EP1369640A2 - 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
EP1369640A2
EP1369640A2 EP03011794A EP03011794A EP1369640A2 EP 1369640 A2 EP1369640 A2 EP 1369640A2 EP 03011794 A EP03011794 A EP 03011794A EP 03011794 A EP03011794 A EP 03011794A EP 1369640 A2 EP1369640 A2 EP 1369640A2
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EP
European Patent Office
Prior art keywords
shut
air
feed line
lever
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.)
Granted
Application number
EP03011794A
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German (de)
French (fr)
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EP1369640B1 (en
EP1369640A3 (en
Inventor
Alfons Leisse
Heinz Gräwe
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Hitachi Power Europe GmbH
Original Assignee
Babcock Borsig Power Systems GmbH
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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 Coal dust burners of a coal dust combustion with the characteristics the preamble of claim 1.
  • the invention has for its object a closed System for cooling the coal dust supply path within of a coal dust burner without creating an air stream that the necessary safety device, namely the Blocking the coal dust supply route is impaired.
  • the coal dust combustion system shown consists of two three coal dust burners 1, 2, which are connected in parallel and supplied with coal dust via two fuel supplies 3, 4 become.
  • Fuel supplies 3, 4 and coal dust burners 1, 2 be provided.
  • the fuel supply 3, 4 can be from a Mill system and / or an intermediate bunker exist.
  • the coal dust burners 1, 2 are circular burners with stepped Combustion air duct trained and each contain central core air tube 5, which from a primary tube 6, a Secondary air tube 7 and a tertiary air tube 8 concentric is surrounded. the central core air tube can also be omitted.
  • the each at the front end of the coal dust burner 1, 2 trained burner nozzle opens into a not shown Combustion chamber of a steam generator plant.
  • the core air tube 5, the Secondary air tube 7 and the tertiary air tube 8 are over Air supply lines 9 and combustion air lines 10 to one central combustion air supply 11 connected.
  • the Core air tube 5, secondary air tube 7 and tertiary air tube 8 are from the combustion air supply 11 via the Air supply lines 9 and the combustion air lines 10 with Combustion air supplied before entering the Coal dust burner 1, 2 as core air, secondary air and as Tertiary air is divided.
  • flow meters 12 are arranged, and in the air supply lines 9 control or butterfly valves 13 are arranged.
  • Throttle valves 14 may be arranged, which serve the air-carrying pipes matched to each other Supply combustion air quantities. Is a single one Coal dust burner 1, 2 taken out of service, is by the pipes 5, 7, 8 carrying the combustion air flows mentioned an air stream of small size led as a cooling air stream.
  • the primary tube 6 of each of the coal dust burners 1, 2 is connected to one Feed line 15 connected to one of the Fuel supplies 3, 4 is connected.
  • the Fuel supplies 3, 4 are each with a Primary air line 16 connected in which a flow meter 12th is arranged.
  • the supplied to the fuel supply 3, 4 Primary air conveys the coal dust as a coal dust-air mixture to the primary tubes 6 of the coal dust burners 1, 2.
  • each feed line 15 Before entering the respective coal dust burner 1, 2 is in each feed line 15 as a gate valve 17th trained shut-off device arranged transversely to the Axis of the direction of flow of the coal dust-air mixture is aligned.
  • the gate valve 17 consists of a Slider plate 18 on which a push rod 19 is attached (Fig. 2).
  • the Slider plate 18 shows the cross section of the feed line 15 completely as shown in Fig. 5.
  • the shut-off device is equipped with a cooling device for cooling the parts of the respective coal dust burners 1, 2 combined, the lead the coal dust-air mixture. Serves as a cooling medium preferably a partial flow of the combustion air.
  • a cooling air line 21 in which a shut-off device 22 is arranged (FIG. 1).
  • the Cooling air lines 21 are preferably to the Combustion air lines 10 connected.
  • the Gate valve 17 can instead of the hot combustion air from the combustion air supply also others in the Coal dust combustion system available air, e.g. B. that of the mill supplied cold air or flue gas can be used.
  • the cooling device consists of each of the respective Coal dust burner 1, 2 from an air box 23, the downstream of the gate valve 17 on the side of the Coal dust-air mixture flowing through supply line 15 attached and tightly connected to it.
  • the air box 23 Preferably encloses the air box 23 downstream of the Gate valve 17 the supply line 15 on all sides and tight.
  • the air box 23 is provided with an inlet connection 24 which is each connected to one of the cooling air lines 21.
  • 3 to 5 is in the area of the air box 23 in the wall the feed line 15 is provided an opening 25 through a closing plate 26 from the inside of the air box 23 is lockable.
  • a first lever 27 is articulated.
  • the first lever 27 is like a second lever 28 and third lever 29 rotatably with one in a swivel mounted shaft 30 connected.
  • the shaft 30 is rotatable in the Air box 23 mounted and protrudes sealed on both sides of the Air box 23 out.
  • the levers 28, 29 are outside the Air box 23 each with one of the protruding ends of the Shaft 30 non-rotatably connected.
  • To the free end of the second Lever 28 engages a spring 31 under tension, which is attached to the outside of the air box 23.
  • the free end of the third lever 29 is connected to an articulated rod 32 which hinges to a fourth lever 33 which rotates with the shaft of a pinion 34 is connected.
  • the pinion 34 is in Active connection with a rack 35 on the rear End of the slide plate 18 of the gate valve 17 attached is.
  • the combined shut-off and cooling device works in the way described below.
  • the locking plate 26 is over the first Lever 27 and the second lever 28 fixedly connected to it the laterally arranged spring 31 firmly on the opening 25 in the feed line 15 pressed.
  • the air box 23, the Feed line 15 encloses in this area is with air filled so that the supply line 15 sets an even temperature. This is a Warping the feed line 15 and the closing plate 26 excluded due to unequal thermal stress.
  • the static pressure of the cooling air in the air box 23 is always higher than the static pressure of the coal dust-air mixture in the supply line 15. This is a possible leak only in the direction of the flow path of the coal dust-air mixture possible, so that coal dust escapes into the Air box 23 can not be done.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Solid-Fuel Combustion (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)
  • Air Supply (AREA)
  • Sliding Valves (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 Coal dust burners of a coal dust combustion with the characteristics 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.On steam generator systems, the firing of two or more Coal dust burners are equipped during the Operation of the steam generator system switched off burner Protection against thermal overload of the burner nozzles Cooling air via the combustion air supply routes (secondary, Tertiary air). The primary tubes of the coal dust burner, via which the fuel is introduced during operation, are not included with burners that are not in operation Cooling air flows through.

