EP0670454B1 - Burner for brown coal - Google Patents

Burner for brown coal Download PDF

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Publication number
EP0670454B1
EP0670454B1 EP94120182A EP94120182A EP0670454B1 EP 0670454 B1 EP0670454 B1 EP 0670454B1 EP 94120182 A EP94120182 A EP 94120182A EP 94120182 A EP94120182 A EP 94120182A EP 0670454 B1 EP0670454 B1 EP 0670454B1
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EP
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Prior art keywords
burner
segments
mouth
air
fuel
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EP94120182A
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German (de)
French (fr)
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EP0670454A1 (en
Inventor
Heinz Gräwe
Alfons Leisse
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Babcock Kraftwerkstechnik GmbH
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Babcock Kraftwerkstechnik GmbH
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23DBURNERS
    • F23D1/00Burners for combustion of pulverulent fuel
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23DBURNERS
    • F23D2201/00Burners adapted for particulate solid or pulverulent fuels
    • F23D2201/20Fuel flow guiding devices
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23DBURNERS
    • F23D2209/00Safety arrangements
    • F23D2209/20Flame lift-off / stability
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23DBURNERS
    • F23D2900/00Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
    • F23D2900/01001Pulverised solid fuel burner with means for swirling the fuel-air mixture

Definitions

  • Coal dust burners for lignite are usually designed as jet burners with a rectangular cross-section, in whose center plane air nozzles are used. Below and above these burners and between them, further air nozzles are provided for the supply of under air, upper air and middle air.
  • the coal dust can escape from this burner under unfavorable conditions with an uneven dust distribution, whereby, due to the lack of ignition aids, the fuel is ignited late in the combustion chamber and under conditions that occur during the pyrolysis by admixing the top and bottom - and medium air partially lead to an increased excess of air and thus favor NO x formation.
  • Lignite naturally contains a high proportion of water, during grinding in the mill with the help of sucked hot flue gases evaporated to a large extent becomes.
  • the coal dust carrier gas flow introduces one high proportion of water vapor with it, the ignition properties of the fuel at the burner outlet is negatively affected.
  • a swirl body in the Provide dust line that connects the grinder to the burner connects. The swirl thus forced divides the coal dust carrier gas stream into a fuel-rich partial flow and into a low fuel vapor flow.
  • the vapor stream is either discharged outside after flowing through a filter or it is fed to separate vapor burners.
  • This Vapor burners are outside or as separate guide tubes arranged within the main burner (DE-OS 29 33 528; Brennst.-Wärme-Kraft 24 (1972) No. 3, pages 90 - 93).
  • the invention has for its object one for Combustion of dusty lignite suitable burner the Generic type to improve such that clear Ignition conditions are created.
  • the necessary to burn the remaining coal Burner air is assigned to each burner tube as secondary air fed. So that the ignition process at the burner outlet does not go through Air fluctuations, high exit speeds or Vortex formation can be disturbed, the secondary air is through an air repellent throat kept away and sufficiently delayed the Fuel products supplied.
  • a stabilizing ring is in connection with a swirl body in the case of burners for the combustion of dusty hard coal known.
  • coal is less Has water content as lignite during milling drying dried in the mill with preheated air so that, otherwise than when milling brown coal with hot flue gases, the water vapor content in the coal dust carrier gas stream is lower and the proportion of inert gases is missing.
  • the Coping with these material flows prepared during the combustion of dusty lignite difficulties and has only so far by separating the vapor in front of the burner.
  • FIG. 1 is a side view of a brown coal burner
  • 2 shows the section II - II of FIG. 1st
  • a Burner 3 for the combustion of dusty lignite arranged in an opening 1 of a side wall 2 of a combustion chamber.
  • the burner 3 consists of several, in the present Case of three individual burners 3.1, 3.2 arranged one above the other 3.3.
  • the individual burners 3.1, 3.2, 3.3 are in a refractory Brick lining 4.
  • Each individual burner 3.1, 3.2, 3.3 has a circular one Cross section on and consists of a burner tube 5.
