CN108731011A - Flue gas denitrification system - Google Patents
Flue gas denitrification system Download PDFInfo
- Publication number
- CN108731011A CN108731011A CN201710247151.0A CN201710247151A CN108731011A CN 108731011 A CN108731011 A CN 108731011A CN 201710247151 A CN201710247151 A CN 201710247151A CN 108731011 A CN108731011 A CN 108731011A
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- CN
- China
- Prior art keywords
- flue
- process system
- denitration process
- gas denitration
- exhausting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/006—Layout of treatment plant
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L15/00—Heating of air supplied for combustion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2215/00—Preventing emissions
- F23J2215/10—Nitrogen; Compounds thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2215/00—Preventing emissions
- F23J2215/20—Sulfur; Compounds thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2219/00—Treatment devices
- F23J2219/10—Catalytic reduction devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Treating Waste Gases (AREA)
- Chimneys And Flues (AREA)
Abstract
The present invention discloses a kind of flue gas denitrification system, including boiler furnace and pyrolysis mechanism, SCR reactors and pipe-line system outside boiler furnace；Described flue one end is connected to above-mentioned boiler furnace, and the other end is connected to the pyrolysis mechanism；Above-mentioned burner hearth flue one end is connected to above-mentioned boiler furnace, and the other end is connected to the SCR reactors；The wind pipe is connected between the pyrolysis mechanism and the SCR reactors；The flue-gas denitration process system further comprises having the exhausting booster body being connected between pyrolysis mechanism and SCR reactors, the exhausting booster body to be connected on wind pipe.SCR reactors are sent by being arranged exhausting booster body in the lower end of above-mentioned pyrolysis mechanism, and by high-temperature flue gas after supercharged, realizing denitrating flue gas, compared with the prior art, is conducive to the defect for improving exhausting booster body excessive temperature, influences the service life of system.
Description
【Technical field】
The present invention relates to the flue gases that a kind of flue gas denitrification system of coal-burning power plant more particularly to a kind of urea liquid are pyrolyzed
Denitrating system.
【Background technology】
Nitrogen oxides (NOx) in coal-fired plant flue gas is one of main atmosphere pollution, at present main application selection
Property catalytic reduction technique (SCR) administer flue gas in nitrogen oxides discharge, that is, utilize reducing agent selectively in flue gas
Reaction of nitrogen oxides, and generate nontoxic and pollution-free nitrogen (N2) and water (H2O), achieve the purpose that denitration environmental protection.Denitrating system
Common reducing agent has liquefied ammonia, ammonium hydroxide and urea liquid, select urea as reducing agent, with it is safe, derive from a wealth of sources, easily
In the transport and storage the features such as, it is widely used in field of environment protection, action principle is that urea liquid is passed through pyrolysis
Device is pyrolyzed into ammonia, is sent into SCR reactors, then chemical reduction reaction occurs, and realizes the purpose of denitration environmental protection.
Chinese invention patent the 201520986907.xth disclosed in 11 days Mays in 2016 is please referred to, discloses one
Kind flue-gas denitration process system comprising there is boiler, pyrolysis oven, SCR reactors, flue to be connected to boiler and pyrolysis oven
Together, and on flue it is provided with pressure charging system, so that the high-temperature flue gas in boiler to be transported in pyrolysis oven, due to pot
Kiln gas temperature is excessively high, very high to pressure charging system requirement, to increase the manufacturing cost and technical difficulty of the pressure charging system,
The operating cost of the flue-gas denitration process system is caused to increase simultaneously, and pressure charging system is always maintained under the condition of high temperature and operates, shadow
Ring the service life of pressure charging system.
Thus, it is desirable to which creative design one kind is simple for process, with good investment, operating cost is low, service life is long, maintenance
Few flue-gas denitration process system meets the market requirement.
【Invention content】
It is taken off in order to solve the above technical problems, the present invention provides flue gas that is a kind of easily operated and can extending system service life
Nitre system.
