CN102705818B - Wall-attached wind distribution method of boiler combustor - Google Patents
Wall-attached wind distribution method of boiler combustor Download PDFInfo
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- CN102705818B CN102705818B CN201210209196.6A CN201210209196A CN102705818B CN 102705818 B CN102705818 B CN 102705818B CN 201210209196 A CN201210209196 A CN 201210209196A CN 102705818 B CN102705818 B CN 102705818B
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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
Abstract
The invention provides a wall-attached wind distribution method of a boiler combustor. A secondary wind is led out from an outlet of an air preheater, the front part of the secondary wind is connected with a main combustor through a first secondary wind duct, and the rear part of the secondary wind is connected with a separation over-fire wind bellows through a second secondary wind duct. The wall-attached wind distribution method is characterized in that the front part of the secondary wind is divided into three gusts, the first gust is jetted into a hearth through a first secondary wind nozzle and a second secondary wind nozzle in the main combustor, the second gust is jetted into the hearth through circumferential wind nozzles around primary wind/pulverized coal nozzles, and the third gust is jetted into the hearth through wall-attached wind nozzles arranged on at least one layer of side surface of the primary wind/pulverized coal nozzles. The wall-attached wind distribution method of the boiler combustor, which is provided by the invention, overcomes defects in the prior art; through arranging the wall-attached wind nozzles on one side or two sides of the primary wind/pulverized coal nozzles, slag-bonding and high-temperature corrosion of the hearth can be prevented; and the wall-attached wind distribution method is suitable for high sulphur coal, thereby enhancing the boiler adaptability to the coal type change.
Description
Technical field
The present invention relates to the adherent wind arrangement of a kind of boiler-burner, belong to boiler combustion device technical field.
Background technology
(NOx comprises NO, NO to nitrogen oxide
2, N
2o) be the gas that can cause atmospheric environment severe contamination, one of main source being considered to atmosphere pollution.The NOx discharged because of combustion of fossil fuels at world wide every year occupies very large ratio in all NOx emission.The environmental regulation of increasingly stringent requires the combustion technology that research and development are advanced, to reduce the discharge of the pollutants such as NOx.The maximum feature of current China Energy Mix (accounts for more than 70%) based on coal, and coal burning will produce a large amount of NOx, all can have a negative impact to economical and efficient growth and ecological environment.
The technical measures of the conventional coal-fired power station boiler NOx emission of current existing control can be divided into flue gases purification and low NOx combusting technology two class.Flue gases purification is the final discharge capacity reducing NOx by removing NOx in flue gas.Thermal power plant NOx reduces discharging and realizes mainly through the operation mode of advanced person, low NOx combusting technology and tail flue gas denitration technology.Tail flue gas denitration technology is relatively more thorough, but its investment is expensive with operation and maintenance cost.Concentration of emission can be reduced to 150 ~ 350mg/m by current advanced low NOx combusting technology
3below, and along with the minimizing of NOx generation amount in stove, also can reduce the operating cost of afterbody denitrification apparatus.One of core of low NOx combusting technology is grading combustion technology, and comprise air classification and fuel staging two kinds, fuel staging techniques is also called fuel reburning technology.The main flow low NOx combusting technology that domestic and international pulverized-coal fired boiler adopts the most extensively, technology is the most ripe is air classification technology, and it is generally adopted at the station boiler of China.
The classification of burner hearth integrated air the air capacity needed for burning is divided into two-stage send into, first-stage burning district for burner provide account for coal dust burn completely required total blast volume 60% ~ 90% air, fuel first burns under the rich fuel condition of anoxic.Secondary firing district will remain air quantity with the input of auxiliary air (burnout degree) form, become oxygen-enriched combusting district.Be provided with in the middle of I and II combustion zone average oxygen concentration close to zero the reducing zone with reducing atmosphere, the reducing medium in this region plays an important role for reducing the NOx generated.In stove, integrated air classification technique can make NOx generation amount reduce by 30% ~ 70%, and the degree of air classification is larger, and the share namely shared by burnout degree is larger, and the degree that NOx reduces discharging is larger.
