CN105879566A - Method and device for removing NOx in flue gas by induced reduction of dielectric barrier discharge - Google Patents
Method and device for removing NOx in flue gas by induced reduction of dielectric barrier discharge Download PDFInfo
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- 230000004888 barrier function Effects 0.000 title claims abstract description 44
- 239000003546 flue gas Substances 0.000 title claims abstract description 33
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 27
- 230000009467 reduction Effects 0.000 title claims abstract description 20
- 238000006243 chemical reaction Methods 0.000 claims abstract description 48
- 239000007789 gas Substances 0.000 claims abstract description 39
- 238000006722 reduction reaction Methods 0.000 claims abstract description 27
- 238000010521 absorption reaction Methods 0.000 claims abstract description 21
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 6
- 150000001298 alcohols Chemical class 0.000 claims abstract description 5
- 229930195733 hydrocarbon Natural products 0.000 claims abstract description 5
- 150000002430 hydrocarbons Chemical class 0.000 claims abstract description 5
- 238000007599 discharging Methods 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 11
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 7
- 239000001301 oxygen Substances 0.000 claims description 7
- 229910052760 oxygen Inorganic materials 0.000 claims description 7
- 230000002860 competitive effect Effects 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 238000003379 elimination reaction Methods 0.000 claims description 4
- 239000007769 metal material Substances 0.000 claims description 4
- 239000011148 porous material Substances 0.000 claims description 4
- 239000010453 quartz Substances 0.000 claims description 4
- 241000894007 species Species 0.000 claims description 4
- 229910021536 Zeolite Inorganic materials 0.000 claims description 3
- 239000004927 clay Substances 0.000 claims description 3
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 239000000741 silica gel Substances 0.000 claims description 3
- 229910002027 silica gel Inorganic materials 0.000 claims description 3
- 239000010457 zeolite Substances 0.000 claims description 3
- 240000007594 Oryza sativa Species 0.000 claims description 2
- 235000007164 Oryza sativa Nutrition 0.000 claims description 2
- 239000002250 absorbent Substances 0.000 claims description 2
- 230000002745 absorbent Effects 0.000 claims description 2
- 230000007797 corrosion Effects 0.000 claims description 2
- 238000005260 corrosion Methods 0.000 claims description 2
- 238000001601 dielectric barrier discharge ionisation Methods 0.000 claims description 2
- 239000003989 dielectric material Substances 0.000 claims description 2
- 235000021186 dishes Nutrition 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 239000002808 molecular sieve Substances 0.000 claims description 2
- 235000009566 rice Nutrition 0.000 claims description 2
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims description 2
- 230000026676 system process Effects 0.000 claims 1
- 239000003638 chemical reducing agent Substances 0.000 abstract description 9
- 239000003054 catalyst Substances 0.000 abstract description 7
- 230000008901 benefit Effects 0.000 abstract description 6
- 230000007613 environmental effect Effects 0.000 abstract description 6
- 230000002829 reductive effect Effects 0.000 abstract description 6
- 231100000572 poisoning Toxicity 0.000 abstract description 3
- 230000000607 poisoning effect Effects 0.000 abstract description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 15
- 230000008569 process Effects 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 5
- 230000001603 reducing effect Effects 0.000 description 5
- 238000006477 desulfuration reaction Methods 0.000 description 4
- 230000023556 desulfurization Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000001179 sorption measurement Methods 0.000 description 4
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical class [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 3
- 238000005267 amalgamation Methods 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 238000000746 purification Methods 0.000 description 3
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 2
- 239000003463 adsorbent Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010531 catalytic reduction reaction Methods 0.000 description 2
- 238000003795 desorption Methods 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000809 air pollutant Substances 0.000 description 1
- 231100001243 air pollutant Toxicity 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 235000013877 carbamide Nutrition 0.000 description 1
- 230000009849 deactivation Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 230000002977 hyperthermial effect Effects 0.000 description 1
- 239000010808 liquid waste Substances 0.000 description 1
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical compound S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 description 1
- 230000004083 survival effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- 238000004056 waste incineration Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/32—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by electrical effects other than those provided for in group B01D61/00
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/102—Carbon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/106—Silica or silicates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/106—Silica or silicates
- B01D2253/108—Zeolites
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/40—Nitrogen compounds
- B01D2257/404—Nitrogen oxides other than dinitrogen oxide
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/80—Employing electric, magnetic, electromagnetic or wave energy, or particle radiation
- B01D2259/818—Employing electrical discharges or the generation of a plasma
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/10—Capture or disposal of greenhouse gases of nitrous oxide (N2O)
Landscapes
- Chemical & Material Sciences (AREA)
- Treating Waste Gases (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
Abstract
The invention belongs to the technical field of environmental protection and particularly relates to a method and a device for removing NOx in flue gas by induced reduction of dielectric barrier discharge. The method is characterized in that reductive gas is ionized or dissociated by utilizing dielectric barrier discharge to generate reductive active groups; the reductive active species are utilized to generate reductive reaction with the NOx; and the reductive gas is ammonia, hydrocarbons or alcohols. The device comprises an air inlet control valve, a selective absorption unit, a reductive-gas input control valve, a mixer, a dielectric barrier discharge plasma reaction unit and a pulse power supply. The method and the device have the advantages that the electrochemical principle is utilized to induce chemical reduction and further remove the NOx; no catalyst is needed, so that the problems of poisoning, replacement, temperature influence and the like caused by existence of the catalyst are avoided; in addition, the applicable temperature range is wide and the operation is flexible and convenient.
Description
Technical field
The invention belongs to environmental protection technical field, be specifically related to NO in a kind of medium barrier discharging induced reduction removing flue gas x The method and apparatus of (nitre).
Background technology
Atmospheric pollution is one of the most serious environmental problem of being faced of 21st century human society survival and development, one of topmost task, especially nitrogen oxides (NO during wherein the Environmental capacity of sulfur dioxide in flue gas and nitrogen oxides is current Air Pollution Control field x ) itself it is not only the atmosphere pollution to human health, and be that air secondary pollution can suck minuteness particle (PM2.5) and ozone (O3) important as precursors thing, greenhouse effect and photochemical pollution can be caused, be also the significant contribution person of acid rain, have a strong impact on the living environment of the mankind.Due to China NO x Discharge capacity is huge, makes PM in air2.5And O3Concentration remain high, time often result in haze weather, health and ecological environment are caused huge harm.In order to reduce haze weather, improve regional air quality, carry out NO x Removing sulfuldioxide exploitation receives much concern.
China is to NO x The more and more attention of decontrol, to NO in flue gas x Emission request more and more stricter, the standards such as fossil-fuel power plant atmospheric pollutant emission standard (GB13223-2011), " emission standard of air pollutants for boilers " (GB13271-2014), " consumer waste incineration Environmental capacity standard " (GB18485-2014) are the most in succession put into effect, to NO x Discharge have higher requirement, stricter provincial standard has even been put into effect in some area.
Further strict along with the promulgation of new pollutant emission standard and atmosphere pollutants emission standards, NO in flue gas x The pressure of qualified discharge is increasing.Gas denitrifying technology is also faced with unprecedented pressure.How to cut down and control the NOx that flue gas produces to pollute and become China's energy and severe challenge that environmental protection department faces.
Reducing process denitration is because it is by NO x Reduction becomes N2, there is secondary pollution little, there is not the advantages such as liquid waste processing problem, become NO x The prefered method of removing, has good development prospect.But in existing reproducibility method, selective catalytic reduction (SCR), the easy poisoning and deactivation of catalyst, need periodic replacement, investment and operating cost are higher；SNCR method (SNCR), denitration efficiency is the highest, and carbamide or ammoniacal liquor consumption are greatly, NH3It is oxidized easily as NO x , the requirement controlling spray ammonia is the highest, and reliability of operation and stability are difficult to reach requirement；Non-selective catalytic reduction (NSCR) uses the noble metals such as Pt, Pd, and catalyst cost is high, is easily poisoned, and running temperature needs more than 500 DEG C, and existing flue-gas temperature condition is difficult to meet this temperature requirement.Therefore, develop standby and substitute flue gas NO x Reproducibility removing sulfuldioxide is the most necessary.
The present invention uses a kind of dielectric barrier discharge plasma method, induced chemical reduction removing NO x Technology.The present invention utilizes in discharge process because ionizing and excite the gaseous reducing agent of interpolation, produces substantial amounts of strong reducing property group, and utilizes these reproducibility active specy and NO x Reduction reaction is occurred to remove it.It is simple that this technology has technique, NO x Removal efficiency is high, strong adaptability, runs and investment cost is the most relatively low, and the advantage such as good with the purification technique amalgamation of existing flue gas desulfurization.
Summary of the invention
It is an object of the invention to provide a kind of efficiency high, strong adaptability, runs NO in the medium barrier discharging induced reduction removing flue gas relatively low with investment cost x Method and apparatus.
NO in the medium barrier discharging induced reduction removing flue gas that the present invention provides x Method, be to utilize dielectric barrier discharge ionization or the reducibility gas that dissociates, produce reproducibility active group, and utilize these reproducibility active specy and NO x Reduction reaction occurs, and described reducibility gas is ammonia, hydro carbons, alcohols etc., and concrete reaction is:
With ammonia as reducing agent:
With hydro carbons as reducing agent:
With alcohols as reducing agent:
。
NO in the medium barrier discharging induced reduction removing flue gas that the present invention provides x Device, including air intake control valve, selective absorption unit, reducibility gas input control valve, blender, dielectric barrier discharge plasma reaction member, the pulse power.Apparatus structure forms as shown in Figure 1.Wherein, air intake control valve is used for controlling flue gas and enters flow, and selective absorption unit is used for placing selective absorbent, adsorbs the flue gas entered, and reduces the oxygen in reaction system and the oxidisability competitive reaction that produces；Reducibility gas input control valve is for controlling the flow of reducibility gas；Dielectric barrier discharge plasma reaction member and the pulse power form a NO elimination reaction unit, are used for carrying out plasma-induced reduction removing NO reaction.
Flue gas through air intake control valve, enters selective absorption unit from air inlet, and the flue gas processed through absorbing unit enters blender by pipeline；Meanwhile, reducibility gas source enters blender by input control valve, makes flue gas and reducibility gas mix in a mixer, then enters dielectric barrier discharge plasma reaction member by pipeline, reacts；Finally, treated gas discharges (can pass through air-introduced machine) from the outlet of dielectric barrier discharge plasma reaction member.Expellant gas is stripped of NO the most completely x .The pulse power provides power supply for dielectric barrier discharge plasma reaction member.
In the present invention, during use, can be arranged side by side by multiple devices, alternate run.Specifically can configure appropriate number of device according to nitrous oxides concentration and the difference running the control cycle.
In the present invention, the effect of selective absorption unit is the oxygen reduced in reaction system and the oxidisability competitive reaction produced, and concrete principle is:
NO molecular diameter is less than oxygen molecule, thus diffusion velocity is faster than oxygen, therefore the speed of adsorbent NO is also fast, by controlling adsorption time so that on adsorbent primary attachment be NO.After the absorption of one of them selective absorption unit is saturated, by switching control valve, open another group selection absorbing unit working procedure.Saturated selective absorption unit is then by the swabbing action of rearmounted air-introduced machine, realize transformation vacuum desorption, it is desorbed the reducibility gas of NO gas out and input after blender is sufficiently mixed, drain into dielectric barrier discharge plasma reaction tank, plasma-induced reduction removing NO is carried out at this, after reaction completely, finally discharged by air-introduced machine.
In the present invention, described selective absorption unit uses gallery structure form, and adsorbing material is the porous material with micropore, such as with materials such as molecular sieve, zeolite, clay ore deposit, silica gel, activated carbons.Charging quantity is determined according to NO concentration, process air quantity and adsorption time.
In the present invention, blender is used for NO and the mixing of reducibility gas, is beneficial to the reaction of follow-up removing NO.Blender uses the forms such as deflector type, spiral or jetting type, and material is corrosion resistant metal.
In the present invention, dielectric barrier discharge plasma reaction member and plasma electrical source form a NO elimination reaction unit.Structure is as shown in Figure 2 for dielectric barrier discharge plasma reaction member (also referred to as reaction tank).Wherein, dielectric barrier discharge plasma reaction member uses double-layer sleeve structure, and inside and outside two-layer pipe keeps with one heart away from no more than 5mm.Interlevel dielectrics tubing matter is the resistant materials such as quartz, pottery, polytetrafluoro, and one end is airtight, and the other end stretches out outside air outlet, lays conductive metallic material in inner tube, and entangled with interior electrode outlet line one end.Outer media tubing matter is also the resistant materials such as quartz, pottery, polytetrafluoro, and one end connects with an air inlet, and is laid with perforation air distribution plate at straight length；The outer media pipe other end and an air outlet tangentially connect；Outer media pipe outer wall lays conductive metal material, and bonds with external electrode lead-out wire one end.Dielectric barrier discharge plasma reaction member uses middle air intake, the tangential air-out in side mode, facilitates electrode to draw and connects, being also beneficial to gas distribution in reaction tank.Internal and external electrode lead-out wire connects with the pulse power respectively.
Wherein, described air outlet is with outer medium tube connected mode as shown in Figure 3.
