EP0430376A2 - Procédé de combustion pour combustible avec alimentation étagée du combustible et brûleur à cet effet - Google Patents

Procédé de combustion pour combustible avec alimentation étagée du combustible et brûleur à cet effet Download PDF

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Publication number
EP0430376A2
EP0430376A2 EP90203134A EP90203134A EP0430376A2 EP 0430376 A2 EP0430376 A2 EP 0430376A2 EP 90203134 A EP90203134 A EP 90203134A EP 90203134 A EP90203134 A EP 90203134A EP 0430376 A2 EP0430376 A2 EP 0430376A2
Authority
EP
European Patent Office
Prior art keywords
combustion
fuel
primary
zone
burner
Prior art date
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.)
Withdrawn
Application number
EP90203134A
Other languages
German (de)
English (en)
Other versions
EP0430376A3 (en
Inventor
Kevin James Knill
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
INTERNATIONAL FLAME RESEARCH FOUNDATION
Original Assignee
INTERNATIONAL FLAME RESEARCH FOUNDATION
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by INTERNATIONAL FLAME RESEARCH FOUNDATION filed Critical INTERNATIONAL FLAME RESEARCH FOUNDATION
Publication of EP0430376A2 publication Critical patent/EP0430376A2/fr
Publication of EP0430376A3 publication Critical patent/EP0430376A3/en
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • F23C6/047—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 with fuel supply in stages
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
    • F23C9/006—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber the recirculation taking place in the combustion chamber
    • 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 
    • F23C2201/00—Staged combustion
    • F23C2201/20—Burner staging
    • 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 
    • F23C2201/00—Staged combustion
    • F23C2201/30—Staged fuel supply
    • 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 
    • F23C2202/00—Fluegas recirculation
    • F23C2202/40—Inducing local whirls around flame

