EP0687854A1 - Brenner mit Abgasrückführung - Google Patents

Brenner mit Abgasrückführung Download PDF

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Publication number
EP0687854A1
EP0687854A1 EP95201537A EP95201537A EP0687854A1 EP 0687854 A1 EP0687854 A1 EP 0687854A1 EP 95201537 A EP95201537 A EP 95201537A EP 95201537 A EP95201537 A EP 95201537A EP 0687854 A1 EP0687854 A1 EP 0687854A1
Authority
EP
European Patent Office
Prior art keywords
exhaust gas
channel
burner
gas
premix
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Withdrawn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
EP95201537A
Other languages
English (en)
French (fr)
Inventor
Georges Le Strat
Michel Moser
Philip Vansteenkiste
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.)
Acotech NV SA
Original Assignee
Acotech NV SA
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 Acotech NV SA filed Critical Acotech NV SA
Priority to EP95201537A priority Critical patent/EP0687854A1/de
Publication of EP0687854A1 publication Critical patent/EP0687854A1/de
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/12—Radiant burners
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/72—Safety devices, e.g. operative in case of failure of gas supply
    • F23D14/78—Cooling burner parts

Definitions

  • the invention relates to a process and apparatus for burning gas/air mixtures loaded with recirculated exhaust gas from said burning process.
  • This object is achieved by a process of burning gas/air mixtures loaded with recirculated exhaust gas from said burning process wherein said mixture is passed as a premix, through a channel to the burner plate provided with passages for the mixture, and wherein a depression is created in said channel sufficient to suck and thereby recirculate a part of the exhaust gas generated at the burning surface and to distribute it throughout the mixture.
  • Said depression is preferably created by a venturi effect, in particular by partially deviating the flow of the premix at its periphery and in the neighbourhood of the entrance of the recirculated exhaust gas.
  • the gas/air mixture has an excess air ratio of not more than 30 %, preferably not more than 20 % and even between 5 % and 15 %.
  • the recirculated exhaust gas can be cooled down during its passage to channel. This cooling down can be reached by injecting fresh air in the recirculating exhaust gas during its passage to the channel.
  • the invention relates also to a burner for carrying out the processes described above. It comprises means for composing the gas/air premix and for advancing said premix through said channel to said burner plate, means for creating the depression and housing means extending concentrically around said channel, enclosing thereby a recirculation space having an inlet at the burner periphery and an outlet in the channel for recirculating the exhaust gas.
  • the channel will preferably be in the form of a venturi tube terminating with its diverging section against the burner plate and whereby the housing extends at least around said diverging section and having a ringlike outlet in the throat area of the venturi tube, the throat area being provided with a radially inwardly projecting edge just upstream of said ringlike outlet.
  • the cross section surface of the venturi in the throat area is preferably 2 to 3 times the surface area of the ringlike outlet for the exhaust gas.
  • the burner plate may be in the form of a wire net or a perforated plate. Preferably it will comprise a porous consolidated web of high temperature resistant metal fibers as known from WO 93/18342.
  • the burner 1 for carrying out the processes described above and illustrated in the drawing comprises an inlet 18 for the gas and an inlet 14 for the air in a mixing area 2 where the premix is composed.
  • the transversely and tangentially inflowing gas 18 and the axially inflowing air 14 allow the generation of a homogeneous, combustible mixture.
  • This gas/air premix is advanced through the converging section of a channel 3 in the form of a venturi tube terminating with its diverging section 4 against the burner plate 5.
  • a housing 6 extends concentrically at least around said diverging section and encloses thereby a recirculation space 7 around said channel 3.
  • Space 7 has a ringlike inlet 8 at the periphery of the burner plate 5 and a ringlike outlet 9 in the throat area 10 of the venturi tube.
  • the throat area 10 is provided with a radially inwardly projecting edge 11 just upstream of said ringlike outlet 9 for creating the desired depression in the channel to suck the recirculated gas in it.
  • the venturi tube may be of a conventional design whereby the throat area has a cylindrical shape wherein the diameter d equals the axial length of the cilinder and wherein the diverging angle ⁇ of the wall of section 4 is between 7° and 15°.
  • the converging section upstream the throat has an axial length of 2.7(D - d) wherein D is the diameter of the cilindrical mixing area 2 and d is the diameter of the throat 10.
  • the angle of convergence ⁇ is about 21°.
  • the cross section surface of the venturi in the throat area ( ⁇ d2/4) is preferably 2 to 3 times the surface area of the ringlike outlet 9 for the exhaust gas. This allows an entering velocity of the exhaust gas in the channel 3 which is sufficient to realise a homogeneous mixture with the premix.
  • the shape and dimensions of the recirculation space 7 and in particular of its entrance 8 and exit 9 are designed to assure a proper pressure drop in the gas stream between the throat area 10 and the burning area 13 in view of avoiding any flash back or back firing during operation. It has been observed that for an effective recirculation the upper edge 19 of the housing has to extend a certain distance "s" above the burning surface of the plate 5. This will be further discussed in the example. In view of allowing a complete combustion the minimum distance "a" between the burning plate surface and the surface to be heated will be choosen somewhat larger than the length of the flame tongues when the burner operates at its maximum output. The distance s will generally not depend on "a”.
  • space 7 will also be determined by the degree of direct or indirect cooling of the exhaust gas during recirculation in space 7.
  • the indirect cooling can be achieved by baffle means 15 separating the heating area 13 from the outside of housing 6 and channel 3 and/or by means 15 arranged around the wall of housing 6 to promote the dissipation of heat from recirculating gas in space 7.
  • a porous metal fiber web 15 can be used for heat dissipation. Cooling of the wall 6 can of course be enhanced by other means such as circulating a cooling fluid around the housing 6.
  • Direct cooling can be realized by injecting a cooling gas through ducts 16 in the space 7. If this cooling gas is fresh air, it can help to adjust the proportion gas / air in the premix and the pressure drop in the burner. Cooling may also be important in view of avoiding flash back at the entree face of the burner plate 5.
  • the burner plate 5 may be in the form of a wire net or a perforated plate. Preferably it will comprise a porous consolidated web 17 of high temperature resistant metal fibers as known from WO 93/18342.
  • a burner was designed as shown in the drawing with a burning surface of 176,7 cm2 but without cooling means 15, 16 for the housing 6.
  • the ringlike outlet 9 had a width of 6 mm and the edge 11 had a radially inwardly projecting dimension "e" of 4 mm.
  • This construction created a satisfactory depression in the channel 3 just upstream of the edge 11 to suck in the recirculated exhaust gas from the space 7.
  • the burner plate was a perforated sintered metal fiber web sold by Applicant under the designation AC 200 P2.
  • the distance "s" was changed from 0 mm to 65 mm as defined in the table below.
  • the natural gas was tapped from the French gas distribution network and hence it contains a certain proportion of the gas source of Lacq and of the source of Groningen.
  • Different combustion regimes MW/m2 were tested with different excess air ratios (%) and compared with an experiment without recirculation of exhaust gases.
  • the temperature T (°C) was measured at spot 21 and the depression ⁇ P at spot 22.
  • the NO x -values (ppm) were determined and adjusted to their stoechiometric proportions.
  • the burning process and the burner design according to the invention are therefore not limited to a channel 3 in the form of a venturi tube.
  • the premix could be advanced through a cylindrical channel 3, provided that proper means 11 are arranged to create the desired depression for the recirculation of exhaust gas. It is further possible to insert a wire net just downstream of the burner plate in view of further reducing the NO x -values. It is also possible to insert a filter just upstream of the burner plate.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gas Burners (AREA)
EP95201537A 1994-06-13 1995-06-12 Brenner mit Abgasrückführung Withdrawn EP0687854A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP95201537A EP0687854A1 (de) 1994-06-13 1995-06-12 Brenner mit Abgasrückführung

