CN101216173A - Double cyclone pulverized coal burner - Google Patents
Double cyclone pulverized coal burner Download PDFInfo
- Publication number
- CN101216173A CN101216173A CNA2007100509897A CN200710050989A CN101216173A CN 101216173 A CN101216173 A CN 101216173A CN A2007100509897 A CNA2007100509897 A CN A2007100509897A CN 200710050989 A CN200710050989 A CN 200710050989A CN 101216173 A CN101216173 A CN 101216173A
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- burner
- air duct
- main burner
- venturi section
- runner
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Abstract
The invention belongs to a dual-cyclone powder coal burner for power plant boilers; the invention comprises a central fan drum with a fuel gun and a Venturi segment as well as a bunching tube; a main nozzle with a flow channel and a Venturi segment inside a diversion collar and with a flared edge; a secondary air nozzle composed of a cyclone generator and a governor valve; a third air nozzle composed of a cyclone generator and a horn-shaped opening, as well as a corresponding air intake. The invention can effectively improve the radial distribution effects of interior thicker and exterior thinner in powder coal concentrate at a main spout of the burner; therefore, the invention has the perfect dense-light separation effect for powder coal; both the secondary and third air flowrate can be regulated conveniently; the flowrate ratio on the dense-light side is RQ being 0.9 to 1.0; the powder coal concentrate ratio on the dense-light side is Rc higher than 4.5; the flowing resistance factor is low and the flow speed distribution at the spout is ideal; the invention adapts to use together with boilers with rather high adaptability for coal specifies and load variations; the invention is characterized by perfect combustion stability, low emission of nitrogen oxides, and effectively avoiding fuel gun abrasion and pitting on the nozzles, as well as long service life and etc.
Description
Technical field
The invention belongs to and use the supporting injecting type turbulent burner of using of station boiler of fine coal, particularly a kind of burner main injection jet place coal powder density radial distribution is interior dense, outer light double cyclone pulverized coal burner, this burner and the corresponding supporting bias combustion of realizing ideal of boiler.
Background technology
Double cyclone pulverized coal burner is widely used in the station boiler of coal dust burning, to realize bias combustion.Be mainly the two wind turbulent burners of transferring of injecting type at present, as being that CN1125308A, name are called that disclosed " burner " promptly belongs to this class rotational flow pulverized coal burner in the patent documentation of " powdered coal burner " at publication number.Establish oil gun in this burner comprises and on tube wall, be provided with an annular throat, to being provided with flow splitter (partition wall) around center line between the spout inner chamber is separated into two concentric annular channels in this throat, with branch flow through throat portion from after be in dense, outer light wind, powder compound, also be provided with the main burner (force one wind powder mixing nozzle) of a flameholder at the spout front end, and annular, be arranged at that this nozzle body is outer with one heart, be equipped with one in each body and revolve (whirlpool) flow-generator and the bell-mouthed secondary of end band and three grades of air nozzles.Though it is simpler relatively that this powdered coal burner has structure, with the supporting characteristics such as bias combustion that also can realize to a certain extent of boiler.But owing to adopt the simple throat of knot to carry out disposable separation in the main burner, dense, the light separating effect of coal dust is relatively poor, also be provided with a cover by taper ring flat-plate (being horn mouth) and the flameholder of forming perpendicular to the annular plate of axis at its spout front end in addition, the annular plate of this stabilizer vertically extend in the runner of main burner outlet, its effect is exactly to hinder one-level air-flow (main burner air-flow) as barrier, with the air pressure, the help that reduce its downstream coal dust that ignites; Though the setting of this stabilizer helps the coal dust that ignites, smooth combustion, but because one-level (main burner) air-flow forms a recirculating zone opposite with emission direction because of its inhibition near spout, main burner position the deep or light separating effect that fine coal has been realized at its upstream that not only further increased the resistance of force one wind but also further reduction (destruction); In addition, this burner is not established flame in center air duct, the boiler running process and is scurried into spout by the power that refluxes and easily nozzle and flameholder are ablated; And oil gun directly is located in the main burner, oil gun is is also easily worn and torn by the high speed coal dust.Disadvantages such as thereby there is dense, the light inferior separating effect of coal dust in this background technology, influences effective application of dense-dilute burner combustion technology, and the bad adaptability that in the running ature of coal is changed, and oil gun is easy to wear, the nozzle oral area is easily ablated.
