CN107398176A - Urea pyrolysis and spraying system for low-temperature smoke air SCR denitration - Google Patents
Urea pyrolysis and spraying system for low-temperature smoke air SCR denitration Download PDFInfo
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- CN107398176A CN107398176A CN201710828974.2A CN201710828974A CN107398176A CN 107398176 A CN107398176 A CN 107398176A CN 201710828974 A CN201710828974 A CN 201710828974A CN 107398176 A CN107398176 A CN 107398176A
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- urea
- flue gas
- denitration
- heating furnace
- temperature
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- 239000004202 carbamide Substances 0.000 title claims abstract description 144
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 139
- 238000000197 pyrolysis Methods 0.000 title claims abstract description 35
- 239000000779 smoke Substances 0.000 title claims abstract description 35
- 238000005507 spraying Methods 0.000 title claims abstract description 19
- 239000003546 flue gas Substances 0.000 claims abstract description 105
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 100
- 238000010438 heat treatment Methods 0.000 claims abstract description 55
- 239000007788 liquid Substances 0.000 claims abstract description 44
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000007921 spray Substances 0.000 claims abstract description 33
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 19
- 238000000889 atomisation Methods 0.000 claims abstract description 7
- 238000003303 reheating Methods 0.000 claims abstract description 7
- 238000006243 chemical reaction Methods 0.000 claims abstract description 6
- 238000002485 combustion reaction Methods 0.000 claims description 12
- 239000000446 fuel Substances 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 5
- 230000007246 mechanism Effects 0.000 claims description 5
- 230000033228 biological regulation Effects 0.000 claims description 4
- 230000003197 catalytic effect Effects 0.000 claims description 3
- 238000002425 crystallisation Methods 0.000 claims description 3
- 230000008025 crystallization Effects 0.000 claims description 3
- 238000009688 liquid atomisation Methods 0.000 claims description 3
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 claims description 2
- 230000000149 penetrating effect Effects 0.000 claims 1
- 239000007789 gas Substances 0.000 abstract description 16
- 238000000034 method Methods 0.000 abstract description 5
- 230000001360 synchronised effect Effects 0.000 abstract description 3
- 238000010790 dilution Methods 0.000 abstract description 2
- 239000012895 dilution Substances 0.000 abstract description 2
- 239000003570 air Substances 0.000 description 31
- 239000000243 solution Substances 0.000 description 15
- 238000005516 engineering process Methods 0.000 description 7
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 229910000975 Carbon steel Inorganic materials 0.000 description 5
- 239000010962 carbon steel Substances 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- 239000010935 stainless steel Substances 0.000 description 5
- 229910001220 stainless steel Inorganic materials 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 4
- 235000011114 ammonium hydroxide Nutrition 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 235000019504 cigarettes Nutrition 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 3
- 230000002829 reductive effect Effects 0.000 description 3
- 210000002700 urine Anatomy 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000012080 ambient air Substances 0.000 description 2
- 238000009529 body temperature measurement Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- -1 electric power Substances 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000007062 hydrolysis Effects 0.000 description 2
- 238000006460 hydrolysis reaction Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000032258 transport Effects 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000004176 ammonification Methods 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000011944 chemoselective reduction Methods 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- WTHDKMILWLGDKL-UHFFFAOYSA-N urea;hydrate Chemical compound O.NC(N)=O WTHDKMILWLGDKL-UHFFFAOYSA-N 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- 238000004056 waste incineration Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8631—Processes characterised by a specific device
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/90—Injecting reactants
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C1/00—Ammonia; Compounds thereof
- C01C1/02—Preparation, purification or separation of ammonia
- C01C1/08—Preparation of ammonia from nitrogenous organic substances
- C01C1/086—Preparation of ammonia from nitrogenous organic substances from urea
-
- 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
The invention discloses a kind of urea pyrolysis and spraying system for low-temperature smoke air SCR denitration, urea metering supply system is communicated with the exhaust pass of described heating furnace, urea liquid is sprayed onto in the exhaust pass of heating furnace through urea metering supply system atomization, heat resolve is into ammonia under 500 600 DEG C of flue gas, then ammonia is sent into denitration original flue gas together with heating flue gas, and mixed under the auxiliary of disturbing flow device with denitration original flue gas, the synchronous reaction temperature for reheating denitration original flue gas and being needed to SCR.Present invention only requires arrange urea liquid spray gun in furnace outlet flue, uniformly sprayed into together in denitration original flue gas using high-temperature flue gas pyrolysis urea caused by heating furnace and with flue gas of heating furnace, high-temperature gas and supporting dilution air, heater, ammonia spray distribution device that bulky urea pyrolysis stove, urea pyrolysis need etc. need not be additionally set, technique is simple, system is reliable, easy to implement.