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.According to all valid regulations regarding the Equipment and operation of coal dust furnaces for Steam generating plants in which coal dust over two or more Burner is blown into the combustion chamber and which consists of two or more parallel fuel systems with coal dust the coal dust supply lines must be with Shut-off devices should be provided during operation of the corresponding supply systems safely opened and closed the parking of the corresponding Fuel supply device must be shut off. This is usually accomplished with shut-off devices at which a barrier plate from an automatically operated Drive and / or by hand perpendicular to the flow axis in the Cross section of the corresponding supply lines pushed becomes. This will completely shut off the corresponding fuel supply routes. In this Condition does not flow through the fuel paths and therefore also no cooling of the burner coal dust nozzle instead.

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 speed conditions in the combustion chamber of the coal dust burner, hot combustion gases can recirculate into the fuel nozzles of the burners that are switched off. Especially in modern low NOx pulverized coal burners, where the position of the fuel nozzle is as far as possible shifted toward the combustion chamber, causing the high irradiation intensive increase in temperature in the material of the burner nozzles. As a result of the radiation and insufficient flow, the coal dust nozzles can be destroyed prematurely by thermal material overload.

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 a closed System for cooling the coal dust supply path within of a coal dust burner without creating an air stream that the necessary safety device, namely the Blocking the coal dust supply route 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 task is with a generic shut-off device according to the invention by the characterizing features of Claim 1 solved. Advantageous embodiments of the invention are the subject of the subclaims.

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 coal dust burner is on closed system that meets all safety regulations equivalent. It also ensures that during the Operation of the coal dust burner no coal dust from the for it provided supply lines to escape into the environment can.

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 shown in the drawing and is explained in more detail below. Show it
Fig. 1
the diagram of a coal dust combustion plant,
Fig. 2
a coal dust burner of the coal dust combustion system according to FIG. 1,
Fig. 3
to 5 a shut-off device for a coal dust burner according to 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 dust combustion system shown consists of two three coal dust burners 1, 2, which are connected in parallel and supplied with coal dust via two fuel supplies 3, 4 become. Depending on the given requirements for the Coal dust combustion system can also have a different number Fuel supplies 3, 4 and coal dust burners 1, 2 be provided. The fuel supply 3, 4 can be from a Mill system and / or an intermediate bunker exist.

