CN103638761A - Method and device for removing malodorous gases by low-temperature plasma coupling catalytic oxidation - Google Patents
Method and device for removing malodorous gases by low-temperature plasma coupling catalytic oxidation Download PDFInfo
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- CN103638761A CN103638761A CN201310614024.1A CN201310614024A CN103638761A CN 103638761 A CN103638761 A CN 103638761A CN 201310614024 A CN201310614024 A CN 201310614024A CN 103638761 A CN103638761 A CN 103638761A
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Abstract
本发明公开了一种低温等离子体耦合催化氧化去除恶臭气体的方法及装置，所述恶臭气体经过四级净化后排入大气。所述装置包括填料净化塔、低温等离子体反应器、催化氧化反应器、旋流板净化塔和风机；所述填料净化塔、低温等离子体反应器、催化氧化反应器、旋流板净化塔和风机依次顺接。本发明以减少装置体积，降低投资费用；避免二次污染的发生；极大提高催化剂的活性和选择性，降低催化反应温度，延长催化剂使用寿命。在常温、常压、常湿的真实环境中可以高效稳定去除恶臭气体，解决等离子体降解不彻底、二次污染，催化氧化装置大、投资运行费用高缺陷，具有很好的实用价值。
The invention discloses a low-temperature plasma coupled catalytic oxidation method and device for removing malodorous gas. The malodorous gas is discharged into the atmosphere after four-stage purification. The device includes a packing purification tower, a low temperature plasma reactor, a catalytic oxidation reactor, a swirl plate purification tower and a fan; the packing purification tower, a low temperature plasma reactor, a catalytic oxidation reactor, a swirl plate purification tower and The fans are sequentially connected. The invention reduces the volume of the device, reduces the investment cost, avoids the occurrence of secondary pollution, greatly improves the activity and selectivity of the catalyst, reduces the catalytic reaction temperature, and prolongs the service life of the catalyst. In the real environment of normal temperature, normal pressure and normal humidity, it can efficiently and stably remove odorous gases, solve the defects of incomplete plasma degradation, secondary pollution, large catalytic oxidation device, and high investment and operation costs, and has good practical value.
Description
Technical field
The invention belongs to technical field of chemical, relate to a kind of method and device of processing waste gas, specifically a kind of method and device thereof of low temperature plasma coupling and catalyzing oxidation removal foul gas.Be applied to the processing of the foul gas in municipal sewage treatment station, treatment of urban garbage station, Treatment of Sewage Reservoir of Chemical Plant treating stations and other foul smelling γ-ray emission places.
background method
Odor pollution, refers to that having of containing in the materials such as atmosphere, water body, discarded object causes that people detest or the volatile materials of unhappy smell, by air dielectric, acts on people's olfactory organ and perceived a kind of perception (sense of smell) is polluted.It is reported up to now, with the odorant of people's detected by scent, just have kind more than 4000, by forming, can fall into 5 types: (1) sulfur-containing compound, as hydrogen sulfide, sulfur dioxide, mercaptan, thioether; (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 dilution diffusion method, neutralisation, absorption process, absorption method, heat damage method, the microbial method of adopting administered odorant pollutant, but said method defectiveness all.Dilution diffusion method be foul gas is drained into atmosphere by chimney or with odorless Dilution air to reduce stink, be mainly applicable in processing, the foul gas of discharge in a organized way of low concentration, but be subject to meteorological condition, limit, odorant still exists.Neutralisation be in using and deodorant to weaken stench sense organ intensity, mainly be applicable to immediately, temporarily to eliminate the occasion of low concentration odorant impact, can eliminate fast the impact of foul gas, flexibility is large, but foul gas material is not removed, and need add nertralizer.Absorption process is optionally to absorb and remove foul gas from waste gas with suitable absorbent (as water, acid, alkali, plant extraction liquid), mainly be applicable to the processing 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 is only transferred to liquid phase by gas phase, and absorption process is just used for pre-treating method and the post-processing approach of waste gas as the supplementary means of other improvement methods for this reason.Absorption method refers to that deodorization adsorbents such as adopting active carbon, amphoteric ion-exchange resin, activated alumina, silica gel, atlapulgite processes the foul gas of low concentration, is mainly applicable to process low concentration, the high foul gas requiring that purifies.Although absorption method is higher to low concentration foul gas removal efficiency, but adsorbent need be changed or regenerate, cannot reach the object of thorough removal pernicious gas, therefore the method couplings such as normal and heating power oxidation, for containing particle or rubber elastomer class waste gas, adsorbent lost efficacy because active space is blocked in addition, and during for processing atm number, adsorbent consumption is large, 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 completing combustion, is mainly applicable to process the flammable foul gas of high concentration, little tolerance.But because equipment is perishable, consume fuel, processing cost is high, easily form the defects such as secondary pollution and greatly limited its application, in addition burner is had relatively high expectations to service condition, for catalytic combustion, require 200 ℃ of above operations, and require 700 ℃ of above operations for heating power burning and heat-accumulation combustion, investment and operating cost are 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 be subject to microbial activity and selectively affect, must frequently add medicament, control pH value, temperature etc., operating cost is relatively high, once and microorganism death will need the long period again to cultivate.