Description
Technical field
The invention belongs to the emission reduction of industrial smoke nitrogen oxides (denitration) technical field, is related to one kind and is used for low-temperature smoke air SCR
The urea pyrolysis and spraying system of denitration.
Background technology
Flue gas SCR (SCR) denitration technology is current industrial smoke (including electric power, chemical industry, steel, water
Mud, glass furnace, waste incineration etc.) denitration is most effective, most widely used technology.SCR denitration technology is in catalyst action
Under, with the NOx in flue gas Chemoselective reduction occurs for amino reductive, is allowed to generate N2And H2O, and without any waste gas, useless
The clean technology of water discharge.
In SCR gas denitrifying technologies, amino reductive can use liquefied ammonia, ammoniacal liquor and urea, because liquefied ammonia belongs to dangerous
Explosive chemicals, it transports, stored and using there is strict limitation, therefore, with the increasingly raising of people's awareness of safety, gets over
Start to limit application of the liquefied ammonia in flue gas SCR denitration system come more places.Less than 25% ammoniacal liquor can be stored with normal pressure,
Transport and use and potential safety hazard is not present, but because ammonia concn is than relatively low, during ammonia, about 80% useless water
Gasified simultaneously, expend substantial amounts of heat energy, therefore, use cost is very high.Urea is most safe and environment-friendly in SCR denitration technology
Amino reductive, but need to carry out high temperature, the hydrolysis of high pressure or high temperature, the pyrolytic process of high heat demand, fortune during use
Row expense is also higher, to reduce urea pyrolysis operating cost.
The content of the invention
The present invention provides a kind of urea pyrolysis and spraying system for low-temperature smoke air SCR denitration, and the system can utilize
To improve the heating furnace heat that sets of flue-gas temperature to be pyrolyzed urea in low-temperature smoke air SCR denitrating technique, and produced with heating furnace
Raw flue gas is uniformly sprayed into denitrating system original flue gas together, and reliable, stable ammonia sources are provided for SCR denitration, to solve
The huge pyrolysis oven of prior art, heater and high-temperature blower carry out high temperature, the hydrolysis of high pressure or high temperature, the heat of high heat demand
Solution preocess.
Technical scheme is as follows：
A kind of urea pyrolysis and spraying system for low-temperature smoke air SCR denitration, including air distribution blower fan is set to heating furnace
Caused high-temperature flue gas carries out air distribution and is cooled to 500-600 DEG C, and the flue gas after cooling uniformly sprays into denitration original flue gas mix again,
Realize the reheating of denitration original flue gas.
Urea metering supply system, the described urea of urea liquid warp are communicated with the exhaust pass of described heating furnace
Metering supply system atomization is sprayed onto in the exhaust pass of described heating furnace, the heat resolve ammonification under 500-600 DEG C of flue gas
Gas, then ammonia is sent into denitration original flue gas together with heating flue gas, and is mixed under the auxiliary of disturbing flow device with denitration original flue gas
It is even, the synchronous reaction temperature for reheating denitration original flue gas and being needed to SCR.
Preferably, smoke distributor is provided with denitration original flue gases duct, described smoke distributor is heating furnace
Mouth flue gas is uniformly sent into the device of denitration original flue gas.
Preferably, described disturbing flow device is arranged at the upstream or downstream 0.5-3.0m positions of described smoke distributor,
It is not less than the flow of flue gas distance of 1 second away from the fairing distance at downstream catalytic reactor inlet simultaneously.
