CN107441907A - A kind of material boiler smoke multi-pollutant handling process and equipment - Google Patents
A kind of material boiler smoke multi-pollutant handling process and equipment Download PDFInfo
- Publication number
- CN107441907A CN107441907A CN201710691617.6A CN201710691617A CN107441907A CN 107441907 A CN107441907 A CN 107441907A CN 201710691617 A CN201710691617 A CN 201710691617A CN 107441907 A CN107441907 A CN 107441907A
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- CN
- China
- Prior art keywords
- flue gas
- hydroxyl radical
- free radical
- denitrification apparatus
- desulfurizing tower
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000000463 material Substances 0.000 title claims abstract description 18
- 239000000779 smoke Substances 0.000 title claims abstract description 11
- 239000003344 environmental pollutant Substances 0.000 title claims abstract description 10
- 239000003546 flue gas Substances 0.000 claims abstract description 52
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 41
- -1 Hydroxyl radical free radical Chemical class 0.000 claims abstract description 32
- 239000000428 dust Substances 0.000 claims abstract description 31
- 230000003009 desulfurizing effect Effects 0.000 claims abstract description 22
- 239000002028 Biomass Substances 0.000 claims abstract description 17
- 239000007788 liquid Substances 0.000 claims abstract description 10
- 239000007789 gas Substances 0.000 claims abstract description 8
- 238000002485 combustion reaction Methods 0.000 claims abstract description 6
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 4
- 239000000945 filler Substances 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 239000000243 solution Substances 0.000 claims description 9
- 239000007921 spray Substances 0.000 claims description 9
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 8
- 239000000920 calcium hydroxide Substances 0.000 claims description 8
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 8
- 239000007832 Na2SO4 Substances 0.000 claims description 7
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 7
- 239000005864 Sulphur Substances 0.000 claims description 6
- TUJKJAMUKRIRHC-UHFFFAOYSA-N hydroxyl Chemical compound [OH] TUJKJAMUKRIRHC-UHFFFAOYSA-N 0.000 claims description 6
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 5
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 5
- 238000012545 processing Methods 0.000 claims description 5
- 238000005507 spraying Methods 0.000 claims description 5
- 238000006477 desulfuration reaction Methods 0.000 claims description 4
- 230000023556 desulfurization Effects 0.000 claims description 4
- 239000011259 mixed solution Substances 0.000 claims description 4
- 231100000719 pollutant Toxicity 0.000 claims description 4
- 238000013459 approach Methods 0.000 claims description 3
- 238000011049 filling Methods 0.000 claims description 3
- 239000012528 membrane Substances 0.000 claims description 3
- 238000010521 absorption reaction Methods 0.000 claims description 2
- 239000004411 aluminium Substances 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 238000004891 communication Methods 0.000 claims description 2
- 230000014759 maintenance of location Effects 0.000 claims description 2
- 230000003647 oxidation Effects 0.000 claims description 2
- 238000007254 oxidation reaction Methods 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 238000003786 synthesis reaction Methods 0.000 claims description 2
- 238000009827 uniform distribution Methods 0.000 claims description 2
- 239000000919 ceramic Substances 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 abstract description 10
- 239000003500 flue dust Substances 0.000 abstract description 6
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 abstract description 2
- 235000011114 ammonium hydroxide Nutrition 0.000 abstract description 2
- 239000004202 carbamide Substances 0.000 abstract description 2
- 239000002351 wastewater Substances 0.000 abstract description 2
- 238000005406 washing Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000000203 mixture Substances 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- IOVCWXUNBOPUCH-UHFFFAOYSA-N Nitrous acid Chemical compound ON=O IOVCWXUNBOPUCH-UHFFFAOYSA-N 0.000 description 2
- 229910052925 anhydrite Inorganic materials 0.000 description 2
- 235000011116 calcium hydroxide Nutrition 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000003517 fume Substances 0.000 description 2
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 2
- 150000003254 radicals Chemical class 0.000 description 2
- 241001212038 Arcola Species 0.000 description 1
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 1
- 229910001634 calcium fluoride Inorganic materials 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 229910052573 porcelain 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
- 238000011084 recovery Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000000126 substance Substances 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/75—Multi-step processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
- B01D50/20—Combinations of devices covered by groups B01D45/00 and B01D46/00
-
- 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
- B01D53/007—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 irradiation
-
- 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
- B01D53/502—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific solution or suspension