Low temperature plasma is emerging in recent years a kind of waste gas processing method, main by a large amount of active species that produce in plasma discharge process, these active species and the ozone bombardment contaminant molecule being produced by active specy, make its ionization, dissociate and excite, then can cause physics, the chemical reaction of series of complex, make complicated macromolecule contaminant change simple little molecule safe material into, or make poisonous and harmful substance change the nontoxic or low harmful substances of low toxicity into, thereby make the pollutant removal of being degraded.But, it is larger that plasma can produce intermediate product or molecule that toxicity is higher in purification process, than the original molecule intermediate product of difficult degradation more, there is oxidation not exclusively and the residual problem that causes secondary pollution of ozone, too high processing cost is also the key that restricts its application simultaneously.
Catalytic oxidation refers under certain pressure and normal temperature condition, take metal material as catalyst, and as Pt, Pd, Ni etc., the oxidants such as the pollutant in waste gas and air, oxygen, ozone carry out oxidation reaction, thereby by harmful combustible component oxidation Decomposition in waste gas.Due to the existence of catalyst, can carry out at a lower temperature, initiation temperature is about 250 ℃-300 ℃.With respect to other method, more energy-efficient, reduced 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 at present most.When using catalytic oxidation to 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 of therefore selecting 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, increased 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, when improving purification efficiency, greatly reduce plasma for purification intermediate product and generate, realize to foul gas fast, thoroughly, purify efficiently.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 purifying through the first order is passed into reaction of low temperature plasma device and carry out second level purification, utilize plasma to decompose and generate new harmless product pernicious gas; The foul gas purifying through the second level is passed into catalyst oxidation reactor and carry out third level purification, further oxidize contaminants, is degraded pollutant itself; The foul gas purifying through the third level is carried out to fourth stage purification by spiral board purifying column, utilize alkali liquor absorption gases containing stench sulphureous gases and halogen-containing foul gas; After purifying, level Four enters atmosphere 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, the first order purifies and 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, in plant extraction liquid, contain alkaloid, 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 airborne oxygen, 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, effectively molecule has reproducibility, can be 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 when purifying, have once in a while that a unfavorable factor produces as: accidental single step of releasing electric process, here packed tower plays a safe insulating effect, and stoping can combustion.3) spraying cooling effect: some waste gas is by producing after heating, fermenting, after discharge, also there is certain temperature, generally higher than in 150 ℃, and temperature is no more than 60 ℃ during plasma purification, so by playing the process of cooling after packed tower.4) dedusting, neutralization: in some waste gas, contain dust, 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 producing the process of plasma, the moment high-energy that high-frequency discharge produces can be opened the chemical energy of some pernicious gas molecule, makes it to be decomposed into simple substance atom or harmless molecule.2) in plasma, comprise a large amount of high energy electrons, negative ions, excited state particle and there is the free radical of strong oxidizing property, these active particles and part emission molecule collision combination, under electric field action, emission molecule is in excitation state, when the energy of emission molecule acquisition is greater than the combination energy of its molecular bond energy, the molecular scission of emission molecule, directly resolves into simple substance atom or obtains innocuous gas molecule by single atomic building.Produced simultaneously a large amount of OH, O isoreactivity free radical and the extremely strong O of oxidisability
3, can with pernicious gas molecule generation chemical reaction, finally generate harmless product.