Preferably, described disturbing flow device is that denitration original flue gas upsets its flow field so as to be filled with heating furnace feeding flue gas
Divide the device of mixing.
Preferably, described urea metering supply system includes the urea warehouse, urea dissolving tank, conveying dress being sequentially connected
Put, urea solution tank, urea feeding mechanism, metered dispensing unit and urea liquid spray gun, described urea liquid spray gun are set
On the exhaust pass of described heating furnace.
Preferably, described urea liquid spray gun for inject urea solution into flue gas with the mixed uniformly device of flue gas.
Preferably, described urea liquid spray gun is double medium urea liquid atomization jetting devices.
Preferably, described urea dissolving tank and described urea solution tank are respectively provided with tracing system, using electric tracing or
Steam tracing, prevent the crystallization of urea liquid from separating out..
Preferably, intermediate bin, described centre are additionally provided between described urea warehouse and described urea dissolving tank
Storehouse is urea distribution and computation container, ensures timing, be quantitative by urea feeding urea dissolving tank.
Preferably, described heating furnace for denitration original flue gas is reheated set independently of denitration original flue gas cigarette
The industrial furnace in road, combustion-supporting described heating furnace are provided with combustion fan and described air distribution blower fan, and described combustion fan is offer
Furnace fuel, which burns, needs the device of air, and described air distribution blower fan is the device of regulation furnace outlet flue-gas temperature.
Compared with prior art, beneficial effects of the present invention are as follows：
The present invention a kind of urea pyrolysis and spraying system for low-temperature smoke air SCR denitration, without huge pyrolysis oven,
Heater and high-temperature blower, it is only necessary to arrange urea liquid spray gun in furnace outlet flue, utilize high temperature caused by heating furnace
Smoke gas pyrolysis urea is simultaneously uniformly sprayed into denitration original flue gas together with flue gas of heating furnace, it is not necessary to additionally sets bulky urine
High-temperature gas and supporting dilution air, heater, ammonia spray distribution device that plain pyrolysis oven, urea pyrolysis need etc.,
Technique is simple, and system is reliable, easy to implement.
Certainly, any product for implementing the present invention it is not absolutely required to reach all the above advantage simultaneously.
Brief description of the drawings
Fig. 1 is the present invention for the urea pyrolysis of low-temperature smoke air SCR denitration and the structural representation of spraying system.
Reference：1- urea warehouses；2- intermediate bins；3- urea dissolving tanks；4- conveying devices；5- urea solution tanks；6-
Urea feeding mechanism；7- metered dispensing units；8- air distribution blower fans；9- combustion fans；10- heating furnaces；11- urea liquid spray guns；
12- smoke distributors；13- disturbing flow devices.
Embodiment
With reference to specific embodiment, the present invention is expanded on further.It should be understood that these embodiments are merely to illustrate this hair
It is bright, rather than limit protection scope of the present invention.Those skilled in the art change according to what the present invention made in actual applications
Enter and adjust, still fall within protection scope of the present invention.
SCR denitration has very high denitration performance, but correspondingly needs higher reaction temperature, in low-temperature flue gas
It is existing to usually require to set heating furnace to denitration original flue gas to ensure the denitration efficiency of SCR denitration system in SCR denitration system
Reheated, heating furnace is guarantee heating furnace typically using combustion mediums such as blast furnace gas/coke-stove gas/natural gases
Produce the uniform of flue gas and denitration original flue gas to mix and effective connection of flue, generally setting air distribution blower fan is to caused by heating furnace
High-temperature flue gas carries out air distribution and is cooled to 500-600 DEG C, and the flue gas after cooling uniformly sprays into denitration original flue gas mix again, realizes de-
The reheating of nitre original flue gas, and 500-600 DEG C of temperature is exactly effective pyrolysis temperature range of urea liquid, therefore, this hair
Bright is to carry out urea pyrolysis using this flue gas of heating furnace, and is sprayed into flue gas of heating furnace in denitration original flue gas, is both not required to
Extra means are wanted to carry out the pyrolysis of urea, ammonia uniformly sprays into function in denitration original flue gas after realizing pyrolysis again, so as to
Stable, reliable ammonia source is provided for SCR denitration system.