-
- 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
- B01D53/504—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific device
-
- 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
-
- 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/76—Gas phase processes, e.g. by using aerosols
-
- 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
-
- 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/79—Injecting reactants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/30—Alkali metal compounds
- B01D2251/304—Alkali metal compounds of sodium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/40—Alkaline earth metal or magnesium compounds
- B01D2251/404—Alkaline earth metal or magnesium compounds of calcium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/604—Hydroxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Biomedical Technology (AREA)
- Toxicology (AREA)
- Dispersion Chemistry (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a kind of material boiler smoke multi-pollutant handling process and equipment, handled for biomass combustion flue gas, by pipeline by biomass boiler burn caused by flue gas be introduced into SNCR denitration reaction unit and carry out denitration process, by reducing agents such as ammoniacal liquor or urea liquids by the NO in high-temperature flue gasxIt is reduced to N2.Ash-laden gas after denitration process, cyclone dust collectors are entered by pipeline, the larger grit of partial particulate in flue dust leads to be separated in cyclone dust collectors from flue gas, and flue, which enters in desulfurizing tower, carries out desulphurization reaction.Hydroxyl radical free radical denitrification apparatus mainly realizes further removing collaboration dedusting demisting, realizes wastewater zero discharge.
Description
Technical field
The present invention relates to a kind of material boiler smoke to pollute handling process and device more, and in particular to a kind of biomass boiler
The equipment of flue gas multiple pollutant and the minimum discharge technique of technique.
Background technology
With new《Law on Environmental Protection》Landing implement, it is huge that governments at all levels feel more pressure in terms of atmosphere pollution, one after another
Lex loci file is put into effect, the discharge standard of Industrial Boiler particularly medium and small boiler is improved, further carries out consumption of coal total amount
Control, has the characteristics of relatively low ash content, be practically free of sulphur content and low nitrogen burning for biomass fuel, as the medium and small fire coal of replacement
Boiler realizes the necessary ways of cleaning burning.Biomass boiler substitutes coal-fired arcola to be trend of the times, and the task of top priority is biology
How matter boiler realizes minimum discharge, therefore we have developed a kind of biomass boiler flue gas multiple pollutant minimum discharge technique.
The content of the invention
Can be to institute in biomass boiler combustion process the technical problem to be solved in the present invention is to provide the raw technique of one kind
Caused flue dust is handled, and treated flue dust reaches relevant emission standards.
In order to solve the above-mentioned technical problem, the invention provides a kind of material boiler smoke multi-pollutant handling process, pin
Biomass combustion flue gas is handled, it comprises the following steps：
（1）Flue gas caused by biomass combustion in biomass boiler is introduced into progress one-level denitration in SNCR denitration reactor,
Make NO in flue gasxN is converted under reducing agent effect2；
（2）Flue gas after one-level denitration is introduced into cyclone dust collector and carries out primary dust removing processing, to remove dust in flue gas
Particle；
（3）Flue gas after primary dust removing is introduced into desulfurizing tower and carries out the sulphur oxidation that desulfurization process is used to remove in flue gas
Thing；
（4）Flue gas after desulfurizing tower is handled is subjected to two-stage dust removal using bag-type dust；
（5）Flue gas after two-stage dust removal is introduced into hydroxyl radical free radical denitrification apparatus, will will be remained in flue gas using hydroxyl radical free radical
Remaining lower valency NOxIt is oxidized to the NO of high-valence state2Two level denitration is carried out, the NO in flue gas2Pass through Na2SO3At the spray of absorbing liquid
Reason removes, flue gas and then the water smoke passed through in filler collecting layer retention flue gas, Na2SO4And Na2SO3Mixed solution is through gravitational settling
To the bottom of device, then gas removes the remaining moisture in filler collecting layer through demisting layer and directly discharged.
Another technical solution：A kind of equipment for realizing the material boiler smoke multi-pollutant handling process, it includes：
Logical SNCR denitration device, cyclone dust collectors, desulfurizing tower, sack cleaner, hydroxyl radical free radical are sequentially connected by flue
Denitrification apparatus；There is absorption liquid case by pipeline communication on the hydroxyl radical free radical denitrification apparatus.
Further, the cyclone dust collectors are single-cylinder type, its material：Housing is NM360, and liner is the synthesis pottery containing aluminium
Porcelain.
