CN110385037A - One kind being suitable for high concentrate dust, high-temperature fluctuates flue gas SCR denitration device and method - Google Patents
One kind being suitable for high concentrate dust, high-temperature fluctuates flue gas SCR denitration device and method Download PDFInfo
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- CN110385037A CN110385037A CN201910657544.8A CN201910657544A CN110385037A CN 110385037 A CN110385037 A CN 110385037A CN 201910657544 A CN201910657544 A CN 201910657544A CN 110385037 A CN110385037 A CN 110385037A
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- 239000000428 dust Substances 0.000 title claims abstract description 139
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 93
- 239000003546 flue gas Substances 0.000 title claims abstract description 92
- 238000000034 method Methods 0.000 title claims abstract description 26
- 239000012141 concentrate Substances 0.000 title claims abstract description 20
- 238000005338 heat storage Methods 0.000 claims abstract description 57
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 49
- 238000004140 cleaning Methods 0.000 claims abstract description 30
- 230000008569 process Effects 0.000 claims abstract description 9
- 238000006243 chemical reaction Methods 0.000 claims abstract description 7
- 229910021529 ammonia Inorganic materials 0.000 claims description 23
- 239000007921 spray Substances 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 6
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 6
- 230000003044 adaptive effect Effects 0.000 claims description 6
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 6
- 239000004571 lime Substances 0.000 claims description 6
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 6
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 6
- 238000005245 sintering Methods 0.000 claims description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 5
- 229910052593 corundum Inorganic materials 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 5
- 238000000227 grinding Methods 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 5
- 238000010531 catalytic reduction reaction Methods 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- JTJMJGYZQZDUJJ-UHFFFAOYSA-N phencyclidine Chemical class C1CCCCN1C1(C=2C=CC=CC=2)CCCCC1 JTJMJGYZQZDUJJ-UHFFFAOYSA-N 0.000 claims description 4
- 239000000779 smoke Substances 0.000 claims description 4
- 238000010521 absorption reaction Methods 0.000 claims description 3
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 claims 2
- 239000007789 gas Substances 0.000 abstract description 20
- 239000003054 catalyst Substances 0.000 abstract description 16
- 230000007423 decrease Effects 0.000 abstract description 4
- 238000005507 spraying Methods 0.000 abstract description 4
- 230000003197 catalytic effect Effects 0.000 abstract description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 9
- 239000000843 powder Substances 0.000 description 7
- 230000001105 regulatory effect Effects 0.000 description 7
- 238000009825 accumulation Methods 0.000 description 5
- 229910052500 inorganic mineral Inorganic materials 0.000 description 5
- 239000011707 mineral Substances 0.000 description 5
- 238000003723 Smelting Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 238000003860 storage Methods 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 238000005054 agglomeration Methods 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000002000 scavenging effect Effects 0.000 description 2
- 229910021487 silica fume Inorganic materials 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- -1 by heat exchange Chemical compound 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000009881 electrostatic interaction Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000002779 inactivation Effects 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002006 petroleum coke Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- 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
- B01D53/74—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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
Abstract
A kind of SCR denitration device and method suitable for high concentrate dust, high-temperature fluctuation flue gas of the invention, set gradually that cyclone dust collectors are adjusted for preliminary dust removal, self-adaptive temperature and ultrafine dust pre cleaning device is adaptively to regulate and control flue-gas temperature and remove ultrafine dust and SCR denitration reaction device to remove NOx in flue gas stream direction, self-adaptive temperature is adjusted and ultrafine dust pre cleaning device leads on the flue of SCR reactor ammonia-gas spraying device is arranged；Self-adaptive temperature is adjusted and ultrafine dust pre cleaning device includes vertical tank, the heat storage and sound wave generating device that are laid in vertical tank, temperature realizes automatic adjusument when flue gas flows through heat storage in vertical tank and part ultrafine dust is adsorbed by heat storage, while being disposed in the sound wave generating device in vertical tank and being reunited to ultrafine dust, removed.The present invention pre-processes ultrafine dusts most in kiln gas, solves the problems, such as that a large amount of ultrafine dusts are adsorbed on catalyst surface and catalytic efficiency is caused to decline.
Description
Technical field
The present invention relates to gas denitrifying technology fields, and in particular to one kind is suitable for high concentrate dust, high-temperature fluctuates cigarette
The SCR denitration device and method of gas.
