CN207822731U - Flue gas dust collecting system and thermal power plant - Google Patents
Flue gas dust collecting system and thermal power plant Download PDFInfo
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- CN207822731U CN207822731U CN201721800758.9U CN201721800758U CN207822731U CN 207822731 U CN207822731 U CN 207822731U CN 201721800758 U CN201721800758 U CN 201721800758U CN 207822731 U CN207822731 U CN 207822731U
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- ammonia
- flue gas
- sulfur trioxide
- sulfur
- dust collecting
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- 239000000428 dust Substances 0.000 title claims abstract description 111
- 239000003546 flue gas Substances 0.000 title claims abstract description 92
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 87
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 175
- AKEJUJNQAAGONA-UHFFFAOYSA-N sulfur trioxide Chemical compound O=S(=O)=O AKEJUJNQAAGONA-UHFFFAOYSA-N 0.000 claims abstract description 174
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 98
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 81
- 239000011593 sulfur Substances 0.000 claims abstract description 54
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 54
- 239000012716 precipitator Substances 0.000 claims abstract description 50
- 239000005864 Sulphur Substances 0.000 claims abstract description 45
- 239000007789 gas Substances 0.000 claims abstract description 38
- 238000012546 transfer Methods 0.000 claims abstract description 30
- 238000013459 approach Methods 0.000 claims abstract description 29
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000004202 carbamide Substances 0.000 claims abstract description 28
- 238000000197 pyrolysis Methods 0.000 claims abstract description 28
- 238000002844 melting Methods 0.000 claims abstract description 26
- 230000008018 melting Effects 0.000 claims abstract description 26
- 238000010531 catalytic reduction reaction Methods 0.000 claims abstract description 23
- 239000000463 material Substances 0.000 claims description 49
- 238000013461 design Methods 0.000 claims description 21
- 239000003054 catalyst Substances 0.000 claims description 18
- 238000005507 spraying Methods 0.000 claims description 16
- 230000003197 catalytic effect Effects 0.000 claims description 14
- 238000004519 manufacturing process Methods 0.000 claims description 14
- 238000010790 dilution Methods 0.000 claims description 10
- 239000012895 dilution Substances 0.000 claims description 10
- 230000005611 electricity Effects 0.000 claims description 10
- 239000007921 spray Substances 0.000 claims description 8
- 238000012545 processing Methods 0.000 claims description 7
- 239000000779 smoke Substances 0.000 claims description 6
- 238000006555 catalytic reaction Methods 0.000 claims description 4
- 230000008859 change Effects 0.000 claims description 3
- 238000002407 reforming Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 7
- 238000003915 air pollution Methods 0.000 abstract description 2
- 238000010276 construction Methods 0.000 abstract description 2
- 230000002265 prevention Effects 0.000 abstract description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 12
- 238000000034 method Methods 0.000 description 12
- 239000000654 additive Substances 0.000 description 9
- 230000000996 additive effect Effects 0.000 description 9
- 239000002956 ash Substances 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 239000003245 coal Substances 0.000 description 7
- 230000009977 dual effect Effects 0.000 description 7
- 239000002245 particle Substances 0.000 description 7
- 238000001321 HNCO Methods 0.000 description 6
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 5
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 5
- 238000001556 precipitation Methods 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- OWIKHYCFFJSOEH-UHFFFAOYSA-N Isocyanic acid Chemical compound N=C=O OWIKHYCFFJSOEH-UHFFFAOYSA-N 0.000 description 4
- 238000006477 desulfuration reaction Methods 0.000 description 4
- 230000023556 desulfurization Effects 0.000 description 4
- 239000003792 electrolyte Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000008187 granular material Substances 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 239000004071 soot Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- 239000010881 fly ash Substances 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 230000007062 hydrolysis Effects 0.000 description 3
- 238000006460 hydrolysis reaction Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000005453 pelletization Methods 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- PVNIIMVLHYAWGP-UHFFFAOYSA-N Niacin Chemical compound OC(=O)C1=CC=CN=C1 PVNIIMVLHYAWGP-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 229910052681 coesite Inorganic materials 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 229910052593 corundum Inorganic materials 0.000 description 2
- 229910052906 cristobalite Inorganic materials 0.000 description 2
- 239000012717 electrostatic precipitator Substances 0.000 description 2
- 235000013312 flour Nutrition 0.000 description 2
- 239000003500 flue dust Substances 0.000 description 2
- 239000003517 fume Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000003607 modifier Substances 0.000 description 2
- 229960003512 nicotinic acid Drugs 0.000 description 2
- 235000001968 nicotinic acid Nutrition 0.000 description 2
- 239000011664 nicotinic acid Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229910052682 stishovite Inorganic materials 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 229910052905 tridymite Inorganic materials 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910009112 xH2O Inorganic materials 0.000 description 2
- 229910001845 yogo sapphire Inorganic materials 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 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 1
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000010883 coal ash Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005367 electrostatic precipitation Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000013067 intermediate product Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000000289 melt material Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 210000002700 urine Anatomy 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
- Y02A50/2351—Atmospheric particulate matter [PM], e.g. carbon smoke microparticles, smog, aerosol particles, dust
Landscapes
- Treating Waste Gases (AREA)
Abstract
The utility model is related to big power station's prevention and control of air pollution field, a kind of flue gas dust collecting system and thermal power plant are disclosed.The flue gas dust collecting system includes the quenched unit of sulfur trioxide, the quenched unit of ammonia and electric precipitator unit, the quenched unit of sulfur trioxide includes sulfur trioxide source generating means, the quenched unit of ammonia includes ammonia gas generating device, the electric precipitator unit includes electric precipitator and electric precipitator gas approach, wherein, the electric precipitator gas approach is accessed in flow of flue gas direction along the electric precipitator gas approach successively for the outlet of the sulfur trioxide transfer pipeline and the outlet of the ammonia transfer pipeline, sulfur trioxide source generating means includes the dry sulphur warehouse being linked in sequence successively, batcher, sulfur melting kettle, molten sulphur metering pump and sulfur trioxide produce module, the ammonia gas generating device is the urea pyrolysis stove in selective-catalytic-reduction denitrified system.The good dedusting effect of the flue gas dust collecting system, construction cost are low.
