EP0457417A2 - Burner - Google Patents
Burner Download PDFInfo
- Publication number
- EP0457417A2 EP0457417A2 EP91250129A EP91250129A EP0457417A2 EP 0457417 A2 EP0457417 A2 EP 0457417A2 EP 91250129 A EP91250129 A EP 91250129A EP 91250129 A EP91250129 A EP 91250129A EP 0457417 A2 EP0457417 A2 EP 0457417A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- air
- outlet
- flue gas
- core
- fuel
- 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.)
- Granted
Links
Images
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
- F23D14/24—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 at least one of the fluids being submitted to a swirling motion
-
- 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
- F23C9/08—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber for reducing temperature in combustion chamber, e.g. for protecting walls of combustion chamber
-
- 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
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L5/00—Blast-producing apparatus before the fire
- F23L5/04—Blast-producing apparatus before the fire by induction of air for combustion, e.g. using steam jet
-
- 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
- F23C2900/00—Special features of, or arrangements for combustion apparatus using fluid fuels or solid fuels suspended in air; Combustion processes therefor
- F23C2900/06041—Staged supply of oxidant
-
- 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
- F23C2900/00—Special features of, or arrangements for combustion apparatus using fluid fuels or solid fuels suspended in air; Combustion processes therefor
- F23C2900/09002—Specific devices inducing or forcing flue gas recirculation
Definitions
- the invention relates to a burner for gaseous, liquid or for gaseous and liquid fuel with a core air supply tube for supplying core air as the first combustion air component, with an annular second outlet for primary air surrounding the core air supply tube as the second combustion air component, and with one the second Outlet surrounding annular third outlet for secondary air as a third portion of combustion air, the outlet of the gaseous fuel also being annular to the central core air flow so that a first part of the gaseous fuel inside the burner can be introduced into the primary air flow and the second remaining part of the gaseous fuel into the secondary air flow is, the supplied quantities of core air and primary air on the one hand and of secondary air on the other hand can be set independently of one another, and the setting of the air flow quantities and the distribution of the fuel open quantities is such that the primary air / fuel mixture emerging from the second outlet together with the core air is substoichiometric and the secondary air / fuel mixture emerging from the third outlet is overstoichiometric, with a flue gas recirculation pipe having its front
- a burner of the type described above is known from its own patent application DE-OS 38 07 214. With this burner, the fuel is burned in two zones. In the first zone of the flame, a so-called premix flame is created, which has a high excess fuel, i.e. burns with a lack of air, so that the nitrogen oxide formation is greatly reduced in this zone, while the burnout then takes place in the second zone which is supplied with the mixture of secondary air and residual fuel, in which the flame has cooled further and in which the burnout takes place with excess air, which also reduces the formation of nitrogen oxides.
- a so-called premix flame is created, which has a high excess fuel, i.e. burns with a lack of air, so that the nitrogen oxide formation is greatly reduced in this zone, while the burnout then takes place in the second zone which is supplied with the mixture of secondary air and residual fuel, in which the flame has cooled further and in which the burnout takes place with excess air, which also reduces the formation of nitrogen oxides.
- a further reduction in the NO x values is achieved by returning flue gas to the flame.
- a flue gas return pipe opens into the rear end of the core air supply pipe of the burner, so that an annular gap is formed in the manner of an injector.
- the way the primary air / gas mixture and core air are fed creates a two-stage injector, the effect of which is that smoke gases are sucked back independently by the burner.
- the addition of the relatively cool, low-oxygen flue gas to the core air increases the NO x reduction for the substoichiometric flame zone.
- this effect is limited due to the small pressure difference between the place of extraction and the place of supply of the flue gas, since only a small flue gas volume flow is sucked back.
- the object of the invention is therefore to achieve a further reduction in the NO x values in the exhaust gas in burners of the type mentioned at the outset.
- this object is achieved in that a steam jet injector is integrated in the flue gas return pipe.
- the housing 1 of the burner 2 shown in FIG. 1 contains a combustion air supply 3 and a gas supply 4.
