EP0348646B1 - Burner - Google Patents

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Publication number
EP0348646B1
EP0348646B1 EP89108576A EP89108576A EP0348646B1 EP 0348646 B1 EP0348646 B1 EP 0348646B1 EP 89108576 A EP89108576 A EP 89108576A EP 89108576 A EP89108576 A EP 89108576A EP 0348646 B1 EP0348646 B1 EP 0348646B1
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EP
European Patent Office
Prior art keywords
combustion chamber
guide screen
air duct
air
duct pipe
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
EP89108576A
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German (de)
French (fr)
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EP0348646A3 (en
EP0348646A2 (en
Inventor
Rolf Oppenberg
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.)
Deutsche Babcock Werke Energie und Umwelttechnik AG
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Deutsche Babcock Werke Energie und Umwelttechnik AG
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Priority to AT89108576T priority Critical patent/ATE101911T1/en
Publication of EP0348646A2 publication Critical patent/EP0348646A2/en
Publication of EP0348646A3 publication Critical patent/EP0348646A3/en
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Publication of EP0348646B1 publication Critical patent/EP0348646B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D17/00—Burners for combustion conjointly or alternatively of gaseous or liquid or pulverulent fuel
    • F23D17/002—Burners for combustion conjointly or alternatively of gaseous or liquid or pulverulent fuel gaseous or liquid 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 
    • 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