Background technique
Currently, new power plant construction would generally carry out denitration using selective catalytic reduction (SCR) technique.SCR denitration system one
As by SCR reactor, catalyst module, ammonia storage and supply system, ammonia spraying system, economizer bypass, SCR bypass and
The composition such as relevant test control system.Wherein, catalyst module is placed on the flue of SCR reactor as a fixed bed
In, in catalyst fixed bed upstream region, NH3It is injected into flue and is mixed with flue gas.When flue gas flow through it is catalyst fixed bed
When, NH3It is reacted in the presence of catalyst with the nitrogen oxides in flue gas and generates N2, realize denitration.
Many Industrial Stoves exist periodically during production, and this intermittence production method can generate high concentration powder
The flue gas that dirt, high-temperature fluctuate.Such as the smelting of industrial silicon also needs other than needing that ore raw materials is added in smelting process
Petroleum coke and broken coal etc. is added to add materials.Industrial silicium mine hot stove use intermittent operation, whole process have batch turning,
The processes such as stirring, a cycle time-consuming 40 minutes about 2 hours.The process characteristic of industrial silicium mine hot stove determines that its exiting flue gas is deposited
In following characteristics: one, flue gas flow, temperature fluctuation range are larger, and vibration frequency is higher, the time point that flue-gas temperature high level occurs
With mineral hot furnace collapse material or stirring it is corresponding, flue-gas temperature fluctuation range is about at 200 DEG C -650 DEG C；Two, contain in mineral heating furnace flue
Some fine particulates (main component is SILICA FUME) have that adhesiveness is strong, partial size is minimum, large specific surface area, heat-insulating property are extremely strong
Characteristic.Other than industrial silicium mine hot stove, there are also the flue gas of other Industrial Stoves, there is also These characteristics, such as glass furnace, smelting
Golden smelting furnace etc..The smoke characteristic of above-mentioned Industrial Stoves urges the mainstream medium temperature that maturation has been applied to power industry denitrating flue gas
Agent (320 DEG C -420 DEG C of best Applicable temperature) is difficult to directly apply, and a large amount of ultrafine dust is easy to inhale by electrostatic interaction
The surface of attached SCR catalyst, causing active catalyst sites to be blocked causes denitration efficiency to decline.
Summary of the invention
The purpose of the present invention is to provide a kind of SCR denitration devices suitable for high concentrate dust, high-temperature fluctuation flue gas
And method, solve that certain Industrial Stoves exit gas temperature fluctuation ranges are big, are unable to satisfy SCR middle temperature catalyst temperature window
The problem of, it is pre-processed with to ultrafine dusts most in kiln gas, solves a large amount of ultrafine dusts and be adsorbed on and urge
The problem of agent surface causes catalytic efficiency to decline.
To achieve the above object, a kind of SCR denitration suitable for high concentrate dust, high-temperature fluctuation flue gas of the invention fills
It sets, cooperation boiler carries out denitration using and to its flue gas, sets gradually cyclone dust collectors for tentatively removing in flue gas stream direction
Dirt, self-adaptive temperature adjust and ultrafine dust pre cleaning device is adaptively to regulate and control flue-gas temperature and remove ultrafine dust and SCR
Benitration reactor is to remove NOx, and the self-adaptive temperature is adjusted and ultrafine dust pre cleaning device leads to the flue of SCR reactor
Upper arranging ammonia-gas spraying device；
The self-adaptive temperature adjust and ultrafine dust pre cleaning device include vertical tank, the accumulation of heat that is laid in vertical tank
Body and sound wave generating device, temperature realizes automatic adjusument when flue gas flows through heat storage in vertical tank and part ultrafine dust is stored
Hot body absorption, while being disposed in the sound wave generating device in vertical tank and being reunited to ultrafine dust, removed.
Further, the vertical tank is at least provided with two；
Sound wave generating device is arranged in the vertical tank, and the sound wave generating device includes the first sound at the top of vertical tank
Wave producer and the second sonic generator positioned at flow of flue gas lower end；
There is the sound wave that first sonic generator occurs high sound pressure level, low-frequency characteristic to reunite for dust；
Second sonic generator selects the sonic generator of high sound pressure level, wide frequency ranges to remove for dust.
Further, it is 1200Hz-1400Hz, acoustic pressure that first sonic generator, which selects sonic generator frequency of sound wave,
Grade 135dB-155dB；
Or, first sonic generator is arranged side by side two groups, every group alternately occurs sound wave.
