CN106168376B - A kind of twin furnace coal dust gasification low nitrogen burning Industrial Boiler - Google Patents
A kind of twin furnace coal dust gasification low nitrogen burning Industrial Boiler Download PDFInfo
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- CN106168376B CN106168376B CN201610745593.3A CN201610745593A CN106168376B CN 106168376 B CN106168376 B CN 106168376B CN 201610745593 A CN201610745593 A CN 201610745593A CN 106168376 B CN106168376 B CN 106168376B
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- furnace
- furnace chamber
- coal dust
- main furnace
- economizer
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C5/00—Disposition of burners with respect to the combustion chamber or to one another; Mounting of burners in combustion apparatus
- F23C5/08—Disposition of burners
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C6/00—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion
- F23C6/04—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion in series connection
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C7/00—Combustion apparatus characterised by arrangements for air supply
- F23C7/002—Combustion apparatus characterised by arrangements for air supply the air being submitted to a rotary or spinning motion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C7/00—Combustion apparatus characterised by arrangements for air supply
- F23C7/02—Disposition of air supply not passing through burner
- F23C7/06—Disposition of air supply not passing through burner for heating the incoming air
- F23C7/08—Disposition of air supply not passing through burner for heating the incoming air indirectly by a secondary fluid other than the combustion products
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
- F23C9/003—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber for pulverulent fuel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
- F23C9/06—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber for completing combustion
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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
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
-
- 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
Abstract
The invention discloses a kind of twin furnace coal dust gasification low nitrogen burning Industrial Boilers, including main furnace chamber, burner, secondary-furnace, back-end ductwork, economizer, air preheater；Part parallel interval is provided with multiple groups secondary air duct on main furnace chamber, and burnout degree air outlet is partially provided under main furnace chamber and secondary-furnace, and back-end ductwork is disposed with convective region and SCR denitration area in furnace along smoke movement direction.The present invention uses double-furnace structure, coal dust firing is set to have sufficient gasification space and after-flame space, coal dust gasification combustion technology keeps main furnace chamber Temperature Distribution more uniform, localized high temperature regions are avoided to generate, simultaneously using by staged air distribution means, the discharge of NOx is reduced, while size of burner hearth also passes through reasonable selection, secondary-furnace mainly burns a part of uncombusted CO and coal dust again, improves the burn-off rate of coal dust.
Description
Technical field
The invention belongs to boiler plant technical fields, and in particular to a kind of twin furnace coal dust gasification low nitrogen burning industry pot
Furnace.
Background technique
China is the developing country used coal as its main energy source, and coal resources account for China's production of energy and total quantity consumed
75% or so.Coal in combustion, can generate a large amount of pollutant, wherein nitrogen oxides (NOX) very big to environmental hazard,
Nitrogen oxides is in addition to forming Acid rain damages ecological environment, moreover it is possible to form photochemical fog and endanger human health.Coal high-temp combustion
It is NOXOne of main source, and China's boiler is mainly based on fire coal, therefore reduces coal-burning boiler NOXDischarge have it is important
Meaning.
Meanwhile to administer the pollution of the severe airs such as haze, to boiler smoke discharge index, more stringent requirements are proposed for country；
Simultaneously the energy efficiency indexes of boiler are also required to be greatly improved, existing rule of management (TSG0002) regulation, III class bituminous coal,
20t/h is with upper layer burner energy efficiency indexes: 88 ﹪ of boiler thermal efficiency target value, 82 ﹪ of boiler thermal efficiency limit value；And NOx emission cigarette
Gas index, all parts of the country require it is different, from tens milligrams every cubic metre to 200mg/m3；There is thermal effects for existing conventional boiler
Rate is insufficient, and flue gas emission there is a problem of polluting, is not up to standard, and the boiler with better environmental-protecting performance will have more wide
Development prospect.
