EP0140075A2 - Dust introduction into a hot zone - Google Patents

Dust introduction into a hot zone Download PDF

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Publication number
EP0140075A2
EP0140075A2 EP84110743A EP84110743A EP0140075A2 EP 0140075 A2 EP0140075 A2 EP 0140075A2 EP 84110743 A EP84110743 A EP 84110743A EP 84110743 A EP84110743 A EP 84110743A EP 0140075 A2 EP0140075 A2 EP 0140075A2
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EP
European Patent Office
Prior art keywords
dust
distributor head
compressed air
entry according
outlet openings
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
EP84110743A
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German (de)
French (fr)
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EP0140075B1 (en
EP0140075A3 (en
Inventor
Hans Lüttger
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Ruhrkohle-Carborat GmbH
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Ruhrkohle-Carborat GmbH
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Priority to AT84110743T priority Critical patent/ATE31360T1/en
Publication of EP0140075A2 publication Critical patent/EP0140075A2/en
Publication of EP0140075A3 publication Critical patent/EP0140075A3/en
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Publication of EP0140075B1 publication Critical patent/EP0140075B1/en
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C21B5/001—Injecting additional fuel or reducing agents
    • C21B5/003—Injection of pulverulent coal
    • 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

Definitions

  • the invention relates to dust in a hot zone, in particular coal dust burners for hot water or steam boilers or hot gas generators with a dust metering.
  • Dust furnaces are generally suitable for all types of coal and various other types of fuel dust. Dust furnaces with a thermal output of up to 2,500 MW are built. Several single burners are interconnected in the large units. The lower limit for the use of dust furnaces is usually given as 60 MW. This limit is essentially economic. An expansion to the areas up to 1 MW is considered possible.
  • coal dust burner Possible uses of the coal dust burner range from the ceramic industry (tunnel furnaces), the metal industry (melting furnaces), to hot gas generators for drying systems, hot air generators, cement rotary kilns, lime rotary and lime shaft furnaces, gypsum systems and boiler systems.
  • All dust burners require a burner. Coal and air are introduced and mixed into the combustion chamber through the burner. Good mixing is an essential prerequisite for fast ignition, stable flame formation and good burnout.
  • the stable ignition of the dust requires the individual coal grain or dust grain to be heated from the burner outlet to the ignition temperature. Heating takes place mainly by mixing primary air and fuel with hot flame gas. In addition, there is also heating by radiation.
  • the flame lengths vary from less than 1 m for small burners to approximately 10 m for rotary kilns.
  • the object of the invention is therefore to create a trouble-free metering device.
  • this is achieved in that the Brennstaubdo - tion by means of adjustable metering screw from a small bunker withdrawal takes place.
  • the escaping material is fed to a non-controllable rotary valve.
  • Under the cellular wheel sluice there is a nozzle conveyor with a downstream distributor head that has at least two outlet openings.
  • the nozzle conveyor picks up the escaping fuel dust in a known manner.
  • the fuel dust is distributed evenly in the compressed air of the nozzle conveyor, so that a distribution of the compressed air flow in the downstream distributor head results in a corresponding distribution of the fuel dust quantity to the outlet openings of the distributor head.
  • the fuel dust is then fed to the burner in various compressed air flows from the distributor head.
  • the various fuel dust / compressed air flows advantageously open up the possibility of entering the fuel dust at several points in the burner instead of in a single flow at a single point.
  • the ignition and flame behavior of the burner can thus be advantageously influenced over a wide range by the arrangement of the entry openings.
  • the distributor head opens up a simple option for loading all of the inlet openings provided on the furnace. The entry is made on the blast furnace via the blow mold, d. H. the distributor head enables simple and advantageous distribution of the fuel dust onto the blow mold.
  • the distributor head has a maximum of 20 outlet openings.
  • at least one further distributor head is connected downstream of a first distributor head. At least two distributor heads are preferably connected downstream, from which the same fuel dust / compressed air streams can be drawn off.
  • the outlet openings run parallel to the inlet flow axis of the distributor head and are provided with an adjustable valve cone. With the help of the valve cone, the opening width of each outlet opening can be changed and the volume flow escaping through the outlet opening can be regulated.
  • outlet openings which are arranged distributed over a circular circumference around the inlet flow opening.
  • a flow body in the middle between the outlet openings e.g. B. in the form of a cone, which contributes to the distribution of the incoming fuel / compressed air mixture.
