CN106621752A - Fume denitration device for aluminum oxide suspension calcinator and use method thereof - Google Patents
Fume denitration device for aluminum oxide suspension calcinator and use method thereof Download PDFInfo
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- CN106621752A CN106621752A CN201611208024.1A CN201611208024A CN106621752A CN 106621752 A CN106621752 A CN 106621752A CN 201611208024 A CN201611208024 A CN 201611208024A CN 106621752 A CN106621752 A CN 106621752A
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- Prior art keywords
- roasting
- flue gas
- stove
- reactor
- cyclone separator
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- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 239000000725 suspension Substances 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 11
- 239000003517 fume Substances 0.000 title abstract 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 41
- 239000007788 liquid Substances 0.000 claims abstract description 28
- 239000003054 catalyst Substances 0.000 claims abstract description 16
- 238000001816 cooling Methods 0.000 claims abstract description 12
- 239000003546 flue gas Substances 0.000 claims description 59
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 58
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 51
- 239000000243 solution Substances 0.000 claims description 50
- 239000003814 drug Substances 0.000 claims description 36
- 229940079593 drug Drugs 0.000 claims description 36
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 24
- 229910021529 ammonia Inorganic materials 0.000 claims description 21
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims description 20
- 239000004202 carbamide Substances 0.000 claims description 20
- XSQUKJJJFZCRTK-UHFFFAOYSA-N urea group Chemical group NC(=O)N XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 20
- 238000001914 filtration Methods 0.000 claims description 17
- 238000006243 chemical reaction Methods 0.000 claims description 12
- 229910052757 nitrogen Inorganic materials 0.000 claims description 12
- 239000004071 soot Substances 0.000 claims description 8
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims description 6
- 229910021502 aluminium hydroxide Inorganic materials 0.000 claims description 6
- 239000007789 gas Substances 0.000 claims description 6
- 238000004176 ammonification Methods 0.000 claims description 5
- 238000000889 atomisation Methods 0.000 claims description 5
- 238000005243 fluidization Methods 0.000 claims description 5
- 238000012544 monitoring process Methods 0.000 claims description 4
- 230000008676 import Effects 0.000 claims description 3
- 230000035484 reaction time Effects 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- 239000003186 pharmaceutical solution Substances 0.000 claims description 2
- 239000000126 substance Substances 0.000 abstract description 2
- 238000001354 calcination Methods 0.000 abstract 8
- 239000000428 dust Substances 0.000 description 7
- 238000002485 combustion reaction Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 239000004411 aluminium Substances 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical group S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- -1 flue gas Nitrogen oxides Chemical class 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000012089 stop solution Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/75—Multi-step processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/12—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces
- B01D45/16—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces generated by the winding course of the gas stream, the centrifugal forces being generated solely or partly by mechanical means, e.g. fixed swirl vanes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8628—Processes characterised by a specific catalyst
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2256/00—Main component in the product gas stream after treatment
- B01D2256/10—Nitrogen
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Treating Waste Gases (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The invention discloses a fume denitration device for an aluminum oxide suspension calcinator and a use method of the fume denitration device. The denitration device comprises a calcining main furnace, one side of the calcining main furnace is connected onto a cooling cyclone separator, the other side of the calcining main furnace is connected onto a roasting auxiliary furnace, hot air exhausted from the cooling cyclone separator is divided and enters a first branch pipe and a second branch pipe, the first branch pipe is connected to the bottom of the calcining main furnace, the tail end of the second branch pipe is connected with an air nozzle, the air nozzle is arranged in the middle of the calcining main furnace, the second branch pipe is provided with a louver electric valve, an atomizing nozzle is arranged above the air nozzle and is connected with a compressed air pipe and a liquid adding pipe to allow a chemical solution to be added in the calcining main furnace and react in the calcining main furnace, the rear end of the calcining auxiliary furnace is connected with a preheating cyclone separator, an air outlet pipe of the preheating cyclone separator is connected with a reactor, and the reactor is filled with a catalyst to denitrate the high-temperature flue containing ammonia gas in the reactor. The denitration device is high in denitration efficiency, the content of NOx in the flue exhausted in the atmosphere is greatly reduced, the heat consumed by aluminum oxide is reduced, and the cost is reduced.
