CN108105765A - A kind of low NOx steady burning burners in boiler - Google Patents
A kind of low NOx steady burning burners in boiler Download PDFInfo
- Publication number
- CN108105765A CN108105765A CN201711310258.1A CN201711310258A CN108105765A CN 108105765 A CN108105765 A CN 108105765A CN 201711310258 A CN201711310258 A CN 201711310258A CN 108105765 A CN108105765 A CN 108105765A
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- Prior art keywords
- pipe
- wind
- low nox
- steady burning
- circumference
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- 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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Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 238000002485 combustion reaction Methods 0.000 abstract description 21
- 239000000446 fuel Substances 0.000 abstract description 7
- 206010020843 Hyperthermia Diseases 0.000 abstract description 2
- 238000004939 coking Methods 0.000 abstract description 2
- 238000010438 heat treatment Methods 0.000 abstract description 2
- 230000036031 hyperthermia Effects 0.000 abstract description 2
- 239000003245 coal Substances 0.000 description 15
- 239000002817 coal dust Substances 0.000 description 10
- 230000000694 effects Effects 0.000 description 10
- 238000000034 method Methods 0.000 description 8
- 239000000843 powder Substances 0.000 description 7
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000001464 adherent effect Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000003134 recirculating effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 210000004894 snout Anatomy 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D1/00—Burners for combustion of pulverulent fuel
-
- 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
- F23L13/00—Construction of valves or dampers for controlling air supply or draught
-
- 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
- F23L9/00—Passages or apertures for delivering secondary air for completing combustion of fuel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2201/00—Burners adapted for particulate solid or pulverulent fuels
- F23D2201/20—Fuel flow guiding devices
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
The present invention relates to a kind of low NOx steady burning burners in boiler, including a wind pipe connected with burner hearth and circumference wind pipeline, a segment pipe of a wind pipe before it is passed through burner hearth is equipped with reducing pipe, straight pipe and diffuser successively, the maximum cross-section area of the reducing pipe is identical with diffuser maximum cross-section area, and the circumference wind pipeline is set in outside a wind pipe port of export.Compared with prior art, burner of the present invention can extend the length of flame, reduction center combustion area temperature, so as to reduce the generation of heating power type and fuel type NOx, be conducive to same layer burner mutually to ignite, fuel cost caused by reducing igniting, is conducive to being uniformly distributed for whole fire box temperature, reduces the coking and slagging problem as caused by localized hyperthermia.
Description
Technical field
The present invention relates to a kind of burners, and in particular to a kind of low NOx steady burning burners in boiler.
Background technology
With the development of China's economic and yearning of the people to good life, problem of environmental pollution is more and more prominent,
The concern being subject to is also more and more.Rich and influential family as industrial pollution --- power plant is being done each under the pressure of environmental requirement
Technological innovation is planted to reduce the discharge of pollutant.More than the 85% of China's generation current amount is all coal fired power generation, is had for number crowd
More coal-fired power plants undergoes technological transformation to each factory under environmental requirement underway, reduces NOx, can be from each side
Face is picked up, and such as flue gas area, such as SCR (selective catalytic reduction) method denitration, this method is efficient, but the problem of bringing is all
More, if temperature requirement is high, the reducing agents storage such as ammonia, liquefied ammonia is difficult and has certain danger.Control NOx's in combustion
Generation can reduce cost, reduce various risks.At present, the transformation of burner is more and more paid attention to.
Existing low-NOx combustor, such as ship type bluff body burner, the burner a wind snout it is built-in there are one fire
Flame stablizes ship, and installing one additional in the primary air piping before flame stabilization ship can be such that breeze airflow is divided into side towards the fire coal dust richness
Collection, and in the less air powder splitter of the fiery face coal dust of the back of the body, which can be very good to reduce the discharge of NOx.
A kind of method for reducing NOx is Researched of Air Staging Combustion Burning Pulverized Coal method, two sections of supply combustion systems of air used in burning point.First
50% or so of theoretical air requirement, reduces the air capacity in coal dust firing region, coal dust is made to enter burner hearth needed for stage supply burning
When be formed a fuel-rich regions, to reduce the generation of fuel type NOx；Second stage is imperfect combustion product by appropriate
The auxiliary air of supply reaches completely burned, controls the rising of flame temperature, and then controls thermal NO x and fuel type
The generation of NOx.
Another low NOx axial-flow type burner increases regurgitant volume by setting central tube, strengthens mixing, two layers of periphery
Secondary Air is all to export to form recirculating zone come auxiliary burner with flaring, reaches stable burning.Strengthen mixing with steady combustion ring, make
Coal dust stablizes burning.This axis stream burner has steady combustion effect well, reduces the generation of NOx to a certain extent.
