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EP1369640B1 - Shut-off device for the pulverized coal burners of a combustion apparatus - Google Patents

Shut-off device for the pulverized coal burners of a combustion apparatus Download PDF

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Publication number
EP1369640B1
EP1369640B1 EP03011794A EP03011794A EP1369640B1 EP 1369640 B1 EP1369640 B1 EP 1369640B1 EP 03011794 A EP03011794 A EP 03011794A EP 03011794 A EP03011794 A EP 03011794A EP 1369640 B1 EP1369640 B1 EP 1369640B1
Authority
EP
European Patent Office
Prior art keywords
shut
air
sliding member
supply line
pulverized coal
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
EP03011794A
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German (de)
French (fr)
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EP1369640A3 (en
EP1369640A2 (en
Inventor
Alfons Leisse
Heinz Gräwe
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Hitachi Power Europe GmbH
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Hitachi Power Europe GmbH
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Filing date
Publication date
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Priority to SI200331427T priority Critical patent/SI1369640T1/en
Publication of EP1369640A2 publication Critical patent/EP1369640A2/en
Publication of EP1369640A3 publication Critical patent/EP1369640A3/en
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Publication of EP1369640B1 publication Critical patent/EP1369640B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D1/00—Burners for combustion of pulverulent fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus
    • F23K3/02—Pneumatic feeding arrangements, i.e. by air blast
    • 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
    • F23L13/00—Construction of valves or dampers for controlling air supply or draught
    • F23L13/10—Construction of valves or dampers for controlling air supply or draught having a compound movement involving both sliding and pivoting