In order to better illustrate the present invention, the present invention is described in detail below with accompanying drawing.
As shown in figure 1, a kind of urea pyrolysis and spraying system for low-temperature smoke air SCR denitration of the present invention, including set
Put air distribution blower fan 8 and 500-600 DEG C is cooled to high-temperature flue gas progress air distribution caused by heating furnace 10, the flue gas after cooling is uniform again
Spray into denitration original flue gas and mix, realize the reheating of denitration original flue gas,
Urea metering supply system, the described urine of urea liquid warp are communicated with the exhaust pass of described heating furnace 10
Element metering supply system atomization is sprayed onto in the exhaust pass of described heating furnace 10, the heat resolve under 500-600 DEG C of flue gas
Into ammonia, then ammonia is sent into denitration original flue gas together with heating flue gas, and former with denitration under the auxiliary of disturbing flow device 13
Flue gas mixes, the synchronous reaction temperature for reheating denitration original flue gas and being needed to SCR.
Specifically, the described urea metering supply system of this implementation includes urea warehouse 1, the urea dissolving tank being sequentially connected
3rd, conveying device 4, urea solution tank 5, urea feeding mechanism 6, metered dispensing unit 7 and urea liquid spray gun 11, described urine
Plain solution spray gun 11 is arranged on the exhaust pass of described heating furnace 10.But described urea metering supply system is not limited to again
This.
Meanwhile intermediate bin 2, described centre are additionally provided between described urea warehouse 1 and described urea dissolving tank 3
Storehouse 2 is urea distribution and computation container, ensures timing, be quantitative by urea feeding urea dissolving tank 3.
Described urea dissolving tank 3 and described urea solution tank 5 are respectively provided with tracing system, using electric tracing or steam companion
Heat, prevent the crystallization of urea liquid from separating out..
Described urea warehouse 1 is the storage device of solid urea, can be that shape, the urea such as circular, square can be
Particle, or powdery, keep certain mobility.
The intermediate bin 2 is urea distribution and computation container, is provided with the auxiliary equipments such as measuring equipment, discharge valve, urea leads to
, can timing, quantitatively feeding urea dissolving tank after crossing intermediate bin metering.
Described urea dissolving tank 3 is the place of solid urea water mixing dissolving, and volume determines according to urea requirement amount, generally
In 2-80m3, the urea solution mass concentration after dissolving is in 30-50%；Dissolving tank is that stainless steel or carbon steel add corrosion-resistant container,
It is usually cylindric, or other forms, the facilities such as liquid level gauge, breather valve, pressure gauge, leakage fluid dram can be configured, in addition,
Be provided with steam or electric heat tracing device, the heat absorption for ensureing urea course of dissolution and maintain urea dissolving tank temperature (40-80 DEG C it
Between), prevent urea liquid from recrystallizing.
Described conveying device 4 is that urea liquid is delivered to the facility of urea solution tank by dissolving tank, can be centrifugal pump,
The forms such as displacement pump, pipeline measuring pump can also configure pressure, temperature is surveyed, it is necessary to consider the corrosivity and temperature of urea liquid
Equipment is measured, connecting pipe is that stainless steel or carbon steel add anti-corrosion；Conveying device ability is depending on dissolving tank volume, generally in 5-
100m3/ h, lift is in the range of 5-50m.
Described urea solution tank 5 is urea liquid storage facilities, its volume is determined as needed, generally in 2-80m3；
NaOH solution tank NaOH adds anti-corrosion form using stainless steel or carbon steel, usually cylindric, or other forms, be configured with liquid level gauge,
The facilities such as breather valve, pressure gauge, leakage fluid dram, in addition, being provided with steam or electric heat tracing device, ensure urea liquid in storage process
Middle temperature (40-80 DEG C) will not be too low, prevents urea liquid from recrystallizing.
