp, photocatalysis, the synergy of free-radical oxidation, ozone oxidation, catalytic ozonation, especially the efficient mineralization effect of catalytic ozonation, make full use of ozone, avoid the wasting of resources.
Adopt the device of the present embodiment to carry out the waste gas processing method of vacuum-ultraviolet light catalyzing cooperation catalytic ozonation, the method comprises the steps:
(1) waste gas is removed after particulate contaminant through high efficiency particulate air filter 2 and is entered in vacuum-ultraviolet light catalyst chamber 3;
(2) waste gas generation gas-phase reaction in vacuum-ultraviolet light catalyst chamber 3, the high energy UV By Direct Pyrolysis pollutant that gas-phase reaction medium ultraviolet lamp 4 sends, produces strong oxidizing property free radical and the further oxidize contaminants of ozone material simultaneously;
(3) after step (2) process, the amounts of residual contamination that obtains and ozone enter the composite catalyst structure that photocatalyst layer 6 and ozone catalytic oxidant layer be compounded to form, purify amounts of residual contamination further by the synergy of ultraviolet catalytic oxidation and catalytic ozonation, utilize completely and eliminate ozone simultaneously.
The emission-control equipment of the present embodiment is adopted to process following two kinds of waste gas.
(if any more waste gas place reason example, also asks applicant to provide together)
Example 1
Exhaust gas parameters: flow 800-1000m
3/ h, polluter component benzene and benzene homologues, concentration 30-50ppm, relative humidity is 50%, temperature 25-35 DEG C.
When emission-control equipment runs, open blower fan and vacuum UV lamp by controlling electric cabinet, after organic exhaust gas removes the impurity such as particle through high efficiency filter layer, enter vacuum-ultraviolet light catalyst chamber, in gas-phase reaction, benzene and benzene homologues part are completely degraded as CO
2and water, and form ozone, the benzene be not degraded and benzene homologues and ozone, through photochemical catalyst-ozone catalyst-photocatalyst layer, by the synergy such as photochemical catalytic oxidation, catalytic ozonation, are oxidized to CO further
2and water, finally again by ozone catalytic oxidant layer, catalytic ozonation remains organic pollution and catalytic decomposition residual ozone completely further, by gas outlet discharge atmospheric environment after organic exhaust gas is purified.Running, clean-up effect is stable, purification efficiency is up to 100%.
Example 2
Exhaust gas parameters: flow 800-1000m
3/ h, polluter component H
2s, methyl mercaptan, concentration 100-150ppm, relative humidity is 50%, temperature 25-35 DEG C.
When emission-control equipment runs, blower fan and vacuum UV lamp is opened by controlling electric cabinet, after foul gas removes the impurity such as particle through high efficiency filter layer, enter vacuum-ultraviolet light catalyst chamber, form free radical and ozone and vacuum-ultraviolet light By Direct Pyrolysis in gas-phase reaction when photodissociation oxygen and steam and be oxidized odorant strand, change the structure of matter, by the cracking of macromolecule polluter, be oxidized to low molecule innocuous substance, residue foul gas and ozone are through photochemical catalyst-ozone catalyst-photocatalyst layer, by photochemical catalytic oxidation, catalytic ozonation, the synergies such as free-radical oxidation, oxidized further, eventually through ozone catalytic oxidant layer, catalytic ozonation remains foul gas and catalytic decomposition residual ozone completely further, by in gas outlet discharge atmospheric environment after foul gas is purified.Running, deodorization efficiency is up to 99%.
Embodiment 3
The embodiment three of the emission-control equipment of vacuum-ultraviolet light catalyzing cooperation catalytic ozonation of the present invention as shown in Figure 3, with embodiment two unlike, stage casing composite catalyst unit 102 is two, and cylindrical shell 13 is separated into three photocatalysis rooms 3 in the cavity region between high efficiency particulate air filter 2 and end composite catalyst unit 101.
The above embodiment of the present invention is not limiting the scope of the present invention; embodiments of the present invention are not limited thereto; all this kind is according to foregoing of the present invention; according to ordinary technical knowledge and the customary means of this area; do not departing under the present invention's above-mentioned basic fundamental thought prerequisite; to the amendment of other various ways that said structure of the present invention is made, replacement or change, all should drop within protection scope of the present invention.
