CN106345244A - Device and method for removing sulfur trioxide from coal-fired flue gas - Google Patents
Device and method for removing sulfur trioxide from coal-fired flue gas Download PDFInfo
- Publication number
- CN106345244A CN106345244A CN201610901106.8A CN201610901106A CN106345244A CN 106345244 A CN106345244 A CN 106345244A CN 201610901106 A CN201610901106 A CN 201610901106A CN 106345244 A CN106345244 A CN 106345244A
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- Prior art keywords
- flue
- alkaline absorbent
- spray gun
- coal
- absorbent
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- 239000003546 flue gas Substances 0.000 title claims abstract description 61
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 55
- AKEJUJNQAAGONA-UHFFFAOYSA-N sulfur trioxide Chemical compound O=S(=O)=O AKEJUJNQAAGONA-UHFFFAOYSA-N 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000002250 absorbent Substances 0.000 claims abstract description 86
- 230000002745 absorbent Effects 0.000 claims abstract description 86
- 239000007921 spray Substances 0.000 claims abstract description 64
- 239000003513 alkali Substances 0.000 claims abstract description 12
- 230000003068 static effect Effects 0.000 claims abstract description 12
- 239000008187 granular material Substances 0.000 claims description 38
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 26
- 241001625808 Trona Species 0.000 claims description 26
- 239000007787 solid Substances 0.000 claims description 10
- 238000002347 injection Methods 0.000 claims description 9
- 239000007924 injection Substances 0.000 claims description 9
- 230000003009 desulfurizing effect Effects 0.000 claims description 8
- 239000007789 gas Substances 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 8
- 239000013618 particulate matter Substances 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 6
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical class [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 5
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical class [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 3
- KEAYESYHFKHZAL-UHFFFAOYSA-N Sodium Chemical class [Na] KEAYESYHFKHZAL-UHFFFAOYSA-N 0.000 claims description 3
- 239000002594 sorbent Substances 0.000 claims description 2
- 241000894007 species Species 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims 2
- 239000000463 material Substances 0.000 claims 1
- 239000003054 catalyst Substances 0.000 description 8
- 230000000903 blocking effect Effects 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 235000019504 cigarettes Nutrition 0.000 description 3
- 239000003245 coal Substances 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- 239000011593 sulfur Substances 0.000 description 3
- BIGPRXCJEDHCLP-UHFFFAOYSA-N ammonium bisulfate Chemical compound [NH4+].OS([O-])(=O)=O BIGPRXCJEDHCLP-UHFFFAOYSA-N 0.000 description 2
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 230000004580 weight loss Effects 0.000 description 2
- 239000002585 base Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- -1 feed bin Chemical compound 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
- 230000000607 poisoning effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000011144 upstream manufacturing 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/508—Sulfur oxides by treating the gases with solids
-
- 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
- B01D53/81—Solid phase processes
- B01D53/83—Solid phase processes with moving reactants
-
- 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
Abstract
The invention relates to a device and a method for removing sulfur trioxide from coal-fired flue gas. The device comprises a rough stock bin, a screw type feeder, an air gradation mill, a fine stock bin and a weightless type feeder which are connected with each other in turn, wherein the lower part of the weightless type feeder is connected with a main pipeline; air from an air feeder is dried by an air dryer and then is fed into the main pipeline; an alkali absorbent from the weightless type feeder is pneumatically transmitted; a main pipeline terminal is connected with separators; the main pipeline is uniformly divided into a plurality of branches by the separators; a spray gun is respectively connected with each branch; the spray guns are uniformly arranged on a cross section of a flue; a static mixer is arranged on a downstream flue of the spray guns; the alkali absorbents sprayed by the spray guns are uniformly mixed with the flue gas. The device can select different alkali absorbents according to different flue gas conditions and flue positions. The spray guns are used for jetting the alkali absorbents into the flue for absorbing SO3 in the flue gas, so that the harm of SO3 to the operation of the power plant is reduced and the ultralow SO3 emission is realized.
