CN103638761B - A kind of method of low temperature plasma coupling and catalyzing oxidation removal foul gas and device thereof - Google Patents
A kind of method of low temperature plasma coupling and catalyzing oxidation removal foul gas and device thereof Download PDFInfo
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- CN103638761B CN103638761B CN201310614024.1A CN201310614024A CN103638761B CN 103638761 B CN103638761 B CN 103638761B CN 201310614024 A CN201310614024 A CN 201310614024A CN 103638761 B CN103638761 B CN 103638761B
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Abstract
The invention discloses a kind of method and device of low temperature plasma coupling and catalyzing oxidation removal foul gas, described foul gas enters air after level Four purification.Described device comprises filler purifying column, reaction of low temperature plasma device, catalyst oxidation reactor, spiral board purifying column and blower fan; Described filler purifying column, reaction of low temperature plasma device, catalyst oxidation reactor, spiral board purifying column and blower fan are successively along connecing.The present invention, to reduce device volume, reduces investment cost; Avoid the generation of secondary pollution; The activity and selectivity of very big raising catalyst, reduces catalytic reaction temperature, extending catalyst service life.Foul gas can be removed by efficient stable in normal temperature, normal pressure, normal wet true environment, solve plasma degradation not thoroughly, secondary pollution, catalytic oxidizing equipment is large, investment operating cost high defect, has good practical value.
Description
Technical field
The invention belongs to technical field of chemical, relate to a kind of method and the device that process waste gas, specifically a kind of method of low temperature plasma coupling and catalyzing oxidation removal foul gas and device thereof.Be applied to the process that municipal sewage treatment station, treatment of urban garbage station, Treatment of Sewage Reservoir of Chemical Plant treating stations and other foul smelling gas produce the foul gas in place.
background method
Odor pollution, refers to that having of containing in the materials such as air, water body, discarded object causes people to detest or the volatile materials of unhappy smell, by air dielectric, acts on the olfactory organ of people and perceived a kind of perception (sense of smell) is polluted.It is reported, up to now, the odorant with people's detected by scent just has kind more than 4000, can fall into 5 types: (1) sulfur-containing compound, as hydrogen sulfide, sulfur dioxide, mercaptan, thioether by composition; (2) nitrogen-containing compound, as ammonia, amine, phthalein amine, indoles etc.; (3) halogen and derivative, as chlorine, halogenated hydrocarbons; (4) hydro carbons, as alkane, alkene, alkynes, aromatic hydrocarbon; (5) oxygen-containing organic compound, as alcohol, phenol, aldehyde ketone, organic acid etc.
General employing dilution diffusion method, neutralisation, absorption process, absorption method, heat damage method, microbial method administer odorant pollutant, but said method all defectiveness.Dilution diffusion method be foul gas is drained into air by chimney or with odorless Dilution air to reduce stink, be mainly applicable in process, the foul gas discharged in a organized way of low concentration, but be subject to meteorological condition and limit, odorant still exists.Neutralisation be use in and deodorant to weaken stench sense organ intensity, mainly be applicable to the occasion immediately, temporarily need eliminating the impact of low concentration odorant, can eliminate the impact of foul gas fast, flexibility is large, but foul gas material is not removed, and nertralizer need be added.Absorption process from waste gas, optionally absorbs removing foul gas with suitable absorbent (as water, acid, alkali, plant extraction liquid), mainly be applicable to the process of high concentration, middle concentration odorant, treating capacity is large, method is the most ripe, but treatment effeciency is not high, consume absorbent, odorant pollutant only transfers to liquid phase by gas phase, for this reason in the absorption process pre-treating method that is just used for waste gas as the supplementary means of other administering method and post-processing approach.Absorption method refers to that deodorization adsorbents such as adopting active carbon, amphoteric ion-exchange resin, activated alumina, silica gel, atlapulgite is to process the foul gas of low concentration, is mainly applicable to process low concentration, the foul gas that high purification requires.Although absorption method is higher to low concentration foul gas removal efficiency, but adsorbent need be changed or regenerate, the object thoroughly removing pernicious gas cannot be reached, therefore the method couplings such as normal and heating power oxidation, in addition for containing particle or rubber elastomer class waste gas, adsorbent lost efficacy because active space is blocked, large for adsorbent amount during process atm number, adsorption plant is bulky, and cost of investment is high.Heating power