  • Das Burner tube 5 is connected via a manifold 6 with a dust line 7 connected, which is led to a mill, not shown. In the mill grinds raw lignite and during grinding with the help of hot flue gas drawn in from the combustion chamber is dried. The flue gas also serves as Drying and carrier gas.
  • Burner tube 5 In the intake end of the manifold 6 facing Burner tube 5 is a swirl generator 8 with a center arranged displacement body 9 installed.
  • the swirl generator 8 is provided on its circumference with several blades that the displacement body 9 are attached.
  • the blades of the Swirl generator 8 are against the longitudinal axis of burner tube 5 arranged at an angle of 15 to 45 ° overlapping.
  • a stabilizing ring 10 In the mouth of the burner tube 5 is a stabilizing ring 10 arranged, which protrudes into the burner tube 5.
  • the Stabilizing ring 10 contains two groups of segments 11, which are spaced apart and evenly over the circumference are distributed.
  • the segments 11.1 of the first group are web-like with a small wall thickness and in Longitudinal direction of the burner tube 5 aligned.
  • Axial and radial are between the segments 11.1 of the first group Segments 11.2 of the second group. These segments are 11.2 seen shorter and in the circumferential direction of the burner tube 5 wider than the segments 11.1.
  • six segments 11.1, 11.2 each are provided.
  • the radial, in the burner tube 5 protruding length of the segments 11.1, 11.2 is about 10 to 20% of the inner diameter of the Burner tube 5. Its length in the circumferential direction can be 1 to 20% of the inner diameter of the burner tube 5.
  • the burner tube 6 is from an annular to the combustion chamber surrounded open air duct 13.
  • the air duct 13 is with a preferably spiral-shaped inlet housing 14 connected.
  • the combustion air is secondary air via the air duct 13 given up.
  • In the mouth cross section of the air duct 13 is on the burner tube 5 an air repellent groove 15 is arranged.
  • the end the air deflection throat 15 projects into the opening 1 of the side wall 2 of the firebox and is on this part as an after cone pointing towards the outside.
  • the pulverized and dried brown coal dust passes through the dust line 7 together with the carrier gas the manifold 6 in the burner tube 5.
  • the manifold 6 is as Impact manifold designed and with on the upstream side Provide baffle plates. A first takes place in the manifold 6 Separation of the coal particles from the Kolenstaub-carrier gas stream instead, by the downstream sinker 9 and the swirl generator 8 is amplified. This will be a Sheath current generated, preferably with carbon particles is enriched.
  • the fuel-rich jacket stream encloses a low-fuel vapor stream, the larger amounts of Contains water vapor and inert gases.
  • the in the sheath current protruding segments 11.1, 11.2 of the stabilizing ring 10 cause a turbulence of the sheath flow, whereby a safe ignition in the plane of the mouth of the burner tube 5 and a stable flame zone is created in the combustion chamber.
  • the pipe section 12 in the burner mouth prevents one Mass transfer between the partially swirled fuel-rich sheath flow and the oxygen and low-fuel, central vapor flow.
  • the pipe section 12 thus contributes to the further stabilization of the ignition.
  • the cone of the air deflection throat 15 holds the air duct 13 out escaping secondary air away from the burner mouth and thus prevents the ignition process from fluctuations in air and high exit speeds or vortex formation is affected.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)

Description

Kohlenstaubbrenner für Braunkohle sind üblicherweise als Strahlbrenner mit rechteckigem Querschnitt ausgebildet, in dessen Mittelebene Luftdüsen eingesetzt sind. Unterhalb und oberhalb dieser Brenner sowie zwischen diesen sind weitere Luftdüsen zur Zuführung von Unterluft, Oberluft und Mittelluft vorgesehen. Aus diesem Brenner kann der Kohlenstaub unter ungünstigen Verhältnissen mit einer ungleichmäßigen Staubverteilung austreten, wobei, bedingt, durch das Fehlen von Zündhilfen, das Anzünden des Brennstoffes verspätet im Feuerraum erfolgt und zwar unter Bedingungen, die im Verlauf der Pyrolyse durch Zumischen der Ober-, Unter- und Mittelluft partiell zu einem erhöhten Luftüberschuß führen und somit die NOx-Bildung begünstigen.Coal dust burners for lignite are usually designed as jet burners with a rectangular cross-section, in whose center plane air nozzles are used. Below and above these burners and between them, further air nozzles are provided for the supply of under air, upper air and middle air. The coal dust can escape from this burner under unfavorable conditions with an uneven dust distribution, whereby, due to the lack of ignition aids, the fuel is ignited late in the combustion chamber and under conditions that occur during the pyrolysis by admixing the top and bottom - and medium air partially lead to an increased excess of air and thus favor NO x formation.