Description
Technical field
The invention belongs to aluminum oxide industry technology and field of environment engineering, more particularly to a kind of Suspension Roaster for Aluminium Oxide cigarette
Gas denitrification apparatus and its using method.
Background technology
Industry is prepared in aluminum oxide, aluminium hydroxide is provided in the thermal source needed for roasting process by fuel combustion, fuel combustion
N during burning, in fuel2With the N in air2Oxidation at high temperature produces NOx, and NOx is primarily referred to as NO, NO2And N2O3Etc. nitrogen oxidation
Thing.The harmfulness of NOx is not only in that it is sour gas, and NO can significantly damage the ozone layer, NO and NO2It is also simultaneously greenhouse
Gas, NO and hydrocarbon react under effect of sunlight and cause photochemical pollution, to the toxic effect of human body.
300～400mg/Nm of NOx content in the flue gas that current roaster is produced3, as Environmental administers more next
More strictly it is necessary to being removed to the NOx in flue gas.Therefore, it is necessary to develop a kind of denitrification apparatus, aluminum oxide is not being affected
On the premise of amount, NOx is effectively administered.
The content of the invention
For the problem that prior art is present, the present invention provides one kind and denitration process can be carried out to flue gas, reduces flue gas row
Enter the Suspension Roaster for Aluminium Oxide equipment for denitrifying flue gas and its using method of amount of nitrogen oxides in air.
To achieve these goals, the present invention is adopted the following technical scheme that：
A kind of Suspension Roaster for Aluminium Oxide equipment for denitrifying flue gas, including the main stove of roasting, the side connection of the main stove of the roasting
In cooling cyclone separator, opposite side is connected to roasting pair stove, the hot-air shunting difference that the cooling cyclone separator is discharged
Into tie point pipe and the second bypass duct, the tie point pipe is connected to the bottom of the main stove of the roasting, described second
Road pipe end is connected with tuyere, and the tuyere is arranged at the middle part of the main stove of the roasting, and second bypass duct is provided with blinds
Window motor-driven valve, the main stove of the roasting is additionally provided with atomizer above the tuyere, and it is empty that the atomizer is connected to compression
Tracheae and liquid-feeding tube, for adding the main reaction in furnace of the roasting, the roasting pair stove rear end to be connected with preheating rotation for drug solns
Wind separator, the discharge pipe of the pre- hot cyclone separator is connected to reactor, the reactor built with catalyst, for supplying
The denitration in the reactor of high-temperature flue gas containing ammonia, the bottom of the reactor is connected to drier.
Further, the tuyere or/and the atomizer are provided with multiple, and circular is arranged at the roasting main stove week
Enclose, and be communicated in the main furnace interior of the roasting.
Further, the liquid-feeding tube is connected to measuring pump, and the measuring pump is connected to solution reservoir, and the solution reservoir connects
Filtering tank is connected to, the filtering tank is connected to solution pump, and the solution pump is connected to molten drug slot, and the molten drug slot is used to match somebody with somebody pharmacy
Solution simultaneously supplies the liquid-feeding tube.
Further, the first valve group, the solution reservoir and the metering are provided between the measuring pump and the liquid-feeding tube
The second valve group is provided between pump, the 3rd valve group is provided between the filtering tank and the solution pump, the solution pump is molten with described
The 4th valve group is provided between drug slot.
Further, the molten thing of institute is urea in the molten drug slot.
Further, dashpot is connected with below the roasting pair stove, for entering for the aluminum oxide in roasting pair stove
Enter to extend the reaction time, the dashpot is connected to fluidisation airduct.
Further, the reactor is connected with multiple acoustic wave soot blowers, and the acoustic wave soot blower is connected to air reservoir.
Further, differential manometer is provided between the import and export of the reactor, the reactor outlet is connected with nitrogen oxides
Monitor and ammonia monitor.