oxidizing process (comprising heating power burning, catalytic combustion and heat-accumulation combustion) refers to that at high temperature odorant and fuel gas are fully mixed, realizes burning completely, is mainly suitable for the flammable foul gas being applicable to process high concentration, little tolerance.But because equipment is perishable, consume fuel, processing cost is high, the defects such as easy formation secondary pollution strongly limit its application, in addition burner requires higher to service condition, for catalytic combustion require more than 200 DEG C run, and for heating power burn and heat-accumulation combustion require more than 700 DEG C run, invest and operating cost high.For the waste gas of sulfur-bearing and halogen, easily cause catalyst poisoning.Bioanalysis refers to and utilizes microbial degradation odorant pollutant and make gas sweetening, mainly be applicable to the removal of biodegradable water-soluble odorant pollutant, but by microbial activity and selectively to affect, must frequently add medicament, control ph, temperature etc., operating cost is relatively high, and microorganism will be once death will need the long period again to cultivate.
Low temperature plasma is a kind of waste gas processing method emerging in recent years, mainly through a large amount of active species produced in plasma discharge processes, these active species and the ozone bombardment contaminant molecule produced by active specy, make it ionize, dissociate and excite, then physics, the chemical reaction of series of complex can be caused, complicated macromolecule contaminant is made to change simple Small molecular safe material into, or make poisonous and harmful substance change the nontoxic or low harmful substances of low toxicity into, thus pollutant is degraded removal.But, plasma can produce the higher intermediate product of toxicity in purification process or molecule larger, than the intermediate product of original molecule more difficult degradation, there is oxidation incomplete sum ozone and remain the problem causing secondary pollution, too high processing cost is also key of its application of restriction simultaneously.
Catalytic oxidation refers under certain pressure and normal temperature condition, is catalyst with metal material, and as Pt, Pd, Ni etc., the oxidants such as the pollutant in waste gas and air, oxygen, ozone carry out oxidation reaction, thus by combustible component oxidation Decomposition harmful in waste gas.Due to the existence of catalyst, can carry out at a lower temperature, initiation temperature is about 250 DEG C-300 DEG C.Relative to other method, more energy-efficient, decrease secondary pollution.Catalytic combustion method, because operating temperature is low and easy firing is complete, becomes and has one of waste gas processing method for low concentration of application prospect most at present.When using catalytic oxidation process waste gas, some gas pollutant oxidation reaction condition is harsh, must need high temperature, high-altitude, high water vapor dividing potential drop, the catalyst therefore selected must possess high activity, high thermal stability and high hydrothermal stability, and certain anti-poisoning capability; Conventional catalyst is the noble metal catalysts such as Pd, Pt, Rh, Au, but these noble metals are expensive, easy-sintering, add catalytic oxidation treatment cost.
Summary of the invention
Goal of the invention: for the deficiencies in the prior art, the object of the present invention is to provide a kind of method of low temperature plasma coupling and catalyzing oxidation removal foul gas, to realizing, low-temperature plasma body method and catalysed oxidation processes are organically combined, while improving purification efficiency, greatly reduce plasma for purification intermediate product to generate, realize purifying fast, thoroughly, efficiently foul gas.Another object of the present invention is to provide a kind of special purpose device of said method.
Technical scheme: in order to realize foregoing invention object, the technical solution adopted in the present invention is:
A kind of method of low temperature plasma coupling and catalyzing oxidation removal foul gas: pending foul gas carries out first order purification by filler purifying column, utilize plant extraction liquid to carry out dedusting, cooling, explosion-proof and carrying out washing treatment to foul gas, reduce odor pollution substrate concentration in air-flow; The foul gas purified through the first order is passed into reaction of low temperature plasma device and carries out second level purification, utilize plasma to carry out decomposing the new harmless products of generation to pernicious gas; The foul gas purified through the second level is passed into catalyst oxidation reactor and carries out third level purification, further oxidize contaminants, pollutant itself is degraded; The foul gas purified through the third level is carried out fourth stage purification by spiral board purifying column, utilizes alkali liquor absorption gases containing stench sulphureous gases and halogen-containing foul gas; Through level Four purification after enter air without odour.