Described urea feeding mechanism 6 is that urea liquid is delivered into urea solution metering distributor and urea liquid spray gun
Conveying device, can be the form such as centrifugal pump, displacement pump, pipeline measuring pump, it is necessary to consider the corrosivity and temperature of urea liquid
Degree, while pressure, temperature measurement equipment and flow regulator are configured with, connecting pipe is that stainless steel or carbon steel add anti-corrosion；For
Device capability is answered depending on SCR reactions need, generally in 0.01-10m3/ h, lift is according to urea liquid spray gun position
And depending on pressure demand, generally in the range of 50-200m.
Described urea solution metering distributor 7 includes the composition such as flowmeter, densitometer, pressure gauge, regulating valve, can be with
Adapt to the urea liquid flow and pressure condition of different urea liquid qualities, different urea liquid spray gun demands, metering distribution dress
It is one or more sets SCR denitration device distribution and computation urea liquids to put, and metering device ability is generally in 0.005-10m3/h
In the range of.
Described urea liquid spray gun 11 is to inject urea solution into flue gas with the mixed uniformly device of flue gas, is specially
Double medium urea liquid atomization jetting devices, i.e. urea liquid and compressed air two media, wherein compressed air are as atomization
Motive force, there is provided stable compressed air pressure and flow, urea liquid is as atomized feed, and its flow as needed is certain
Scope (0.005-0.5m3/ h) in fluctuate, two media by abundant atomized spray after nozzle into furnace outlet flue gas, spray
Mouth can be the shape such as circle, flat, triangle, and it is being sufficiently mixed and being atomized for guarantee compressed air and urea liquid that it, which is acted on,
(droplets particles are less than 1000 μm, and flue cross section can be completely covered in droplet) and make the urea after atomization that there is certain penetrate
Power.
Further, described urea liquid spray gun 11 can also use nitrogen, argon gas, superheated steam etc. to have pressure (0.4-
Gas 1.0MPa) promotes power media as atomization；The urea liquid spray gun 11 can be one or more, be installed on heating
On outlet of still walling of flue, it can also be installed in furnace outlet flue, by the mist of flue shape, size and urea liquid spray gun
Change ability etc. is determined, and ammonia water spray gun is evenly arranged in walling of flue or internal installation, ensures the urea liquid and cigarette sprayed into
The uniform contact and mixing of gas；Be installed on walling of flue spray gun can the side of flue, opposition both sides or surrounding arrangement；
This implementation is provided with smoke distributor 12 also on denitration original flue gases duct, and described smoke distributor 12 is will heating
Outlet of still flue gas is uniformly sent into the device of denitration original flue gas, can be the forms such as grating type, shell and tube, venturi type, torch-type,
Stainless steel or carbon steel material can be used according to flue gas of heating furnace temperature；Flue gas spout can be nozzle, or pipeline is opened
The exhaust gas volumn that hole, nozzle and perforate size are distributed as needed determines.
Described disturbing flow device 13 is arranged at the upstream or downstream 0.5-3.0m positions of described smoke distributor, simultaneously
It is not less than the flow of flue gas distance of 1 second away from the fairing distance at downstream catalytic reactor inlet.
Further, described disturbing flow device 13 is that denitration original flue gas upsets its flow field so as to be sent into flue gas with heating furnace
Well-mixed device, can be board-like shell and tube, grating type, flow-disturbing, disc type and other forms, it is to upset flue gas that it, which is acted on,
Flow direction, denitration original flue gas is set uniformly, fully to contact and mix with the heating furnace high-temperature flue gas that smoke distributor sprays into.
Heating furnace 10 described in the present embodiment for denitration original flue gas is reheated set independently of denitration original cigarette
The industrial furnace of gas flue, described heating furnace 10 are provided with combustion fan 9 and described air distribution blower fan 8, and described combustion fan 9 is
There is provided furnace fuel burning needs the device of air, and described air distribution blower fan 8 is the dress of regulation furnace outlet flue-gas temperature
Put.
Described heating furnace 10 for denitration original flue gas is reheated set independently of denitration original flue gases duct
Industrial furnace, its fuel can be the fuel such as blast furnace gas, coke-stove gas, coal gas of converter, natural gas, can be vertical, horizontal etc.