To burn completely 60% ~ 90% of requirement because the air provided for burner in first-stage burning district accounts for coal dust, the excess air coefficient in whole main burner region is less than 1.0, be in reducing atmosphere, under this atmosphere, the ash fusion point of coal is by reduction by 50 DEG C ~ 100 DEG C, and this easily causes furnace wall cooling to occur the situation of Serious Slagging; And the H in reducibility gas
2the corrosive gas such as S, easily cause furnace wall cooling to occur the situation that critical high temperature corrodes.For preventing above-mentioned situation, prior art is by measures such as the imaginary circle of reduction First air/breeze airflow, the arrangements of employing First air/breeze airflow traditional method of indicating the pronunciation of a Chinese character, reduce the diameter of fireball, prevent First air/breeze airflow from washing away water-cooling wall, thus prevent furnace wall cooling from occurring the situation of slagging scorification and high temperature corrosion.
For certain 600MW super critical boiler, as shown in Figure 1, Fig. 2 is the I-I sectional view of Fig. 1 to the arrangement of the First air/coal nozzle of existing combustion apparatus, overfire air jet, burnout degree nozzle, and Fig. 3 is the II-II sectional view of Fig. 1.Every platform boiler 1 configures 6 coal pulverizers 3, and numbering is respectively A, B, C, D, E, F.Burner hearth 2 is made up of four sides water-cooling wall 7, each angle of burner hearth 2 is furnished with one group of main burner 8, often organize main burner 8 and vertically arrange 6 First air/coal nozzles 5 in interval, the numbering as 6 the First air/coal nozzles 5 in a certain angle is respectively A1, B1, C1, D1, F1, F1.Often organize burner 8 and vertically arrange 2 overfire air jets 6 and 5 overfire air jets 16.The center line of the First air/coal nozzle 5 of corner burner 8 forms imaginary circle 9 in burner hearth 2, the center line of the first four jiaos of overfire air jets 6 also forms little imaginary circle 9 in burner hearth, the large imaginary circle 17 that the center line of the second four jiaos of overfire air jets 16 becomes diameter larger at freeze profile.Coal pulverizer 3 is connected with First air/coal nozzle 5 by pulverized coal channel 4, and every platform coal pulverizer 3 outlet has four pulverized coal channels 4, is connected with 4 First air/coal nozzles 5 of same absolute altitude, such as coal pulverizer A be numbered A1, A2, A3, A4 totally four First air/coal nozzles 5 connect.
Secondary Air is drawn from air preheater 13, by the first secondary air duct 14 and jiao overfire air jet 6 of the first four in main burner 8, the second four jiaos of overfire air jets 16, and the gap of First air/coal nozzle 5 surrounding is connected, this part Secondary Air adds the combustion air amount that First air is total, be less than the coal dust spraying into burner hearth 2 by First air/coal nozzle 5 to burn completely required theoretical air requirement, namely the excess air coefficient in main burner 8 region is less than 1.0.Remaining part Secondary Air by the second secondary air duct 15 be separated burnout degree bellows 10 and connect, spraying into burner hearth by being arranged on the separation burnout degree nozzle 12 be separated in burnout degree bellows 10, completing the process of whole burning.By such combustion method, the excess air coefficient in main burner region can be made to be less than 1.0, reduce the growing amount of NOx.
In above-mentioned existing design example, in order to the NOx discharge of boiler is reduced to lower value, need to strengthen the ratio of burnout degree, this will cause the overall excess air coefficient in main burner region lower, minimumly may reach 0.60 ~ 0.70.Although take the imaginary circle of reduction First air/breeze airflow, adopt the measures such as the arrangement of First air/breeze airflow traditional method of indicating the pronunciation of a Chinese character, the adherent smoke components of on-the-spot test, often can not meet and ensure oxygen content>=0.5% in adherent flue gas and H
2the requirement of S content≤100ppm.How to ensure that boiler is while reaching low NOx drainage, ensureing the adherent smoke components of safety in burner hearth, is problem demanding prompt solution.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of adherent wind arrangement with low NOx drainage amount, low Boiler Furnace slagging tendency and low furnace water cooling wall high-temperature corrosion tendency.