  • valve cone according to the invention as injectors is also particularly advantageous. Compressed air and / or even additional fuel dust can be metered in via these injectors, so that with the help of the injectors an individual influencing or additional controllability of the individual outlet flows is given to the distributor head.
  • the adjustable valve cones are optionally realized with an arrangement in the distributor housing which can be displaced in the longitudinal direction and an actuating device. From the valve cones, injectors are created by making openings and applying compressed air and / or fuel dust.
  • the distributor head is formed in several parts.
  • the fuel dust / compressed air mixture carried by the nozzle conveyor slows down.
  • the cross section of the fuel dust / compressed air flow increases, so that all the nozzles 4 arranged in the discharge part 3 are evenly charged with fuel dust / compressed air.
  • only two of a plurality of nozzles 4 arranged in a uniformly distributed manner are shown.
  • the nozzles 4 form the discharge openings of the distributor head.
  • the nozzles 4 are screwed into the discharge part 3.
  • Lines 5 are connected to the nozzles 4 and feed the escaping fuel dust / compressed air mixture to the desired intended use.
  • the distributor head has a substantially cylindrical shape. It consists of an entry part 6 and a discharge part 7. Both parts 6 and 7 are connected to one another like parts 1 and 3 according to FIG. 1.
  • the entry part 6 is provided with a conical inlet connection 8, to which the feed line 12 of the nozzle conveyor is connected.
  • the discharge part 7 has a centrally arranged flow body in the form of a cone 9. Around the cone 9 are on a Circumference of outlet openings arranged, which in turn are formed by nozzles 10.
  • the nozzles 10 are arranged evenly distributed and - like the nozzles 4 in the discharge part 3 of FIG. 1 - screwed into the discharge part 7. Lines 5 are also connected to the nozzles 10, as shown in FIG. 1, which feed the escaping fuel dust / compressed air mixture to the desired use.
  • valve cones 11 interact with the nozzles 10.
  • the valve cone 11 are slidably arranged in the inlet part 6, in a parallel arrangement to the longitudinal axis 12 of the distributor head.
  • glands 13 ensure adequate sealing.
  • the valve cones 11 are formed in several parts and consist of a tip with a passage opening 14 as well as an adjusting device and a fuel dust and / or compressed air supply.
  • the passage opening 14 is multi-stage, i. that is, it is drilled out as much as possible to keep flow resistances to a minimum. Drilling is done in stages.
  • a sleeve 15 is screwed to the valve cone 11, which is closed at the end facing away from the valve cone 11 and has a sheet 16 and a handle 17 for manual adjustment.
  • the sheet 16 has an elongated hole 18 in which the hexagon screw shown sits.
  • the screw is screwed into a ring 19 and serves to lock the sheet 16 in the desired position.
  • the ring 19 is attached to the tube 12.
  • a tube 20 is welded to the sleeve 15 and serves with a rod 21 on the one hand as a guide and on the other hand as a compressed air / fuel dust supply and / or measuring device.
  • the rod 21 is arranged displaceably in the distributor head.
  • a manometer 22 is connected to the tube 20 for measurement.
  • the air pressure upstream of the valve plug 11 is measured with the pressure gauge 22.
  • the compressed air feed is preferably done via a non Darge - turned conduit which is connected to the pipe 20 at the 23rd
  • the diameters of the nozzles 4 and 10 are each selected such that a certain negative pressure arises above the nozzle conveyor depending on the material to be transported and the distance from the fuel dust container to the point of use to be bridged by the nozzle conveyor. This preferably applies to the use of the dosing device in coal dust burners.
  • valve cone 11 When using a distributor head according to FIG. 2, the valve cone 11 is set so that overpressure is displayed on the pressure gauge 22.
  • the speeds in the nozzle conveyor are 10 - 24 m / sec, especially for use with coal dust burners.
  • the conveying distance in the exemplary embodiments according to FIGS. 1 and 2 is a maximum of 50 m, the conveying capacity is a maximum of 5 t of fuel dust per hour.
  • the number of injector nozzles is at least 3 and a maximum of 20 per distributor head.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Nozzles (AREA)
  • Processing Of Solid Wastes (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Solid Fuels And Fuel-Associated Substances (AREA)

Abstract

1. Dust introduction system into a hot zone, especially into a shaft furnace or pulverized coal burner for hot water or steam boilers or hot gas generators, comprising a metering apparatus, the metering apparatus consisting of a jet conveyor having a distributor head and at least two discharge openings (10), characterized in that the discharge openings (10) are orientated parallel and are each equipped with a single and independently adjustable valve cone (11), the valve cones (11) being also constructed as injectors.

Description

Die Erfindung betrifft einen Staubeintrag in eine heiße Zone, insbesondere Kohlenstaubbrenner für Warmwasser- oder Dampfkessel oder Heißgaserzeuger mit einer Staubdosierung.The invention relates to dust in a hot zone, in particular coal dust burners for hot water or steam boilers or hot gas generators with a dust metering.