A kind of using method based on above-mentioned Suspension Roaster for Aluminium Oxide equipment for denitrifying flue gas, including：
The main stove of normally-open roasting and roasting pair stove, when temperature is reached in the main stove of certain backward roasting hydroxide is added
Aluminium, when stable yield, adjusts the shutter motor-driven valve, the hot-air shunting part discharged by the cooling cyclone separator
Into the main stove middle part of the roasting, air capacity of the control into the main furnace bottom of the roasting；
Drug solns are passed through into the liquid-feeding tube, drug solns enter the main stove of the roasting after the atomizer is atomization
It is interior, meet high-temperature flue gas and chemical reaction denitration occurs；
Enter in the pre- hot cyclone separator after the main stove of reacted flue gas roasting described in, roasting pair stove and divide
From discharge pipe described in the high-temperature flue gas Jing containing ammonia is entered in the reactor after separation, is occurred in the presence of catalyst
Reaction denitration, the flue gas after denitration enters the drier.
Further, the drug solns are urea liquid, and urea liquid is met high-temperature flue gas and is decomposed ammonification, in high-temperature flue gas
Nitrogen oxides generates nitrogen and vapor with ammonia reaction, and the high-temperature flue gas containing ammonia react generation nitrogen in the presence of catalyst
Gas and vapor.
Beneficial effects of the present invention：
Part hot-air is shunted by adjusting the aperture of shutter motor-driven valve, tie point pipe can be reduced into roasting master
The air capacity of furnace bottom, reaches few oxygen burning, reduces the NOx that the main furnace bottom burning of roasting is produced, and the flue gas containing NOx is with oxygen
Change aluminium powder to rise in the main stove of roasting, the drug solns for coming from liquid-feeding tube are decomposed ammonification, high-temperature flue gas by the high-temperature flue gas of rising
In the reaction of NOx and ammonia produce nitrogen and vapor, denitration can be carried out.And the high-temperature flue gas containing surplus ammonia enter reaction
During device, react generation nitrogen and vapor in the presence of catalyst in reactor, further denitration.Above-mentioned denitrification apparatus
Denitration rate is high, and denitration twice can be greatly lowered NOx content in the flue gas for enter air, and reduce aluminum oxide heat dissipation, drop
Low cost.
Description of the drawings
Fig. 1 is the structural representation of Suspension Roaster for Aluminium Oxide equipment for denitrifying flue gas of the present invention；
In figure, 1-cooling cyclone separator, 2-tie point pipe, the 3-the second bypass duct, 4-shutter motor-driven valve,
5-tuyere, the main stove of 6-roasting, 7-liquid-feeding tube, 8-atomizer, 9-compressed air hose, the 10-the first valve group, 11-metering
Pump, the 12-the second valve group, 13-solution reservoir, 14-filtering tank, the 15-the three valve group, 16-solution pump, the 17-the four valve group,
18-molten drug slot, 19-fluidisation airduct, 20-dashpot, 21-roasting pair stove, 22-pre- hot cyclone separator, 23-air-out
Pipe, 24-reactor, 25-acoustic wave soot blower, 26-air reservoir, 27-catalyst, 28-drier, 29-differential pressure liquid level
Meter, 30-differential manometer, 31-monitoring nitrogen oxide instrument, 32-ammonia monitor.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment a part of embodiment only of the invention, rather than the embodiment of whole.Base
Embodiment in the present invention, those of ordinary skill in the art obtained under the premise of creative work is not made it is all its
His embodiment, belongs to the scope of protection of the invention.