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP94201707 1994-06-13
EP94201707 1994-06-13
EP95201537A EP0687854A1 (de) 1994-06-13 1995-06-12 Brenner mit Abgasrückführung

Publications (1)

Publication Number Publication Date
EP0687854A1 true EP0687854A1 (de) 1995-12-20

Family

ID=26136335

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95201537A Withdrawn EP0687854A1 (de) 1994-06-13 1995-06-12 Brenner mit Abgasrückführung

Country Status (1)

Country Link
EP (1) EP0687854A1 (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999061839A1 (en) * 1998-05-25 1999-12-02 Wedab Wave Energy Development Ab A boiler arrangement and a method of burning oil
EP1217297A1 (de) * 2000-12-22 2002-06-26 ALSTOM Power N.V. Brenner mit hoher Flammenstabilität
EP1840459A1 (de) * 2006-03-31 2007-10-03 Truma Gerätetechnik GmbH & Co. KG Brennersystem mit Kalte-Flamme-Prozess
US7363756B2 (en) 2002-12-11 2008-04-29 Alstom Technology Ltd Method for combustion of a fuel
CZ301955B6 (cs) * 2005-03-14 2010-08-11 Arcelormittal Ostrava A.S. Zpusob chlazení teles horáku, ohrívací pec nebo podobné zarízení s horákem tímto zpusobem chlazeným, a zpusob rízení takové ohrívací pece nebo podobného zarízení
CN104832923A (zh) * 2015-05-29 2015-08-12 潘汉祥 一种炉嘴燃烧装置
CN108506935A (zh) * 2018-05-28 2018-09-07 杭州浙大天元科技有限公司 基于燃气内循环的低NOx燃气燃烧器及降低排放的方法
CN110864294A (zh) * 2019-10-31 2020-03-06 杭州中景科技有限公司 非对称烧嘴
DE102021100007A1 (de) 2021-01-04 2022-07-07 Vaillant Gmbh Brenneranordnung für einen Vormischbrenner