- the air supply 3 opens into a distributor 5.
- the core air supply pipe 8 is introduced via the chamber 6 and a control flap 7 first combustion air portion and the annular gap 9, on the other hand, primary air is supplied as the second combustion air portion, the supply to the annular gap 9 taking place via a swirl device 10.
- the annular gap 9 forms with the front end of the core air supply tube 8 an annular nozzle 11, from which the primary air converges into the combustion chamber.
- the gas supply 4 opens into a chamber 17 which has passages 18 to the annular gap 9 and passages 19 to the annular space in front of the annular nozzle 16, so that part of the gas is mixed with the primary air flow and the remaining part of the gas with the secondary air flow.
- the gas / air mixture that flows out of the ring nozzle 11 forms the first flame zone in which the ignition takes place, but in which only a pre-combustion takes place because of the excess gas.
- the swirling of the primary air leads behind the ring nozzle 11 to a negative pressure and thus to an internal backflow, which returns unburned fuel components to the flame root.
- the mixture of gas and secondary air emerging from the ring nozzle 16 forms the second flame zone, as a result of which an external backflow occurs, which stabilizes the flame.
- a conical blocking surface 20 between the ring nozzles 11 and 16 ensures flame stabilization.
- the sub-stoichiometric combustion in the first zone on the one hand and the super-stoichiometric combustion with the flame that has already cooled in the second zone on the other hand result in a strong reduction in the NO x values in the exhaust gas.
- the swirling of the primary air in front of the core air supply pipe 8 forms a negative pressure which not only causes the internal backflow within the flame, but also exerts a suction effect on the core air, the suction effect being all the greater, the less the primary air / gas mixture is made convergent.
- This negative pressure is now increased by the fact that the core air is directed by forming an injector at the inlet of the feed pipe 8. The suction effect becomes so great that it is sufficient to suck in flue gas, i.e. the core air also serves as a propellant for the return of the flue gases.
- the flue gas return pipe 21 opens into the rear end of the core air supply pipe 8, so that an annular gap 22 is formed in the manner of an injector.
- the way in which the primary air / gas mixture and core air are fed creates a two-stage injector, through the effect of which flue gas is sucked in independently, which cools the flame in addition to the fuel distribution and thereby further reduces the NO x values of the flue gas.
- FIG. 2 A practical arrangement of the flue gas return pipe is shown in FIG. 2 using the example of a so-called three-pass boiler. From the burner 1 with the adjoining combustion chamber 23, the combustion gases reach the rear turning chamber (not shown) in the direction of arrow 24 and flow back from there via the boiler section 25 consisting of individual trains into the front turning chamber 26, before going from there via the third , in turn, individual boiler parts, not shown, get out into the open.
- the flue gas return pipe 21 is connected to the front turning chamber 26 and is therefore short.
- the flue gas return pipe 21 is not connected to the turning chamber 26 as a whole, but rather directly to one or more trains 25. This reduces the speed of the returned flue gases. This reduces the pressure losses and the suction effect.
- FIG. 3 shows the steam jet injector 33 as an enlarged detail from FIG. 2. It consists, as is generally customary, of supply pipe 28, driving nozzle 29, inlet radius 30, mixing pipe 31 and diffuser 32. Steam is used as the blowing agent, which is required only in relatively small amounts is, so that much lower costs are incurred than with the otherwise usual fans with high power consumption.
- the NO x values can be reduced by approximately 30% compared to the burner which only works with self-priming.
- the burner described can not only be used as a pure gas burner.
