CN103949128B - A kind of method and device purifying the flue gas containing dust - Google Patents

A kind of method and device purifying the flue gas containing dust Download PDF

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CN103949128B
CN103949128B CN201410166067.2A CN201410166067A CN103949128B CN 103949128 B CN103949128 B CN 103949128B CN 201410166067 A CN201410166067 A CN 201410166067A CN 103949128 B CN103949128 B CN 103949128B
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storehouse
luminous energy
pretreatment
flue gas
dust
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CN103949128A (en
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傅国琳
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CHE DAOLAN
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CHE DAOLAN
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D50/00Combinations of devices for separating particles from gases or vapours
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/46Removing components of defined structure
    • B01D53/72Organic compounds not provided for in groups B01D53/48 - B01D53/70, e.g. hydrocarbons
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/74General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/74General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86Catalytic processes

Abstract

The invention discloses a kind of method and device purifying the flue gas containing dust, the method includes washing and oxidation/catalytic reaction process, and this device includes pretreatment storehouse and luminous energy storehouse.Pretreatment storehouse has the ability eliminating PM10, and luminous energy storehouse is the removal device of PM2.5.The present invention solves the removal problem of PM10 Yu PM2.5 in the case of not having any extra charge, is the method for removal particulate matter the most most economical, effective.

Description

A kind of method and device purifying the flue gas containing dust
(1) technical field:
The present invention relates to a kind of purification method and device, a kind of method purifying the flue gas containing dust and dress Put.
(2) background technology:
Healthy impact has been caused at present and has paid close attention to widely by PM2.5.What is particulate matter 2.5 (PM2.5)?He Refer to be combined in the small pieces of solid less than 2.5 microns of diameter in earth atmosphere or liquid substance.Particulate matter compositions can cause Significantly visual effect, such as flue dust, it is by sulfur dioxide, nitrogen oxides, carbon monoxide, Mineral Dusts, organic substance and element Carbon forms, also referred to as black carbon or coal smoke.Due to the existence of sulfur, granule is moisture absorption, and SO2Can be at high humility and low temperature Under be converted into sulphuric acid.This will cause the suction sense of visibility reduction, yellow air, ozone and twinge.The mankind suck micro-with animal The impact of grain material has been extensively studied;What PM2.5 caused health problem includes asthma, pulmonary carcinoma, cardiovascular problems, exhales Desorption system disease, birth defect and premature death.
Granular material discharged the most strictly supervised in most industry country.Due to environmental problem, most industries is all Need to carry out the operation of certain dust collecting system, granular material discharged to control.These systems include that (eddy flow removes centrifugal deduster Dirt device), fiber filter cleaner unit (sack cleaner), wet scrubber and electrostatic precipitator.But, cheap cleaner effect Rate is the lowest, is typically not capable of 80%;Good equipment such as electrostatic precipitation, although efficiency may be up to 99%, but also has it fatal scarce Point: (1) equipment is huge, consumption steel is many, needs high-voltage transforming and rectifying installation, therefore investment is high.(2) efficiency of dust collection is by dust specific resistance Restriction, the general contrast resistance dust less than 104~105 ohm every centimeter or more than 1010~1011 ohm every centimeter, if not Taking certain measure, efficiency of dust collection will be affected.(3) not possessing off-line maintenance function, once equipment breaks down, or band Sick operation, or can only shutdown maintenance.Sum it up, it is all the highest with maintenance cost that any effective percentage is built except the equipment of PM 's.
China also has been presented for the restriction (see table) to particulate in air discharge, and each factory and enterprise is the most all by regulation Cleaner.But huge maintenance expense makes medium-sized and small enterprises unable to make ends meet really.Therefore development one is inexpensive and effective It is the task of top priority that dedusting is put.
PM10 PM2.5
Every year 70 micrograms/cubic meter 35 micrograms/cubic meter
Daily (24 hours) 150 micrograms/cubic meter 75 micrograms/cubic meter
(3) summary of the invention:
It is an object of the invention to provide and a kind of purify the method and device of flue gas containing dust, of this system is Good function is the removal problem solving PM10 Yu PM2.5 in the case of not having any extra charge.Pretreatment storehouse has and disappears Except the ability of PM10, luminous energy storehouse is the removal device of PM2.5.High intensity UV lamp and Fenton's reaction can be with any organic and inorganic Molecule reacts and decomposes.The present invention can get rid of the dust produced in coal combustion exhaust, is the side of a kind of physical engagement chemistry Method, dust becomes carbon dioxide and water through washing, the reaction of oxidation/catalysis after decomposing.
Technical scheme: a kind of process contains the method for the flue gas of dust, it is characterised in that comprise the following steps:
(1) in pretreating containers, water is added;
(2) add in reaction vessel containing Fenton reagent and use Alpha-hydroxy acid for adjusting pH value to less than or equal to 3 molten Liquid, described Fenton reagent comprises metal system and the hydrogen peroxide that light can be occurred to help Fenton's reaction;
Described solution allocation hydrogen peroxide is 3%~5% with the mass percent of water;
Hydrogen peroxide and metal system mol ratio are more than or equal to 10:1;
(3) according to the optical absorption peak of metal system, reaction vessel arranges illumination system;
(4) waste gas being passed through pretreating containers, be fully contacted with liquid, the solid particle making diameter be more than 10 microns is stayed In liquid;
(5) liquid of the solid particle being more than 10 microns containing diameter is derived pretreating containers;
(6) flue gas after purifying discharges pretreating containers;
(7) flue gas that step (6) is discharged is passed through reaction vessel, is fully contacted reaction with Fenton reagent, makes in flue gas It is carbon dioxide that Hydrocarbon is decomposed into carbon dioxide and water, carbon granule and Oxidation of Carbon Monoxide;
(8) after reacting, solution is derived, and periodic monitor derives the concentration of Fenton reagent in solution, according to the feelings of monitoring Condition, adds the new solution containing Fenton reagent and makes solution composition keep stable;
(9) purified gas is discharged reaction vessel.