The present invention is achieved through the following technical solutions：A kind of flue gas denitrification system comprising：Boiler furnace and be located at pot
Pyrolysis mechanism, SCR reactors outside stove burner hearth and pipe-line system；The pipe-line system includes flue, burner hearth flue and goes out
Wind pipeline, the flue one end are connected to above-mentioned boiler furnace, and the other end is connected to the pyrolysis mechanism；Above-mentioned burner hearth flue one end
It is connected to above-mentioned boiler furnace, the other end is connected to the SCR reactors：The wind pipe be connected to the pyrolysis mechanism with it is described
Between SCR reactors：The flue-gas denitration process system further comprises being connected between pyrolysis mechanism and SCR reactors
Exhausting booster body, the exhausting booster body are connected on wind pipe.
The scheme of being further improved has：The flue-gas denitration process system further comprises the dedusting for being connected to the flue
Device, the deduster are equipped with dust-exhausting port.
The scheme of being further improved has：The flue-gas denitration process system further comprises dust discharge pipeline and smoke discharge tube
Road, dust discharge pipeline one end connect the dust-exhausting port of the deduster, and the other end is connected to smoke discharge tube road.
The scheme of being further improved has：The flue-gas denitration process system further comprises dust discharge pipeline, the dust discharge pipeline
One end connects the dust-exhausting port of the deduster, and the other end is connected on burner hearth flue.
The scheme of being further improved has：The exhausting booster body is supercharging exhaust fan.
The scheme of being further improved has：The exhausting booster body is jet pump.
The scheme of being further improved has：The flue-gas denitration process system further comprises there is air preheater, flue gas discharge
Pipeline is connected to air preheater and SCR reactors.
The scheme of being further improved has：The flue-gas denitration process system further comprises having connection boiler furnace and air pre-
A hot air duct between hot device, and the air preheater is equipped with discharge line.
The scheme of being further improved has：The flue-gas denitration process system further comprises there is air valve, which is connected to cigarette
Feed channel, and positioned between deduster and pyrolysis mechanism.
The scheme of being further improved has：The flue-gas denitration process system further comprises there is the dedusting for being connected to discharge line
Mechanism, desulfurizing tower and chimney.
The scheme of being further improved has：The flue-gas denitration process system is equipped with the cold wind system for being connected to the flue
System, the quenching system are equipped with regulating valve, to adjust the amount into flue cold wind to being passed through pyrolysis high-temperature flue gas within the organization
Carry out temperature adjustment.
Beneficial effects of the present invention are as follows：By being arranged exhausting booster body in the lower end of above-mentioned pyrolysis mechanism, and will
High temperature pyrolysis gas after supercharged is sent into SCR reactors, realizes denitrating flue gas, and compared with the prior art, being conducive to, which improves exhausting, increases
Press mechanism influences the service life of system due to the defect of excessive temperature.
【Description of the drawings】
Fig. 1 is the schematic diagram of the first embodiment of flue-gas denitration process system of the present invention；
Fig. 2 is the schematic diagram of second of embodiment of flue-gas denitration process system of the present invention.
【Specific implementation mode】
As shown in Figure 1, a kind of the first embodiment for the flue-gas denitration process system being related to for invention comprising pot
It is stove burner hearth 1, pyrolysis mechanism 2, SCR reactors 3, deduster 4, exhausting booster body 5, air preheater 6, total valve 71, multiple
Air valve 72, quenching system 8 and pipe-line system.The boiler furnace 1 is the equipment for generating high-temperature flue gas.