Summary of the invention
The objective of the invention is to design a kind of double cyclone pulverized coal burner at the defective that background technology exists, with improve burner main injection jet place coal powder density radial distribution be interior dense, outer light and two, three grades of air stream in burner hearth with the mixed effect of pulverized coal flame, make high concentration pulverized coal air-flow and high temperature reflux flue gas in time, fully mixes, fully realize bias combustion and improve stability, the reduction nitrogen oxide (NO that burns
X) discharge capacity, effectively avoid the wearing and tearing of oil gun and nozzle oral area ablated, prolong purposes such as its service life.
Solution of the present invention is to set up a center air duct that oil gun can be set along axis in main burner (wind, powder mixing nozzle), has not only avoided oil gun to bear the washing away of wind powder mixed airflow, but also can effectively prevent high temperature gases recirculating ablation jet hole when sufficient oxygen amount is provided for burning; In main burner, be provided with on the basis of venturi section, set up a venturi section in the annular channel between flow splitter and center air duct, further improve deep or light separating effect; Cancel the flameholder that background technology is provided with at this nozzle exit-side simultaneously, establish " L " type enlarging that protrudes in the secondary air nozzle and change at this nozzle exit-side, so that guaranteeing that the established coal powder density of upstream section is interior dense, the outer unlikely ruined while of light radial distribution feature, sneaking into of control secondary wind, can be regional thereby form a long and narrow weak turbulence, both reduced the ignition heat of breeze airflow, can postpone sneaking into of oxygen amount again, to reduce nitrogen oxide (NO
X) concentration of emission.Thereby present invention resides in the main burner (force one wind powder mixing nozzle) that is provided with venturi section (annular throat) and flow splitter in the nozzle, be arranged at outside this nozzle body with the main burner annular concentric, and be equipped with secondary and three grades of air nozzles of revolving (whirlpool) flow-generator in each runner, key is in main burner to have additional a center air duct that oil gun can be set along axis, the main burner runner is the annular channel that this center air duct and main burner inwall surround, and also be provided with venturi section at the air duct position, center corresponding to convex with main burner venturi section, flow splitter is then set up a venturi section in center air duct setting and the runner between this flow splitter and center air duct, also be provided with " L " type enlarging that protrudes in the secondary air nozzle at the main burner port of export; The center air duct is fixedlyed connected with the main burner cylindrical shell by support plate and is integral.
Sneak in the wind powder air-flow of main burner ejection for fear of center wind too early and improve current rate, to spout one section infundibulate beam tube is set in air duct venturi section front portion, center, beam tube inducer angle is that 5 °～15 ° horn mouth, outlet section is straight tube.Set venturi section comprises converging transition-flat segments-divergent segment or converging transition-divergent segment in described main burner runner and the center air duct, and wherein: the converging transition angle is that 5 °～30 °, divergent segment angle are 3 °～30 °.And set up a venturi section in the described runner between flow splitter and center air duct, the protuberance of this venturi section is located on the flow splitter inwall, 10 °～30 ° of its converging transition angles, divergent segment angle be 7 °～30 °, highly for this runner radial space 1/4～1/3.Be provided with the secondary air nozzle that revolves (whirlpool) flow-generator in the described runner, the vane type rotational flow generator that its rotational flow generator outer ring surface is a cone also is provided with an air inflow and regulates valve at secondary nozzle air inlet place.