Definitions

  • the invention relates to a shut-off device for pulverized coal burners of a pulverized coal firing with the features of the preamble of claim 1.
  • burners switched off during operation of the steam generator system are supplied with cooling air via the combustion air supply paths (secondary, tertiary air) for protection against thermal overload of the burner nozzles.
  • the primary tubes of the pulverized coal burners, via which the fuel is introduced during operation, are not flowed through by cool air when the burners are out of operation.
  • Such a shut-off device is off GB 153 746 A known.
  • the pulverized coal supply lines shall be provided with shut-off devices must be safely opened during operation of the corresponding supply systems and shut off after switching off the corresponding fuel supply device. This is usually done with shut-off devices in which a shut-off plate is pushed by an automatically actuated drive and / or by hand perpendicular to the flow axis in the cross section of the corresponding supply lines. This will complete the shut off of the corresponding fuel supply paths causes. In this state, there is no flow through the fuel paths and thus no cooling of the burner pulverized coal nozzle.
  • the invention has for its object to provide a closed system for cooling the Kohlenstaubwayssweges within a Kohlenstaubrenners by an air stream, without causing the necessary safety device, namely the shut-off of Kohlenstaubmakerssweges is impaired.
  • the coal pulverization plant shown consists of two times three pulverized coal burners 1, 2, which are connected in parallel and are supplied via two fuel supplies 3, 4 with coal dust.
  • the fuel supply 3, 4 may consist of a mill and / or an intermediate bunker.
  • the pulverized coal burners 1, 2 are designed as round burners with stepped combustion air guidance and each contain a central core air tube 5, which is surrounded concentrically by a primary tube 6, a secondary air tube 7 and a tertiary air tube 8. the central core air tube can also be omitted.
  • Each formed at the front end of the pulverized coal burner 1, 2 burner nozzle opens into a combustion chamber, not shown, a steam generator system.
  • the core air tube 5, the secondary air tube 7 and the tertiary air tube 8 are connected via air supply lines 9 and combustion air ducts 10 to a central combustion air supply 11.
  • the core air tube 5, the secondary air tube 7 and the tertiary air tube 8 are supplied from the combustion air supply 11 via the air supply lines 9 and the combustion air ducts 10 with combustion air before entering the Pulverized coal burner 1, 2 is divided as core air, secondary air and tertiary air.
  • flow meter 12 are arranged, and in the air supply lines 9 control or shut-off valves 13 are arranged.
  • Throttle valves 14 may also be arranged in the inlet region of the core air tube 5, the secondary air tube 7 and the tertiary air tube 8, which serve to supply combustion air quantities coordinated with one another to the air-conveying tubes. If an individual of the pulverized coal burners 1, 2 is taken out of operation, an air flow of small size is conducted as the cooling air flow through the tubes 5, 7, 8 leading to said combustion air streams.
  • the primary pipe 6 of each of the pulverized coal burners 1, 2 is connected to a supply line 15 which is connected to one of the fuel supplies 3, 4.
  • the fuel supplies 3, 4 are each connected to a primary air line 16, in which a flow meter 12 is arranged.
  • the primary air supplied to the fuel supply 3, 4 delivers the pulverized coal as a coal dust-air mixture to the primary pipes 6 of the pulverized coal burners 1, 2.
  • a shut-off valve 17 designed as a shut-off valve 17 is arranged in each supply line 15 and is aligned transversely to the axis of the flow direction of the pulverized coal-air mixture.
  • the gate valve 17 consists of a slide plate 18 to which a push rod 19 is attached ( Fig. 2 ). To the push rod 19 engages a drive motor 20 or a manual adjustment for actuating the slide plate 18 at. In the closed position of the gate valve 17, the slide plate 18 closes the cross section of the supply line 15 completely, as in Fig. 5 shown.
  • the shut-off device is combined with a cooling device for cooling the parts of the respective pulverized coal burners 1, 2, which carry the coal dust-air mixture.
  • a cooling medium is preferably a partial flow of the combustion air.
  • the combined shut-off cooling device of each pulverized coal burner 1, 2 is connected to a cooling air line 21, in which a shut-off device 22 is arranged ( Fig. 1 ).
  • the cooling air ducts 21 are preferably connected to the combustion air ducts 10.
  • the mill supplied cold air or flue gas can be used.
  • the cooling means of each of the respective pulverized coal burners 1, 2 consists of an air box 23 which is mounted downstream of the gate valve 17 downstream of the feed line 15 through which the pulverized coal-air mixture flows and is tightly connected thereto.
  • the air box 23 encloses downstream of the gate valve 17, the supply line 15 on all sides and tight.
  • the air box 23 is provided with an inlet port 24 which is connected to one of the cooling air pipes 21, respectively.
  • Fig. 3 to 5 is in the region of the air box 23 in the wall of the supply line 15, an opening 25 which is closed by a closing plate 26 from the interior of the air box 23 ago.
  • a first lever 27 is pivotally mounted on the closing plate 26.
  • the first lever 27, as well as a second lever 28 and a third lever 29 rotatably connected to a shaft 30 mounted in a rotary joint.
  • the shaft 30 is rotatably mounted in the air box 23 and protrudes sealed on both sides of the Air box 23 out.
  • the levers 28, 29 are rotatably connected outside of the air box 23 each having one of the protruding ends of the shaft 30.
  • a claimed to train spring 31 which is fixed outside of the air box 23.
  • the free end of the third lever 29 is connected to a link rod 32 which hingedly engages a fourth lever 33 which is rotatably connected to the shaft of a pinion 34.
  • the pinion 34 is operatively connected to a rack 35 which is mounted on the rear end of the slide plate 18 of the gate valve 17.
  • the combined shut-off and cooling device operates in the manner described below.
  • the supply pipe 15 for supplying the pulverized coal-air mixture to the respective pulverized coal burners 1, 2 is opened, and the opening 25 in the wall of the supply pipe 15 for the entry of the cooling air is closed.
  • the closing plate 26 is pressed by the first lever 27 and the second lever 28 fixedly connected to it by the laterally arranged spring 31 fixed to the opening 25 in the supply line 15.
  • the air box 23, which encloses the supply line 15 in this area, is filled with air, so that adjusts a uniform temperature in this region of the supply line 15.
  • the rack 35 drives the pinion 34, whereby the closing plate 26 is actuated against the effective spring force of the spring 31 via the fourth lever 33, the articulated rod 32, the third lever 29 and the first lever 27.
  • the actuation of the closing plate 26 thus takes place directly over the slide plate 18 of the gate valve 17.
  • the closing plate 26 is now the opening 25 free. In this position, the fuel supply route is safely shut off.
  • the cooling air flows through the opening 25 in the wall of the supply line 15 on the downstream side of the gate valve 17 and exits at the burner nozzle of the respective pulverized coal burner 1, 2 and into the combustion chamber.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)
  • Air Supply (AREA)
  • Sliding Valves (AREA)
  • Solid-Fuel Combustion (AREA)

Abstract

Shut-off device for pulverized coal burners of a pulverized coal furnace comprises a stop valve (17) provided with a slide plate (18) arranged in a feed line (15) to close the feed line. The feed line is tightly connected to an air receiver (23) on the downstream-side of the stop valve. An opening (25) closed by a closing plate (26) is located in the wall of the feed line in the region of the air receiver. The closing plate operates synchronously with the stop valve so that the opening is released when the stop valve is closed and the opening is closed when the stop valve is open. Preferred Features: The air receiver tightly surrounds the feed line on all sides on the downstream-side of the stop valve.

Description

Die Erfindung betrifft eine Absperreinrichtung an Kohlenstaubbrennern einer Kohlenstaubfeuerung mit den Merkmalen des Oberbegriffes des Anspruches 1.The invention relates to a shut-off device for pulverized coal burners of a pulverized coal firing with the features of the preamble of claim 1.