Further, the entrance of the desulfurizing tower is provided with airflow uniform distribution device, is provided with and disappears in the venturi section of the desulfurizing tower
Lime adds mouth, and the outlet port of the venturi section is provided with water and adds mouth, and desulfurization tower bottom is also associated with emptying the valve of Desulphurization
Door.
Further, the hydroxyl radical free radical denitrification apparatus is hollow cavity, and the inner chamber of the cavity is along air current flow direction
It is horizontal positioned；Along air-flow approach axis, the shape of the cavity is gradually extended to the square of middle part by the taper at both ends.
Further, the hydroxyl radical free radical denitrification apparatus cavity interior edge air-flow approach axis is set gradually at least one
Na2SO3Solution spraying device, multiple filling layers collecting layer and multilayer demister layer.
Further, the hydroxyl radical free radical denitrification apparatus front elevational sectional product is provided with hydroxyl radical generator before expanding,
The hydroxyl radical free radical liberation port of hydroxyl radical generator is connected with the air inlet of hydroxyl radical free radical denitrification apparatus.
Further, the filler of the filler collecting layer in the hydroxyl radical free radical denitrification apparatus is the ventilative hard material to block water
Material.
Further, the liquid case that absorbs is by stored Na2SO4And Na2SO3Mixed solution is connected to de- by membrane pump
Sulphur tower.
The technical effects of the invention are that：
1st, the present invention adapts to new environmental standard and fuel forms, using the present invention to flue gas caused by biomass boiler burning
The low price NO after fume treatment can be solved by carrying out processingxContent height cause NOxDischarge the problem of exceeded, realization reaches existing state
The purpose of family's effluent standard.
2nd, the present invention reduces the loss of each several part material by multistep treatment, by denitrification apparatus, cyclone dust collector, takes off
Sulphur tower, pocket type ultra-purifying dust collector etc., the utilization ratio of each several part is improved, reduce the accessory substance during fume treatment.
3rd, hydroxyl radical free radical denitrification apparatus of the invention, is reasonably discharged to flue gas, liquid collect with
Recovery circulation, has saved the production cost of discharge process.Hydroxyl radical free radical denitrification apparatus mainly realizes further efficient NOx removal
Dedusting demisting is cooperateed with, realizes wastewater zero discharge.
Brief description of the drawings
Fig. 1 is the biomass boiler flue gas multiple pollutant minimum discharge process chart of the present invention；
Fig. 2 is the structural representation of hydroxyl denitrification apparatus of the present invention.
Indicated in figure：1.SCNR denitrification apparatus, 2. cyclone dust collectors, 3. desulfurizing towers, 4. pocket type ultra-purifying dust collectors 5.
Hydroxyl radical free radical denitrification apparatus, 6. absorb liquid case, 7. Na2SO3Solution spraying layer, 8. filler collecting layers, 9. demisting layers, 10. is de-
Sulphur tower spray gun, 11. venturi diffusers.
Embodiment
The invention will be further described with specific embodiment below in conjunction with the accompanying drawings, so that those skilled in the art can be with
It is better understood from the present invention and can be practiced, but illustrated embodiment is not as a limitation of the invention.
As shown in figure 1, by pipeline by biomass boiler burn caused by flue gas be introduced into SNCR denitration reaction unit 1
Denitration process is carried out, using burner exhaust heat and conducting self-heating device heat effect, by reducing agents such as ammoniacal liquor or urea liquids by height
NO in warm flue gasxIt is reduced to N2.Ash-laden gas after denitration process, cyclone dust collectors 2 are entered by pipeline, in flue dust
The larger grit of partial particulate leads to be separated in the presence of the centrifugal force of cyclone dust collectors 2 from flue gas.By cyclone dust removal
Flue dust is entered in desulfurizing tower 3 by flue after processing carries out desulphurization reaction.