Definitions

  • the invention relates to a combustion chamber with a burner for burning gaseous and / or liquid fuels with the features of the preamble of claim 1.
  • Such a burner is used for the NO x combustion of fuels.
  • a known burner (DE-OS 33 27 597) the suppression of the formation of nitrogen oxides is achieved in that the combustion air is given in stages and that the combustion air produces an injector effect, through which largely burnt-out smoke gases are sucked out of the combustion chamber. These flue gases are fed to the beginning of the flame between the primary air and the secondary air supply. Since the known burner is used to heat large combustion chambers, the air guide tube and the flue gas return duct are laid in the burner channel located outside the combustion chamber to protect against the heat load from the combustion chamber.
  • the invention has for its object to design the generic firebox in such a way that an effective suppression of nitrogen oxide formation is achieved even in confined spaces.
  • the baffle in the combustion chamber according to the invention effects flow guidance of the expanding combustion air / flue gas mixture.
  • the cone shape of the paraglider creates a slim flame and the deflection of the flame towards the center of the combustion chamber prevents the flame from striking back into the suction area. Therefore, only burned-out flue gas enters the return suction area.
  • the constriction of the flame is further reinforced by kinking the inner edge of the guide screen. Characterized in that, in an embodiment of the invention, a part of the gas lances protrudes into the suckback area, the injector effect which causes the suckback is increased by the escaping gas flow. On the other hand, it is achieved that the fuel gas is diluted by the flue gas and thus quasi reduced in calorific value, which also contributes to a reduction in nitrogen oxide formation.
  • Figures 1 to 3 show in cross section a fire chamber with a burner in various embodiments.
  • the flame tube 1 is surrounded by a water jacket 2 and closed by an end wall 3.
  • a burner is flanged to the end wall 3 and comprises an air guide tube 4 and burner lances which protrude through the end wall 3 into the combustion chamber 5 delimited by the flame tube 1.
  • the air guide tube 4 serves for the supply of primary air and is surrounded by a secondary air supply which is formed by connecting pipes 6 (FIG. 1) or nozzle pipes 7 (FIGS. 2, 3).
  • the air duct 4 and the secondary air supply are connected to a supply pipe 8 which is flanged to the end wall 3 on the side facing away from the combustion chamber 5.
  • This feed pipe 8 has a first section 9, which is connected to an air line 10.
  • the diameter of this first section 9 is somewhat larger than the diameter of the air guide tube 4.
  • the first section 9 is followed by a second section 11 of enlarged cross section, the diameter of which is larger than the pitch circle on which the Supply of secondary air connecting tubes 6 and nozzle tubes 7 are arranged.
  • the burner lances consist of an oil lance 12 and gas lances 13, 14.
  • the oil lance 12 is preferably designed as a return atomizer with an oil inlet 15 and an oil return 16 and is arranged centrally within the air guide tube 4.
  • the oil lance 12 is surrounded by an impeller 17 which, like the outlet opening of the oil lance 12, is arranged inside the air guide tube 4.
  • the gas lances 13, 14 are arranged partly inside the air guide tube 4 around the oil lance 12 and partly on a pitch circle outside the air guide tube 4.
  • the gas lances 13, 14 are connected to a collecting duct 18, which is fed via a gas line 19.
  • the collecting duct 18 surrounds the first section 9 of the feed pipe 8 and adjoins the second section 11 as an extension. This results in a space-saving design outside the flame tube boiler.
  • the number and cross-section of the gas lances 13, 14 is chosen so that the larger proportion, e.g. 80% of the supplied fuel gas is supplied to the outer gas lances 14 surrounding the air guide tube 4.
  • the air guide tube 4 is surrounded by a baffle 20 within the combustion chamber 5.
  • the guide screen 20 is arranged at an axial distance from the end wall 3 of the combustion chamber 5 and is supported on the air guide tube 4.
  • the guide screen 20 tapers in the direction of the longitudinal axis of the combustion chamber 5, its smallest diameter being larger than the diameter of the air guide tube 4.
  • the front edge 21 of the guide screen 20 is bent towards the longitudinal axis of the combustion chamber 5.
  • the guide screen 20 projects in the direction of the combustion chamber 5 beyond the outlet opening of the air guide tube 4.
  • the oil lance 12 is arranged such that the fuel cone 22 leaving the outlet opening of the oil lance 12 does not just hit the guide screen 20.
  • the baffle 20 is made of a heat-resistant metallic or ceramic material. 1, the baffle 20 is double-walled formed and has a cavity 23 open on one side towards the combustion chamber 5. The cavity 23 is enlarged towards the end wall 3 to form a collecting space 24 and closed by a bottom 25. The cavity 23 is connected by the connecting pipes 6 to the enlarged portion 11 of the feed pipe 8, so that secondary air flows through it. The secondary air also serves to cool the guide screen 20 and then enters the combustion chamber 5 in the direction of flow behind the primary air as combustion air.
  • the conical shape of the guide screen 20 deflects the flame in the direction of the longitudinal axis of the combustion chamber 5.
  • the primary air flowing through the air guide tube 4 and the guide screen 20 generates an injector effect within the guide screen 20, through which burnt-out flue gas is sucked out of the combustion chamber 5.
  • the flue gas through the annular space 27 serving as a flue gas return duct between the air guide tube 4 and the guide screen 20 the beginning of the flame between the primary air task (through the air guide pipe 4) and the secondary air task (through the cavity 23) fed.
  • the outer gas lances 14 protrude into the annular space 27.
  • the fuel gas emerging from the gas lances 14 mixes with the recirculated flue gas, as a result of which the specific calorific value is reduced, which favors the suppression of nitrogen oxide formation.
  • the injector effect is increased, which effect can be influenced by an axial adjustment of the gas lances 14.
  • the burners shown in FIGS. 2 and 3 differ from the burner according to FIG. 1 in that the outer, preferably axially adjustable gas lances 14 protrude into the combustion chamber 5 only by an amount which is less than the axial distance of the guide screen 20 from the end wall 3. Furthermore, the secondary air supply is formed by the nozzle tubes 7, the outlet openings of which are less far in the combustion chamber 5 than the outlet openings of the outer gas lances 14. The diameter of the partial circles on which the nozzle tubes 7 and the outer gas lances 14 are arranged is larger than the diameter of the air guide tube 4 and smaller than the largest diameter of the guide screen 20th
  • the guide screen 20 is provided with a cavity 28 which is open on both sides.
  • the inlet cross section of this cavity 28 lies in the extension of the axes of the nozzle tubes 7 and the outer gas lances 14.
  • the guide screen 20 consists of a simple sheet metal jacket, the interior enclosed by this sheet metal jacket in the extension of the axes of the nozzle tubes 7 and the outer gas lances 14.
  • the sheet metal jacket of the guide screen 20 is cooled by being blown with secondary air.
  • the operation of the guide screens 20 shown in FIGS. 2 and 3 is the same as that of the guide screen 20 of the burner according to FIG. 1.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacture, Treatment Of Glass Fibers (AREA)

Abstract

A burner for burning gaseous and/or liquid fuels in a combustion space (5), through the face (3) of which an oil lance (12) and/or several gas lances (13 and 14) extend. The oil lance and at least some of the gas lances are surrounded by an air pipe (4) that supplies primary air with its outer surface demarcating a flue-gas recirculation channel that opens toward the combustion space and surrounded by a source of secondary air. The air pipe and the source of secondary air extend into the combustion space. The air pipe is surrounded inside the combustion space by a baffle (20) that is axially separated from the face of the combustion space. Some of the gas lances surround the air pipe and are mounted on a sector with a diameter that is shorter than the longest diameter of the baffle.