Description
Technical field
The utility model is related to big power station's prevention and control of air pollution fields, and in particular to a kind of flue gas dust collecting system and adopt
With the thermal power plant of above-mentioned flue gas dust collecting system.
Background technology
The design of Zhun electricity companies is using quasi- Ge Er smalls and washes middle coal, and the dust generated after coal burning carrys out electric precipitator
Say it is the coal for being extremely hard to capture --- in low-sulfur (0.43%), low hydrogen (3.42%), high grey (31.7%) and coal ash
Superelevation aluminium (51.72% Al2O3), low iron (1.38% Fe2O3), low sodium (0.02% Na2O), low potassium (0.43%
K2O), a variety of unfavorable factors start at the same time, cause flue dust light specific gravity, fine size, specific resistance high, belong to the flue dust item of particular difficulty
Part.
The electrostatic precipitator that Zhun electricity companies 4 × 330MW crew qitings are produced by Lanzhou Electric Power Building and Repairing Factory.No.1 stove is RWD/
Five E field electrostatic formula electric precipitator of the types of KFH432-3 × 3.0+2 × 3.5 dual chamber, puts into operation in April, 2002, designs efficiency of dust collection
99.6%.Dust Al after being burnt due to Zhungeer coal2O3+SiO2Content is up to 90%, and dust alkalinous metal content and flue gas contain
Sulphur is low, and the characteristic that dust has light specific gravity, fine size, specific resistance high causes the practical efficiency of dust collection of electric precipitation can only achieve
99.52%, design value is not reached.House outlet dust emission concentration is 116mg/Nm3, chimney Inlet dust concentration of emission is
69.3mg/Nm3。
On July 29th, 2011, State Ministry of Environmental Protection issues《Thermal power plant's pollutant emission standard》(GB13223-2011), it
Seek chimney entrance soot emissions≤30mg/Nm3.Dust pelletizing system carries out technical renewal transformation and is arranged with reaching the newest pollutant of country
It is imperative to put standard.
Utility model content
Al in dust after burning the purpose of this utility model is to overcome Zhungeer coal of the existing technology2O3With
SiO2Content is high, and dust alkalinous metal content and flue gas sulfur-bearing are low, the characteristic that dust has light specific gravity, fine size, specific resistance high,
Cause the practical efficiency of dust collection of electric precipitation poor, design value can not be reached.House outlet dust emission concentration is higher, and chimney enters
Mouth dust emission concentration is higher, not up to standard as defined in National Environmental Protection Agency, and in existing flue gas ash removal technology, uses liquid
Sulphur is as sulfur trioxide adjusting material source, and using external ammonia source as ammonia adjusting material source, system operation input cost is higher,
And the dosage of adjusting material is difficult to control, if the dosage control of adjusting material is improper not only to influence dust removing effects, can also influence fire
The defect of the economy of power generator group operation, provides a kind of flue gas dust collecting system and thermal power plant, uses the utility model
The flue gas dust collecting system of offer, which carries out flue gas ash removal, has high dust collection efficiency, the low advantage of exhanst gas outlet dust concentration, Ke Yi
Under the dosage of less adjusting material, preferably quenched effect is obtained, while equipment and raw material Meteorological can also be substantially reduced.
To achieve the goals above, on the one hand the utility model provides a kind of flue gas dust collecting system, the flue gas ash removal system
System includes the quenched unit of sulfur trioxide, the quenched unit 6 of ammonia and electric precipitator unit, and the quenched unit of sulfur trioxide includes：
Sulfur trioxide source generating means with sulfur trioxide transfer pipeline, the quenched unit of the ammonia 6 include：With ammonia delivery pipe
The ammonia gas generating device 61 on road, the electric precipitator unit include：Electric precipitator 7 and electric precipitator gas approach 8, wherein institute
The outlet of the outlet and the ammonia transfer pipeline of stating sulfur trioxide transfer pipeline is successively along the electric precipitator gas approach 8
The electric precipitator gas approach 8 is accessed in flow of flue gas direction, and sulfur trioxide source generating means includes being linked in sequence successively
Dry sulphur warehouse 1, batcher 2, sulfur melting kettle 3, molten sulphur metering pump 4 and sulfur trioxide produce module 5, the ammonia gas generating device 61
For the urea pyrolysis stove in selective-catalytic-reduction denitrified system.