Braunkohle beinhaltet von Natur aus einen hohen Wasseranteil, der während der Zerkleinerung in der Mühle mit Hilfe von angesaugten heißen Rauchgasen zu einem großen Teil verdampft wird. Infolgedessen führt der Kohlenstaub-Trägergas-Strom einen hohen Anteil an Wasserdampf mit sich, der die Zündeigenschaften des Brennstoffes am Brenneraustritt negativ beeinflußt. Zur Anreicherung des Kohlenstaubes in dem Kohlenstaub-Trägergas-Strom ist bekannt (DE-OS 29 33 528), einen Drallkörper in der Staubleitung vorzusehen, die die Mühle mit dem Brenner verbindet. Der hierdurch erzwungene Drall teilt den KohlenstaubTrägergas-Strom in einen brennstoffreichen Teilstrom und in einen brennstoffarmen Brüdenstrom auf. Der Brüdenstrom wird entweder nach Durchströmen eines Filters ins Freie abgeleitet oder er wird getrennten Brüdenbrennern zugeführt. Diese Brüdenbrenner sind außerhalb oder als gesonderte Führungsrohre innerhalb der Hauptbrenner angeordnet (DE-OS 29 33 528; Brennst.-Wärme-Kraft 24 (1972) Nr. 3, Seiten 90 - 93).Lignite naturally contains a high proportion of water, during grinding in the mill with the help of sucked hot flue gases evaporated to a large extent becomes. As a result, the coal dust carrier gas flow introduces one high proportion of water vapor with it, the ignition properties of the fuel at the burner outlet is negatively affected. For Enrichment of the coal dust in the coal dust carrier gas stream is known (DE-OS 29 33 528), a swirl body in the Provide dust line that connects the grinder to the burner connects. The swirl thus forced divides the coal dust carrier gas stream into a fuel-rich partial flow and into a low fuel vapor flow. The vapor stream is either discharged outside after flowing through a filter or it is fed to separate vapor burners. This Vapor burners are outside or as separate guide tubes arranged within the main burner (DE-OS 29 33 528; Brennst.-Wärme-Kraft 24 (1972) No. 3, pages 90 - 93).

Für die Verbrennung von Steinkohle, die im Rohzustand einen geringeren Wassergehalt als Braunkohle aufweist und die dementsprechend nach der Mahltrocknung auch einen geringeren Wasserdampfanteil im Kohlenstaub-Trägergas-Strom mit sich führt, werden in der Regel Rundbrenner verwendet. Bei bekannten Brennern dieser Art (EP-OS 445 938) ist in dem Staubkanal des Brenners eine Einrichtung vorgesehen, mit deren Hilfe der Staub auf den äußeren Umfang des Stromes konzentriert wird. Am Ende des Staubkanals ist ein Ring angeordnet, der in den freien Querschnitt des Staubkanals hineinragt und Vorsprünge aufweist, zwischen denen Lücken vorhanden sind. Die Aufgabe dieses Ringes ist es, eine Verwirbelung des Gemischstromes in der Mündung des Brenners zu erzeugen, um dadurch die Zündfähigkeit der staubförmigen Steinkohle zu erhöhen.For the combustion of hard coal, which in its raw state has lower water content than lignite and the accordingly, a smaller one after milling drying Proportion of water vapor in the coal dust carrier gas stream, circular burners are generally used. At acquaintances Burners of this type (EP-OS 445 938) is in the dust channel of the Brenner provided a device with the help of which dust is focused on the outer circumference of the stream. At the end A dust ring is arranged in the dust channel Cross section of the dust channel protrudes and has projections, between which there are gaps. The task of this ring is to swirl the mixture flow in the mouth of the To produce the burner, thereby reducing the ignitability of the to increase dusty hard coal.

Der Erfindung liegt die Aufgabe zugrunde, einen für die Verbrennung von staubförmiger Braunkohle geeigneten Brenner der gattungsgemäßen Art derart zu verbessern, daß eindeutige Zündbedingungen geschaffen werden.The invention has for its object one for Combustion of dusty lignite suitable burner the Generic type to improve such that clear Ignition conditions are created.