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 coal dust burners 1, 2 are circular burners with stepped Combustion air duct trained and each contain central core air tube 5, which from a primary tube 6, a Secondary air tube 7 and a tertiary air tube 8 concentric is surrounded. the central core air tube can also be omitted. The each at the front end of the coal dust burner 1, 2 trained burner nozzle opens into a not shown Combustion chamber of a steam generator plant. The core air tube 5, the Secondary air tube 7 and the tertiary air tube 8 are over Air supply lines 9 and combustion air lines 10 to one central combustion air supply 11 connected. The Core air tube 5, secondary air tube 7 and tertiary air tube 8 are from the combustion air supply 11 via the Air supply lines 9 and the combustion air lines 10 with Combustion air supplied before entering the Coal dust burner 1, 2 as core air, secondary air and as Tertiary air is divided. In the combustion air lines 10 flow meters 12 are arranged, and in the air supply lines 9 control or butterfly valves 13 are arranged. As in Fig. 2 shown, in the inlet area of the core air tube 5, the Secondary air tube 7 and the tertiary air tube 8 also Throttle valves 14 may be arranged, which serve the air-carrying pipes matched to each other Supply combustion air quantities. Is a single one Coal dust burner 1, 2 taken out of service, is by the pipes 5, 7, 8 carrying the combustion air flows mentioned an air stream of small size led as a cooling air stream.

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 tube 6 of each of the coal dust burners 1, 2 is connected to one Feed line 15 connected to one of the Fuel supplies 3, 4 is connected. The Fuel supplies 3, 4 are each with a Primary air line 16 connected in which a flow meter 12th is arranged. The supplied to the fuel supply 3, 4 Primary air conveys the coal dust as a coal dust-air mixture to the primary tubes 6 of the coal dust 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. Before entering the respective coal dust burner 1, 2 is in each feed line 15 as a gate valve 17th trained shut-off device arranged transversely to the Axis of the direction of flow of the coal dust-air mixture is aligned. The gate valve 17 consists of a Slider plate 18 on which a push rod 19 is attached (Fig. 2). A drive motor 20 or engages on the push rod 19 a manual adjustment for actuating the slide plate 18. In the closed position of the gate valve 17 closes the Slider plate 18 shows the cross section of the feed line 15 completely as shown in Fig. 5.

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 equipped with a cooling device for cooling the parts of the respective coal dust burners 1, 2 combined, the lead the coal dust-air mixture. Serves as a cooling medium preferably a partial flow of the combustion air. To this end is the combined shut-off cooling device for everyone Coal dust burner 1, 2 connected to a cooling air line 21, in which a shut-off device 22 is arranged (FIG. 1). The Cooling air lines 21 are preferably to the Combustion air lines 10 connected. Depending on the Operating requirements and according to the location of the installation location of the Gate valve 17 can instead of the hot combustion air from the combustion air supply also others in the Coal dust combustion system available air, e.g. B. that of 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.In particular, the cooling device consists of each of the respective Coal dust burner 1, 2 from an air box 23, the downstream of the gate valve 17 on the side of the Coal dust-air mixture flowing through supply line 15 attached and tightly connected to it. Preferably encloses the air box 23 downstream of the Gate valve 17 the supply line 15 on all sides and tight. The air box 23 is provided with an inlet connection 24 which is each connected to one of the cooling air lines 21.

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.3 to 5 is in the area of the air box 23 in the wall the feed line 15 is provided an opening 25 through a closing plate 26 from the inside of the air box 23 is lockable. On the side facing away from the opening 25 on the closing plate 26, a first lever 27 is articulated. The first lever 27 is like a second lever 28 and third lever 29 rotatably with one in a swivel mounted shaft 30 connected. The shaft 30 is rotatable in the Air box 23 mounted and protrudes sealed on both sides of the Air box 23 out. The levers 28, 29 are outside the Air box 23 each with one of the protruding ends of the Shaft 30 non-rotatably connected. To the free end of the second Lever 28 engages a spring 31 under tension, which is attached to the outside of the air box 23. The free end of the third lever 29 is connected to an articulated rod 32 which hinges to a fourth lever 33 which rotates with the shaft of a pinion 34 is connected. The pinion 34 is in Active connection with a rack 35 on the rear End of the slide plate 18 of the gate valve 17 attached is.