Step described above (1) adds step (1 ') for use nitric acid adjustment pH value afterwards to less than 3, is subsequently adding oxidation examination Agent, makes carbon granule be oxidized to carbon monoxide, and described oxidising agent is the mixture of hydrogen peroxide, molybdenum oxide and tungsten oxide, oxidation Magnesium and the mixture of magnesium hydroxide or iron sesquioxide, wherein, molybdenum oxide, tungsten oxide, magnesium oxide, magnesium hydroxide and three oxidations two The diameter of ferrum solid particle is less than 20nm, the volume ratio of hydrogen peroxide and water be 1:18~22, molybdenum oxide and tungsten oxide mole Being 1:1 than the mol ratio for 1:1, magnesium oxide and magnesium hydroxide, molybdenum oxide is more than or equal to 10mol/L, oxidation with the amount ratio of water Tungsten is more than or equal to 10mol/L, magnesium hydroxide and water more than or equal to 10mol/L, magnesium oxide with the amount ratio of water with the amount ratio of water Amount ratio more than or equal to 10mol/L, the amount ratio of iron sesquioxide and water is more than or equal to 20mol/L.
The concentration of the oxidising agent in step (1 ') described above needs periodic monitor and supplements oxidising agent as required Make oxidising agent concentration in solution stable.
Metal system in step described above (2) is Fe (II)/F (III) system or Cu (I)/Cu (II) system;Work as gold When genus system is Fe (II)/F (III) system, then illumination be wavelength be the ultraviolet light of 200nm~400nm;When metal system is Cu (I) during/Cu (II) system, illumination be wavelength be the visible ray of 600nm~800nm.
Fe described above (II)/F (III) system is less than the FeSO of 20 nanometers by diameter4And Fe3O4Granule is constituted.
Cu described above (I)/Cu (II) system is less than the Cu of 20 nanometers by diameter2O and CuSO4Granule is constituted.
The mode being fully contacted in step described above (4) for by liquid by spray equipment to gas shower, to increase Area that waste gas contacts with liquid and time.
Flue gas in step described above (4) from pretreating containers bottom enter, direction level and with chamber wall be 40~ 50 degree of angles, the time contacted with liquid with increase.
In step described above (5), the liquid of derivation pretreating containers is after removing the particulate matter more than 10 microns, by taking out Water pump returns in pretreating containers by pipeline is defeated.
Hydrogen peroxide described above is that diameter is less than the Magnesium dioxide of 50 nanometers, sodium peroxide or calper calcium peroxide described molten Liquid produces after reaction.
The consumption of hydrogen peroxide described above by close monitoring, and uses iodine/Gao Meng by periodic collection sample Acid potassium (I/KMnO4) titrimetry observes the consumption rate of peroxide.
'alpha '-hydroxy acids described above is glycolic, acetone acid or lactic acid.
The mode being fully contacted in step described above (7) for being passed directly into liquid or being filled by spray by liquid by gas Put at least one in gas shower.
A kind of device realizing method described above, including pretreatment storehouse and luminous energy storehouse;Described pretreatment storehouse includes pre-place Reason warehouse, pretreatment storehouse spray equipment, pretreatment storehouse air inlet, pretreatment storehouse suction pump, reservoir, pretreatment storehouse liquid outlet, Pretreatment storehouse inlet and gas outlet, pretreatment storehouse, the bottom of described pretreatment warehouse is reservoir, and pretreatment storehouse liquid outlet sets Putting at reservoir, described pretreatment storehouse air inlet, pretreatment storehouse inlet and gas outlet, pretreatment storehouse are arranged on reservoir On the pretreatment warehouse of side, gas outlet, pretreatment storehouse is above the air inlet of pretreatment storehouse, and described pretreatment storehouse spray equipment sets Putting in pretreatment warehouse, described pretreatment storehouse suction pump connects outfan and the pretreatment storehouse spray dress of reservoir by pipeline The input put;Described luminous energy storehouse includes luminous energy warehouse, luminous energy storehouse air inlet, gas outlet, luminous energy storehouse, luminous energy storehouse inlet, gas-liquid Hybrid channel, luminous energy storehouse suction pump, luminous energy storehouse liquid outlet, luminous energy storehouse spray equipment and light irradiation apparatus, described luminous energy storehouse air inlet With the top that gas outlet, luminous energy storehouse is arranged on luminous energy warehouse, described luminous energy storehouse inlet is arranged on the middle part of luminous energy warehouse, described Luminous energy storehouse liquid outlet is arranged on the bottom of luminous energy warehouse, described gas-liquid mixed passage, luminous energy storehouse spray equipment and light irradiation apparatus position In luminous energy warehouse, the input of gas-liquid mixed passage connects luminous energy storehouse air inlet, and the outfan of gas-liquid mixed passage is positioned at light Energy warehouse bottom is close to the position at the bottom of storehouse, and described luminous energy storehouse suction pump connects the outfan bottom luminous energy warehouse and light by pipeline The input of energy storehouse spray equipment;Gas outlet, described pretreatment storehouse connects luminous energy storehouse air inlet.
Pretreatment warehouse top described above arranges pretreatment storehouse access cover, and the sidewall of pretreatment warehouse arranges pretreatment Storehouse maintenance door, reservoir top arranges infundibulate collecting board, and the sidewall of reservoir arranges pretreatment storehouse liquid level meter and thief hatch.
Pretreatment storehouse described above spray equipment is the pressurized spray device being arranged on pretreatment warehouse inner top, or is The pressurized spray device being arranged on pretreatment warehouse inner top and the atomizing spray equipment being arranged on pretreatment warehouse inwall.
The spray droplet of pressurized spray device described above is uniform line;A diameter of 2~3 millimeters of each of the droplets, It is spaced 6~10 millimeters between every.
Pretreatment warehouse described above is made up of stainless steel metal plate.
Pretreatment storehouse described above suction pump is acidproof water pump.
Luminous energy warehouse described above is made up of stainless steel metal plate, and luminous energy warehouse inwall scribbles corrosion-inhibiting coating.
Arranging luminous energy storehouse liquid level meter on the sidewall of luminous energy warehouse described above, luminous energy warehouse top arranges the maintenance of luminous energy storehouse Lid.
Light irradiation apparatus described above is quartz ampoule uviol lamp or visible lamp.