Definitions

  • the invention relates to a method for the combustion of fuel with a low NO x content in the combustion gases by means of stepped fuel feed.
  • Stepped fuel feed is a known type of operation which uses at least one burner of a type comprising a duct (hereinafter a quarl) widening out to a combustion chamber, near the throat of which two concentric annular ducts open out, through the inner of which a first part of the fuel (hereinafter primary fuel) is fed, and through the outer of which swirling combustion air is fed.
  • the primary fuel and the combustion air is allowed to combust in the combustion chamber in a primary combustion zone, whereby an internal recirculation zone (IRZ) is formed.
  • IRZ internal recirculation zone
  • a second part of the fuel (hereinafter secondary fuel) is fed to the combustion chamber near the primary combustion zone, and the secondary fuel is allowed to combust under substoichiometric conditions in a secondary combustion zone downstream from the primary combustion zone, whereby the NO x formed in the primary combustion zone is reduced, at least in part.
  • secondary combustion air is fed in near the secondary combustion zone, whereby the residual fuel is allowed to burn out in the product of combustion formed in the secondary combustion zone in a burn-out zone downstream from the secondary combustion zone.
  • the invention relates to a burner to be used with the method.
  • This type of burner is known in current practice as a 'swirl stabilized burner'.
  • a characteristic of such a burner is that during operation the internal recirculation zone is set up, in which the products of combustion of the primary combustion zone are recirculated.
  • Leikert and Rennart, with G. Buttner are named as inventors of GB-A-2146113, wherein there is disclosed the concentric introduction through annular ducts of, successively from the centre, primary fuel, primary air, secondary fuel and tertiary air.
  • the central void inside the innermost annulus i.e. inside the primary fuel duct
  • the central void inside the innermost annulus is in communication with a zone described as a return flow zone.
  • US-A-4265615 there is disclosed a can-type combustor divided by a restriction into a primary and secondary zone.
  • primary fuel is injected from an annular duct with annular air inlets both radially inside and outside it.
  • Secondary fuel is injected from a central duct, and is intended to pass through the primary zone to the secondary zone where it will be ignited by tertiary air fed into that zone. All the fuel flows and air flows through the burner are swirled and directed so as to maintain the primary and secondary fuels separate in the primary zone.
  • the burner construction and method of the invention is differentiated from GB-A-2146113 (which because of its constructional and operational similarities is regarded as the closest prior art) by the fact that the secondary fuel is fed through at least one duct concentric with or almost concentric with the two annuli, through which duct the secondary fuel is injected into the combustion chamber.
  • This has various advantages. There is no need for extra passages through the wall of the combustion chamber for feeding the secondary fuel.
  • the manner of feeding the secondary fuel makes for a particularly simple and compact design of the burner.
  • the secondary fuel may be fed at a lower speed at a distance from the wall of the combustion chamber. This means that less high temperature corrosion occurs in the steel pipes in that wall. Also it restricts deposition of thick slag on the wall of the combustion chamber more to its burner part than with the state of the art.
  • the secondary fuel is injected into the combustion chamber at such a speed that the fuel penetrates as a jet through the internal recirculation zone to the downstream end of the internal recirculation zone, and there mixes with the products of combustion of the primary combustion zone.
  • the secondary fuel is fed to the combustion chamber at a speed of at least 30 m/sec. This further optimises the method in accordance with the invention.
  • the secondary fuel is then preferably between 10 and 30% of the fuel and the stoichiometry in the secondary combustion zone is between 0.60 and 1.0, and more preferably between 0.70 and 0.90.
  • the invention is also embodied in a burner of a type comprising a quarl widening out to a combustion chamber and a pair of concentric annular ducts opening out near the throat of the quarl, the inner annulus being intended for feeding fuel, and the outer annulus being intended for feeding combustion air and being provided with means of setting the combustion air swirling.
  • a burner in current practice such a burner is known as a 'swirl stabilized burner'.
  • the burner is provided with at least one duct concentric with or almost concentric with the two annuli intended for feeding secondary fuel during operation.
  • Fig. 1 shows fuel staged burning for a prior art stove
  • Fig. 2 shows a prior art burner
  • Fig. 3 shows fuel staged burning embodying the invention
  • Fig. 4 shows results obtained from the invention.
  • Fig. 1 and Fig. 2 show fuel staged burning in accordance with the prior art, a burner 2 in the wall 3 of the stove. Primary fuel 4 and combustion air 5 are fed and combusted in a primary combustion zone 6. This combustion gives off NO x .
  • a secondary fuel 7 is fed and, after mixing in the products of combustion from the primary combustion zone, is combusted under substoichiometric conditioning in a secondary combustion zone reburn zone 8.
  • the products of combustion from the secondary combustion zone contain still combustible constituents. These are burned out in a burnout zone 10 by tertiary air 9.
  • the burner used with this known method is often a swirl stabilized burner, whereby (see Fig. 2) two concentric annular ducts (annuli) 13 and 14 for feeding the first part of the fuel (primary fuel) 4 and the combustion air 5 open out into the throat 12 of a quarl 11.
  • the combustion air is fed by swirling (not shown).
  • an internal recirculation 16 takes place in the primary combustion zone 6.
  • FIG. 3 An embodiment of the invention is shown in Fig. 3.
  • the secondary fuel 7 is fed through a duct 15 concentric with, or nearly so, and within the ducts 13 and 14.
  • This fuel is fed at such a speed that a jet penetrates the internal recirculation zone 16 and mixes, particularly at its downstream end 17, with the products of combustion from the primary combustion zone, whereupon combustion takes place in the secondary combustion zone 8.
  • the duct 15 may open out into the burner at any position in a range bordered by the throat 12 and by the inner wall 18 of the combustion chamber.
  • the invention may be used for all kinds of fuel such as pulverized coal, oil, residues and gas.
  • Fig. 4 shows a characteristic of the invention established on this basis.
  • the stoichiometry in the secondary combustion zone is preferably between 0.70 and 0.90.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
EP19900203134 1989-12-01 1990-11-27 Method for the combustion of fuel by stepped fuel feed and burner for use with it Withdrawn EP0430376A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8902963A NL8902963A (nl) 1989-12-01 1989-12-01 Werkwijze voor het verbranden van brandstof met een laag nox-gehalte in de verbrandingsgassen door middel van getrapte brandstoftoevoer en brander te gebruiken daarbij.
NL8902963 1989-12-01