Description
Technical field
The invention belongs to atmosphere pollution Treatment process field, concretely relate to a kind of coal-fired flue-gas sulfur trioxide and take off
Except apparatus and method.
Background technology
so2And noxIt is one of main atmosphere pollution in coal-fired plant flue gas, in order to reduce noxDischarge, coal-fired electricity
Factory is mounted with scr denitrification apparatus mostly.Scr catalyst there is a possibility that part so2It is catalytically oxidized to so3, add generation in stove
so3, make so3Reach finite concentration, power plant is worked the mischief, for example, make catalyst poisoning, air preheater blocking, boiler flue corrosion etc..Quiet
Electric cleaner and wet desulfuration tower are to so3Removing limited in one's ability, so3Be discharged in air haze can be made to increase, cause environment
Pollution.In burning high sulfur coal, so3The problem causing is more serious.Realize so3Deep removal, to the safety economy of power plant fortune
The improvement of row and atmospheric environment is significant.
In order to reduce so3Run, to power plant, the harm bringing and control so3Discharge, many at present spray using in flue
The method entering alkaline absorbent.Chinese patent cn103055684a discloses a kind of utilization trona and removes sulfur trioxide in flue gas
Device and technique, absorb so from scr reactor outlet flue gas through trona serosity hydro-peening3, enter back into air preheater；China is specially
Sharp cn104857841a discloses a kind of device of sulfur trioxide in removing flue gas, including feed bin, screw(-type) feeder, ejecting gun,
Benitration reactor and spoiler etc., absorb so before Benitration reactor by spraying strong alkaline substance3；Chinese patent cn
The method that 104474897a discloses sulfur trioxide in a kind of removing coal-fired flue-gas, the flue to before denitrification apparatus entrance point
In flue between interior, denitration outlet end and air preheater flue gas in spray a certain amount of alkali grain, by cigarette
Sulfur trioxide removing in gas.Although said method can to a certain degree control so3Discharge, but can not successfully manage not
With so under flue gas condition3Removing is it is impossible to reach so well3The requirement of minimum discharge.
Content of the invention
For so in coal-fired flue-gas3The problem producing, the present invention proposes a kind of coal-fired cigarette being applied to different flue gas conditions
Gas sulfur trioxide removing means and method.For the difference of different coal-fired plant flue gas conditions, according to temperature, so of flue gas3
The conditions such as concentration, atmosphere, spray alkaline absorbent, so in efficient removal flue gas in different flue positions3, reduce so3To power plant
The harm of equipment, reaches so3The requirement of minimum discharge.
A kind of coal-fired flue-gas sulfur trioxide removing means, including flue, described device also includes being sequentially connected logical coarse fodder
Storehouse, screw batcher, air classification mill, fines storehouse, loss-in-weight feeders, main pipeline, separator and spray gun, described spray gun sets
Put in flue, in the downstream flue of spray gun, be disposed with static mixer；Described main pipeline is also by dried-air drier and air-supply
Machine is connected.
Weight loss feeder bottom of the present invention is connected with main pipeline, and the air of pressure fan is sent into after being dried through dried-air drier
Main pipeline, using the air conveying alkaline absorbent from Weight loss feeder；Main pipeline terminal is connected with separator, separator
Main pipeline is uniformly divided into multiple branch roads, each branch road connects a spray gun；Spray gun is evenly arranged in flue cross section, and in spray
The downstream flue of rifle installs static mixer it is ensured that the alkaline absorbent of lance ejection is uniformly mixed with flue gas.According to different
Flue gas condition and flue position, select different types of alkaline absorbent, spray alkaline absorbent by spray gun inhale in flue
Receive so in flue gas3, reduce so3The harm that power plant is run, realizes so3Minimum discharge.
Preferably, described main pipeline is connected with several pipeline branch roads by separator, each pipeline branch road is divided equally
It is not connected with corresponding spray gun.
