CN207169430U - 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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- CN207169430U CN207169430U CN201721177714.5U CN201721177714U CN207169430U CN 207169430 U CN207169430 U CN 207169430U CN 201721177714 U CN201721177714 U CN 201721177714U CN 207169430 U CN207169430 U CN 207169430U
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- urea
- flue gas
- denitration
- heating furnace
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Abstract
The utility model 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.The utility model only needs to 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 utility model belongs to the emission reduction of industrial smoke nitrogen oxides (denitration) technical field, is related to one kind and is used for low-temperature flue gas
The urea pyrolysis and spraying system of SCR 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 utility model provides a kind of urea pyrolysis and spraying system for low-temperature smoke air SCR denitration, and the system can be with
Using in low-temperature smoke air SCR denitrating technique to improve the heating furnace heat that sets of flue-gas temperature to be pyrolyzed urea, and with heating
Flue gas caused by stove is uniformly sprayed into denitrating system original flue gas together, and reliable, stable ammonia sources are provided for SCR denitration, with
Solve the huge pyrolysis oven of prior art, heater and high-temperature blower and carry out high temperature, the hydrolysis of high pressure or high temperature, high heat demand
Pyrolytic process.
The technical solution of the utility model 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, the beneficial effects of the utility model are as follows:
A kind of urea pyrolysis and spraying system for low-temperature smoke air SCR denitration of the present utility model, without huge heat
Solve stove, heater and high-temperature blower, it is only necessary to urea liquid spray gun is arranged in furnace outlet flue, using caused by heating furnace
High-temperature flue gas is pyrolyzed urea and uniformly sprayed into together in denitration original flue gas with flue gas of heating furnace, it is not necessary to additionally sets bulky
Urea pyrolysis stove, urea pyrolysis need high-temperature gas and supporting dilution air, heater, ammonia spray distribution dress
Put, technique is simple, and system is reliable, easy to implement.
Certainly, implement any product of the present utility model to it is not absolutely required to reach all the above advantage simultaneously.
Brief description of the drawings
Fig. 1 is to be of the present utility model 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 utility model is expanded on further.It should be understood that these embodiments are merely to illustrate
The utility model, rather than limit the scope of protection of the utility model.Those skilled in the art are according to this in actual applications
The modifications and adaptations that utility model is made, still fall within the scope of protection of the utility model.
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 reality
With it is new be to carry out urea pyrolysis using this flue gas of heating furnace, and sprayed into flue gas of heating furnace in denitration original flue gas, both
Extra means are not needed 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 can be provided for SCR denitration system.
In order to better illustrate the utility model, the utility model 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 utility model, bag
Include and set air distribution blower fan 8 to be cooled to 500-600 DEG C to high-temperature flue gas progress air distribution caused by heating furnace 10, the flue gas after cooling is again
Uniformly 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 utility model carries out urea pyrolysis using flue gas of heating furnace, and sprays into denitration original flue gas with flue gas of heating furnace
In, both do not needed extra means to carry out the pyrolysis of urea, ammonia uniformly sprays into function in denitration original flue gas after realizing pyrolysis again,
So as to provide stable, reliable ammonia source for SCR denitration system, therefore, the utility model be applied to it is any be configured with it is external
The industrial smoke SCR denitration system of formula heating furnace.
The utility model preferred embodiment disclosed above is only intended to help and illustrates the utility model.Preferred embodiment is simultaneously
There is no the details that detailed descriptionthe is all, it is only described embodiment also not limit the utility model.Obviously, according to this theory
The content of bright book, it can make many modifications and variations.This specification is chosen and specifically describes these embodiments, is in order to preferably
Principle and practical application of the present utility model is explained, so that skilled artisan can be best understood by and utilize this
Utility model.The utility model 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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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107398176A (en) * | 2017-09-14 | 2017-11-28 | 上海宝钢节能环保技术有限公司 | Urea pyrolysis and spraying system for low-temperature smoke air SCR denitration |
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 |
CN113368681A (en) * | 2021-06-17 | 2021-09-10 | 华能太原东山燃机热电有限责任公司 | Flue gas nitrogen oxide control method for combined cycle unit waste heat boiler |
-
2017
- 2017-09-14 CN CN201721177714.5U patent/CN207169430U/en active Active
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107398176A (en) * | 2017-09-14 | 2017-11-28 | 上海宝钢节能环保技术有限公司 | Urea pyrolysis and spraying system for low-temperature smoke air SCR denitration |
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 |
CN113368681A (en) * | 2021-06-17 | 2021-09-10 | 华能太原东山燃机热电有限责任公司 | Flue gas nitrogen oxide control method for combined cycle unit waste heat boiler |
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