Description

Die Erfindung betrifft einen Feuerraum mit einem Brenner zum Verbrennen von gasförmigen und/oder flüssigen Brennstoffen mit den Merkmalen des Oberbegriffes des Anspruches 1.The invention relates to a combustion chamber with a burner for burning gaseous and / or liquid fuels with the features of the preamble of claim 1.

Ein solcher Brenner dient der NOx-armen Verbrennung von Brennstoffen. Bei einem bekannten Brenner (DE-OS 33 27 597) wird die Unterdrückung der Bildung von Stickoxiden dadurch erreicht, daß die Verbrennungsluft gestuft aufgegeben wird und daß durch die Verbrennungsluft eine Injektorwirkung erzeugt wird, durch die weitgehend ausgebrannte Rauchgase aus dem Feuerraum angesaugt werden. Diese Rauchgase werden dem Flammenanfang zwischen der Primärluft- und der Sekundärluftaufgabe zugeführt. Da der bekannte Brenner der Beheizung von großen Feuerräumen dient, sind zum Schutz gegen die Wärmebelastung aus dem Feuerraum das Luftleitrohr und der Rauchgasrückführkanal in die sich außerhalb des Feuerraumes befindliche Brennerkehle verlegt.Such a burner is used for the NO x combustion of fuels. In a known burner (DE-OS 33 27 597) the suppression of the formation of nitrogen oxides is achieved in that the combustion air is given in stages and that the combustion air produces an injector effect, through which largely burnt-out smoke gases are sucked out of the combustion chamber. These flue gases are fed to the beginning of the flame between the primary air and the secondary air supply. Since the known burner is used to heat large combustion chambers, the air guide tube and the flue gas return duct are laid in the burner channel located outside the combustion chamber to protect against the heat load from the combustion chamber.

In engen Feuerräumen, wie sie durch das Flammrohr eines durch einen Brenner beheizten Flammrohrkessels gebildet sind, zeigen die den Brenner verlassenden Medienströme eine Kolbenströmung. Aus einer solchen Strömung lösen sich Teilströmungen ab, die noch nicht vollständig ausgebranntes Rauchgas enthalten. Es würde daher bei einem Einsatz eines gemäß der DE-OS 33 27 597 gestalteten Brenners für Flammrohrkessel dem Flammenanfang nicht vollständig ausgebranntes Rauchgas zugeführt. Auf diese Weise würde die angestrebte Wirkung einer weitgehenden Unterdrückung der Stickoxidbildung nicht vollständig erreicht.In narrow combustion chambers, such as those formed by the flame tube of a flame tube boiler heated by a burner, the media flows leaving the burner show a piston flow. Partial flows that contain flue gas that has not yet completely burned out separate from such a flow. If a burner for flame tube boilers designed according to DE-OS 33 27 597 were used, the flue gas which was not completely burned out would be supplied to the beginning of the flame. In this way, the desired effect of largely suppressing nitrogen oxide formation would not be fully achieved.

Der Erfindung liegt die Aufgabe zugrunde, den gattungsgemäßen Feuerraum derart zu gestalten, daß auch bei beengten Raumverhältnissen eine wirksame Unterdrückung der Stickoxidbildung erreicht wird.The invention has for its object to design the generic firebox in such a way that an effective suppression of nitrogen oxide formation is achieved even in confined spaces.

Diese Aufgabe wird bei einem gattungsgemäßen Feuerraum erfindungsgemäß durch die kennzeichnenden Merkmale des Anspruches 1 gelöst. Vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen angegeben.This object is achieved in a generic firebox according to the invention by the characterizing features of claim 1. Advantageous embodiments of the invention are specified in the subclaims.