Staubfeuerungen sind generell für alle Kohlenarten und verschiedenste andere Brennstäube geeignet. Staubfeuerungen werden bis zu 2 500 MW thermischer Leistung gebaut. In den großen Einheiten sind mehrere Einzelbrenner zusammengeschaltet. Die untere Grenze für den Einsatz von Staubfeuerungen wird meist mit 60 MW angegeben. Diese Grenze ist im wesentlichen wirtschaftlich bedingt. Eine Ausdehnung auf die Bereiche bis zu 1 MW wird für möglich gehalten.Dust furnaces are generally suitable for all types of coal and various other types of fuel dust. Dust furnaces with a thermal output of up to 2,500 MW are built. Several single burners are interconnected in the large units. The lower limit for the use of dust furnaces is usually given as 60 MW. This limit is essentially economic. An expansion to the areas up to 1 MW is considered possible.

Einsatzmöglichkeiten der Kohlenstaubbrenner reichen von der keramischen Industrie (Tunnelöfen), der Metallindustrie (Schmelzöfen), über Heißgaserzeuger für Trocknungsanlagen, Heißlufterzeuger, Zementdrehöfen, Kalkdreh- und Kalkschachtöfen, Gipsanlagen bis hin zu Kesselanlagen.Possible uses of the coal dust burner range from the ceramic industry (tunnel furnaces), the metal industry (melting furnaces), to hot gas generators for drying systems, hot air generators, cement rotary kilns, lime rotary and lime shaft furnaces, gypsum systems and boiler systems.

Alle Staubfeuerungen benötigen einen Brenner. Durch den Brenner werden Kohle und Luft in den Brennraum eingeführt und gemischt. Die gute Durchmischung ist eine wesentliche Voraussetzung für schnelle Zündung, stabile Flammenbildung und guten Ausbrand. Die stabile Zündung des Staubes erfordert eine Aufheizung des einzelnen Kohlekorns bzw. Staubkorns vom Brenneraustritt an auf Zündtemperatur. Die Aufheizung erfolgt hauptsächlich durch Vermischen von Primärluft und Brennstoff mit heißem Flammengas. Daneben erfolgt auch Aufheizung durch Strahlung.All dust burners require a burner. Coal and air are introduced and mixed into the combustion chamber through the burner. Good mixing is an essential prerequisite for fast ignition, stable flame formation and good burnout. The stable ignition of the dust requires the individual coal grain or dust grain to be heated from the burner outlet to the ignition temperature. Heating takes place mainly by mixing primary air and fuel with hot flame gas. In addition, there is also heating by radiation.

Die Flammenlängen schwanken zwischen weniger als 1 m bei kleinen Brennern bis hin zu annähernd 10 m bei Drehrohröfen.The flame lengths vary from less than 1 m for small burners to approximately 10 m for rotary kilns.

Die Regelung von Staubbrennern erfordert eine Änderung der Stoffströme. Entscheidend für die Regelbarkeit ist in jedem Fall die Staubdosierung. Als Dosieranlagen sind Schnecken bekannt, die aus einem Behälter kontinuierlich Brennstaub abziehen und diesen zu einer Eintragöffnung befördern, durch die der Brennstaub drucklos in den Feuerraum fallen kann. Daneben sind Dosiereinrichtungen für Kohlenstaub bekannt, die druckluftbetrieben sind. Die Kohlenstaubpartikel fallen in die Druckluftleitung und werden von der Druckluft in den Feuerraum mitgerissen. Insbesondere die druckluftbetriebene Einblasanlage verursacht Betriebsstörungen. Die Betriebsstörungen resultieren zumeist aus unerwünschten Verschiebungen des Verhältnisses Kohlenstaub zu Sauerstoff der Druckluft sowie aus unkontrollierten Druckverlusten bei Verringerung der Leistung. In "Stahl und Eisen", 103 (1983), Nr. 13, Seite 650 ist deshalb vorgeschlagen worden, die Dosiereinrichtung mit einer Zellenradschleuse zu versehen, deren Drehzahl stufenlos der Druckluft angepaßt wird. Gleichwohl sind derartige Anlagen nicht frei von Betriebsstörungen.The regulation of dust burners requires a change in the material flows. The dosing of dust is decisive for the controllability in any case. Snails are known as dosing systems, which continuously withdraw fuel dust from a container and feed it to it convey an entry opening through which the fuel dust can fall into the combustion chamber without pressure. In addition, metering devices for coal dust are known which are operated by compressed air. The coal dust particles fall into the compressed air line and are entrained in the combustion chamber by the compressed air. In particular, the compressed air-operated blowing system causes malfunctions. The malfunctions mostly result from undesirable shifts in the ratio of coal dust to oxygen in the compressed air and from uncontrolled pressure losses while reducing the output. In "Stahl und Eisen", 103 (1983), No. 13, page 650, it has therefore been proposed to provide the metering device with a cellular wheel sluice, the speed of which is continuously adapted to the compressed air. Nevertheless, such systems are not free from malfunctions.