Preferably, described fines storehouse is sealing device, and built with drying device, prevent alkaline absorbent because of water suction
The reunion that causes, fouling, blocking pipeline etc.；The quantity of described pipeline branch road is four.
Preferably, the position that sprays into of alkaline absorbent is following single or multiple positions: economizer and scr reactor it
Between, between scr reactor and air preheater, between air preheater and cleaner unit, between cleaner unit and desulfurizing tower.
A kind of coal-fired flue-gas sulfur trioxide removal methods, comprise the steps:
(1) species of the different flue positions of selection, and alkaline absorbent, particle diameter；
(2), during system operation, coarse fodder storehouse stores selected solid particle alkaline absorbent, thick bin bottom and screw rod
Formula batcher is connected, and using screw batcher, absorbent is sent into air classification mill, and absorbent is worn into required fineness, then
Send into standby in fines storehouse；
(3) fines storehouse is connected with loss-in-weight feeders, controls delivery rate using loss-in-weight feeders；
(4) loss-in-weight feeders bottom connects the main pipeline of conveying alkaline absorbent, defeated by the way of air conveying
In feed channel, from the thin alkaline absorbent granule of loss-in-weight feeders, the wind that pressure fan produces first passes through dried-air drier for conveying
It is dried, to prevent absorbent granules water suction from reuniting, blocking pipeline；
(5) the thin absorbent granules of main pipeline first deliver to separator, are divided into multiple branch roads using separator, and each branch road is equal
It is connected with corresponding spray gun, spray gun is evenly arranged in flue cross section, alkaline absorbent granule sprays from spray gun；
(6) arrange static mixer it is ensured that alkaline absorbent granule is uniformly mixed with flue gas in the downstream flue of spray gun；
(7)so3Absorbed by alkaline absorbent granule and form sulfate and be removed, product and unreacted particulate matter
By the particulate matter removing device removing in downstream.
The characteristic based on flue gas for the present invention, is selected different flue positions, is sprayed using this device a certain amount of into flue
And the alkaline absorbent granule of fineness, so3With alkaline absorbent particle reaction and be removed, the granule in flue gas passes through downstream
Particulate removal equipment removes.
Preferably, in step (2), the solid alkaline absorbent granules in coarse fodder storehouse are calcio class alkaline absorbent granule
(cao, ca (oh)2, caco3Deng), magnesio class alkaline absorbent granule (mgo, mg (oh)2, mgco3Magnesium etc.) or sodio class alkalescence
Absorbent granules (na2co3, nahco3, trona etc.)；Described solid alkaline absorbent granules and so in flue gas3Mol ratio be
Between 0.5:1～30:1, in coarse fodder storehouse, the particle diameter of solid alkaline absorbent granules is below 1cm；Air classification mill is by solid base
Property absorbent granules are milled between 10 μm～100 μm, and further, absorbent is milled to 40～60 μm.
Preferably, in step (4), when air conveying, control solid-gas ratio is 0.1～25:1, and flow velocity is 18～30m/s,
Gas pressure is 0.5～1mpa.
Preferably, in step (5), the injection of alkaline absorbent adopts one or more levels to spray, every two-stage injection apparatus
Distance before is 5～15m.
Preferably, the position that alkaline absorbent sprays into includes following single or multiple positions: economizer and scr reactor
Between flue, the flue between scr reactor and air preheater, the flue between air preheater and cleaner unit, cleaner unit and desulfurization
Flue between tower；In different sorbent injection positions, the temperature of flue gas between 100 DEG C～450 DEG C, so3Concentration exist
Between 10ppm～100ppm, the time of staying in flue for the alkaline absorbent is 0.01s～4s.