The operation principle of the present invention:
1, the operation principle in pretreatment storehouse:
Liquid in pretreatment storehouse is controlled circulation by an acidproof water pump, and liquid is contained within water and oxidising agent, and water can To remove the PM10 in flue gas.Oxidising agent uses hydrogen peroxide (H2O2) time, H2O2Be equivalent to strong under acid reaction environment Oxidant.Flue gas is in the speed of ventilation shaft more than 6 meter per seconds, and with this kind of speed, any material entrained by flue gas is the most too many Time go produce chemical reaction, unless this reaction be heat release with spontaneous.Additionally, relative to other strong oxidizers, peroxide Change that hydrogen is relatively cheap and safety, thus cost can be greatly reduced when this technology is applied to industry on a large scale and carry High safety precaution coefficient.
If peroxide is in gaseous state, then although gas reaction has higher reaction power and generally sends out Raw very fast, but its back reaction also can produce immediately after equilibration had been achieved.Oxide produced by peroxide broadly falls into Transition state, they are not highly stable.Without effective way, transition state changed into other end product, this intermediate Reactant can be converted back at once and therefore decrease effect of oxidant.Therefore, by luminous energy storehouse behind pretreatment storehouse Face, successfully and effectively solves this problem.
The top in pretreatment storehouse and side placed spray system to guarantee to have between flue gas and liquid the most for a long time Contact.Flue gas will enter pretreatment storehouse with 40-50 degree angle, cause flue gas to produce helical effect when moving up.Spray system All can promote flue gas with helical effect and rest on the time within pretreatment storehouse.The uniform line of drop of top shower, it is ensured that In the case of gas extraction system not being produced any back-pressure, the maximum contact between flue gas and liquid.Any liquid being less than 2 millimeters Drip and can be easy to be brought into luminous energy storehouse by aerofluxus strength.Cross-contamination can reduce the efficiency of equipment, it is therefore desirable to avoids.Side shower System is atomizing to guarantee being sufficiently mixed of liquid and gas.
2, the operation principle in luminous energy storehouse:
In luminous energy storehouse, help Fenton's reaction and catalysis/oxidation reaction that dust is changed into carbon dioxide by making to use up. Fenton's reaction is the reaction of a simple photosensitized oxidation/reduction catalysts, being mainly characterized by it and produce active oxygen of Fenton's reaction (ROS), particularly hydroxyl radical free radical.Hydroxyl radical free radical is maximally effective active oxygen, and it can aoxidize has any of its periphery Machine (including biomolecule) and inorganic matrix.Its original chemical reaction is Fe (II) and H2O2Reaction generates Fe (III) and OH (see Fig. 4), reduction Fe (III) to Fe (II) needs heat or the energy of light.There is no substrate and substrate and having the situation of luminous energy Under, there are three dominant mechanisms (see Fig. 5-7).Light helps the efficiency of Fenton's reaction to depend primarily on H2O2Concentration, Fe (II)/H2O2 Ratio, pH value, the intensity of response time and UV light.The chemical characteristic of pollutant, physical characteristic, initial concentration and temperature, Also final efficiency had important impact.
Dust (main component of haze) in flue gas burns incomplete coal the most exactly, and the organic substance contained in coal exists Producing imflammable gas after decomposes, also referred to as " volatile matter " (VOC), it is by various Hydrocarbon, hydrogen, an oxygen Change the mixed gas of the compound compositions such as carbon.When the burning of coal combustion condition is not marked or volatile matter is high coal (colm) easy Produce the carbon granules that uncombusted is little, be commonly called as " black smoke ";And produce the carbon such as more VOC such as carbon monoxide, multiring aromatic hydrocarbon, aldehydes Pollutant are closed in hydrogenation.
Any organic carbon-containing molecule being present in flue gas can be oxidized to CO when it is through luminous energy storehouse2, heavy metal and Inorganic mineral then can be deposited in the fiber removal of mercury filter in our discharge duct.Hydroxyl radical free radical and cigarette in luminous energy storehouse First reaction of Hydrocarbon in gas is to remove a hydrogen atom in its molecular structure (R), then forms water and alkyl Free radical (R) (see Fig. 8), second reaction is that alkyl diradical (R) reacts rapidly formation peroxide freely again with molecular oxygen Base (see Fig. 9), the most again through many steps, ultimately generates carbon dioxide and water.
The superiority of the present invention: 1, the advantage of nano material is that its surface area is big, and between molecule, electronic shell transfers mutually Very fast, can make to accelerate as chemical reaction velocity index;Especially in optical field, the work of the least luminous energy of diameter of nanometer Property is the biggest with momentum.So wanting that the flue gas making flow velocity the fastest produces any chemical reaction, the advantage of nanotechnology is could not Fixed.The redox reaction of self is spontaneous, has the characteristic of catalyst, so without often attaching, consumption is few, very Economy.2, the present invention sets up and helps in the principle of Fenton's reaction at light, and achieves immense success eliminating on flue dust.The present invention Being the method for removal particulate matter the most most economical, effective, this is that one more economical, more efficient way is dirty to control air Dye, it is not necessary to any extra manufacture and operating cost.It can be included into the existing dust pelletizing system of coal-burning boiler for improving Its effectiveness, it is also possible to replace original old system completely.The most applicable industrial market at other of this filtration system, including water Mud factory, steel plant, trash burning factory of municipal government, clinical waste combustion plant, chlorine maker, paper pulp and paper production factory etc..
This device dust removing effects detection test report is as follows:
1, the present invention is for purifying the test report of vehicle exhaust:
2, the present invention is for the test report (test site is certain boiler room) of purification boiler waste gas:
Remarks: standard value is according to " thermoelectricity field atmosphere pollutants emission standards " (GB13223-2011)
(4) accompanying drawing explanation:
Fig. 1 is a kind of involved by present invention process containing the pretreatment storehouse having two kinds of spray equipments in the device of the flue gas of dust Structural representation.
Fig. 2 is a kind of involved by present invention process containing pressurized spray device pre-having top in the device of the flue gas of dust Process the structural representation in storehouse.
Fig. 3 is a kind of involved by present invention process containing the structural representation in luminous energy storehouse in the device of the flue gas of dust.