Der Erfindung liegt daher die Aufgabe zugrunde, eine störungsfreie Dosiereinrichtung zu schaffen.The object of the invention is therefore to create a trouble-free metering device.

Nach der Erfindung wird das dadurch erreicht, daß die Brennstaubdo- sierung mittels regelbarer Dosierschnecke aus einem kleinen Entnahmebunker erfolgt. Das austretende Material wird einer nicht regelbaren Zellenradschleuse zugeleitet. Unter der Zellenradschleuse befindet sich ein Düsenförderer mit einem nachgeschalteten Verteilerkopf, der mindestens zwei Austrittsöffnungen aufweist. Der Düsenförderer nimmt in bekannter Weise den austretenden Brennstaub auf. Dabei verteilt sich der Brennstaub gleichmäßig in der Druckluft des Düsenförderers, so daß eine Aufteilung der Druckluftströmung im nachgeschalteten Verteilerkopf eine entsprechende Aufteilung der Brennstaubmenge auf die Austrittsöffnungen des Verteilerkopfes bewirkt. Von dem Verteilerkopf aus wird der Brennstaub dann in verschiedenen Druckluftströmungen dem Brenner zugeführt. Vorteilhafterweise öffnet sich mit den verschiedenen Brennstaub-/Druckluftströmungen die Möglichkeit, den Brennstaub - statt in einer einzigen Strömung an einer einzigen Stelle - an mehreren Stellen des Brenners in diesen einzutragen. Damit kann das Zünd- und Flammenver- ' halten des Brenners über die Anordnung der Eintragsöffnungen in weiten Bereichen vorteilhaft beeinflußt werden.According to the invention this is achieved in that the Brennstaubdo - tion by means of adjustable metering screw from a small bunker withdrawal takes place. The escaping material is fed to a non-controllable rotary valve. Under the cellular wheel sluice there is a nozzle conveyor with a downstream distributor head that has at least two outlet openings. The nozzle conveyor picks up the escaping fuel dust in a known manner. The fuel dust is distributed evenly in the compressed air of the nozzle conveyor, so that a distribution of the compressed air flow in the downstream distributor head results in a corresponding distribution of the fuel dust quantity to the outlet openings of the distributor head. The fuel dust is then fed to the burner in various compressed air flows from the distributor head. The various fuel dust / compressed air flows advantageously open up the possibility of entering the fuel dust at several points in the burner instead of in a single flow at a single point. The ignition and flame behavior of the burner can thus be advantageously influenced over a wide range by the arrangement of the entry openings.

Bei unmittelbarer Eintragung des Brennstaubes in eine heiße Zone wie beispielsweise einen Hochofen eröffnet der Verteilerkopf eine einfache Möglichkeit zur Beschickung aller am Ofen vorgesehenen Eintragöffnungen. Die Eintragung erfolgt an den Hochöfen über die Blasform, d. h. der Verteilerkopf ermöglicht eine einfache und vorteilhafte Verteilung des Brennstaubes auf die Blasform.If the fuel dust is immediately introduced into a hot zone such as a blast furnace, the distributor head opens up a simple option for loading all of the inlet openings provided on the furnace. The entry is made on the blast furnace via the blow mold, d. H. the distributor head enables simple and advantageous distribution of the fuel dust onto the blow mold.

In weiterer Ausbildung der Erfindung besitzt deren Verteilerkopf höchstens 20 Austrittsöffnungen. Bei einer darüber hinausgehenden Zahl notwendiger Brennstaub-/Druckluftströmen, wie sie am Hochofen anfallen können, ist einem ersten Verteilerkopf mindestens ein weiterer Verteilerkopf nachgeschaltet. Vorzugsweise sind mindestens zwei Verteilerköpfe nachgeschaltet, aus denen gleiche Brennstaub-/ Druckluftströme abgezogen werden können.In a further embodiment of the invention, the distributor head has a maximum of 20 outlet openings. In the case of an additional number of necessary fuel dust / compressed air flows, such as can occur in the blast furnace, at least one further distributor head is connected downstream of a first distributor head. At least two distributor heads are preferably connected downstream, from which the same fuel dust / compressed air streams can be drawn off.