An Dampferzeugeranlagen, deren Feuerung mit zwei oder mehr Kohlenstaubbrennern ausgerüstet sind, werden während des Betriebes der Dampferzeugeranlage abgeschaltete Brenner zum Schutz gegen thermische Überlastung der Brennerdüsen mit Kühlluft über die Verbrennungsluftversorgungswege (Sekundär-, Tertiärluft) versorgt. Die Primärrohre der Kohlenstaubbrenner, über die während des Betriebes der Brennstoffeintrag erfolgt, werden bei außer Betrieb befindlichen Brennern nicht mit Kühlluft durchströmt. Eine derartige Absperreinrichtung ist aus GB 153 746 A bekannt.On steam generators whose furnaces are equipped with two or more pulverized coal burners, burners switched off during operation of the steam generator system are supplied with cooling air via the combustion air supply paths (secondary, tertiary air) for protection against thermal overload of the burner nozzles. The primary tubes of the pulverized coal burners, via which the fuel is introduced during operation, are not flowed through by cool air when the burners are out of operation. Such a shut-off device is off GB 153 746 A known.

Entsprechend aller gültigen Vorschriften bezüglich der Ausrüstung und des Betreibens von Kohlenstaubfeuerungen für Dampferzeugeranlagen, in denen Kohlenstaub über zwei oder mehr Brenner in den Feuerraum eingeblasen wird und die aus zwei oder mehr parallelen Brennstoffsystemen mit Kohlenstaub versorgt werden, müssen die Kohlenstaubversorgungsleitungen mit Absperreinrichtungen versehen sein, die während des Betriebes der entsprechenden Versorgungssysteme sicher geöffnet und nach dem Abstellen der entsprechenden Brennstoffversorgungseinrichtung abgesperrt werden müssen. Dies wird in der Regel mit Absperrvorrichtungen bewerkstelligt, bei denen eine Absperrplatte von einem automatisch betätigten Antrieb und/oder von Hand senkrecht zur Strömungsachse in den Querschnitt der entsprechenden Zuführungsleitungen geschoben wird. Dadurch wird die vollständige Absperrung der entsprechenden Brennstoffversorgungswege bewirkt. In diesem Zustand findet keine Durchströmung der Brennstoffwege und somit auch keine Kühlung der Brenner-Kohlenstaubdüse statt.In accordance with all applicable regulations relating to the equipment and operation of pulverized coal firing systems for steam generators in which pulverized coal is injected into the combustion chamber via two or more burners and supplied with pulverized coal from two or more parallel fuel systems, the pulverized coal supply lines shall be provided with shut-off devices must be safely opened during operation of the corresponding supply systems and shut off after switching off the corresponding fuel supply device. This is usually done with shut-off devices in which a shut-off plate is pushed by an automatically actuated drive and / or by hand perpendicular to the flow axis in the cross section of the corresponding supply lines. This will complete the shut off of the corresponding fuel supply paths causes. In this state, there is no flow through the fuel paths and thus no cooling of the burner pulverized coal nozzle.

Aufgrund der fehlenden Durchströmung und der Druck- und Geschwindigkeitsverhältnisse in dem Feuerraum der Kohlenstaubfeuerung können heiße Verbrennungsgase in die Brennstoffdüsen der abgeschalteten Brenner rezirkulieren. Insbesondere bei modernen NOx-armen Kohlenstaubbrennern, bei denen die Lage der Brennstoffdüsen möglichst weit in Richtung des Feuerraumes verschoben ist, bewirkt die hohe Einstrahlung eine intensive Temperaturerhöhung im Material der Brennerdüsen. Als Folge der Einstrahlung und der mangelnden Durchströmung kann eine frühzeitige Zerstörung der Kohlenstaubdüsen durch thermische Materialüberlastung eintreten.Due to the lack of flow and the pressure and velocity conditions in the combustion chamber of the pulverized coal combustion, hot combustion gases can recirculate into the fuel nozzles of the shut off burner. In particular, in modern NO x low-carbon pulverized coal burners, in which the position of the fuel nozzles is shifted as far as possible in the direction of the combustion chamber, the high irradiation causes an intense increase in temperature in the material of the burner nozzles. As a result of the irradiation and the lack of flow can premature destruction of the coal dust nozzles by thermal material overload occur.

Der Erfindung liegt die Aufgabe zugrunde, ein geschlossenes System zur Kühlung des Kohlenstaubversorgungsweges innerhalb eines Kohlenstaubrenners durch einen Luftstrom zu schaffen, ohne dass dabei die notwendige Sicherheitseinrichtung, nämlich die Absperrung des Kohlenstaubversorgungsweges, beeinträchtigt wird.The invention has for its object to provide a closed system for cooling the Kohlenstaubversorgungsweges within a Kohlenstaubrenners by an air stream, without causing the necessary safety device, namely the shut-off of Kohlenstaubversorgungsweges is impaired.

Die Aufgabe wird bei einer gattungsgemäßen Absperreinrichtung erfindungsgemäß durch die kennzeichnenden Merkmale des Anspruches 1 gelöst. Vorteilhafte Ausgestaltungen der Erfindung sind Gegenstand der Unteransprüche.The object is achieved in a generic shut-off device according to the invention by the characterizing features of claim 1. Advantageous embodiments of the invention are the subject of the dependent claims.