Form, combustion chamber can be the form such as square, circular, are provided with air distribution mixing furnace chamber on the outside of combustion chamber, after air cooling, ensure
Furnace outlet flue-gas temperature is not higher than 600 DEG C；Heating furnace can use inside holding, external thermal insulation or mixing thermal retardation form, insulation
Material can be the materials such as refractory brick, fibrofelt, tapetum fibrosum, alumina silicate, ensure oven enclosure contact atmospheric surface temperature not
Higher than 80 DEG C；Heating furnace is configured with the equipment such as one or more burners, pressure measurement, thermometric, fire detecting flame, survey CO, general warranty heating
Stove stabilization, safety and efficient burning.
Described air distribution blower fan 9 is the device of regulation furnace outlet flue-gas temperature, can be centrifugal blower, axle stream wind
The forms such as machine, ventilation blower, conveying wind can be ambient air, or a small amount of denitration original flue gas, while it is configured with pressure, temperature
Measuring apparatus and flow regulator are spent, insulation is determined according to pumped (conveying) medium or is not incubated；Air distribution blower fan draft capacity is by heating
Flue-gas temperature determines after furnace temperature burns, generally in 1000-100000Nm3/ h, pressure head are former according to heating furnace burner hearth and denitration
Depending on flue gas pressures, generally in the range of 1000-10000Pa.
Described combustion fan 8 needs the device of air to provide furnace fuel burning, can be centrifugal blower, axle stream
The forms such as blower fan, ventilation blower, conveying wind can be ambient air, or other have certain oxygen content (oxygen content 10-
Gas 21vt%), while pressure, temperature measurement equipment and flow regulator are configured with, determine to be incubated according to pumped (conveying) medium
Or it is not incubated；Combustion fan draft capacity is that the fuel quantity of burning and combustion-supporting gas oxygen content determine by heating furnace load, generally
In 500-50000Nm3/ h, pressure head is depending on heating furnace burner hearth and denitration original flue gas pressures, generally in 1000-10000Pa models
Enclose interior
The present invention carries out urea pyrolysis using flue gas of heating furnace, and is sprayed into flue gas of heating furnace in denitration original flue gas,
Both extra means had not been needed to carry out the pyrolysis of urea, ammonia uniformly sprays into function in denitration original flue gas after realizing pyrolysis again, from
And stable, reliable ammonia source can be provided for SCR denitration system, therefore, the present invention is applied to any external that is configured with and heated
The industrial smoke SCR denitration system of stove.
Present invention disclosed above preferred embodiment is only intended to help and illustrates the present invention.Preferred embodiment is not detailed
All details are described, it is only described embodiment also not limit the invention.Obviously, according to the content of this specification,
It can make many modifications and variations.This specification is chosen and specifically describes these embodiments, is to preferably explain the present invention
Principle and practical application so that skilled artisan can be best understood by and utilize the present invention.The present invention is only
Limited by claims and its four corner and equivalent.
Claims (10)
1. a kind of urea pyrolysis and spraying system for low-temperature smoke air SCR denitration, including set air distribution blower fan to produce heating furnace
Raw high-temperature flue gas carries out air distribution and is cooled to 500-600 DEG C, and the flue gas after cooling uniformly sprays into denitration original flue gas mix again, real
The reheating of existing denitration original flue gas, it is characterised in that
Urea metering supply system, the described urea metering of urea liquid warp are communicated with the exhaust pass of described heating furnace
Supply system atomization is sprayed onto in the exhaust pass of described heating furnace, and heat resolve is into ammonia under 500-600 DEG C of flue gas, so
Ammonia is sent into denitration original flue gas together with heating flue gas afterwards, and is mixed under the auxiliary of disturbing flow device with denitration original flue gas, together
Step reheats the reaction temperature that denitration original flue gas needs to SCR.
2. the urea pyrolysis and spraying system according to claim 1 for low-temperature smoke air SCR denitration, it is characterised in that
Smoke distributor is provided with denitration original flue gases duct, described smoke distributor is uniformly to be sent into furnace outlet flue gas to take off
The device of nitre original flue gas.