Fig. 4 is that involved by the present invention, a kind of process helps Fe in Fenton's reaction (II) to aoxidize containing light in the method for the flue gas of dust Reaction equation for Fe (III).
Fig. 5 is that involved by the present invention, a kind of process helps the first Fe in Fenton's reaction containing light in the method for the flue gas of dust (III) reaction equation of Fe (II) it is reduced to.
Fig. 6 is that involved by the present invention, a kind of process helps the second Fe in Fenton's reaction containing light in the method for the flue gas of dust (III) reaction equation of Fe (II) it is reduced to.
Fig. 7 is that involved by the present invention, a kind of process helps the third Fe in Fenton's reaction containing light in the method for the flue gas of dust (III) reaction equation of Fe (II) it is reduced to.
Fig. 8 is that involved by the present invention, a kind of process helps hydroxyl radical free radical in Fenton's reaction containing light in the method for the flue gas of dust Water and the chemical equation of alkyl diradical is formed with hydrocarbon reaction.
Fig. 9 is that involved by the present invention, a kind of process helps alkyl diradical in Fenton's reaction containing light in the method for the flue gas of dust The chemical equation forming peroxy radical is reacted with molecular oxygen.
Figure 10 is a kind of involved by present invention process containing C in the method for the flue gas of dust2H6It is broken down into carbon dioxide and water Chemical equation.
Wherein, 1-1 is pretreatment storehouse access cover, and 1-2 is pretreatment storehouse spray equipment, and 1-3 is infundibulate collecting board, 1-4 For pretreatment storehouse air inlet, 1-5 is thief hatch, and 1-6 is pretreatment storehouse suction pump, and 1-7 is reservoir, and 1-8 is that pretreatment storehouse goes out Liquid mouth, 1-9 is pretreatment storehouse liquid level meter, and 1-10 is pretreatment storehouse inlet, and 1-11 is that door is overhauled in pretreatment storehouse, and 1-12 is pre-place Li Cang gas outlet, 1-13 is pretreatment warehouse, and 2-1 is gas outlet, luminous energy storehouse, and 2-2 is luminous energy storehouse air inlet, and 2-3 is that luminous energy storehouse is entered Liquid mouth, 2-4 is gas-liquid mixed passage, and 2-5 is luminous energy storehouse suction pump, and 2-6 is luminous energy storehouse liquid outlet, and 2-7 is luminous energy storehouse liquid level meter, 2-8 is luminous energy storehouse spray equipment, and 2-9 is luminous energy storehouse access cover, 2-10 light irradiation apparatus, and 2-11 is luminous energy warehouse.
(5) detailed description of the invention:
Embodiment 1: a kind of method processing the flue gas containing dust, it is characterised in that comprise the following steps:
(1) in pretreating containers, water is added;
(2) add in reaction vessel containing Fenton reagent and use Alpha-hydroxy acid for adjusting pH value to less than or equal to 3 molten Liquid, described Fenton reagent comprises metal system and the hydrogen peroxide that light can be occurred to help Fenton's reaction;
Described solution allocation hydrogen peroxide is 5% with the mass percent of water;
Hydrogen peroxide and metal system mol ratio are about 30:1;
(3) according to the optical absorption peak of metal system, reaction vessel arranges illumination system;
(4) waste gas being passed through pretreating containers, be fully contacted with liquid, the solid particle making diameter be more than 10 microns is stayed In liquid;
(5) liquid of the solid particle being more than 10 microns containing diameter is derived pretreating containers;
(6) flue gas after purifying discharges pretreating containers;
(7) flue gas that step (6) is discharged is passed through reaction vessel, is fully contacted reaction with Fenton reagent, makes in flue gas It is carbon dioxide that Hydrocarbon is decomposed into carbon dioxide and water, carbon granule and Oxidation of Carbon Monoxide;
(8) after reacting, solution is derived, and periodic monitor derives the concentration of Fenton reagent in solution, according to the feelings of monitoring Condition, adds the new solution containing Fenton reagent and makes solution composition keep stable;
(9) purified gas is discharged reaction vessel.
Step described above (1) adds step (1 ') for use nitric acid adjustment pH value afterwards to less than 3, is subsequently adding oxidation examination Agent, makes carbon granule be oxidized to carbon monoxide, and described oxidising agent is hydrogen peroxide, and hydrogen peroxide is 1:20 with the volume ratio of water.
The concentration of the oxidising agent in step (1 ') described above needs monitoring in every 10 hours and supplements oxidation as required Reagent makes oxidising agent concentration in solution stable.
Metal system in step described above (2) is Fe (II)/F (III) system;When metal system is Fe (II)/F (III) during system, then illumination be wavelength be the ultraviolet light of 200nm~400nm.
Fe described above (II)/F (III) system is less than the FeSO of 20 nanometers by diameter4And Fe3O4Granule is constituted.
The mode being fully contacted in step described above (4) for by liquid by spray equipment to gas shower, to increase Area that waste gas contacts with liquid and time.
Flue gas in step described above (4) enters from pretreating containers bottom, direction level be 45 degree with chamber wall Angle, the time contacted with liquid with increase.
In step described above (5), the liquid of derivation pretreating containers is after removing the particulate matter more than 10 microns, by taking out Water pump returns in pretreating containers by pipeline is defeated.
The consumption of hydrogen peroxide described above by every 10 hours collect sample by close monitoring, and use iodine/ Potassium permanganate (I/KMnO4) titrimetry observes the consumption rate of peroxide.
'alpha '-hydroxy acids described above is lactic acid.
The mode being fully contacted in step described above (7) for being passed directly into liquid and being filled by spray by liquid by gas Put to gas shower.