Durch die Kombination der Kühleinrichtung mit der Absperreinrichtung des Kohlenstaubbrenners wird ein geschlossenes System erzielt, das allen Sicherheitsvorschriften entspricht. Ferner ist sichergestellt, dass während des Betriebes des Kohlenstaubbrenners kein Kohlenstaub aus den dafür vorgesehenen Versorgungsleitungen in die Umgebung austreten kann.By combining the cooling device with the shut-off device of the pulverized coal burner, a closed system is achieved that complies with all safety regulations. Furthermore, it is ensured that during operation of the pulverized coal burner no coal dust from the designated supply lines can escape into the environment.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im Folgenden näher erläutert. Es zeigen

Fig. 1
das Schema einer Kohlenstaubfeuerungsanlage,
Fig. 2
einen Kohlenstaubbrenner der Kohlenstaubfeuerungsanlage nach Fig. 1,
Fig. 3
bis 5 eine Absperreinrichtung für einen Kohlenstaubbrenner nach Fig. 2 in verschiedenen Betriebsstellungen.
An embodiment of the invention is illustrated in the drawing and will be explained in more detail below. Show it
Fig. 1
the scheme of a pulverized coal combustion plant,
Fig. 2
a pulverized coal burner of the pulverized coal combustion plant Fig. 1 .
Fig. 3
to 5 a shut-off device for a pulverized coal burner Fig. 2 in different operating positions.

Die dargestellte Kohlenstaubfeuerungsanlage besteht aus zweimal drei Kohlenstaubbrennern 1, 2, die parallel geschaltet sind und über zwei Brennstoffversorgungen 3, 4 mit Kohlenstaub versorgt werden. Je nach den gegebenen Anforderungen an die Kohlenstaubfeuerungsanlage kann auch eine andere Anzahl von Brennstoffversorgungen 3, 4 und Kohlenstaubbrennern 1, 2 vorgesehen werden. Die Brennstoffversorgung 3, 4 kann aus einer Mühlenanlage und/oder einem Zwischenbunker bestehen.The coal pulverization plant shown consists of two times three pulverized coal burners 1, 2, which are connected in parallel and are supplied via two fuel supplies 3, 4 with coal dust. Depending on the given requirements for the pulverized coal combustion plant, a different number of fuel supplies 3, 4 and pulverized coal burners 1, 2 can be provided. The fuel supply 3, 4 may consist of a mill and / or an intermediate bunker.

Die Kohlenstaubbrenner 1, 2 sind als Rundbrenner mit gestufter Verbrennungsluftführung ausgebildet und enthalten jeweils ein zentrales Kernluftrohr 5, das von einem Primärrohr 6, einem Sekundärluftrohr 7 und einem Tertiärluftrohr 8 konzentrisch umgeben ist. das zentrale Kernluftrohr kann auch entfallen. Die jeweils am vorderen Ende der Kohlenstaubbrenner 1, 2 ausgebildete Brennerdüse mündet in einen nicht gezeigten Feuerraum einer Dampferzeugeranlage. Das Kernluftrohr 5, das Sekundärluftrohr 7 und das Tertiärluftrohr 8 sind über Luftzuleitungen 9 und Verbrennungsluftleitungen 10 an eine zentrale Verbrennungsluftversorgung 11 angeschlossen. Das Kernluftrohr 5, das Sekundärluftrohr 7 und das Tertiärluftrohr 8 werden von der Verbrennungsluftversorgung 11 über die Luftzuleitungen 9 und die Verbrennungsluftleitungen 10 mit Verbrennungsluft versorgt, die vor dem Eintritt in den Kohlenstaubbrenner 1, 2 als Kernluft, Sekundärluft und als Tertiärluft aufgeteilt wird. In den Verbrennungsluftleitungen 10 sind Durchflussmesser 12 angeordnet, und in den Luftzuleitungen 9 sind Regel- oder Absperrklappen 13 angeordnet. Wie in Fig. 2 gezeigt, können im Eintrittsbereich des Kernluftrohres 5, des Sekundärluftrohres 7 und des Tertiärluftrohres 8 ebenfalls Drosselklappen 14 angeordnet sein, die dazu dienen, den luftführenden Rohren aufeinander abgestimmte Verbrennungsluftmengen zuzuführen. Ist ein einzelner der Kohlenstaubbrenner 1, 2 außer Betrieb genommen, so wird durch die die genannten Verbrennungsluftströme führenden Rohre 5, 7, 8 ein Luftstrom von geringer Größe als Kühlluftstrom geführt.The pulverized coal burners 1, 2 are designed as round burners with stepped combustion air guidance and each contain a central core air tube 5, which is surrounded concentrically by a primary tube 6, a secondary air tube 7 and a tertiary air tube 8. the central core air tube can also be omitted. Each formed at the front end of the pulverized coal burner 1, 2 burner nozzle opens into a combustion chamber, not shown, a steam generator system. The core air tube 5, the secondary air tube 7 and the tertiary air tube 8 are connected via air supply lines 9 and combustion air ducts 10 to a central combustion air supply 11. The core air tube 5, the secondary air tube 7 and the tertiary air tube 8 are supplied from the combustion air supply 11 via the air supply lines 9 and the combustion air ducts 10 with combustion air before entering the Pulverized coal burner 1, 2 is divided as core air, secondary air and tertiary air. In the combustion air ducts 10 flow meter 12 are arranged, and in the air supply lines 9 control or shut-off valves 13 are arranged. As in Fig. 2 Throttle valves 14 may also be arranged in the inlet region of the core air tube 5, the secondary air tube 7 and the tertiary air tube 8, which serve to supply combustion air quantities coordinated with one another to the air-conveying tubes. If an individual of the pulverized coal burners 1, 2 is taken out of operation, an air flow of small size is conducted as the cooling air flow through the tubes 5, 7, 8 leading to said combustion air streams.