Publications (2)

Publication Number Publication Date
EP0430376A2 true EP0430376A2 (fr) 1991-06-05
EP0430376A3 EP0430376A3 (en) 1992-01-15

Family

ID=19855728

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900203134 Withdrawn EP0430376A3 (en) 1989-12-01 1990-11-27 Method for the combustion of fuel by stepped fuel feed and burner for use with it

Country Status (4)

Country Link
EP (1) EP0430376A3 (fr)
JP (1) JPH03213901A (fr)
CA (1) CA2031228A1 (fr)
NL (1) NL8902963A (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0919768A1 (fr) * 1997-11-25 1999-06-02 Abb Research Ltd. Brûleur pour la mise en oeuvre d'un générateur de chaleur
DE19853162A1 (de) * 1998-11-18 2000-05-31 Steag Ag Verfahren zum Betreiben einer Verbrennungseinrichtung
EP1065461A1 (fr) * 1999-07-02 2001-01-03 L'air Liquide Société Anonyme pour l'étude et l'exploitation des procédés Georges Claude Prodédé de combustion, applicable à la fabrication de ciment.
EP1108951A1 (fr) * 1999-12-16 2001-06-20 Bloom Engineering Company, Inc. Brûleur à combustion étagée en air et combustible
US6461145B1 (en) * 1999-02-25 2002-10-08 Stein Heurtey Flat flame burners
US20050106520A1 (en) * 2003-09-05 2005-05-19 Michael Cornwell Device for stabilizing combustion in gas turbine engines
CN101233377B (zh) * 2005-08-03 2010-06-23 乔治洛德方法研究和开发液化空气有限公司 用于煅烧具有低NOx排放物的材料的方法
US20100227284A1 (en) * 2006-01-31 2010-09-09 Tenova S.P.A. Flat-flame vault burner with low polluting emissions
US10006630B2 (en) 2014-04-07 2018-06-26 Subcoal International B.V. Method for firing an industrial furnace using coal or cokes with a secondary fuel

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2050594A (en) * 1979-05-30 1981-01-07 United Technologies Corp Burner nozzle
US4265615A (en) * 1978-12-11 1981-05-05 United Technologies Corporation Fuel injection system for low emission burners
JPS5774506A (en) * 1980-10-27 1982-05-10 Kawasaki Heavy Ind Ltd Combustion of low nox in combustion chamber
EP0076036A1 (fr) * 1981-09-28 1983-04-06 John Zink Company Procédé et dispositif pour brûler du combustible en étapes
DE3206074A1 (de) * 1982-02-17 1983-08-18 Körting Hannover AG, 3000 Hannover Brenner fuer staubfoermige, gasfoermige und/oder fluessige brennstoffe
GB2146113A (en) * 1983-09-05 1985-04-11 Steinmueller Gmbh L & C Combustion of nitrogenous fuels
DE3446788A1 (de) * 1984-12-21 1986-07-03 L. & C. Steinmüller GmbH, 5270 Gummersbach Flammenverdampfungsbrenner mit vorbrennkammer
JPS63290306A (ja) * 1988-02-09 1988-11-28 Babcock Hitachi Kk 微粉炭燃焼装置の燃焼制御方法
EP0323299A1 (fr) * 1987-12-24 1989-07-05 Gaz De France (Service National) Appareil destiné à assurer la combustion étagée d'un mélange combustible-comburant diminuant la production d'oxydes d'azote

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5914142Y2 (ja) * 1978-08-08 1984-04-25 久夫 佐藤 掛具用ドライバ−