A kind of device realizing method described above, including pretreatment storehouse and luminous energy storehouse;Described pretreatment storehouse includes pre-place Reason warehouse 1-13, pretreatment storehouse spray equipment 1-2, pretreatment storehouse air inlet 1-4, pretreatment storehouse suction pump 1-6, reservoir 1-7, Pretreatment storehouse liquid outlet 1-8, pretreatment storehouse inlet 1-10 and pretreatment storehouse gas outlet 1-12, described pretreatment warehouse 1-13's Bottom is reservoir 1-7, and pretreatment storehouse liquid outlet 1-8 is arranged at reservoir 1-7, described pretreatment storehouse air inlet 1-4, locates in advance Reason storehouse inlet 1-10 and pretreatment storehouse gas outlet 1-12 is arranged on the pretreatment warehouse 1-13 above reservoir 1-7, locates in advance Li Cang gas outlet 1-12 is above the air inlet 1-4 of pretreatment storehouse, and described pretreatment storehouse spray equipment 1-2 is arranged on pretreatment storehouse In body 1-13, described pretreatment storehouse suction pump 1-6 connects outfan and the pretreatment storehouse spray equipment of reservoir 1-7 by pipeline The input of 1-2;Described luminous energy storehouse includes luminous energy warehouse 2-11, luminous energy storehouse air inlet 2-2, luminous energy storehouse gas outlet 2-1, luminous energy storehouse Inlet 2-3, gas-liquid mixed passage 2-4, luminous energy storehouse suction pump 2-5, luminous energy storehouse liquid outlet 2-6, luminous energy storehouse spray equipment 2-8 and Light irradiation apparatus 2-10, described luminous energy storehouse air inlet 2-2 and luminous energy storehouse gas outlet 2-1 are arranged on the top of luminous energy warehouse 2-11, institute Stating luminous energy storehouse inlet 2-3 and be arranged on the middle part of luminous energy warehouse 2-11, described luminous energy storehouse liquid outlet 2-6 is arranged on luminous energy warehouse 2- The bottom of 11, described gas-liquid mixed passage 2-4, luminous energy storehouse spray equipment 2-8 and light irradiation apparatus 2-10 are positioned at luminous energy warehouse 2-11 In, the input of gas-liquid mixed passage 2-4 connects luminous energy storehouse air inlet 2-2, and the outfan of gas-liquid mixed passage 2-4 is positioned at luminous energy Warehouse 2-11 bottom is close to the position at the bottom of storehouse, and described luminous energy storehouse suction pump 2-5 is connected bottom luminous energy warehouse 2-11 by pipeline Outfan and the input of luminous energy storehouse spray equipment 2-8;Described pretreatment storehouse gas outlet 1-12 connects luminous energy storehouse air inlet 2-2.
Pretreatment warehouse 1-13 top described above arranges pretreatment storehouse access cover 1-1, the sidewall of pretreatment warehouse 1-13 On arrange pretreatment storehouse maintenance door 1-11, reservoir 1-7 top infundibulate collecting board 1-3 is set, the sidewall of reservoir 1-7 sets Put pretreatment storehouse liquid level meter 1-9 and thief hatch 1-5.
Pretreatment storehouse spray equipment 1-2 described above is the pressurized spray device being arranged on pretreatment warehouse 1-13 inner top With the atomizing spray equipment being arranged on pretreatment warehouse 1-13 inwall.(see Fig. 1)
The spray droplet of pressurized spray device described above is uniform line;A diameter of 2~3 millimeters of each of the droplets, It is spaced 8 millimeters between every.
Pretreatment warehouse 1-13 described above is made up of stainless steel metal plate.
Pretreatment storehouse suction pump 1-6 described above is acidproof water pump.
Luminous energy warehouse 2-11 described above is made up of stainless steel metal plate, and luminous energy warehouse 2-11 inwall scribbles 2-3mm ferrum Fluorine dragon (Teflon) corrosion-inhibiting coating.
Arrange luminous energy storehouse liquid level meter 2-7, luminous energy warehouse 2-11 top on the sidewall of luminous energy warehouse 2-11 described above to arrange Luminous energy storehouse access cover 2-9.
Light irradiation apparatus 2-10 described above is quartz ampoule uviol lamp.
The method of work of dust arrester in the present embodiment:
As a example by 15 tons of coal-burning boilers for about 30 tons of coals of burning every day:
The method of work in pretreatment storehouse:
(1) diameter of pretreatment warehouse 1-13 and height are respectively 2.7 meters and 3 meters;
(2) inject the water of 40 centimetres of water levels, constitute 2289 liters of water, use nitric acid adjustment pH value to less than 3, be subsequently adding 35% hydrogen peroxide of 327 liters;
(3) open pretreatment storehouse suction pump 1-6, pretreatment storehouse spray equipment 1-2 to start working;
(4) flue gas enters from the direction of pretreatment storehouse air inlet 1-4 with pretreatment warehouse 1-13 inwall angle 45 degree In pretreatment warehouse 1-13, flue gas is made to produce helical effect when moving up;
(5) in flue gas, the diameter solid particle more than 10 microns stays in a liquid;
(6) liquid of the solid particle being more than 10 microns containing diameter is derived from pretreatment storehouse liquid outlet 1-8;
(7) flue gas after purifying is discharged from pretreatment storehouse gas outlet 1-12;
(8) hydrogen peroxide (H2O2) consumption by the sample collection of every 10 hours by close monitoring, and use Iodine/potassium permanganate (I/KMnO4) titrimetry observe peroxide consumption rate.
The method of work in luminous energy storehouse:
(1) diameter of luminous energy warehouse 2-11 and height are respectively 2.7 meters and 2.25 meters;
(2) inject the water of 5725 liters to luminous energy warehouse 2-11, add the 35%H of 817 liters2O2With the FeSO of 64 kilograms4 (FeSO4:H2O2=1:5w/w);
(3) arrange 4 1000W widebands in luminous energy warehouse 2-11, wavelength is 200nm to 400nm, optical absorption peak value is equal to UV light (the FeSO of 365nm4At 365nm, there is the highest absorptance);
(4) luminous energy storehouse spray equipment 2-8 is opened;
(5) flue gas that pretreatment storehouse gas outlet 1-12 discharges is passed through luminous energy warehouse 2-11 from luminous energy storehouse air inlet 2-2, With liquid haptoreaction at gas-liquid mixed passage 2-4, after gas emersion liquid level, the liquid sprayed with luminous energy storehouse spray equipment 2-8 again Dripping haptoreaction, making the Hydrocarbon in flue gas be decomposed into carbon dioxide and water, carbon granule and Oxidation of Carbon Monoxide is dioxy Changing carbon, wherein, Hydrocarbon common in flue gas includes C2H6(see Figure 10) can be decomposed in luminous energy storehouse;
(6) after reacting, solution is derived from luminous energy storehouse liquid outlet 2-6, hydrogen peroxide (H2O2) consumption by every 10 little Time sample collection by close monitoring, and use iodine/potassium permanganate (I/KMnO4) titrimetry observe peroxide consumption Rate, according to the CO in flue gas2Content, dosing pump will supplement hydrogen peroxide to luminous energy warehouse 2-11 from receiver;
(7) purified gas is discharged luminous energy warehouse 2-11 from luminous energy storehouse gas outlet 2-1.