The method of low temperature plasma coupling and catalyzing oxidation removal foul gas of the present invention, for level Four purification method: first say that pending foul gas carries out first order purification by filler purifying column, first order purification is mainly pretreatment, dedusting, cooling, explosion-proof, washing etc., Main Function has: 1) reduce odor pollution substrate concentration in air-flow, alleviate follow-up plasma and catalytic oxidation load: in spray process, plant extraction liquid deodorizing mechanism mainly contains: 1. acid-base reaction, containing alkaloid in plant extraction liquid, can with hydrogen sulfide, hydrogen cyanide radical ion, the foul smell molecular reactions such as ammonia, 2. catalytic oxidation, under the catalytic action of deodorant, hydrogen sulfide can react with the oxygen in air, 3. lewis acid alkali reaction, reacts containing the lewis acid of organosulfur compound and the lewis base generation acid-base neutralization of electronegative atomic group and itrogenous organic substance, 4. redox reaction, in plant extraction liquid, effective molecule has reproducibility, can directly and oxidizing substance carry out redox reaction.2) safe iris action: organic exhaust gas is all generally flammable explosive gas, the waste gas that production method process produces to have unfavorable factor once in a while and produces as accidental single step of releasing electric process when purifying, here packed tower plays a safe insulating effect, and prevention can be fired.3) spraying cooling effect: some waste gas produces after heating, fermenting, when after discharge, also there is certain temperature, general higher than in 150 DEG C, and during plasma purification, temperature is no more than 60 DEG C, so the process by playing cooling after packed tower.4) dedusting, neutralization: containing dust in some waste gas, by can dedusting after filler spray column.
Reaction of low temperature plasma device purifies as the second level, its mechanism of action comprises two aspects: 1) in the process producing plasma, the moment high-energy that high-frequency discharge produces can open the chemical energy of some pernicious gas molecule, makes it to be decomposed into simple substance atom or harmless molecule.2) comprise a large amount of high energy electrons, negative ions, excited state particle in plasma and there is the free radical of strong oxidizing property, these active particles and portion molecular collision combine, under electric field action, emission molecule is in excitation state, when emission molecule obtain energy be greater than its molecular bond energy in conjunction with energy time, the molecular scission of emission molecule, Direct Resolution becomes simple substance atom or obtains innocuous gas molecule by single atomic building.A large amount of OH, O isoreactivity free radical simultaneously produced and the extremely strong O of oxidisability
3, can with pernicious gas molecule generation chemical reaction, finally generate harmless products.
Catalyst oxidation reactor purifies as the third level, and its Main Function is: 1) because catalytic domain and low-temperature plasma tagma exist certain distance, a large amount of short life high energy particle can not arrive catalytic reaction zone, only has picture O
3catalytic reaction zone could be arrived, O with long-life species such as nitrogen oxide
3greatly can improve the activity and selectivity of catalyst, extending catalyst service life, and make catalyst surface form hydroxyl radical free radical, further oxidize contaminants, and itself is degraded, thus controlled accessory substance O well
3generation.2) intermediate by-products that catalyst can optionally produce with plasma is reacted, and obtains desirable catabolite (carbon dioxide and water), improves carbon dioxide selectivity, reduce energy consumption.3) porous filler carrier material generally all has good absorption property, and energy is enrichment odorant pollutant molecule preferably, greatly adds odorant pollutant molecule impels catalytic action carrying out in the time of staying of reaction zone.