Preferably, the sulfur trioxide production module 5 includes the sulfur burning device 51 and catalyst 52 of connection setting,
The sulfur burning device 51 is connect with the molten sulphur metering pump 4, and the molten sulphur metering pump 4 is used for the material in sulfur melting kettle 3 is defeated
It send to the sulfur burning device 51, the product catalyst that the catalyst 52 is used to generate in the sulfur burning device 51
It is converted to sulfur trioxide, the outlet of the catalyst 52 is connect with the entrance of the sulfur trioxide transfer pipeline.
Preferably, the sulfur trioxide production module 5 further includes sequentially connected dilution air 53 and electric heater 54, institute
Dilution air 53 is stated for delivering the air in the electric heater 54, the electric heater 54 is used to heat air, institute
The outlet for stating electric heater 54 is connect with the entrance of the sulfur burning device 51.
Preferably, the quenched unit of the ammonia 6 further includes ammonia-spraying grid 62, and the ammonia-spraying grid 62 is urged with the selectivity
The outlet connection for changing the urea pyrolysis stove in reduction denitrating system, is used for the urine in the selective-catalytic-reduction denitrified system
The ammonia that plain pyrolysis oven generates sprays into denitrating system leading portion flue.
Preferably, the quenched unit of the ammonia 6 further includes the catalytic convention design 63 of connection setting and adjusts valve group 64, institute
State the entrance of catalytic convention design 63 and the urea pyrolysis stove in the selective-catalytic-reduction denitrified system and the spray ammonia lattice
Ammonia transfer pipeline connection setting between grid 62, the outlet of the catalytic convention design 63 and the entrance for adjusting valve group 64
Connection, the outlet for adjusting valve group 64 access the electric precipitator gas approach 8.
Preferably, the exit of the sulfur trioxide transfer pipeline is provided with nozzle, for spraying sulfur trioxide to institute
State electric precipitator gas approach 8.
Preferably, the exit of the ammonia transfer pipeline is provided with nozzle, for spraying ammonia to the electric precipitation
Device gas approach 8.
Preferably, the batcher 2 is screw(-type) feeder.
Preferably, 3 outer wall of the sulfur melting kettle is equipped with chuck, and confined air is formed between the chuck and the sulfur melting kettle 3
Between for be used as heat exchanging medium passage.
The utility model second aspect provides a kind of thermal power plant, and the smoke processing system in the thermal power plant is successively
Including flue gas denitrification system, flue gas dust collecting system and flue gas desulphurization system, wherein the flue gas dust collecting system in the thermal power plant
For foregoing smoke dust pelletizing system.
Compared with prior art, flue gas dust collecting system described in the utility model and the advantages of thermal power plant, are：
It (1), can be in less adjusting material when carrying out flue gas ash removal using flue gas dust collecting system provided by the utility model
Dosage under, obtain preferably dust removing effects, obtain higher high dust collection efficiency and lower exhanst gas outlet dust concentration；
(2) flue gas dust collecting system provided by the utility model can use the sulfur trioxide adjusting material that dry sulphur is used as
Source convenient for storage and stringent control dosage, while can also effectively improve sulphur trioxide conversion rate, save the use of sulfur feedstock
Amount；
(3) flue gas dust collecting system provided by the utility model can rationally utilize the selective catalytic reduction (SCR) of front and continued
The ammonia that urea pyrolysis stove in denitrating system generates is as ammonia adjusting material source, it is only necessary to simply be changed to existing boiler
It makes, short time limit is transformed, construction cost is low, greatly reduces equipment and expense of raw materials, good economy performance；
(4) when carrying out flue gas ash removal using flue gas dust collecting system provided by the utility model, it is ensured that sulfur trioxide tune
The dosage of matter agent and ammonia adjusting material is minimum, the NH of formation4HSO4Amount be also minimum, to ensure NH4HSO4All by powder
Dirt absorbs, and prevents NH3Into flue gas-smoke re-heater (GGH) in the wet desulfurization of flue gas by limestone-gypsum method system of downstream, have
Effect prevents soot particle on GGH elements from depositing, and will not influence the efficiency of follow-up flue gas desulfurization and the quality of the flyash of formation, have
Effect prevents SO3Dissipation, H can be formed in flue gas2SO3Gas, and combined to form niacin gas to downstream with the moisture in flue gas
Electric precipitator, desulphurization system, flue and air-introduced machine cause sour corrosion.
Description of the drawings
Fig. 1 is the structural schematic diagram of flue gas dust collecting system provided by the utility model.