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 works in the way described below. In the operating situation of the Coal dust combustion system (FIG. 3) is the feed line 15 for the supply of the coal dust-air mixture to the respective Coal dust burners 1, 2 opened, and the opening 25 in the Wall of the supply line 15 for the entry of the cooling air is locked. The locking plate 26 is over the first Lever 27 and the second lever 28 fixedly connected to it the laterally arranged spring 31 firmly on the opening 25 in the feed line 15 pressed. The air box 23, the Feed line 15 encloses in this area is with air filled so that the supply line 15 sets an even temperature. This is a Warping the feed line 15 and the closing plate 26 excluded due to unequal thermal stress. The static pressure of the cooling air in the air box 23 is always higher than the static pressure of the coal dust-air mixture in the supply line 15. This is a possible leak only in the direction of the flow path of the coal dust-air mixture possible, so that coal dust escapes into 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 operating position of the gate valve shown in FIG. 4 17 is the fuel supply to that of the respective one Coal dust burner 1, 2 already finished and the slide plate 18 of gate valve 17 is already 90% closed. The Rack 35 is on the slide plate 18 in one Distance from the front edge attached to that the rack 35 only briefly in the course of the closing movement of the gate valve 17 engages in the pinion 34 before reaching the closed position. As a result, the closing plate 26 is still subject to the spring force the spring 31 held 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.When the supply line 15 is shut off, the Rack 35 on the pinion 34, causing the fourth lever 33, the link rod 32, the third lever 29 and the first Lever 27, the locking plate 26 against the effective spring force the spring 31 is actuated. The actuation of the closing plate 26 is done directly via the slide plate 18 of the Gate valve 17. The closing plate 26 now gives the opening 25 free. In this position is the way of fuel supply cordoned off safely. The cooling air flows through the opening 25 in the wall of the feed line 15 on the downstream side of the Gate valve 17 and occurs at the burner nozzle of the respective of the coal dust burners 1, 2 from and into the combustion chamber on. This air flow, in addition to cooling the Primary tube 6 and the burner nozzle a backflow hotter Combustion gases in the coal dust burner 1, 2 prevented. The Flow direction of the cooling air and the coal dust-air mixture is indicated by arrows in FIGS. 3 to 5.

Claims (6)