Such as Fig. 1, a kind of Suspension Roaster for Aluminium Oxide equipment for denitrifying flue gas of present invention offer, including the main stove 6 of roasting, roasting master
The side of stove 6 is connected to cooling cyclone separator 1, and opposite side is connected to roasting pair stove 21, cools down the heat that cyclone separator 1 is discharged
Air flow respectively enters the bypass duct 3 of tie point pipe 2 and second, and tie point pipe 2 is connected to the bottom of the main stove 6 of roasting, makes
Obtain hot-air and provide air for the roasting of aluminium hydroxide at the combustion chamber V19 of the main bottom of stove 6 of roasting.Second bypass duct 3 sets
The top of tie point pipe 2 is placed in, the middle part of the main stove 6 of roasting is connected to, the end of the second bypass duct 3 is connected with tuyere 5, tuyere 5
It is communicated in inside the main stove 6 of roasting, for the main middle part of stove 6 of roasting hot-air is provided.Tuyere 5 is provided with multiple, and circular is arranged on roasting
Around main stove 6, in the present embodiment, tuyere 5 is provided with three.Second bypass duct 3 is provided with shutter motor-driven valve 4, by adjusting
The aperture of shutter motor-driven valve 4 adjusting the quantity of hot air in the second bypass duct 3, so as to adjust bottom into tie point pipe 2
Air capacity in supply lower combustion chamber V19, reaches few oxygen burning, reduces NOx in the flue gas of roasting generation, subtracts from source
The generation of few NOx.
The main stove 6 of roasting is additionally provided with atomizer 8 in the top of tuyere 5, and atomizer 8 is connected to compressed air hose 9 simultaneously
With liquid-feeding tube 7, compressed air hose 9 is that atomizer 8 provides compressed air, and liquid-feeding tube 7 is used to add the main stove 6 of roasting for drug solns
It is interior to react with combustion product gases therein.Atomizer 8 is provided with multiple, and circular is arranged at around the main stove 6 of roasting, and is communicated in roasting
Burn inside main stove 6, the drug solns for being added liquid-feeding tube 7 by atomizer 8 are atomized.Liquid-feeding tube 7 is connected to measuring pump 11, metering
The first valve group 10 is provided between pump 11 and the liquid-feeding tube 7, measuring pump 11 is connected to solution reservoir 13, solution reservoir 13 and metering
The second valve group 12 is provided between pump 11, solution reservoir 13 is connected to filtering tank 14, and filtering tank 14 is connected to solution pump 16, solution pump
The 3rd valve group 15 is provided between 16 and filtering tank 14, solution pump 16 is connected to molten drug slot 18, between molten drug slot 18 and solution pump 16
The 4th valve group 17 is provided with, molten drug slot 18 is used for Pharmaceutical solutions and supplies liquid-feeding tube 7.By control above-mentioned first valve group 10, the
The path of supply liquid-feeding tube 7 can be cut off or be opened to two valve groups 12, the 3rd valve group 15 or the 4th valve group 17.In wherein molten drug slot 18
Agitator is provided with, in the present embodiment, the molten thing of institute is urea in molten drug slot 18, and urea is configured to concentration and is in molten drug slot 18
The drug solns of 15%-20%, in other embodiments, or ammoniacal liquor or other solution, can decompose ammonification by high-temperature flue gas
.Drug solns are pumped in filtering tank 14 by solution pump 16 and filtered, and filtering tank 14 filters the water-insoluble in drug solns, filtering tank
Automatic anti-washer, the impurity accumulated in periodic cleaning filter core are provided with 14.Drug solns after filtration are entered in solution reservoir 13,
Solution reservoir 13 is provided with pressure reduction liquid level gauge 29, stops after liquid level reach a certain height the high limit signal for obtaining pressure reduction liquid level gauge 29
Only solution pump 16.Reached by the regulating liquid inventory of measuring pump 11 and enter after certain value atomizer 8, by the mist of atomizer 8
Enter after change in the main furnace chamber of stove 6 of roasting and participate in the purpose that series of chemical reaches removing NOx.When liquid level in solution reservoir 13
During less than certain value, lower bound signal is sent to solution pump 16 by pressure reduction liquid level gauge 29, solution pump 16 continues into solution reservoir 13
Drug solns are pumped into, solution pump 16 stops when liquid level reaches maximum limit in solution reservoir 13, repeat this step, can be solution
The sustainable supply drug solns of storage tank 13.The urea liquid of atomization is met the flue gas that temperature is 980 DEG C in the main stove 6 of roasting and decomposes ammonification
Gas, ammonia generates nitrogen and vapor with the NOx reactions in flue gas, so as to denitration.