Summary of the invention
In order to overcome the shortcomings of that existing boiler plant NOx emission is not up to standard, the present invention provides a kind of twin furnace coal dust gas
Change low nitrogen burning Industrial Boiler, which uses double-furnace structure, and by staged air distribution means, makes a part of coal dust in height
Gasification generates a large amount of CO under warm oxygen debt environment, rather than directly generates CO2, CO is relatively generated due to generating CO in combustion process2Process
Thermal discharge it is small, so burner hearth is unlikely to generate the too high phenomenon of local temperature, NOx generation can be effectively reduced in this way.
On the other hand the CO generated can restore a part of NOx, and turn, this reduces the discharges of a part of NOx.Reasonable burner hearth simultaneously
Size also makes in-furnace temperature distribution more uniform, greatly reduces the NOx generated by localized hyperthermia.In addition the setting of secondary-furnace
CO uncombusted in main furnace chamber and part coal dust can be burnt again, improve the burn-off rate of coal dust.
The technical solution adopted by the present invention to solve the technical problems is:
A kind of twin furnace coal dust gasification low nitrogen burning Industrial Boiler, including vertically-mounted main furnace chamber, main furnace chamber is provided with
Burner, main furnace chamber rear portion close installation have secondary-furnace, and secondary-furnace rear portion close installation has back-end ductwork；The connection of main furnace chamber lower end
Secondary-furnace lower end, secondary-furnace upper end are connected to back-end ductwork upper end, and back-end ductwork lower end is connected to economizer, and economizer upper end is provided with
Air preheater；Part parallel interval is provided with multiple groups secondary air duct, the main furnace chamber and secondary-furnace on the main furnace chamber
Lower part is provided with burnout degree air outlet, the back-end ductwork along smoke movement direction be disposed in furnace convective region and
SCR denitration area；The main furnace chamber and secondary-furnace surrounding adhere to fin panel casing；The air outlet of the air preheater is distinguished
Burner, secondary air duct and burnout degree air outlet are connected by pipeline.Fire coal is lighted in the burner first, enters main furnace later
Thorax, supplying air to main furnace chamber by air duct makes a part of coal dust gas under the oxygen debt environment of high temperature by staged air distribution means
A large amount of CO are generated, the heat that this process is released is relatively small, the excessively high situation of local temperature will not be generated in main furnace chamber, effectively
The discharge for reducing NOx, and CO can restore a part of NOx reduce the discharge of a part of NOx again.CO and uncombusted
Coal dust entered in secondary-furnace by the lower end of main furnace chamber, burn again after being mixed with the burnout degree filled into, improve the combustion of coal dust
Rate to the greatest extent.Flue gas enters back-end ductwork from the upper end of secondary-furnace later, and convective region is right again in the furnace being arranged inside back-end ductwork
Water is heated, and flue gas carries out denitration by SCR denitration area later, avoids the smoke pollution atmosphere containing nitre, and flue gas passes through later
Economizer and air preheater are finally discharged.Main furnace chamber, secondary-furnace and back-end ductwork form three backhaul exhaust gases passes of S type, S type cigarette
Gas channel can effectively improve the flow distance of flue gas, increase coal dust burning time in furnace, improve efficiency of combustion.And energy
Rational choice velocity of flue gas, dust stratification is few, and converting heat is high-efficient.
Preferably, main furnace chamber is partially surrounded on the main furnace chamber be arranged at intervals with four groups of secondary air ducts being parallel to each other,
Every group of secondary air duct includes surrounding main furnace chamber and in two secondary air duct blast pipes of same plane setting, each secondary air duct
An air inlet and four spouts are provided on blast pipe, the air-flow that spout sprays is in the form of the circle of contact that 0 ~ 15 degree of angle is formed
It is blown into main furnace chamber；The intake of four groups of secondary air ducts accounts for 20 ~ 35% into boiler total blast volume.Utilize staged air distribution hand
Section reduces the discharge of NOx so that the coal dust in region gas under the oxygen debt environment of high temperature generates a large amount of CO.
