EP1031790B1 - Verbesserungen an Flachflammenbrennern - Google Patents

Verbesserungen an Flachflammenbrennern Download PDF

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Publication number
EP1031790B1
EP1031790B1 EP00400320A EP00400320A EP1031790B1 EP 1031790 B1 EP1031790 B1 EP 1031790B1 EP 00400320 A EP00400320 A EP 00400320A EP 00400320 A EP00400320 A EP 00400320A EP 1031790 B1 EP1031790 B1 EP 1031790B1
Authority
EP
European Patent Office
Prior art keywords
burner
fuel
combustion
flame
injection rod
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.)
Expired - Lifetime
Application number
EP00400320A
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English (en)
French (fr)
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EP1031790A1 (de
Inventor
Patrick Giraud
Jean-Claude Montgermont
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.)
Fives Stein SA
Original Assignee
Stein Heurtey 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 Stein Heurtey SA filed Critical Stein Heurtey SA
Publication of EP1031790A1 publication Critical patent/EP1031790A1/de
Application granted granted Critical
Publication of EP1031790B1 publication Critical patent/EP1031790B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F23D14/20—Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone
    • F23D14/22—Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone with separate air and gas feed ducts, e.g. with ducts running parallel or crossing each other
    • 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 present invention relates to improvements made to a burner with flat flame intended in particular for the equipment of reheating furnaces, maintenance or heat treatment of steel products, burner of the kind of those which include at least one fuel injection pipe arranged according to the axis of the burner body and a supply of combustion air distributed in and by said body, the introduction of the fuel being effected by means of the injection pipes through one or more axial orifices located in a plane close to the external plan of the combustion tunnel.
  • FR-A-2 093 258 shows a burner of this kind in which the injection of gas takes place parallel to the axial direction at the periphery of the air injections of combustion and in the immediate vicinity thereof. This document does not envisage any provision to significantly reduce NOx production in the flame.
  • US-A-5,813,846 relates to a flat flame burner of a different type from that described above, since the fuel is introduced through orifices oriented radially and not by axial orifices.
  • the present invention relates to improvements made to a burner with flat flame in order to significantly lower its NOx production.
  • FIG. 1 therefore illustrates an exemplary embodiment of a furnace for reheating steel products with lower and upper heating.
  • Products to reheat designated by reference 1 are supported and transported to the interior of the oven by a system of fixed and mobile beams 2 and 3.
  • the movable beams are moved in a rectangular cycle movement thanks to the combined actions of a translational chassis 4 and a chassis of lifting 5, according to an arrangement well known to those skilled in the art.
  • the oven is produced in the form of an insulated enclosure 6 on which are arranged long flame burners 7 as well as flat flame burners 8 located on the roof of the oven.
  • the present invention relates to improvements made to flat flame burners 8.
  • Figures 2 and 3 illustrate two exemplary embodiments of arch burners according to the prior art.
  • FIG 2 there is shown schematically at 9, the combustion tunnel of a burner which has a flared opening whose shape is substantially quarter of circle so as to propagate the air stream and the burner flame following the profile of the combustion tunnel, by Coanda effect and along plane P of the vaulted.
  • the burner is supplied with combustion air, preheated or not, by a supply line 10 and this air is distributed in the burner body through orifices 11 drilled in the air distributor, which cause the setting in rotation the combustion air in order to obtain a helical circulation of this air around the fuel injection rod 12.
  • the latter is located in the axis of the burner in order to bring the fuel (s) into a suitable zone obtaining a good mixture with the combustion air.
  • the introduction of or fuels is produced through one or orifices 14 so as to obtain the flow shown diagrammatically by the arrow 15 in this figure 2.
  • a plate 13 is provided at the injection end of the rod 12, this plate 13 having the function of forcing the combustion air to come and settle on the wall internal combustion tunnel 9 to promote the formation of a flame flat and create a smoke suction vortex at the nose of the burner.
  • the arrow 16 shows schematically this vortex.
  • the combustion gases located in the oven enclosure are therefore recirculated to the burner nose by induction of the vortex 16 created by the high speed circulation of the air / gas mixture from the burner.
  • the flame from this air-gas mixture develops along 17, in according to the profile of the combustion tunnel 9 and the plane P of the roof of the furnace.
  • the arch burners can also be fitted with double fuel injection rods 18 and 19. having injection ports 20 and 14 respectively.
  • This known type of burner is similar in addition to the burner object of figure 2, the double cane injection allowing the use of two different types of fuel. injection single fuel through the orifices 20 can be implemented for example during the ignition phase of the burner, allowing better flame hooking at low fuel rates, especially when the oven enclosure temperature is below 750 ° C (no auto inflammation of the mixture).