Further, the second sonic generator sonic generator sound wave frequency band 30-2100Hz, sound pressure level 125W-
153W；
Or, second sonic generator selects service intermittent that sound wave occurs.
Further, the specific heat capacity of the heat storage is 2.4-2.5KJ/ (KgK).
Further, the heat storage is by 40-50 parts of shale, 12-20 parts of lime, 6-10 parts of silicon carbide, Fe2O310-15
Part, Al2O310-15 parts, CaO10-15 parts, Na2O10-15 parts, 4-6 parts of water, through grinding, drying, sintering after preparing in proportion
After generate；
Or, the heat storage is parallel, neatly piles up in vertical tank, and it is used as heat storage with vertical top tank structure preset clearance
Dilatation joint；
Or, the heat storage selects regular hexagon.
Further, the second flue section is arranged in smoke inlet in the vertical tank, and the second flue section is in direction of fall
Setting, flue gas is obliquely passed through with direction of fall to vertical tank；
Or, the vertical tank lower end is connected with a taper bucket, the capitate bucket lower end is connected with Weight type flapper；Institute
The Weight type flapper lower end stated is connected with collection ash can, after the dust in capitate bucket runs up to constant weight, locks through Weight type
Collection ash can is fallen into after gas device；
Or, the cyclone dust collectors are the tangentially connected composition of multiple Whirlwind cyclones, the cyclone dust collectors removal partial size is greater than 5
μm dust；
Or, the self-adaptive temperature adjust and the flue between ultrafine dust pre cleaning device and spray ammonia system in be equipped with
Deflector, it is described spray ammonia system and SCR reactor between flue in be provided with deflector.
Further, before flue gas selective catalytic reduction, flue gas is rear to enter adaptive temperature first through cyclone dust collectors dedusting
Degree adjusts and ultrafine dust pre cleaning device, removes ultrafine dust by sound wave generating device, realizes temperature certainly using heat storage
It adjusts, then enters SCR reactor after mixing with the ammonia of spray ammonia system supply and carry out denitration reaction.
Further, the heat storage 52 is by 40-50 parts of shale, 12-20 parts of lime, 6-10 parts of silicon carbide, Fe2O310-15
Part, Al2O310-15 parts, CaO10-15 parts, Na2O10-15 parts, 4-6 parts of water, through grinding, drying, sintering after preparing in proportion
After generate, specific heat capacity is 2.4-2.5KJ/ (KgK), carries out temperature adjusting and to the portion in flue gas to the flue gas for flowing through heat storage
Ultrafine dust is divided to be adsorbed.
Further, it includes being occurred by high sound pressure level, low frequency sound wave that sound wave generating device, which removes ultrafine dust process,
Device first realizes that dust is reunited, and carries out dust removing by the sonic generator of high sound pressure level, wide frequency ranges afterwards.
The method of denitration for selecting the above-mentioned SCR denitration device suitable for high concentrate dust, high-temperature fluctuation flue gas, in flue gas
Before selective catalytic reduction, flue gas enters self-adaptive temperature adjusting and ultrafine dust pre cleaning first through cyclone dust collectors dedusting afterwards
Device removes ultrafine dust by sound wave generating device, realizes temperature self adjusting using heat storage, then supplied with spray ammonia system
Enter SCR reactor after ammonia mixing and carries out denitration reaction.
Beneficial effects of the present invention are as follows: the present invention is adjusted by self-adaptive temperature and ultrafine dust pre cleaning device is to height
Concentration dust, high-temperature fluctuation flue gas enter back into the flue gas tune that SCR reactor can be big by temperature fluctuation range after being pre-processed
It saves between 320 DEG C -420 DEG C, the temperature window for the Medium temperature SCR catalyst that just coincide.Simultaneously self-adaptive temperature adjust and it is ultra-fine
Dust pre cleaning device can a large amount of ultrafine dust of pre cleaning, the present invention controlled by following manner into SCR reactor
Superfine powder dust quantity: firstly, most ultrafine dust reunite under the action of sound wave generating device at the top of vertical tank it is long greatly
Big partial size dust (partial size is at 10 μm or more), is secondly adsorbed on heat storage there are also small part ultrafine dust, after reunion is grown up
Dust and be directly adsorbed to heat storage dust it is clear under the action of sweep of gases and vertical pot bottom sound wave generating device
It removes.Ensure suitable into the flue-gas temperature of SCR reactor by above-mentioned technique and device and be greatly decreased containing superfine powder dust quantity,
To guarantee that catalyst denitration efficiency is chronically at higher level.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of embodiment 1；
Fig. 2 is deflector structure schematic diagram；
Fig. 3 is heat storage arrangement schematic diagram；
Fig. 4 is sound wave generating device arrangement schematic diagram；
In attached drawing, flue 1；Cyclone dust collectors 2；There is the special flue 3 of certain tilt angle；Sound wave generating device 4；First
Sonic generator 41；Second sonic generator 42；Self-adaptive temperature adjusts and ultrafine dust pre cleaning device 5；Vertical tank 51；It stores
Hot body 52；The taper bucket 6；Weight type flapper 7；Collect ash can 8；Deflector 9；Aperture 10；Spray ammonia system 11；SCR reactor 12.