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55107811A (en) * 1979-02-14 1980-08-19 Daido Steel Co Ltd Radiant tube heating device
DE3201366A1 (de) * 1982-01-19 1983-07-28 Peter 7300 Esslingen Witkowski Waermebehandlungsofen
US4405587A (en) * 1982-02-16 1983-09-20 Mcgill Incorporated Process for reduction of oxides of nitrogen
EP0157432A2 (de) 1984-03-05 1985-10-09 Shell Internationale Researchmaatschappij B.V. Brenner zur Strahlungsoberflächenverbrennung
DE3639974A1 (de) * 1986-11-22 1988-05-26 Stiebel Eltron Gmbh & Co Kg Brennerlanze
DE8812089U1 (de) * 1987-09-21 1988-11-03 Joh. Vaillant Gmbh U. Co, 5630 Remscheid Vorrichtung zur Speisung eines Gasbrenners mit einem Brenngas und Verbrennungsluft enthaltenden Gemisch
DE9003576U1 (de) * 1989-04-11 1990-06-07 Kinetics Technology International Group B.V., Zoetermeer Strahlungswandbrenner
EP0374423A2 (de) * 1988-12-20 1990-06-27 John Zink Gmbh Atmosphärischer Brenner
WO1992008927A1 (en) * 1990-11-19 1992-05-29 Exxon Chemical Patents Inc. Flue gas recirculation for nox reduction in premix burners
WO1993018342A1 (en) 1992-03-03 1993-09-16 N.V. Bekaert S.A. Porous metal fiber plate

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55107811A (en) * 1979-02-14 1980-08-19 Daido Steel Co Ltd Radiant tube heating device
DE3201366A1 (de) * 1982-01-19 1983-07-28 Peter 7300 Esslingen Witkowski Waermebehandlungsofen
US4405587A (en) * 1982-02-16 1983-09-20 Mcgill Incorporated Process for reduction of oxides of nitrogen
EP0157432A2 (de) 1984-03-05 1985-10-09 Shell Internationale Researchmaatschappij B.V. Brenner zur Strahlungsoberflächenverbrennung
DE3639974A1 (de) * 1986-11-22 1988-05-26 Stiebel Eltron Gmbh & Co Kg Brennerlanze
DE8812089U1 (de) * 1987-09-21 1988-11-03 Joh. Vaillant Gmbh U. Co, 5630 Remscheid Vorrichtung zur Speisung eines Gasbrenners mit einem Brenngas und Verbrennungsluft enthaltenden Gemisch
EP0374423A2 (de) * 1988-12-20 1990-06-27 John Zink Gmbh Atmosphärischer Brenner
DE9003576U1 (de) * 1989-04-11 1990-06-07 Kinetics Technology International Group B.V., Zoetermeer Strahlungswandbrenner
WO1992008927A1 (en) * 1990-11-19 1992-05-29 Exxon Chemical Patents Inc. Flue gas recirculation for nox reduction in premix burners
WO1993018342A1 (en) 1992-03-03 1993-09-16 N.V. Bekaert S.A. Porous metal fiber plate

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 004, no. 158 (M - 039) 5 November 1980 (1980-11-05) *

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999061839A1 (en) * 1998-05-25 1999-12-02 Wedab Wave Energy Development Ab A boiler arrangement and a method of burning oil
EP1217297A1 (de) * 2000-12-22 2002-06-26 ALSTOM Power N.V. Brenner mit hoher Flammenstabilität
US6640545B2 (en) 2000-12-22 2003-11-04 Alstom Ltd. Burner with high flame stability
DE10064259B4 (de) * 2000-12-22 2012-02-02 Alstom Technology Ltd. Brenner mit hoher Flammenstabilität
US7363756B2 (en) 2002-12-11 2008-04-29 Alstom Technology Ltd Method for combustion of a fuel
CZ301955B6 (cs) * 2005-03-14 2010-08-11 Arcelormittal Ostrava A.S. Zpusob chlazení teles horáku, ohrívací pec nebo podobné zarízení s horákem tímto zpusobem chlazeným, a zpusob rízení takové ohrívací pece nebo podobného zarízení
EP1840459A1 (de) * 2006-03-31 2007-10-03 Truma Gerätetechnik GmbH & Co. KG Brennersystem mit Kalte-Flamme-Prozess
CN104832923A (zh) * 2015-05-29 2015-08-12 潘汉祥 一种炉嘴燃烧装置
CN108506935A (zh) * 2018-05-28 2018-09-07 杭州浙大天元科技有限公司 基于燃气内循环的低NOx燃气燃烧器及降低排放的方法
CN108506935B (zh) * 2018-05-28 2024-08-30 杭州浙大天元科技有限公司 基于燃气内循环的低NOx燃气燃烧器及降低排放的方法
CN110864294A (zh) * 2019-10-31 2020-03-06 杭州中景科技有限公司 非对称烧嘴
DE102021100007A1 (de) 2021-01-04 2022-07-07 Vaillant Gmbh Brenneranordnung für einen Vormischbrenner

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