Also a kind of similar tiny-oil ignition type burner due to being also tapered rear direct flaring, there is certain deep or light point
From effect.
More than four kinds of methods can reduce the generation of NOx to a certain extent.The method that bluff body is provided, since bluff body increases
Very big resistance is added, cowling panel below also increases the complexity of burner internal.Air staged combustion technology is theoretical
On be good, but burner hearth internal-combustion situation is more complicated, since coal-fired quality is different, it is difficult to control initial anoxycausis
When stablize burning.Complicated inside another axial-flow type, technical difficulty is high, is very difficult to apply in actual industrial production.It is simple tapered
Flaring pipeline makes First air generate very big disturbance immediately in burner hearth inlet, for quadrangle tangential circle type boiler, is unfavorable for extending
Flame travel, and then the effect of mutually igniting being unfavorable between same layer burner, another deep or light layered effect is not it is obvious that not allowing
Easily form more orderly velocity field and concentration field.
The content of the invention
The purpose of the present invention is exactly to solve the above-mentioned problems and provides a kind of low NOx in boiler and surely burn
Device.
The purpose of the present invention is achieved through the following technical solutions：
A kind of low NOx steady burning burners in boiler, including a wind pipe connected with burner hearth and circumference air hose
Road, a segment pipe of a wind pipe before it is passed through burner hearth successively be equipped with reducing pipe, straight pipe and diffuser, it is described gradually
The maximum cross-section area of the draw is identical with diffuser maximum cross-section area, and the circumference wind pipeline is set in outside a wind pipe
Portion.In the technical program, burner a wind pipe is arranged to first contract and expands afterwards and is set between reducing pipe and diffuser flat
Coal dust is compressed at burner inlet as developed regime by straight tube, and coal powder density improves, and has one section of coal dust abundant in pipe
After mixing developing stage, in burner outlet flaring, since pulverized coal particle is bigger than air quality, according to inertia, coal dust is in jet pipe
Centre concentration is remained unchanged with compressed concentration, and the coal powder density of close jet pipe near-wall makes coal powder density due to flaring
Thin out, as a result, in burner stove tank entrance, First air concentration is divided into " light-dense-light " type air-coal separating, air-coal separating
Burning makes it in the case where not changing whole excess air coefficient, has high concentration pulverized coal, low latitude gas ratio, tool in combustion zone
There is a high reducing atmosphere, therefore with good low NOx combustion characteristic, this burner is because coal powder density is relatively in the middle part of pipeline
Height has steady combustion effect well, especially under underrun, be conducive to the lengthening of flame combustion stroke, avoid coal dust collection
Middle burning reduces center combustion area flame temperature, increases combustion disturbance, and then more has the effect for reducing thermal NO x generations.
Further, the reducing pipe is identical with diffuser maximum cross-section area, with reach it is tapered before and flaring after once
Wind mean wind speed, mass flow are identical, and whole excess air coefficient remains unchanged；Its maximum cross-section area and minimum cross-sectional area
The ratio between be 1.2-3：1, to ensure that resistance should not be excessive.
Further, a wind pipe rectangular in cross-section or circle, surrounding air pipeline section are in " returning " shape or annulus
Shape.
Further, the ratio between the surrounding air pipe outlet area of section and a wind pipe exit area are 1：2-
3。
Further, the ratio between the circumference wind pipeline and the wind speed of a wind pipe are 1.5-3：1, it can so make surrounding air
After injecting burner hearth flue gas, combustion centre's partial heat is taken away, reduces combustion centre's temperature.
Further, a wind pipe outlet is equipped with the deflector with guide functions, burns beneficial to posterior stabilization.
Further, the deflector uses grid.
Further, the surrounding air pipe outlet, which is equipped with, expands flame angle, and the circumference wind pipeline connects surrounding air bellows.
Further, the clutch of adjustable First air incident angle is connected on the inlet tube of a wind pipe,
Adjustable First air incident angle so as to control flame combustion center, has apparent make in underrun regulation and control
With.
Further, a wind pipe and the smooth setting of surrounding air inner-walls of duct, reduce the tapered mistake of burner tubes
The resistance that journey generates.