Specific embodiment
Below in conjunction with drawings and examples, the present invention will be further described:
Embodiment 1:
In order to better illustrate application of this patent in industrial silicium mine hot stove, now it is with one, China somewhere mineral hot furnace
Example illustrates the extensive flue gas adaptability of this patent and efficient denitration efficiency.
One industrial silicium mine hot stove its typical flue gas characteristic: smoke property fluctuation has periodically, and a cycle is time-consuming
40 minutes about 2 hours；Temperature fluctuation range is at 200 DEG C -650 DEG C in monocycle, flue gas flow fluctuation range 150000m3-
200000m3；Contain the SILICA FUME that a large amount of particles are tiny in flue gas.
As shown in Figs 1-4, a kind of SCR denitration device suitable for high concentrate dust, high-temperature fluctuation flue gas of the invention,
Denitration is carried out for the flue gas to boiler, and the boiler has a flue 1 for discharging flue gas, and the flue 1 is in airflow direction
Cyclone dust collectors 2, self-adaptive temperature adjusting and ultrafine dust pre cleaning device 5 and SCR reactor 12 are set gradually, it is described adaptive
It answers temperature adjusting and ultrafine dust pre cleaning device 5 to lead on the flue of SCR reactor 12 and ammonia-gas spraying device is arranged.
Exiting flue gas after 2 dedusting of cyclone dust collectors, into self-adaptive temperature adjust and ultrafine dust pre cleaning device 5,
Adjustment temperature simultaneously removes ultrafine dust, then enters SCR reactor after mixing with the ammonia of spray ammonia system supply and carry out denitration reaction.
The present invention solves that certain Industrial Stoves exit gas temperature fluctuation ranges are big, are unable to satisfy SCR middle temperature catalyst
The problem of temperature window, while this technique and its device pre-process ultrafine dusts most in kiln gas, solve
A large amount of ultrafine dusts of having determined are adsorbed on the problem of catalyst surface causes catalytic efficiency to decline.
The self-adaptive temperature is adjusted and ultrafine dust pre cleaning device 5 includes at least 2 and concatenated contains special storage
The vertical tank 51 of hot body 52；The specific heat capacity of the heat storage 52 is 2.4-2.5KJ/ (KgK).
The heat storage 52 is by 40-50 parts of shale, 12-20 parts of lime, 6-10 parts of silicon carbide, Fe2O310-15 parts,
Al2O310-15 parts, CaO10-15 parts, Na2O10-15 parts, 4-6 parts of water, are ground after above-mentioned raw materials are prepared in proportion, are dried
It is obtained after dry, sintering, there is stronger adsorption capacity to the ultrafine dust of small particle.Special accumulation of heat physical efficiency is real in this structure
The temp regulating function of existing flue gas, can also adsorb the part ultrafine dust in flue gas.
It is the molding mode of regular hexagon that the heat storage 52, which selects horizontal section, and the heat storage 52 is piled up described vertical
In formula tank 51, and it is used as dilatation joint with 51 inner wall preset clearance of vertical tank.Arrangement of the heat storage 52 in vertical tank 51
Mode are as follows: neatly pile up from bottom to top in parallel, the arrangement mode, it is ensured that there are channel when dust is removed, also ensure compared with
Big heat exchange area；There are a fixed gaps for wall surface of the heat storage apart from vertical tank, as being dilatation joint, to adapt to accumulation of heat
Temperature caused volume change when changing.It is 12m × 12m × 14m that heat storage, which piles up mode, in single vertical tank.