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4265615A (en) * 1978-12-11 1981-05-05 United Technologies Corporation Fuel injection system for low emission burners
GB2050594A (en) * 1979-05-30 1981-01-07 United Technologies Corp Burner nozzle
JPS5774506A (en) * 1980-10-27 1982-05-10 Kawasaki Heavy Ind Ltd Combustion of low nox in combustion chamber
EP0076036A1 (fr) * 1981-09-28 1983-04-06 John Zink Company Procédé et dispositif pour brûler du combustible en étapes
DE3206074A1 (de) * 1982-02-17 1983-08-18 Körting Hannover AG, 3000 Hannover Brenner fuer staubfoermige, gasfoermige und/oder fluessige brennstoffe
GB2146113A (en) * 1983-09-05 1985-04-11 Steinmueller Gmbh L & C Combustion of nitrogenous fuels
DE3446788A1 (de) * 1984-12-21 1986-07-03 L. & C. Steinmüller GmbH, 5270 Gummersbach Flammenverdampfungsbrenner mit vorbrennkammer
EP0323299A1 (fr) * 1987-12-24 1989-07-05 Gaz De France (Service National) Appareil destiné à assurer la combustion étagée d'un mélange combustible-comburant diminuant la production d'oxydes d'azote
JPS63290306A (ja) * 1988-02-09 1988-11-28 Babcock Hitachi Kk 微粉炭燃焼装置の燃焼制御方法

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 13, no. 100 (M-805)(3448) 9 March 1989 & JP-A-63 290 306 ( BABCOCK HITACHI ) 28 November 1988 *
PATENT ABSTRACTS OF JAPAN vol. 6, no. 157 (M-150)(1035) 18 August 1982 & JP-A-57 074 506 ( KAWASAKI JUKOGYO ) 10 May 1982 *

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5954490A (en) * 1997-11-25 1999-09-21 Abb Research Ltd. Burner for operating a heat generator
EP0919768A1 (fr) * 1997-11-25 1999-06-02 Abb Research Ltd. Brûleur pour la mise en oeuvre d'un générateur de chaleur
DE19853162A1 (de) * 1998-11-18 2000-05-31 Steag Ag Verfahren zum Betreiben einer Verbrennungseinrichtung
DE19853162C2 (de) * 1998-11-18 2003-04-30 Steag Encotec Gmbh Verfahren zum Verbrennen eines stickstoffhaltigen Brennstoffs
US6461145B1 (en) * 1999-02-25 2002-10-08 Stein Heurtey Flat flame burners
EP1065461A1 (fr) * 1999-07-02 2001-01-03 L'air Liquide Société Anonyme pour l'étude et l'exploitation des procédés Georges Claude Prodédé de combustion, applicable à la fabrication de ciment.
FR2795808A1 (fr) * 1999-07-02 2001-01-05 Air Liquide Procede de combustion, applicable a la fabrication de ciment
EP1108951A1 (fr) * 1999-12-16 2001-06-20 Bloom Engineering Company, Inc. Brûleur à combustion étagée en air et combustible
US6685463B2 (en) 1999-12-16 2004-02-03 Bloom Engineering Co., Inc. Air and fuel staged burner
US20050106520A1 (en) * 2003-09-05 2005-05-19 Michael Cornwell Device for stabilizing combustion in gas turbine engines
CN101233377B (zh) * 2005-08-03 2010-06-23 乔治洛德方法研究和开发液化空气有限公司 用于煅烧具有低NOx排放物的材料的方法
US20100227284A1 (en) * 2006-01-31 2010-09-09 Tenova S.P.A. Flat-flame vault burner with low polluting emissions
US8480394B2 (en) * 2006-01-31 2013-07-09 Tenova S.P.A. Flat-flame vault burner with low polluting emissions
US10006630B2 (en) 2014-04-07 2018-06-26 Subcoal International B.V. Method for firing an industrial furnace using coal or cokes with a secondary fuel

Also Published As

Publication number Publication date
EP0430376A3 (en) 1992-01-15
NL8902963A (nl) 1991-07-01
JPH03213901A (ja) 1991-09-19
CA2031228A1 (fr) 1991-06-02

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