CN110354772A - A kind of flue gas directly draws denitration urea pyrolysis device and method - Google Patents
A kind of flue gas directly draws denitration urea pyrolysis device and method Download PDFInfo
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- CN110354772A CN110354772A CN201910722647.8A CN201910722647A CN110354772A CN 110354772 A CN110354772 A CN 110354772A CN 201910722647 A CN201910722647 A CN 201910722647A CN 110354772 A CN110354772 A CN 110354772A
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- 238000000197 pyrolysis Methods 0.000 title claims abstract description 116
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 77
- 239000004202 carbamide Substances 0.000 title claims abstract description 77
- 239000003546 flue gas Substances 0.000 title claims abstract description 63
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000007789 gas Substances 0.000 claims abstract description 26
- 239000000779 smoke Substances 0.000 claims abstract description 25
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 20
- 229910021529 ammonia Inorganic materials 0.000 claims description 10
- 239000000428 dust Substances 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 5
- 238000004814 ceramic processing Methods 0.000 claims description 4
- 239000003638 chemical reducing agent Substances 0.000 claims description 4
- 238000000926 separation method Methods 0.000 claims 1
- 238000010248 power generation Methods 0.000 abstract description 2
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 10
- 239000007921 spray Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003500 flue dust Substances 0.000 description 1
- DOTMOQHOJINYBL-UHFFFAOYSA-N molecular nitrogen;molecular oxygen Chemical compound N#N.O=O DOTMOQHOJINYBL-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
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- 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
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—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
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8634—Ammonia
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/0006—Controlling or regulating processes
- B01J19/0013—Controlling the temperature of the process
-
- 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
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J2219/00049—Controlling or regulating processes
- B01J2219/00051—Controlling the temperature
- B01J2219/00121—Controlling the temperature by direct heating or cooling
- B01J2219/00123—Controlling the temperature by direct heating or cooling adding a temperature modifying medium to the reactants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J2219/00049—Controlling or regulating processes
- B01J2219/00051—Controlling the temperature
- B01J2219/00132—Controlling the temperature using electric heating or cooling elements
- B01J2219/00135—Electric resistance heaters
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
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- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
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Abstract
The invention discloses a kind of flue gases directly to draw denitration urea pyrolysis device and method, belongs to thermal power generation technical field of environment protection equipment.Include: boiler, smoke taking mouth is offered on the furnace wall of boiler, smoke taking mouth is connected to one end of gas inlet pipeline；Cyclone separator, cyclone separator are arranged on gas inlet pipeline；Deduster, deduster are arranged on gas inlet pipeline, and the side that cyclone separator deviates from smoke taking mouth is arranged in deduster；Cold air duct, cold air duct is connected to by cold wind electric butterfly valve with gas inlet pipeline, and cold air duct is between smoke taking mouth and cyclone separator；The entrance of urea pyrolysis furnace, urea pyrolysis furnace is connected to the other end of gas inlet pipeline, and the outlet of urea pyrolysis furnace has several pyrolysis oven outlet conduits, and each pyrolysis oven outlet conduit is provided with blower.A kind of flue gas provided by the invention directly draws denitration urea pyrolysis device and method, energy-saving, can guarantee system stable operation.
Description
Technical field
The present invention relates to thermal power generation technical field of environment protection equipment, it is specifically related to a kind of flue gas and directly draws denitration urea pyrolysis
Device and method.
Background technique
Contain a large amount of nitrogen oxides (NOx) in the flue gas that thermal power plant coal unit generates at present, for by nitrogen oxidation
Object (NOx) concentration is reduced to national security discharge standard, and domestic thermal power plant mainstream technology prepares ammonia conduct using urea pyrolysis
Reducing agent, selective catalytic reduction (SCR) flue-gas denitration process.Heat source uses air preheater outlet heat primary air (~300
DEG C) enter urea pyrolysis furnace after electric heater is heated to (~580 DEG C), the urea liquid sprayed by spray gun is pyrolyzed, heat
The ammonia (as reducing agent) that solution generates is transported to SCR reactor and is reacted.In former hot-air system, electric heater conduct
The core equipment of this system, power is big, power consumption is high, high failure rate, and heating tube leakage easy to wear, overtemperature tripping etc. lead to denitration system
It unites out of service, discharge is exceeded, and equipment dependability is low.