The vertical tank 51 equipped with heat storage 52 is internally provided with sound wave generating device 4, and sound wave generating device 4 is used for
The ultrafine dust that reunite in the flue gas dust grown up and heat storage 52 adsorb is removed, the sound wave generating device setting is described vertical
The lower end in flow of flue gas direction in formula tank 51.The sound wave generating device 4 includes multiple sonic generators, and sonic generator is equipped with
It is multiple, it is evenly distributed in vertical tank 51.
The vertical tank 51 is at least provided with two；
The vertical tank 51 is arranged sound wave generating device 4, and the sound wave generating device 4 includes the at the top of vertical tank
One sonic generator 41 and the second sonic generator 42 positioned at vertical tank lower end；
There is the sound wave that first sonic generator 41 occurs high sound pressure level, low-frequency characteristic to reunite for dust；
Second sonic generator 42 selects the sonic generator of high sound pressure level, wide frequency ranges to remove for dust.
The sound wave generating device includes the first sonic generator 41 at the top of vertical tank, the sound wave tool generated
There are high sound pressure level, low-frequency characteristic, agglomeration is played to the ultrafine dust in flue gas, can reduce the number of ultrafine dust
Concentration is conducive to remove, and the sonic generator is by the way of continuous work；The sound wave generating device further includes being located at second
Second sonic generator 42 of a vertical tank (from flow of flue gas direction) lower end, the sound wave generated have high sound pressure level, wideband
The characteristic of rate range plays scavenging effect to the ultrafine dust being adsorbed on heat storage, which uses discontinuous operation
Mode, every group alternately occur sound wave.
51 lower end of vertical tank is connected with a taper bucket 6, and the taper bucket angle is about 75 °；6 lower end of capitate bucket connects
It is connected to Weight type flapper 7；7 lower end of Weight type flapper is connected with collection ash can 8, and sound wave generating device 4 is removed super
Fine dust is slowly fallen in capitate bucket 6, after the dust in capitate bucket 6 runs up to constant weight, after Weight type flapper 7
Fall into collection ash can 8.
In the present invention, the gas inlet of the vertical tank 51 is arranged below, the gas inlet connection of the vertical tank 51
Second flue section 3, and flue gas is passed through by the second flue section 3, described second flue section, 3 one end is connected to flue 1, and the other end is passed through
Dust is obliquely sent into the flue gas of vertical tank 51 in direction of fall by the gas inlet of vertical tank 52, the second flue section 3
Import.
Second flue section 3 is one section of special flue, has certain inclination angle, and inclination angle is 30 ° in the present embodiment, is avoided
Ultrafine dust backs into inlet flue duct.
In this structure, flue gas introduces cyclone dust collectors 2 through flue 1, and the cyclone dust collectors 2 are that multiple Whirlwind cyclones are tangential
Connection composition, most partial sizes are removed in 5 μm or more of dust after cyclone dust collectors 2.Dust passes through Electrostatic Absorption
Effect is adsorbed onto body surface, and the metal oxide in heat storage 52 enhances heat storage to partial size in 5 μm of superfine powders below
The adsorption capacity of dirt.
The spray ammonia system 11 is entered in flue 1 by aperture 10.
It is equipped in flue between the self-adaptive temperature adjusting and ultrafine dust pre cleaning device 5 and spray ammonia system 11
Deflector 9, it is described spray ammonia system 11 and SCR reactor 12 between flue in be provided with deflector 9, enable mixed gas
Enter SCR reactor evenly, improves reaction completeness.
The method of denitration of the SCR denitration device of high concentrate dust, high-temperature fluctuation flue gas is applicable in using present invention offer, it can
To realize the automatic adjusument of flue-gas temperature, guarantee flue-gas temperature be chronically in the temperature window of middle temperature catalyst (320 DEG C-
420℃)；The ultrafine dust in flue gas can be effectively reduced, guarantees denitration efficiency.
The specific heat capacity of heat storage 52 in the present invention is 2.4-2.5KJ/ (KgK), higher than common refractory fireclay block 1-
1.05KJ/ (KgK), therefore the heat storage is a kind of ideal self-adaptive temperature adjusting carrier.
It is adjusted by heat storage 51, (temperature range is approximately located i 100 DEG C -700 DEG C to the Industrial Stoves of Temperature cycling fluctuation
Between) exit gas temperature can be automatically adjusted in the range of 320 DEG C -420 DEG C.One kind of the invention is suitable for high concentration powder
The method of denitration of the SCR denitration device use of dirt, high-temperature fluctuation flue gas are as follows: when flue gas is in elevated temperature cycles, by adaptive
When temperature-adjusting device, transfer heat to self-adaptive temperature regulating device, heat by self-adaptive temperature regulating device accumulation of heat
Body storage, by heat exchange, flue-gas temperature is reduced to 420 DEG C or less；When kiln gas is within the low temperature period, flue gas passes through adaptive
Temperature-adjusting device, the heat transfer that self-adaptive temperature regulating device stores heat storage is to flue gas, by heat exchange, flue-gas temperature
It is increased to 320 DEG C or more.