- An oil lance 27 can be introduced into the core air supply pipe 8 in a known manner, so that the burner can be operated as a combination burner with gas and oil or as a pure oil burner.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Gas Burners (AREA)
- Manufacture, Treatment Of Glass Fibers (AREA)
Abstract
Description
Die Erfindung betrifft einen Brenner für gasförmigen, flüssigen oder für gasförmigen und flüssigen Brennstoff mit einem Kernluft-Zuführfohr für die Zuführung von Kernluft als ersten Verbrennungsluftanteil, mit einem das Kernluft-Zuführrohr umgebenden ringförmigen zweiten Auslaß für Primärluft als zweiten Verbrennungsluftanteil, und mit einem den zweiten Auslaß umgebenden ringförmigen dritten Auslaß für Sekundärluft als dritten Verbrennungsluftanteil, wobei der Auslaß des gasförmigen Brennstoffs ebenfalls ringförmig zum zentralen Kernluftstrom so erfolgt, daß ein erster Teil des gasförmigen Brennstoffs innerhalb des Brenners in den Primärluftstrom und der zweite restliche Teil des gasförmigen Brennstoffs in den Sekundärluftstrom einleitbar ist, wobei die zugeführten Mengen von Kernluft und Primärluft einerseits und von Sekundärluft andererseits unabhängig voneinander einstellbar sind, und die Einstellung der Luftstrommengen sowie die Aufteilung der Brennstoffmengen so erfolgt, daß das aus dem zweiten Auslaß austretende Primärluft-Brennstoffgemisch zusammen mit der Kernluft unterstöchiometrisch und das aus dem dritten Auslaß austretende Sekundärluft-Brennstoffgemisch überstöchiometrisch ist, wobei ein Rauchgas-Rückführungsrohr mit seinem vorderen Ende in das hintere Ende des Kernluft-Zuführrohres mündet und mit diesem eine Ringdüse als Durchlaß für die Kernluft bildet und das rückwärtige Ende des Rauchgas-Rückführungsrohres an einer Stelle in den Rauchgasweg eingebunden ist, die gegenüber der Feuerung einen geringen Druckunterschied aufweist.The invention relates to a burner for gaseous, liquid or for gaseous and liquid fuel with a core air supply tube for supplying core air as the first combustion air component, with an annular second outlet for primary air surrounding the core air supply tube as the second combustion air component, and with one the second Outlet surrounding annular third outlet for secondary air as a third portion of combustion air, the outlet of the gaseous fuel also being annular to the central core air flow so that a first part of the gaseous fuel inside the burner can be introduced into the primary air flow and the second remaining part of the gaseous fuel into the secondary air flow is, the supplied quantities of core air and primary air on the one hand and of secondary air on the other hand can be set independently of one another, and the setting of the air flow quantities and the distribution of the fuel open quantities is such that the primary air / fuel mixture emerging from the second outlet together with the core air is substoichiometric and the secondary air / fuel mixture emerging from the third outlet is overstoichiometric, with a flue gas recirculation pipe having its front end opening into the rear end of the core air supply pipe and forms with this an annular nozzle as a passage for the core air and the rear end of the flue gas recirculation pipe at one Is integrated in the flue gas path, which has a small pressure difference compared to the furnace.
Ein Brenner der oben beschriebenen Art ist aus der eigenen Patentanmeldung DE-OS 38 07 214 bekannt. Bei diesem Brenner wird der Brennstoff in zwei Zonen verbrannt. In der ersten Zone der Flamme entsteht eine sogenannte Vorgemischflamme, die mit hohem Brennstoffüberschuß, d.h. mit Luftmangel verbrennt, so daß in dieser Zone die Stickoxidbildung stark reduziert wird, während der Ausbrand dann in der mit dem Gemisch aus Sekundärluft und restlichem Brennstoff beschickten zweiten Zone erfolgt, in der die Flamme weiter abgekühlt ist und in der der Ausbrand mit Luftüberschuß erfolgt, was ebenfalls die Entstehung von Stickoxiden verringert.A burner of the type described above is known from its own patent application DE-OS 38 07 214. With this burner, the fuel is burned in two zones. In the first zone of the flame, a so-called premix flame is created, which has a high excess fuel, i.e. burns with a lack of air, so that the nitrogen oxide formation is greatly reduced in this zone, while the burnout then takes place in the second zone which is supplied with the mixture of secondary air and residual fuel, in which the flame has cooled further and in which the burnout takes place with excess air, which also reduces the formation of nitrogen oxides.