The present invention is because of having set up the center air duct that oil gun can be set in main burner, set up the venturi section at the flow splitter inner flow passage, cancelled the flameholder that background technology is provided with at this jet hole simultaneously, it is interior dense effectively having improved burner main injection jet place coal powder density radial distribution, outer light effect, thereby has a coal powder light-dark good separating effect, two, three grades of air mass flows are than easy to adjust, deep or light side flow-rate ratio RQ is 0.9～1.0, deep or light side coal powder density than Rc greater than 4.5, flow resistance coefficient is little, spout place velocity flow profile ideal, strong with the supporting use of boiler to the adaptability of coal and load variations, combustion stability is good, nitrogen oxide emission is low, and can effectively avoid the wearing and tearing of oil gun and the generation of the ablated phenomenon of nozzle oral area, characteristics such as long service life.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Among the figure: 1. center air duct, 1～1. (center air duct) venturi section, 1～2. infundibulate beam tube, 2. main burner, 2～1. (main burner) venturi section, the enlarging of 2～2. " L " type, 3. flow splitter, 3～1. flow splitter venturi section, 4. secondary air nozzles, 4～1. secondary air rotational flow generators, 4～2. regulate valve, 4～3. valve adjustments bars, 4～4. rotational flow generator adjusting rods, 5. three grades of air nozzles, 5～1. three grades of air swirl generators, 5～2. horn mouths; F
1, center air duct air intlet, F
1. wind, powder combi inlet port, F
3, F
4: two, three grades of air intlets.
The specific embodiment
Burner length overall 3834mm, wherein: the long 2978mm of center air duct 1 main body, internal diameter φ 416mm, wall thickness 10mm, the converging transition angle of venturi section 1～1 is that 15 °, divergent segment angle are 12 °, flat segments internal diameter φ 283mm, long 300mm, and the bell mouth angle of anterior infundibulate beam tube 1～2 is 7 °, inside diameter of straight pipe section φ 337mm, both long 300mm that are; Main burner 2 long mm, large diameter φ 700mm, wall thickness 13mm, the converging transition of venturi section 2～1 and divergent segment angle also be respectively 15 ° and 12 °, flat segments internal diameter φ 568mm, longly also be 300mm, " L " type enlarging 2～2 internal diameter φ 768mm, axial long 120mm; Flow splitter 3 internal diameter φ 580mm, axially long 600mm, wall thickness 4mm, venturi section 3～1 long 276mm, converging transition angle are that 16 °, divergent segment angle are 11 °, flat segments internal diameter φ 283mm (being about 50mm) on it; 18 ° of the working cavity taperings of secondary air nozzle 4 outside diameter φ 1243mm, jet hole internal diameter φ 983mm, middle part rotational flow generator 4～1, the inner ring surface of rotational flow generator 4～1 and main burner 2 are slidingly matched and pass through its adjusting rod 4～4 axial adjustment, the adjusting valve 4～2 of secondary air porch adopts adjustable covering plate, to regulate the assignment of traffic of two, three grades of air; Three grades of air nozzle 5 long 1446mm, jet hole internal diameter φ 1307mm, horn mouth 5～2 angles are 25 °, axial long 321mm, its rotational flow generator 5～1 is located at three grades of air intake places, upper and lower symmetric arrangement two covers, the high 600mm of every cover (radially), (axially) wide 600mm.
Said burner main burner resistance adopts 25 and can satisfy 600MW boiler combustion requirement less than 350Pa.
Claims (5)
1. double cyclone pulverized coal burner, be included in the main burner that is provided with venturi section and flow splitter in the nozzle, be arranged at outside this nozzle body with the main burner annular concentric, and be equipped with secondary and three grades of air nozzles of rotational flow generator in each runner, it is characterized in that in main burner being provided with a center air duct that oil gun can be set along axis, the main burner runner is the annular channel that this center air duct and main burner inwall surround, and also be provided with venturi section at the air duct position, center corresponding to convex with main burner venturi section, flow splitter then is provided with a venturi section in center air duct setting and the runner between this flow splitter and center air duct, also be provided with " L " type enlarging that protrudes in the secondary air nozzle at the main burner port of export; The center air duct is fixedlyed connected with the main burner cylindrical shell by support plate and is integral.
2. by claim 1, described double cyclone pulverized coal burner; It is characterized in that to spout one section infundibulate beam tube being set in air duct venturi section front portion, center, beam tube inducer angle is that 5 °～15 ° horn mouth, outlet section is straight tube.