In order to solve the problems of the technologies described above, technical scheme of the present invention is to provide the adherent wind arrangement of a kind of boiler-burner, and Secondary Air is drawn from the outlet of air preheater, and forward part Secondary Air is connected with main burner by the first secondary air duct; Rear section Secondary Air by the second secondary air duct be separated burnout degree bellows and connect, and spray into burner hearth by being located at the separation burnout degree nozzle be separated in burnout degree bellows, it is characterized in that: described forward part Secondary Air is divided into again three strands, first strand sprays into burner hearth by the first overfire air jet in main burner and the second overfire air jet, second strand sprays into burner hearth by the surrounding air nozzle of the First air in main burner/coal nozzle surrounding, and the 3rd strand sprays into burner hearth by the adherent wind nozzle of the First air/coal nozzle side being located at least one deck.
Preferably, described adherent wind nozzle be located at First air/coal nozzle to fiery side.
Preferably, described adherent wind nozzle is located at the back-fire side of First air/coal nozzle.
Preferably, described First air/coal nozzle be equipped with adherent wind nozzle to fiery side and back-fire side.
Preferably, during boiler rated load, the Secondary Air air quantity spraying into burner hearth by described adherent wind nozzle accounts for 2% ~ 8% of boiler total combustion air amount.
A kind of boiler-burner provided by the invention adherent wind arrangement is by arranging adherent wind nozzle in the one or both sides of First air/coal nozzle, it is three strands by the part secondary air separating be connected with main burner by the first secondary air duct, the air quantity of adherent wind is regulated in operation, adherent wind nozzle is by the guide plate of its inside, make the emission direction of air-flow and adjacent water-cooling wall centerline parallel, this part air-flow does not blow to burner hearth center, but spread along water-cooling wall, postpone the process of this part air and pulverized coal particle generation combustion reaction, so just serve and keep water-cooling wall adherent region flue gas to be oxidizing atmosphere, thus prevent the situation of Boiler Furnace slagging and high temperature corrosion, can while obtaining low NOx generation amount, meet oxygen content>=0.5% in adherent flue gas and H
2the requirement of S content≤100ppm.
The adherent wind arrangement of a kind of boiler-burner provided by the invention overcomes the deficiencies in the prior art, by arranging adherent wind nozzle in the one or both sides of First air/coal nozzle, Boiler Furnace slagging and high temperature corrosion can be prevented, and be applicable to sulphur coal, add the adaptability of boiler to coal type change.
Accompanying drawing explanation
Fig. 1 is the elevation of existing burner air distribution mode;
Fig. 2 is I-I sectional view in Fig. 1;
Fig. 3 is II-II sectional view in Fig. 1;
Fig. 4 is a kind of boiler-burner provided by the invention adherent wind arrangement schematic diagram in embodiment 1;
Fig. 5 is a kind of boiler-burner provided by the invention adherent wind arrangement schematic diagram in embodiment 2;
Fig. 6 is a kind of boiler-burner provided by the invention adherent wind arrangement schematic diagram in embodiment 3;
Description of reference numerals
1-boiler; 2-burner hearth; 3-coal pulverizer; 4-pulverized coal channel; 5-First air/coal nozzle; 6-first overfire air jet; 7-water-cooling wall; 8-burner; The little imaginary circle of 9-; 10-is separated burnout degree bellows; The adherent wind nozzle of 11-; 12-is separated burnout degree nozzle; 13-air preheater; 14-first secondary air duct; 15-second secondary air duct; 16-second overfire air jet; The large imaginary circle of 17-.
Detailed description of the invention
For making the present invention become apparent, hereby with four preferred embodiments, and accompanying drawing is coordinated to be described in detail below.