The main chemical reactions equation occurred in desulfurizing tower is as follows：
CaO + H2O=Ca(OH)2
Ca(OH)2+ SO2=CaSO3·1/2 H2O +1/2 H2O
Ca(OH)2+ SO3=CaSO4·1/2 H2O +1/2 H2O
CaSO3·1/2 H2O+ 1/2O2=CaSO4·1/2 H2O
Ca(OH)2+ CO2=CaCO3 + H2O
2Ca(OH)2+ 2HCl=CaCl2·Ca(OH)2·2H2O（120 DEG C of ＞）
Ca(OH)2+ 2HF=CaF2 + 2H2O
Flue gas completes mixing from bottom air inlet, flue gas and calcium hydroxide before venturi section 11 exports in desulfurizing tower 3.Desulfurizing tower spray gun
10 are located at the exit of venturi section 11.The bottom of desulfurizing tower 3 is provided with ash-removing valve door, for emergency or shuts down stage emission desulfurization
Ash content in tower.The inside of desulfurizing tower 3 is without any moving component and supporting bar.Through being led in desulfurizing tower 3 by the flue gas after treating
Piping is transferred to pocket type ultra-purifying dust collector 4.
Flue dust passes through PPS+PTFE sock filtrations in sack cleaner 4.Retained grit is filtered in sack cleaner 4
Blown and beaten, the dust for being adhered to cloth bag surface is first concentrated in the ash bucket of deduster by pulse during operation, with blanking control
Device processed is reclaimed and handled to dust.Flue gas after the processing of pocket type ultra-purifying dust collector 4 imports hydroxyl by air-introduced machine by pipeline
Free radical denitrification apparatus 5, the air-introduced machine of sack cleaner provide power for the flowing of sack cleaner gas while are also in next step
Hydroxyl Benitration reactor gas flowing provide power.
As shown in Fig. 2 overall chemical reaction equation is as follows：
The haptoreaction of air water molecule and ultralow wavelength light, generate OH；
H2O=OH+H
NO+OH=HONO
HONO+OH=H2O+NO2
2NO2+4Na2SO3=N2+4Na2SO4
Hydroxyl radical generator is set in the front end of hydroxyl radical free radical denitrification apparatus 5, hydroxyl is produced by hydroxyl radical generator
Free radical.Hydroxyl radical free radical mixes with flue gas in the front end of hydroxyl radical free radical denitrification apparatus 5, and hydroxyl radical free radical will in mixed process
The NO of lower valency in flue gasxIt is oxidized to high-valence state nitrogen oxides NO2。
Hydroxyl radical free radical and the NO in flue gasxThe NO generated after reaction2By Na2SO3The washing generation of spraying layer 7 Na2SO4。
Na2SO3Spray washing layer 7 is by Na2SO3The nozzle sets of solution spraying device outwards spray Na2SO3Solution water smoke, in water smoke
Na2SO3With the NO in flue gas2Reaction generation Na after contact2SO4Absorb the NO in flue gas2.Flue gas passes through Na2SO3Spray washing layer 7
Filler collecting layer 8 is set afterwards, and filler collecting layer 8 blocks the water in flue gas by suction-operated.Na2SO3Spray washing layer 7 can
Multilayer is set, part Na is opened or closed by Valve controlling according to actual conditions2SO3Spray washing layer 7.Outside filler collecting layer 8
If metal framework, filler is the ventilative hard material to block water, is filled by hard bigger serface gas permeable material.By filler collecting layer
The Na of 8 retardances2SO4And Na2SO3The aqueous solution collects in the bottom of hydroxyl radical free radical denitrification apparatus 5 through gravitational settling effect.By filling out
Bed of material collecting layer 8 sets multilayer, and filler is installed into all or part of packing layer collecting layer 8 according to actual conditions.Flue gas passes through
Demisting layer 9 is set behind filler collecting layer 8, remove filler collecting layer water vapour in 8 flue gases that can not block.Demisting layer 9 by
Sorbing material composition is integrally formed composition.According to actual conditions to installing defogging material in all or part of demisting layer 9.This implementation
In example, filler collecting layer 8 and demisting layer 9 illustrate exemplified by being provided with two layers.
Na2SO4Solution collecting box 6 is connected with hydroxyl radical free radical denitrification apparatus 5 by pipeline, is collected hydroxyl radical free radical and is taken off
The Na that the bottom of nitre device 5 is deposited2SO4And Na2SO3Mixed solution.Na2SO4Na collected by solution collecting box 62SO4With
Na2SO3Mix membrane pump and return to desulfurizing tower evaporative cooling and desulphurization reaction.The cigarette treated by hydroxyl radical free radical denitrification apparatus 5
Gas, by pipeline or chimney can be directly discharged to.