3. the urea pyrolysis and spraying system according to claim 2 for low-temperature smoke air SCR denitration, it is characterised in that
Described disturbing flow device is arranged at the upstream or downstream 0.5-3.0m positions of described smoke distributor, while away from downstream catalytic
Fairing distance at reactor inlet is not less than the flow of flue gas distance of 1 second.
4. the urea pyrolysis and spraying system for low-temperature smoke air SCR denitration according to claim 1 or 3, its feature exist
In described disturbing flow device is that denitration original flue gas upsets its flow field so as to be sent into the well-mixed dress of flue gas with heating furnace
Put.
5. the urea pyrolysis and spraying system according to claim 1 for low-temperature smoke air SCR denitration, it is characterised in that
Urea warehouse that described urea metering supply system includes being sequentially connected, urea dissolving tank, conveying device, urea solution tank,
Urea feeding mechanism, metered dispensing unit and urea liquid spray gun, described urea liquid spray gun are arranged on described heating furnace
Exhaust pass on.
6. the urea pyrolysis and spraying system according to claim 5 for low-temperature smoke air SCR denitration, it is characterised in that
Described urea liquid spray gun is fully to be atomized urea liquid in penetrating flue gas and the mixed uniformly device of flue gas.
7. the urea pyrolysis and spraying system according to claim 6 for low-temperature smoke air SCR denitration, it is characterised in that
Described urea liquid spray gun is double medium urea liquid atomization jetting devices.
8. the urea pyrolysis and spraying system according to claim 5 for low-temperature smoke air SCR denitration, it is characterised in that
Described urea dissolving tank and described urea solution tank are respectively provided with tracing system, using electric tracing or steam tracing, prevent from urinating
The crystallization of plain solution separates out.
9. the urea pyrolysis and spraying system according to claim 5 for low-temperature smoke air SCR denitration, it is characterised in that
Intermediate bin is additionally provided between described urea warehouse and described urea dissolving tank, described intermediate bin is urea distribution and computation
Container, ensure timing, be quantitative by urea feeding urea dissolving tank.
10. the urea pyrolysis and spraying system according to claim 1 for low-temperature smoke air SCR denitration, it is characterised in that
Described heating furnace is combustion-supporting to be reheated the industrial furnace independently of denitration original flue gases duct set to denitration original flue gas
Described heating furnace is provided with combustion fan and described air distribution blower fan, and described combustion fan needs to provide furnace fuel burning
The device of air is wanted, described air distribution blower fan is the device of regulation furnace outlet flue-gas temperature.
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| CN201710828974.2A CN107398176A (en) | 2017-09-14 | 2017-09-14 | Urea pyrolysis and spraying system for low-temperature smoke air SCR denitration |
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| CN201710828974.2A CN107398176A (en) | 2017-09-14 | 2017-09-14 | Urea pyrolysis and spraying system for low-temperature smoke air SCR denitration |
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| CN107930358A (en) * | 2017-12-30 | 2018-04-20 | 湖南安普诺环保科技有限公司 | A kind of alkali recovery boiler flue gas denitrification system and its out of stock method |
| CN108225855A (en) * | 2018-01-17 | 2018-06-29 | 环境保护部华南环境科学研究所 | One kind can temperature control combustion chamber and flue gas dilution sampling system |
| CN108579375A (en) * | 2018-06-20 | 2018-09-28 | 山东国舜建设集团有限公司 | Sintering device flue gas is heated cooperates with denitrification apparatus and method of denitration with ammonia mixing and SNCR |