Summary of the invention
For the above-mentioned problems in the prior art, it is desirable to provide a kind of flue gas directly draws denitration urea pyrolysis device and side
High temperature flue-gas from boiler is introduced directly into urea pyrolysis furnace as the technology of heat source by method, replaces electric heater to prepare heat source with this,
It can guarantee system stable operation while reaching energy-saving again, manufacture and easy for installation practical.
Specific technical solution is as follows:
A kind of flue gas directly draws in denitration urea pyrolysis device, including
Boiler offers smoke taking mouth on the furnace wall of boiler, and smoke taking mouth is connected to one end of gas inlet pipeline；
Cyclone separator, cyclone separator are arranged on gas inlet pipeline；
Deduster, deduster are arranged on gas inlet pipeline, and deduster setting deviates from smoke taking mouth in cyclone separator
Side；
Cold air duct, cold air duct are connected to by cold wind electric butterfly valve with gas inlet pipeline, and cold air duct is positioned at taking
Between mouth and cyclone separator；
The entrance of urea pyrolysis furnace, urea pyrolysis furnace is connected to the other end of gas inlet pipeline, and urea pyrolysis furnace goes out
Mouth is communicated with several pyrolysis oven outlet conduits, and each pyrolysis oven outlet conduit is provided with blower；
Former hot-air system, the electric heater in former hot-air system are connected by the entrance of heat primary air pipeline and urea pyrolysis furnace
It is logical.
A kind of above-mentioned flue gas directly draws in denitration urea pyrolysis device, also has the feature that, further includes cryogenic overheating
The horizontal flue region in boiler is arranged in device, low temperature superheater, and the furnace wall of low temperature superheater rear end is arranged in smoke taking mouth.
A kind of above-mentioned flue gas directly draws in denitration urea pyrolysis device, also has the feature that, the height of smoke taking mouth output
Warm flue-gas temperature is not less than 580 DEG C.
A kind of above-mentioned flue gas directly draws in denitration urea pyrolysis device, also has the feature that, further includes electric gate valve
One and electric gate valve two, cyclone separator the side of smoke taking mouth is provided with electric gate valve one, furthermore deduster deviate from whirlwind
The side of separator is provided with electric gate valve two.
A kind of above-mentioned flue gas directly draws in denitration urea pyrolysis device, also has the feature that, further includes electric gate valve
Three, electric gate valve three is additionally provided on heat primary air pipeline.
A kind of above-mentioned flue gas directly draws in denitration urea pyrolysis device, also has the feature that, pyrolysis oven outlet conduit
Two are provided with, one is normally opened pyrolysis oven outlet conduit, and another is spare pyrolysis oven outlet conduit.
A kind of above-mentioned flue gas directly draws in denitration urea pyrolysis device, also has the feature that, normally opened pyrolysis outlet of still
It is provided with blower one on pipeline, is provided with electric gate valve four and electric gate valve on the normally opened pyrolysis oven outlet conduit of one two sides of blower
Five；It is provided with blower two on spare pyrolysis oven outlet conduit, is provided with electricity on the spare pyrolysis oven outlet conduit of two two sides of blower
Dynamic gate valve six and electric gate valve seven.
A kind of above-mentioned flue gas directly draws in denitration urea pyrolysis device, also has the feature that, blower one and blower two
Interior impeller surface carries out sprayed ceramic processing.
A kind of above-mentioned flue gas directly draws in denitration urea pyrolysis device, also has the feature that, normally opened pyrolysis outlet of still
Pipeline and spare pyrolysis oven outlet conduit are connected to away from one end of urea pyrolysis furnace with SCR reactor.
A kind of flue gas directly draws the method for denitration urea pyrolysis, comprising:
Step 1: by the high-temperature flue gas that is generated in boiler by first separating, after after the two-stage adsorbed removes dust technique
Into urea pyrolysis furnace；Or after using air preheater outlet heat primary air (300 DEG C) to be heated to 580 DEG C using electric heater
Into urea pyrolysis furnace；
Step 2: urea liquid is decomposed in urea pyrolysis furnace and generates ammonia；
Step 3: the ammonia (as reducing agent) for being pyrolyzed generation is transported to SCR reactor and is reacted.
The good effect of above-mentioned technical proposal is:
A kind of flue gas provided by the invention directly draws denitration urea pyrolysis device and method, and high temperature flue-gas from boiler is introduced directly into
Urea pyrolysis furnace is as main heating source, and using former hot-air system as standby heat source, two systems select a carry out heat supply, using boiler height
Warm flue gas be able to achieve when heat supply energy-saving, the stable operation of guarantee system entirety, and manufacture installation is simple；It additionally can be with
Carry out the replacement of new and old heat source system, former hot-air system is as spare, and furthermore pyrolysis oven outlet conduit is also equipped with twice, together
Another road is commonly used as spare, the reliability of guarantee system entirety.