3. by claim 1, described double cyclone pulverized coal burner; It is characterized in that set venturi section comprises converging transition-flat segments-divergent segment or converging transition-divergent segment in described main burner runner and the center air duct, wherein: the converging transition angle is that 5 °～30 °, divergent segment angle are 3 °～30 °.
4. by claim 1, described double cyclone pulverized coal burner; It is characterized in that setting up in the runner between described flow splitter and the center air duct venturi section, the protuberance of this venturi section is located on the flow splitter inwall, 10 °～30 ° of its converging transition angles, divergent segment angle be 7 °～30 °, highly for this runner radial space 1/4～1/3.
5. by claim 1, described double cyclone pulverized coal burner; It is characterized in that being provided with in the described runner secondary air nozzle of rotational flow generator, the vane type rotational flow generator that its rotational flow generator outer ring surface is a cone also is provided with an air inflow and regulates valve at secondary nozzle air inlet place.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100509897A CN101216173B (en) | 2007-12-26 | 2007-12-26 | Double cyclone pulverized coal burner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100509897A CN101216173B (en) | 2007-12-26 | 2007-12-26 | Double cyclone pulverized coal burner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101216173A true CN101216173A (en) | 2008-07-09 |
| CN101216173B CN101216173B (en) | 2011-01-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007100509897A Active CN101216173B (en) | 2007-12-26 | 2007-12-26 | Double cyclone pulverized coal burner |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102287829A (en) * | 2011-09-24 | 2011-12-21 | 徐道芹 | Direct flow and swirl flow joint outlet-type burner |
| CN103100483A (en) * | 2013-02-05 | 2013-05-15 | 中国矿业大学(北京) | Fine stuff material separation and classifying device |
| CN103224816A (en) * | 2012-01-27 | 2013-07-31 | 通用电气公司 | System and method for heating a gasifier |
| CN103224815A (en) * | 2012-01-27 | 2013-07-31 | 通用电气公司 | System and method for heating a gasifier |
| CN104501136A (en) * | 2014-11-26 | 2015-04-08 | 广西大学 | Auxiliary combustion device |
| CN104949147A (en) * | 2014-03-31 | 2015-09-30 | 天津鼎熵节能科技有限公司 | Reinforcing burner |
| CN107620962A (en) * | 2017-08-23 | 2018-01-23 | 广东宝杰环保科技有限公司 | A kind of biogas low NO |
| CN108224416A (en) * | 2018-01-18 | 2018-06-29 | 王志远 | Burner |
| CN109207203A (en) * | 2017-06-30 | 2019-01-15 | 神华集团有限责任公司 | Gasification furnace and its feeding device, burner and solid fuel dispenser |
| CN109737393A (en) * | 2019-02-19 | 2019-05-10 | 沈阳环境科学研究院 | Big Pulverized Coal Concentration is than postponing hybrid vortex burner |
| CN111237751A (en) * | 2020-02-18 | 2020-06-05 | 上海电力大学 | A dense-thin separator for reducing nitrogen oxide discharges |
| CN111828960A (en) * | 2020-07-23 | 2020-10-27 | 郑州轻工业大学 | Adjustable coal powder burner with gradation |
| CN112066371A (en) * | 2020-09-02 | 2020-12-11 | 西安交通大学 | Hydrogen mixes low NOx burner in advance based on flame on duty |
| CN115949936A (en) * | 2022-11-01 | 2023-04-11 | 天津大学 | Water-spraying hydrogenation gas-solid phase two-phase burner for ultralow-nitrogen ammonia coal co-combustion |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4479442A (en) * | 1981-12-23 | 1984-10-30 | Riley Stoker Corporation | Venturi burner nozzle for pulverized coal |