Der Leitschirm in dem erfindungsgemäßen Feuerraum bewirkt eine Strömungsführung des expandierenden Verbrennungsluft-Rauchgas-Gemisches. Dabei wird durch die Kegelform des Leitschirmes eine schlanke Flamme erzeugt und durch die Ablenkung der Flamme zur Mitte des Feuerraumes verhindert, daß die Flamme in den Rücksaugebereich zurückschlägt. In den Rücksaugebereich tritt daher nur ausgebranntes Rauchgas hinein. Die Einschnürung der Flamme wird durch ein Abknicken der innenliegenden Kante des Leitschirmes weiter verstärkt. Dadurch, daß in Ausgestaltung der Erfindung ein Teil der Gaslanzen in den Rücksaugebereich hineinragt, wird einerseits durch den austretenden Gasstrom die die Rücksaugung bewirkende Injektorwirkung erhöht. Andererseits wird erreicht, daß das Brenngas durch das Rauchgas verdünnt und damit quasi im Heizwert verringert wird, was ebenfalls zu einer Verminderung der Stickoxidbildung beiträgt.The baffle in the combustion chamber according to the invention effects flow guidance of the expanding combustion air / flue gas mixture. The cone shape of the paraglider creates a slim flame and the deflection of the flame towards the center of the combustion chamber prevents the flame from striking back into the suction area. Therefore, only burned-out flue gas enters the return suction area. The constriction of the flame is further reinforced by kinking the inner edge of the guide screen. Characterized in that, in an embodiment of the invention, a part of the gas lances protrudes into the suckback area, the injector effect which causes the suckback is increased by the escaping gas flow. On the other hand, it is achieved that the fuel gas is diluted by the flue gas and thus quasi reduced in calorific value, which also contributes to a reduction in nitrogen oxide formation.

Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und werden im folgenden näher erläutert. Die Figuren 1 bis 3 zeigen im Querschnitt einen Feuerraummit einem Brenner in verschiedenen Ausführungsformen.Embodiments of the invention are shown in the drawing and are explained in more detail below. Figures 1 to 3 show in cross section a fire chamber with a burner in various embodiments.

Von einem Flammrohrkessel ist nur der brennerseitige Teil des Flammrohres 1 dargestellt. Das Flammrohr 1 ist von einem Wassermantel 2 umgeben und durch eine Stirnwand 3 geschlossen. An die Stirnwand 3 ist ein Brenner angeflanscht, der ein Luftleitrohr 4 und Brennerlanzen umfaßt, die durch die Stirnwand 3 in den von dem Flammrohr 1 umgrenzten Feuerraum 5 hineinragen.Of a flame tube boiler, only the part of the flame tube 1 on the burner side is shown. The flame tube 1 is surrounded by a water jacket 2 and closed by an end wall 3. A burner is flanged to the end wall 3 and comprises an air guide tube 4 and burner lances which protrude through the end wall 3 into the combustion chamber 5 delimited by the flame tube 1.

Das Luftleitrohr 4 dient der Zuführung von Primärluft und ist von einer Sekundärluftzuführung umgeben, die durch Verbindungsrohre 6 (Fig. 1) oder Düsenrohre 7 (Fig. 2, 3) gebildet ist. Das Luftleitrohr 4 und die Sekundärluftzuführung sind an ein Zuführungsrohr 8 angeschlossen, das auf der dem Feuerraum 5 abgewandten Seite an die Stirnwand 3 angeflanscht ist. Dieses Zuführungsrohr 8 weist einen ersten Abschnitt 9 auf, der mit einer Luftleitung 10 verbunden ist. Der Durchmesser dieses ersten Abschnittes 9 ist etwas größer als der Durchmesser des Luftleitrohres 4. Zur Stirnwand 3 hin schließt sich an den ersten Abschnitt 9 ein zweiter Abschnitt 11 von vergrößertem Querschnitt an, dessen Durchmesser größer ist als der Teilkreis, auf dem die der Zuführung von Sekundärluft dienenden Verbindungsrohre 6 und Düsenrohre 7 angeordnet sind.The air guide tube 4 serves for the supply of primary air and is surrounded by a secondary air supply which is formed by connecting pipes 6 (FIG. 1) or nozzle pipes 7 (FIGS. 2, 3). The air duct 4 and the secondary air supply are connected to a supply pipe 8 which is flanged to the end wall 3 on the side facing away from the combustion chamber 5. This feed pipe 8 has a first section 9, which is connected to an air line 10. The diameter of this first section 9 is somewhat larger than the diameter of the air guide tube 4. Towards the end wall 3, the first section 9 is followed by a second section 11 of enlarged cross section, the diameter of which is larger than the pitch circle on which the Supply of secondary air connecting tubes 6 and nozzle tubes 7 are arranged.

Die Brennerlanzen bestehen aus einer Öllanze 12 und aus Gaslanzen 13, 14. Die Öllanze 12 ist vorzugsweise als Rücklaufzerstäuber mit einem Ölzulauf 15 und einem Ölrücklauf 16 ausgebildet und zentral innerhalb des Luftleitrohres 4 angeordnet. Die Öllanze 12 ist von einem Impeller 17 umgeben, der ebenso wie die Austrittsöffnung der Öllanze 12 innerhalb des Luftleitrohres 4 angeordnet ist.The burner lances consist of an oil lance 12 and gas lances 13, 14. The oil lance 12 is preferably designed as a return atomizer with an oil inlet 15 and an oil return 16 and is arranged centrally within the air guide tube 4. The oil lance 12 is surrounded by an impeller 17 which, like the outlet opening of the oil lance 12, is arranged inside the air guide tube 4.

Die Gaslanzen 13, 14 sind zu einem Teil innerhalb des Luftleitrohres 4 rings um die Öllanze 12 und zum anderen Teil auf einem Teilkreis außerhalb des Luftleitrohres 4 angeordnet. Die Gaslanzen 13, 14 sind an einen Sammelkanal 18 angeschlossen, der über eine Gasleitung 19 gespeist wird. Der Sammelkanal 18 umgibt den ersten Abschnitt 9 des Zuführungsrohres 8 und schließt sich als Verlängerung an dessen zweiten Abschnitt 11 an. Auf diese Weise ergibt sich eine raumsparende Gestaltung außerhalb des Flammrohrkessels. Die Anzahl und der Querschnitt der Gaslanzen 13, 14 ist so gewählt, daß der größere Anteil, z.B. 80 %, des zugeführten Brenngases den äußeren, das Luftleitrohr 4 umgebenden Gaslanzen 14 zugeführt wird.The gas lances 13, 14 are arranged partly inside the air guide tube 4 around the oil lance 12 and partly on a pitch circle outside the air guide tube 4. The gas lances 13, 14 are connected to a collecting duct 18, which is fed via a gas line 19. The collecting duct 18 surrounds the first section 9 of the feed pipe 8 and adjoins the second section 11 as an extension. This results in a space-saving design outside the flame tube boiler. The number and cross-section of the gas lances 13, 14 is chosen so that the larger proportion, e.g. 80% of the supplied fuel gas is supplied to the outer gas lances 14 surrounding the air guide tube 4.

Das Luftleitrohr 4 ist innerhalb des Feuerraumes 5 von einem Leitschirm 20 umgeben. Der Leitschirm 20 ist in einem axialen Abstand von der Stirnwand 3 des Feuerraumes 5 angeordnet und auf dem Luftleitrohr 4 abgestützt. Der Leitschirm 20 läuft in Richtung auf die Längsachse des Feuerraumes 5 konisch zu, wobei sein geringster Durchmesser größer ist als der Durchmesser des Luftleitrohres 4. Die vordere Kante 21 des Leitschirmes 20 ist zur Längsachse des Feuerraumes 5 hin abgeknickt. Der Leitschirm 20 ragt in Richtung auf den Feuerraum 5 über die Austrittsöffnung des Luftleitrohres 4 hinaus. Dabei ist die Öllanze 12 so angeordnet, daß der die Austrittsöffnung der Öllanze 12 verlassende Brennstoffkegel 22 gerade nicht auf den Leitschirm 20 trifft.The air guide tube 4 is surrounded by a baffle 20 within the combustion chamber 5. The guide screen 20 is arranged at an axial distance from the end wall 3 of the combustion chamber 5 and is supported on the air guide tube 4. The guide screen 20 tapers in the direction of the longitudinal axis of the combustion chamber 5, its smallest diameter being larger than the diameter of the air guide tube 4. The front edge 21 of the guide screen 20 is bent towards the longitudinal axis of the combustion chamber 5. The guide screen 20 projects in the direction of the combustion chamber 5 beyond the outlet opening of the air guide tube 4. Here, the oil lance 12 is arranged such that the fuel cone 22 leaving the outlet opening of the oil lance 12 does not just hit the guide screen 20.

Der Leitschirm 20 ist aus einem warmfesten metallischen oder keramischen Werkstoff gefertigt. Nach Fig. 1 ist der Leitschirm 20 doppelwandig ausgebildet und weist einen einseitig zum Feuerraum 5 hin offenen Hohlraum 23 auf. Der Hohlraum 23 ist zur Stirnwand 3 hin zur Bildung eines Sammelraumes 24 vergrößert und durch einen Boden 25 geschlossen. Der Hohlraum 23 ist durch die Verbindungsrohre 6 mit dem vergrößerten Abschnitt 11 des Zuführungsrohres 8 verbunden, so daß er von Sekundärluft durchströmt ist. Die Sekundärluft dient zusätzlich der Kühlung des Leitschirmes 20 und tritt anschließend in Strömungsrichtung hinter der Primärluft als Verbrennungsluft in den Feuerraum 5 ein.The baffle 20 is made of a heat-resistant metallic or ceramic material. 1, the baffle 20 is double-walled formed and has a cavity 23 open on one side towards the combustion chamber 5. The cavity 23 is enlarged towards the end wall 3 to form a collecting space 24 and closed by a bottom 25. The cavity 23 is connected by the connecting pipes 6 to the enlarged portion 11 of the feed pipe 8, so that secondary air flows through it. The secondary air also serves to cool the guide screen 20 and then enters the combustion chamber 5 in the direction of flow behind the primary air as combustion air.

Die konische Form des Leitschirmes 20 bewirkt eine Ablenkung der Flamme in Richtung auf die Längsachse des Feuerraumes 5. Die durch das Luftleitrohr 4 und den Leitschirm 20 strömende Primärluft erzeugt innerhalb des Leitschirmes 20 eine Injektorwirkung, durch die ausgebranntes Rauchgas aus dem Feuerraum 5 angesaugt wird. Wie durch die Pfeile 26 in Fig. 1 angedeutet ist, wird das Rauchgas durch den als Rauchgasrückführkanal dienenden Ringraum 27 zwischen dem Luftleitrohr 4 und dem Leitschirm 20 dem Flammenanfang zwischen der Primärluftaufgabe (durch das Luftleitrohr 4) und der Sekundärluftaufgabe (durch den Hohlraum 23) zugeführt. In den Ringraum 27 ragen die äußeren Gaslanzen 14 hinein. Das aus den Gaslanzen 14 austretende Brenngas vermischt sich mit dem rückgeführten Rauchgas, wodurch der spezifische Heizwert vermindert wird, was die Unterdrückung der Stickoxidbildung begünstigt. Gleichzeitig wird die Injektorwirkung verstärkt, wobei diese Wirkung durch ein axiales Verstellen der Gaslanzen 14 beeinflußt werden kann.The conical shape of the guide screen 20 deflects the flame in the direction of the longitudinal axis of the combustion chamber 5. The primary air flowing through the air guide tube 4 and the guide screen 20 generates an injector effect within the guide screen 20, through which burnt-out flue gas is sucked out of the combustion chamber 5. As indicated by the arrows 26 in Fig. 1, the flue gas through the annular space 27 serving as a flue gas return duct between the air guide tube 4 and the guide screen 20, the beginning of the flame between the primary air task (through the air guide pipe 4) and the secondary air task (through the cavity 23) fed. The outer gas lances 14 protrude into the annular space 27. The fuel gas emerging from the gas lances 14 mixes with the recirculated flue gas, as a result of which the specific calorific value is reduced, which favors the suppression of nitrogen oxide formation. At the same time, the injector effect is increased, which effect can be influenced by an axial adjustment of the gas lances 14.

Die in den Fig. 2 und 3 dargestellten Brenner unterscheiden sich von dem Brenner gemäß Fig. 1 dadurch, daß die äußeren, vorzugsweise axial verstellbaren Gaslanzen 14 nur um einen Betrag in den Feuerraum 5 hineinragen, der geringer ist als der axiale Abstand des Leitschirmes 20 von der Stirnwand 3. Weiterhin ist die Sekundärluftzuführung durch die Düsenrohre 7 gebildet, deren Austrittsöffnungen weniger weit im Feuerraum 5 liegen als die Austrittsöffnungen der äußeren Gaslanzen 14. Der Durchmesser der Teilkreise, auf denen die Düsenrohre 7 und die äußeren Gaslanzen 14 angeordnet sind, ist größer als der Durchmesser des Luftleitrohres 4 und kleiner als der größte Durchmesser des Leitschirmes 20.The burners shown in FIGS. 2 and 3 differ from the burner according to FIG. 1 in that the outer, preferably axially adjustable gas lances 14 protrude into the combustion chamber 5 only by an amount which is less than the axial distance of the guide screen 20 from the end wall 3. Furthermore, the secondary air supply is formed by the nozzle tubes 7, the outlet openings of which are less far in the combustion chamber 5 than the outlet openings of the outer gas lances 14. The diameter of the partial circles on which the nozzle tubes 7 and the outer gas lances 14 are arranged is larger than the diameter of the air guide tube 4 and smaller than the largest diameter of the guide screen 20th

Gemäß Fig. 2 ist der Leitschirm 20 mit einem beidseitig offenen Hohlraum 28 versehen. Dabei liegt der Eintrittsquerschnitt dieses Hohlraumes 28 in der Verlängerung der Achsen der Düsenrohre 7 und der äußeren Gaslanzen 14. Gemäß Fig. 3 besteht der Leitschirm 20 aus einem einfachen Blechmantel, wobei der von diesem Blechmantel umschlossene Innenraum in der Verlängerung der Achsen der Düsenrohre 7 und der äußeren Gaslanzen 14 liegt. Bei dieser Ausführungsform wird der Blechmantel des Leitschirmes 20 durch ein Anblasen mit Sekundärluft gekühlt. Die Wirkungsweise der in den Fig. 2 und 3 dargestellten Leitschirme 20 ist die gleiche wie die des Leitschirmes 20 des Brenners gemäß Fig. 1.2, the guide screen 20 is provided with a cavity 28 which is open on both sides. The inlet cross section of this cavity 28 lies in the extension of the axes of the nozzle tubes 7 and the outer gas lances 14. According to FIG. 3, the guide screen 20 consists of a simple sheet metal jacket, the interior enclosed by this sheet metal jacket in the extension of the axes of the nozzle tubes 7 and the outer gas lances 14. In this embodiment, the sheet metal jacket of the guide screen 20 is cooled by being blown with secondary air. The operation of the guide screens 20 shown in FIGS. 2 and 3 is the same as that of the guide screen 20 of the burner according to FIG. 1.

Claims (10)

  1. Combustion chamber with a burner for combustion of gaseous and/or liquid fuels, in which an oil lance (12) and/or several gas lances (13, 14) are led through the end wall (3) of the combustion chamber (5) and the oil lance (12) and at least a part of the gas lances (13, 14) are surrounded by an air duct pipe (4), which serves for the feed of primary air, the outer circumference of which bounds a flue gas return feed channel open towards the combustion chamber and which is surrounded by a secondary air feed, characterised thereby that the air duct pipe (4) and the secondary air feed project into the combustion chamber (5), that the air duct pipe (4) is surrounded within the combustion chamber (5) by a guide screen (20), which is arranged at an axial spacing from the end wall (3) of the combustion chamber (5), and that a part of the gas lances (14) surrounds the air guide pipe (4) and is arranged on a pitch circle of which the diameter is smaller than the largest diameter of the guide screen (20).
  2. Combustion chamber according to claim 1, characterised thereby that the guide screen (20) conically narrows towards the interior of the combustion chamber (5).
  3. Combustion chamber according to claim 1 or 2, characterised thereby that the gas lances (14) surrounding the air duct pipe (4) project into the combustion chamber (5) by an amount which is smaller than the axial spacing of the guide screen (20) from the end wall (3) of the combustion chamber (5).
  4. Combustion chamber according to one of claims 1 to 3, characterised thereby that the secondary air feed consists of nozzle tubes (7), which project into the combustion chamber (5) by an amount which is smaller than the axial spacing of the guide screen (20) from the end wall (3) of the combustion chamber (5), and that the nozzle tubes (7) are arranged on a pitch circle of which the diameter is smaller than the largest diameter of the guide screen (20).
  5. Combustion chamber according to one of claims 1 to 4, characterised thereby that the guide screen (20) consists of a plain sheet metal casing and that the intermediate space between the air duct pipe (4) and the guide screen (20) is arranged in the prolongation of the axes of the nozzle tubes (7) and the gas lances (14) surrounding the air duct pipe (4).
  6. Combustion chamber according to one of claims 1 to 4, characterised thereby that the guide screen (20) is double-walled and has a hollow space (28) open at both ends and that the inlet cross-section of the hollow space (28) is arranged in the prolongation of the axes of the nozzle tubes (7) and the gas lances (14) surrounding the air duct pipe (4).
  7. Combustion chamber according to one of claims 1 or 2, characterised thereby that the guide screen (20) is double-walled and has a hollow space (23), which is open at one end towards the combustion chamber (5) and which is connected to the secondary air feed by way of connecting tubes (6).
  8. Combustion chamber according to claim 7, characterised thereby that the gas lances (14) surrounding the air duct pipe (4) project into the annular space (27) between the air duct pipe (4) and the guide screen (20).
  9. Combustion chamber according to one of claims 1 to 8, characterised thereby that the edge (21), which faces into the combustion chamber (5), of the guide screen (20) is bent over inwardly.
  10. Combustion chamber according to one of claims 1 to 9, characterised thereby that the air duct pipe (4) is connected outside the combustion chamber (5) with a feed pipe (8), that the feed pipe (8) has a portion (11) of enlarged cross-section at the end facing the end wall (3) of the combustion chamber and that in prolongation of this portion (11) the feed pipe (8) is surrounded by an annular collector channel (18) supplying the gas lances (13, 14).
EP89108576A 1988-06-30 1989-05-12 Burner Expired - Lifetime EP0348646B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89108576T ATE101911T1 (en) 1988-06-30 1989-05-12 BURNER.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3822004A DE3822004A1 (en) 1988-06-30 1988-06-30 BURNER
DE3822004 1988-06-30