Embodiment 1
Composition graphs 1 ~ Fig. 3, every platform boiler 1 configures 6 coal pulverizers 3, and numbering is respectively A, B, C, D, E, F.Burner hearth 2 is made up of four sides water-cooling wall 7, each angle of burner hearth 2 is furnished with one group of main burner 8, often organize main burner 8 and vertically arrange 6 First air/coal nozzles 5 in interval, the numbering as 6 the First air/coal nozzles 5 in a certain angle is respectively A1, B1, C1, D1, E1, F1.Often organize burner 8 and vertically arrange 2 overfire air jets 6 and 5 overfire air jets 16.The center line of the First air/coal nozzle 5 of corner burner 8 forms imaginary circle 9 in burner hearth 2, the center line of the first four jiaos of overfire air jets 6 also forms little imaginary circle 9 in burner hearth, the large imaginary circle 17 that the center line of the second four jiaos of overfire air jets 16 becomes diameter larger at freeze profile.Coal pulverizer 3 is connected with First air/coal nozzle 5 by pulverized coal channel 4, and every platform coal pulverizer 3 outlet has four pulverized coal channels 4, is connected with 4 First air/coal nozzles 5 of same absolute altitude, such as coal pulverizer A be numbered A1, A2, A3, A4 totally four First air/coal nozzles 5 connect.
Secondary Air is drawn from the outlet of air preheater 13, and forward part Secondary Air is connected with main burner 8 by the first secondary air duct 14; Rear section Secondary Air by the second secondary air duct 15 be separated burnout degree bellows 10 and connect, and spray into burner hearth 2 by being located at the separation burnout degree nozzle 12 be separated in burnout degree bellows 10.
Composition graphs 4, forward part Secondary Air is divided into again three strands, first strand sprays into burner hearth 2 by the first overfire air jet 6 in main burner 8 and the second overfire air jet 16, second strand sprays into burner hearth 2 by the surrounding air nozzle of First air/coal nozzle 5 surrounding in main burner 8, and the 3rd strand sprays into burner hearth 2 by First air/coal nozzle 5 of being arranged at least one deck to the adherent wind nozzle 11 of fiery side.
Be arranged in adherent wind nozzle 11 to fiery side by the guide plate of its inside, make the emission direction of air-flow and adjacent water-cooling wall centerline parallel, this part air-flow does not blow to burner hearth center, but spread along water-cooling wall, postpone the process of this part air and pulverized coal particle generation combustion reaction, so just serve and keep water-cooling wall adherent region flue gas to be oxidizing atmosphere, thus prevent the situation of Boiler Furnace slagging and high temperature corrosion.
The main burner 8 at a boiler angle comprise six to fiery side adherent wind nozzle 11, a boiler totally four main burners 8, comprise altogether 24 to fiery side adherent wind nozzle 11, during boiler rated load, total Secondary Air air quantity spraying into burner hearth by 24 adherent wind nozzles 11 accounts for 4% of boiler total combustion air amount.
Embodiment 2
Composition graphs 5, by the back-fire side that to fiery side change First air/coal nozzle 5 of the position of wind nozzle 11 adherent in embodiment 1 from First air/coal nozzle 5.Other structures are with embodiment 1.
Embodiment 3
Composition graphs 6, by position the changing into fiery side from First air/coal nozzle 5 of wind nozzle 11 adherent in embodiment 1, First air/coal nozzle 5 to fiery side and the back of the body fire survey, be respectively furnished with one to fiery side adherent wind nozzle 11.Other structures are with embodiment 1.
Embodiment 4
The difference of the present embodiment and embodiment 1 is, arranges adherent wind nozzle 11 only at upper three layers of each First air/coal nozzle 5 to fiery side, and the main burner 8 at each angle arranges three adherent wind nozzles 11 altogether.Adherent wind nozzle 11 is not arranged in the side of lower three layers of First air/coal nozzle 5.
Other structures are with embodiment 1.
Claims (2)
1. the adherent wind arrangement of boiler-burner, Secondary Air is drawn from the outlet of air preheater (13), and forward part Secondary Air is connected with main burner (8) by the first secondary air duct (14), rear section Secondary Air by the second secondary air duct (15) be separated burnout degree bellows (10) and connect, and spray into burner hearth (2) by being located at the separation burnout degree nozzle (12) be separated in burnout degree bellows (10), it is characterized in that: described forward part Secondary Air is divided into again three strands, first strand sprays into burner hearth (2) by the first overfire air jet (6) in main burner (8) and the second overfire air jet (16), second strand sprays into burner hearth (2) by the surrounding air nozzle of First air/coal nozzle (5) surrounding in main burner (8), 3rd strand sprays into burner hearth (2) by the adherent wind nozzle (11) being located at First air/coal nozzle (5) side of at least one deck, adherent wind nozzle (11) is by the guide plate of its inside, make the emission direction of air-flow and adjacent water-cooling wall centerline parallel, this part air-flow does not blow to burner hearth center, but spread along water-cooling wall, postpone the process of this part air and pulverized coal particle generation combustion reaction,
Described adherent wind nozzle (11) be located at First air/coal nozzle (5) to fiery side and/or back-fire side.