The rear end of the main stove 6 of roasting is connected to roasting pair stove 21, and the lower section of roasting pair stove 21 is connected with dashpot 20, dashpot 20
It is connected to fluidisation airduct 19, the outlet connection cooling system of dashpot 20.Oxidation is formed in the main stove 6 of roasting after aluminium hydroxide burning
Aluminium, aluminum oxide enters roasting in roasting pair stove 21 with air-flow, and sintering temperature can be reduced in the main stove 6 of roasting, and aluminum oxide is in roasting
Enter after roasting in dashpot 20 in secondary stove 21 and continue to react, the reaction time of aluminum oxide is extended by dashpot 20, can either
Reach original roasting effect, additionally it is possible to reduce sintering temperature, reduce aluminum oxide heat dissipation, the heat dissipation of saving is deducted needed for denitration
Cost after also save, aluminum oxide per ton saves 6 yuan, therefore reduces cost.
Roasting pair stove 21 rear end is connected with pre- hot cyclone separator 22, and the discharge pipe 23 of pre- hot cyclone separator 22 is connected to
Reactor 24, reactor 24 built with catalyst 27, for supplying the denitration in reactor 24 of the high-temperature flue gas containing ammonia.Reaction
The bottom of device 24 is connected to drier 28, and in the present embodiment, drier 28 is venturi drier.The main stove 6 of roasting, roasting pair
The high-temperature flue gas containing surplus ammonia, NOx that stove 21 and pre- hot cyclone separator 22 are excluded enter reactor 24, in catalyst 27
Effect is lower to react with air：
4NO+4NH3+O2→4N2+6H2O
4NO2+2NH3+O2→3N2+6H2O
Generate nitrogen and vapor, further denitration.By above-mentioned denitration twice, total denitration rate reaches 75%-90%, row
Enter NOx content in the flue gas of air and be reduced to 50-100mg/Nm3.Multiple acoustic wave soot blowers 25, sound are also associated with reactor 24
Ripple dust remover 25 is connected to air reservoir 26, and due to containing aluminum oxide dust in flue gas, long time integration can blocking catalyst 27
Gap passage, using the periodic cleaning of acoustic wave soot blower 25 aluminum oxide dust in the gap of catalyst 27 is accumulated in, in order to avoid affect to urge
The activity of agent 27 and increase SR.Differential manometer 30 is provided between the import and export of reactor 24, is monitored instead by the differential manometer 30
The laying dust situation in device 24 is answered, when the inlet outlet pressure differential of reactor 24 increases to certain value, it is clear that differential manometer 30 issues instructions to sound wave
Grey device 25 carries out deashing, and pressure reduction stops deashing when being reduced to initial value, repeat this step, and the laying dust in reactor 24 is carried out clearly
Remove.The outlet of reactor 24 is connected with monitoring nitrogen oxide instrument 31 and ammonia monitor 32, monitors the ammonia in flue gas nitrogen after denitration and contains
Amount, the drug solns addition of liquid-feeding tube 7 in the main stove 6 of roasting is adjusted by monitoring numerical value herein, and adds the main stove of roasting
The hot-air content of 6 bottoms so that denitration effect reaches best.
The present invention also provides a kind of using method based on above-mentioned Suspension Roaster for Aluminium Oxide equipment for denitrifying flue gas, including：
Early-stage preparations：Add into molten drug slot 18 after quantitative hot water, start the agitator of molten drug slot 18, to molten drug slot 18
Urea is inside added, solution is configured to into the urea liquid that concentration is 15%-20%, the urea liquid for preparing is through the 4th valve group
17th, filtering tank 14 is entered after the valve group 15 of solution pump 16 and the 3rd, filtering tank 14 filters the water-insoluble in urea liquid, after filtration
Urea liquid be sent to solution reservoir 13, the urea in solution reservoir 13 is detected by pressure reduction liquid level gauge 29 on solution reservoir 13
Capacity.When in solution reservoir 13 liquid level reach a certain height the high limit signal for obtaining pressure reduction liquid level gauge 29 after stop solution pump 16,
When liquid level is less than certain value in solution reservoir 13, lower bound signal is sent to solution pump 16, solution pump 16 by pressure reduction liquid level gauge 29
Continue to pump into urea liquid into solution reservoir 13, when liquid level reaches maximum limit in solution filling 13, solution pump 16 stops, weight
Multiple this step, can persistently supply urea solution for liquid-feeding tube 7.