From the point of view of industrial test data according to described in the present embodiment 15 tons of coal-burning boilers, the method for the invention has reached The PM2.5 clearance of 95.4% (from 105 micrograms/cubic meter to 5 micrograms/cubic meter).
Embodiment 2:
A kind of method processing the flue gas containing dust, it is characterised in that comprise the following steps:
(1) in pretreating containers, water is added;
(2) add in reaction vessel containing Fenton reagent and use Alpha-hydroxy acid for adjusting pH value to less than or equal to 3 molten Liquid, described Fenton reagent comprises metal system and the hydrogen peroxide that light can be occurred to help Fenton's reaction;
Described solution allocation hydrogen peroxide is 4% with the mass percent of water;
Hydrogen peroxide and metal system mol ratio are 10:1;
(3) according to the optical absorption peak of metal system, reaction vessel arranges illumination system;
(4) waste gas being passed through pretreating containers, be fully contacted with liquid, the solid particle making diameter be more than 10 microns is stayed In liquid;
(5) liquid of the solid particle being more than 10 microns containing diameter is derived pretreating containers;
(6) flue gas after purifying discharges pretreating containers;
(7) flue gas that step (6) is discharged is passed through reaction vessel, is fully contacted reaction with Fenton reagent, makes in flue gas It is carbon dioxide that Hydrocarbon is decomposed into carbon dioxide and water, carbon granule and Oxidation of Carbon Monoxide;
(8) after reacting, solution is derived, and periodic monitor derives the concentration of Fenton reagent in solution, according to the feelings of monitoring Condition, adds the new solution containing Fenton reagent and makes solution composition keep stable;
(9) purified gas is discharged reaction vessel.
Step described above (1) adds step (1 ') for use nitric acid adjustment pH value afterwards to less than 3, is subsequently adding oxidation examination Agent, makes carbon granule be oxidized to carbon monoxide, and described oxidising agent is the mixture of molybdenum oxide and tungsten oxide, molybdenum oxide and tungsten oxide The diameter of solid particle is less than 20nm, and the mol ratio of molybdenum oxide and tungsten oxide is 1:1, and molybdenum oxide is 10mol/ with the amount ratio of water L, tungsten oxide is 10mol/L with the amount ratio of water.
The concentration of the oxidising agent in step (1 ') described above needs periodic monitor and supplements oxidising agent as required Make oxidising agent concentration in solution stable.
Metal system in step described above (2) is Cu (I)/Cu (II) system, illumination be wavelength be 600nm~ The visible ray of 800nm.
Cu described above (I)/Cu (II) system is less than the Cu of 20 nanometers by diameter2O and CuSO4Granule is constituted.
The mode being fully contacted in step described above (4) for by liquid by spray equipment to gas shower, to increase Area that waste gas contacts with liquid and time.
Flue gas in step described above (4) enters from pretreating containers bottom, direction level be 45 degree with chamber wall Angle, the time contacted with liquid with increase.
In step described above (5), the liquid of derivation pretreating containers is after removing the particulate matter more than 10 microns, by taking out Water pump returns in pretreating containers by pipeline is defeated.
Hydrogen peroxide described above is that diameter is less than in solution described in the Magnesium dioxide of 50 nanometers and produces after reaction.
The consumption of hydrogen peroxide described above, by collecting sample for every eight hours by close monitoring, and uses iodine/height Potassium manganate (I/KMnO4) titrimetry observes the consumption rate of peroxide.
'alpha '-hydroxy acids described above is glycolic.
The mode being fully contacted in step described above (7) for being passed directly into liquid and being filled by spray by liquid by gas Put to gas shower.
A kind of dust arrester realizing method described above, including pretreatment storehouse and luminous energy storehouse;Described pretreatment storehouse includes Pretreatment warehouse 1-13, pretreatment storehouse spray equipment 1-2, pretreatment storehouse air inlet 1-4, pretreatment storehouse suction pump 1-6, reservoir 1-7, pretreatment storehouse liquid outlet 1-8, pretreatment storehouse inlet 1-10 and pretreatment storehouse gas outlet 1-12, described pretreatment warehouse 1- The bottom of 13 is reservoir 1-7, and pretreatment storehouse liquid outlet 1-8 is arranged at reservoir 1-7, described pretreatment storehouse air inlet 1-4, Pretreatment storehouse inlet 1-10 and pretreatment storehouse gas outlet 1-12 is arranged on the pretreatment warehouse 1-13 above reservoir 1-7, Pretreatment storehouse gas outlet 1-12 is above the air inlet 1-4 of pretreatment storehouse, and described pretreatment storehouse spray equipment 1-2 is arranged on pre-place In reason warehouse 1-13, described pretreatment storehouse suction pump 1-6 connects outfan and the pretreatment storehouse spray of reservoir 1-7 by pipeline The input of device 1-2;Described luminous energy storehouse includes luminous energy warehouse 2-11, luminous energy storehouse air inlet 2-2, luminous energy storehouse gas outlet 2-1, light Can storehouse inlet 2-3, gas-liquid mixed passage 2-4, luminous energy storehouse suction pump 2-5, luminous energy storehouse liquid outlet 2-6, luminous energy storehouse spray equipment 2-8 and light irradiation apparatus 2-10, described luminous energy storehouse air inlet 2-2 and luminous energy storehouse gas outlet 2-1 are arranged on the upper of luminous energy warehouse 2-11 Portion, described luminous energy storehouse inlet 2-3 is arranged on the middle part of luminous energy warehouse 2-11, and described luminous energy storehouse liquid outlet 2-6 is arranged on luminous energy The bottom of warehouse 2-11, described gas-liquid mixed passage 2-4, luminous energy storehouse spray equipment 2-8 and light irradiation apparatus 2-10 are positioned at luminous energy storehouse In body 2-11, the input of gas-liquid mixed passage 2-4 connects luminous energy storehouse air inlet 2-2, the outfan position of gas-liquid mixed passage 2-4 In luminous energy warehouse 2-11 bottom close to the position at the bottom of storehouse, described luminous energy storehouse suction pump 2-5 connects luminous energy warehouse 2-11 by pipeline The outfan of bottom and the input of luminous energy storehouse spray equipment 2-8;Described pretreatment storehouse gas outlet 1-12 connects the air inlet of luminous energy storehouse Mouth 2-2.
