CN108671715A - A kind of coal-fired flue-gas sulfur trioxide removing means and its application method and application - Google Patents
A kind of coal-fired flue-gas sulfur trioxide removing means and its application method and application Download PDFInfo
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- CN108671715A CN108671715A CN201810446059.1A CN201810446059A CN108671715A CN 108671715 A CN108671715 A CN 108671715A CN 201810446059 A CN201810446059 A CN 201810446059A CN 108671715 A CN108671715 A CN 108671715A
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- trona
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- coal
- pipeline
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- AKEJUJNQAAGONA-UHFFFAOYSA-N sulfur trioxide Chemical compound O=S(=O)=O AKEJUJNQAAGONA-UHFFFAOYSA-N 0.000 title claims abstract description 64
- 239000003546 flue gas Substances 0.000 title claims abstract description 44
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 26
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims abstract description 128
- 241001625808 Trona Species 0.000 claims abstract description 120
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 51
- 230000023556 desulfurization Effects 0.000 claims abstract description 47
- 239000003517 fume Substances 0.000 claims abstract description 44
- 238000002347 injection Methods 0.000 claims abstract description 28
- 239000007924 injection Substances 0.000 claims abstract description 28
- 239000000779 smoke Substances 0.000 claims abstract description 23
- 239000012530 fluid Substances 0.000 claims abstract description 21
- 238000005262 decarbonization Methods 0.000 claims abstract description 11
- 230000003009 desulfurizing effect Effects 0.000 claims abstract description 5
- 239000007789 gas Substances 0.000 claims description 78
- 239000000843 powder Substances 0.000 claims description 31
- 238000005452 bending Methods 0.000 claims description 13
- 230000007704 transition Effects 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 12
- 239000007921 spray Substances 0.000 claims description 8
- 230000000694 effects Effects 0.000 claims description 7
- CNKHSLKYRMDDNQ-UHFFFAOYSA-N halofenozide Chemical compound C=1C=CC=CC=1C(=O)N(C(C)(C)C)NC(=O)C1=CC=C(Cl)C=C1 CNKHSLKYRMDDNQ-UHFFFAOYSA-N 0.000 claims description 3
- 235000012054 meals Nutrition 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 239000003344 environmental pollutant Substances 0.000 abstract description 7
- 231100000719 pollutant Toxicity 0.000 abstract description 7
- 239000012717 electrostatic precipitator Substances 0.000 abstract description 6
- 238000005260 corrosion Methods 0.000 abstract description 4
- 230000007797 corrosion Effects 0.000 abstract description 4
- 239000004071 soot Substances 0.000 abstract description 2
- 230000000903 blocking effect Effects 0.000 abstract 1
- 230000009257 reactivity Effects 0.000 abstract 1
- 239000003463 adsorbent Substances 0.000 description 23
- UIIMBOGNXHQVGW-UHFFFAOYSA-M sodium bicarbonate Substances [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 15
- 239000002585 base Substances 0.000 description 14
- 239000002245 particle Substances 0.000 description 11
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 10
- 238000006243 chemical reaction Methods 0.000 description 9
- 235000019504 cigarettes Nutrition 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 239000011734 sodium Substances 0.000 description 5
- 229910000029 sodium carbonate Inorganic materials 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000000428 dust Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000003513 alkali Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000005864 Sulphur Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 229910001748 carbonate mineral Inorganic materials 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- FKLFBQCQQYDUAM-UHFFFAOYSA-N fenpiclonil Chemical compound ClC1=CC=CC(C=2C(=CNC=2)C#N)=C1Cl FKLFBQCQQYDUAM-UHFFFAOYSA-N 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 229910052815 sulfur oxide Inorganic materials 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 1
- 241001062009 Indigofera Species 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- -1 desulfurizing tower Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005367 electrostatic precipitation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000002779 inactivation Effects 0.000 description 1
- 206010022000 influenza Diseases 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000002594 sorbent Substances 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 230000007306 turnover Effects 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
-
- 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
- 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
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8631—Processes 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
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/90—Injecting 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Treating Waste Gases (AREA)
Abstract
A kind of coal-fired flue-gas sulfur trioxide removing means and its application method and application, belong to power plant soot fume pollutant control field.Described device includes the boiler back end ductwork of main pipeline connection successively, SCR denitration reactor, quenched trona swirl injection device, air preheater, electrostatic precipitator, desulfurizing tower, bag filter, decarbonization device and chimney, described device further includes that desulfurization fume bypass duct and collision type fluid bed trona crush modifying device, the desulfurization fume bypass duct is set to bag filter into nozzle, main pipeline bottom between decarbonization device, the desulfurization fume bypass duct is divided into two, pipeline crushes modifying device with collision type fluid bed trona and connects all the way, another way pipeline connects with smoke inlet.The present invention can be quenched to trona progress using Desulphurization for Coal-fired Power Plant flue gas, improves the reactivity of trona, effectively removes the SO in coal-fired flue-gas3, alleviate boiler flue corrosion, air preheater blocking and " Lan Yu " phenomenon.
Description
Technical field
The invention belongs to power plant soot fume pollutant control field, more particularly to a kind of coal-fired flue-gas sulfur trioxide removing
Device and its application method and application.
Background technology
SO3It is a kind of important pollutant of coal-burning power plant's discharge.On the one hand, the SO in flue gas3With H2O reactions generate
H2SO4, flue gas acid dew point is made to increase and induce flue and equipment low-temperature corrosion；Meanwhile SO3It can be at selective catalytic reduction (SCR)
In Benitration reactor with NH3、H2The reactions such as O generate NH4HSO4Equal emplastics cause catalyst inactivation and air downstream to preheat
Device (APH) blocks, and threat is generated to the safe operation of power plant.On the other hand, it is discharged into the SO of environment3、H2SO4, both generate indigo plant
Color or yellow plume phenomenon, and meeting weighting particles object and acid deposition, cause environmental pollution, have an adverse effect to health.
With《Fossil-fuel power plant atmospheric pollutant emission standard》(GB13223-2011) issuing and implementation, China are big to thermal power plant
Gas pollutant emission standard has carried out stringenter limitation, and the concentration of emission limiting value of SOx is 50mg/m3(key area).
Meanwhile the ground such as Jiangsu Province, Zhejiang Province, Shaanxi Province, Guangzhou propose coal-burning power plant's pollutant " minimum discharge " requirement in succession, that is, fire
The pollutant emission of unit reaches the ultra-clean discharge standard of fuel gas generation, the discharge limit of wherein SOx after coal-fired plant creates or is transformed
Value is only 35mg/m3, at this point, SO3The contribution of discharge capacity then becomes relatively large.Therefore, SO is controlled3Concentration of emission, solve by
In SO3It is imperative to discharge the problem of environmental pollution brought.
To alleviate and eliminating SO3Influence, industry proposes many SO3Control technology, alkaline matter is sprayed into flue
Remove SO3It is proved to be a kind of effective method.Common desulfurization alkaline adsorbent has Ca-base adsorbent and the absorption of sodium base
Agent.Ca-base adsorbent is widely used, and when stoichiometric ratio is suitable, desulfuration efficiency can reach 90%.But it is mainly asked existing for it
Topic one is that adsorbent utilization rate is low, second is that in the case where the quantity for spraying into adsorbent is excessive, can greatly increase the ratio electricity of flying dust
Resistance, reduces the working efficiency of electrostatic precipitator.Sodium base adsorbent has higher reaction to live under the same conditions, than Ca-base adsorbent
Property and problem caused by Ca-base adsorbent is avoided, studies have shown that under the same conditions, NaHCO3Compare Na2CO3With higher
Desulfuration efficiency and adsorbent utilization rate, but NaHCO3Price is Ca (OH)23~4 times, cost factor limits NaHCO3's
Using.
Trona is a kind of natural carbonate mineral.There is abundant trona resource in China, oneself is through proved reserves more than 200,000,000
Ton, prospective reserves 3~500,000,000 ton, and possess Asia first, the second in the world large-scale natural alkali mine, this for trona injection removing
SO3Commercial Application of the technology in China provides advantageous advantage.And trona is a kind of natural materials, with Ca (OH)2Valence
Lattice are suitable.But trona has that utilization rate is low as adsorbent.Based on CO2It can be with the Na contained by trona2CO3Instead
It answers, trona is converted into NaHCO3The fact, trona hardening and tempering process has great foreground and potentiality.
Chinese patent CN103055684A propose a kind of device effectively removing sulfur trioxide in flue gas using trona and
The adsorbent of technique, injection is trona slurries, and this method belongs to wet sorbent injection technique, although this method removal efficiency is very
Height, but the low dosage of trona utilization rate is big, increases using difficulty and cost.
Invention content
The technical issues of solution：In view of the above technical problems, the present invention provides a kind of coal-fired flue-gas sulfur trioxide removing dress
It sets and its application method and application, can effectively remove the SO in coal-fired flue-gas3, alleviate boiler flue corrosion, air preheater blocks
" Lan Yu " phenomenon.
Technical solution：A kind of coal-fired flue-gas sulfur trioxide removing means, described device include the pot of main pipeline connection successively
Stove back-end ductwork, SCR denitration reactor, quenched trona swirl injection device, air preheater, electrostatic precipitator, desulfurizing tower, cloth
Bag dust collector, decarbonization device and chimney, the quenched trona swirl injection device include smoke inlet, bending transition flue duct, rotation
Flow nozzle group and exhanst gas outlet, the smoke inlet and exhanst gas outlet are set to the both sides of bending transition flue duct, the smoke inlet
Connect with SCR denitration reactor, the exhanst gas outlet connects with air preheater, and the swirl nozzle is mounted on bending transition cigarette
Inside road horizontal segment, the swirl nozzle group injection direction is consistent with flow of flue gas direction, and the swirl nozzle group includes at least
Three groups of nozzles being vertically arranged, every group of nozzle set gradually 5 main burners from top to bottom, are set on each main burner there are two small spray
Mouth；
Described device further includes desulfurization fume bypass duct and collision type fluid bed trona crushes modifying device, described de-
Sulphur gas bypass pipeline is set to the main pipeline bottom between bag filter, decarbonization device, the desulfurization fume bypass into nozzle
Pipeline is divided into two, and pipeline crushes modifying device with collision type fluid bed trona and connects all the way, and another way pipeline enters with flue gas
Mouth connects；
It includes trona feed inlet, double flap valves, feed bin, high material that the collision type fluid bed trona, which crushes modifying device,
Position display, low material position display, engine base, scroll feeder, at least two Laval nozzles, air inlet, gas mill room, trona
Discharge port and turbine powder concentrator, the trona feed inlet are connected by double flap valves with feed bin entrance, and high charge level display is set
In feed bin side wall upper part, low material position display is set to feed bin lower sidewall, and described scroll feeder one end connects with feed bin bottom end,
The other end connects with gas mill room bottom end feed inlet, and the engine base is set to the gentle mill room bottom of feed bin, and the Laval nozzle is with gas
It is vertical substantially symmetrical about its central axis and horizontal set on gas mill room bottom margin to grind room, and the Laval nozzle pipeline connects and positioned at same
One horizontal plane, the air inlet are located therein a Laval nozzle top, and the turbine powder concentrator level is set to gas and grinds ceiling
Portion, the trona discharge port connect with turbine powder concentrator horizontal side meal outlet, the air inlet with from desulfurization fume shunt valve
The pipeline all the way that road separates connects, and the trona discharge port is connect with swirl nozzle group pipeline.
Preferably, described device further includes flowmeter a, gas boosting pump a, pressure gauge a and shut-off valve a, the flow
It counts a, gas boosting pump a, pressure gauge a and shut-off valve a is sequentially connected to desulfurization fume bypass duct and collision type fluid bed is natural
Between the pipeline all the way that the broken modifying device of ground caustic connects.
Preferably, described device further includes flowmeter b, gas boosting pump b, pressure gauge b and shut-off valve b, the flow
Meter b, gas boosting pump b, pressure gauge b and shut-off valve b be sequentially connected to desulfurization fume bypass duct connect with smoke inlet it is another
All the way between pipeline.
Preferably, described device further includes SO3Concentration detector, the SO3Concentration detector is reacted set on SCR denitration
Between the pipeline that device and quenched trona swirl injection device connect.
Preferably, two small in the main burner on two groups of nozzles of flue vertical walls in the swirl nozzle group
Nozzle angle is set as being in using horizontal plane as axis, counterclockwise 35 ° or 345 °, two small nozzles in the main burner in remaining nozzle sets
Angle is set as being in using horizontal plane as axis, counterclockwise 45 ° or 315 °.
Another technical solution of the present invention is the application method of described device, be the described method comprises the following steps：By day
Right alkali is sent into feed bin from trona feed inlet；Then gas is sent by scroll feeder and grinds room, it will be in desulfurization fume bypass duct
The desulfurization fume all the way separated is sent into air inlet；Trona after crushing enters turbine powder concentrator, and turbine powder concentrator is low by grain size
It is sent into swirl nozzle group in 10 μm of fine powders, under the action of the another way desulfurization fume separated from desulfurization fume bypass duct
Be sent into smoke inlet, trona in swirl nozzle group sprayed from exhanst gas outlet, to quenched trona swirl injection device and
Coal-fired flue-gas carries out SO in pipeline between air preheater3Removing.
Preferably, the pressure of the air inlet gas is more than 0.7MPa, Mach 2 ship 1.4~2.5, nozzle back pressure is
88.54kPa~64.88kPa.
Application of the device of the present invention in coal-fired flue-gas removes sulfur trioxide.
Advantageous effect：1. the present invention selects the lower trona of rich reserves, price as removing SO3Adsorbent, both
Avoid Ca-base adsorbent utilization ratio it is low and when straying quatity is excessive increase flying dust specific resistance, reduce the work of electrostatic precipitator
The problem of making efficiency, and the utilization channel of trona resource can be widened.
2. the present invention rationally and effectively utilizes the CO in neat stress after desulfurization2With the quenched trona of vapor, by trona
In Na2CO3To NaHCO3Conversion, it is in porous structure to make adsorbent, increases response area, and then quenched product is sprayed into flue
Realize SO in coal-fired flue-gas3Removing, SO can be improved3Removal efficiency, solve trona slurries desulfurization technology in utilization rate it is low
The problem of, and adsorbent use cost can be reduced.
3. the present invention is modified integrated technique using fluid bed airflow milling-surface, trona particle not only may be implemented
The quenched of trona is completed while ultra-fine grinding, and it is independent effectively to overcome air-flow crushing and surface to be modified two kinds of techniques
CO when effect2It is poor with trona surface compatibility, react the shortcomings of uneven；Energy consumption can be reduced again simultaneously, improve production efficiency.
4. adsorbent is uniformly sprayed into the spray of gas approach inner nozzle by multiple nozzles by the present invention using swirling jet unit
It penetrates that direction is consistent with flow of flue gas direction, improves residence time of the adsorbent in flue, make removal effect more preferably.
5. the present invention is smaller to the change of boiler original flue, the flowing and processing of original boiler smoke, improvement cost are not influenced
It is relatively low.
Description of the drawings
Fig. 1 is the coal-fired flue-gas sulfur trioxide removing means process flow chart；
Fig. 2 is that the collision type fluid bed trona crushes modifying device structural schematic diagram；
Fig. 3 is quenched trona swirl injection device structural schematic diagram；
Fig. 4 is that schematic diagram is arranged in alkaline adsorbent spraying system swirl nozzle angle；
Fig. 5 is the Laval nozzle diagrammatic cross-section of the present invention；
Fig. 6 is Gambit flues mesh generation schematic diagram in embodiment 2；
Fig. 7 is 2 mesospore face velocity polar plot of embodiment；
Fig. 8 is wall surface Temperature Distribution cloud atlas in embodiment 2；
Fig. 9 is particle motion trajectory figure in embodiment 2.
Each number designation represents as follows in figure：1. boiler；2.SCR Benitration reactors；3. air preheater；4. electrostatic precipitation
Device；5. desulfurizing tower；6. bag filter；7. decarbonization device；8. chimney；9. desulfurization fume bypass duct；10. flowmeter a；11.
Gas boosting pumps a；12. collision type fluid bed trona crushes modifying device；12-1. trona feed inlet；12-2. double turnover panels
Valve；12-3. high charge level display；The low material position displays of 12-4.；12-5. engine bases；12-6. scroll feeders；The Lavalles 12-7.
Nozzle；12-8. air inlets；12-9. gas grinds room；12-10. trona discharge port；12-11. turbine powder concentrator；13. pressure gauge a；
14. shut-off valve a；15. flowmeter b；16. gas boosting pumps b；17. pressure gauge b；18. shut-off valve b；19.SO3Concentration detector；
20. quenched trona swirl injection device；20-1. smoke inlets；20-2. swirl nozzle group；20-3. exhanst gas outlets.
Specific implementation mode
The invention will be further described in the following with reference to the drawings and specific embodiments.
Embodiment 1
A kind of coal-fired flue-gas sulfur trioxide removing means, described device include the 1 tail portion cigarette of boiler of main pipeline connection successively
Road, SCR denitration reactor 2, quenched trona swirl injection device 20, air preheater 3, electrostatic precipitator 4, desulfurizing tower 5, cloth bag
Deduster 6, decarbonization device 7 and chimney 8, the quenched trona swirl injection device 20 include smoke inlet 20-1, bending transition
Flue, swirl nozzle group 20-2 and exhanst gas outlet 20-3, the smoke inlet 20-1 and exhanst gas outlet 20-3 are set to bending transition
The both sides of flue, the smoke inlet 20-1 connect with SCR denitration reactor 2, the exhanst gas outlet 20-3 and air preheater 3
Connect, the swirl nozzle group 20-2 is set to inside bending transition flue duct horizontal segment, the swirl nozzle group 20-2 injection directions
Consistent with flow of flue gas direction, the swirl nozzle group 20-2 includes 5 groups of nozzles being vertically arranged, every group of nozzle from top to bottom according to
5 main burners of secondary setting, set that there are two small nozzles on each main burner.
Described device further includes that desulfurization fume bypass duct 9 and collision type fluid bed trona crush modifying device 12, institute
It states desulfurization fume bypass duct 9 and is set to the main pipeline bottom between bag filter 6, decarbonization device 7, the desulfurization cigarette into nozzle
Gas bypass duct 9 is divided into two, and pipeline and collision type fluid bed trona crush modifying device 12 and connects all the way, all the way pipeline with
Smoke inlet 20-1 connects.
It includes trona feed inlet 12-1, double flap valve 12- that the collision type fluid bed trona, which crushes modifying device 12,
2, feed bin, high charge level display 12-3, low material position display 12-4, engine base 12-5, scroll feeder 12-6, four Lavalle sprays
Mouth 12-7, air inlet 12-8, gas mill room 12-9, trona discharge port 12-10 and turbine powder concentrator 12-11, the trona into
Material mouth 12-1 is connected by double flap valve 12-2 with feed bin entrance, and high charge level display 12-3 is set to feed bin side wall upper part, low material
Position display 12-4 is set to feed bin lower sidewall, and the one end the scroll feeder 12-6 connects with feed bin bottom end, the other end and gas
The mill room bottom ends 12-9 feed inlet connects, and the engine base 12-5 is set to the gentle mill room bottoms 12-9 of feed bin, the Laval nozzle 12-
7 is vertical substantially symmetrical about its central axis and the horizontal gas that is set to grinds room 12-9 bottom margins, and the Laval nozzle pipe with gas mill room 12-9
Road connects and is located at same level, and the air inlet 12-8 is located therein a Laval nozzle top, and the turbine selects powder
Machine 12-11 levels are set at the top of gas mill room 12-9, and the trona discharge port 12-10 goes out with turbine powder concentrator 12-11 horizontal sides
Powder mouth is connected, and the air inlet 12-8 is connect with the pipeline all the way separated from desulfurization fume bypass duct 9, the trona discharging
Mouth 12-10 is connect with swirl nozzle group 20-2 pipelines.
The application method of the coal-fired flue-gas sulfur trioxide removing means, the described method comprises the following steps：By trona
It is sent into feed bin from trona feed inlet 12-1；Then gas is sent by scroll feeder 12-6 and grinds room 12-9, by desulfurization fume
The desulfurization fume all the way separated in road pipeline 9 is sent into air inlet 12-8, and the pressure of setting air inlet 12-8 is more than 0.7MPa, Mach
Number is 1.4~2.5, and nozzle back pressure is 88.54kPa~64.88kPa；Trona after crushing enters turbine powder concentrator 12-11,
Fine powders of the turbine powder concentrator 12-11 by grain size less than 10 μm is sent into swirl nozzle group 20-2, from desulfurization fume bypass duct 9
Smoke inlet 20-1 is sent under the action of the another way desulfurization fume separated, the trona by grain size less than 10 μm is from exhanst gas outlet
20-3 sprays, and coal-fired flue-gas carries out SO in the pipeline between quenched trona swirl injection device 20 and air preheater 33It is de-
It removes.
Embodiment 2
A kind of coal-fired flue-gas sulfur trioxide removing means, referring to Fig.1, described device include the boiler of main pipeline connection successively
1 back-end ductwork, SCR denitration reactor 2, quenched trona swirl injection device 20, air preheater 3, electrostatic precipitator 4, desulfurization
Tower 5, bag filter 6, decarbonization device 7 and chimney 8, with reference to Fig. 3, the quenched trona swirl injection device 20 enters including flue gas
Mouth 20-1, bending transition flue duct, swirl nozzle group 20-2 and exhanst gas outlet 20-3, the smoke inlet 20-1 and exhanst gas outlet
20-3 is set to the both sides of bending transition flue duct, and the smoke inlet 20-1 connects with SCR denitration reactor 2, the exhanst gas outlet
20-3 connects with air preheater 3, and the swirl nozzle group 20-2 is set to inside bending transition flue duct horizontal segment, the eddy flow spray
Mouth group 20-2 injection directions are consistent with flow of flue gas direction.With reference to Fig. 3 and Fig. 4, the nozzle uses and is injected tangentially formula nozzle, powder
Dirt accelerates into spin chamber's high speed rotation by least two tangential inlets, is finally sprayed via nozzle.Bending transition flue duct and
The caliber of main pipeline is identical, is 8900mm, and 9 caliber of desulfurization fume bypass duct is 3650mm, and desulfurization fume bypass duct 9 divides
The caliber of the two-way pipeline gone out is identical, is 1500mm.
The swirl nozzle group 20-2 includes 9 groups of nozzles being vertically arranged, and every group of nozzle sets gradually 5 masters from top to bottom
Nozzle, sets that there are two small nozzles on each main burner.The right and left main burner group is away from flue inner wall 890mm, adjacent main burner group
5 small nozzles are arranged in each main burner group by spacing 900mm, a diameter of 300mm of main burner, and upper and lower narrowing toward each end nozzle is away from upper
The distance of lower wall surface is 450mm, and the distance of adjacent small nozzle is 500mm, a diameter of 150mm of small nozzle.The swirl nozzle
In group 20-2 in the main burner on two groups of nozzles of flue vertical walls two small nozzle angles be set as be with horizontal plane
Axis is in 35 ° or 345 ° counterclockwise, in the main burner in remaining nozzle sets two small nozzle angles be set as using horizontal plane as axis,
It is in 45 ° or 315 ° counterclockwise.
Described device further includes that desulfurization fume bypass duct 9 and collision type fluid bed trona crush modifying device 12, institute
It states desulfurization fume bypass duct 9 and is set to the main pipeline bottom between bag filter 6, decarbonization device 7, the desulfurization cigarette into nozzle
Gas bypass duct 9 is divided into two, and pipeline crushes modifying device 12 with collision type fluid bed trona and connects all the way, another way pipeline
Connect with smoke inlet 20-1.Described device further includes flowmeter a 10, gas boosting pump a 11, pressure gauge a 13 and shut-off valve
A 14, the flowmeter a 10, gas boosting pump a 11, pressure gauge a 13 and shut-off valve a 14 are sequentially connected to by desulfurization fume
Road pipeline 9 is crushed with collision type fluid bed trona between the pipeline all the way that modifying device 12 connects.Described device further includes stream
Gauge b 15, gas boosting pump b 16, pressure gauge b 17 and shut-off valve b 18, the flowmeter b 15, gas boosting pumps b 16,
Pressure gauge b 17 and shut-off valve b 18 is sequentially connected to the another way pipe that desulfurization fume bypass duct 9 connects with smoke inlet 20-1
Between road.Described device further includes SO3Concentration detector 19, the SO3Concentration detector 19 is set to SCR denitration reactor 2 and adjusts
Between the pipeline that matter trona swirl injection device 20 connects, the SO3Concentration detector 19 monitors SCR denitration reactor 2 in real time
SO in flue between air preheater 33Concentration adjusts the injection of the quenched trona of swirl nozzle group according to surveyed concentration
Amount.
With reference to Fig. 2, the collision type fluid bed trona crushes modifying device 12 and includes trona feed inlet 12-1, double turns over
Plate valve 12-2, feed bin, high charge level display 12-3, low material position display 12-4, engine base 12-5, scroll feeder 12-6, Bearing score
Your nozzle 12-7, air inlet 12-8, gas mill room 12-9, trona discharge port 12-10 and turbine powder concentrator 12-11, it is described natural
Alkali feed inlet 12-1 is connected by double flap valve 12-2 with feed bin entrance, and high charge level display 12-3 is set to feed bin side wall upper part,
Low material position display 12-4 is set to feed bin lower sidewall, and the one end the scroll feeder 12-6 connects with feed bin bottom end, the other end
Connect with the gas mill room bottom ends 12-9 feed inlet, the engine base 12-5 is set to the gentle mill room bottoms 12-9 of feed bin.Reference Fig. 2 and Fig. 5,
The Laval nozzle 12-7 is vertical substantially symmetrical about its central axis and horizontal set on gas mill room 12-9 bottom margins with gas mill room 12-9, and
The Laval nozzle pipeline connects and is located at same level, and the air inlet 12-8 is located therein a Laval nozzle top
End, the turbine powder concentrator 12-11 levels are set at the top of gas mill room 12-9, and the trona discharge port 12-10 is selected set on turbine
Powder machine 12-11 horizontal side meal outlets connect, the air inlet 12-8 and the pipeline phase all the way separated from desulfurization fume bypass duct 9
It connects, the trona discharge port 12-10 is connect with swirl nozzle group 20-2 pipelines.
Trona (the Na2CO3·NaHCO3·2H2O) it is aqueous carbonate mineral, is a kind of white easy to moisture absorption
Crystalline powder, CO2It can be with the Na in the trona2CO3Reaction, converts trona to NaHCO3.Into by desulfurization fume
The main component of the desulfurization neat stress of road pipeline 9 is N2(62~80vt.%), CO2(10~15vt.%), O2(5~8vt.%)
With water (5~15vt.%), temperature is 50~70 DEG C.
The application method of the coal-fired flue-gas sulfur trioxide removing means, the described method comprises the following steps：By trona
It is sent into feed bin from trona feed inlet 12-1；Then quenched by scroll feeder 12-6 feeding gas mill room 12-9 progress, it will take off
The desulfurization fume all the way separated in sulphur gas bypass pipeline 9 is by the meterings of flowmeter a 10, gas boosting pump a 11 pressurizations, pressure
Table a 13 monitors pressure and shut-off valve a 14 is sent into air inlet 12-8, and the pressure of setting air inlet 12-8 gases is more than 0.7MPa,
Mach 2 ship 1.4~2.5, nozzle back pressure is 88.54kPa~64.88kPa, from the high pressure draught that air inlet 12-8 comes in from peace
Enter gas in conplane four Laval nozzles of cavity wall and grinds room 12-9, the high pressure draught that four Laval nozzles spray
Beam and the trona particles hit are able to crush trona particle, at the same time contain CO2Desulfurization fume with vapor will
Na in trona2CO3To NaHCO3Conversion, forms one upward air-flow around joint, the trona of crushing is brought into
Turbine powder concentrator 12-11；Trona after crushing enters turbine powder concentrator 12-11, turbine powder concentrator 12-11 and grain size is less than 10
μm fine powder be sent into swirl nozzle group 20-2 from trona discharge port 12-10, the coarse powder not up to required returns to gas mill room 12-9
Continue to crush；Increase by the meterings of flowmeter b 15, gas in the another way desulfurization fume separated from desulfurization fume bypass duct 9
The pressurizations of press pump b 16, pressure gauge b 17 monitor pressure and shut-off valve b 18 is sent into smoke inlet 20-1, by grain size less than 10 μm
Trona is sprayed from exhanst gas outlet 20-3, to the pipeline internal combustion between quenched trona swirl injection device 20 and air preheater 3
Flue-gas carries out SO3Removing.
Each component content is in trona：Na2CO3, 50wt.%；NaHCO3, 10wt.%；H2O, 40wt.%.By this
In device collision type fluid bed trona crushing arrange device it is quenched after quenched trona each component content be：Na2CO3,
20wt.%；NaHCO3, 40wt.%；H2O, 40wt.%.And quenched trona and SO3Reaction molar ratio be 9：1.
Embodiment 3
Using the device in embodiment 2, using Fluent softwares to quenched trona fine particle in SCR denitration reactor
Flue motion conditions between 2 and air preheater 3 carry out analogue simulation.
(1) geometrical model
SCR back-end ductworks are carried out to simplify processing, one segment length of interception is 12825mm, width 8900mm, height 2900mm
Cuboid flue as three-dimensional model.With the method for arranging of quenched trona swirl injection device 20 in embodiment 2, in conjunction with
Gambit softwares model the three-dimensional model.Modeling result is as shown in Figure 6.Wherein, entrance velocity boundary condition is nozzle
With flue entrance wall surface, outlet pressure boundary condition is exhanst gas outlet wall surface, remaining is all default standard wall surface.
(2) physical model
Main models are summarized as follows：1) SCR tail flue gas mobility status in flue；2) quenched trona air source and former cigarette
Gas Coupled Flow situation；3) trona fine grained movement locus in complex wake.
Therefore, this simulation process chooses gas phase turbulance model and Discrete Phase Model carries out analog approach.
In simulation process, following approximating assumption is carried out：A) ignore the influence of flying dust；B) inlet flue gas flow velocity is uniform；c)
Flowing is Steady Flow；D) flue gas each component gas is ideal Incompressible gas；E) ignore the phase between absorbent particles
Interaction.
Parameter setting：Determine that inlet flue gas flow velocity is 4.22m/s, temperature 573K.Take quenched trona and SO3Molar ratio is
9：1, discrete phase mass velocity 0.032kg/s, particle diameter distribution takes 10 μm of single particle size to be calculated.Through consulting literatures, adjust
The mode of movement of matter trona is diluted phase transport, therefore sets nozzle entrance flow velocity as 20m/s, temperature 320K, trona particle
Density 2.532g/cm3。
It is as shown in Figure 7 to export gas phase turbulance speed flowing field.As seen from Figure 7, speed is larger early period, and turbulent extent is acute
Strong, the later stage is gradually gentle.
It is as shown in Figure 8 to export gas phase turbulance speed flowing field.As seen from Figure 8, minimum about close to outlet temperature
200 DEG C, it is higher than SO3Close dew temperature, avoid flue and equipment low-temperature corrosion.
On the basis of having flow field, setting nozzle is injection source, and export 10 μm of trona powder of grain size move in stream
Track is as shown in Figure 9.As seen from Figure 9, it is more intensive to spray particle early period, the entire flow field of later stage gradual uniformly dispersing.It is whole
From the point of view of body trend, particle tracing ability is fine, gas can be followed to travel forward, and will not be deposited on flue inner wall.
Meanwhile increasing by two groups of comparative examples, comparative example 1 takes grain size to be more than 10 μm, remaining parameter constant；2 adsorbent of comparative example
For trona, remaining parameter constant.
The different adsorbent adsorption effect of three groups of parameters is shown in Table 1.
The different adsorbent adsorption effect of 1 three groups of parameters of table
As can be seen from the above table, when grain size is identical, the utilization rate and removal efficiency of quenched trona are above trona；
When adsorbent is quenched trona, adsorbent grain size is smaller, and chemical reaction rate is faster, and adsorption effect is more preferable.This implementation
It is quenched to trona progress by quenched trona swirl injection device 20 in example, the grain size of trona is adjusted while quenched
Whole, middle trona utilization rate is 40% compared to the prior art, and the utilization rate of quenched trona is up to 65% in the application, than existing
Have and improve 25% in technology, while also to SO in coal-fired flue-gas3Reaction rate and removal efficiency promoted.
Claims (8)
1. a kind of coal-fired flue-gas sulfur trioxide removing means, which is characterized in that described device includes the pot of main pipeline connection successively
Stove（1）Back-end ductwork, SCR denitration reactor（2）, quenched trona swirl injection device（20）, air preheater（3）, electrostatic removes
Dirt device（4）, desulfurizing tower（5）, bag filter（6）, decarbonization device（7）And chimney（8）, the quenched trona swirl injection device
（20）Including smoke inlet（20-1）, bending transition flue duct, swirl nozzle group（20-2）And exhanst gas outlet（20-3）, the flue gas
Entrance（20-1）And exhanst gas outlet（20-3）Set on the both sides of bending transition flue duct, the smoke inlet（20-1）With SCR denitration
Reactor（2）Connect, the exhanst gas outlet（20-3）With air preheater（3）Connect, the swirl nozzle group（20-2）It is set to
Inside bending transition flue duct horizontal segment, the swirl nozzle group（20-2）Injection direction is consistent with flow of flue gas direction, the rotation
Flow nozzle group（20-2）Including at least three groups of nozzles being vertically arranged, every group of nozzle sets gradually 5 main burners from top to bottom, often
Small nozzle there are two being set on a main burner；
Described device further includes desulfurization fume bypass duct（9）Modifying device is crushed with collision type fluid bed trona（12）, institute
State desulfurization fume bypass duct（9）It is set to bag filter into nozzle（6）, decarbonization device（7）Between main pipeline bottom, it is described