Detailed description of the invention
Fig. 1 is the system principle for the embodiment one that a kind of flue gas of the invention directly draws denitration urea pyrolysis device and method
Figure.
In attached drawing: 1, boiler；2, low temperature superheater；3, cold wind electric butterfly valve；4, cold air duct；5, gas inlet pipeline；
61, electric gate valve one；62, electric gate valve two；63, electric gate valve three；64, electric gate valve four；65, electric gate valve five；66, electronic
Gate valve six；67, electric gate valve seven；7, cyclone separator；8, deduster；9, former hot-air system；91, electric heater；10, heat is primary
Air piping；11, urea pyrolysis furnace；12, normally opened pyrolysis oven outlet conduit；13, spare pyrolysis oven outlet conduit；141, blower one；
142, blower two.
Specific embodiment
It is real below in order to be easy to understand the technical means, the creative features, the aims and the efficiencies achieved by the present invention
It applies example combination attached drawing 1 denitration urea pyrolysis device is directly drawn to a kind of flue gas provided by the invention and be specifically addressed.
Fig. 1 is the structural schematic diagram for the embodiment one that a kind of flue gas of the invention directly draws denitration urea pyrolysis device, at this
In embodiment, the flue gas directly draw denitration urea pyrolysis device mainly include boiler 1, it is low temperature superheater 2, cold wind electric butterfly valve 3, cold
Air piping 4, gas inlet pipeline 5, electric gate valve 1, electric gate valve 2 62, electric gate valve 3 63, electric gate valve 4 64, electricity
Dynamic gate valve 5 65, electric gate valve 6 66, electric gate valve 7 67, cyclone separator 7, deduster 8, former hot-air system 9, electric heater
91, heat primary air pipeline 10, urea pyrolysis furnace 11, normally opened pyrolysis oven outlet conduit 12, spare pyrolysis oven outlet conduit 13, blower
One 141, blower 2 142.
A kind of flue gas directly draws in denitration urea pyrolysis device, and smoke taking mouth is offered on the furnace wall of boiler 1, smoke taking mouth position
Selection has particular requirement, it is desirable that the temperature of the high-temperature flue gas at the position is not less than 580 DEG C, smoke taking mouth and gas inlet pipeline 5
One end connection, high-temperature flue gas enters gas inlet pipeline 5.Cyclone separator 7 is arranged on gas inlet pipeline 5, whirlwind
Separator 7 is for separating the dust in high-temperature flue gas.Deduster 8 is arranged on gas inlet pipeline 5, and deduster 8
The side that cyclone separator 7 deviates from smoke taking mouth is set, and dust of the deduster 8 in high-temperature flue gas is adsorbed, Neng Gouti
Removal efficiency dusty, to be lowered into the dust concentration of subsequent workshop section.Cold air duct 4 passes through cold wind electric butterfly valve 3 and cigarette
Gas inlet pipe road 5 is connected to, and cold air duct 4 is between smoke taking mouth and cyclone separator 7, if the temperature of high-temperature flue gas is excessively high,
May by open cold wind electric butterfly valve 3, the cold wind in cold air duct 4 be passed through in gas inlet pipeline 5, to high-temperature flue gas into
Row cooling.The entrance of urea pyrolysis furnace 11 is connected to the other end of gas inlet pipeline 5, and high-temperature flue gas passes through gas inlet pipeline
5 enter one of the heat source in urea pyrolysis furnace 11 as pyrolysis, and the outlet of urea pyrolysis furnace 11 has several pyrolysis outlet of stills
Pipeline, each pyrolysis oven outlet conduit are provided with blower, and the ammonia generated in urea pyrolysis furnace 11 passes through a wherein pyrolysis oven
Outlet conduit is delivered to SCR reactor.Electric heater 91 in former hot-air system 9 passes through heat primary air pipeline and urea pyrolysis furnace
11 entrance connection, former hot-air system 9 is also as one of the pyrolysis heat source in urea pyrolysis furnace 11.
In a preferred embodiment, as shown in Figure 1, further including low temperature superheater 2, the setting of low temperature superheater 2 exists
Horizontal flue region in boiler 1, smoke taking mouth are preferably provided at the furnace wall of 2 rear end of low temperature superheater, 2 rear end of low temperature superheater
Flue-gas temperature fluctuating range stablize, and the region high-temperature flue-gas be higher than 580 DEG C.