Eine weitere Verringerung der NOX-Werte wird durch eine Rückführung von Rauchgas in die Flamme erreicht. Dazu mündet ein Rauchgas-Rückführungsrohr in das hintere Ende des Kernluft-Zuführrohres des Brenners, so daß ein Ringspalt nach Art eines Injektors gebildet wird. Durch die Art der Zuführung von Primärluft-Gasgemisch und Kernluft entsteht so ein zweistufiger Injektor, durch dessen Wirkung Rauchgase eigenständig vom Brenner zurückgesaugt werden. Durch die Zumischung des relativ kühlen, sauerstoffarmen Rauchgases zu der Kernluft wird für die unterstöchiometrische Flammenzone die NOX-Minderung verstärkt. Dieser Effekt ist aber aufgrund des geringen Druckunterschiedes zwischen dem Ort der Absaugung und dem Ort der Zuführung des Rauchgases begrenzt, da nur ein geringer Rauchgas-Volumenstrom zurückgesaugt wird.A further reduction in the NO x values is achieved by returning flue gas to the flame. For this purpose, a flue gas return pipe opens into the rear end of the core air supply pipe of the burner, so that an annular gap is formed in the manner of an injector. The way the primary air / gas mixture and core air are fed creates a two-stage injector, the effect of which is that smoke gases are sucked back independently by the burner. The addition of the relatively cool, low-oxygen flue gas to the core air increases the NO x reduction for the substoichiometric flame zone. However, this effect is limited due to the small pressure difference between the place of extraction and the place of supply of the flue gas, since only a small flue gas volume flow is sucked back.
Obwohl mit diesem Brenner schon eine wesentliche Minderung der NOX-Werte im Abgas erreicht werden kann, ist es aufgrund der bekannten Umweltprobleme und der damit im Zusammenhang stehenden immer strenger werdenden gesetzlichen Forderungen hinsichtlich der Schadstoffbegrenzung im Abgas wünschenswert und erforderlich, diese Werte noch weiter zu senken.Although a significant reduction in the NO x values in the exhaust gas can already be achieved with this burner, it is desirable and due to the known environmental problems and the associated increasingly stringent legal requirements with regard to the limitation of pollutants in the exhaust gas required to lower these values even further.
Aufgabe der Erfindung ist es deshalb, bei Brennern der eingangs genannten Art eine weitere Reduzierung der NOX-Werte im Abgas zu erreichen.The object of the invention is therefore to achieve a further reduction in the NO x values in the exhaust gas in burners of the type mentioned at the outset.
Erfindungsgemäß wird diese Aufgabe dadurch gelöst, daß in das Rauchgas-Rückführungsrohr ein Dampfstrahlinjektor integriert ist.According to the invention, this object is achieved in that a steam jet injector is integrated in the flue gas return pipe.
Aufgrund der oben beschriebenen Gegebenheiten - 1. geringe Druckdifferenz zwischen dem Ort der Absaugung und dem Ort der Zuführung der Rauchgase, und 2. relativ kleiner Rauchgas-Volumenstrom - lassen sich bereits mit relativ geringen, ökonomisch sinnvollen Treibdampfmengen die NOX-Werte gegenüber der reinen Rauchgas-Rücksaugung erheblich verringern, da zum einen der Rauchgas-Volumenstrom erhöht wird und zum anderen die sauerstoffreie Treibdampfmenge zusätzlich zur NOX-Reduzierung beiträgt.Due to the circumstances described above - 1. low pressure difference between the place of extraction and the place of supply of the flue gases, and 2. relatively small flue gas volume flow - the NO x values compared to the pure ones can already be achieved with relatively small, economically sensible amounts of motive steam Significantly reduce flue gas re-suction, since on the one hand the flue gas volume flow is increased and on the other hand the oxygen-free amount of motive steam also contributes to NO x reduction.