| CN109173723A (en) * | 2018-10-30 | 2019-01-11 | 中国海洋石油集团有限公司 | Simplification SCR denitration system for gas turbine and Waste Heat Generation unit |
| CN109289520A (en) * | 2018-10-16 | 2019-02-01 | 中国华电科工集团有限公司 | A kind of low energy consumption distribution out of stock system and the method that is pyrolyzed urea liquid |
| CN109316962A (en) * | 2018-11-20 | 2019-02-12 | 张扬 | Middle low temperature SCR denitration urea pyrolysis and catalyst regeneration integral process |
| CN109534359A (en) * | 2019-01-16 | 2019-03-29 | 北京工大环能科技有限公司 | A kind of ammonia preparation facilities for flue gas denitrification system |
| CN110482569A (en) * | 2019-08-01 | 2019-11-22 | 北京明娃节能环保科技有限公司 | A kind of urea pyrolysis ammonia equipment and its Ammonia Process for denitrating system |
| CN110566323A (en) * | 2019-09-06 | 2019-12-13 | 沪东重机有限公司 | Mounting structure of marine HPSCR auxiliary system |
| CN110963506A (en) * | 2019-12-26 | 2020-04-07 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Urea ammonia production system with injection steam as auxiliary heat source |
| CN112691545A (en) * | 2020-12-17 | 2021-04-23 | 浙江德创环保科技股份有限公司 | Denitration system applied to treatment of copper-clad plate gluing waste gas |
| WO2021143933A1 (en) * | 2020-01-19 | 2021-07-22 | 肇庆新川绿色科技有限公司 | Denitration method in alkali recovery furnace |
| CN113908691A (en) * | 2021-11-17 | 2022-01-11 | 航天环境工程有限公司 | Light skid-mounted urea pyrolysis pneumatic SCR tail gas treatment system, method and application |
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| CN107930358A (en) * | 2017-12-30 | 2018-04-20 | 湖南安普诺环保科技有限公司 | A kind of alkali recovery boiler flue gas denitrification system and its out of stock method |
| CN108225855A (en) * | 2018-01-17 | 2018-06-29 | 环境保护部华南环境科学研究所 | One kind can temperature control combustion chamber and flue gas dilution sampling system |
| CN108579375A (en) * | 2018-06-20 | 2018-09-28 | 山东国舜建设集团有限公司 | Sintering device flue gas is heated cooperates with denitrification apparatus and method of denitration with ammonia mixing and SNCR |
| CN109289520A (en) * | 2018-10-16 | 2019-02-01 | 中国华电科工集团有限公司 | A kind of low energy consumption distribution out of stock system and the method that is pyrolyzed urea liquid |
| CN109173723A (en) * | 2018-10-30 | 2019-01-11 | 中国海洋石油集团有限公司 | Simplification SCR denitration system for gas turbine and Waste Heat Generation unit |
| CN109316962A (en) * | 2018-11-20 | 2019-02-12 | 张扬 | Middle low temperature SCR denitration urea pyrolysis and catalyst regeneration integral process |
| US11525380B2 (en) | 2019-01-11 | 2022-12-13 | Cummins Emission Solutions Inc. | Aftertreatment system with multiple dosing modules |
| CN109534359A (en) * | 2019-01-16 | 2019-03-29 | 北京工大环能科技有限公司 | A kind of ammonia preparation facilities for flue gas denitrification system |
| CN109534359B (en) * | 2019-01-16 | 2023-11-03 | 北京工大环能科技有限公司 | Ammonia gas preparation device for flue gas denitration system |
| CN110482569A (en) * | 2019-08-01 | 2019-11-22 | 北京明娃节能环保科技有限公司 | A kind of urea pyrolysis ammonia equipment and its Ammonia Process for denitrating system |
| CN110566323A (en) * | 2019-09-06 | 2019-12-13 | 沪东重机有限公司 | Mounting structure of marine HPSCR auxiliary system |
| CN110963506A (en) * | 2019-12-26 | 2020-04-07 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Urea ammonia production system with injection steam as auxiliary heat source |
| WO2021143933A1 (en) * | 2020-01-19 | 2021-07-22 | 肇庆新川绿色科技有限公司 | Denitration method in alkali recovery furnace |
| CN112691545A (en) * | 2020-12-17 | 2021-04-23 | 浙江德创环保科技股份有限公司 | Denitration system applied to treatment of copper-clad plate gluing waste gas |
| CN112691545B (en) * | 2020-12-17 | 2023-03-10 | 浙江德创环保科技股份有限公司 | Denitration system applied to treatment of copper-clad plate gluing waste gas |
| CN113908691A (en) * | 2021-11-17 | 2022-01-11 | 航天环境工程有限公司 | Light skid-mounted urea pyrolysis pneumatic SCR tail gas treatment system, method and application |
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