Das Primärrohr 6 jedes der Kohlenstaubbrenner 1, 2 ist an eine Zuführungsleitung 15 angeschlossen, die mit einer der Brennstoffversorgungen 3, 4 verbunden ist. Die Brennstoffversorgungen 3, 4 sind jeweils mit einer Primärluftleitung 16 verbunden, in der ein Durchflussmesser 12 angeordnet ist. Die der Brennstoffversorgung 3, 4 zugeführte Primärluft fördert den Kohlenstaub als ein Kohlenstaub-Luft-Gemisch zu den Primärrohren 6 der Kohlenstaubbrenner 1, 2.The primary pipe 6 of each of the pulverized coal burners 1, 2 is connected to a supply line 15 which is connected to one of the fuel supplies 3, 4. The fuel supplies 3, 4 are each connected to a primary air line 16, in which a flow meter 12 is arranged. The primary air supplied to the fuel supply 3, 4 delivers the pulverized coal as a coal dust-air mixture to the primary pipes 6 of the pulverized coal burners 1, 2.

Vor dem Eintritt in die jeweiligen Kohlenstaubbrenner 1, 2 ist in jeder Zuführungsleitung 15 eine als Absperrschieber 17 ausgebildete Absperreinrichtung angeordnet, die quer zu der Achse der Strömungsrichtung des Kohlenstaub-Luft-Gemisches ausgerichtet ist. Der Absperrschieber 17 besteht aus einer Schieberplatte 18, an der eine Schubstange 19 befestigt ist (Fig. 2). An die Schubstange 19 greift ein Antriebsmotor 20 oder eine Handverstellung zur Betätigung der Schieberplatte 18 an. In der Schließstellung des Absperrschiebers 17 verschließt die Schieberplatte 18 den Querschnitt der Zuführungsleitung 15 vollständig, wie in Fig. 5 dargestellt.Prior to entry into the respective pulverized coal burners 1, 2, a shut-off valve 17 designed as a shut-off valve 17 is arranged in each supply line 15 and is aligned transversely to the axis of the flow direction of the pulverized coal-air mixture. The gate valve 17 consists of a slide plate 18 to which a push rod 19 is attached ( Fig. 2 ). To the push rod 19 engages a drive motor 20 or a manual adjustment for actuating the slide plate 18 at. In the closed position of the gate valve 17, the slide plate 18 closes the cross section of the supply line 15 completely, as in Fig. 5 shown.

Die Absperreinrichtung ist mit einer Kühleinrichtung zur Kühlung der Teile der jeweiligen Kohlenstaubbrenner 1, 2 kombiniert, die das Kohlenstaub-Luft-Gemisch führen. Als Kühlmedium dient vorzugsweise ein Teilstrom der Verbrennungsluft. Zu diesem Zweck ist die kombinierte Absperr-Kühleinrichtung eines jeden Kohlenstaubbrenners 1, 2 mit einer Kühlluftleitung 21 verbunden, in der ein Absperrorgan 22 angeordnet ist (Fig. 1). Die Kühlluftleitungen 21 sind vorzugsweise an die Verbrennungsluftleitungen 10 angeschlossen. Je nach den Betriebserfordernissen und nach der Lage des Einbauortes des Absperrschiebers 17 kann anstelle der heißen Verbrennungsluft aus der Verbrennungsluftversorgung auch andere in der Kohlenstaubfeuerungsanlage verfügbare Luft, z. B. die der Mühle zugeführte Kaltluft oder auch Rauchgas verwendet werden.The shut-off device is combined with a cooling device for cooling the parts of the respective pulverized coal burners 1, 2, which carry the coal dust-air mixture. As a cooling medium is preferably a partial flow of the combustion air. For this purpose, the combined shut-off cooling device of each pulverized coal burner 1, 2 is connected to a cooling air line 21, in which a shut-off device 22 is arranged ( Fig. 1 ). The cooling air ducts 21 are preferably connected to the combustion air ducts 10. Depending on the operating requirements and according to the location of the installation of the gate valve 17, instead of the hot combustion air from the combustion air supply and other available in the pulverized coal combustion air, eg. B. the mill supplied cold air or flue gas can be used.