Desulfurization fume bypass duct（9）It is divided into two, pipeline crushes modifying device with collision type fluid bed trona all the way（12）Connect,
Another way pipeline and smoke inlet（20-1）Connect；
The collision type fluid bed trona crushes modifying device（12）Including trona feed inlet（12-1）, double flap valves（12-
2）, feed bin, high charge level display（12-3）, low material position display（12-4）, engine base（12-5）, scroll feeder（12-6）, extremely
Few two Laval nozzles（12-7）, air inlet（12-8）, gas grind room（12-9）, trona discharge port（12-10）It is selected with turbine
Powder machine（12-11）, the trona feed inlet（12-1）Pass through double flap valves（12-2）Connect with feed bin entrance, high charge level is shown
Device（12-3）Set on feed bin side wall upper part, low material position display（12-4）Set on feed bin lower sidewall, the scroll feeder
（12-6）One end connects with feed bin bottom end, and the other end grinds room with gas（12-9）Bottom end feed inlet connects, the engine base（12-5）If
In the gentle mill room of feed bin（12-9）Bottom, the Laval nozzle（12-7）Room is ground with gas（12-9）Vertical substantially symmetrical about its central axis and water
The flat gas that is set to grinds room（12-9）Bottom margin, and the Laval nozzle pipeline connection and be located at same level, it is described into
Gas port（12-8）It is located therein a Laval nozzle top, the turbine powder concentrator（12-11）Level is set to gas and grinds room（12-
9）Top, the trona discharge port（12-10）With turbine powder concentrator（12-11）Horizontal side meal outlet connects, the air inlet
（12-8）With from desulfurization fume bypass duct（9）The pipeline all the way separated connects, the trona discharge port（12-10）With eddy flow
Nozzle sets（20-2）Pipeline connects.
2. a kind of coal-fired flue-gas sulfur trioxide removing means according to claim 1, which is characterized in that described device is also wrapped
Include flowmeter a（10）, gas boosting pump a（11）, pressure gauge a（13）With shut-off valve a（14）, the flowmeter a（10）, gas increase
Press pump a（11）, pressure gauge a（13）With shut-off valve a（14）It is sequentially connected to desulfurization fume bypass duct（9）With collision type fluid bed
Trona crushes modifying device（12）Between the pipeline all the way to connect.
3. a kind of coal-fired flue-gas sulfur trioxide removing means according to claim 1, which is characterized in that described device is also wrapped
Include flowmeter b（15）, gas boosting pump b（16）, pressure gauge b（17）With shut-off valve b（18）, the flowmeter b（15）, gas increase
Press pump b（16）, pressure gauge b（17）With shut-off valve b（18）It is sequentially connected to desulfurization fume bypass duct（9）With smoke inlet（20-
1）Between the another way pipeline to connect.
4. a kind of coal-fired flue-gas sulfur trioxide removing means according to claim 1, which is characterized in that described device is also wrapped
Include SO3Concentration detector（19）, the SO3Concentration detector（19）Set on SCR denitration reactor（2）With quenched trona eddy flow
Injector（20）Between the pipeline to connect.
5. a kind of coal-fired flue-gas sulfur trioxide removing means according to claim 1, which is characterized in that the swirl nozzle
Group（20-2）In in the main burner on two groups of nozzles of flue vertical walls two small nozzle angles be set as with horizontal plane
For axis, be counterclockwise in 35 ° or 345 °, in the main burner in remaining nozzle sets two small nozzle angles be set as be with horizontal plane
Axis is in 45 ° or 315 ° counterclockwise.
6. based on a kind of application method of coal-fired flue-gas sulfur trioxide removing means described in claim 1, which is characterized in that institute
The method of stating includes the following steps：By trona from trona feed inlet（12-1）It is sent into feed bin；Then pass through scroll feeder
（12-6）It is sent into gas and grinds room（12-9）, by desulfurization fume bypass duct（9）In the desulfurization fume all the way that separates be sent into air inlet
（12-8）；Trona after crushing enters turbine powder concentrator（12-11）, turbine powder concentrator（12-11）By grain size less than 10 μm
Fine powder is sent into swirl nozzle group（20-2）, from desulfurization fume bypass duct（9）In the effect of another way desulfurization fume that separates
Lower feeding smoke inlet（20-1）, by swirl nozzle group（20-2）Interior trona is from exhanst gas outlet（20-3）It sprays, to exchange
Matter trona swirl injection device（20）And air preheater（3）Between pipeline in coal-fired flue-gas carry out SO3Removing.
7. a kind of application method of coal-fired flue-gas sulfur trioxide removing means according to claim 6, which is characterized in that institute
State air inlet（12-8）The pressure of gas be more than 0.7 MPa, Mach 2 ship 1.4 ~ 2.5, nozzle back pressure be 88.54kPa ~
64.88kPa。
8. the application based on device described in claim 1 in coal-fired flue-gas removes sulfur trioxide.
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| WO2024003034A3 (en) * | 2022-06-27 | 2024-02-22 | Thomas Nikolaus | Method for cleaning combustion-process exhaust gas and combustion system with exhaust-gas cleaning |
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Application publication date: 20181019 |