Für die Aufteilung des Brennstaub-/Druckluftgemisches in den Verteilerköpfen ist es von Vorteil, wenn die Austrittsöffnungen zur Einlaufströmungsachse des Verteilerkopfes parallel verlaufen und mit einem verstellbaren Ventilkegel versehen sind. Mit Hilfe des Ventilkegels kann die Öffnungsweite jeder Austrittsöffnung verändert und darüber der durch die Austrittsöffnung entweichende Mengenstrom geregelt werden.For the distribution of the fuel dust / compressed air mixture in the distributor heads, it is advantageous if the outlet openings run parallel to the inlet flow axis of the distributor head and are provided with an adjustable valve cone. With the help of the valve cone, the opening width of each outlet opening can be changed and the volume flow escaping through the outlet opening can be regulated.

Besonders günstige Strömungsverhältnisse ergeben sich bei Austrittsöffnungen, die auf einem Kreisumfang verteilt um die Einlaufströmungsöffnung herum angeordnet sind. Wahlweise ist dann mittig zwischen den Austrittsöffnungen noch ein Strömungskörper, z. B. in Form eines Kegels, vorgesehen, der zur Aufteilung des anströmenden Brennstaub-/Druckluftgemisches beiträgt.Particularly favorable flow conditions arise in the case of outlet openings which are arranged distributed over a circular circumference around the inlet flow opening. Optionally, there is a flow body in the middle between the outlet openings, e.g. B. in the form of a cone, which contributes to the distribution of the incoming fuel / compressed air mixture.

Von besonderem Vorteil ist auch eine erfindungsgemäße Ausbildung der Ventilkegel als Injektoren. Über diese Injektoren läßt sich zusätzlich Druckluft und/oder sogar zusätzlich Brennstaub eindosieren, so daß mit Hilfe der Injektoren eine individuelle Beeinflussung bzw. zusätzliche Regelbarkeit der einzelnen Austrittsströmungen des Verteilerkopfes gegeben ist. Konstruktiv werden die verstellbaren Ventilkegel wahlweise dadurch mit einer in Längsrichtung verschiebbaren Anordnung im Verteilergehäuse und einer Stelleinrichtung verwirklicht. Aus den Ventil kegeln entstehen durch die Anbringung von Durchtrittsöffnungen und die Beaufschlagung mit Druckluft und/oder Brennstaub Injektoren.An embodiment of the valve cone according to the invention as injectors is also particularly advantageous. Compressed air and / or even additional fuel dust can be metered in via these injectors, so that with the help of the injectors an individual influencing or additional controllability of the individual outlet flows is given to the distributor head. In terms of construction, the adjustable valve cones are optionally realized with an arrangement in the distributor housing which can be displaced in the longitudinal direction and an actuating device. From the valve cones, injectors are created by making openings and applying compressed air and / or fuel dust.

In der Zeichnung sind zwei Ausführungsbeispiele der Erfindung dargestellt. Es zeigen:

  • Fig. 1 einen Verteilerkopf mit gleichbleibenden Austrittsöffnungen;
  • Fig. 2 einen Verteilerkopf mit veränderbaren Austrittsöffnungen.
Two exemplary embodiments of the invention are shown in the drawing. Show it:
  • 1 shows a distributor head with constant outlet openings;
  • Fig. 2 shows a distributor head with changeable outlet openings.

Nach Fig. 1 ist der Verteilerkopf mehrteilig ausgebildet. In dem Trichterteil 1 mit der Einströmöffnung 2 tritt eine Verlangsamung des vom Düsenförderer herangetragenen Brennstaub-/Druckluftgemisches ein. Zugleich vergrößert sich der Querschnitt des Brennstaub-/Druckluftstromes, so daß alle im Austragteil 3 angeordneten Düsen 4 gleichmäßig mit Brennstaub/Druckluft beaufschlagt werden. Im Ausführungsbeispiel sind nur zwei einer Vielzahl gleichmäßig verteilt angeordneter Düsen 4 dargestellt. Die Düsen 4 bilden die Austragsöffnungen des Verteilerkopfes. Die Düsen 4 sind in dem Austragteil 3 verschraubt. An die Düsen 4 sind Leitungen 5 angeschlossen, die das austretende Brennstaub-/Druckluftgemisch dem jeweils gewünschten Verwendungszweck zuführen.1, the distributor head is formed in several parts. In the funnel part 1 with the inflow opening 2, the fuel dust / compressed air mixture carried by the nozzle conveyor slows down. At the same time, the cross section of the fuel dust / compressed air flow increases, so that all the nozzles 4 arranged in the discharge part 3 are evenly charged with fuel dust / compressed air. In the exemplary embodiment, only two of a plurality of nozzles 4 arranged in a uniformly distributed manner are shown. The nozzles 4 form the discharge openings of the distributor head. The nozzles 4 are screwed into the discharge part 3. Lines 5 are connected to the nozzles 4 and feed the escaping fuel dust / compressed air mixture to the desired intended use.