Diese Aufgabe wird bei einem gattungsgemäße Brenner (derartige Brenner sind aus der US-A-4 930 430 bekannt) erfindungsgemäß durch die kennzeichnenden Merkmale des Patentanspruches 1 gelöst. Vorteilhafte Ausgestaltungen der Erfindung ist Gegenstand der Unteransprüche.This object is achieved in a generic burner (such burners are known from US-A-4 930 430) according to the invention by the characterizing features of Claim 1 solved. Advantageous embodiments of the Invention is the subject of the dependent claims.

Hierbei wird innerhalb des Brenners selbst eine Brüdentrennung vorgenommen, wodurch der schlecht zündende und schlecht brennende Brüden, zentral von einem brennstoffreichen Mantelstrom umgeben, in den Feuerraum eingeführt wird. Ausgelöst durch die von dem Drallerzeuger im Brennerrohr erzwungene Rotationsströmung befinden sich die Braunkohlepartikel in diesem Mantelstrom nahezu vollständig an der Innenwandung des Brennerrohres. In der Brennermündung prallen diese Partikel auf einen Stabilisierungsring, der aus unterschiedlich ausgebildeten Segmenten besteht, die in den Mantelstrom hineinragen. Durch das Aufprallen auf die Segmente verlieren die Braunkohlepartikel ihre Fließgeschwindigkeit, werden reflektiert und von der vorhandenen Gasströmung in Richtung auf die Mitte des Brennerrohres zum Brenneraustritt hin erneut beschleunigt. Der in diesem Bereich angeordnete, von einem Teil der Segmente des Stabilisierungsringes geführte, als Brüdentrennrohr wirkende Rohrabschnitt verhindert, daß die reflektierten Braunkohlepartikel wieder mit dem Brüden vermischt werden.Here there is a vapor separation within the burner itself made the badly igniting and bad burning vapors, centrally from a fuel-rich Surround the sheath flow into which the combustion chamber is introduced. Triggered by the one forced by the swirl generator in the burner tube Rotational flow are the lignite particles in this Sheath flow almost completely on the inner wall of the Burner tube. These particles collide in the burner mouth a stabilizing ring made up of differently trained There are segments that protrude into the sheath flow. By the Impact on the segments lose the lignite particles their flow rate, are reflected and reflected by the existing gas flow towards the center of the Burner tube accelerated towards the burner outlet again. Of the arranged in this area, by a part of the segments of the Stabilization ring guided, acting as a vapor separation tube Pipe section prevents the reflected Lignite particles are mixed again with the vapors.

Durch das Abbremsen der Braunkohlepartikel wird kurzfristig, bei ausreichend vorhandener Zündenergie (wenn z. B. ein Öl-, Gas- oder Kohlefeuer im Feuerraum vorhanden ist) die Rückzündgeschwindigkeit für die ausgasenden Kohlepartikel partiell größer als deren Fließgeschwindigkeit. Auf diese Weise zündet der Braunkohlenstaub kontrolliert, in nahezu allen Betriebssituationen mit konstanten Bedingungen, unmittelbar am Brenneraustritt. Für das Anzünden der ausgasenden flüchtigen Kohlebestandteile ist der Eigenanteil an Sauerstoff und der Sauerstoffgehalt des Trägergases im Mantelstrom in jedem Fall ausreichend.By braking the lignite particles, at short notice sufficient available ignition energy (if e.g. an oil, gas or Coal fire is present in the firebox) Reignition rate for the outgassing coal particles partially greater than their flow rate. In this way the lignite dust ignites in a controlled manner, in almost all of them Operating situations with constant conditions, immediately on Burner outlet. For lighting the outgassing volatile Coal components are the own share of oxygen and the Oxygen content of the carrier gas in the jacket stream in any case sufficient.

Die zur Verbrennung der restlichen Kohle erforderliche Brennerluft wird als Sekundärluft jedem Brennerrohr zugeordnet zugeführt. Damit der Zündvorgang am Brenneraustritt nicht durch Luftschwankungen, hohe Austrittsgeschwindigkeiten oder Wirbelbildung gestört werden kann, wird die Sekundärluft durch eine Luftabweiskehle fern gehalten und ausreichend verzögert den Brennstoffprodukten zugeführt.The necessary to burn the remaining coal Burner air is assigned to each burner tube as secondary air fed. So that the ignition process at the burner outlet does not go through Air fluctuations, high exit speeds or Vortex formation can be disturbed, the secondary air is through an air repellent throat kept away and sufficiently delayed the Fuel products supplied.