Im Einzelnen besteht die Kühleinrichtung jedes der jeweiligen Kohlenstaubbrenner 1, 2 aus einem Luftkasten 23, der stromabwärts von dem Absperrschieber 17 seitlich an der von dem Kohlenstaub-Luft-Gemisch durchströmten Zuführungsleitung 15 angebracht und mit dieser dicht verbunden ist. Vorzugsweise umschließt der Luftkasten 23 stromabwärts von dem Absperrschieber 17 die Zuführungsleitung 15 allseitig und dicht. Der Luftkasten 23 ist mit einem Eintrittstutzen 24 versehen, der jeweils an eine der Kühlluftleitungen 21 angeschlossen ist.Specifically, the cooling means of each of the respective pulverized coal burners 1, 2 consists of an air box 23 which is mounted downstream of the gate valve 17 downstream of the feed line 15 through which the pulverized coal-air mixture flows and is tightly connected thereto. Preferably, the air box 23 encloses downstream of the gate valve 17, the supply line 15 on all sides and tight. The air box 23 is provided with an inlet port 24 which is connected to one of the cooling air pipes 21, respectively.

Gemäß Fig. 3 bis 5 ist im Bereich des Luftkastens 23 in der Wand der Zuführungsleitung 15 eine Öffnung 25 vorgesehen, die durch eine Schließplatte 26 vom Inneren des Luftkastens 23 her verschließbar ist. Auf der der Öffnung 25 abgewandten Seite ist an der Schließplatte 26 ein erster Hebel 27 gelenkig angebracht. Der erste Hebel 27 ist ebenso wie ein zweiter Hebel 28 und ein dritter Hebel 29 drehfest mit einer in einem Drehgelenk gelagerten Welle 30 verbunden. Die Welle 30 ist drehbar in dem Luftkasten 23 gelagert und ragt beidseitig abgedichtet aus dem Luftkasten 23 heraus. Die Hebel 28, 29 sind außerhalb des Luftkastens 23 jeweils mit einem der herausragenden Enden der Welle 30 drehfest verbunden. An das freie Ende des zweiten Hebels 28 greift eine auf Zug beanspruchten Feder 31 an, die außerhalb an dem Luftkasten 23 befestigt ist. Das freie Ende des dritten Hebels 29 ist mit einer Gelenkstange 32 verbunden, die gelenkig an einen vierten Hebel 33 angreift, der drehfest mit der Welle eines Ritzels 34 verbunden ist. Das Ritzel 34 steht in Wirkverbindung mit einer Zahnstange 35, die auf dem hinteren Ende der Schieberplatte 18 des Absperrschiebers 17 angebracht ist.According to Fig. 3 to 5 is in the region of the air box 23 in the wall of the supply line 15, an opening 25 which is closed by a closing plate 26 from the interior of the air box 23 ago. On the side facing away from the opening 25, a first lever 27 is pivotally mounted on the closing plate 26. The first lever 27, as well as a second lever 28 and a third lever 29 rotatably connected to a shaft 30 mounted in a rotary joint. The shaft 30 is rotatably mounted in the air box 23 and protrudes sealed on both sides of the Air box 23 out. The levers 28, 29 are rotatably connected outside of the air box 23 each having one of the protruding ends of the shaft 30. At the free end of the second lever 28 engages a claimed to train spring 31, which is fixed outside of the air box 23. The free end of the third lever 29 is connected to a link rod 32 which hingedly engages a fourth lever 33 which is rotatably connected to the shaft of a pinion 34. The pinion 34 is operatively connected to a rack 35 which is mounted on the rear end of the slide plate 18 of the gate valve 17.

Die kombinierte Absperr- und Kühleinrichtung arbeitet in der nachfolgend beschriebenen Weise. In der Betriebssituation der Kohlenstaubfeuerungsanlage (Fig. 3) ist die Zuführungsleitung 15 für die Zufuhr des Kohlenstaub-Luft-Gemisches zu den jeweiligen Kohlenstaubbrennern 1, 2 geöffnet, und die Öffnung 25 in der Wand der Zuführungsleitung 15 für den Eintritt der Kühlluft ist verschlossen. Dabei wird die Schließplatte 26 über den ersten Hebel 27 und den fest mit ihm verbundenen zweiten Hebel 28 von der seitlich angeordneten Feder 31 fest auf die Öffnung 25 in der Zuführungsleitung 15 gedrückt. Der Luftkasten 23, der die Zuführungsleitung 15 in diesem Bereich umschließt, ist mit Luft gefüllt, so dass sich in diesem Bereich der Zuführungsleitung 15 eine gleichmäßige Temperatur einstellt. Dadurch ist ein Verziehen der Zuführungsleitung 15 und der Schließplatte 26 durch ungleiche thermische Beanspruchung ausgeschlossen. Der statische Druck der Kühlluft in dem Luftkasten 23 ist immer höher als der statische Druck des Kohlenstaub-Luft-Gemisches in der Zuführungsleitung 15. Dadurch ist eine eventuelle Leckage nur in Richtung des Strömungsweges des Kohlenstaub-Luft-Gemisches möglich, so dass ein Austreten von Kohlenstaub in den Luftkasten 23 nicht erfolgen kann.The combined shut-off and cooling device operates in the manner described below. In the operating situation of the pulverized coal combustion plant ( Fig. 3 ), the supply pipe 15 for supplying the pulverized coal-air mixture to the respective pulverized coal burners 1, 2 is opened, and the opening 25 in the wall of the supply pipe 15 for the entry of the cooling air is closed. In this case, the closing plate 26 is pressed by the first lever 27 and the second lever 28 fixedly connected to it by the laterally arranged spring 31 fixed to the opening 25 in the supply line 15. The air box 23, which encloses the supply line 15 in this area, is filled with air, so that adjusts a uniform temperature in this region of the supply line 15. As a result, warping of the supply line 15 and the closing plate 26 is excluded by unequal thermal stress. The static pressure of the cooling air in the air box 23 is always higher than the static pressure of the pulverized coal-air mixture in the supply line 15. Thus, any leakage is possible only in the direction of the flow path of the pulverized coal-air mixture, so that leakage of Carbon dust in the air box 23 can not be done.