Spiral board purifying column purifies as the fourth stage, its Main Function is: 1) for gases containing stench sulphureous gases, organic sulphur obtains inorganic states sulfur dioxide and sulfur trioxide after low-temperature plasma synergistic catalysed oxidn, when adopting spray-absorption, alkali lye can react with sulfur dioxide and sulfur trioxide generation acid-base neutralization and be removed; For nitrogenous foul gas, after purification, obtain inorganic nitrogen oxide, in like manner can remove by soda acid neutralization reaction method.2) for halogen-containing foul gas, halogen atom obtains inorganic states hydrogen halides after low-temperature plasma synergistic catalysed oxidn, in like manner can remove by soda acid neutralization reaction method.
A device for the method for low temperature plasma coupling and catalyzing oxidation removal foul gas, comprises filler purifying column, reaction of low temperature plasma device, catalyst oxidation reactor, spiral board purifying column and the blower fan of connecting successively; Foul gas entrance established by described filler purifying column, described blower fan is provided with gas vent; Described filler purifying column is connected with plant extraction liquid dosing tank; Described spiral board purifying column is connected with alkali lye dosing tank.
Described reaction of low temperature plasma device is made up of several plasma purification storehouse serial or parallel connection UNICOMs; Described plasma purification storehouse comprises several drum type brake low-temperature plasma cavitys.
Be provided with electric heater unit at described catalyst oxidation reactor airflow inlet place, in described catalyst oxidation reactor, be provided with heat exchanger.Air-flow enters spiral board purifying column enter heat exchanger and the heat exchange of plasma tail gas after catalysed oxidn after again.
Described filler purifying column adopts mass concentration to be the plant extraction liquid of 5 ~ 30%; Described plant extraction liquid is the mixed liquor of green-tea extract, Olive leaf P.E, dandelion extract; The composition of described plant extraction liquid be terpene compound, straight chain compound, benzene derivative, vanillic aldehyde, cinnamic acid and geranyl formate one or more; The described volume of filler purifying column and the consumption of absorbing liquid are determined according to pending odorant kind, concentration and flow.
Catalyst is provided with in described catalyst oxidation reactor; Described catalyst comprises carrier and solid solution; Described carrier is scribble Al in hole
2o
3the cordierite honeycomb ceramic carrier of coating; Described solid solution comprises composite metal oxide and noble metal.Described composite metal oxide comprises MnO
2, CoO
2, CuO, ZrO
2and Ce
2o
3; The percentage that described metal oxide accounts for solid solution weight is respectively: MnO
220 ~ 60%, CoO
210 ~ 50%, ZrO
25 ~ 30%, CuO 0 ~ 20%, Ce
2o
30 ~ 10%.Described noble metal is one or more in Pt, Pd, Rh, Ru, It, Au; The percentage that described noble metal accounts for solid solution weight is 1 ~ 5%.The each component of described solid solution forms for A, B, C tri-groups, specifically in table 1.
Table 1 solid solution constituent content percentage (%)
The alkali lye that described spiral board purifying column adopts is NaOH, calcium hydroxide or liquor natrii hypochloritis; Described sodium hydroxide solution mass concentration is 20 ~ 30%, and described aqua calcis is saturated solution, and described liquor natrii hypochloritis's mass concentration is 20 ~ 30%.
The mechanism of process foul gas of the present invention is: first foul gas enters filler purifying column and absorbed by plant extraction liquid, contaminant remaining in reaction of low temperature plasma device by O that electrion produces
3, OH, H
2o
2, the oxidizing species such as O and high energy electron is decomposed into small-molecule substance, the ozone simultaneously generated, carbon monoxide, small-molecule substance are oxidized on catalyst oxidation reactor obtains the product such as oxygen, carbon dioxide, water, nitrogen oxide, oxysulfide, hydrogen halides, finally enter spiral board purifying column fully to be absorbed by alkali lye, enter air from chimney again from the nontoxic air-flow of purifying column process.
Beneficial effect: compared with the conventional method, remarkable advantage of the present invention comprises: 1) the present invention adopts plant extraction liquid filler purifying column greatly can reduce the concentration of odorant pollutant in waste gas as pre-treatment step, thus the volume of plasma reactor and catalyst oxidation reactor can be reduced, effectively can reduce the investment cost of plasma reactor and catalyst oxidation reactor; 2) organic pollutant of the present invention is oxidized to inorganic states gas through reaction of low temperature plasma device major part, and a small amount of formation is easily degraded intermediate by-products, also has specific accessory substance ozone; Intermediate product can in catalyst surface permineralization, and the product after mineralising is discharged after the process of spiral board purifying column, avoids the generation of secondary pollution; Ozone greatly can improve the activity and selectivity of catalyst, reduces catalytic reaction temperature, has both reduced catalyst oxidation reactor energy consumption, again extending catalyst service life; 3) catalyst activity of the present invention is high, and catalytic capability is strong, and initiation temperature is low, more energy-efficient, and catalyst cost comparatively conventional catalyst is low; 4) this device can be used to the flammable foul gas processing high concentration, atm number; Containing the air-flow of foul gas after apparatus of the present invention process, the clearance of each foul gas is all up to more than 95%; 5) this device can remove odorant pollutant by efficient stable in normal temperature, normal pressure, normal wet environment, solve the degraded of existing method not thoroughly, secondary pollution, the defects such as catalyst oxidation reactor energy consumption is high, can not produce the new pollutant such as ozone, nitrogen oxide, oxysulfide, hydrogen halides simultaneously.
Accompanying drawing explanation
Fig. 1 is the process chart of the method for low temperature plasma coupling and catalyzing oxidation removal foul gas.
Detailed description of the invention
Below by specific embodiment, the present invention is further described; it should be pointed out that the commonsense method personnel for this area, under the premise without departing from the principles of the invention; can also make some modification and improvement, these also should be considered as belonging to protection scope of the present invention.
The technological process of the method for low temperature plasma coupling and catalyzing oxidation removal foul gas, as shown in Figure 1, filler purifying column 1, foul gas entrance 2, filler purifying column circulating absorption solution outlet 3, plant extraction liquid dosing tank 4, reaction of low temperature plasma device 5, catalyst oxidation reactor 6, spiral board purifying column absorbing liquid outlet 7, spiral board purifying column 8, alkali lye dosing tank 9, blower fan 10, clean gas outlet 11 is comprised.Filler purifying column 1, reaction of low temperature plasma device 5, catalyst oxidation reactor 6, spiral board purifying column 8 and blower fan 10 are connected successively, filler purifying column 5 is established foul gas entrance 2 and filler purifying column circulating absorption solution outlet 3, blower fan 10 is provided with clean gas outlet 11; Filler purifying column 1 is connected with plant extraction liquid dosing tank 4, and spiral board purifying column 8 is connected for 9 casees with alkali lye dosing.Device is under blower negative pressure effect, and foul gas successively through filler purifying column 1, reaction of low temperature plasma device 5, catalyst oxidation reactor 6, spiral board purifying column 8, is discharged by clean gas outlet 11 after entering from useless foul gas entrance 2 after treatment.
This technique mainly comprises four major parts, i.e. filler purifying column 1, reaction of low temperature plasma device 5, catalyst oxidation reactor 6 and spiral board purifying column 8.Specific as follows:
Filler purifying column 1 main design parameters: absorbing liquid to be mass concentration be 5 ~ 30% plant extraction liquid, plant extract liquid preparing process is: grape wine factory is produced the grape pip that grape wine is remaining, discarded sleeve skin and orange skin, after uniform quality mixing is waited at the broken end of Tea Production and pure water according to 1: 5 ~ 10(g/mL) ratio put into ultrasonic extraction tank and carry out extracting that (wherein ultrasound condition is: ultrasonic power 50 ~ 100W, ultrasonic temperature 20 ~ 30 DEG C, ultrasonic time 30 ~ 60min), extract (commercially available stainless steel tertiary filter) after three-stage filtration dilutes in proportion with pure water again makes technical grade plant extraction liquid.The composition of plant extraction liquid be terpene compound, straight chain compound, benzene derivative, vanillic aldehyde, cinnamic acid and geranyl formate one or more, filler purifying column tower body specification Φ 1200 × H5000, empty tower gas velocity is 0.8 ~ 1.2m/s, sprinkle density 6 ~ 8m
3/ m
2h, liquid-gas ratio controls at 5 ~ 10L/m
3, plant extraction liquid consumption controls at 20kg/d.