Preferably, four spouts of each secondary air duct blast pipe are respectively arranged at the surrounding of corresponding burner, each
Four spouts of secondary air duct blast pipe are sent to inside main furnace chamber in the form of the circle of contact, mix well with air coal dust uniformly,
Improve the burn-off rate of coal dust.
Preferably, the economizer is provided with two-stage, including the level-one economizer being arranged along smoke movement direction and two
Grade economizer；Level-one economizer lower end is provided with return water import, and the water outlet of second level economizer upper end is connected in furnace by pipeline
Convective region and fin panel casing.Two-stage economizer is arranged the heat that flue gas contains is absorbed and utilized again, reduces flue gas
Temperature improves the conversion ratio of heat.
Preferably, the burnout degree is sent by circulating fan, and the air quantity of feeding accounts for 5 ~ 10% into boiler total blast volume,
So that CO and uncombusted coal dust burn again in secondary-furnace, the burn-off rate of coal dust is improved.
Preferably, the intake of the burner accounts for 60 ~ 80% into boiler total blast volume, and coal dust is made adequately to burn.
The invention has the advantages that making coal dust firing have sufficient gasification space and after-flame space, coal using double-furnace structure
Powder gasification, and combustion technology keeps main furnace chamber Temperature Distribution more uniform, avoids localized high temperature regions from generating, and pass through staged air distribution
Means make a part of coal dust gasify under the oxygen debt environment of high temperature and generate a large amount of CO, and it is too high that burner hearth is unlikely to generation local temperature
Phenomenon, can be effectively reduced NOx generation in this way, and a part of NOx can be restored this and reduced again by the CO on the other hand generated
The discharge of a part of NOx can effectively reduce NOx generation.Size of burner hearth also passes through reasonable selection simultaneously, and secondary-furnace is main
A part of uncombusted CO and coal dust are burnt again, improve the burn-off rate of coal dust.
Detailed description of the invention
Fig. 1 is main view of the invention；
Fig. 2 is the structural schematic diagram of main furnace chamber of the invention, secondary-furnace and back-end ductwork；
Fig. 3 is the cross-sectional view in the direction A-A in Fig. 2；
Fig. 4 is the structural schematic diagram of economizer and air preheater.
Symbol description in figure: 1, main furnace chamber；2, burner；3, secondary-furnace；4, back-end ductwork；5, air preheater；6, it fires
Wind air outlet to the greatest extent；7, convective region in furnace；8, SCR denitration area；9, fin panel casing；10, secondary air duct blast pipe；11, air inlet；
12, spout；13, level-one economizer；14, second level economizer；15, return water import.
Specific embodiment
The present invention will be further explained below with reference to the accompanying drawings:
As depicted in figs. 1 and 2, the present invention designs multiple hearth structure, and including vertically-mounted main furnace chamber 1, main furnace chamber 1 is arranged
There is burner 2,1 rear portion close installation of main furnace chamber has secondary-furnace 3, and 3 rear portion close installation of secondary-furnace has back-end ductwork 4.
The present invention is in order to make main furnace chamber 1, secondary-furnace 3 and back-end ductwork 4 form three backhaul exhaust gases passes of S type, under main furnace chamber 1
End connection 3 lower end of secondary-furnace, 3 upper end of secondary-furnace are connected to 4 upper end of back-end ductwork, and 4 lower end of back-end ductwork is connected to economizer, economizer
Upper end is provided with air preheater 5, and S type exhaust gases passes can effectively improve the flow distance of flue gas, increases coal dust in furnace
Burning time improves efficiency of combustion.