Publications (3)

Publication Number Publication Date
EP0348646A2 EP0348646A2 (en) 1990-01-03
EP0348646A3 EP0348646A3 (en) 1991-07-03
EP0348646B1 true EP0348646B1 (en) 1994-02-23

Family

ID=6357568

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89108576A Expired - Lifetime EP0348646B1 (en) 1988-06-30 1989-05-12 Burner

Country Status (5)

Country Link
US (1) US4979894A (en)
EP (1) EP0348646B1 (en)
JP (1) JPH0237206A (en)
AT (1) ATE101911T1 (en)
DE (2) DE3822004A1 (en)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5275554A (en) * 1990-08-31 1994-01-04 Power-Flame, Inc. Combustion system with low NOx adapter assembly
GB9117253D0 (en) * 1991-08-09 1991-09-25 Eden Robert D Waste gas burner
JPH0642721A (en) * 1991-10-15 1994-02-18 Miura Co Ltd Self recirculation type combustion burner
DE4215763C2 (en) * 1992-05-13 1996-01-11 Ppv Verwaltungs Ag burner
FR2718222B1 (en) * 1994-03-29 1996-07-05 Pillard Ent Gle Chauffage Indl Improvements in gas fuel burners with very low nitrogen oxide emissions.
DE59607583D1 (en) * 1996-05-19 2001-10-04 Oertli Thermique S A Burner with exhaust gas recirculation
DE19654732C2 (en) * 1996-12-30 2000-10-05 Vorwaermer Und Kesselbau Koeth Shell boiler with exhaust gas recirculation
FR2766557B1 (en) * 1997-07-22 1999-10-22 Pillard Chauffage LIQUID AND GASEOUS FUEL BURNERS WITH LOW EMISSION OF NITROGEN OXIDES
FR2782150B1 (en) * 1998-08-07 2000-11-10 Pillard Chauffage IMPROVEMENTS ON LOW-EMITTING AND LOW-EMITTING NITROGEN OXIDES BURNER
FR2797321B1 (en) * 1999-08-04 2001-10-26 Pillard Chauffage LOW-EMISSION NITROGEN OXIDE SMOKE RECIRCULATION BURNERS AND GAS HEATERS COMPRISING SUCH BURNERS
GB0025244D0 (en) * 2000-10-12 2000-11-29 Holset Engineering Co Turbine
CN112728535B (en) * 2021-01-07 2022-08-09 宁波方太厨具有限公司 Combustor and contain its commercial kitchen

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Publication number Priority date Publication date Assignee Title
US4162140A (en) * 1977-09-26 1979-07-24 John Zink Company NOx abatement in burning of gaseous or liquid fuels
DE2820297A1 (en) * 1978-05-10 1979-11-15 Werner Mueller Glow ignited oil of gas burner - has additional consumable tube for flame arranged upstream of combustion space tube
US4380429A (en) * 1979-11-02 1983-04-19 Hague International Recirculating burner
JPS5726308A (en) * 1980-07-24 1982-02-12 Babcock Hitachi Kk Burner device
DE3327597A1 (en) * 1983-07-30 1985-02-07 Deutsche Babcock Werke AG, 4200 Oberhausen METHOD AND BURNER FOR BURNING LIQUID OR GASEOUS FUELS WITH REDUCED NOX PRODUCTION
AT387838B (en) * 1985-12-23 1989-03-28 Bruecker Helmut Dr OIL BURNER

Also Published As

Publication number Publication date
ATE101911T1 (en) 1994-03-15
US4979894A (en) 1990-12-25
JPH0237206A (en) 1990-02-07
DE58907023D1 (en) 1994-03-31
EP0348646A3 (en) 1991-07-03
DE3822004A1 (en) 1990-01-04
EP0348646A2 (en) 1990-01-03

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