Existing reaction of low temperature plasma device kind is more, and the present invention is described to adopt the device in CN202206642U patent document, and this reaction of low temperature plasma device can be made up of several plasma purification storehouse serial or parallel connection UNICOMs; This plasma purification storehouse comprises several drum type brake low-temperature plasma cavitys.Reaction of low temperature plasma device 5 main design parameters: interior electrode external diameter 30mm, external electrode internal diameter 90mm, annular gap length 1000mm, external electrode and interior electrode material all have stainless steel, pointed tooth material is Ti electrode, adjacent teeth distance and spacing are 10mm, and tooth depth is 8mm, and crest voltage is 10 ~ 20kV.
At catalyst oxidation reactor 6 airflow inlet, place is provided with electric heater unit, in catalyst oxidation reactor 6, be provided with heat exchanger.Air-flow enters spiral board purifying column enter heat exchanger and the heat exchange of plasma tail gas after catalysed oxidn after again.Catalyst is provided with in catalyst oxidation reactor 6; Catalyst comprises carrier and solid solution; Carrier is scribble Al in hole
2o
3the cordierite honeycomb ceramic carrier of coating; Solid solution comprises composite metal oxide and noble metal.Composite metal oxide comprises MnO
2, CoO
2, CuO, ZrO
2and Ce
2o
3; The percentage that metal oxide accounts for solid solution weight is respectively: MnO
220 ~ 60%, CoO
210 ~ 50%, ZrO
25 ~ 30%, CuO 0 ~ 20%, Ce
2o
30 ~ 10%.Noble metal is one or more in Pt, Pd, Rh, Ru, It, Au; The percentage that noble metal accounts for solid solution weight is 1 ~ 5%.The each component of solid solution forms for A, B, C tri-groups, specifically in table 1.Catalyst oxidation reactor 6 main design parameters: catalyst uses air speed 30000h
-1, cordierite honeycomb ceramic carrier parameter is hole count 300 holes/mouth cun
2, wall thickness 0.3mm, percent opening 63%, unit weight 0.6g/cm
3, the porosity 45 ~ 150%, specific area 5 ~ 10cm
2/ cm
3, adopt cordierite honeycomb ceramic integral catalyst, on it, load has manganese-cobalt-zirconium-copper solid solution, oxide supporting Pt metal, wherein manganese accounts for 50% of solid solution weight, and cobalt accounts for 30%, and zirconium accounts for 15%, copper accounts for the 2.5wt.% that 5%, Pt metal accounts for solid solution coating, and catalyst light-off temperature is set to 120 DEG C.
Table 1 solid solution constituent content percentage (%)
Spiral board purifying column 8: absorbing liquid is calcium hydroxide, NaOH or liquor natrii hypochloritis, preferred saturated aqua calcis, tower body specification Φ 1200 × H5000, empty tower gas velocity is 4 ~ 5m/s, sprinkle density 10 ~ 15m
3/ (m
2h), liquid-gas ratio controls at 0.5 ~ 0.8L/m
3, alkali lye consumption controls at 40kg/d.The alkali lye that described spiral board purifying column adopts is sodium hydroxide solution or aqua calcis or liquor natrii hypochloritis; Described sodium hydroxide solution mass concentration is 20 ~ 30%, and described aqua calcis is saturated solution, and described liquor natrii hypochloritis's mass concentration is 20 ~ 30%.
Following examples are all carried out based on said apparatus.
Embodiment 1
Vulcanized sodium method of reducing exhaust temperature is 150 DEG C, containing organic and inorganic states sulfide, wherein hydrogen sulfide 349mg/m in tail gas
3, thio-alcohol 246mg/m
3, thioether class 212mg/m
3, oxysulfide 318mg/m
3, air flow rate 3000m
3/ h.Enter filler purifying column to absorb after process through plant extraction liquid, gas flow temperature reduces to 55 DEG C, and in air-flow, hydrogen sulfide reduces to 126mg/m
3, thio-alcohol 178mg/m
3, thioether class 164mg/m
3, oxysulfide 171mg/m
3.Hydrogen sulfide 246mg/m is recorded after the reaction of low temperature plasma device process that crest voltage is 10kV
3, thio-alcohol 36mg/m
3, thioether class 45mg/m
3, oxysulfide 234mg/m
3, ozone 152 mg/m
3, thioaldehydes 86 mg/m
3illustrate that foul gas is by after the process of reaction of low temperature plasma device, most organic sulfide in air-flow are oxidized to hydrogen sulfide or the oxysulfide of inorganic states, and a small amount of easily degraded intermediate by-products that formed, as thioaldehydes, meanwhile also creates specific accessory substance ozone.The gas of discharging from reaction of low temperature plasma device enters catalyst oxidation reactor, and after process, thio-alcohol and thioether class are only containing 11mg/m
3and 9mg/m
3, do not detect thioaldehydes, ozone, hydrogen sulfide reduces to 26mg/m
3, sulfoxide concentration is higher is 367mg/m
3.The air-flow of discharging from catalyst oxidation reactor enters spiral board purifying column after alkali liquor absorption process, and after process, thio-alcohol and thioether class are only containing 4mg/m
3and 6mg/m
3, hydrogen sulfide 3mg/m
3, oxysulfide 5mg/m
3.Visible, containing foul gas air-flow after treatment, the total removal rate of thio-alcohol, thioether class, hydrogen sulfide and oxysulfide is respectively 98.37%, 97.17%, 99.14%, 98.43%.
Embodiment 2
Certain Treatment of Sewage Reservoir of Chemical Plant treating stations exhaust temperature is 30 DEG C, containing thio-alcohol 316mg/m in tail gas
3, thioether class 278mg/m
3, volatile phenol 296mg/m
3, benzene homologues 298mg/m
3, air flow rate 3000m
3/ h.Enter filler purifying column to absorb after process through plant extraction liquid, gas flow temperature reduces to 30 DEG C, and in air-flow, thio-alcohol reduces to 213mg/m
3, thioether class 162mg/m
3, volatile phenol 221mg/m
3, benzene homologues 238mg/m
3.Hydrogen sulfide 132mg/m is recorded after the reaction of low temperature plasma device process that crest voltage is 20kV
3, thio-alcohol 48mg/m
3, thioether class 54mg/m
3, oxysulfide 156mg/m
3, volatile phenol 41mg/m
3, benzene homologues 38mg/m
3, also record ozone 89mg/m simultaneously
3, thioaldehydes 67mg/m
3, formic acid 23mg/m
3, acetic acid 32mg/m
3, oxalic acid 29mg/m
3illustrate that foul gas is by after the process of reaction of low temperature plasma device, part organic sulfide in air-flow is oxidized to hydrogen sulfide or the oxysulfide of inorganic states, a small amount of formation easily degrades intermediate by-products as thioaldehydes, part volatile phenol and benzene homologues oxidized, form easily degraded organic product formic acid, acetic acid and oxalic acid, meanwhile also create specific accessory substance ozone.The gas of discharging from reaction of low temperature plasma device enters catalyst oxidation reactor, and after process, thio-alcohol and thioether class are only containing 12mg/m
3and 11mg/m
3, volatile phenol and benzene homologues are only containing 13mg/m
3and 10mg/m
3, hydrogen sulfide reduces to 16mg/m
3, sulfoxide concentration is higher is 215mg/m
3, do not detect thioaldehydes, ozone, formic acid, acetic acid and oxalic acid.The air-flow of discharging from catalyst oxidation reactor enters spiral board purifying column after alkali liquor absorption process, and after process, thio-alcohol and thioether class are only containing 3mg/m
3and 5mg/m
3, volatile phenol 6mg/m
3, benzene homologues 5mg/m
3, do not detect hydrogen sulfide and oxysulfide.Visible, containing foul gas air-flow after treatment, the total removal rate of thio-alcohol, thioether class, volatile phenol and benzene homologues is respectively 99.05%, 98.20%, 97.97%, 98.32%.