Nach Fig. 2 hat der Verteilerkopf eine im wesentlichen zylindrische Form. Er besteht aus einem Eintragteil 6 und einem Austragteil 7. Beide Teile 6 und 7 sind wie die Teile 1 und 3 nach Fig. 1 miteinander verbunden. Der Eintragteil 6 ist mit einem konischen Eintrittsstutzen 8 versehen, an den die Zuführungsleitung 12 des Düsenförderers angeschlossen ist.2, the distributor head has a substantially cylindrical shape. It consists of an entry part 6 and a discharge part 7. Both parts 6 and 7 are connected to one another like parts 1 and 3 according to FIG. 1. The entry part 6 is provided with a conical inlet connection 8, to which the feed line 12 of the nozzle conveyor is connected.

Der Austragteil 7 besitzt einen zentrisch angeordneten Strömungskörper in Form eines Kegels 9. Um den Kegel 9 herum sind auf einem Kreisumfang Austrittsöffnungen angeordnet, die wiederum durch Düsen 10 gebildet werden. Die Düsen 10 sind gleichmäßig verteilt angeordnet und - wie die Düsen 4 im Austragteil 3 der Fig. 1 - im Austragteil 7 verschraubt. An die Düsen 10 sind ebenfalls wie nach Fig. 1 Leitungen 5 angeschlossen, die das austretende Brennstaub/Druckluftgemisch dem gewünschten Verwendungszweck zuführen.The discharge part 7 has a centrally arranged flow body in the form of a cone 9. Around the cone 9 are on a Circumference of outlet openings arranged, which in turn are formed by nozzles 10. The nozzles 10 are arranged evenly distributed and - like the nozzles 4 in the discharge part 3 of FIG. 1 - screwed into the discharge part 7. Lines 5 are also connected to the nozzles 10, as shown in FIG. 1, which feed the escaping fuel dust / compressed air mixture to the desired use.

Mit den Düsen 10 wirken die Ventilkegel 11 zusammen. Die Ventilkegel 11 sind verschiebbar im Eintrittsteil 6 angeordnet, und zwar in paralleler Anordnung zur Längsachse 12 des Verteilerkopfes. Dabei gewährleisten Stopfbuchsen 13 eine ausreichende Abdichtung.The valve cones 11 interact with the nozzles 10. The valve cone 11 are slidably arranged in the inlet part 6, in a parallel arrangement to the longitudinal axis 12 of the distributor head. Here, glands 13 ensure adequate sealing.

Die Ventilkegel 11 sind mehrteilig ausgebildet und bestehen aus einer Spitze mit einer Durchtrittsöffnung 14 sowie einer Verstelleinrichtung und einer Brennstaub- und/oder Druckluftzuführung. Die Durchtrittsöffnung 14 ist mehrstufig, d. h., sie ist so weit wie möglich aufgebohrt, um die Strömungswiderstände minimal zu halten. Das Aufbohren erfolgt stufenweise.The valve cones 11 are formed in several parts and consist of a tip with a passage opening 14 as well as an adjusting device and a fuel dust and / or compressed air supply. The passage opening 14 is multi-stage, i. that is, it is drilled out as much as possible to keep flow resistances to a minimum. Drilling is done in stages.

Mit dem Ventilkegel 11 ist eine Hülse 15 verschraubt, die an dem dem Ventilkegel 11 abgewandten Ende verschlossen ist und zur Handverstellung ein Blech 16 und einen Griff 17 aufweist. Das Blech 16 besitzt ein Langloch 18, in dem die dargestellte Sechskantschraube sitzt. Die Schraube ist in einem Ring 19 verschraubt und dient zur Arretierung des Bleches 16 in der jeweils gewünschten Stellung. Der Ring 19 ist an dem Rohr 12 befestigt.A sleeve 15 is screwed to the valve cone 11, which is closed at the end facing away from the valve cone 11 and has a sheet 16 and a handle 17 for manual adjustment. The sheet 16 has an elongated hole 18 in which the hexagon screw shown sits. The screw is screwed into a ring 19 and serves to lock the sheet 16 in the desired position. The ring 19 is attached to the tube 12.

Mit der Hülse 15 ist ein Rohr 20 verschweißt, das mit einer Stange 21 einerseits als Führung und andererseits als Druck1uft-/Brenn- staubzuführung und/oder Meßeinrichtung dient. Die Stange 21 ist im Verteilerkopf verschiebbar angeordnet.A tube 20 is welded to the sleeve 15 and serves with a rod 21 on the one hand as a guide and on the other hand as a compressed air / fuel dust supply and / or measuring device. The rod 21 is arranged displaceably in the distributor head.