Claims (10)
1. the waste gas processing method of vacuum-ultraviolet light catalyzing cooperation catalytic ozonation, is characterized in that, the method comprises the steps:
(1) waste gas is removed through high efficiency particulate air filter and is entered in vacuum-ultraviolet light catalyst chamber after particulate contaminant;
(2) waste gas generation gas-phase reaction in vacuum-ultraviolet light catalyst chamber, the high energy UV By Direct Pyrolysis pollutant that gas-phase reaction medium ultraviolet lamp sends, produces strong oxidizing property free radical and the further oxidize contaminants of ozone material simultaneously;
(3) after step (2) process, the amounts of residual contamination that obtains and ozone enter the composite catalyst structure that photocatalyst layer and ozone catalytic oxidant layer be compounded to form, purify amounts of residual contamination further by the synergy of ultraviolet catalytic oxidation and catalytic ozonation, utilize completely and eliminate ozone simultaneously.
2. the emission-control equipment of vacuum-ultraviolet light catalyzing cooperation catalytic ozonation, it is characterized in that: this device comprises reactor, this reactor has air inlet, gas outlet and cylindrical shell, high efficiency particulate air filter and composite catalyst structure is built-in with along gas flow direction in described cylindrical shell, described high efficiency particulate air filter and composite catalyst structure are all arranged along cylindrical shell radial direction, described composite catalyst structure is compounded to form by photocatalyst layer and ozone catalytic oxidant layer, cylindrical shell forms photocatalysis room in the cavity region between high efficiency particulate air filter and composite catalyst structure, photocatalysis indoor are provided with uviol lamp along cylindrical shell radial direction, described gas outlet is connected with air-introduced machine, this device utilizes the synergy of ultraviolet catalytic oxidation and catalytic ozonation to carry out purifying exhaust air.
3. the emission-control equipment of vacuum-ultraviolet light catalyzing cooperation catalytic ozonation according to claim 2, it is characterized in that: described composite catalyst structure comprises an end composite catalyst unit, described end composite catalyst unit is the double-layer catalyst layer that one deck photocatalyst layer and one deck ozone catalytic oxidant layer are compounded to form, this end composite catalyst unit is positioned at the tail end of cylindrical shell near gas outlet, described high efficiency particulate air filter is positioned at the head end of cylindrical shell near air inlet, cylindrical shell is one in the photocatalysis room that the cavity region between described high efficiency particulate air filter and end composite catalyst unit is formed.
4. the emission-control equipment of vacuum-ultraviolet light catalyzing cooperation catalytic ozonation according to claim 3, is characterized in that: the ozone catalytic oxidant layer in described end composite catalyst unit is thick-layer ozone catalytic oxidant layer.
5. the emission-control equipment of vacuum-ultraviolet light catalyzing cooperation catalytic ozonation according to claim 3, it is characterized in that: described composite catalyst structure also comprises at least one stage casing composite catalyst unit, stage casing composite catalyst unit is between described high efficiency particulate air filter and end composite catalyst unit, cylindrical shell is separated at least two photocatalysis rooms in the cavity region between high efficiency particulate air filter and end composite catalyst unit, each photocatalysis indoor are provided with uviol lamp along cylindrical shell radial direction, described stage casing composite catalyst unit is arranged along cylindrical shell radial direction, described stage casing composite catalyst unit is that two-layer photocatalyst layer and one deck ozone catalytic oxidant layer are composited, wherein one deck ozone catalytic oxidant layer is positioned at centre, two-layer photocatalyst layer is positioned at both sides, the stage casing composite catalyst unit be compounded to form thus is sandwich three layers of catalyst layer.
6. the emission-control equipment of vacuum-ultraviolet light catalyzing cooperation catalytic ozonation according to claim 5, it is characterized in that: described stage casing composite catalyst unit is two, and cylindrical shell is separated into three photocatalysis rooms in the cavity region between high efficiency particulate air filter and end composite catalyst unit.
7. the emission-control equipment of vacuum-ultraviolet light catalyzing cooperation catalytic ozonation according to claim 5, is characterized in that: the ozone catalytic oxidant layer in described stage casing composite catalyst unit is thin layer ozone catalytic oxidant layer.
8. the emission-control equipment of the vacuum-ultraviolet light catalyzing cooperation catalytic ozonation according to any one of claim 2 to 7, is characterized in that: described uviol lamp is vacuum UV lamp or microwave electrodeless lamp, and wavelength is 185nm.
9. the emission-control equipment of the vacuum-ultraviolet light catalyzing cooperation catalytic ozonation according to any one of claim 2 to 7, is characterized in that: the photochemical catalyst in described photocatalyst layer is TiO
2; Described ozone catalytic oxidant layer is at molecular sieve, SiO
2or load has the catalyst layer of the single or composite transition metal oxide of Mn, Ni, Co, Cu on active aluminum oxide carrier.
10. the emission-control equipment of the vacuum-ultraviolet light catalyzing cooperation catalytic ozonation according to any one of claim 2 to 7, is characterized in that: described waste gas comprises organic exhaust gas, foul gas, SO
2, nitrogen oxide or organic exhaust gas, stench, SO
2, nitrogen oxide mist.
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