Production process：The main stove 6 of normally-open roasting and roasting pair stove 21, when temperature is reached in the main stove 6 of certain backward roasting
Aluminium hydroxide is added, after aluminium hydroxide roasting in the main stove 6 of roasting forms aluminum oxide, as flue gas enters gas in roasting pair stove 21
Gu separating, the fluidisation airduct 19 of the bottom of dashpot 20 is opened when aluminum oxide is via roasting pair 21 bottom of stove.When yield reaches surely
After fixed, the aperture of shutter motor-driven valve 4 is adjusted, the hot-air shunting discharged by cooling cyclone separator 1 is partially into roasting master
The middle part of stove 6, control reaches few oxygen burning into the air capacity in main bottom combustion chamber V19 of stove 6 of roasting, makes NOx in baking flue gas
Content reduce.
When aluminum oxide suspension roasting yield normally after start the first valve group 10, the second valve group 12 and measuring pump 11, adjust stream
Urea liquid in solution reservoir 13 is added liquid-feeding tube 7 by amount up to after certain value, and into atomizer 8, urea liquid and pressure
Contracting air is atomization in atomizer 8, and the urea liquid of atomization is met the flue gas that temperature is 980 DEG C in the main stove 6 of roasting and decomposed
Into ammonia, ammonia generates nitrogen and vapor with the NOx reactions in flue gas, reaches the purpose of denitration.
Enter after fired main stove 6, the roasting pair stove 21 of reacted flue gas and separated in preheating cyclone separator 22, after separation
High-temperature flue gas Jing discharge pipes 23 containing ammonia are entered in reactor 24, and react generation nitrogen in the presence of catalyst 27
And vapor, further denitration, the flue gas after denitration is into drier 28.It is logical in the gap of catalyst 27 after a period of time
A certain amount of aluminum oxide dust is have accumulated in road, differential manometer 30 monitors that the pressure reduction that reactor 24 is imported and exported is reached after certain value,
Sending instruction unlatching acoustic wave soot blower 25 carries out deashing, so as to clean out the aluminum oxide dust being accumulated in the gap of catalyst 27,
In order to avoid affect the activity of catalyst 27 and increase SR.
The present invention reaches 75%-90% by denitration twice, total denitration rate, and entering NOx content in the flue gas of air reduces
To 50-100mg/Nm3, NOx content in the flue gas for enter air is considerably reduced, and due to reducing sintering temperature, reduce
Aluminum oxide heat consumption, so as to reducing cost.
Above example is only unrestricted to illustrate technical scheme, although with reference to preferred embodiment to this
It is bright to be described in detail, it will be appreciated by those skilled in the art that can modify to technical scheme or wait
With replacing, without deviating from the objective and scope of the technical program, it all should cover in scope of the presently claimed invention.
Claims (10)
1. a kind of Suspension Roaster for Aluminium Oxide equipment for denitrifying flue gas, it is characterised in that include：The main stove of roasting, the main stove of the roasting
Side be connected to cooling cyclone separator, opposite side is connected to roasting pair stove, and the heat that the cooling cyclone separator is discharged is empty
Gas respectively enters tie point pipe and the second bypass duct, and the tie point pipe is connected to the bottom of the main stove of the roasting,
The second branch road pipe end is connected with tuyere, and the tuyere is arranged at the middle part of the main stove of the roasting, second bypass duct
It is provided with shutter motor-driven valve, the main stove of the roasting is additionally provided with atomizer above the tuyere, and the atomizer connects
Compressed air hose and liquid-feeding tube are connected to, for adding the main reaction in furnace of the roasting, the roasting pair stove rear end to connect for drug solns
It is connected to pre- hot cyclone separator, the discharge pipe of the pre- hot cyclone separator is connected to reactor, the reactor is built with urging
Agent, for supplying the denitration in the reactor of the high-temperature flue gas containing ammonia, the bottom of the reactor is connected to drier.