Absperreinrichtung an Kohlenstaubbrennern (1, 2) einer Kohlenstaubfeuerung, wobei jeder Kohlenstaubbrenner (1, 2) ein Kohlenstaub-Luft-Gemisch führendes Primärrohr (6) aufweist, das mit einer Zuführungsleitung (15) zur Zuführung des Kohlenstaub-Luft-Gemisches zu den jeweiligen Kohlenstaubbrennern (1, 2) verbunden ist und wobei in der Zuführungsleitung (15) ein mit einer Schieberplatte (18) versehener Absperrschieber (17) zum Verschließen der Zuführungsleitung (15) angeordnet ist, dadurch gekennzeichnet, dass die Zuführungsleitung (15) auf der Abströmseite des Absperrschiebers (17) mit einem mit Luft beaufschlagten Luftkasten (23) dicht verbunden ist, dass im Bereich des Luftkastens (23) in der Wand der Zuführungsleitung (15) eine durch eine Schließplatte (26) verschließbare Öffnung (25) angebracht ist und dass die Schließplatte (26) synchron mit dem Absperrschieber (17) so betätigbar angeordnet ist, dass die Öffnung (25) in der Schließstellung des Absperrschiebers (17) freigegeben und in Offenstellung des Absperrschiebers (17) verschlossen ist.Shut-off device on coal-dust burners (1, 2) of a coal-dust burner, each coal-dust burner (1, 2) having a primary pipe (6) carrying a coal-dust-air mixture, which has a feed line (15) for supplying the coal-dust-air mixture to the respective ones Coal dust burners (1, 2) is connected and wherein in the feed line (15) a gate valve (17) provided with a slide plate (18) for closing the feed line (15) is arranged, characterized in that the feed line (15) on the outflow side of the gate valve (17) is tightly connected to an air box (23) loaded with air, that in the area of the air box (23) in the wall of the feed line (15) there is an opening (25) which can be closed by a closing plate (26) and that the closing plate (26) is arranged so that it can be actuated synchronously with the gate valve (17) in such a way that the opening (25) is in the closed position of the gate valve (17) released and closed in the open position of the gate valve (17). Absperreinrichtung nach Anspruch 1, dadurch gekennzeichnet, dass der Luftkasten (23) die Zuführungsleitung (15) auf der Abströmseite des Absperrschiebers (17) allseitig dicht umschließt.Shut-off device according to claim 1, characterized in that the air box (23) tightly encloses the supply line (15) on all sides on the outflow side of the shut-off valve (17). Absperreinrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der statische Druck der Luft in dem Luftkasten (23) auf einen höheren Wert gehalten ist als der Druck des Kohlenstaub-Luft-Gemisches in der Zuführungsleitung (15). Shut-off device according to claim 1 or 2, characterized in that the static pressure of the air in the air box (23) is kept at a higher value than the pressure of the coal dust-air mixture in the feed line (15). Absperreinrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Schließplatte (26) mit einem aus mehreren Hebeln (27, 28, 29, 33) und einer Gelenkstange (32) bestehenden Gestänge versehen ist, an das eine die Schließplatte (26) in Schließstellung haltende, auf Zug beanspruchte Feder (31) angreift und das mit der Schieberplatte (18) des Absperrschiebers (17) mechanisch gekoppelt ist.Shut-off device according to one of claims 1 to 3, characterized in that the closing plate (26) is provided with a linkage consisting of a plurality of levers (27, 28, 29, 33) and an articulated rod (32), to which one the closing plate (26 ) engages in the closed position, spring (31) which is subjected to tension and which is mechanically coupled to the slide plate (18) of the gate valve (17). Absperreinrichtung nach Anspruch 3 oder 4, dadurch gekennzeichnet, dass auf der Schieberplatte (18) des Absperrschiebers (17) eine Zahnstange (35) angebracht ist, dass die Zahnstange (35) am Ende des Schließweges des Absperrschiebers (17) mit einem ortsfest gelagerten Ritzel (34) in Eingriff zu bringen ist, das über einen drehfest mit dem Ritzel (34) verbundenen Hebel (33) mit dem Gestänge verbunden ist.Shut-off device according to claim 3 or 4, characterized in that a toothed rack (35) is attached to the slide plate (18) of the shut-off slide (17), that the toothed rack (35) at the end of the closing path of the shut-off slide (17) with a fixedly mounted pinion (34) is to be brought into engagement, which is connected to the linkage via a lever (33) connected in a rotationally fixed manner to the pinion (34). Absperreinrichtung nach den Ansprüchen 3 und 4, dadurch gekennzeichnet, dass auf der Rückseite der Schließplatte (26) ein erster Hebel (27) gelenkig angebracht ist, der mit einer in dem Luftkasten (23) gelagerten Welle (30) drehfest verbunden ist, dass die Welle (30) beidseitig abgedichtet aus dem Luftkasten herausragt, dass außerhalb des Luftkastens (23) ein zweiter und ein dritter Hebel (28, 29) mit der Welle (30) verbunden sind, dass an das freie Ende des zweiten Hebels (28) die Feder (31) angreift und dass das freie Ende des dritten Hebels (29) über eine Gelenkstange (32) mit dem über das Ritzel (34) drehfest verbundenen Hebel (33) gelenkig verbunden ist.Shut-off device according to claims 3 and 4, characterized in that on the back of the closing plate (26) a first lever (27) is articulated, which is rotatably connected to a shaft (30) mounted in the air box (23) that the Shaft (30) sealed on both sides protrudes from the air box, that outside the air box (23) a second and a third lever (28, 29) are connected to the shaft (30), that at the free end of the second lever (28) Spring (31) engages and that the free end of the third lever (29) is articulated via an articulated rod (32) to the lever (33), which is non-rotatably connected via 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)

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DE10225082A DE10225082B4 (en) 2002-06-05 2002-06-05 Shut-off device on pulverized coal burners of a pulverized coal firing

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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)
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HR (1) HRP20030457A2 (en)
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WO2010108986A3 (en) * 2009-03-25 2011-05-19 Hitachi Power Europe Gmbh Combustion system of a steam generator designed for oxyfuel operation

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JP2004012124A (en) 2004-01-15
UA79738C2 (en) 2007-07-25
PL199357B1 (en) 2008-09-30
EP1369640B1 (en) 2008-08-13
PL360426A1 (en) 2003-12-15
AU2003204529B2 (en) 2008-05-29
ES2311657T3 (en) 2009-02-16
US20030226482A1 (en) 2003-12-11
PT1369640E (en) 2008-11-12
AU2003204529A1 (en) 2004-01-08
JP4279602B2 (en) 2009-06-17
EP1369640A3 (en) 2004-05-19
HRP20030457A2 (en) 2004-02-29
ATE404817T1 (en) 2008-08-15
CA2429325A1 (en) 2003-12-05
DK1369640T3 (en) 2008-12-01
DE50310302D1 (en) 2008-09-25
SI1369640T1 (en) 2009-02-28
DE10225082A1 (en) 2004-01-08
DE10225082B4 (en) 2007-04-26
US6807914B2 (en) 2004-10-26

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