In der in Fig. 4 gezeigten Betriebsstellung des Absperrschibers 17 ist die Brennstoffzufuhr zu dem betreffenden der jeweiligen Kohlenstaubbrenner 1, 2 bereits beendet und die Schieberplatte 18 des Absperrschiebers 17 schon zu 90% geschlossen. Die Zahnstange 35 ist auf der Schieberplatte 18 in einer solchen Entfernung von deren Vorderkante angebracht, dass die Zahnstange 35 im Zuge der Schließbewegung des Absperrschiebers 17 erst kurz vor Erreichen der Schließstellung in das Ritzel 34 eingreift. Die Schließplatte 26 wird dadurch noch immer von der Federkraft der Feder 31 in der Schließposition gehalten.In the in Fig. 4 shown operating position of the shut-off 17, the fuel supply to the relevant of the respective pulverized coal burner 1, 2 is already completed and the slide plate 18 of the gate valve 17 is already closed to 90%. The rack 35 is mounted on the slide plate 18 at such a distance from the front edge that the rack 35 engages in the course of the closing movement of the gate valve 17 shortly before reaching the closed position in the pinion 34. The closing plate 26 is thereby still held by the spring force of the spring 31 in the closed position.

Bei weiterer Absperrung der Zuführungsleitung 15 treibt die Zahnstange 35 das Ritzel 34 an, wodurch über den vierten Hebel 33, die Gelenkstange 32, den dritten Hebel 29 und den ersten Hebel 27 die Schließplatte 26 entgegen der wirksamen Federkraft der Feder 31 betätigt wird. Die Betätigung der Schließplatte 26 erfolgt damit direkt über die Schieberplatte 18 des Absperrschiebers 17. Die Schließplatte 26 gibt jetzt die Öffnung 25 frei. In dieser Position ist der Weg der Brennstoffversorgung sicher abgesperrt. Die Kühlluft strömt über die Öffnung 25 in der Wand der Zuführungsleitung 15 auf der Abströmseite des Absperrschiebers 17 ein und tritt an der Brennerdüse des jeweiligen der Kohlenstaubbrenner 1, 2 aus und in den Feuerraum ein. Durch diese Luftströmung wird neben der Kühlung des Primärrohres 6 und der Brennerdüse ein Rückströmen heißer Verbrennungsgase in die Kohlenstaubbrenner 1, 2 verhindert. Die Strömungsrichtung der Kühlluft und des Kohlenstaub-Luft-Gemisches ist in den Fig. 3 bis 5 durch Pfeile gekennzeichnet.Upon further shut-off of the supply line 15, the rack 35 drives the pinion 34, whereby the closing plate 26 is actuated against the effective spring force of the spring 31 via the fourth lever 33, the articulated rod 32, the third lever 29 and the first lever 27. The actuation of the closing plate 26 thus takes place directly over the slide plate 18 of the gate valve 17. The closing plate 26 is now the opening 25 free. In this position, the fuel supply route is safely shut off. The cooling air flows through the opening 25 in the wall of the supply line 15 on the downstream side of the gate valve 17 and exits at the burner nozzle of the respective pulverized coal burner 1, 2 and into the combustion chamber. Through this air flow, in addition to the cooling of the primary pipe 6 and the burner nozzle, a return flow of hot combustion gases into the pulverized coal burners 1, 2 is prevented. The flow direction of the cooling air and the pulverized coal-air mixture is in the Fig. 3 to 5 indicated by arrows.