  • FIG. 4 of the accompanying drawings there is shown a burner, according to the state prior art, designed to reduce the amount of NOx produced.
  • the fuel is injected very far from the tunnel combustion of the burner, in the vortex 16 of the combustion products.
  • the burner has a fuel injection rod located along its axis and which opens out in the combustion tunnel via a number of injectors radial 14.
  • the fuel is injected radially at high speed, at the through said injectors 14, into the combustion air, at the level of the tunnel in a area where the combustion air is diluted with gases from the oven environment.
  • This high speed fuel injection by a reduced number of radial injectors also performs a partition of the flame into several "small flames" of less intensive combustion and whose total volume is increased compared to a single flame.
  • the present invention proposes to lower the NOx level produced by flat flame burners, using the principle of dilution of the flame in order to reduce its temperature and lower the pressure partial oxygen in its reaction zone.
  • a flat flame burner intended in particular for the furnace of reheating, holding or thermal treatment of steel products, of the kind defined initially, is characterized in that the axial orifices have a large diameter so that the fuel pulse is weak enough not to disturb the recirculation vortex of the combustion products induced at the nose of the burner by the combustion air, in order to achieve a first dilution of the fuel in combustion products, and in that the fuel mixture plus combustion products thus obtained is entrained by the vortex then is diluted in the combustion air rotated around the fuel injection rod.
  • FIG. 5 is a schematic view in vertical axial section of an improved burner according to the invention.
  • the burner object of the invention uses the principle of diluting the flame in order to reduce its temperature and lower the partial pressure of oxygen in its reaction zone. This dilution of the flame is carried out with the combustion products located in the oven enclosure.
  • the originality of the present invention lies in the the fuel is introduced in two stages so as to obtain a double dilution: a first dilution of the fuel with the products of combustion of the oven then a second dilution of the fuel mixture plus products combustion thus obtained with combustion air.
  • FIG. 5 comprises a system double fuel supply.
  • the tunnel of combustion 9 the supply 10 of air, preheated or not, distributed in the body of the burner through the orifices 11, the dual fuel injection rod system 18 and 19, the injection taking place along the axis of the burner.
  • the fuel is introduced via a or of several axial orifices with which the introduction rods such as than 18 and 19 which allows fuel to be supplied with a weak pulse.
  • the fuel injection rod (s) 18 and 19 are made of materials resistant to high temperatures, in particular refractory materials, such as chromium or nickel steels or ceramics.
  • This dilution being favored by the positioning of the orifices 25 allowing the premixing of the fuel with the flue gases recirculated to the burner nose.
  • the axial fuel injection orifices 25 have a large diameter of so as to limit the fuel pulse to mix with the gases combustion. This weak impulse does not disturb the vortex of recirculation of the combustion products induced at the burner nose by the air from combustion, unlike the high-impulse radial injection which "Cuts" the vortex and disrupts this recirculation.
  • the fuel-combustion gas mixture thus obtained shown diagrammatically by the arrow 23 in Figure 5 is driven by the existing vortex at the nose of the burner then it is diluted with combustion air (arrow 24) itself diluted with a part of the combustion products (arrow 22) recirculated to the burner nose.
  • the burner object of the present invention makes it possible to achieve a double dilution of fuel and combustion products, combustion air and combustion products and finally achieve the mixture of the two diluted premixes.
  • This optimization of the “combustion air +” mixture fuel + combustion products ” provides a flat flame not intensive which limits emissions of pollutants in particular NOx, this reduction up to a ratio greater than 2, compared to a burner of the same type, according to the prior art.
  • the burner according to the present invention can keep the double fuel supply, with injections taking place at different levels in the combustion tunnel 9 in order to control the mixture of fuel (s), combustion air and combustion gases combustion recirculated to the burner nose.
  • the two injection rods of fuel can be used separately or simultaneously with a distribution of fuel flows between the two injections so as to control the shape of the flame, the quality of the premix and the emission of pollutants.
  • One of the injection pipes can be used to start the burner, for example when the oven temperature is below 700 ° C to obtain a better attachment of the flame, the other being able to be used in regime continuous to reduce the rate of pollutants produced.
  • the invention therefore makes it possible to solve the problem of reducing the rate of NOx produced by a flat flame burner ensuring combustion of the fuel in a large volume (mixture of combustion air, fuel, oven combustion products) which allows for a flame of lower temperature whose reaction zone has a reduction of partial pressure of oxygen.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gas Burners (AREA)
  • Pre-Mixing And Non-Premixing Gas Burner (AREA)
  • Manufacture, Treatment Of Glass Fibers (AREA)

Claims (6)

  1. Flachbrenner, welcher insbesondere zur Ausrüstung von Heiz-, Halte- oder Wärmebehandlungsöfen für eisenmetallurgische Erzeugnisse vorgesehen ist und mindestens ein in der Achse des Brennergehäuses angeordnetes Brennstoff-Injektionsrohr und eine Zuführung für Verbrennungsluft enthält, die in diesem und durch dieses Gehäuse verteilt wird, wobei der Eintritt des Brennstoffs (21) mittels des/ der Injektionsrohr/e (18, 19) durch eine oder mehrere axiale Öffnungen erfolgt, die sich in einer Ebene in der Nähe der äußeren Ebene (P) der Brennkammer (9) befinden,
    dadurch gekennzeichnet, dass der Eintritt des Brennstoffs ausschließlich durch die a-xiale(n) Öffnung(en) des oder der Brennstoff-Injektionsrohre(s) erfolgt, um die die Verbrennungsluft in Rotation versetzt wird,
    dass die axialen Öffnungen einen derart bedeutenden Durchmesser haben, dass der Impuls des Brennstoffes (21) hinreichend gering ist, um nicht den Wirbel der Rückführung der Verbrennungsprodukte zu stören, die der Mündung des Brenners zugeführt werden, um eine erste Verdünnung des Brennstoffs in diesen Verbrennungsprodukten durchzuführen,
    und dass das so erhaltene Gemisch (23) aus Brennstoff plus Verbrennungsprodukten durch den Wirbel angetrieben und dann in der in Rotation um das Brennstoff-Einspritzrohr versetzten Verbrennungsluft (24) verdünnt wird,
    wobei der Brenner die Verdünnung der Flamme mit den Verbrennungsprodukten dazu nutzt, die Flammtemperatur in seinem Reaktionsbereich zu verringern.
  2. Brenner nach Anspruch 1, dadurch gekennzeichnet, dass er mindestens ein Brennstoff-Injektionsrohr enthält, das mit einer oder mehreren axialen Eintrittsöffnungen für den Brennstoff versehen ist, die sich in unmittelbarer Nähe der Ausbreitungsebene der Flamme befinden, um eine Vormischung des Brennstoffs mit den Verbrennungsprodukten durchzuführen, die an die Brennermündung zurückströmen.
  3. Brenner nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass sein/e Injektionsrohr/e aus gegen hohe Temperaturen beständigen Materialien, insbesondere feuerfesten Materialien wie Chrom- bzw. Nickelstählen oder Keramik ausgeführt ist/sind.
  4. Brenner nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass er zwei Brennstoffeintritte enthält, die auf unterschiedlichen Höhen in der Brennkammer (9) angebracht sind, um die Mischung zwischen dem oder den Brennstoff/en, der Verbrennungsluft und den an die Mündung des besagten Brenners zurückgeführten Verbrennungsprodukten zu regeln.
  5. Brenner nach Anspruch 4, dadurch gekennzeichnet, dass die Brennstoffeinspritzungen getrennt eingesetzt werden oder gleichzeitig mit einer Verteilung der Brennstoffdurchsätze zwischen den zwei Einspritzungen, die derart ausgeführt wird, dass die Form der Flamme, die Qualität der Vormischung und die Schadstoffemission gesteuert werden.
  6. Brenner nach Anspruch 4, dadurch gekennzeichnet, dass eine der Einspritzungen für die Zündung des Brenners und die andere zur Verringerung der Grades an gebildeten Schadstoffen verwendbar ist.
EP00400320A 1999-02-25 2000-02-04 Verbesserungen an Flachflammenbrennern Expired - Lifetime EP1031790B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9902378 1999-02-25
FR9902378A FR2790309B1 (fr) 1999-02-25 1999-02-25 Perfectionnements apportes aux bruleurs a flamme plate

Publications (2)

Publication Number Publication Date
EP1031790A1 EP1031790A1 (de) 2000-08-30
EP1031790B1 true EP1031790B1 (de) 2004-10-13

Family

ID=9542546

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EP00400320A Expired - Lifetime EP1031790B1 (de) 1999-02-25 2000-02-04 Verbesserungen an Flachflammenbrennern

Country Status (9)

Country Link
US (1) US6461145B1 (de)
EP (1) EP1031790B1 (de)
JP (1) JP2000249312A (de)
CN (1) CN1139743C (de)
AT (1) ATE279688T1 (de)
CA (1) CA2299530C (de)
DE (2) DE1031790T1 (de)
ES (1) ES2153802T3 (de)
FR (1) FR2790309B1 (de)

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EP2458279B1 (de) * 2010-11-11 2017-06-07 VDEh-Betriebsforschungsinstitut GmbH Flachflammenbrenner
CN103562664B (zh) * 2011-05-31 2016-01-13 奥图泰有限公司 燃烧器装置和燃烧器组件
JP5774431B2 (ja) * 2011-09-28 2015-09-09 中外炉工業株式会社 壁面輻射式バーナーユニット
JP5878420B2 (ja) * 2012-04-19 2016-03-08 中外炉工業株式会社 壁面輻射式バーナー
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US20140157790A1 (en) * 2012-12-10 2014-06-12 Zilkha Biomass Power Llc Combustor assembly and methods of using same
CN103206708B (zh) * 2013-03-20 2018-05-11 洛阳腾节炉业科技有限公司 一种蓄热式烧嘴
ITMI20131093A1 (it) * 2013-06-28 2014-12-29 Tenova Spa "forno industriale e procedimento per controllare la combustione al suo interno"
JP6229424B2 (ja) * 2013-10-15 2017-11-15 株式会社デンソー 燃料噴射弁
FR3013803B1 (fr) * 2013-11-26 2019-05-17 Fives Stein Bruleur de four de rechauffement de produits siderurgiques ou de four de traitement thermique
KR101972247B1 (ko) * 2015-03-31 2019-04-24 미츠비시 히타치 파워 시스템즈 가부시키가이샤 연소 버너 및 보일러
RU2661993C1 (ru) 2015-03-31 2018-07-23 Мицубиси Хитачи Пауэр Системз, Лтд. Горелка для сжигания и котел, оснащенный такой горелкой для сжигания
JP6642912B2 (ja) 2015-09-11 2020-02-12 三菱日立パワーシステムズ株式会社 燃焼バーナ及びこれを備えたボイラ
EP3217094B2 (de) 2016-03-11 2023-06-28 Air Products And Chemicals, Inc. Brennervorrichtung und verbrennungsverfahren
CN115628450A (zh) * 2022-10-18 2023-01-20 南京年达炉业科技有限公司 一种燃气烧嘴、燃气加热系统及步进式铜锭燃气加热炉

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Also Published As

Publication number Publication date
FR2790309B1 (fr) 2001-05-11
US20020055078A1 (en) 2002-05-09
CA2299530C (fr) 2008-08-12
FR2790309A1 (fr) 2000-09-01
CA2299530A1 (fr) 2000-08-25
DE60014727T2 (de) 2005-11-03
ES2153802T3 (es) 2005-04-01
EP1031790A1 (de) 2000-08-30
CN1139743C (zh) 2004-02-25
US6461145B1 (en) 2002-10-08
DE1031790T1 (de) 2001-07-05
JP2000249312A (ja) 2000-09-12
DE60014727D1 (de) 2004-11-18
CN1265456A (zh) 2000-09-06
ES2153802T1 (es) 2001-03-16
ATE279688T1 (de) 2004-10-15

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