Flue between economizer and scr reactor, selects injection sodio class absorbent (na2co3, nahco3, natural
Alkali etc.)；Flue between scr reactor and air preheater, selects injection magnesio class absorbent (mgo, mg (oh)2, mgco3Magnesium
Deng)；Flue between air preheater and cleaner unit, and the flue between cleaner unit and desulfurizing tower, select injection calcio class to absorb
Agent (cao, ca (oh)2, caco3Deng).During burning high sulfur coal, in the flue between economizer and scr reactor, spray into alkalescence suction
Receive agent removing so3, reduce so3Harm to catalyst；So when scr catalyst2/so3When conversion ratio is higher, in scr reactor
Alkaline absorbent removing so is sprayed in flue and air preheater between3, reduce the harm generating to air preheater of hydrogen sulfate ammonia；When
Main purpose is to reduce so3Discharge and to during the corrosion of electric power factory equipment, spray into alkalescence in the flue before and after cleaner unit
Absorbent removes so3.
Preferably, described coal-fired flue-gas sulfur trioxide removal methods, comprise the steps:
(1) flue position is located between economizer and scr reactor, 400 DEG C of flue-gas temperature, so3Concentration 25ppm；Natural
As absorbent, trona mean diameter is 2mm to alkali；
(2) during system operation, storing natural alkali in coarse fodder storehouse, thick bin bottom is connected with screw batcher, utilizes
Coarse grained trona is sent into air classification mill by screw batcher, and trona is milled to 40 μm of mean diameter, is re-fed into thin
Standby in feed bin, fines storehouse is sealing device, and is provided with drying device；
(3) fines storehouse is connected with loss-in-weight feeders, using loss-in-weight feeders control delivery rate, reach trona with
so3Mol ratio be 2:1；
(4) loss-in-weight feeders bottom connects the main pipeline of conveying alkaline absorbent, defeated by the way of air conveying
In feed channel, from the thin trona granule of loss-in-weight feeders, the wind that pressure fan produces first passes through dried-air drier and does for conveying
Dry；
(5) the thin trona granule of main pipeline first delivers to separator, is divided into four branch roads using separator, and each branch road is equal
It is connected with corresponding spray gun, spray gun is evenly arranged in flue cross section, alkaline absorbent granule sprays from spray gun, with flue gas forward
Flowing；
(6) arrange static mixer in the downstream flue of spray gun；
(7)so3Absorbed by alkaline absorbent granule and form sulfate and be removed, product and unreacted particulate matter
By the particulate matter removing device removing in downstream.
The beneficial effects of the present invention is:
(1) main pipeline is uniformly divided into multiple branch roads by separator, and each branch road connects a spray gun；Spray gun is evenly arranged in
In flue cross section, and the downstream flue in spray gun installs static mixer it is ensured that the alkaline absorbent of lance ejection is equal with flue gas
Even mixing；
(2) according to different flue gas conditions and flue position, select suitable alkaline absorbent, by removing specific flue
So at position3, effectively prevent the blocking of denitrating catalyst and air preheater, reduce so3The harm that power plant is run, and realize so3
Minimum discharge.
Figure of description
Fig. 1 is coal-fired flue-gas sulfur trioxide removing means structural representation of the present invention；
1- coarse fodder storehouse, 2- screw batcher, 3- air classification mill, 4- fines storehouse, 5- loss-in-weight feeders, 6- air-supply
Machine, 7- dried-air drier, 8- main pipeline, 9- separator, 10- pipeline branch road, 11- spray gun, 12- static mixer, 13- flue.
Specific embodiment
The invention will be further described with specific embodiment below in conjunction with the accompanying drawings, but invention which is intended to be protected is simultaneously
Not limited to this.
Embodiment 1
With reference to Fig. 1, a kind of coal-fired flue-gas sulfur trioxide removing means, including flue 13, described device also includes sequentially phase
The coarse fodder storehouse 1 of connection, screw batcher 2, air classification mill 3, fines storehouse 4, loss-in-weight feeders 5, main pipeline 8, separator 9
With spray gun 11, described spray gun 11 is arranged in flue 13, is disposed with static mixer 12 in the downstream flue of spray gun 11；Described master
Pipeline 8 is connected with pressure fan 6 also by dried-air drier 7.