In a preferred embodiment, as shown in Figure 1, the high-temperature flue-gas of smoke taking mouth output is not less than 580 DEG C,
Flue-gas temperature is excessively high can to carry out temperature adjusting by the cold wind in cold air duct 4.
In a preferred embodiment, as shown in Figure 1, further including electric gate valve 1 and electric gate valve 2 62, rotation
Wind separator 7 is provided with electric gate valve 1 close to the side of smoke taking mouth, and furthermore deduster 8 deviates from the side of cyclone separator 7
Be provided with electric gate valve 2 62, the on-off of electric gate valve 1 and electric gate valve 2 62 come control the high-temperature flue gas in boiler 1 into
Enter in urea pyrolysis furnace 11.
In a preferred embodiment, it as shown in Figure 1, further including electric gate valve 3 63, is gone back on heat primary air pipeline
It is provided with electric gate valve 3 63, the on-off of electric gate valve 3 63 enters urea pyrolysis furnace to control the hot wind in former hot-air system 9
In 11.
In a preferred embodiment, as shown in Figure 1, pyrolysis oven outlet conduit is provided with two, one is normally opened
Pyrolysis oven outlet conduit 12, another is spare pyrolysis oven outlet conduit 13, wherein when a pyrolysis oven outlet conduit is opened, separately
One pyrolysis oven outlet conduit is closed.
In a preferred embodiment, as shown in Figure 1, being provided with blower one on normally opened pyrolysis oven outlet conduit 12
141, electric gate valve 4 64 and electric gate valve 5 65 are provided on the normally opened pyrolysis oven outlet conduit 12 of one 141 two sides of blower；It is standby
With blower 2 142 is provided on pyrolysis oven outlet conduit 13, it is arranged on the spare pyrolysis oven outlet conduit 13 of 2 142 two sides of blower
There are electric gate valve 6 66 and electric gate valve 7 67, blower 141, blower 142 are placed on the lower urea pyrolysis furnace 11 of temperature and gone out
It is placed on the high gas inlet pipeline 5 of temperature on mouth pipeline without selecting, it in this way can be to avoid blower 141, blower 142 in high temperature
Long-play under the bad working environments of abrasion dusty.
In a preferred embodiment, as shown in Figure 1, the impeller surface in blower 1 and blower 2 142 carries out
Sprayed ceramic processing.Though high-temperature flue gas has fraction dust by the bipolar dedusting of cyclone separator 7 and deduster 8, special
Sprayed ceramic processing can improve the abrasionproof performance of impeller surface, prolong the service life.
In a preferred embodiment, as shown in Figure 1, normally opened pyrolysis oven outlet conduit 12 and spare pyrolysis outlet of still
Pipeline 13 is connected to away from one end of urea pyrolysis furnace 11 with SCR reactor, and it is anti-that the ammonia generated in urea pyrolysis furnace 11 passes to SCR
It answers in device, as the reduction to nitrogen oxides.
Hereinafter, being illustrated with a kind of specific embodiment, it should be pointed out that described in following implementation it
Structure, technique, selection are only to illustrate the feasibility of embodiment, the intention of there is no restriction the scope of the present invention.
The flue gas directly draws the working principle of denitration urea pyrolysis device, has two sets of independent heat source systems in the device,
High temperature flue-gas from boiler heat source is as common heat source, and former hot-air system is as standby heat source, and the high-temperature flue gas in boiler successively passes through
Cyclone separator and deduster are crossed, the flue dust in high-temperature flue gas is adsorbed, if the temperature of high-temperature flue gas is excessively high to lead to
It crosses cold air duct to be adjusted temperature, high-temperature flue gas enters urea pyrolysis furnace as heat source, there is spray gun spray in urea pyrolysis furnace
The urea liquid entered, high-temperature flue gas carry out thermal decomposition to urea liquid to generate ammonia, and the ammonia of generation passes through wherein one heat
Solution outlet of still pipeline enters SCR reactor, to contain a large amount of nitrogen oxygen in the flue gas generated to thermal power plant coal unit
Compound carries out reduction treatment.
The above is only preferred embodiments of the present invention, are not intended to limit the implementation manners and the protection scope of the present invention, right
For those skilled in the art, it should can appreciate that and all replace with being equal made by description of the invention and diagramatic content
It changes and obviously changes obtained scheme, should all be included within the scope of the present invention.