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 particles can not arrive catalytic reaction zone, only have picture O
3could arrive catalytic reaction zone, O with long-life species such as nitrogen oxide
3can greatly 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 well accessory substance O
3generation.2) catalyst can optionally react with the intermediate by-products of plasma generation, obtains desirable catabolite (carbon dioxide and water), has improved carbon dioxide selectivity, has reduced energy consumption.3) porous filling carrier material generally all has good absorption property, and enrichment odorant pollutant molecule, has greatly increased the carrying out that odorant pollutant molecule impels catalytic action in the time of staying of reaction zone preferably.
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, while adopting spray-absorption, alkali lye can react and be removed with sulfur dioxide and sulfur trioxide generation acid-base neutralization; For nitrogenous foul gas, after purifying, obtain inorganic nitrogen oxide, in like manner available soda acid neutralization reaction method is removed.2) for halogen-containing foul gas, halogen atom obtains inorganic states hydrogen halides after low-temperature plasma synergistic catalysed oxidn, and in like manner available soda acid neutralization reaction method is removed.
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; On described filler purifying column, establish foul gas entrance, on described blower fan, be 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 comprised of several plasma purification storehouse serial or parallel connection UNICOMs; Described plasma purification storehouse comprises several drum type brake low-temperature plasma cavitys.
At described catalyst oxidation reactor airflow inlet, place is provided with electric heater unit, in described catalyst oxidation reactor, is 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 the plant extraction liquid that mass concentration is 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 is one or more of terpene compound, straight chain compound, benzene derivative, vanillic aldehyde, cinnamic acid and geranyl formate; The volume of described filler purifying column and the consumption of absorption liquid are determined according to pending odorant kind, concentration and flow.
In described catalyst oxidation reactor, be provided with catalyst; Described catalyst comprises carrier and solid solution; Described carrier is to 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%.Each component of described solid solution forms that to take tri-groups of A, B, C be example, 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 that the present invention processes foul gas is: first foul gas enters filler purifying column and absorbed by plant extraction liquid, the O that residual contamination thing is produced by electrion in reaction of low temperature plasma device
3, OH, H
2o
2, the strong oxidizing property substance decomposition such as O and high energy electron is small-molecule substance, the ozone, carbon monoxide, the small-molecule substance oxidized product such as oxygen, carbon dioxide, water, nitrogen oxide, oxysulfide, hydrogen halides that obtain on catalyst oxidation reactor that generate simultaneously, finally enter spiral board purifying column and fully absorbed by alkali lye, the nontoxic air-flow of processing from purifying column enters atmosphere from chimney again.
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 can greatly reduce the concentration of odorant pollutant in waste gas as pre-treatment step, thereby can reduce the volume of plasma reactor and catalyst oxidation reactor, can effectively 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 easily degraded intermediate by-products that forms, also has specific accessory substance ozone; Intermediate product can be in catalyst surface permineralization, and the product after mineralising is discharge after spiral board purifying column is processed, and has avoided the generation of secondary pollution; Ozone can greatly 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 is low compared with conventional catalyst; 4) this device can be used to process the flammable foul gas of high concentration, atm number; Contain the air-flow of foul gas after apparatus of the present invention are processed, the clearance of each foul gas is all up to more than 95%; 5) this device can be removed 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 height, 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.
The specific embodiment
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, comprise 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 absorption liquid outlet 7, spiral board purifying column 8, alkali lye dosing tank 9, blower fan 10, clean gas outlet 11.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, on filler purifying column 5, establish foul gas entrance 2 and filler purifying column circulating absorption solution outlet 3, on blower fan 10, be 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, from useless foul gas entrance 2 enters, successively passes through filler purifying column 1, reaction of low temperature plasma device 5, catalyst oxidation reactor 6, spiral board purifying column 8, discharges after treatment by clean gas outlet 11.