Claims (6)

  1. Shut-off device in coal dust burners (1, 2) of a coal dust furnace, each coal dust burner (1, 2) having a primary pipe (6) which directs a coal dust/air mixture and which is connected to a supply line (15) to supply the coal dust/air mixture to the respective coal dust burners (1, 2) and a shut-off sliding member (17) which is provided with a sliding plate (18) being arranged in the supply line (15) in order to close the supply line (15), characterised in that the supply line (15) at the discharge side of the shut-off sliding member (17) is connected in a tight manner to an air chamber (23) which is acted on with air, in that, in the region of the air chamber (23) in the wall of the supply line (15), there is formed an opening (25) which can be closed by means of a closure plate (26), and in that the closure plate (26) is arranged so as to be able to be actuated in a synchronous manner with the shut-off sliding member (17) so that the opening (25) is released in the closure position of the shut-off sliding member (17) and closed in the open position of the shut-off sliding member (17).
  2. Shut-off device according to claim 1, characterised in that the air chamber (23) surrounds the supply line (15) in a tight manner at all sides at the discharge side of the shut-off sliding member (17).
  3. Shut-off device according to claim 1 or 2, characterised in that the static pressure of the air in the air chamber (23) is kept at a higher value than the pressure of the coal dust/air mixture in the supply line (15).
  4. Shut-off device according to any one of claims 1 to 3, characterised in that the closure plate (26) is provided with a rod assembly, which comprises a plurality of levers (27, 28, 29, 33) and an articulated rod (32) and with which a spring (31) engages which holds the closure plate (26) in a closure position and which is under tension, and which rod assembly is mechanically connected to the sliding plate (18) of the shut-off sliding member (17).
  5. Shut-off device according to claim 3 or 4, characterised in that a toothed rod (35) is fitted to the sliding plate (18) of the shut-off sliding member (17), in that the toothed rod (35) is intended to be brought into engagement with a pinion (34) which is supported in a fixed manner at the end of the closure path of the shut-off sliding member (17) and which is connected to the rod assembly by means of a lever (33) which is connected in a rotationally secure manner to the pinion (34).
  6. Shut-off device according to claims 3 and 4, characterised in that a first lever (27) is fitted in an articulated manner to the rear side of the closure plate (26) and is connected in a rotationally secure manner to a shaft (30) which is supported in the air chamber (23), in that the shaft (30) protrudes from the air chamber in a manner sealed at both ends, in that a second and a third lever (28, 29) are connected to the shaft (30) outside the air chamber (23), in that the spring (31) engages with the free end of the second lever (28), and in that the free end of the third lever (29) is connected in an articulated manner via an articulated rod (32) to the lever (33) which is connected in a rotationally secure manner by means of the pinion (34).
EP03011794A 2002-06-05 2003-05-24 Shut-off device for the pulverized coal burners of a combustion apparatus Expired - Lifetime EP1369640B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SI200331427T SI1369640T1 (en) 2002-06-05 2003-05-24 Shut-off device for the pulverized coal burners of a combustion apparatus

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10225082 2002-06-05
DE10225082A DE10225082B4 (en) 2002-06-05 2002-06-05 Shut-off device on pulverized coal burners of a pulverized coal firing

Publications (3)

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EP1369640A2 EP1369640A2 (en) 2003-12-10
EP1369640A3 EP1369640A3 (en) 2004-05-19
EP1369640B1 true EP1369640B1 (en) 2008-08-13

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EP03011794A Expired - Lifetime EP1369640B1 (en) 2002-06-05 2003-05-24 Shut-off device for the pulverized coal burners of a combustion apparatus

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US (1) US6807914B2 (en)
EP (1) EP1369640B1 (en)
JP (1) JP4279602B2 (en)
AT (1) ATE404817T1 (en)
AU (1) AU2003204529B2 (en)
CA (1) CA2429325A1 (en)
DE (2) DE10225082B4 (en)
DK (1) DK1369640T3 (en)
ES (1) ES2311657T3 (en)
HR (1) HRP20030457A2 (en)
PL (1) PL199357B1 (en)
PT (1) PT1369640E (en)
SI (1) SI1369640T1 (en)
UA (1) UA79738C2 (en)

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Also Published As

Publication number Publication date
PL360426A1 (en) 2003-12-15
SI1369640T1 (en) 2009-02-28
DE50310302D1 (en) 2008-09-25
ES2311657T3 (en) 2009-02-16
CA2429325A1 (en) 2003-12-05
DK1369640T3 (en) 2008-12-01
ATE404817T1 (en) 2008-08-15
EP1369640A3 (en) 2004-05-19
PT1369640E (en) 2008-11-12
PL199357B1 (en) 2008-09-30
EP1369640A2 (en) 2003-12-10
JP2004012124A (en) 2004-01-15
HRP20030457A2 (en) 2004-02-29
AU2003204529A1 (en) 2004-01-08
DE10225082B4 (en) 2007-04-26
AU2003204529B2 (en) 2008-05-29
US20030226482A1 (en) 2003-12-11
UA79738C2 (en) 2007-07-25
DE10225082A1 (en) 2004-01-08
JP4279602B2 (en) 2009-06-17
US6807914B2 (en) 2004-10-26

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