Claims (10)
1. a kind of flue gas directly draws denitration urea pyrolysis device characterized by comprising
Boiler offers smoke taking mouth on the furnace wall of the boiler, and the smoke taking mouth is connected to one end of gas inlet pipeline；
Cyclone separator, the cyclone separator are arranged on the gas inlet pipeline；
Deduster, the deduster are arranged on the gas inlet pipeline, and the deduster is arranged in the cyclonic separation
Device deviates from the side of the smoke taking mouth；
Cold air duct, the cold air duct is connected to by cold wind electric butterfly valve with the gas inlet pipeline, and the cool air hose
Road is between the smoke taking mouth and the cyclone separator；
Urea pyrolysis furnace, the entrance of the urea pyrolysis furnace are connected to the other end of the gas inlet pipeline, the urea heat
The outlet of solution furnace has several pyrolysis oven outlet conduits, and each pyrolysis oven outlet conduit is provided with blower；
Former hot-air system, electric heater the entering by heat primary air pipeline and the urea pyrolysis furnace in the original hot-air system
Mouth connection.
2. a kind of flue gas according to claim 1 directly draws denitration urea pyrolysis device, which is characterized in that further include low temperature mistake
The horizontal flue region in the boiler is arranged in hot device, the low temperature superheater, and the smoke taking mouth is arranged in the low temperature mistake
The furnace wall of hot device rear end.
3. a kind of flue gas according to claim 1 directly draws denitration urea pyrolysis device, which is characterized in that the smoke taking mouth is defeated
High-temperature flue-gas out is not less than 580 DEG C.
4. a kind of flue gas according to claim 1 directly draws denitration urea pyrolysis device, which is characterized in that further include electric brake
Valve one and electric gate valve two, the cyclone separator are provided with the electric gate valve one close to the side of the smoke taking mouth, furthermore
The deduster is provided with the electric gate valve two away from the side of the cyclone separator.
5. a kind of flue gas according to claim 1 directly draws denitration urea pyrolysis device, which is characterized in that further include electric brake
Valve three is additionally provided with the electric gate valve three on the heat primary air pipeline.
6. a kind of flue gas according to claim 1 directly draws denitration urea pyrolysis device, which is characterized in that the pyrolysis oven goes out
Mouth pipeline is provided with two, and one is normally opened pyrolysis oven outlet conduit, and another is spare pyrolysis oven outlet conduit.
7. a kind of flue gas according to claim 1 directly draws denitration urea pyrolysis device, which is characterized in that the normally opened pyrolysis
It is provided with blower one on outlet of still pipeline, is provided with electric brake on the normally opened pyrolysis oven outlet conduit of one two sides of blower
Valve four and electric gate valve five；Be provided with blower two on the spare pyrolysis oven outlet conduit, two two sides of blower it is described standby
With being provided with electric gate valve six and electric gate valve seven on pyrolysis oven outlet conduit.
8. a kind of flue gas according to claim 7 directly draws denitration urea pyrolysis device, which is characterized in that one He of blower
Impeller surface in the blower two carries out sprayed ceramic processing.
9. a kind of flue gas according to claim 7 directly draws denitration urea pyrolysis device, which is characterized in that the normally opened pyrolysis
Outlet of still pipeline and the spare pyrolysis oven outlet conduit are connected to away from one end of the urea pyrolysis furnace with SCR reactor.
10. a kind of flue gas directly draws the method for denitration urea pyrolysis, directly draw including flue gas described in claim 1-9 any one de-
Nitre urea pyrolysis device, which is characterized in that
Step 1: by the high-temperature flue gas that is generated in the boiler by first separating, after after the two-stage adsorbed removes dust technique
Into the urea pyrolysis furnace；Or 580 are heated to using electric heater using air preheater outlet heat primary air (300 DEG C)
Enter the urea pyrolysis furnace after DEG C；
Step 2: urea liquid is decomposed in the urea pyrolysis furnace and generates ammonia；
Step 3: the ammonia (as reducing agent) for being pyrolyzed generation is transported to the SCR reactor and is reacted.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111847489A (en) * | 2020-08-20 | 2020-10-30 | 沈阳工业大学 | Magnesium nitrate pyrolysis furnace device with high-temperature dust removal function and method |
| CN112007509A (en) * | 2020-08-27 | 2020-12-01 | 中航超能(北京)科技有限公司 | Treatment process for dedusting and denitration of tail gas of rotary kiln |
| CN113368805A (en) * | 2021-06-07 | 2021-09-10 | 北京未来明能科技有限公司 | System and method for preparing ammonia by decomposing urea |
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