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: absorption liquid is that mass concentration is 5 ~ 30% plant extraction liquid, plant extract liquid preparing process is: grape wine factory is produced to the remaining grape pip of grape wine, discarded sleeve skin and orange skin, after the quality such as the broken end of Tea Production are evenly mixed and pure water according to 1: 5 ~ 10(g/mL) ratio put into ultrasonic extraction tank and extract that (wherein ultrasound condition is: ultrasonic power 50 ~ 100W, 20 ~ 30 ℃ of ultrasonic temperature, ultrasonic time 30 ~ 60min), extract (commercially available stainless steel tertiary filter) after three-stage filtration dilutes in proportion and makes technical grade plant extraction liquid with pure water again.The composition of plant extraction liquid is one or more of terpene compound, straight chain compound, benzene derivative, vanillic aldehyde, cinnamic acid and geranyl formate, 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 is controlled at 5～10L/m
3, plant extraction liquid consumption is controlled at 20kg/d.
Existing reaction of low temperature plasma device kind is more, and the present invention be take and adopted device in CN202206642U patent documentation to describe as example, and this reaction of low temperature plasma device can be comprised 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 titanium 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 places are provided with electric heater unit, in catalyst oxidation reactor 6, are 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.In catalyst oxidation reactor 6, be provided with catalyst; Catalyst comprises carrier and solid solution; Carrier is to 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%.Each component of solid solution forms that to take tri-groups of A, B, C be example, specifically in Table 1.Catalyst oxidation reactor 6 main design parameters: catalyst is used air speed 30000h
-1, cordierite honeycomb ceramic carrier parameter is hole count 300 hole/mouths 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, adopting 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 initiation temperature is set to 120 ℃.
Table 1 solid solution constituent content percentage (%)
Spiral board purifying column 8: absorption 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 is controlled at 0.5～0.8L/m
3, alkali lye consumption is controlled 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 ℃, contains 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 after plant extraction liquid absorbs processing, gas flow temperature is reduced to 55 ℃, and in air-flow, hydrogen sulfide is reduced to 126mg/m
3, thio-alcohol 178mg/m
3, thioether class 164mg/m
3, oxysulfide 171mg/m
3.The reaction of low temperature plasma device that is 10kV through crest voltage records hydrogen sulfide 246mg/m after processing
3, thio-alcohol 36mg/m
3, thioether class 45mg/m
3, oxysulfide 234mg/m
3, ozone 152 mg/m
3, thioaldehydes 86 mg/m
3after illustrating that foul gas is processed by 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 forms, as thioaldehydes, has meanwhile also produced specific accessory substance ozone.The gas of discharging from reaction of low temperature plasma device enters catalyst oxidation reactor, and after processing, thio-alcohol and thioether class are only containing 11mg/m
3and 9mg/m
3, not detecting thioaldehydes, ozone, hydrogen sulfide is reduced 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 is processed, and after processing, thio-alcohol and thioether class are only containing 4mg/m
3and 6mg/m
3, hydrogen sulfide 3mg/m
3, oxysulfide 5mg/m
3.Visible, contain the air-flow of foul gas after treatment, total clearance 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 ℃, contains 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 after plant extraction liquid absorbs processing, gas flow temperature is reduced to 30 ℃, and in air-flow, thio-alcohol is reduced to 213mg/m
3, thioether class 162mg/m
3, volatile phenol 221mg/m
3, benzene homologues 238mg/m
3.The reaction of low temperature plasma device that is 20kV through crest voltage records hydrogen sulfide 132mg/m after processing
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
3after illustrating that foul gas is processed by 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 intermediate by-products of easily degrading that forms is as thioaldehydes, part volatile phenol and benzene homologues are oxidized, form easily degraded organic product formic acid, acetic acid and oxalic acid, meanwhile also produced specific accessory substance ozone.The gas of discharging from reaction of low temperature plasma device enters catalyst oxidation reactor, and after processing, 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 is reduced 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 is processed, and after processing, 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, contain the air-flow of foul gas after treatment, total clearance of thio-alcohol, thioether class, volatile phenol and benzene homologues is respectively 99.05%, 98.20%, 97.97%, 98.32%.
Claims (6)
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