Claims (3)
1. the device of the method for a low temperature plasma coupling and catalyzing oxidation removal foul gas, the method of described low temperature plasma coupling and catalyzing oxidation removal foul gas is: pending foul gas carries out first order purification by filler purifying column, utilize plant extraction liquid to carry out dedusting, cooling, explosion-proof and carrying out washing treatment to foul gas, reduce odor pollution substrate concentration in air-flow; The foul gas purified through the first order is passed into reaction of low temperature plasma device and carries out second level purification, utilize plasma to decompose pernicious gas, generate new harmless products; The foul gas purified through the second level is passed into catalyst oxidation reactor and carries out third level purification, further oxidize contaminants, pollutant itself is degraded; The foul gas purified through the third level is carried out fourth stage purification by spiral board purifying column, utilizes alkali liquor absorption gases containing stench sulphureous gases and halogen-containing foul gas; Uncontaminated gases after level Four purification enters air; It is characterized in that: described device comprises filler purifying column, reaction of low temperature plasma device, catalyst oxidation reactor, spiral board purifying column and the blower fan of connecting successively; Foul gas entrance established by described filler purifying column, described blower fan is provided with gas vent; Described filler purifying column is connected with plant extraction liquid dosing tank; Described spiral board purifying column is connected with alkali lye dosing tank; Described reaction of low temperature plasma device is made up of several plasma purification storehouse serial or parallel connection UNICOMs; Catalyst is provided with in described catalyst oxidation reactor; Described catalyst comprises carrier and solid solution; Described carrier is scribble Al in hole
2o
3the cordierite honeycomb ceramic carrier of coating; Described solid solution comprises composite metal oxide and noble metal; Described composite metal oxide comprises MnO
2, CoO
2, CuO, ZrO
2and Ce
2o
3; The percentage that described metal oxide accounts for solid solution weight is respectively: MnO
220 ~ 60%, CoO
210 ~ 50%, ZrO
25 ~ 30%, CuO 0 ~ 20%, Ce
2o
30 ~ 10%; Described noble metal is one or more in Pt, Pd, Rh, Ru, It, Au; The percentage that described noble metal accounts for solid solution weight is 1 ~ 5%.
2. the device of the method for low temperature plasma coupling and catalyzing oxidation removal foul gas as claimed in claim 1, is characterized in that, be provided with electric heater unit, in described catalyst oxidation reactor, be provided with heat exchanger at described catalyst oxidation reactor airflow inlet place.
3. the device of the method for low temperature plasma coupling and catalyzing oxidation removal foul gas as claimed in claim 1, is characterized in that: described filler purifying column adopts mass concentration to be the plant extraction liquid of 5 ~ 30%; Described plant extraction liquid is the mixed liquor of green-tea extract, Olive leaf P.E, dandelion extract; The composition of described plant extraction liquid be terpene compound, straight chain compound, benzene derivative, vanillic aldehyde, cinnamic acid and geranyl formate one or more.
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| CN104138705B (en) * | 2014-07-23 | 2016-03-23 | 浙江大学 | A kind of chemical emission treating apparatus and treatment process |
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| US6503471B1 (en) * | 1995-08-29 | 2003-01-07 | Korea Institute Of Science & Technology | Process for malodorous gas treatment |
| CA2529732A1 (en) * | 2003-06-17 | 2004-12-29 | Nittetsu Mining Co., Ltd. | Gas processing method and gas processing apparatus utilizing oxidation catalyst and low-temperature plasma |
| CN101234211A (en) * | 2007-12-27 | 2008-08-06 | 上海市政工程设计研究总院 | Device and method for processing municipal utilities foul gas |
| CN201625486U (en) * | 2009-11-16 | 2010-11-10 | 江阴科亚环保设备有限公司 | Plasma garbage incineration waste gas purification machine |
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