Insgesamt wird auf die geschilderte Weise eine unkontrollierte Zündung und anschließende Verbrennung des Braunkohlenstaubes mit schwankenden Luftmengenverhältnissen und der damit verbundenen Neigung zur NOx-Bildung vermieden.Overall, an uncontrolled ignition and subsequent combustion of the lignite dust with fluctuating air volume ratios and the associated tendency towards NO x formation is avoided in the manner described.

Ein Stabilisierungsring in Verbindung mit einem Drallkörper ist zwar bei Brennern zur Verbrennung von staubförmiger Steinkohle bekannt. Jedoch wird Steinkohle, die einen geringeren Wassergehalt als Braunkohle aufweist, während der Mahltrocknung in der Mühle mit vorerhitzter Luft getrocknet, so daß, anders als bei der Mahltrocknung von Braunkohle mit heißen Rauchgasen, der Wasserdampfgehalt in dem Kohlenstaub-Trägergas-Strom geringer ist und der Anteil an inerten Gasen fehlt. Die Bewältigung dieser Stoffströme bereitete bei der Verbrennung von staubförmiger Braunkohle Schwierigkeiten und wurde bisher nur durch eine Abtrennung des Brüdens vor dem Brenner ermöglicht.A stabilizing ring is in connection with a swirl body in the case of burners for the combustion of dusty hard coal known. However, coal is less Has water content as lignite during milling drying dried in the mill with preheated air so that, otherwise than when milling brown coal with hot flue gases, the water vapor content in the coal dust carrier gas stream is lower and the proportion of inert gases is missing. The Coping with these material flows prepared during the combustion of dusty lignite difficulties and has only so far by separating the vapor in front of the burner.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im folgenden näher erläutert. Es zeigen: Fig. 1 die Seitenansicht eines Braunkohlenbrenners, Fig. 2 den Schnitt II - II nach Fig. 1.An embodiment of the invention is in the drawing shown and is explained in more detail below. Show it: 1 is a side view of a brown coal burner, 2 shows the section II - II of FIG. 1st

In einer Öffnung 1 einer Seitenwand 2 eines Feuerraumes ist ein Brenner 3 zur Verbrennung von staubförmiger Braunkohle angeordnet. Der Brenner 3 besteht aus mehreren, im vorliegenden Fall aus drei übereinander angeordneten Einzelbrennern 3.1, 3.2, 3.3. Die Einzelbrenner 3.1, 3.2, 3.3 liegen in einer feuerfesten Ausmauerung 4.In an opening 1 of a side wall 2 of a combustion chamber is a Burner 3 for the combustion of dusty lignite arranged. The burner 3 consists of several, in the present Case of three individual burners 3.1, 3.2 arranged one above the other 3.3. The individual burners 3.1, 3.2, 3.3 are in a refractory Brick lining 4.

Jeder Einzelbrenner 3.1, 3.2, 3.3 weist einen kreisförmigen Querschnitt auf und besteht aus einem Brennerrohr 5. Das Brennerrohr 5 ist über einen Krümmer 6 mit einer Staubleitung 7 verbunden, die zu einer nicht gezeigten Mühle geführt ist. In der Mühle wird Rohbraunkohle gemahlen und während des Mahlens mit Hilfe von heißem Rauchgas, das aus dem Feuerraum angesaugt wird, getrocknet. Das Rauchgas dient gleichzeitig als Trocknungs- und Trägergas.Each individual burner 3.1, 3.2, 3.3 has a circular one Cross section on and consists of a burner tube 5. Das Burner tube 5 is connected via a manifold 6 with a dust line 7 connected, which is led to a mill, not shown. In the mill grinds raw lignite and during grinding with the help of hot flue gas drawn in from the combustion chamber is dried. The flue gas also serves as Drying and carrier gas.