Flue gas after cyclone dust collectors 2 by after the second flue section 3 with certain tilt angle from bottom to up
Into self-adaptive temperature adjust and ultrafine dust pre cleaning device 5, self-adaptive temperature adjust and ultrafine dust pre cleaning device 5 to
Include less two groups of concatenated vertical tanks, more strengthens to a step its accumulation of heat deashing ability.
Beneficial effects of the present invention are as follows: the present invention is adjusted by self-adaptive temperature and ultrafine dust pre cleaning device is to height
Concentration dust, high-temperature fluctuation flue gas enter back into the flue gas tune that SCR reactor can be big by temperature fluctuation range after being pre-processed
It saves between 320 DEG C -420 DEG C, the temperature window for the Medium temperature SCR catalyst that just coincide.Simultaneously self-adaptive temperature adjust and it is ultra-fine
Dust pre cleaning device can remove a large amount of ultrafine dust, so that the dust into SCR reactor largely reduces, guarantee catalysis
Agent denitration efficiency is in higher level.
As shown in Figure 1, for a kind of SCR denitration process and its device for fluctuating flue gas suitable for high concentrate dust, high-temperature,
It includes flue 1, cyclone dust collectors 2, self-adaptive temperature adjusts and ultrafine dust pre cleaning device 5, spray ammonia system 11 and SCR are anti-
Answer device 12.
The cyclone dust collectors 2 are the tangentially connected composition of multiple Whirlwind cyclones, and the exiting flue gas of industrial silicium mine hot stove is through overwinding
Most partial sizes are removed in 5 μm or more of dust after wind deduster 2.
The self-adaptive temperature is adjusted and ultrafine dust pre cleaning device 5 includes at least 2 and concatenated contains special storage
The vertical tank 51 of hot body 52.Special heat storage 52 is by including that the raw material of following weight fraction is prepared: 40-50 parts of shale,
12-20 parts of lime, 6-10 parts of silicon carbide, Fe2O310-15 parts, Al2O310-15 parts, CaO10-15 parts, Na2O10-15 parts, water 4-
6 parts.The heat storage is obtained after above-mentioned raw materials are prepared in proportion after grinding, drying, sintering.
A kind of typical molding standard of the heat storage is regular hexagon, inscribed circle diameter 210mm, 19 holes, aperture
30mm, thickness 120mm；Arrangement mode of the heat storage in vertical tank is as shown in Figure 3: parallel neat heap from bottom to top
It builds, the arrangement mode, it is ensured that there are channels when dust is removed, and also ensure biggish heat exchange area；The heat storage
For wall surface apart from vertical tank there are a fixed gap, being used as is dilatation joint, and caused volume becomes when adapting to regenerator temperature variation
Change.It is 12m × 12m × 14m that heat storage, which piles up mode, in single vertical tank.
The specific heat capacity of the heat storage is 2.4-2.5KJ/ (KgK), higher than common refractory fireclay block 1-1.05KJ/
(Kg·K).It by heat storage adjusts, the mineral hot furnace exit gas temperature of -650 DEG C of cyclic fluctuations at 200 DEG C can be adaptive
It adjusts with answering in the range of 320 DEG C -420 DEG C.Its principle is: flue gas is adjusted by self-adaptive temperature and is filled in elevated temperature cycles
When setting, self-adaptive temperature regulating device is transferred heat to, through exchanging heat, flue-gas temperature is reduced to 420 DEG C or less；Work as kiln gas
Within the low temperature period, flue gas transfers heat to flue gas by self-adaptive temperature regulating device, self-adaptive temperature regulating device, into
Heat exchange, flue-gas temperature are increased to 320 DEG C or more.Metal oxide in heat storage enhances heat storage to partial size at 5 μm or less
Dust adsorption capacity.