Wherein, described perforation air distribution plate barrel hole size is by the flow velocity 3-5 m/s that eats dishes without rice or wine, and eyelet is the most uniform, and eyelet quantity processes air quantity according to system and determines.
Advantages of the present invention
Compared with existing similar Technology, the invention have the advantages that
(1) in reaction system, input reducibility gas, utilize electrochemical principle induced chemical reduction removing NO x , it is not necessary to catalyst, it is to avoid the problems such as the poisoning that exists because using catalyst, replacing, temperature impact；
(2) Applicable temperature scope is wide, normally can be suitable for from room temperature condition to 300 DEG C；
(3) have desulfidation concurrently, synchronized desulfuring and denitrifying can be realized；
(4) selective absorption unit is used, effective oxidisability competitive reaction reducing oxygen participation reaction and cause；
(5) flexible operation, plug and play；
(6) good with the purification technique amalgamation of existing flue gas desulfurization, it is achieved the way of denitration again after desulfurization, it is not necessary to hyperthermic treatment, and do not have oxysulfide that catalyst is affected problem.
The present invention uses a kind of dielectric barrier discharge plasma method, induced chemical reduction removing NO x .The present invention utilizes in discharge process because ionizing and excite the gaseous reducing agent of interpolation, produces substantial amounts of strong reducing property group, and utilizes these reproducibility active specy and NO x Reduction reaction is occurred to remove it.And use selective absorption unit, Preferential adsorption nitrogen oxides, the oxidisability competitive reaction that reduction oxygen participates in reaction and causes.Meanwhile, use the modularity method of operation of alternate run, and according to nitrous oxides concentration, modularity quantity is adjusted flexibly.It is simple that the present invention has technique, NO x Removal efficiency is high, strong adaptability, runs and investment cost is the most relatively low, and the advantage such as good with the purification technique amalgamation of existing flue gas desulfurization.
The feature of the present invention
1, utilize dielectric impedance gas discharge to encourage reducibility gas, produce reproducibility active group, and for electronation denitrification process；
2, reducibility gas used is ammonia, hydro carbons, alcohols etc.；
3, selective absorption unit is used, Preferential adsorption nitrogen oxides, the oxidisability competitive reaction that reduction oxygen participates in reaction and causes；
4, adsorbing material is the porous material with micropore, the material such as useful molecules sieve, zeolite, clay ore deposit, silica gel, activated carbon；
5, selective absorption unit uses gallery type version, and vapour lock is little, and desorption is fast；
6, dielectric barrier discharge plasma reaction tank uses middle air intake, the tangential air-out in side mode, beneficially air flow method；
7, through blender and air distribution plate before nitrogen oxides and reducibility gas react, reaction is conducive to；Blender uses the forms such as deflector type, spiral or jetting type, and air distribution plate uses the radial equal mode for cloth of eyelet；
8, use the modularity method of operation of alternate run, and according to nitrous oxides concentration, modularity quantity is adjusted flexibly.
Accompanying drawing explanation
Fig. 1 is that plasma-induced reducing process removes NO x System composition diagram.
Fig. 2 is dielectric barrier discharge response system figure.
Fig. 3 is that air outlet is connected figure with outer medium tube.
Label in figure: 1-air intake control valve；2-selective absorption unit；3-reducibility gas input control valve；4-blender；5-dielectric barrier discharge plasma reaction tank；The 6-pulse power；7-air intake control valve；8-selective absorption unit；9-reducibility gas input control valve；10-blender；11-dielectric barrier discharge plasma reaction tank；The 12-pulse power；13-air inlet；The outer medium tube of 14-；15-air distribution plate；16-external electrode；Electrode in 17-；18-air outlet；Medium tube in 19-；Electrode outlet line in 20-；21-external electrode lead-out wire.
Detailed description of the invention
Shown in Fig. 1 being two groups hands over device for the pattern run.Label 1,2,3,4,5,6 is followed successively by the air intake control valve of a device, selective absorption unit, reducibility gas input control valve, blender, dielectric barrier discharge plasma reaction member, the pulse power；Label 7,8,9,10,11,12 is followed successively by the air intake control valve of another device, selective absorption unit, reducibility gas input control valve, blender, dielectric barrier discharge plasma reaction member, the pulse power.