Zur Messung ist ein Manometer 22 an das Rohr 20 angeschlossen. Mit dem Manometer 22 wird der Luftdruck vor dem Ventilkegel 11 gemessen.A manometer 22 is connected to the tube 20 for measurement. The air pressure upstream of the valve plug 11 is measured with the pressure gauge 22.

Die Druckluftzuführung erfolgt vorzugsweise über eine nicht darge- stellte Leitung, die bei 23 an das Rohr 20 angeschlossen ist.The compressed air feed is preferably done via a non Darge - turned conduit which is connected to the pipe 20 at the 23rd

Bei den Ausführungsbeispielen nach Fig. 1 und 2 sind die Durchmesser der Düsen 4 und 10 jeweils so gewählt, daß in Abhängigkeit von dem zu transportierenden Material und der mit dem Düsenförderer zu überbrückenden Entfernung vom Brennstaubbehälter zur Einsatzstelle ein bestimmter Unterdruck oberhalb des Düsenförderers entsteht. Das gilt vorzugsweise für den Einsatz der Dosiervorrichtung bei Kohlenstaubbrennern.In the exemplary embodiments according to FIGS. 1 and 2, the diameters of the nozzles 4 and 10 are each selected such that a certain negative pressure arises above the nozzle conveyor depending on the material to be transported and the distance from the fuel dust container to the point of use to be bridged by the nozzle conveyor. This preferably applies to the use of the dosing device in coal dust burners.

Beim Einsatz eines Verteilerkopfes nach Fig. 2 werden die Ventilkegel 11 so eingestellt, daß Überdruck am Manometer 22 angezeigt wird.When using a distributor head according to FIG. 2, the valve cone 11 is set so that overpressure is displayed on the pressure gauge 22.

Die Geschwindigkeiten im Düsenförderer betragen insbesondere für den Einsatz bei Kohlenstaubbrennern 10 - 24 m/sec. Die Förderentfernung ist in den Ausführungsbeispielen nach Fig. 1 und 2 maximal 50 m, die Förderleistung beträgt maximal 5 t Brennstaub pro Stunde. Die Zahl der Injektordüsen ist in den Ausführungsbeispielen nach Fig. 1 und 2 mindestens 3 und maximal 20 je Verteilerkopf.The speeds in the nozzle conveyor are 10 - 24 m / sec, especially for use with coal dust burners. The conveying distance in the exemplary embodiments according to FIGS. 1 and 2 is a maximum of 50 m, the conveying capacity is a maximum of 5 t of fuel dust per hour. In the exemplary embodiments according to FIGS. 1 and 2, the number of injector nozzles is at least 3 and a maximum of 20 per distributor head.

Claims (8)

1. Staubeintrag in eine heiße Zone, insbesondere Kohlenstaubbrenner für Warmwasser- oder Dampfkessel oder Heißgaserzeuger mit einer Staubdosierung, dadurch gekennzeichnet, daß die Staubdosierung aus einem Düsenförderer mit Verteilerkopf und mindestens zwei Austrittsöffnungen (4, 10) besteht.1. Dust entry into a hot zone, in particular coal dust burners for hot water or steam boilers or hot gas generators with a dust metering, characterized in that the dust metering consists of a nozzle conveyor with a distributor head and at least two outlet openings (4, 10). 2. Staubeintrag nach Anspruch 1, dadurch gekennzeichnet, daß höchstens 20 Austrittsöffnungen (4, 10) in jedem Verteilerkopf vorgesehen sind.2. Dust entry according to claim 1, characterized in that a maximum of 20 outlet openings (4, 10) are provided in each distributor head. 3. Staubeintrag nach Anspruch 2, dadurch gekennzeichnet, daß einem Verteilerkopf mindestens ein weiterer nachgeschaltet ist.3. Dust entry according to claim 2, characterized in that at least one further distributor head is connected downstream. 4. Staubeintrag nach einem oder mehreren der Ansprüche 1-3, dadurch gekennzeichnet, daß die Austrittsöffnungen (4 und 10) parallel verlaufen und mit einem verstellbaren Ventilkegel (11) versehen sind.4. Dust entry according to one or more of claims 1-3, characterized in that the outlet openings (4 and 10) run parallel and are provided with an adjustable valve cone (11). 5. Staubeintrag nach Anspruch 4, dadurch gekennzeichnet, daß die Austrittsöffnungen (4, 10) auf einem Kreisumfang angeordnet sind.5. Dust entry according to claim 4, characterized in that the outlet openings (4, 10) are arranged on a circumference. 6. Staubeintrag nach Anspruch 4 oder 5, dadurch gekennzeichnet, daß der Ventilkegel (11) zugleich als Injektor ausgebildet ist.6. Dust entry according to claim 4 or 5, characterized in that the valve cone (11) is also designed as an injector. 7. Staubeintrag nach einem oder mehreren der Ansprüche 4 - 6, dadurch gekennzeichnet, daß der Ventilkegel (11) in Längsrichtung verschiebbar, im Verteilergehäuse angeordnet und mit einer Stelleinrichtung versehen ist.7. Dust entry according to one or more of claims 4-6, characterized in that the valve cone (11) is displaceable in the longitudinal direction, arranged in the distributor housing and provided with an adjusting device. 8. Staubeintrag nach Anspruch 7, dadurch gekennzeichnet, daß der Ventilkegel (11) eine Durchtrittsöffnung (14) und eine Druckluftzuführung aufweist,8. Dust entry according to claim 7, characterized in that the valve cone (11) has a passage opening (14) and a compressed air supply,
EP84110743A 1983-10-19 1984-09-08 Dust introduction into a hot zone Expired EP0140075B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84110743T ATE31360T1 (en) 1983-10-19 1984-09-08 DUST ENTRY IN A HOT ZONE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833337972 DE3337972A1 (en) 1983-10-19 1983-10-19 CARBON DUST BURNER
DE3337972 1983-10-19