In dem dem Krümmer 6 zugewandten, eintrittsseitigen Ende des Brennerrohres 5 ist ein Drallerzeuger 8 mit einem mittig angeordneten Verdrängungsköper 9 installiert. Der Drallerzeuger 8 ist auf seinem Umfang mit mehreren Schaufeln versehen, die auf dem Verdrängungskörper 9 befestigt sind. Die Schaufeln des Drallerzeugers 8 sind gegen die Längsachse des Brennerrohres 5 mit einem Winkel von 15 bis 45° überdeckend angeordnet.In the intake end of the manifold 6 facing Burner tube 5 is a swirl generator 8 with a center arranged displacement body 9 installed. The swirl generator 8 is provided on its circumference with several blades that the displacement body 9 are attached. The blades of the Swirl generator 8 are against the longitudinal axis of burner tube 5 arranged at an angle of 15 to 45 ° overlapping.

In der Mündung des Brennerrohres 5 ist ein Stabilisierungsring 10 angeordnet, der in das Brennerrohr 5 hineinragt. Der Stabilisierungsring 10 enthält zwei Gruppen von Segmenten 11, die mit Abstand voneinander und gleichmäßig über den Umfang verteilt angeordnet sind. Die Segmente 11.1 der ersten Gruppe sind stegartig mit einer geringen Wanddicke ausgebildet und in Längsrichtung des Brennerrohres 5 ausgerichtet. Axial und radial zwischen den Segmenten 11.1 der ersten Gruppe befinden sich die Segmente 11.2 der zweiten Gruppe. Diese Segmente 11.2 sind kürzer und in Umfangsrichtung des Brennerrohres 5 gesehen breiter als die Segmente 11.1. In dem dargestellten Fall sind jeweils sechs Segmente 11.1, 11.2 vorgesehen. Die radiale, in das Brennerrohr 5 hineinragende Länge der Segmente 11.1, 11.2 beträgt etwa 10 bis 20 % des inneren Durchmessers des Brennerrohres 5. Ihre Länge in Umfangsrichtung kann 1 bis 20% des inneren Durchmessers des Brennerrohres 5 betragen.In the mouth of the burner tube 5 is a stabilizing ring 10 arranged, which protrudes into the burner tube 5. Of the Stabilizing ring 10 contains two groups of segments 11, which are spaced apart and evenly over the circumference are distributed. The segments 11.1 of the first group are web-like with a small wall thickness and in Longitudinal direction of the burner tube 5 aligned. Axial and radial are between the segments 11.1 of the first group Segments 11.2 of the second group. These segments are 11.2 seen shorter and in the circumferential direction of the burner tube 5 wider than the segments 11.1. In the case shown six segments 11.1, 11.2 each are provided. The radial, in the burner tube 5 protruding length of the segments 11.1, 11.2 is about 10 to 20% of the inner diameter of the Burner tube 5. Its length in the circumferential direction can be 1 to 20% of the inner diameter of the burner tube 5.

Im Bereich der Mündung des Brennerrohres 5 ist in einem radialen Abstand von der Innenkante des Stabilisierungsringes 10 ein Rohrabschnitt 12 angeordnet, der über die Segmente 11.1 des Stabilisierungsringes 10 an der Innenwand des Brennerrohres 5 abgestützt ist. Der Rohrabschnitt 12 ragt um ein Stück in das Brennerrohr 5 hinein und um ein Stück über die Mündung des Brennerrohres 5 hinaus.In the area of the mouth of the burner tube 5 is in a radial Distance from the inner edge of the stabilizing ring 10 Pipe section 12 arranged over the segments 11.1 of the Stabilizing ring 10 on the inner wall of the burner tube 5 is supported. The pipe section 12 protrudes a bit into that Burner tube 5 and a piece over the mouth of the Burner tube 5 addition.