The vertical tank gas inlet equipped with heat storage passes through one section of second flue section 3, the second flue section 3
Inclination angle is 30 °, avoids dust and backs into inlet flue duct；The vertical tank equipped with heat storage is internally provided with sound wave
Generating device 4.The sound wave generating device 4 includes being located at the first sonic generator 41 at the top of vertical tank, the sound wave generated
With high sound pressure level, low-frequency characteristic, such as suitable for the sonic generator frequency of sound wave 1200Hz- of industrial silicium mine hot stove
1400Hz, sound pressure level 135dB-155dB play agglomeration to the dust in flue gas, can reduce the number concentration of dust, benefit
In removing, which makes the company of sending at the top of entire vertical tank in two groups that top layout is side by side, every group of alternation
Continuous property sound wave；The sound wave generating device 4 further includes the second sonic generator 42 positioned at vertical tank lower end, the sound generated
Wave has the characteristic of high sound pressure level, wide frequency ranges, can select the sonic generator sound wave frequency suitable for industrial silicium mine hot stove
Band 30-2100Hz, sound pressure level 125W-153W, play scavenging effect to the dust being adsorbed on heat storage, which adopts
With the mode of discontinuous operation: a kind of typical working method is to work 1 minute at interval of 10 minutes, repeatedly.
The arrangement of sound wave generating device 4 is as shown in figure 4, the arrangement guarantees that acoustic wave ash ejector working area can cover
Cover entire vertical tank range.The a large amount of superfine powders contained in flue gas are rolled into a ball under the action of the first sonic generator 41 at the top of vertical tank
It is poly- to grow up, it is secondly adsorbed on heat storage there are also small part ultrafine dust, reuniting the dust after growing up and is directly adsorbed to store
The dust of hot body is removed under the action of sweep of gases and vertical pot bottom rising tone wave producer 42.
The vertical tank lower end is connected with a taper bucket 6, and 6 angle of the taper bucket is about 75 °；6 lower end of capitate bucket
It is connected with Weight type flapper 7；7 lower end of Weight type flapper is connected with collection ash can 8.When the dust product in capitate bucket 6
After tiring out constant weight, collection ash can 8 is fallen into after Weight type flapper 7.
The spray ammonia system 11 is entered in flue 1 by aperture 10.The self-adaptive temperature adjusts and superfine powder
Water conservancy diversion is provided in flue between dirt pre cleaning device 5 and spray ammonia system 11 between spray ammonia system 11 and SCR reactor 12
Plate 9 enables mixed gas evenly into SCR reactor 12.Deflector structure is as shown in Figure 2.
Verified, when the exiting flue gas of mineral hot furnace is directly entered SCR reactor 12, system denitration efficiency is with runing time
Increase, denitration efficiency is lower and lower, is about reduced to 30% or so from 80%, and in fume high-temperature section, can make being higher than 420 DEG C
At catalyst inactivation；After adjusting denitrating technique using the self-adaptive temperature of this patent, system denitration efficiency can be maintained at for a long time
70% or more.
Above content described in this specification is only illustration made for the present invention.Affiliated skill in the present invention
The technical staff in art field can do various modifications or additions or using similar to described specific implementation case
Mode substitutes, content without departing from specification in the present invention or beyond the scope defined by this claim, should all
Belong to the protection scope in the present invention.
Claims (10)
1. a kind of SCR denitration device suitable for high concentrate dust, high-temperature fluctuation flue gas, cooperation boiler use and to its flue gas
Carry out denitration, it is characterised in that: set gradually cyclone dust collectors for preliminary dust removal, self-adaptive temperature tune in flow of flue gas direction
Section and ultrafine dust pre cleaning device are adaptively to regulate and control flue-gas temperature and remove ultrafine dust and SCR denitration reaction device for taking off
Except NOx, the self-adaptive temperature is adjusted and ultrafine dust pre cleaning device leads to arranging spray ammonia dress on the flue of SCR reactor
It sets；The self-adaptive temperature adjust and ultrafine dust pre cleaning device include vertical tank, the heat storage being laid in vertical tank and
Sound wave generating device, temperature realizes automatic adjusument when flue gas flows through heat storage in vertical tank and part ultrafine dust is by heat storage
Absorption, while being disposed in the sound wave generating device in vertical tank and being reunited to ultrafine dust, removed.
2. the SCR denitration device suitable for high concentrate dust, high-temperature fluctuation flue gas, feature exist as described in claim 1
In: the vertical tank is at least provided with two；
Sound wave generating device is set in the vertical tank, the sound wave generating device includes the first sound wave hair at the top of vertical tank
Raw device and the second sonic generator positioned at vertical tank lower end；
There is the sound wave that first sonic generator occurs high sound pressure level, low-frequency characteristic to reunite for dust；
Second sonic generator selects the sonic generator of high sound pressure level, wide frequency ranges to remove for dust.