Die Erfindung wird nachstehend anhand eines Ausführungsbeispiels näher erläutert. In der dazugehörigen Zeichnung zeigt:
- Fig. 1
- einen Brenner mit dreiflutiger Luftführung in Seitenansicht und Stirnansicht,
- Fig. 2
- schematisch eine Seitenansicht eines Brenners mit der Rauchgas-Rückführung von den Zügen in der vorderen Wendekammer eines Dreizug-Kessels mit einem neuerungsgemäß in das Rauchgas-Rückführungsrohr eingebundenen Dampfstrahlinjektor, und
- Fig. 3
- eine Einzelheit X nach Fig. 2 um 90° gedreht.
- Fig. 1
- a burner with three-flow air duct in side view and front view,
- Fig. 2
- schematically a side view of a burner with the flue gas recirculation from the trains in the front turning chamber of a three-pass boiler with a steam jet injector which is integrated into the flue gas recirculation pipe, and
- Fig. 3
- a detail X according to FIG. 2 rotated by 90 °.
Das Gehäuse 1 des in Fig. 1 dargestellten Brenners 2 enthält eine Verbrennungsluft-Zuführung 3 und eine Gaszuführung 4. Die Luftzuführung 3 mündet in einen Verteiler 5. Von diesem Verteiler 5 wird über die Kammer 6 und eine Regelklappe 7 dem Kernluft-Zuführrohr 8 ein erster Verbrennungsluftanteil und dem Ringspalt 9 andererseits Primärluft als zweiter Verbrennungsluftanteil zugeführt, wobei die Zuführung zum Ringspalt 9 über eine Dralleinrichtung 10 erfolgt. Der Ringspalt 9 bildet mit dem vorderen Ende des Kernluft-Zuführrohres 8 eine Ringdüse 11, aus der die Primärluft konvergierend in den Verbrennungsraum eintritt.The
Über eine Kammer 12 wird durch Regelklappen 13 Sekundärluft als dritter Verbrennungsluftanteil über ein Leitgitter 14 und eine Dralleinrichtung 15 über eine Ringdüse 16 ebenfalls konvergierend in den Verbrennungsraum geleitet. Die Ringdüse 16 umgibt die Ringdüse 11 auf einem größeren Durchmesser und befindet sich in Strömungsrichtung vor der Ringdüse 11.Via a chamber 12, secondary air as the third combustion air component is passed through
Die Gaszufuhr 4 mündet in eine Kammer 17, die Durchlässe 18 zum Ringspalt 9 und Durchlässe 19 zum Ringraum vor der Ringdüse 16 aufweist, so daß ein Teil des Gases dem Primärluftstrom und der restliche Teil des Gases dem Sekundärluftstrom zugemischt wird.The gas supply 4 opens into a
Die Einstellung der Luftmengen und die Aufteilung der Gasmenge erfolgt nun so, daß das aus der Ringdüse 11 austretende Gemisch aus Primärluft und Gas zusammen mit der Kernluft einen Gasüberschuß aufweist, und daß das Gemisch aus Sekundärluft und Gas einen Luftüberschuß aufweist, wobei die Regelung lastabhängig erfolgt, so daß Kern- und Primärluft den überwiegenden Verbrennungsluftanteil im unteren Lastbereich und die Sekundärluft den überwiegenden Verbrennungsluftanteil im oberen Lastbereich des Brenners bildet.The adjustment of the air quantities and the distribution of the gas quantity is now carried out in such a way that the mixture of primary air and gas emerging from the ring nozzle 11 has an excess of gas together with the core air, and that the mixture of secondary air and gas has an excess of air, the regulation being dependent on the load , so that core and primary air form the predominant combustion air component in the lower load range and the secondary air form the predominant combustion air component in the upper load range of the burner.