Compared with prior art, a wind pipe of burner of the present invention is after simple compression, and there are one coal dust velocity fields
With the developing stage of concentration field, internal drag is relatively small, and it is " light-dense-light " that First air, which enters the coal powder density formed in burner hearth,
Type since intermediate coal powder density is high, can form certain reproducibility atmosphere, and center wind velocity is relatively high, and air-coal separating is stablized,
The length of flame can be extended, center combustion area temperature is reduced, so as to reduce the generation of heating power type and fuel type NOx, be conducive to same layer
Burner mutually ignites, and fuel cost caused by reducing igniting has separately accordingly increased the catalyst for pollutant process
Service life.Another cooperation surrounding air can effectively prevent that flame is adherent, reduce the coking and slagging problem as caused by localized hyperthermia.
Description of the drawings
Fig. 1 is the structure diagram of the low NOx steady burning burners of the present invention；
Fig. 2 is a wind pipe and circumference wind pipeline rough schematic view；
Fig. 3 is a wind pipe and surrounding air pipeline section schematic diagram in embodiment；
In figure：1- a wind pipes；11- reducing pipes；12- is straight pipe；13- diffusers；2- circumference wind pipelines；3- water conservancy diversion
Plate；4- expands flame angle；5- clutch；6- surrounding air bellows.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment 1
A kind of low NOx steady burning burners in boiler, including a wind pipe 1 connected with burner hearth and circumference air hose
Road 2 a, as shown in Figure 1, segment pipe of a wind pipe 1 before it is passed through burner hearth is equipped with reducing pipe 11,12 and of straight pipe successively
Diffuser 13, circumference wind pipeline 2 are set in outside a wind pipe 1.Reducing pipe 11 is identical with 13 maximum cross-section area of diffuser,
As shown in Figure 2,3, the ratio between maximum cross-section area and minimum cross-sectional area are about 1.2-3：1,1 rectangular in cross-section of a wind pipe
Or it is circular, surrounding air pipeline section is in " returning " shape or circular ring shape, and surrounding air pipe outlet area of section is exported with a wind pipe
The ratio between area of section is 1：2-3.The ratio between circumference wind pipeline and the wind speed of a wind pipe are 1.5-3：1, a wind pipe outlet
Equipped with the grid with guide functions, surrounding air pipe outlet, which is equipped with, expands flame angle, circumference wind pipeline connection surrounding air bellows, once
The clutch of adjustable First air incident angle is connected on the inlet tube of wind pipeline, First air incident angle is adjusted, so as to
Flame combustion center is controlled, there is apparent effect, a wind pipe and circumference wind pipeline in underrun regulation and control
Inner wall smooth reduces the resistance that the tapered process of burner tubes generates.
First air primarily serves pulverized coal conveying effect and in addition provides required oxygen amount when igniting, the combustion-supporting effect of surrounding air,
SOFA wind is typically provided on main burner top, for adjusting excess air coefficient, wherein First air wind rate accounts for total blast volume
27%, 8%, the SOFA wind wind rates that surrounding air wind rate accounts for total blast volume account for the 33% of total blast volume, and other Secondary Air wind rates account for always
The 32% of air quantity.This burner is DC burner, and First air is first compressed in combustor nozzle converging transition, after concentration
Flaring after development pipeline into hearth combustion after jet pipe flaring, due to special internal structure, forms air-coal separating.Due in
More greatly, corresponding surrounding air and internal-combustion area be not abundant for First air speed around the First air speed relative duct size of the heart
Mixing, postpones burning time, forms reducing atmosphere, main burning area does not have concentrated combustion at this time, therefore temperature is not reaching to heat
The temperature range that power type NOx is largely generated, so as to fulfill NOx generations are inhibited.The arrangement of SOFA wind can preferably control excessive sky
Gas coefficient and reproducibility atmosphere section preferably inhibit NOx generations.
The above is only the case study on implementation of the present invention, and limitation in any form is not done to the present invention, although
The implementation case is one of relatively good scheme, is not being departed from burner internal structure technology aspects of the present invention,
Suitably appropriate optimization can be made using the structure in the present invention or content or be modified to the equivalence enforcement side of equivalent variations effect
Case.In every case without departing from the structure technology plan content in the present invention, technical spirit according to the invention carries out letter to above-mentioned case
Modification, the optimization of list, equivalent variations and modification, belong in the present invention program technical scope.
Claims (10)
1. a kind of low NOx steady burning burners in boiler, including a wind pipe connected with burner hearth and circumference wind pipeline,
It is characterized in that, a segment pipe of a wind pipe before it is passed through burner hearth is equipped with reducing pipe, straight pipe and flaring successively
Pipe, the maximum cross-section area of the reducing pipe is identical with diffuser maximum cross-section area, and the circumference wind pipeline is set in once
Outside wind pipeline.
2. a kind of low NOx steady burning burners in boiler according to claim 1, which is characterized in that described tapered
Pipe is identical with diffuser maximum cross-section area, and the ratio between the maximum cross-section area of reducing pipe and diffuser and minimum cross-sectional area are
1.2-3：1.