Das Brennerrohr 6 ist von einem ringförmigen, zum Feuerraum hin offenen Luftkanal 13 umgeben. Der Luftkanal 13 ist mit einem vorzugsweise spiralenförmigen Eintrittsgehäuse 14 verbunden. Über den Luftkanal 13 wird die Verbrennungsluft als Sekundärluft aufgegeben. In dem Mündungsquerschnitt des Luftkanals 13 ist auf dem Brennerrohr 5 eine Luftabweiskehle 15 angeordnet. Das Ende der Luftabweiskehle 15 ragt in die Öffnung 1 der Seitenwand 2 des Feuerraumes hinein und ist auf diesem Teil als ein nach außen hin weisender Kegel ausgebildet.The burner tube 6 is from an annular to the combustion chamber surrounded open air duct 13. The air duct 13 is with a preferably spiral-shaped inlet housing 14 connected. The combustion air is secondary air via the air duct 13 given up. In the mouth cross section of the air duct 13 is on the burner tube 5 an air repellent groove 15 is arranged. The end the air deflection throat 15 projects into the opening 1 of the side wall 2 of the firebox and is on this part as an after cone pointing towards the outside.

Der in der Mühle gemahlene und getrocknete Braunkohlenstaub gelangt zusammen mit dem Trägergas durch die Staubleitung 7 über den Krümmer 6 in das Brennerrohr 5. Der Krümmer 6 ist als Prallkrümmer ausgebildet und auf der Anströmseite mit Prallplatten versehen. In dem Krümmer 6 findet eine erste Separation der Kohlepartikel aus dem Kolenstaub-Trägergas-Strom statt, die durch den stromabwärts gelegenen Verdrängungskörper 9 und den Drallerzeuger 8 verstärkt wird. Hierdurch wird ein Mantelstrom erzeugt, der bevorzugt mit Kohlepartikel angereichert ist. Der brennstoffreiche Mantelstrom umschließt einen brennstoffarmen Brüdenstrom, der größere Mengen an Wasserdampf und inerten Gasen enthält. Die in den Mantelstrom hineinragenden Segmente 11.1, 11.2 des Stabilisierungsringes 10 bewirken eine Verwirbelung des Mantelstromes, wodurch eine sichere Zündung in der Ebene der Mündung des Brennerrohres 5 sowie eine stabile Flammenzone in dem Feuerraum erzeugt wird. Der Rohrabschnitt 12 in der Brennermündung verhindert einen Stoffaustausch zwischen dem teilweise verwirbelten brennstoffreichen Mantelstrom und dem sauerstoff- und brennstoffarmen, zentralen Brüdenstrom. Der Rohrabschnitt 12 trägt damit zur weiteren Stabilisierung der Zündung bei. Der Kegel der Luftabweiskehle 15 hält die aus dem Luftkanal 13 austretende Sekundärluft von der Brennermündung fern und verhindert so, daß der Zündvorgang durch Luftschwankungen und hohe Austrittsgeschwindigkeiten oder Wirbelbildung beeinträchtigt wird.The pulverized and dried brown coal dust passes through the dust line 7 together with the carrier gas the manifold 6 in the burner tube 5. The manifold 6 is as Impact manifold designed and with on the upstream side Provide baffle plates. A first takes place in the manifold 6 Separation of the coal particles from the Kolenstaub-carrier gas stream instead, by the downstream sinker 9 and the swirl generator 8 is amplified. This will be a Sheath current generated, preferably with carbon particles is enriched. The fuel-rich jacket stream encloses a low-fuel vapor stream, the larger amounts of Contains water vapor and inert gases. The in the sheath current protruding segments 11.1, 11.2 of the stabilizing ring 10 cause a turbulence of the sheath flow, whereby a safe ignition in the plane of the mouth of the burner tube 5 and a stable flame zone is created in the combustion chamber. The pipe section 12 in the burner mouth prevents one Mass transfer between the partially swirled fuel-rich sheath flow and the oxygen and low-fuel, central vapor flow. The pipe section 12 thus contributes to the further stabilization of the ignition. Of the The cone of the air deflection throat 15 holds the air duct 13 out escaping secondary air away from the burner mouth and thus prevents the ignition process from fluctuations in air and high exit speeds or vortex formation is affected.