The pipe-line system includes flue 91, burner hearth flue 92, wind pipe 93, dust discharge pipeline 94, flue gas discharge
Pipeline 95 and a hot air duct 96；91 one end of the flue is connected to above-mentioned boiler furnace 1, and the other end is connected to the pyrolysis
Mechanism 2.In present embodiment, which is to be connected at the upper end of neighbouring boiler furnace 1, or be interpreted as fume pipe
Road 91 connect at boiler furnace be the high-temperature flue gas that can extract 450 DEG C or more region, the high temperature cigarette of the boiler furnace 1 as a result,
Gas is directly over flue 91 and is transported in the pyrolysis mechanism 2.Above-mentioned total valve 71 is connected to flue with air valve 72
On 91, and total valve 71 facilitates the maintenance of system, the air valve 72 to be located at deduster between boiler furnace 1 and deduster 4
Between 4 and pyrolysis mechanism 2, to control the flow and the maintenance for facilitating system that high-temperature flue gas enters in pyrolysis mechanism 2.
In the present embodiment, the quenching system 8 is located at 71 rear of total valve, and with regulating switch 81, and this is cold
Wind system is communicated in flue 91, and conveying cold air enters in flue 91, is adjusted by regulating switch 81 and enters cigarette
The amount of the cold wind of feed channel can be pyrolyzed conveying high-temperature flue gas progress temperature adjustment within the organization, and (it is 450 that can usually reconcile temperature control
DEG C to 600 DEG C), prevent the flue gas of excessive temperature to be transferred in pyrolysis mechanism 2.I.e. the quenching system 8 can be located at described total
Between valve 71 and the deduster 4 or between deduster 4 and pyrolysis mechanism 2.
In the boiler furnace 1, the other end is connected to the SCR reactors 3 for 92 one end of burner hearth flue connection；In this reality
Mode is applied, which is to be connected to the bottom of boiler furnace, or be interpreted as burner hearth pipeline 92 and connect boiler furnace cigarette
11 lower end of economizer in road send boiler combustion flue gas to progress denitration process in above-mentioned SCR reactors 3.
The wind pipe 93 is connected between the pyrolysis mechanism 2 and the SCR reactors 3, and the exhausting is pressurized
Mechanism 5 is connected between pyrolysis mechanism 2 and SCR reactors 3, i.e., the exhausting booster body 5 is connected on wind pipe 93, so that
The high-temperature flue gas pressure extracted from pyrolysis mechanism 2 is more than the pressure in SCR reactors 3, the high-temperature flue gas ingredient after pyrolysis
High temperature pyrolysis gas containing 5% or so ammonia.Compared with the prior art, exhausting booster body 5 is arranged in pyrolysis mechanism 2 present invention
Lower end, be conducive to improve exhausting booster body the excessively high defect of temperature, influence the service life of system, and in wind pipe 93
It is equipped with air valve 72, facilitates the maintenance of system.
In the present embodiment, the exhausting booster body 5 is jet pump, which, which is equipped with, is located in wind pipe 93
Nozzles with injector and connection wind pipe 93 on smoke inlet, the entrance of nozzles with injector is connected with injection air source, injection air source
Pressure higher than the high-temperature flue gas pressure in wind pipe, the gas of injection air source forms high-speed flow spray after flowing through nozzles with injector
Go out, injection pressurization is played to high-temperature flue gas, to make smoothly to flow to SCR reactions through the high-temperature flue gas after pyrolysis mechanism 2
Device 3.The jet pump 5 is simple and reliable for structure, the high temperature that can be reliably resistant to for a long time between 320 DEG C~400 DEG C.
Above-mentioned flue 91 is connected to the deduster 4, and described 94 one end of dust discharge pipeline connects the row of the deduster 4
Dirt mouth, the other end are connected to smoke discharge tube road 95, and the flue gas of boiler furnace 1 is first done dust removal process, prevents flue dust from blocking
Pipeline or system subsequent process equipment, while also reducing flue dust and entering pyrolysis mechanism 2, it prevents from blocking, and on dust discharge pipeline 94
Air valve 72 equipped with neighbouring 4 lower end of the deduster, facilitates the maintenance of system.