Das Gas/Luft-Gemisch, das aus der Ringdüse 11 ausströmt, bildet die erste Flammenzone, in der die Zündung erfolgt, in der aber wegen des Gasüberschusses nur eine Vorverbrennung erfolgt. Die Verdrallung der Primärluft führt hinter der Ringdüse 11 zu einem Unterdruck und damit zu einer inneren Rückströmung, die unverbrannte Brennstoffanteile zur Flammenwurzel zurückführt. Das aus der Ringdüse 16 austretende Gemisch aus Gas und Sekundärluft bildet die zweite Flammenzone, wodurch eine äußere Rückströmung entsteht, die die Flamme stabilisiert. Zusätzlich sorgt eine konische Sperrfläche 20 zwischen den Ringdüsen 11 und 16 für die Flammenstabilisierung. Die unterstöchiometrische Verbrennung in der ersten Zone einerseits und die überstöchiometrische, Verbrennung mit der in der zweiten Zone bereits abgekühlten Flamme andererseits bewirkt eine starke Reduzierung der NOX-Werte im Abgas.The gas / air mixture that flows out of the ring nozzle 11 forms the first flame zone in which the ignition takes place, but in which only a pre-combustion takes place because of the excess gas. The swirling of the primary air leads behind the ring nozzle 11 to a negative pressure and thus to an internal backflow, which returns unburned fuel components to the flame root. The mixture of gas and secondary air emerging from the
Wie schon erwähnt wurde, bildet sich durch die Verdrallung der Primärluft vor dem Kernluft-Zufuhrrohr 8 ein Unterdruck aus, der nicht nur die innere Rückströmung innerhalb der Flamme bewirkt, sondern der auch eine Saugwirkung auf die Kernluft ausübt, wobei die Saugwirkung umso größer ist, je weniger das Primärluft-Gasgemisch konvergent ausgebildet wird. Dieser Unterdruck wird nun noch dadurch verstärkt, daß die Kernluft durch Bildung eines Injektors am Eingang des Zuführrohres 8 gerichtet wird. Die Saugwirkung wird dadurch so groß, daß sie ausreicht, Rauchgas anzusaugen, d.h. die Kernluft dient zugleich als Treibmittel für die Zurückführung der Rauchgase.As already mentioned, the swirling of the primary air in front of the core air supply pipe 8 forms a negative pressure which not only causes the internal backflow within the flame, but also exerts a suction effect on the core air, the suction effect being all the greater, the less the primary air / gas mixture is made convergent. This negative pressure is now increased by the fact that the core air is directed by forming an injector at the inlet of the feed pipe 8. The suction effect becomes so great that it is sufficient to suck in flue gas, i.e. the core air also serves as a propellant for the return of the flue gases.
Bei dem dargestellten Brenner mündet das Rauchgas-Rückführungsrohr 21 in das hintere Ende des Kernluft-Zuführrohres 8, so daß ein Ringspalt 22 nach Art eines Injektors gebildet wird. Durch die Art der Zuführung von Primärluft-Gasgemisch und Kernluft entsteht so ein zweistufiger Injektor, durch dessen Wirkung Rauchgas eigenständig angesaugt wird, das zusätzlich zu der Brennstoffaufteilung die Flamme kühlt und dadurch die NOX-Werte des Rauchgases weiter herabsetzt.In the burner shown, the flue
Eine zweckmäßige Anordnung des Rauchgas-Rückführungsrohres zeigt Fig. 2 am Beispiel eines sogenannten Dreizug-Kessels. Vom Brenner 1 mit dem sich daran anschließenden Verbrennungsraum 23 gelangen die Verbrennungsgase in Richtung des Pfeils 24 in die nicht dargestellte hintere Wendekammer und strömen von dort zurück über den aus einzelnen Zügen 25 bestehenden Kesselteil in die vordere Wendekammer 26, bevor sie von dort über den dritten, wiederum einzelne Züge enthaltenden, nicht dargestellten Kesselteil ins Freie gelangen.A practical arrangement of the flue gas return pipe is shown in FIG. 2 using the example of a so-called three-pass boiler. From the