3. a kind of low NOx steady burning burners in boiler according to claim 1, which is characterized in that it is described once
Wind pipeline rectangular in cross-section or circle, surrounding air pipeline section are in " returning " shape or circular ring shape.
A kind of 4. low NOx steady burning burners in boiler according to claim 3, which is characterized in that the circumference
The ratio between wind pipeline exit area and a wind pipe exit area are 1：2-3.
A kind of 5. low NOx steady burning burners in boiler according to claim 1, which is characterized in that the circumference
The ratio between wind pipeline and the wind speed of a wind pipe are 1.5-3：1.
6. a kind of low NOx steady burning burners in boiler according to claim 1, which is characterized in that it is described once
Wind pipeline outlet is equipped with the deflector with guide functions.
A kind of 7. low NOx steady burning burners in boiler according to claim 6, which is characterized in that the water conservancy diversion
Plate uses grid.
A kind of 8. low NOx steady burning burners in boiler according to claim 1, which is characterized in that the circumference
Wind pipeline outlet, which is equipped with, expands flame angle, and the circumference wind pipeline connects surrounding air bellows.
9. a kind of low NOx steady burning burners in boiler according to claim 1, which is characterized in that it is described once
The clutch of adjustable First air incident angle is connected on the inlet tube of wind pipeline.
10. a kind of low NOx steady burning burners in boiler according to claim 1, which is characterized in that it is described once
Wind pipeline and the smooth setting of surrounding air inner-walls of duct.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711310258.1A CN108105765B (en) | 2017-12-11 | 2017-12-11 | Low NOx stable combustion burner for boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711310258.1A CN108105765B (en) | 2017-12-11 | 2017-12-11 | Low NOx stable combustion burner for boiler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108105765A true CN108105765A (en) | 2018-06-01 |
| CN108105765B CN108105765B (en) | 2024-08-27 |
Family
ID=62209460
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711310258.1A Active CN108105765B (en) | 2017-12-11 | 2017-12-11 | Low NOx stable combustion burner for boiler |
Country Status (1)
| Country | Link |
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| CN (1) | CN108105765B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114184222A (en) * | 2021-10-11 | 2022-03-15 | 华能(浙江)能源开发有限公司玉环分公司 | Powder accumulation fire prevention detection method and device for pulverized coal pipe |
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|---|---|---|---|---|
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| JPH05272711A (en) * | 1992-03-25 | 1993-10-19 | Kawasaki Heavy Ind Ltd | Low nox burner with fine coal |
| WO2012163107A1 (en) * | 2011-05-27 | 2012-12-06 | 上海锅炉厂有限公司 | Dense-phase swirl pulverized coal burner |
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| CN104832918A (en) * | 2015-05-05 | 2015-08-12 | 集美大学 | Novel cyclone bias pulverized coal burner |
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| CN106594718A (en) * | 2016-12-28 | 2017-04-26 | 浙江宜清环境技术有限公司 | Parallel-flow type oxygen-enriched burner device used for pulverized coal boiler |
| CN107166379A (en) * | 2017-06-20 | 2017-09-15 | 哈尔滨工业大学 | Ultralow NOxMicro-oil ignition coal powder combusting device |
| CN207599694U (en) * | 2017-12-11 | 2018-07-10 | 上海电力学院 | A kind of low NOx steady burning burners in boiler |
-
2017
- 2017-12-11 CN CN201711310258.1A patent/CN108105765B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1352578A1 (en) * | 1986-03-20 | 1987-11-15 | Специальное Конструкторско-Технологическое Бюро Треста "Электроюжмонтаж" | Cable load |
| JPH05272711A (en) * | 1992-03-25 | 1993-10-19 | Kawasaki Heavy Ind Ltd | Low nox burner with fine coal |
| WO2012163107A1 (en) * | 2011-05-27 | 2012-12-06 | 上海锅炉厂有限公司 | Dense-phase swirl pulverized coal burner |
| CN103277793A (en) * | 2013-05-27 | 2013-09-04 | 杨占春 | Thick and thin separation rotational flow pulverized coal burner |
| CN104832918A (en) * | 2015-05-05 | 2015-08-12 | 集美大学 | Novel cyclone bias pulverized coal burner |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114184222A (en) * | 2021-10-11 | 2022-03-15 | 华能(浙江)能源开发有限公司玉环分公司 | Powder accumulation fire prevention detection method and device for pulverized coal pipe |
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| Publication number | Publication date |
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| CN108105765B (en) | 2024-08-27 |
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