2. Suspension Roaster for Aluminium Oxide equipment for denitrifying flue gas according to claim 1, it is characterised in that：The tuyere or/
It is provided with multiple with the atomizer, circular is arranged at around the main stove of the roasting, and is communicated in the main furnace interior of the roasting.
3. Suspension Roaster for Aluminium Oxide equipment for denitrifying flue gas according to claim 1, it is characterised in that：The liquid-feeding tube connects
Measuring pump is connected to, the measuring pump is connected to solution reservoir, and the solution reservoir is connected to filtering tank, and the filtering tank is connected to
Solution pump, the solution pump is connected to molten drug slot, and the molten drug slot is used for Pharmaceutical solutions and supplies the liquid-feeding tube.
4. Suspension Roaster for Aluminium Oxide equipment for denitrifying flue gas according to claim 3, it is characterised in that：The measuring pump with
The first valve group is provided between the liquid-feeding tube, the second valve group, the filtration are provided between the solution reservoir and the measuring pump
The 3rd valve group is provided between tank and the solution pump, between the solution pump and the molten drug slot the 4th valve group is provided with.
5. Suspension Roaster for Aluminium Oxide equipment for denitrifying flue gas according to claim 1, it is characterised in that：In the molten drug slot
The molten thing of institute is urea.
6. Suspension Roaster for Aluminium Oxide equipment for denitrifying flue gas according to claim 1, it is characterised in that：The roasting pair stove
Lower section be connected with dashpot, for for the roasting pair stove in aluminum oxide enter to extend the reaction time, the dashpot
It is connected to fluidisation airduct.
7. Suspension Roaster for Aluminium Oxide equipment for denitrifying flue gas according to claim 1, it is characterised in that：The reactor connects
Multiple acoustic wave soot blowers are connected to, the acoustic wave soot blower is connected to air reservoir.
8. Suspension Roaster for Aluminium Oxide equipment for denitrifying flue gas according to claim 1, it is characterised in that：The reactor
Differential manometer is provided between import and export, the reactor outlet is connected with monitoring nitrogen oxide instrument and ammonia monitor.
9. a kind of using method of the Suspension Roaster for Aluminium Oxide equipment for denitrifying flue gas based on described in claim 1, its feature exists
In, including：
The main stove of normally-open roasting and roasting pair stove, when temperature is reached in the main stove of certain backward roasting aluminium hydroxide is added,
When stable yield, the shutter motor-driven valve is adjusted, the hot-air shunting part discharged by the cooling cyclone separator is entered
Enter the main stove middle part of the roasting, air capacity of the control into the main furnace bottom of the roasting；
Drug solns are passed through into the liquid-feeding tube, drug solns are entered in the main stove of the roasting after the atomizer is atomization,
Meet high-temperature flue gas and chemical reaction denitration occurs；
Enter in the pre- hot cyclone separator after the main stove of reacted flue gas roasting described in, roasting pair stove and separate, point
Enter in the reactor from discharge pipe described in the rear high-temperature flue gas Jing containing ammonia, react in the presence of catalyst de-
Nitre, the flue gas after denitration enters the drier.
10. using method according to claim 9, it is characterised in that：The drug solns are urea liquid, and urea liquid is met
High-temperature flue gas are decomposed ammonification, and the nitrogen oxides in high-temperature flue gas generates nitrogen and vapor, the height containing ammonia with ammonia reaction
Warm flue gas reacts generation nitrogen and vapor in the presence of catalyst.
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| CN201611208024.1A CN106621752B (en) | 2016-12-23 | 2016-12-23 | Flue gas denitration device of alumina suspension roasting furnace and use method of flue gas denitration device |
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| CN201611208024.1A CN106621752B (en) | 2016-12-23 | 2016-12-23 | Flue gas denitration device of alumina suspension roasting furnace and use method of flue gas denitration device |
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| CN109847551A (en) * | 2019-02-19 | 2019-06-07 | 浙江菲达环保科技股份有限公司 | A kind of aluminum oxide roasting furnace flue gas becomes Zero discharging system |
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| CN106621752B (en) | 2024-03-08 |
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