The present invention is in order to use staged air distribution technology, and it is secondary to be provided with multiple groups for part parallel interval on the main furnace chamber 1
Air duct is partially provided with burnout degree air outlet 6 under the main furnace chamber 1 and secondary-furnace 3, inside main furnace chamber 1, makes a part
Coal dust gas under the oxygen debt environment of high temperature generates a large amount of CO, and the situation for avoiding 1 local temperature of main furnace chamber excessively high is effectively reduced
The discharge of NOx, and CO can turn, this reduces the discharges of a part of NOx by a part of NOx reduction.Inside secondary-furnace 3, CO
It burns again after being mixed with uncombusted coal dust with the burnout degree filled into, improves the burn-off rate of coal dust.4 edge of back-end ductwork
Smoke movement direction is disposed with convective region 7 in furnace, further increases the service efficiency of heat, and SCR denitration area 8 is arranged, right
Flue gas carries out denitration process, avoids pollution environment.
The main furnace chamber 1 and 3 surrounding of secondary-furnace adhere to fin panel casing 9, the air outlet point of the air preheater 5
Burner 2, secondary air duct and burnout degree air outlet 6 are not connected by pipeline.
As shown in figure 3, in order to utilize staged air distribution technological means, so that the coal dust in region gas under the oxygen debt environment of high temperature
Body generates a large amount of CO, reduces the discharge of NOx, partially surrounded on the main furnace chamber 1 main furnace chamber 1 be arranged at intervals with four groups it is mutually flat
Capable secondary air duct, every group of secondary air duct include surrounding main furnace chamber 1 and two secondary air ducts air inlet in same plane setting
Pipe 10 is provided with an air inlet 11 and four spouts 12 on each secondary air duct blast pipe 10, and the air-flow that spout 12 sprays is with 0
The circle of contact form that ~ 15 degree of angle is formed is blown into main furnace chamber 1；The intake of four groups of secondary air ducts is accounted for into the total wind of boiler
The 20% of amount.
As shown in figure 3, being sent to master in the form of the circle of contact to reach four spouts 12 of each secondary air duct blast pipe 10
Inside burner hearth 1, coal dust is made to mix well with air the burn-off rate for uniformly improving coal dust, the four of each secondary air duct blast pipe 10
A spout 12 is respectively arranged at the surrounding of corresponding burner 2.
As shown in figure 4, reducing the temperature of flue gas in order to which the heat that flue gas contains is absorbed and utilized again, heat is improved
The conversion ratio of amount, the economizer are provided with two-stage, including the level-one economizer 13 being arranged along smoke movement direction and second level
Economizer 14；13 lower end of level-one economizer is provided with return water import 15, and the water outlet of 14 upper end of second level economizer is connected by pipeline
Convective region 7 and fin panel casing 9 in logical furnace.
The burnout degree is sent by circulating fan, and the air quantity of feeding accounts for 10% into boiler total blast volume, the burning
The intake of device 2 accounts for 70% into boiler total blast volume.
Finally, it should be noted that obviously, the above embodiment is merely an example for clearly illustrating the present invention, and simultaneously
The non-restriction to embodiment.For those of ordinary skill in the art, it can also do on the basis of the above description
Other various forms of variations or variation out.There is no necessity and possibility to exhaust all the enbodiments.And thus drawn
The obvious changes or variations that Shen goes out are still in the protection scope of this invention.