| JPH07260106A (en) * | 1994-03-18 | 1995-10-13 | Hitachi Ltd | Pulverized coal firing burner and pulverized coal |
| JP3099109B2 (en) * | 1996-05-24 | 2000-10-16 | 株式会社日立製作所 | Pulverized coal burner |
| JP3344694B2 (en) * | 1997-07-24 | 2002-11-11 | 株式会社日立製作所 | Pulverized coal combustion burner |
| JP3924089B2 (en) * | 1999-04-28 | 2007-06-06 | 株式会社日立製作所 | Pulverized coal burner and combustion apparatus using pulverized coal burner |
| CN1920382B (en) * | 2006-09-04 | 2011-07-20 | 东方锅炉（集团）股份有限公司 | Rotational flow pulverized coal burner |
-
2007
- 2007-12-26 CN CN2007100509897A patent/CN101216173B/en active Active
Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102287829A (en) * | 2011-09-24 | 2011-12-21 | 徐道芹 | Direct flow and swirl flow joint outlet-type burner |
| CN103224816A (en) * | 2012-01-27 | 2013-07-31 | 通用电气公司 | System and method for heating a gasifier |
| CN103224815A (en) * | 2012-01-27 | 2013-07-31 | 通用电气公司 | System and method for heating a gasifier |
| CN103224815B (en) * | 2012-01-27 | 2017-05-24 | 通用电气公司 | System and method for heating a gasifier |
| CN103100483A (en) * | 2013-02-05 | 2013-05-15 | 中国矿业大学(北京) | Fine stuff material separation and classifying device |
| CN103100483B (en) * | 2013-02-05 | 2015-04-22 | 中国矿业大学(北京) | Fine stuff material separation and classifying device |
| CN104949147A (en) * | 2014-03-31 | 2015-09-30 | 天津鼎熵节能科技有限公司 | Reinforcing burner |
| CN104501136A (en) * | 2014-11-26 | 2015-04-08 | 广西大学 | Auxiliary combustion device |
| CN109207203B (en) * | 2017-06-30 | 2020-07-31 | 神华集团有限责任公司 | Gasification furnace and feeding device, burner and solid fuel distributor thereof |
| CN109207203A (en) * | 2017-06-30 | 2019-01-15 | 神华集团有限责任公司 | Gasification furnace and its feeding device, burner and solid fuel dispenser |
| CN107620962B (en) * | 2017-08-23 | 2018-08-31 | 广东宝杰环保科技有限公司 | A kind of biogas low NO |
| CN107620962A (en) * | 2017-08-23 | 2018-01-23 | 广东宝杰环保科技有限公司 | A kind of biogas low NO |
| CN108224416A (en) * | 2018-01-18 | 2018-06-29 | 王志远 | Burner |
| CN108224416B (en) * | 2018-01-18 | 2020-01-03 | 王志远 | Burner with a burner head |
| CN109737393A (en) * | 2019-02-19 | 2019-05-10 | 沈阳环境科学研究院 | Big Pulverized Coal Concentration is than postponing hybrid vortex burner |
| CN109737393B (en) * | 2019-02-19 | 2024-02-27 | 沈阳环境科学研究院 | Large coal powder concentration ratio postpone mixed type cyclone coal powder burner |
| CN111237751A (en) * | 2020-02-18 | 2020-06-05 | 上海电力大学 | A dense-thin separator for reducing nitrogen oxide discharges |
| CN111828960A (en) * | 2020-07-23 | 2020-10-27 | 郑州轻工业大学 | Adjustable coal powder burner with gradation |
| CN111828960B (en) * | 2020-07-23 | 2023-04-07 | 郑州轻工业大学 | Adjustable coal powder burner with gradation |
| CN112066371A (en) * | 2020-09-02 | 2020-12-11 | 西安交通大学 | Hydrogen mixes low NOx burner in advance based on flame on duty |
| CN115949936A (en) * | 2022-11-01 | 2023-04-11 | 天津大学 | Water-spraying hydrogenation gas-solid phase two-phase burner for ultralow-nitrogen ammonia coal co-combustion |
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| CN101216173B (en) | 2011-01-19 |
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Owner name: DONGFANG ELECTRIC GROUP DONGFANG BOILER GROUP CO., Free format text: FORMER NAME: DONGFANG BOILER (GROUP) CO., LTD. |
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Address after: 643000 Star Street Zigong city of Sichuan Province Huang Jue Ping No. 150 Patentee after: DEC Dongfang Boiler (Group) Co., Ltd. Address before: 643000 Zigong city of Sichuan Province Huang Jueping Wuxing Street Patentee before: Dongfang Boiler (Group) Co., Ltd. |