Pretreatment warehouse 1-13 top described above arranges pretreatment storehouse access cover 1-1, the sidewall of pretreatment warehouse 1-13 On arrange pretreatment storehouse maintenance door 1-11, reservoir 1-7 top infundibulate collecting board 1-3 is set, the sidewall of reservoir 1-7 sets Put pretreatment storehouse liquid level meter 1-9 and thief hatch 1-5.
Pretreatment storehouse spray equipment 1-2 described above is the pressurized spray dress being arranged on pretreatment warehouse 1-13 inner top Put.(see Fig. 2)
The spray droplet of pressurized spray device described above is uniform line;A diameter of 2~3 millimeters of each of the droplets, It is spaced 8 millimeters between every.
Pretreatment warehouse 1-13 described above is made up of stainless steel metal plate.
Pretreatment storehouse suction pump 1-6 described above is acidproof water pump.
Luminous energy warehouse 2-11 described above is made up of stainless steel metal plate, and luminous energy warehouse 2-11 inwall scribbles 2-3mm ferrum Fluorine dragon (Teflon) corrosion-inhibiting coating.
Arrange luminous energy storehouse liquid level meter 2-7, luminous energy warehouse 2-11 top on the sidewall of luminous energy warehouse 2-11 described above to arrange Luminous energy storehouse access cover 2-9.
Light irradiation apparatus 2-10 described above is visible lamp.
In the present embodiment, one of advantage using Cu (I)/Cu (II) system is Cu2The optical absorption peak value of O at 600nm, CuSO4Optical absorption peak value at 700nm, be all in the least visible region (600-800nm, near-infrared) of harm.

Claims (21)

1. the device processing the flue gas containing dust, it is characterised in that include pretreatment storehouse and luminous energy storehouse;Described pretreatment Storehouse includes pretreatment warehouse, pretreatment storehouse spray equipment, pretreatment storehouse air inlet, pretreatment storehouse suction pump, reservoir, pretreatment Storehouse liquid outlet, pretreatment storehouse inlet and gas outlet, pretreatment storehouse, the bottom of described pretreatment warehouse is reservoir, pretreatment storehouse Liquid outlet is arranged at reservoir, and described pretreatment storehouse air inlet, pretreatment storehouse inlet and gas outlet, pretreatment storehouse are arranged on On pretreatment warehouse above reservoir, gas outlet, pretreatment storehouse is above the air inlet of pretreatment storehouse, and described pretreatment storehouse is sprayed Shower device is arranged in pretreatment warehouse, and described pretreatment storehouse suction pump connects outfan and the pretreatment of reservoir by pipeline The input of storehouse spray equipment;Described luminous energy storehouse includes that luminous energy warehouse, luminous energy storehouse air inlet, gas outlet, luminous energy storehouse, luminous energy storehouse are entered Liquid mouth, gas-liquid mixed passage, luminous energy storehouse suction pump, luminous energy storehouse liquid outlet, luminous energy storehouse spray equipment and light irradiation apparatus, described luminous energy Storehouse air inlet and gas outlet, luminous energy storehouse are arranged on the top of luminous energy warehouse, and described luminous energy storehouse inlet is arranged in luminous energy warehouse Portion, described luminous energy storehouse liquid outlet is arranged on the bottom of luminous energy warehouse, described gas-liquid mixed passage, luminous energy storehouse spray equipment and illumination Equipment is positioned at luminous energy warehouse, and the input of gas-liquid mixed passage connects luminous energy storehouse air inlet, the outfan of gas-liquid mixed passage Being positioned at luminous energy warehouse bottom close to the position at the bottom of storehouse, described luminous energy storehouse suction pump connects the output bottom luminous energy warehouse by pipeline End and the input of luminous energy storehouse spray equipment;Gas outlet, described pretreatment storehouse connects luminous energy storehouse air inlet.
A kind of device processing the flue gas containing dust the most according to claim 1, it is characterised in that described pretreatment storehouse Body top arranges pretreatment storehouse access cover, and the sidewall of pretreatment warehouse arranges pretreatment storehouse maintenance door, and reservoir top is arranged Infundibulate collecting board, the sidewall of reservoir arranges pretreatment storehouse liquid level meter and thief hatch.
A kind of device processing the flue gas containing dust the most according to claim 1, it is characterised in that described pretreatment storehouse Spray equipment is the pressurized spray device being arranged on pretreatment warehouse inner top, or for be arranged on pretreatment warehouse inner top Pressurized spray device and the atomizing spray equipment being arranged on pretreatment warehouse inwall.
A kind of device processing the flue gas containing dust the most according to claim 3, it is characterised in that described pressurized spray The spray droplet of device is uniform line;A diameter of 2~3 millimeters of each of the droplets, are spaced 6~10 millimeters between every.
A kind of device processing the flue gas containing dust the most according to claim 1, it is characterised in that described pretreatment storehouse Body is made up of stainless steel metal plate.
A kind of device processing the flue gas containing dust the most according to claim 1, it is characterised in that described pretreatment storehouse Suction pump is acidproof water pump.
A kind of device processing the flue gas containing dust the most according to claim 1, it is characterised in that described luminous energy warehouse It is made up of stainless steel metal plate, luminous energy warehouse inwall scribbles corrosion-inhibiting coating.
A kind of device processing the flue gas containing dust the most according to claim 1, it is characterised in that described luminous energy warehouse Sidewall on luminous energy storehouse liquid level meter is set, luminous energy warehouse top arranges luminous energy storehouse access cover.