Described main pipeline 8 is connected with several pipeline branch roads 10 by separator 9, each pipeline branch road respectively with phase
Spray gun 11 is answered to be connected；The quantity of described pipeline branch road is four.Described fines storehouse is sealing device, and fills built with being dried
Put, prevent reunion, fouling, blocking pipeline that alkaline absorbent causes because of water suction etc..
The position that alkaline absorbent sprays into be following single or multiple positions: between economizer and scr reactor, scr anti-
Answer between device and air preheater, between air preheater and cleaner unit, between cleaner unit and desulfurizing tower.During burning high sulfur coal, in economizer
Alkaline absorbent removing so is sprayed in flue and scr reactor between3, reduce so3Harm to catalyst；When scr catalyst
So2/so3When conversion ratio is higher, the flue between scr reactor and air preheater sprays into alkaline absorbent removing so3, subtract
The harm to air preheater for the generation of few hydrogen sulfate ammonia；When main purpose is to reduce so3Discharge and the corruption to electric power factory equipment
During erosion, the flue before and after cleaner unit sprays into alkaline absorbent removing so3.
Embodiment 2
So in flue before removing scr3, flue position is located between economizer and scr reactor.400 DEG C of flue-gas temperature,
so3Concentration 25ppm.According to the flue gas condition at this, select trona (na2co3·nahco3·2h2O) as absorbent, natural
Alkali and so3Mol ratio be 2: 1.Trona coarse fodder mean diameter is 2mm, and fines mean diameter is defined as 40 μm, and alkalescence absorbs
The time of staying in flue for the agent is 2s.
As shown in figure 1, during system operation, storing substantial amounts of trona coarse fodder in coarse fodder storehouse 1, mean diameter is 2mm.Slightly
Feed bin 1 bottom is connected with screw batcher 2；Using screw batcher 2, coarse grained trona is sent into air classification mill
3, trona is milled to 40 μm of mean diameter, is re-fed into standby in fines storehouse 4, fines storehouse is sealing device, and be provided with dry dress
Put, prevent reunion, fouling, blocking pipeline that alkaline absorbent causes because of water suction etc.；Fines storehouse 4 is connected with loss-in-weight feeders 5,
Control delivery rate using loss-in-weight feeders 5, reach trona and so3Mol ratio be 2:1；Loss-in-weight feeders 5 bottom
Connect the main pipeline 8 of conveying absorbent；Main pipeline 8 is conveyed from loss-in-weight feeders 5 by the way of air conveying
Thin trona granule, flow speed control is 22m/s, and gas pressure is 0.8mpa；The wind that pressure fan 6 produces first passes through air drier
7 are dried, to prevent trona particulate water absorbent from reuniting, to block pipeline；The thin trona granule of main pipeline 8 first delivers to separator 9, profit
It is divided into four pipeline branch roads 10 with separator 9, each pipeline branch road is all connected with corresponding spray gun 11；Alkaline absorbent granule is from spray
Rifle 11 sprays, and forward flows with flue gas；In the downstream flue of spray gun, arrangement static mixer 12 is it is ensured that alkaline absorbent and cigarette
Gas uniformly mixes, so in alkaline absorbent granule and flue gas3Form sulfate after reaction and be removed.
It is ensured that so under the conditions of design conditions3Removal efficiency 90%, simultaneously because the trona spraying into accounts for flue gas
Flying dust total amount mass ratio is less than 0.5%, thus without the scr catalyst generation considerable influence to downstream.
Embodiment 3
The present embodiment is to remove so in flue before air preheater with the difference of embodiment 23, it is anti-that flue position is located at scr
Answer between device and air preheater.250 DEG C of flue-gas temperature, so3Concentration 40ppm.According to the flue gas condition at this, select mg (oh)2As
Absorbent, mg (oh)2With so3Mol ratio is 4:1.mg(oh)2Coarse fodder particle diameter is 3mm, and fines mean diameter is defined as 60 μm, alkali
Property the time of staying in flue for the absorbent be 1s.
It is ensured that so under the conditions of design conditions3Removal efficiency 84%.Effectively prevent blocking and the corruption of air preheater
Erosion.
Embodiment 4
The present embodiment is to remove so in front flue of dust collector with the difference of embodiment 23, it is empty that flue position is located at scr
Between pre- device and cleaner unit.150 DEG C of flue-gas temperature, so3Concentration 30ppm.According to the flue gas condition at this, select ca (oh)2As
Absorbent, ca (oh)2With so3Mol ratio is 6:1.ca(oh)2Coarse fodder mean diameter is 4mm, and fines mean diameter is defined as 50 μ
M, the time of staying in flue for the alkaline absorbent is 4s.
It is ensured that so under the conditions of design conditions3Removal efficiency 85%.Effectively prevent cleaner unit and upstream device
Corrosion.
Embodiment 5
The present embodiment is to remove so in flue before desulfurizing tower with the difference of embodiment 23, flue position is removed positioned at scr
Between dirt device and desulfurizing tower.90 DEG C of flue-gas temperature, so3Concentration 15ppm.According to the flue gas condition at this, select ca (oh)2As
Absorbent, ca (oh)2With so3Mol ratio is 3:1.ca(oh)2Coarse fodder mean diameter is 4mm, and fines mean diameter is defined as 40 μ
m.
It is ensured that so under the conditions of design conditions3Removal efficiency 80%.Effectively prevent desulfurizing tower corrosion and can
See the generation of plume.
Claims (10)
1. a kind of coal-fired flue-gas sulfur trioxide removing means, including flue it is characterised in that: described device also includes being sequentially connected
Logical coarse fodder storehouse, screw batcher, air classification mill, fines storehouse, loss-in-weight feeders, main pipeline, separator and spray gun, institute
State spray gun to be arranged in flue, in the downstream flue of spray gun, be disposed with static mixer；Described main pipeline is dried also by air
Machine is connected with pressure fan.
2. coal-fired flue-gas sulfur trioxide removing means according to claim 1 it is characterised in that: described main pipeline pass through point
It is connected with several pipeline branch roads from device, each pipeline branch road is respectively connected with corresponding spray gun.
3. coal-fired flue-gas sulfur trioxide removing means according to claim 2 it is characterised in that: described fines storehouse be sealing
Device, and built with drying device, the quantity of described pipeline branch road is four.
4. coal-fired flue-gas sulfur trioxide removing means according to claim 1 it is characterised in that: alkaline absorbent sprays into
Position is following single or multiple positions: between flue between economizer and scr reactor, scr reactor and air preheater
Flue between flue between flue, air preheater and cleaner unit, cleaner unit and desulfurizing tower.
5. a kind of coal-fired flue-gas sulfur trioxide removal methods it is characterised in that: using claim 1 described device,
Comprise the steps:
(1) species of the different flue positions of selection, and alkaline absorbent, particle diameter；
(2) during system operation, coarse fodder storehouse stores selected solid particle alkaline absorbent, thick bin bottom and screw are given
Material machine is connected, and using screw batcher, absorbent is sent into air classification mill, absorbent is worn into required fineness, is re-fed into
Standby in fines storehouse；
(3) fines storehouse is connected with loss-in-weight feeders, controls delivery rate using loss-in-weight feeders；
(4) loss-in-weight feeders bottom connects the main pipeline of conveying alkaline absorbent, in appendix by the way of air conveying
In road, from the thin alkaline absorbent granule of loss-in-weight feeders, the wind that pressure fan produces first passes through dried-air drier and does for conveying
Dry；
(5) the thin absorbent granules of main pipeline first deliver to separator, are divided into multiple branch roads using separator, each branch road all with phase
Spray gun is answered to be connected, spray gun is evenly arranged in flue cross section, alkaline absorbent granule sprays from spray gun；
(6) arrange static mixer in the downstream flue of spray gun；
(7)so3Absorbed formation sulfate and be removed by alkaline absorbent granule, product and unreacted particulate matter pass through
The particulate matter removing device removing in downstream.