2. the adherent wind arrangement of a kind of boiler-burner as claimed in claim 1, is characterized in that: during boiler rated load, and the Secondary Air air quantity spraying into burner hearth (2) by described adherent wind nozzle (11) accounts for 2% ~ 8% of boiler total combustion air amount.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201210209196.6A CN102705818B (en) | 2012-06-22 | 2012-06-22 | Wall-attached wind distribution method of boiler combustor |
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| CN201210209196.6A CN102705818B (en) | 2012-06-22 | 2012-06-22 | Wall-attached wind distribution method of boiler combustor |
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| CN102705818A CN102705818A (en) | 2012-10-03 |
| CN102705818B true CN102705818B (en) | 2014-12-24 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105509086B (en) * | 2015-12-02 | 2017-09-15 | 西安西热锅炉环保工程有限公司 | The adherent wind system of asymmetric high speed prevented and treated for the high temperature corrosion of coal-burning boiler burner hearth |
| CN107270278A (en) * | 2017-06-06 | 2017-10-20 | 国电科学技术研究院武汉电力技术分院 | A kind of new adherent wind method for arranging of station boiler |
| CN109469898A (en) * | 2018-11-13 | 2019-03-15 | 上海理工大学 | Prevent the boiler-burner of burning slagging |
| CN110454774A (en) * | 2019-09-05 | 2019-11-15 | 西安热工研究院有限公司 | A kind of new coal powder boiler low nitrogen burning system |
| CN111720816B (en) * | 2020-06-19 | 2022-08-30 | 江苏方天电力技术有限公司 | High-temperature corrosion prevention nozzle for coal-fired power plant |
| CN112696681A (en) * | 2021-01-13 | 2021-04-23 | 光大环境科技（中国）有限公司 | Secondary air nozzle, secondary air system and garbage incinerator |
| CN113108273A (en) * | 2021-05-24 | 2021-07-13 | 西安热工研究院有限公司 | Air distribution system with multistage regulation and control of wind and smoke |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2045059U (en) * | 1989-03-06 | 1989-09-27 | 中国科学院力学研究所 | Combined air nozzles for powdered coal boiler |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US3867909A (en) * | 1973-11-19 | 1975-02-25 | Foster Wheeler Corp | Slag prevention air slots in furnace sidewalls |
| SU1695039A1 (en) * | 1989-10-24 | 1991-11-30 | Сибирский Филиал Всесоюзного Теплотехнического Института Им.Ф.Э.Дзержинского | Furnace |
| DE19514302C2 (en) * | 1995-04-25 | 2001-11-29 | Alstom Power Boiler Gmbh | Process and combustion system for low-nitrogen heat generation |
| CN2735175Y (en) * | 2004-10-29 | 2005-10-19 | 宝山钢铁股份有限公司 | Multiphase cofiring low nitrogen oxide combustor |
| CN2786440Y (en) * | 2005-02-28 | 2006-06-07 | 哈尔滨工业大学 | Boiler with wall type arranged burner capable of preventing water-cooled wall from high temperature corrosion and slag bonding |
| CN101050854B (en) * | 2007-05-18 | 2010-05-26 | 哈尔滨工业大学 | W-shape flame boiler for preventing side wall water cooling wall slagging scorification |
| CN101706110A (en) * | 2009-11-17 | 2010-05-12 | 西安交通大学 | Near-wall air device for preventing high-temperature corrosion of water-cooled wall of power station boiler |
| CN101737771B (en) * | 2009-12-18 | 2012-02-01 | 上海锅炉厂有限公司 | Multistage over fire air distributing mode |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2045059U (en) * | 1989-03-06 | 1989-09-27 | 中国科学院力学研究所 | Combined air nozzles for powdered coal boiler |
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