Air preheater 6 is connected to by above-mentioned smoke discharge tube road 95 with SCR reactors 3, and a hot air duct 96 will
The air preheater 6 is connected to the bottom of boiler furnace 1, has to boiler furnace supercharging, combustion-supporting and other effects, the air is pre-
6 downside of hot device is equipped with discharge line 97, which has been sequentially communicated dedusting mechanism 61, desulfurizing tower 62 and chimney 63, so as to
By the flue gas of SCR reactors by dedusting, desulfurization process, final qualified discharge prevents pollution environment.
The present invention is by being arranged exhausting booster body 5 in the lower end of above-mentioned pyrolysis mechanism 2, and by the high temperature cigarette after increase
Pneumatic transmission enters SCR reactors 3, realizes denitrating flue gas.Compared with the prior art, the present invention be conducive to improve exhausting booster body 5 due to
The defect of excessive temperature influences the service life of system；And deduster 4 is set between boiler furnace 1 and pyrolysis mechanism 2, it can
The denitrating system that purified high-temperature gas enters 2 rear end of pyrolysis mechanism is provided, prevents flue dust from blocking pyrolysis and spray ammonia system.
Certainly, above-mentioned exhausting booster body 5 or supercharging exhaust fan, need to only play the high-temperature flue gas in wind pipe
Pressurization, to make smoothly to flow to SCR reactors 3 through the high-temperature flue gas after pyrolysis mechanism 2, opposite jet pump, which can reduce, is
The manufacturing cost of system.
Shown in Fig. 2, be flue-gas denitration process system of the present invention second of embodiment, the embodiment and
The first embodiment is roughly the same, the difference is that, the other end connection of the dust discharge pipeline 94 of above-mentioned deduster 4 will be connected
Onto burner hearth flue 92, so as to by after dedusting dust and a small amount of flue gas send into SCR reactors and do denitration process, reduce dirty
Dye.
Claims (11)
1. a kind of flue-gas denitration process system comprising：Boiler furnace (1) and pyrolysis mechanism (2) outside boiler furnace,
SCR reactors (3) and pipe-line system；The pipe-line system includes flue (91), burner hearth flue (92) and wind pipe
(93), which is connected to above-mentioned boiler furnace (1), and the other end is connected to the pyrolysis mechanism (2)；Above-mentioned burner hearth
Flue (92) one end is connected to above-mentioned boiler furnace (1), and the other end is connected to the SCR reactors (3)；The wind pipe (93) is even
It is connected between the pyrolysis mechanism (2) and the SCR reactors (3)；It is characterized in that：The flue-gas denitration process system is into one
Step includes the exhausting booster body (5) being connected between pyrolysis mechanism (2) and SCR reactors (3), which connects
It passes on wind pipe (93).
2. flue-gas denitration process system as described in claim 1, it is characterised in that：The flue-gas denitration process system is further
Deduster (4) including being connected to the flue (91), the deduster are equipped with dust-exhausting port.
3. flue-gas denitration process system as claimed in claim 2, it is characterised in that：The flue-gas denitration process system is further
Including dust discharge pipeline (94) and smoke discharge tube road (95), dust discharge pipeline one end connects the dust-exhausting port of the deduster (4), separately
One end is connected to smoke discharge tube road.
4. flue-gas denitration process system as claimed in claim 2, it is characterised in that：The flue-gas denitration process system is further
Including dust discharge pipeline (94), dust discharge pipeline one end connects the dust-exhausting port of the deduster (4), and the other end is connected to burner hearth flue
(92) on.
5. flue-gas denitration process system according to any one of claims 1 to 4, it is characterised in that：The exhausting supercharger
Structure (5) is supercharging exhaust fan.
6. flue-gas denitration process system according to any one of claims 1 to 4, it is characterised in that：The exhausting supercharger
Structure (5) is jet pump.