6. coal-fired flue-gas sulfur trioxide removal methods according to claim 5 it is characterised in that: in step (2), coarse fodder storehouse
In solid alkaline absorbent granules be calcio class alkaline absorbent granule, magnesio class alkaline absorbent granule or sodio class alkali
Property absorbent granules；Described solid alkaline absorbent granules and so in flue gas3Mol ratio be 0.5: 1～30: 1 between, coarse fodder
In storehouse, the particle diameter of solid alkaline absorbent granules is below 1cm；Solid alkaline absorbent granules are milled to 10 μm by air classification mill
Between～100 μm.
7. coal-fired flue-gas sulfur trioxide removal methods according to claim 5 it is characterised in that: in step (4), pneumatic transporting
When sending, control solid-gas ratio is 0.1～25:1, and flow velocity is 18～30m/s, and gas pressure is 0.5～1mpa.
8. coal-fired flue-gas sulfur trioxide removal methods according to claim 5 it is characterised in that: in step (5), alkalescence inhale
The injection receiving agent adopts one or more levels to spray, and the distance before every two-stage injection apparatus is 5～15m.
9. coal-fired flue-gas sulfur trioxide removal methods according to claim 5 it is characterised in that: alkaline absorbent sprays into
Position includes following single or multiple positions: between flue between economizer and scr reactor, scr reactor and air preheater
Flue, the flue between air preheater and cleaner unit, the flue between cleaner unit and desulfurizing tower；In different sorbent injection positions
Put, the temperature of flue gas between 100 DEG C～450 DEG C, so3Concentration between 10ppm～100ppm, alkaline absorbent is in flue
In the time of staying be 0.01s～4s.
10. coal-fired flue-gas sulfur trioxide removal methods according to claim 5 are it is characterised in that comprise the steps:
(1) flue position is located between economizer and scr reactor, 400 DEG C of flue-gas temperature, so3Concentration 25ppm；Trona conduct
Absorbent, trona mean diameter is 2mm；
(2) during system operation, storing natural alkali in coarse fodder storehouse, thick bin bottom is connected with screw batcher, using screw rod
Coarse grained trona is sent into air classification mill by formula batcher, trona is milled to 40 μm of mean diameter, is re-fed into fines storehouse
In standby, fines storehouse is sealing device, and is provided with drying device；
(3) fines storehouse is connected with loss-in-weight feeders, controls delivery rate using loss-in-weight feeders, reaches trona and so3's
Mol ratio is 2:1；
(4) loss-in-weight feeders bottom connects the main pipeline of conveying alkaline absorbent, in appendix by the way of air conveying
In road, from the thin trona granule of loss-in-weight feeders, the wind that pressure fan produces first passes through dried-air drier and is dried for conveying；
(5) the thin trona granule of main pipeline first delivers to separator, is divided into four branch roads using separator, each branch road all with phase
Spray gun is answered to be connected, spray gun is evenly arranged in flue cross section, alkaline absorbent granule sprays from spray gun, forward flows with flue gas
Dynamic；
(6) arrange static mixer in the downstream flue of spray gun；
(7)so3Absorbed formation sulfate and be removed by alkaline absorbent granule, product and unreacted particulate matter pass through
The particulate matter removing device removing in downstream.
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| CN112495176A (en) * | 2020-11-04 | 2021-03-16 | 江苏垦乐节能环保科技有限公司 | Semi-dry desulfurization synergistic device and implementation method thereof |
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| CN112742186A (en) * | 2020-11-10 | 2021-05-04 | 华电电力科学研究院有限公司 | Method for removing sulfur trioxide in flue gas by spraying magnesium hydroxide |
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