Embodiment described above is only to absolutely prove preferred embodiment that is of the invention and being lifted, protection model of the invention
Enclose not limited to this.The equivalent substitute or conversion that those skilled in the art are made on the basis of the present invention, in the present invention
Protection domain within.Protection scope of the present invention is defined by claims.
Claims (9)
1. a kind of biomass boiler flue gas multiple pollutant handling process, is handled for biomass combustion flue gas, its feature exists
In it comprises the following steps：
（1）Flue gas caused by biomass combustion in biomass boiler is introduced into progress one-level denitration in SNCR denitration reactor,
Make NO in flue gasxN is converted under reducing agent effect2；
（2）Flue gas after one-level denitration is introduced into cyclone dust collector and carries out primary dust removing processing, to remove dust in flue gas
Particle；
（3）Flue gas after primary dust removing is introduced into desulfurizing tower and carries out the sulphur oxidation that desulfurization process is used to remove in flue gas
Thing；
（4）Flue gas after desulfurizing tower is handled is subjected to two-stage dust removal using bag-type dust；
（5）Flue gas after two-stage dust removal is introduced into hydroxyl radical free radical denitrification apparatus, will will be remained in flue gas using hydroxyl radical free radical
Remaining lower valency NOxIt is oxidized to the NO of high-valence state2Two level denitration is carried out, the NO in flue gas2Pass through Na2SO3At the spray of absorbing liquid
Reason removes, flue gas and then the water smoke passed through in filler collecting layer retention flue gas, Na2SO4And Na2SO3Mixed solution is through gravitational settling
To the bottom of device, then gas removes the remaining moisture in filler collecting layer through demisting layer and directly discharged.
2. a kind of equipment for realizing material boiler smoke multi-pollutant handling process described in claim 1, it is characterised in that it is wrapped
Include：Logical SNCR denitration device, cyclone dust collectors, desulfurizing tower, sack cleaner, hydroxyl free are sequentially connected by flue
Base denitrification apparatus；There is absorption liquid case by pipeline communication on the hydroxyl radical free radical denitrification apparatus.
3. equipment according to claim 2, it is characterised in that the cyclone dust collectors are single-cylinder type, its material：Housing is
NM360, liner are the synthesis ceramics containing aluminium.
4. equipment according to claim 2, it is characterised in that the entrance of the desulfurizing tower is provided with airflow uniform distribution device,
The venturi section of the desulfurizing tower is provided with calcium hydroxide and adds mouth, and the outlet port of the venturi section is provided with water and adds mouth, desulfurizing tower
Bottom is also associated with emptying the valve of Desulphurization.
5. equipment according to claim 2, it is characterised in that the hydroxyl radical free radical denitrification apparatus is hollow cavity,
The inner chamber of the cavity is horizontal positioned along air current flow direction；Along air-flow approach axis, the shape of the cavity by both ends taper
Gradually it is extended to the square of middle part.
6. equipment according to claim 2, it is characterised in that the hydroxyl radical free radical denitrification apparatus cavity interior edge air-flow enters
Enter direction and set gradually at least one Na2SO3Solution spraying device, multiple filling layers collecting layer and multilayer demister layer.
7. equipment according to claim 5, it is characterised in that the hydroxyl radical free radical denitrification apparatus front elevational sectional product expands
Hydroxyl radical generator is provided with before, and hydroxyl radical free radical liberation port and the hydroxyl radical free radical denitration of hydroxyl radical generator fill
The air inlet put is connected.
8. equipment according to claim 6, it is characterised in that the filler collecting layer in the hydroxyl radical free radical denitrification apparatus
Filler be the ventilative hard material to block water.
9. equipment according to claim 6, it is characterised in that the liquid case that absorbs is by stored Na2SO4And Na2SO3It is mixed
Close solution and be connected to desulfurizing tower by membrane pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710691617.6A CN107441907A (en) | 2017-08-14 | 2017-08-14 | A kind of material boiler smoke multi-pollutant handling process and equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710691617.6A CN107441907A (en) | 2017-08-14 | 2017-08-14 | A kind of material boiler smoke multi-pollutant handling process and equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107441907A true CN107441907A (en) | 2017-12-08 |
Family
ID=60492298
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710691617.6A Pending CN107441907A (en) | 2017-08-14 | 2017-08-14 | A kind of material boiler smoke multi-pollutant handling process and equipment |
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| CN (1) | CN107441907A (en) |
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