Reference sign
1, dry sulphur warehouse 2, screw(-type) feeder 3, sulfur melting kettle
4, sulphur metering pump 5, sulfur trioxide production module 51, sulfur burning device are melted
52, catalyst 53, dilution air 54, electric heater
6, the quenched unit 61 of ammonia, ammonia gas generating device 62, ammonia-spraying grid
63, catalytic convention design 64, adjusting valve group 7, electric precipitator
8, electric precipitator gas approach
Specific implementation mode
Specific embodiment of the present utility model is described in detail below in conjunction with attached drawing.It should be understood that herein
Described specific implementation mode is only used for describing and explaining the present invention, and is not intended to limit the utility model.
The endpoint of disclosed range and any value are not limited to the accurate range or value herein, these ranges or
Value should be understood as comprising the value close to these ranges or value.For numberical range, between the endpoint value of each range, respectively
It can be combined with each other between the endpoint value of a range and individual point value, and individually between point value and obtain one or more
New numberical range, these numberical ranges should be considered as specific open herein.
The utility model provides a kind of flue gas dust collecting system, the flue gas dust collecting system include the quenched unit of sulfur trioxide,
The quenched unit 6 of ammonia and electric precipitator unit, the quenched unit of sulfur trioxide include：Three with sulfur trioxide transfer pipeline
Aoxidize sulphur source generating means, the quenched unit of the ammonia 6 includes：Ammonia gas generating device 61 with ammonia transfer pipeline, it is described
Electric precipitator unit includes：Electric precipitator 7 and electric precipitator gas approach 8, wherein the outlet of the sulfur trioxide transfer pipeline
The flow of flue gas direction access electricity removes along the electric precipitator gas approach 8 successively for outlet with the ammonia transfer pipeline
Dirt device gas approach 8, sulfur trioxide source generating means include the dry sulphur warehouse 1 being linked in sequence successively, batcher 2, molten sulphur
Kettle 3, molten sulphur metering pump 4 and sulfur trioxide produce module 5, and the ammonia gas generating device 61 is selective-catalytic-reduction denitrified system
In urea pyrolysis stove.
During being dusted to flue gas using flue gas dust collecting system provided by the utility model, enters electricity in flue gas and remove
Before dirt device 7, flue gas is made successively to pass through sulfur trioxide adjusting material and the dual modifier treatment of ammonia adjusting material, sulfur trioxide adjusting material
It for reducing dust specific resistance, is dominated as quenched, ammonia adjusting material is used for improving surface charge and dust adhesion, reduces
Reentrainment of dust is then used as its auxiliary and supplement part to use.The dual quenched processing procedure includes the following steps successively：
(1) suitable sulfur trioxide adjusting material is sprayed into flue gas stream, and H is formed in flue gas2SO3Gas works as flue-gas temperature
When relatively low, H2SO3And H2O is adsorbed on fly ash granule surface and forms a thin layer of conductive film on dust surface, to reduce soot particle
Specific resistance makes the specific resistance of dust reach ideal range, it is made to be attached to dust surface, utilizes the characteristic of its electrolyte, drop
The specific resistance of self raising flour dirt enhances the charge capacity of powder dust particle, and most of dust is captured by electric precipitator 7, to effectively drop
Low dust emission improves efficiency of dust collection.
(2) suitable ammonia adjusting material is added after sulfur trioxide adjusting material is added, makes NH3With SO3Reaction production tool
The NH of toughness and electrolyte characteristics4HSO4, while reducing the specific resistance of flying dust, dust surface charge and adhesion are improved,
Reentrainment of dust is reduced, promotes small size dust granule to agglomerate, becomes the large dust particle easily captured.
According to the utility model, the electric precipitator 7 can be that electrostatic precipitator or electrostatic precipitation and bag-type dust are compound
The electric bag compound type dust remover of formation.
When carrying out flue gas ash removal using flue gas dust collecting system provided by the utility model, the dust concentration of flue gas can be
46-54g/Nm3, the additive amount of sulfur trioxide adjusting material is 14-28ppm, and the additive amount of ammonia adjusting material is 3-8ppm.In this reality
In novel, the additive amount of the additive amount of the sulfur trioxide adjusting material and the ammonia adjusting material refers in the flue gas for waiting for dedusting
In, a concentration of 14-28ppm of the sulfur trioxide adjusting material, a concentration of 3-8ppm of the ammonia adjusting material.Specifically, exist
In the flue gas of one million weight portions, the additive amount of the sulfur trioxide adjusting material is 14-28 parts by weight, the ammonia adjusting material
Additive amount is 3-8 parts by weight.
In general, the flue gas that coal-fired boiler in power plant generates passes through denitration, dedusting and desulfurization process successively, to meet discharge mark
It is accurate.The denitration process preferably carries out in selective catalytic reduction (SCR) denitrating system.
According to the utility model, sulfur trioxide source generating means includes the dry sulphur warehouse 1 being linked in sequence successively, feed
Machine 2, sulfur melting kettle 3, molten sulphur metering pump 4 and sulfur trioxide produce module 5.The dry sulphur warehouse 1 passes through for storing dry sulphur
Dry sulphur is delivered in sulfur melting kettle 3 by batcher 2, and the fusing in the sulfur melting kettle 3 of solid dry sulphur forms the sulphur of liquid,
It is delivered to sulfur trioxide production module 5 through molten sulphur metering pump 6 after, carries out the production of follow-up sulfur trioxide adjusting material.Described three
Sulphur source generating means is aoxidized due to above structure, being not only convenient for the storage of sulphur, the throwing of sulphur can also be accurately controlled
Doses.
According to the utility model, the sulfur trioxide production module 5 preferably includes 51 He of sulfur burning device of connection setting
Catalyst 52, the sulfur burning device 51 are connect with the molten sulphur metering pump 4, and the molten sulphur metering pump 4 is used for molten sulphur
Liquid-state sulfur in kettle 3 is delivered in the sulfur burning device 51, is burnt, and liquid-state sulfur is in the sulfur burning device 51
Burning generates sulfur dioxide, and the catalyst 52 is used to urge the product sulfur dioxide generated in the sulfur burning device 51
Change is converted to sulfur trioxide, it is preferable that sulfur dioxide is catalytically converted into the process of sulfur trioxide in catalyst V2O5In the presence of into
Row, usual sulfur dioxide are catalytically converted into the conversion ratio of sulfur trioxide up to 98% or more.The outlet of the catalyst 52
It is connect with the entrance of the sulfur trioxide transfer pipeline, the sulfur trioxide formed in the catalyst 52, which is delivered to electricity, to be removed
Dirt device gas approach 8.
According to the utility model, in order to strictly control the inventory of dry sulphur material, ensure the uniform and stable of feed, it is described to give
Material machine 2 is preferably screw(-type) feeder.When the batcher 2 is screw(-type) feeder, pass through title by the material of the batcher 2
Weight crane span structure is detected weight, it may be determined that the weight of material on adhesive tape, rear-mounted Digital Speed Testing sensor are continuous to survey
The speed of service of batcher is measured, the pulse output of the velocity sensor is proportional to the speed of batcher, speed signal and weight letter
It is sent into the controller of batcher 2 number together, the microprocessor in controller is handled, and is generated and is shown cumulative amount/instantaneous stream
Amount.The flow is compared with setting flow, changes the actuating speed of batcher by control instrument output signal control frequency converter,
So that the mass flow on batcher is changed, approach and be maintained at set feed flow, to realize dosing
It is required that.
According to the utility model, 3 outer wall of the sulfur melting kettle is equipped with chuck, shape between the chuck and the sulfur melting kettle 3
It is used to be used as heat exchanging medium passage at confined space.The chuck is usually made of steel and cast iron, solderable in 3 outer wall of sulfur melting kettle
Above or it is screwed on the flange of 3 outer wall of sulfur melting kettle.In the present invention, heat transferring medium is used steam as to institute
It states sulfur melting kettle 3 to be heated, steam is led to by the heat exchanging medium passage entrance positioned at 3 top of sulfur melting kettle into the heat transferring medium
Road, then the heat exchanging medium passage is discharged by the heat exchanging medium passage outlet positioned at 3 lower part of sulfur melting kettle in condensed water, to melting sulphur
Kettle 3 provides enough heats and melts the sulphur to form liquid for solid dry sulphur.
According to the utility model, the sulfur trioxide production module 5 further includes that sequentially connected dilution air 53 and electricity add
Hot device 54, for delivering the air in the electric heater 54, the electric heater 54 is used for sky the dilution air 53
Gas heats, and the outlet of the electric heater 54 is connect with the entrance of the sulfur burning device 51.Mould is produced in the sulfur trioxide
In block 5, the air that the dilution air 53 provides is heated to sulfur burning required temperature, high temperature air by the electric heater 54
Combustion reaction occurs with sulphur in into the sulfur burning device 51 and generates sulfur dioxide.
According to the utility model, the ammonia gas generating device 61 is the urea pyrolysis in selective-catalytic-reduction denitrified system
Stove can directly use the ammonia that the urea pyrolysis stove in selective catalytic reduction (SCR) denitrating system generates as ammonia in this way
The source of gas adjusting material, it is only necessary to existing boiler be simply transformed, and expense of raw materials can be greatlyd save, and will not
Influence the denitrating flue gas processing of leading portion.
According to the utility model, due to directly using the urea pyrolysis stove in selective catalytic reduction (SCR) denitrating system
Source of the ammonia of generation as ammonia adjusting material, therefore, the quenched unit of the ammonia 6 further includes ammonia-spraying grid 62, the spray
Ammonia grid 62 is connect with the outlet of the urea pyrolysis stove in the selective-catalytic-reduction denitrified system, is used for the selectivity
The ammonia that urea pyrolysis stove in catalytic-reduction denitrified system generates sprays into denitrating system leading portion flue.
According to the utility model, due to directly using the urea pyrolysis stove in selective catalytic reduction (SCR) denitrating system
Source of the ammonia of generation as ammonia adjusting material, urea pyrolysis process is complicated, and decomposition reaction equation is as follows：
NH2-CO-NH2·xH2O→NH2-CO-NH2+xH2O
NH2-CO-NH2→NH3+HNCO
HNCO+H2O→NH3+CO2
Urea pyrolysis will produce the intermediate products such as HNCO, and further hydrolysis can continue to generate NH HNCO3, in order to make urea
It is converted into ammonia to the maximum extent, the quenched unit of the ammonia 6 further includes catalytic convention design 63, in urea pyrolysis product
Hydrolysis occurs in the catalytic convention design 63 and generates NH by HNCO3, the catalysis that hydrolysis uses occurs for HNCO
Agent can be V2O5-WO3/TiO2、Cu-ZSM5、Fe-ZSM5、TiO2、Al2O3At least one of.
According to the utility model, in order to more accurately regulate and control from the urea in selective catalytic reduction (SCR) denitrating system
The extraction amount for the ammonia that pyrolysis oven generates, the preferred quenched unit 6 of ammonia further includes adjusting valve group 64, passes through and controls the tune
The aperture of valve group 64 is saved, the additive amount of ammonia adjusting material is accurately regulated and controled.
According to the utility model, in the quenched unit of the ammonia 6, catalytic convention design 63 is set with adjusting valve group 64 and be connected to
It sets, the urea pyrolysis stove in the entrance of the catalytic convention design 63 and the selective-catalytic-reduction denitrified system and the spray
Ammonia transfer pipeline connection setting between ammonia grid 62, the outlet of the catalytic convention design 63 and the adjusting valve group 64
Entrance connects, and the outlet for adjusting valve group 64 accesses the electric precipitator gas approach 8.Due to the quenched unit of the ammonia 6
With above structure, the ammonia that ammonia adjusting material can be generated by the urea pyrolysis stove in selective-catalytic-reduction denitrified system can
Control ground is added into the flue gas in electric precipitator gas approach 8.
According to the utility model, in order to make sulfur trioxide adjusting material be come into full contact with the dust in flue gas, three oxidation
The exit of sulphur transfer pipeline is provided with nozzle, for spraying sulfur trioxide to the electric precipitator gas approach 8.
According to the utility model, in order to make ammonia adjusting material be come into full contact with the dust in flue gas, the ammonia delivery pipe
The exit on road is provided with nozzle, for spraying ammonia to the electric precipitator gas approach 8.
The utility model also provides a kind of smoke processing system in thermal power plant, the fume treatment in the thermal power plant
System includes successively flue gas denitrification system, flue gas dust collecting system and flue gas desulphurization system, makes fire coal boiler fume successively by de-
Nitre processing, dust removal process and desulfurization process, to meet discharge standard, wherein the flue gas dust collecting system in the thermal power plant is
Foregoing smoke dust pelletizing system.
Carrying out flue gas ash removal using flue gas dust collecting system provided by the utility model has high dust collection efficiency, exhanst gas outlet powder
The low advantage of dust concentration can obtain preferably dust removing effects, while can also save sulphur under the dosage of less adjusting material
The dosage of raw material, the ammonia rationally generated using the urea pyrolysis stove in selective catalytic reduction (SCR) denitrating system of front and continued
As ammonia adjusting material source, scrap build and raw material Meteorological are substantially reduced, and also can effectively prevent niacin gas under
Electric precipitator, desulphurization system, flue and the air-introduced machine of trip cause sour corrosion and improve the serious feelings of contamination of boiler tail
Condition.
The utility model will be described in detail by embodiment below.
In following embodiment, middle coal, 4 × 330MW units, RWD/ using quasi- Ge Er smalls and are washed with the design of certain genco
For the dual flue gas conditioning improvement project of five E field electrostatic formula electric precipitator of the types of KFH432-3 × 3.0+2 × 3.5 dual chamber.Electricity removes
Dirt single-sided design inlet flue gas amount 1.1548 × 106m3/ h, electric precipitator entrance excess air coefficient 1.4, deduster inlet flue gas
127 DEG C of temperature.It is 116mg/Nm that electric precipitation, which exports practical dust emission concentration, before transformation3, chimney Inlet dust concentration of emission is
69.3mg/Nm3, the practical efficiency of dust collection of electric precipitation is 99.52%.
Embodiment 1
As shown in Figure 1, the utility model provides a kind of flue gas dust collecting system, the flue gas dust collecting system includes sulfur trioxide
The quenched unit 6 of quenched unit, ammonia and electric precipitator unit, the quenched unit of sulfur trioxide include：It is defeated with sulfur trioxide
Send the sulfur trioxide source generating means of pipeline, the quenched unit of the ammonia 6 includes：Ammonia with ammonia transfer pipeline fills
61 are set, the electric precipitator unit includes：Electric precipitator 7 and electric precipitator gas approach 8, wherein the sulfur trioxide conveying
Flow of flue gas direction connects along the electric precipitator gas approach 8 successively for the outlet of pipeline and the outlet of the ammonia transfer pipeline
Enter the electric precipitator gas approach 8, sulfur trioxide source generating means includes dry sulphur warehouse 1, the spiral shell being linked in sequence successively
It revolves batcher 2, sulfur melting kettle 3, molten sulphur metering pump 4 and sulfur trioxide and produces module 5, the ammonia gas generating device 61 is that selectivity is urged
Change the urea pyrolysis stove in reduction denitrating system.The sulfur trioxide production module 5 includes the sulfur burning device 51 of connection setting
With catalyst 52, the sulfur burning device 51 is connect with the molten sulphur metering pump 4, and the molten sulphur metering pump 4 will be for that will melt
Material in sulphur kettle 3 is delivered in the sulfur burning device 51, and the catalyst 52 is used for the sulfur burning device 51
The product catalyst of interior generation is converted to sulfur trioxide, and sulfur dioxide is catalytically converted into the process of sulfur trioxide in catalyst V2O5's
In the presence of carry out, the outlet of the catalyst 52 is connect with the entrance of the sulfur trioxide transfer pipeline.Three oxidation
Sulphur production module 5 further includes sequentially connected dilution air 53 and electric heater 54, and the dilution air 53 is used for air is defeated
Send to the electric heater 54, the electric heater 54 be used for air heat, the outlet of the electric heater 54 with it is described
The entrance of sulfur burning device 51 connects.The quenched unit of the ammonia 6 further includes ammonia-spraying grid 62, the ammonia-spraying grid 62 with it is described
The outlet of urea pyrolysis stove in selective-catalytic-reduction denitrified system connects, and is used for the selective-catalytic-reduction denitrified system
The ammonia that urea pyrolysis stove in system generates sprays into denitrating system leading portion flue.The quenched unit of the ammonia 6 further includes that connection is set
The catalytic convention design 63 and adjusting valve group 64, the entrance of the catalytic convention design 63 set are de- with the selective catalytic reduction
Ammonia transfer pipeline connection setting between urea pyrolysis stove and the ammonia-spraying grid 62 in nitre system, the catalyzed conversion dress
It sets 63 outlet connect with the entrance for adjusting valve group 64, the outlet access electric precipitator entrance of the adjusting valve group 64
Flue 8 is filled with V in the catalytic convention design 632O5-WO3/TiO2Catalyst.The outlet of the sulfur trioxide transfer pipeline
It is both provided with nozzle with the exit of the ammonia transfer pipeline, is respectively used to spray sulfur trioxide and ammonia to the electricity and remove
Dirt device gas approach 8.It forms confined space between the chuck and the sulfur melting kettle 3 to be used to be used as heat exchanging medium passage, at this
It in utility model, uses steam as heat transferring medium and the sulfur melting kettle 3 is heated, steam is by positioned at 3 top of sulfur melting kettle
Heat exchanging medium passage entrance enters the heat exchanging medium passage, and condensed water is then by the heat exchanging medium passage positioned at 3 lower part of sulfur melting kettle
The heat exchanging medium passage is discharged in outlet.
During being dusted to flue gas using flue gas dust collecting system provided by the utility model, enters electricity in flue gas and remove
Before dirt device, flue gas is made successively to pass through sulfur trioxide adjusting material and the dual modifier treatment of ammonia adjusting material, sulfur trioxide adjusting material
It for reducing dust specific resistance, is dominated as quenched, ammonia adjusting material is used for improving surface charge and dust adhesion, reduces
Reentrainment of dust is then used as its auxiliary and supplement part to use.The dual quenched processing procedure includes the following steps successively：
(1) suitable sulfur trioxide adjusting material is sprayed into flue gas stream, and H is formed in flue gas2SO3Gas works as flue-gas temperature
When relatively low, H2SO3And H2O is adsorbed on fly ash granule surface and forms a thin layer of conductive film on dust surface, to reduce soot particle
Specific resistance makes the specific resistance of dust reach ideal range, it is made to be attached to dust surface, utilizes the characteristic of its electrolyte, drop
The specific resistance of self raising flour dirt enhances the charge capacity of powder dust particle, and most of dust is captured by electric precipitator 7, to effectively drop
Low dust emission improves efficiency of dust collection.
(2) suitable ammonia adjusting material is added after sulfur trioxide adjusting material is added, makes NH3With SO3Reaction production tool
The NH of toughness and electrolyte characteristics4HSO4, while reducing the specific resistance of flying dust, dust surface charge and adhesion are improved,
Reentrainment of dust is reduced, promotes small size dust granule to agglomerate, becomes the large dust particle easily captured.
During carrying out flue gas ash removal using flue gas dust collecting system provided by the utility model, the dust of pending flue gas is dense
Degree is 53.96g/Nm3, the additive amount of control sulfur trioxide adjusting material is 22ppm, and the additive amount of ammonia adjusting material is 8ppm.