The concrete operations of device are as follows:
1. air intake control valve 1 is opened, close reducibility gas input control valve 3, air intake control valve 7, reducibility gas input control valve 9, start to input nox contained waste gas, after certain time, close air intake control valve 1, open reducibility gas input control valve 3 and air intake control valve 7 simultaneously, and open dielectric barrier discharge plasma reaction member 5；
2. after certain time, close valve reducibility gas input control valve 3 and air intake control valve 7, open air intake control valve 1 and reducibility gas input control valve 9, and start dielectric barrier discharge plasma reaction member 11 simultaneously and close dielectric barrier discharge plasma reaction member 5.
1. and 2. again after certain time, above operating procedure is repeated.
Claims (7)
1. NO in a medium barrier discharging induced reduction removing flue gas x Method, it is characterised in that concretely comprise the following steps: utilize dielectric barrier discharge ionization or the reducibility gas that dissociates, produce reproducibility active group；Utilize these reproducibility active specy and NO x Reduction reaction occurs, and described reducibility gas is ammonia, hydro carbons or alcohols.
2. NO in a medium barrier discharging induced reduction removing flue gas x Device, it is characterised in that including: air intake control valve, selective absorption unit, reducibility gas input control valve, blender, dielectric barrier discharge plasma reaction member, the pulse power；Wherein, air intake control valve is used for controlling flue gas and enters flow, and selective absorption unit is used for placing selective absorbent, adsorbs the flue gas entered, and reduces the oxygen in reaction system and the oxidisability competitive reaction that produces；Reducibility gas input control valve is for controlling the flow of reducibility gas；Dielectric barrier discharge plasma reaction member and the pulse power form a NO elimination reaction unit, are used for carrying out plasma-induced reduction removing NO reaction；
Flue gas through air intake control valve, enters selective absorption unit from air inlet, and the flue gas processed through absorbing unit enters blender by pipeline；Meanwhile, reducibility gas source enters blender by input control valve, makes flue gas and reducibility gas mix in a mixer, then enters dielectric barrier discharge plasma reaction member by pipeline, reacts；Finally, treated gas is discharged from the outlet of dielectric barrier discharge plasma reaction member；The pulse power provides power supply for dielectric barrier discharge plasma reaction member.
NO in medium barrier discharging induced reduction removing flue gas the most according to claim 2 x Device, it is characterised in that described selective absorption unit uses gallery structure form, and adsorbing material is the porous material with micropore, and described porous material includes with molecular sieve, zeolite, clay ore deposit, silica gel, activated carbon.
4. according to NO in the medium barrier discharging induced reduction removing flue gas described in Claims 2 or 3 x Device, it is characterised in that described blender uses deflector type, spiral or jetting type, and material is corrosion resistant metal.
NO in medium barrier discharging induced reduction removing flue gas the most according to claim 4 x Device, it is characterised in that described dielectric barrier discharge plasma reaction member and plasma electrical source form a NO elimination reaction unit；Wherein, dielectric barrier discharge plasma reaction member uses double-layer sleeve structure, and inside and outside two-layer pipe keeps with one heart away from no more than 5mm；Interlevel dielectrics tubing matter is quartz, pottery, polytetrafluoro resistant material, and one end is airtight, and the other end stretches out outside air outlet, lays conductive metallic material in inner tube, and entangled with interior electrode outlet line one end；Outer media tubing matter is also quartz, pottery, polytetrafluoro resistant material, and one end connects with an air inlet, and is laid with perforation air distribution plate at straight length；The outer media pipe other end and an air outlet tangentially connect；Outer media pipe outer wall lays conductive metal material, and bonds with external electrode lead-out wire one end；Internal and external electrode lead-out wire connects with the pulse power respectively.
6. according to NO in the medium barrier discharging induced reduction removing flue gas described in claim 2,3 or 5 x Device, it is characterised in that described perforation air distribution plate barrel hole size is by the flow velocity 3-5 m/s that eats dishes without rice or wine, and eyelet is the most uniform, eyelet quantity according to system process air quantity determine.
7. according to NO in the medium barrier discharging induced reduction removing flue gas described in claim 2,3 or 5 x Device, it is characterised in that arranged side by side by multiple devices, alternate run.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610360450.0A CN105879566B (en) | 2016-05-28 | 2016-05-28 | NO in the medium barrier discharging induced reduction removing flue gas of one kindxMethod and apparatus |
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| CN113350985A (en) * | 2021-06-04 | 2021-09-07 | 北京化工大学 | Plasma-based denitration device and method |
| CN113440989A (en) * | 2021-08-11 | 2021-09-28 | 河南三棵树新材料科技有限公司 | Dielectric barrier discharge reactor for in-situ purification of pollutants by carbon nano tube and application |
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