3. the SCR denitration device suitable for high concentrate dust, high-temperature fluctuation flue gas, feature exist as claimed in claim 2
In: it is 1200Hz-1400Hz, sound pressure level 135dB-155dB that first sonic generator, which selects sonic generator frequency of sound wave,；
Or, first sonic generator is arranged side by side two groups, every group alternately occurs sound wave.
4. the SCR denitration device suitable for high concentrate dust, high-temperature fluctuation flue gas as claimed in claim 2 or claim 3, feature
It is: the second sonic generator sonic generator sound wave frequency band 30-2100Hz, sound pressure level 125W-153W；
Or, second sonic generator selects service intermittent that sound wave occurs.
5. the SCR denitration for being suitable for high concentrate dust, high-temperature fluctuation flue gas as described in claim 1-3 any claim
Device, it is characterised in that: the specific heat capacity of the heat storage is 2.4-2.5KJ/ (KgK).
6. the SCR denitration device suitable for high concentrate dust, high-temperature fluctuation flue gas, feature exist as claimed in claim 5
In: the heat storage is by 40-50 parts of shale, 12-20 parts of lime, 6-10 parts of silicon carbide, 10-15 parts of Fe2O3, Al2O3 10-15
Part, 10-15 parts of CaO, 10-15 parts of Na2O, 4-6 parts of water, generate after grinding, drying, sintering after preparing in proportion；Or,
The heat storage is parallel, neatly piles up in vertical tank, and is used as the dilatation joint of heat storage with vertical top tank structure preset clearance；
Or, the heat storage selects regular hexagon.
7. the SCR suitable for high concentrate dust, high-temperature fluctuation flue gas as described in claim 1-3,6 any claims is de-
Nitre device, it is characterised in that: the second flue section is arranged in smoke inlet in the vertical tank, and the second flue section is in direction of fall
Setting, flue gas is obliquely passed through with direction of fall to vertical tank；
Or, the vertical tank lower end is connected with a taper bucket, the capitate bucket lower end is connected with Weight type flapper；Described
Weight type flapper lower end is connected with collection ash can, after the dust in capitate bucket runs up to constant weight, through Weight type flapper
After fall into collection ash can；
Or, the cyclone dust collectors are the tangentially connected composition of multiple Whirlwind cyclones, the cyclone dust collectors removal partial size is greater than 5 μm
Dust；
Or, the flue between the self-adaptive temperature adjusting and ultrafine dust pre cleaning device and spray ammonia system is interior equipped with water conservancy diversion
Plate, it is described spray ammonia system and SCR reactor between flue in be provided with deflector.
8. selecting the SCR denitration device for being suitable for high concentrate dust, high-temperature fluctuation flue gas described in any of the above-described claim
Method of denitration, it is characterised in that: before flue gas selective catalytic reduction, flue gas first through cyclone dust collectors dedusting, it is rear enter from
Adaptive temperature adjusts and ultrafine dust pre cleaning device, removes ultrafine dust by sound wave generating device, is realized using heat storage
Temperature self adjusting, then enter SCR reactor after mixing with the ammonia of spray ammonia system supply and carry out denitration reaction.
9. the denitration side of the SCR denitration device of flue gas is fluctuated suitable for high concentrate dust, high-temperature as claimed in claim 8
Method, it is characterised in that: the heat storage 52 is by 40-50 parts of shale, 12-20 parts of lime, 6-10 parts of silicon carbide, Fe2O3 10-15
Part, 10-15 parts of Al2O3,10-15 parts of CaO, 10-15 parts of Na2O, 4-6 parts of water, after preparing in proportion through grinding, drying,
It is generated after sintering, specific heat capacity is 2.4-2.5KJ/ (KgK), carries out temperature adjusting to the flue gas for flowing through heat storage and in flue gas
Part ultrafine dust adsorbed.
10. the denitration of the SCR denitration device of flue gas is fluctuated suitable for high concentrate dust, high-temperature as claimed in claim 8 or 9
Method, it is characterised in that: it includes passing through high sound pressure level, low frequency sonic generator that sound wave generating device, which removes ultrafine dust process,
It first realizes that dust is reunited, dust removing is carried out by the sonic generator of high sound pressure level, wide frequency ranges afterwards.
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Application publication date: 20191029 |