Claims (3)

  1. Burner for combustion of powdered brown coal, the mouth of which is arranged in the wall of a combustion chamber, wherein the burner (3) is connected with a mill by way of a powder duct (7), has a circular cross-section, is surrounded by an annular air channel (13) and is provided with a displacement body (9) and a swirl generator (8), characterised thereby that the swirl generator (8) together with the displacement body (9) is arranged in the inlet end of the burner (3) and produces a fuel-rich envelope flow and a fuel-weak vapour flow, that a stabilising ring (10) is arranged in the mouth of the burner (3) and has inwardly directed segments (11.1, 11.2) which are arranged at a lateral spacing from one another and project into the envelope flow, and that a pipe section (12) is arranged in the mouth of the burner (3) at a radial spacing from the inner edge of the stabilising ring (10) and is supported by way of the segments (11.1) of the stabilising ring (10) at the inner wall of the burner pipe (5).
  2. Burner according to claim 1, characterised thereby that the segments (11.1, 11.2) have a different length with respect to the length direction and circumferential direction of the stabilising ring (10) and that the segments (11.1, 11.2) of different length are respectively distributed in alternation over the circumference.
  3. Burner according to claim 1 or 2, characterised thereby that an air diverter throat (15), which is supported on the burner pipe (5) and is provided at its end with an outwardly pointing cone, is arranged in the mouth of the air channel (13).
EP94120182A 1994-03-04 1994-12-20 Burner for brown coal Expired - Lifetime EP0670454B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SI9430232T SI0670454T1 (en) 1994-03-04 1994-12-20 Burner for brown coal

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4407198 1994-03-04
DE4407198A DE4407198A1 (en) 1994-03-04 1994-03-04 Lignite burner

Publications (2)

Publication Number Publication Date
EP0670454A1 EP0670454A1 (en) 1995-09-06
EP0670454B1 true EP0670454B1 (en) 1999-03-10

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EP94120182A Expired - Lifetime EP0670454B1 (en) 1994-03-04 1994-12-20 Burner for brown coal

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EP (1) EP0670454B1 (en)
CZ (1) CZ284925B6 (en)
DE (2) DE4407198A1 (en)
GR (1) GR3029937T3 (en)
SI (1) SI0670454T1 (en)
SK (1) SK281846B6 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005032109B4 (en) * 2005-07-07 2009-08-06 Hitachi Power Europe Gmbh Carbon dust burner for low NOx emissions
EP3228935A1 (en) 2016-04-08 2017-10-11 Steinmüller Engineering GmbH Method for low nitrous oxide combustion of solid, liquid or gaseous fuels, especially coal dust, a burner and a furnace for performing said method

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8991323B2 (en) * 2008-11-14 2015-03-31 Babcock & Wilcox Power Generation Group, Inc. Bladed coal diffuser and coal line balancing device
GB2551166A (en) * 2016-06-08 2017-12-13 Doosan Babcock Ltd Burner
DE102017101670A1 (en) 2017-01-27 2018-08-02 Babcock Borsig Steinmüller Gmbh Burner, in particular lignite jet burners

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60226609A (en) * 1984-04-23 1985-11-11 Babcock Hitachi Kk Combustion device for coal
DD267548A1 (en) * 1987-11-30 1989-05-03 Thierbach Kraftwerk COAL DUST BURNER
US4930430A (en) * 1988-03-04 1990-06-05 Northern Engineering Industries Plc Burners
DD289321A5 (en) * 1989-11-23 1991-04-25 Technische Hochschule Zittau,De DEVICE FOR BURNING FUELS IN FAN COIL FUELS
FI98658C (en) * 1990-03-07 1997-07-25 Hitachi Ltd Burner for pulverized carbon, boiler for pulverized carbon and method for combustion of pulverized carbon
DE4103850A1 (en) * 1991-02-08 1992-08-13 Wahl Verschleiss Tech Ring for combustion nozzle of coal fired power station - has replaceable guide vanes made of wear resistant material

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005032109B4 (en) * 2005-07-07 2009-08-06 Hitachi Power Europe Gmbh Carbon dust burner for low NOx emissions
EP3228935A1 (en) 2016-04-08 2017-10-11 Steinmüller Engineering GmbH Method for low nitrous oxide combustion of solid, liquid or gaseous fuels, especially coal dust, a burner and a furnace for performing said method

Also Published As

Publication number Publication date
SI0670454T1 (en) 1999-06-30
EP0670454A1 (en) 1995-09-06
CZ284925B6 (en) 1999-04-14
SK281846B6 (en) 2001-08-06
SK150794A3 (en) 1995-10-11
DE59407926D1 (en) 1999-04-15
DE4407198A1 (en) 1995-09-07
GR3029937T3 (en) 1999-07-30
CZ302794A3 (en) 1995-11-15

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