Bei diesem Kessel ist das Rauchgas-Rückführungsrohr 21 mit der vorderen Wendekammer 26 verbunden und dadurch kurz. Dabei ist dar Rauchgas-Rückführungsrohr 21 nicht an die Wendekammer 26 insgesamt, sondern direkt an einen oder mehrere Züge 25 angeschlossen. Hierdurch wird die Geschwindigkeit der zurückgeführten Rauchgase reduziert. Damit werden die Druckverluste geringer und die Saugwirkung größer.In this boiler, the flue
Gemäß der Erfindung wird nun ein Dampfstrahlinjektor 33 in das Rauchgas-Rückführungsrohr 21 eingebunden. Das geschieht zweckmäßigerweise, wie in Fig. 2 dargestellt, an einem Rohrkrümmer. Fig. 3 zeigt den Dampfstrahlinjektor 33 als Ausschnittsvergrößerung von Fig. 2. Er besteht, wie allgemein üblich, aus Zuführrohr 28, Treibdüse 29, Einlaufradius 30, Mischrohr 31 und Diffusor 32. Als Treibmittel wird Dampf eingesetzt, der nur in relativ kleinen Mengen erforderlich ist, so daß wesentlich geringere Kosten anfallen als bei den sonst üblichen Ventilatoren mit großer Leistungsaufnahme.According to the invention, a
Durch den Einsatz des Dampfstrahlinjektors 33 können die NOX-Werte gegenüber dem nur mit selbstansaugung arbeitenden Brenner um etwa 30% gesenkt werden.By using the
Der beschriebene Brenner ist nicht nur als reiner Gasbrenner verwendbar. Es kann in das Kernluft-Zuführrohr 8 in bekannter Weise eine Öllanze 27 eingeführt werden, so daß der Brenner als Kombinationsbrenner mit Gas und Öl oder aber als reiner Ölbrenner betreibbar ist.The burner described can not only be used as a pure gas burner. An
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE9005563U | 1990-05-16 | ||
DE9005563U DE9005563U1 (en) | 1990-05-16 | 1990-05-16 | burner |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0457417A2 true EP0457417A2 (en) | 1991-11-21 |
EP0457417A3 EP0457417A3 (en) | 1992-03-18 |
EP0457417B1 EP0457417B1 (en) | 1994-08-24 |
Family
ID=6853847
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP91250129A Expired - Lifetime EP0457417B1 (en) | 1990-05-16 | 1991-05-08 | Burner |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0457417B1 (en) |
AT (1) | ATE110458T1 (en) |
DE (2) | DE9005563U1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007048428A1 (en) * | 2005-10-28 | 2007-05-03 | L'Air Liquide Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude | Process and apparatus for low-nox combustion |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2576373A (en) * | 1947-11-07 | 1951-11-27 | Wetzel Frederick | Oil-burning boiler fire box with air and steam feeding means |
EP0006358A1 (en) * | 1978-06-19 | 1980-01-09 | John Zink Company | Burner for reduced NOx emission and control of flame length and spread |
DE3514756A1 (en) * | 1985-04-24 | 1986-11-06 | Peter 5030 Hürth Stautzebach | Additional device for fuel-oil burners |
DE3807214A1 (en) * | 1988-03-02 | 1989-09-14 | Koerting Ag | Burner |
EP0374423A2 (en) * | 1988-12-20 | 1990-06-27 | John Zink Gmbh | Atmospheric burner |
-
1990
- 1990-05-16 DE DE9005563U patent/DE9005563U1/en not_active Expired - Lifetime
-
1991
- 1991-05-08 DE DE59102608T patent/DE59102608D1/en not_active Expired - Fee Related
- 1991-05-08 EP EP91250129A patent/EP0457417B1/en not_active Expired - Lifetime
- 1991-05-08 AT AT91250129T patent/ATE110458T1/en not_active IP Right Cessation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2576373A (en) * | 1947-11-07 | 1951-11-27 | Wetzel Frederick | Oil-burning boiler fire box with air and steam feeding means |
EP0006358A1 (en) * | 1978-06-19 | 1980-01-09 | John Zink Company | Burner for reduced NOx emission and control of flame length and spread |
DE3514756A1 (en) * | 1985-04-24 | 1986-11-06 | Peter 5030 Hürth Stautzebach | Additional device for fuel-oil burners |
DE3807214A1 (en) * | 1988-03-02 | 1989-09-14 | Koerting Ag | Burner |
EP0374423A2 (en) * | 1988-12-20 | 1990-06-27 | John Zink Gmbh | Atmospheric burner |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007048428A1 (en) * | 2005-10-28 | 2007-05-03 | L'Air Liquide Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude | Process and apparatus for low-nox combustion |
Also Published As
Publication number | Publication date |
---|---|