Claims (1)
1. a kind of twin furnace coal dust gasification low nitrogen burning Industrial Boiler, which is characterized in that including vertically-mounted main furnace chamber, main furnace
Thorax is provided with burner, and main furnace chamber rear portion close installation has secondary-furnace, and secondary-furnace rear portion close installation has back-end ductwork；Main furnace chamber
Lower end is connected to secondary-furnace lower end, and secondary-furnace upper end is connected to back-end ductwork upper end, and back-end ductwork lower end is connected to economizer, on economizer
End is provided with air preheater；Part parallel interval is provided with multiple groups secondary air duct, the main furnace chamber on the main furnace chamber
With burnout degree air outlet is partially provided under secondary-furnace, the back-end ductwork is disposed in furnace along smoke movement direction
Convective region and SCR denitration area；The main furnace chamber and secondary-furnace surrounding adhere to fin panel casing；The air preheater goes out
Air port connects burner, secondary air duct and burnout degree air outlet by pipeline respectively；
Main furnace chamber is partially surrounded on the main furnace chamber is arranged at intervals with four groups of secondary air ducts being parallel to each other, every group of secondary air duct
Including being arranged around main furnace chamber and on two secondary air duct blast pipes of same plane setting, each secondary air duct blast pipe
There are an air inlet and four spouts, the air-flow that spout sprays is blown into main furnace chamber in the form of the circle of contact that 0 ~ 15 degree of angle is formed；
The intake of four groups of secondary air ducts accounts for 20 ~ 35% into boiler total blast volume；
Four spouts of each secondary air duct blast pipe are respectively arranged at the surrounding of corresponding burner；
The economizer is provided with two-stage, including the level-one economizer and second level economizer being arranged along smoke movement direction；One
Grade economizer lower end is provided with return water import, and the water outlet of second level economizer upper end is connected to convective region and membrane type in furnace by pipeline
Water-cooling wall；
The burnout degree is sent by circulating fan, and the air quantity of feeding accounts for 5 ~ 10% into boiler total blast volume；
The intake of the burner accounts for 60 ~ 80% into boiler total blast volume.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610745593.3A CN106168376B (en) | 2016-08-29 | 2016-08-29 | A kind of twin furnace coal dust gasification low nitrogen burning Industrial Boiler |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610745593.3A CN106168376B (en) | 2016-08-29 | 2016-08-29 | A kind of twin furnace coal dust gasification low nitrogen burning Industrial Boiler |
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| CN106168376A CN106168376A (en) | 2016-11-30 |
| CN106168376B true CN106168376B (en) | 2019-01-04 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107152672A (en) * | 2017-05-05 | 2017-09-12 | 张家港格林沙洲锅炉有限公司 | Low NOXDouble drum gas fired-boilers |
| CN107314367A (en) * | 2017-07-25 | 2017-11-03 | 无锡华光锅炉股份有限公司 | Pulverized-coal fired boiler arrangement structure |
| CN110645567A (en) * | 2019-10-29 | 2020-01-03 | 辽宁绿源能源环保科技集团有限责任公司 | Pulverized coal boiler structure and pulverized coal combustion method |
| CN113819455B (en) * | 2021-07-22 | 2024-03-08 | 华能巢湖发电有限责任公司 | Method and equipment for reducing boiler NOx in multiple sections |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS6069410A (en) * | 1983-08-25 | 1985-04-20 | Mitsubishi Heavy Ind Ltd | Coal burning combined plant |
| CN105114944B (en) * | 2015-09-17 | 2018-02-16 | 西安西热锅炉环保工程有限公司 | A kind of tangential boiler Researched of Air Staging Combustion Burning Pulverized Coal vertical-horizontal combination arrangement after-flame wind system |
| CN105485894A (en) * | 2015-12-23 | 2016-04-13 | 杭州燃油锅炉有限公司 | Pulverized coal type water heating boiler |
| CN205403139U (en) * | 2016-03-14 | 2016-07-27 | 天津宝成机械制造股份有限公司 | Low nitrogen buggy boiler |
| CN205919314U (en) * | 2016-08-29 | 2017-02-01 | 营口绿源锅炉有限责任公司 | Double -furnace thorax coal powder gasification low -nitrogen combustion industrial boiler |
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Address after: 115000 No.121 Xinlian street, Yingkou District, Yingkou (Liaoning) pilot Free Trade Zone, Yingkou City, Liaoning Province Patentee after: Liaoning Lvyuan Energy Environmental Protection Technology Group Co.,Ltd. Address before: 115000, No. 3, iron and steel, Yingkou District, Liaoning, China Patentee before: YINGKOU LVYUAN BOILER Co.,Ltd. |