Publications (3)

Publication Number Publication Date
EP0140075A2 true EP0140075A2 (en) 1985-05-08
EP0140075A3 EP0140075A3 (en) 1985-09-25
EP0140075B1 EP0140075B1 (en) 1987-12-09

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EP84110743A Expired EP0140075B1 (en) 1983-10-19 1984-09-08 Dust introduction into a hot zone

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EP (1) EP0140075B1 (en)
AT (1) ATE31360T1 (en)
DE (2) DE3337972A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0211295A1 (en) * 1985-08-05 1987-02-25 Paul Wurth S.A. Method and apparatus for pneumatically injecting dosed pulverized solid material into a changing-pressure reactor
DE3612682A1 (en) * 1986-04-15 1987-10-22 Krupp Polysius Ag Burner arrangement
WO2012034573A1 (en) * 2010-09-16 2012-03-22 Loesche Gmbh Solid-fuel-fired hot gas generator having an extended control range

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR648588A (en) * 1927-02-15 1928-12-11 Method and device for distributing the atomized fuel in two or more conduits
DE562321C (en) * 1930-07-10 1932-10-24 Andre Labat Camy Device for distributing dust-like material to a conveying gas which continues it through a conveying line
US1943376A (en) * 1931-06-04 1934-01-16 Dilling Harvey Newell Stoker for pulverized fuel
FR790009A (en) * 1935-05-06 1935-11-12 Iron Fireman Mfg Co Automatic loader for boilers
DE1128808B (en) * 1957-11-21 1962-04-26 Simon Ltd Henry Pneumatic conveyor system
GB1310886A (en) * 1969-11-25 1973-03-21 Coal Industry Patents Ltd Apparatus for distributing particulate material
US4250816A (en) * 1976-12-16 1981-02-17 Pullman Incorporated, Pullman Swindell Division Particulate solid fuel combustion system

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR648588A (en) * 1927-02-15 1928-12-11 Method and device for distributing the atomized fuel in two or more conduits
DE562321C (en) * 1930-07-10 1932-10-24 Andre Labat Camy Device for distributing dust-like material to a conveying gas which continues it through a conveying line
US1943376A (en) * 1931-06-04 1934-01-16 Dilling Harvey Newell Stoker for pulverized fuel
FR790009A (en) * 1935-05-06 1935-11-12 Iron Fireman Mfg Co Automatic loader for boilers
DE1128808B (en) * 1957-11-21 1962-04-26 Simon Ltd Henry Pneumatic conveyor system
GB1310886A (en) * 1969-11-25 1973-03-21 Coal Industry Patents Ltd Apparatus for distributing particulate material
US4250816A (en) * 1976-12-16 1981-02-17 Pullman Incorporated, Pullman Swindell Division Particulate solid fuel combustion system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0211295A1 (en) * 1985-08-05 1987-02-25 Paul Wurth S.A. Method and apparatus for pneumatically injecting dosed pulverized solid material into a changing-pressure reactor
DE3612682A1 (en) * 1986-04-15 1987-10-22 Krupp Polysius Ag Burner arrangement
WO2012034573A1 (en) * 2010-09-16 2012-03-22 Loesche Gmbh Solid-fuel-fired hot gas generator having an extended control range

Also Published As

Publication number Publication date
DE3468070D1 (en) 1988-01-21
EP0140075B1 (en) 1987-12-09
DE3337972A1 (en) 1985-05-09
ATE31360T1 (en) 1987-12-15
EP0140075A3 (en) 1985-09-25

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