A kind of device processing the flue gas containing dust the most according to claim 1, it is characterised in that described light irradiation apparatus For quartz ampoule uviol lamp or visible lamp.
A kind of device processing the flue gas containing dust the most according to claim 1, it is characterised in that the use of this device Method comprises the following steps:
(1) in pretreatment storehouse, water is added;
(2) add in luminous energy storehouse containing Fenton reagent and use the Alpha-hydroxy acid for adjusting pH value solution extremely less than or equal to 3, described Fenton reagent comprises metal system and the hydrogen peroxide that light can be occurred to help Fenton's reaction;
Described solution allocation hydrogen peroxide is 3%~5% with the mass percent of water;
Hydrogen peroxide and metal system mol ratio are more than or equal to 10:1;
(3) according to the optical absorption peak of metal system, light irradiation apparatus is set in luminous energy storehouse;
(4) waste gas being passed through pretreatment storehouse, be fully contacted with liquid, the solid particle making diameter be more than 10 microns stays liquid In;
(5) liquid of the solid particle being more than 10 microns containing diameter is derived pretreatment storehouse;
(6) flue gas after purifying discharges pretreatment storehouse;
(7) flue gas that step (6) is discharged is passed through luminous energy storehouse, is fully contacted reaction with Fenton reagent, makes hydrocarbonization in flue gas It is carbon dioxide that compound is decomposed into carbon dioxide and water, carbon granule and Oxidation of Carbon Monoxide;
(8) after reacting, solution is derived, and periodic monitor derives the concentration of Fenton reagent in solution, according to the situation of monitoring, adds Adding the new solution containing Fenton reagent makes solution composition keep stable;
(9) purified gas is discharged luminous energy storehouse.
11. a kind of devices processing the flue gas containing dust, it is characterised in that after described step (1) Add step (1 ') for use nitric acid adjustment pH value to less than 3, be subsequently adding oxidising agent, make carbon granule be oxidized to an oxidation Carbon, described oxidising agent is the mixture or three of the mixture of hydrogen peroxide, molybdenum oxide and tungsten oxide, magnesium oxide and magnesium hydroxide Aoxidizing two ferrum, wherein, the diameter of molybdenum oxide, tungsten oxide, magnesium oxide, magnesium hydroxide and iron sesquioxide solid particle is less than 20nm, hydrogen peroxide is 1:1, magnesium oxide and hydrogen-oxygen with the mol ratio that volume ratio is 1:18~22, molybdenum oxide and tungsten oxide of water The mol ratio changing magnesium is 1:1, and molybdenum oxide is more than with the amount ratio of water more than or equal to 10mol/L, tungsten oxide with the amount ratio of water In 10mol/L, magnesium oxide is more than or equal to 10mol/L with the amount ratio of water, and magnesium hydroxide is more than or equal to the amount ratio of water 10mol/L, iron sesquioxide is more than or equal to 20mol/L with the amount ratio of water.
12. according to the device processing the flue gas containing dust a kind of described in claim 11, it is characterised in that described step (1 ') In the concentration of oxidising agent need periodic monitor and supplement oxidising agent as required and make oxidising agent concentration in solution stable.
13. a kind of devices processing the flue gas containing dust, it is characterised in that in described step (2) Metal system be Fe (II)/Fe (III) system or Cu (I)/Cu (II) system;When metal system is that Fe (II)/Fe (III) is During system, then illumination be wavelength be the ultraviolet light of 200nm~400nm;When metal system is Cu (I)/Cu (II) system, illumination is Wavelength is the visible ray of 600nm~800nm, and described Cu (I)/Cu (II) system is less than the Cu of 20 nanometers by diameter2O and CuSO4? Grain is constituted.
14. according to the device processing the flue gas containing dust a kind of described in claim 13, it is characterised in that described Fe (II)/Fe (III) system is less than the FeSO of 20 nanometers by diameter4And Fe3O4Granule is constituted.
15. a kind of devices processing the flue gas containing dust, it is characterised in that in described step (4) The mode being fully contacted for by liquid by spray equipment to gas shower, with increase area that waste gas contacts with liquid and time Between.
16. a kind of devices processing the flue gas containing dust, it is characterised in that in described step (4) Flue gas enter from bottom, pretreatment storehouse, direction level be 40~50 degree angles with chamber wall, with increase contact with liquid time Between.
17. a kind of devices processing the flue gas containing dust, it is characterised in that described step (5) In, the liquid in derivation pretreatment storehouse, after removing the particulate matter more than 10 microns, is returned to pretreatment by suction pump by pipeline is defeated In storehouse.
18. according to the device processing the flue gas containing dust a kind of described in claim 10 or 11, it is characterised in that described peroxide Changing hydrogen is that diameter is less than generation after the Magnesium dioxide of 50 nanometers, sodium peroxide or calper calcium peroxide react in described solution.
19. according to the device processing the flue gas containing dust a kind of described in claim 10 or 12, it is characterised in that described peroxide Change the consumption of hydrogen by periodic collection sample by close monitoring, and use iodine/potassium permanganate (I/KMnO4) titrimetry sight Examine the consumption rate of peroxide.
20. a kind of devices processing the flue gas containing dust, it is characterised in that described 'alpha '-hydroxy acids For glycolic, acetone acid or lactic acid.
21. a kind of devices processing the flue gas containing dust, it is characterised in that in described step (7) The mode being fully contacted is gas to be passed directly into liquid or by liquid by least one in gas shower of spray equipment.
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CN103949128B (en) * 2014-04-23 2016-08-17 林小晓 A kind of method and device purifying the flue gas containing dust
CN103949153B (en) * 2014-04-23 2017-01-04 林小晓 A kind of method and device utilizing light to help Fenton's reaction purifying smoke
CN105536481B (en) * 2016-01-22 2018-06-26 浙江工业大学 The ultraviolet Fenton oxidation organic waste gas treatment system of cyclic spraying and processing method

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CN103949128B (en) * 2014-04-23 2016-08-17 林小晓 A kind of method and device purifying the flue gas containing dust
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CN103949153B (en) * 2014-04-23 2017-01-04 林小晓 A kind of method and device utilizing light to help Fenton's reaction purifying smoke
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