EP0457417B1 (en) | 1994-08-24 |
ATE110458T1 (en) | 1994-09-15 |
EP0457417A3 (en) | 1992-03-18 |
DE9005563U1 (en) | 1990-07-19 |
DE59102608D1 (en) | 1994-09-29 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE3706234C2 (en) | ||
EP0276696B1 (en) | Hybrid burner for premix operation with gas and/or oil, particularly for gas turbine plants | |
DE69407565T2 (en) | FUEL INJECTION NOZZLE | |
DE69218576T2 (en) | Combustion chamber of a gas turbine | |
EP1262714A1 (en) | Burner with exhausts recirculation | |
DE2460740C3 (en) | Combustion chamber for gas turbine engines | |
EP0571704A2 (en) | Burner for pulverulent fuel | |
DE19545310A1 (en) | Pre-mixing burner for mixing fuel and combustion air before ignition | |
EP0394911B1 (en) | Combustion installation | |
EP0392158A2 (en) | Method for operating a combustion plant for fossil fuels | |
EP2037173B1 (en) | Burner head and method for one-step combustion of fuel in a combustion zone separated from the burner head | |
DE2817295A1 (en) | BURNER ARRANGEMENT | |
EP0602396B1 (en) | Method of operating a heat generator | |
CH682009A5 (en) | ||
DE4008692C2 (en) | Mixing device for forced draft burners | |
EP0457417B1 (en) | Burner | |
DE3737321C1 (en) | Device for burning Schweroel | |
DE2345838A1 (en) | BURNER | |
DE3541987C2 (en) | ||
EP0589226B1 (en) | Burner for liquid ot gaseous fuels | |
DE3807214A1 (en) | Burner | |
AT404399B (en) | METHOD AND BURNER FOR BURNING IN PARTICULAR LIQUID FUELS | |
DE4330082C2 (en) | Burner for the stoichiometric combustion of liquid or gaseous fuel | |
DE10114094C2 (en) | Process for burning dusty fuel in a power plant boiler | |
DE9202147U1 (en) | Mixing device for oil and gas burners with fan |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): AT CH DE FR LI NL SE |
|
PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
AK | Designated contracting states |
Kind code of ref document: A3 Designated state(s): AT CH DE FR LI NL SE |
|
17P | Request for examination filed |
Effective date: 19920909 |
|
17Q | First examination report despatched |
Effective date: 19940215 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AT CH DE FR LI NL SE |
|
REF | Corresponds to: |
Ref document number: 110458 Country of ref document: AT Date of ref document: 19940915 Kind code of ref document: T |
|
REF | Corresponds to: |
Ref document number: 59102608 Country of ref document: DE Date of ref document: 19940929 |
|
ET | Fr: translation filed | ||
EAL | Se: european patent in force in sweden |
Ref document number: 91250129.3 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: AT Payment date: 19950529 Year of fee payment: 5 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: SE Payment date: 19950530 Year of fee payment: 5 Ref country code: FR Payment date: 19950530 Year of fee payment: 5 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: NL Payment date: 19950531 Year of fee payment: 5 |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed | ||
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: CH Payment date: 19960411 Year of fee payment: 6 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: AT Effective date: 19960508 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Effective date: 19960509 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 19960717 Year of fee payment: 6 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NL Effective date: 19961201 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Effective date: 19970131 |
|
EUG | Se: european patent has lapsed |
Ref document number: 91250129.3 |
|
NLV4 | Nl: lapsed or anulled due to non-payment of the annual fee |
Effective date: 19961201 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LI Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19970531 Ref country code: CH Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19970531 |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19980203 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST |