US20090000532A1 - Pulverized coal burner for firing fuel which is fed by dense phase conveyance - Google Patents

Pulverized coal burner for firing fuel which is fed by dense phase conveyance Download PDF

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Publication number
US20090000532A1
US20090000532A1 US12/144,236 US14423608A US2009000532A1 US 20090000532 A1 US20090000532 A1 US 20090000532A1 US 14423608 A US14423608 A US 14423608A US 2009000532 A1 US2009000532 A1 US 2009000532A1
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United States
Prior art keywords
burner
fuel
tube
primary air
air tube
Prior art date
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Abandoned
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US12/144,236
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English (en)
Inventor
Martin Ehmann
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Hitachi Power Europe GmbH
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Hitachi Power Europe GmbH
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Application filed by Hitachi Power Europe GmbH filed Critical Hitachi Power Europe GmbH
Assigned to HITACHI POWER EUROPE GMBH reassignment HITACHI POWER EUROPE GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: EHMANN, MARTIN
Publication of US20090000532A1 publication Critical patent/US20090000532A1/en
Abandoned legal-status Critical Current

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    • 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
    • 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
    • F23C6/045—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion in series connection with staged combustion in a single enclosure
    • 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
    • F23C7/004—Combustion apparatus characterised by arrangements for air supply the air being submitted to a rotary or spinning motion using vanes
    • F23C7/006—Combustion apparatus characterised by arrangements for air supply the air being submitted to a rotary or spinning motion using vanes adjustable

Definitions

  • the present invention is directed towards a burner, especially a pulverized coal burner, with a fuel conveying tube and a primary air tube which is concentrically arranged within it, wherein the primary air tube on the mouth discharge side terminates at a distance to the mouth opening of the fuel conveying tube, and the burner is connected, or can be connected, to a feed line which conveys pulverous fuel in dense phase.
  • the invention is directed towards a method for combustion of particulate fuel, especially pulverized coal, preferably dry brown coal, in a burner with primary air tube and fuel conveying tube, wherein the fuel is fed to the burner by dense phase conveyance and is conveyed by dense phase conveyance inside the burner along the longitudinal axis of the burner and mixed with combustion air.
  • burners which in addition to a core air feed have a primary air feed, a secondary air feed and a tertiary air feed.
  • Such burners are especially used in conjunction with the firing of furnaces of large steam generators.
  • the primary air feed, secondary air feed and tertiary air feed in this case are formed and arranged in the form of annular conveying cross sections, which are arranged concentrically to each other, or in the form of concentric arrangements coaxially around a central core air tube, in which an oil burner lance or suchlike can be arranged.
  • the pulverous fuel in this case as a rule is guided together with the primary combustion air (primary air) in a primary air tube inside the burner to the burner mouth.
  • Swirlers which are arranged on the outer side of the core jacket tube, are then provided in this primary air tube and impart a desired swirl to the pulverized coal/primary air mixture, so that as a result the combustion is optimized, but at least improved, especially with regard to a low-NO X combustion of the fuel.
  • These burners as a rule are used in plants in which the pulverous fuel is conveyed by means of a pneumatic conveyor from the mill directly to the burner. Attached to this is the disadvantage of being operated with low transporting gas loads and high conveying speeds in the process. This leads to an extensive wear of the transporting tubes. Furthermore, the conveying tubes have relatively large dimensions (conveying cross sections).
  • water vapour or a hot inert gas such as flue gas or nitrogen
  • a hot inert gas such as flue gas or nitrogen
  • burners are described in DE 197 15 973 A1, in which the fuel is fed to the burner in a central feed line, and then, during discharge from this central line, is mixed with primary and secondary air streams which issue from annular passage-form openings arranged concentrically around it, is dispersed, and distributed into the furnace in a suspended state.
  • Another burner has a central primary air tube which is concentrically encompassed by secondary and tertiary air lines. With this burner, the fuel is introduced into the burner in a pulverized coal pipe which is guided in a coiled manner around the primary air tube, and inside the burner is discharged into the secondary air passage at a distance from the mouth opening of the burner.
  • This known burner indeed already has the advantage that the combustion air streams, which are fed to the burner, and the fuel stream are spatially separated from each other so that a dense phase conveyance of the fuel is possible, wherein transporting gas loads of over 20 kg of pulverized coal/kg of transporting gas and conveying gas speeds of 3 to about 20 m/s at pressures of ⁇ 10 bar, are understood by dense phase conveyance in the present application, but the combustion is not yet optimized with regard to a low-NO X combustion.
  • the feed of the fuel is directly centred in the region of the extension of the longitudinal axis of the burner, so that the primary air stream which is arranged around it just has no enrichment by fuel particles in its radial outer region.
  • the fuel is indeed conveyed in a secondary air stream which in the radial direction is circumferentially arranged around the primary air stream.
  • a pulverized coal burner for the steam-oxygen gasification of pulverized coal which is introduced in dense phase is indeed already known from DD 251 476 A3, in which the fuel, which is uniformly distributed around a central feed of a combustion gas and of an oxidizing agent, via an annular passage cross section, is fed by dense phase conveyance.
  • the admixing of a steam-oxidizing agent mixture is only then carried out in the further, subsequent stream path outside a combustion chamber.
  • This burner serves for the gasification of the fuel and for producing a gasifying gas, which is why in addition to the oxidizing agent steam is also blown into the pulverized coal stream.
  • This technology cannot be used with a burner for the firing of a furnace of a steam generator.
  • the present invention relates to a low-NO X burner, which is suitable for firing the furnace of a steam generator, with a dense phase conveyance of fuel, without disadvantageously affecting the low-NO X combustion characteristic of the burner.
  • the inside space of the primary air tube is connected, or being connected, to a primary air feed line, and the fuel conveying space which is formed between the primary air tube and the fuel conveying tube being able to be connected, or being connected, to the feed line which feeds pulverous fuel in dense phase to the burner.
  • the fuel is conveyed inside the burner in an annular passage-form fuel conveying space which is formed radially outside a primary air line, and also by the primary air stream which issues from the primary air line being admixed in a swirled state with the fuel stream after discharge from the fuel conveying space inside the fuel conveying tube.
  • One of advantages of the present invention is that a solution is now created by which it is possible, without disadvantageously affecting the low-NO X combustion characteristic of the burner, to feed pulverous fuel to the burner by dense phase conveyance and to first mix the fuel with combustion air in the burner.
  • This is achieved by an annular passage being formed and provided, in which just before the mouth region on the discharge side of the burner to the furnace, the pulverous fuel, especially pulverized dry brown coal, is conveyed in the burner along the longitudinal axis of the burner.
  • This annular passage in this case is concentrically circumferentially arranged around the primary air stream.
  • the primary air stream is now furthermore swirled, for which swirlers are arranged and formed in the primary air stream at a suitable point, so that at the end of the annular passage-form conveying channel it mixes with the fuel which is conveyed by dense phase conveyance, so that consequently at the mouth end on the discharge side of the burner to the furnace the radially outer region of the primary air stream is circumferentially uniformly enriched with the fuel, or there is fuel exclusively in this region.
  • fuel is therefore conveyed by dense phase conveyance almost only in the outer circumferential region of the primary air stream. This does not disadvantageously affect the low-NO X combustion characteristics of the respective burner, on the contrary these are assisted, boosted and optimized as a result.
  • the swirlers which are provided for swirling the primary air stream are not arranged in the pulverized coal stream or coal mass stream, these are also not exposed to the abrasive wear of the fuel particles, so that the burner according to the invention is characterized as well by a reduced wear compared with the conveyance of fuel in the primary air mixture.
  • a core air tube is arranged concentrically to the primary air tube within it.
  • An oil burner lance or suchlike as this is known from customary burners, can then be arranged in the core air tube.
  • the conveyance of the particulate fuel, especially pulverous fuel is carried out in dense phase, large conveying cross sections, such as annular passage cross sections or pipeline cross sections, are not necessary for this conveyance, so that the invention is furthermore characterized in that the radial distance between core air tube and primary air tube is greater than the radial distance between primary air tube and fuel conveying tube.
  • the core air tube extends in the longitudinal axial direction beyond the mouth end on the discharge side of the primary air tube into the region of the mouth opening on the discharge side of the fuel conveying tube.
  • a mixing chamber in which the swirled primary air stream and the dense stream conveyed stream of fuel are mixed with each other, is formed inside the burner at the mouth end on the discharge side of the burner to the furnace.
  • the invention therefore, furthermore provides that a plurality of swirlers, preferably in the form of a vane ring, circumferentially distributed on the outer surface of the core air tube, are arranged radially on the outer side in the annular passage to the primary air tube.
  • the burner according to the invention is also equipped with an oil burner ignition lance, for which reason, according to a development of the invention, an ignition lance, especially an oil burner ignition lance, is arranged coaxially in the core air tube.
  • the invention ince with the configuration according to the invention especially low-NO X burners are to be provided, it is expedient if these additionally also have a secondary air feed and a tertiary air feed.
  • the invention is further characterized by a secondary air feed which encompasses the fuel conveying tube, and also a tertiary air feed which encompasses the secondary air feed.
  • the method according to the invention in an expedient development first of all provides that the primary air is admixed with the fuel stream in the mouth region of the burner in a mixing chamber before discharging into the furnace.
  • air, especially heated air, recirculated flue gas or a mixture of air and recirculated flue gas is fed to the burner as primary air.
  • FIGURE shows, in schematic view in detail and according to an exemplary embodiment of the present invention, a cross section along a longitudinal axis of an end on a combustion chamber side of a low-NO X burner which is arranged in the wall of a combustion chamber or of a furnace of a steam generator, especially of a large power plant.
  • the burner 1 on the discharge side, leads into the combustion chamber or into the furnace 2 of a steam generator and is arranged in its circumferential wall.
  • the burner 1 has an oil burner ignition lance 4 which is arranged centrally along its longitudinal axis 3 . This is arranged in the centre of a core air tube 5 which coaxially encompasses the oil burner ignition lance 4 .
  • the air guiding device 6 which is arranged around the oil burner ignition lance 4 at its end which faces the furnace 2 , ends flush with the mouth end on the burner discharge side of a fuel conveying tube 7 , in which primary air, which is fed to the burner through a primary air line 18 and mixed with particulate fuel which is fed through the fuel conveying tube 7 , discharges into the furnace 2 .
  • the fuel conveying tube 7 is concentrically arranged around the oil burner ignition lance 4 and also around the core air tube 5 , and with the outer generated surface of a primary air tube 9 , and, downstream of the end of the primary air tube towards the furnace 2 , with the outer generated surface of the core air tube 5 , forms in each case an annular passage-form conveying cross section.
  • an air deflecting throat 8 which extends over the whole circumference of the fuel conveying tube 7 , is formed on the outer side.
  • a stabilizing ring 14 which is provided with teeth, extends in this region radially inwards into the conveying cross section of the fuel conveying tube 7 and forms the termination of the fuel conveying tube 7 at this point.
  • the core air tube 5 terminates on the burner inner side at a distance to the mouth end on the combustion chamber discharge side of the fuel conveying tube 7 in the region of the air guiding device 6 .
  • the primary air tube 9 is arranged coaxially to the core air tube 5 and to the fuel conveying tube 7 so that a fuel conveying space 13 is formed with an annular passage-form conveying cross section.
  • the mouth end of the primary air tube 9 which faces the furnace 2 terminates at a distance from the mouth ends on the burner discharge side both of the core air tube 5 and of the fuel conveying tube 7 , so that on the burner inner side a mixing cross section or mixing chamber 10 is formed.
  • the end on the mouth side of the primary air tube 9 is located approximately in the region of the arrangement of swirlers 15 which in the case of low-NO X burners are customarily provided in the primary air stream.
  • the primary air tube 9 extends into the burner 1 to such an extent that its end on the mouth side is arranged in the positioning region of adjustable swirlers 11 , 12 which are located in a secondary air feed 19 and in a tertiary air feed 20 .
  • the primary air tube 9 furthermore, is arranged relative to the core air tube 5 and to the fuel conveying tube 7 in such a way that its radial distance to the core air tube 5 is greater than to the fuel conveying tube 7 . Therefore, the annular passage-form fuel conveying space 13 is formed between the outer side of the primary air tube 9 and the inner side of the fuel conveying tube 7 .
  • This annular fuel conveying space 13 is connected, or can be connected, to a feed line, which is not shown, by which fuel is pneumatically fed by dense phase conveyance to the burner 1 , and then is also pneumatically conveyed in the fuel conveying space 13 in dense phase.
  • the fuel is particulate fuel, especially pulverized coal, preferably pulverous dry brown coal.
  • the dense phase conveyance is carried out with a load of 20-90 kg of pulverized coal/kg of conveying gas, and a conveying speed of 3 to 20 m/s at pressures of ⁇ 10 bar.
  • the radial distance between the outer side of the primary air tube 9 and the inner side of the fuel conveying tube 7 , and consequently the passage height of the fuel conveying cross section or fuel conveying space 13 can be approximately as great as the length by which the teeth of the stabilizing ring 14 extend radially inwards in the direction of the burner axis 3 .
  • Primary air is fed to the burner 1 through the annular passage-form conveying cross section which is formed between the inner side of the primary air tube 9 and the outer side of the core air tube 5 .
  • the primary air can be air, especially preheated air, but can also be recirculated flue gas or a mixture of recirculated flue gas and air.
  • the primary air which is conveyed through the primary air line 18 with circular passage-form conveying cross section, when discharging is transferred into a swirled stream by means of adjustable swirlers 15 which are arranged on the inner side on the primary air tube 9 between core air tube 5 and primary air tube 9 at the end on the discharge side.
  • the swirlers 15 are formed in the form of a vane ring consisting of guide vanes which are arranged in a uniformly distributed manner on the outer circumference of the core air tube 5 .
  • the burner 1 has a secondary air tube 16 which is arranged on the outer side coaxially around the fuel conveying tube 7 , and a tertiary air tube 17 which in turn is arranged on the outer side coaxially at a distance around the secondary air tube. Secondary air is fed through the secondary air tube 16 to the furnace 2 , and tertiary air is fed through the tertiary air tube 17 to the furnace 2 , as this is known from known burners for creating a multistage low-NO X combustion.
  • the respective swirlers 15 , 11 and 12 which are arranged therein are formed with adjustment capability.
  • pulverized coal is pneumatically conveyed through the fuel conveying space 13 by dense phase conveyance inside the burner 1 along the burner axis 3 .
  • This fuel conveying space 13 is located radially outside the primary air line 18 through which primary air is conveyed and which is formed by the inside space of the primary air tube 9 and the outer generated surface of the core air tube 5 .
  • the supplied primary air is swirled in the discharge region of the primary air line 18 , or of the primary air conveying cross section, by means of swirlers 15 , and mixes with the dense stream of fuel which leaves the fuel conveying space 13 .
  • a mixing-through of the two components, which are primary air and fuel, is carried out, forming an enrichment of the radial outer region of the developing air stream with fuel, so that the coal material is conveyed into the region of the teeth of the stabilizing ring 14 and then discharges into the furnace 2 .
  • the primary air stream which is loaded with coal particles in this way leaves the burner 1 with a conveying speed of about 15-25 m/s, preferably 18-20 m/s.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion Of Fluid Fuel (AREA)
US12/144,236 2007-06-28 2008-06-23 Pulverized coal burner for firing fuel which is fed by dense phase conveyance Abandoned US20090000532A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007030269.1-13 2007-06-28
DE102007030269.1A DE102007030269B4 (de) 2007-06-28 2007-06-28 Kohlenstaubbrenner zur Verfeuerung von in Dichtstromförderung zugeführtem Brennstoff

Publications (1)

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US20090000532A1 true US20090000532A1 (en) 2009-01-01

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US12/144,236 Abandoned US20090000532A1 (en) 2007-06-28 2008-06-23 Pulverized coal burner for firing fuel which is fed by dense phase conveyance

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US (1) US20090000532A1 (de)
EP (1) EP2009351B1 (de)
JP (1) JP2009024991A (de)
CN (1) CN101334166A (de)
AT (1) ATE525615T1 (de)
AU (1) AU2008202470B2 (de)
CA (1) CA2632412A1 (de)
DE (1) DE102007030269B4 (de)
PL (1) PL2009351T3 (de)
RU (1) RU2008123264A (de)
SI (1) SI2009351T1 (de)
ZA (1) ZA200805541B (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080299506A1 (en) * 2007-05-29 2008-12-04 Bernhard Zimmermann Metallurgical Gas Burner
US20110230440A1 (en) * 2006-10-10 2011-09-22 Julian Adams Inhibitors of fatty acid amide hydrolase
US20110271885A1 (en) * 2010-05-04 2011-11-10 Hans Tim Chadwick Method and apparatus for improving combustion efficiency of carbonaceous fuel-fired furnaces by injecting oxyhydrogen gas
US20120103237A1 (en) * 2010-11-03 2012-05-03 Ronny Jones Tiltable multiple-staged coal burner in a horizontal arrangement
WO2013030533A2 (en) 2011-08-30 2013-03-07 Doosan Power Systems Limited Combustion apparatus
US9995480B2 (en) 2012-02-21 2018-06-12 Doosan Babcock Limited Burner
CN110566944A (zh) * 2019-09-09 2019-12-13 内蒙古工业大学 一种带有齿形稳燃装置的骨料烘干煤粉燃烧器及其控制方法
US11713427B2 (en) * 2017-04-14 2023-08-01 Changzheng Engineering Co., Ltd. Gasification burner

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DE102010030904B4 (de) 2010-07-02 2017-07-27 Mitsubishi Hitachi Power Systems Europe Gmbh Brenner mit Tangential-Spiral-Eintrittskrümmer
SI2369230T1 (sl) 2010-03-22 2015-12-31 Mitsubishi Hitachi Power Systems Europe Gmbh Gorilnik s tangencialnim spiralnim vstopnim kolenom
KR101065594B1 (ko) 2011-06-13 2011-09-19 한국기계연구원 질소산화물 저감용 공기 다단 연소기
CN102767824B (zh) * 2012-07-06 2015-08-05 南阳市沧田工程机械有限公司 一种新型高效煤粉燃烧装置
CN102878553B (zh) * 2012-09-17 2015-05-20 华中科技大学 一种低NOx防结渣的旋流煤粉燃烧器
CN103062764B (zh) * 2013-01-25 2015-11-18 福建永恒能源管理有限公司 一种低氮粉体燃料燃烧器
DE102013111504B4 (de) * 2013-10-18 2017-12-07 Mitsubishi Hitachi Power Systems Europe Gmbh Verfahren zur Zündung eines Kraftwerkbrenners und dafür geeigneter Kohlenstaubbrenner
CN103528059A (zh) * 2013-11-12 2014-01-22 哈尔滨前程科技发展有限公司 工业炉窑用多功能分步高氧燃烧器
US10126015B2 (en) 2014-12-19 2018-11-13 Carrier Corporation Inward fired pre-mix burners with carryover
CN106594711A (zh) * 2016-12-28 2017-04-26 浙江宜清环境技术有限公司 一种用于链条炉低氮燃烧装置
CN107726310A (zh) * 2017-11-22 2018-02-23 北京神雾电力科技有限公司 一种新型旋流煤粉燃烧器
DE102021002508A1 (de) * 2021-05-12 2022-11-17 Martin GmbH für Umwelt- und Energietechnik Düse zum Einblasen von Gas in eine Verbrennungsanlage mit einem Rohr und einem Drallerzeuger, Rauchgaszug mit einer derartigen Düse und Verfahren zur Verwendung einer derartigen Düse

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US144636A (en) * 1873-11-18 Improvement in writing-desks
US4704971A (en) * 1985-11-12 1987-11-10 Brennstoffinstitut Freiberg Pulverized-coal burner
US4776289A (en) * 1987-06-18 1988-10-11 Fuel Tech, Inc. Method and apparatus for burning pulverized solid fuel
US5832847A (en) * 1995-07-25 1998-11-10 Babcock Lentjes Kraftwerkstechnik Gmbh Method and apparatus for the reduction of nox generation during coal dust combustion
US6142765A (en) * 1995-09-07 2000-11-07 Vost-Alpine Industrieanlagenbau Gmbh Process for burning fuel
US5743723A (en) * 1995-09-15 1998-04-28 American Air Liquide, Inc. Oxy-fuel burner having coaxial fuel and oxidant outlets

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110230440A1 (en) * 2006-10-10 2011-09-22 Julian Adams Inhibitors of fatty acid amide hydrolase
US20080299506A1 (en) * 2007-05-29 2008-12-04 Bernhard Zimmermann Metallurgical Gas Burner
US20110271885A1 (en) * 2010-05-04 2011-11-10 Hans Tim Chadwick Method and apparatus for improving combustion efficiency of carbonaceous fuel-fired furnaces by injecting oxyhydrogen gas
US20120103237A1 (en) * 2010-11-03 2012-05-03 Ronny Jones Tiltable multiple-staged coal burner in a horizontal arrangement
WO2013030533A2 (en) 2011-08-30 2013-03-07 Doosan Power Systems Limited Combustion apparatus
US20140202365A1 (en) * 2011-08-30 2014-07-24 Doosan Babcock Limited Combustion apparatus with direct firing system
EP2751484B1 (de) * 2011-08-30 2017-11-29 Doosan Babcock Limited VERBRENNUNGSVORRICHTUNG MIT EINER INDIREKTEN Feuerung
US9995480B2 (en) 2012-02-21 2018-06-12 Doosan Babcock Limited Burner
US11713427B2 (en) * 2017-04-14 2023-08-01 Changzheng Engineering Co., Ltd. Gasification burner
CN110566944A (zh) * 2019-09-09 2019-12-13 内蒙古工业大学 一种带有齿形稳燃装置的骨料烘干煤粉燃烧器及其控制方法

Also Published As

Publication number Publication date
RU2008123264A (ru) 2009-12-27
JP2009024991A (ja) 2009-02-05
CA2632412A1 (en) 2008-12-28
SI2009351T1 (sl) 2012-01-31
EP2009351B1 (de) 2011-09-21
CN101334166A (zh) 2008-12-31
PL2009351T3 (pl) 2012-02-29
ZA200805541B (en) 2009-12-30
AU2008202470A1 (en) 2009-01-15
EP2009351A3 (de) 2009-11-04
DE102007030269A1 (de) 2009-01-02
EP2009351A2 (de) 2008-12-31
DE102007030269B4 (de) 2014-07-17
ATE525615T1 (de) 2011-10-15
AU2008202470B2 (en) 2010-10-28

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