7. flue-gas denitration process system as described in claim 1, it is characterised in that：The flue-gas denitration process system is further
Include air preheater (6), smoke discharge tube road (95) are connected to air preheater (6) and SCR reactors (3).
8. flue-gas denitration process system as claimed in claim 7, it is characterised in that：The flue-gas denitration process system is further
Include the hot air duct (96) connected between boiler furnace (1) and air preheater (6), and the air preheater is set
There is discharge line (97).
9. flue-gas denitration process system as claimed in claim 2, it is characterised in that：The flue-gas denitration process system is further
Include air valve (72), which is connected to flue (91), and positioned between deduster (4) and pyrolysis mechanism (2).
10. flue-gas denitration process system as claimed in claim 8, it is characterised in that：The flue-gas denitration process system is into one
Step includes to be connected to the dedusting mechanism, desulfurizing tower and chimney of discharge line.
11. flue-gas denitration process system as described in claim 1, it is characterised in that：The flue-gas denitration process system is equipped with
It is connected to the quenching system (8) of the flue (91), which is equipped with regulating valve (81), enters fume pipe to adjust
The amount of road (91) cold wind carries out temperature adjustment to being passed through pyrolysis high-temperature flue gas within the organization.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710247151.0A CN108731011A (en) | 2017-04-14 | 2017-04-14 | Flue gas denitrification system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710247151.0A CN108731011A (en) | 2017-04-14 | 2017-04-14 | Flue gas denitrification system |
Publications (1)
| Publication Number | Publication Date |
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| CN108731011A true CN108731011A (en) | 2018-11-02 |
Family
ID=63924881
Family Applications (1)
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| CN201710247151.0A Pending CN108731011A (en) | 2017-04-14 | 2017-04-14 | Flue gas denitrification system |
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| CN (1) | CN108731011A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108970390A (en) * | 2017-06-05 | 2018-12-11 | 昆山市三维换热器有限公司 | Flue gas denitrification system |
| CN113368674A (en) * | 2021-05-06 | 2021-09-10 | 华电电力科学研究院有限公司 | Denitration and dust removal combined system and method for coal-fired power plant |
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| CN102068904A (en) * | 2010-12-10 | 2011-05-25 | 中电投远达环保工程有限公司 | SCR flue gas denitration technology and device by urea directly-spraying method |
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| CN205216547U (en) * | 2015-12-02 | 2016-05-11 | 昆山市三维换热器有限公司 | Flue gas denitration process systems |
| CN205235766U (en) * | 2015-12-30 | 2016-05-18 | 安徽新力电业科技咨询有限责任公司 | Automatic control SCR flue gas denitration urea pyrolysis system |
| CN207073831U (en) * | 2017-04-14 | 2018-03-06 | 昆山市三维换热器有限公司 | Flue gas denitrification system |
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2017
- 2017-04-14 CN CN201710247151.0A patent/CN108731011A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080050297A1 (en) * | 2006-08-22 | 2008-02-28 | Babcock Power, Inc. | Thermal Decomposition of Urea in a Side Stream of Combustion Flue Gas Using a Regenerative Heat Exchanger |
| CN102068904A (en) * | 2010-12-10 | 2011-05-25 | 中电投远达环保工程有限公司 | SCR flue gas denitration technology and device by urea directly-spraying method |
| CN102179171A (en) * | 2011-03-28 | 2011-09-14 | 浙江大学 | Multi-stage themolysis coupled denitration method using front flow field uniformizing device and device thereof |
| CN205216547U (en) * | 2015-12-02 | 2016-05-11 | 昆山市三维换热器有限公司 | Flue gas denitration process systems |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108970390A (en) * | 2017-06-05 | 2018-12-11 | 昆山市三维换热器有限公司 | Flue gas denitrification system |
| CN113368674A (en) * | 2021-05-06 | 2021-09-10 | 华电电力科学研究院有限公司 | Denitration and dust removal combined system and method for coal-fired power plant |
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