Flue gas is after dust removal process, and dust collection efficiency can reach 99.85% or more, the dust row in electric precipitator exit
It puts concentration and can reach 12mg/Nm3, meet State Ministry of Environmental Protection's publication《Thermal power plant's pollutant emission standard》(GB13223-
2011), and single unit reduces by 0.226 ton of dust discharge amount every year, annual to reduce 7,500,000 yuan of blowdown expense.
Preferred embodiments of the present invention described in detail above, still, the utility model is not limited to this.At this
In the range of the technology design of utility model, a variety of simple variants can be carried out to the technical solution of the utility model, including each
Technical characteristic is combined with any other suitable method, these simple variants and combination equally should be considered as the utility model
Disclosure of that belongs to the scope of protection of the utility model.
Claims (10)
1. a kind of flue gas dust collecting system, which is characterized in that the flue gas dust collecting system includes the quenched unit of sulfur trioxide, ammonia tune
Matter unit and electric precipitator unit, the quenched unit of sulfur trioxide include：Sulfur trioxide with sulfur trioxide transfer pipeline
Source generating means, the quenched unit of ammonia (6) include：Ammonia gas generating device (61) with ammonia transfer pipeline, the electricity
Deduster unit includes：Electric precipitator (7) and electric precipitator gas approach (8),
Wherein, the outlet of the sulfur trioxide transfer pipeline and the outlet of the ammonia transfer pipeline are successively along the electric precipitator
The electric precipitator gas approach (8) is accessed in the interior flow of flue gas direction of gas approach (8),
Sulfur trioxide source generating means include the dry sulphur warehouse (1) being linked in sequence successively, batcher (2), sulfur melting kettle (3),
Molten sulphur metering pump (4) and sulfur trioxide production module (5),
The ammonia gas generating device (61) is the urea pyrolysis stove in selective-catalytic-reduction denitrified system.
2. flue gas dust collecting system according to claim 1, wherein the sulfur trioxide production module (5) includes that connection is set
The sulfur burning device (51) and catalyst (52) set, the sulfur burning device (51) connect with the molten sulphur metering pump (4),
The molten sulphur metering pump (4) is used to the material in the sulfur melting kettle (3) being delivered in the sulfur burning device (51), described to urge
Change converter (52) to be used to the product catalyst generated in the sulfur burning device (51) being converted to sulfur trioxide, the catalysis turns
The outlet of parallel operation (52) is connect with the entrance of the sulfur trioxide transfer pipeline.
3. flue gas dust collecting system according to claim 2, wherein the sulfur trioxide production module (5) further includes successively
The dilution air (53) and electric heater (54) of connection, the dilution air (53) is for delivering the air to the electric heater
(54) in, the electric heater (54) is used to heat air, outlet and the sulfur burning device of the electric heater (54)
(51) entrance connection.
4. flue gas dust collecting system according to claim 1, wherein the quenched unit of ammonia (6) further includes ammonia-spraying grid
(62), the ammonia-spraying grid (62) connect with the outlet of the urea pyrolysis stove in the selective-catalytic-reduction denitrified system, uses
Denitrating system leading portion flue is sprayed into the ammonia for generating the urea pyrolysis stove in the selective-catalytic-reduction denitrified system.
5. flue gas dust collecting system according to claim 4, wherein the quenched unit of ammonia (6) further includes connection setting
Catalytic convention design (63) and adjust valve group (64), the entrance of the catalytic convention design (63) with the selective catalysis also
Ammonia transfer pipeline connection setting between urea pyrolysis stove in former denitrating system and the ammonia-spraying grid (62), the catalysis
The outlet of reforming unit (63) is connect with the entrance of the adjusting valve group (64), described in the outlet access for adjusting valve group (64)
Electric precipitator gas approach (8).
6. flue gas dust collecting system according to claim 1, wherein the exit of the sulfur trioxide transfer pipeline is provided with
Nozzle, for spraying sulfur trioxide to the electric precipitator gas approach (8).
7. flue gas dust collecting system according to claim 1, wherein the exit of the ammonia transfer pipeline is provided with spray
Mouth, for spraying ammonia to the electric precipitator gas approach (8).
8. flue gas dust collecting system according to claim 1, wherein the batcher (2) is screw(-type) feeder.
9. flue gas dust collecting system according to claim 1, wherein sulfur melting kettle (3) outer wall is equipped with chuck, the folder
Confined space is formed between set and the sulfur melting kettle (3) to be used to be used as heat exchanging medium passage.
10. a kind of thermal power plant, which is characterized in that the smoke processing system in the thermal power plant includes denitrating flue gas successively
System, flue gas dust collecting system and flue gas desulphurization system, wherein the flue gas dust collecting system in the thermal power plant is claim 1-
Flue gas dust collecting system described in any one of 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721800758.9U CN207822731U (en) | 2017-12-20 | 2017-12-20 | Flue gas dust collecting system and thermal power plant |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721800758.9U CN207822731U (en) | 2017-12-20 | 2017-12-20 | Flue gas dust collecting system and thermal power plant |
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| Publication Number | Publication Date |
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| CN207822731U true CN207822731U (en) | 2018-09-07 |
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ID=63388430
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