EP1198685B1 - Furnace with air-cooled vibrating discharge conveyor - Google Patents

Furnace with air-cooled vibrating discharge conveyor Download PDF

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Publication number
EP1198685B1
EP1198685B1 EP00951463A EP00951463A EP1198685B1 EP 1198685 B1 EP1198685 B1 EP 1198685B1 EP 00951463 A EP00951463 A EP 00951463A EP 00951463 A EP00951463 A EP 00951463A EP 1198685 B1 EP1198685 B1 EP 1198685B1
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EP
European Patent Office
Prior art keywords
air
combustion chamber
cooling
furnace according
ash
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EP00951463A
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German (de)
French (fr)
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EP1198685A1 (en
Inventor
Wolfgang Benesch
Reinhold Terhaar
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Steag Energy Services GmbH
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Steag Encotec GmbH
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J1/00—Removing ash, clinker, or slag from combustion chambers
    • F23J1/02—Apparatus for removing ash, clinker, or slag from ash-pits, e.g. by employing trucks or conveyors, by employing suction devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2900/00—Special arrangements for conducting or purifying combustion fumes; Treatment of fumes or ashes
    • F23J2900/01002—Cooling of ashes from the combustion chamber by indirect heat exchangers
    • 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
    • F23L2900/00—Special arrangements for supplying or treating air or oxidant for combustion; Injecting inert gas, water or steam into the combustion chamber
    • F23L2900/15041—Preheating combustion air by recuperating heat from ashes

Definitions

  • the invention relates to a furnace according to the preamble of claim 1.
  • the combustion chamber ash that is extracted from the bottom of the combustion chamber falls at a temperature of 800 to 1200 ° C.
  • the combustion chamber ash was dropped into a water bath, from which it was removed using the conveyor.
  • the ash quality has changed so that the subsequent transport process was problematic due to the lack of drainage of the ash.
  • the well-known dry ash removal process is operated with a hard coal combustion, which is described in a prospectus of the United States company United Conveyor Corporation from 1997.
  • the ashes are collected on grates and released in batches into a vacuum transport system.
  • the invention has for its object to improve the cooling of the combustion chamber ashes and their handling and removal.
  • the furnace according to the invention has the features of claim 1.
  • Vibratory conveyors are extremely robust, which is of great importance with regard to the abrasive properties of the combustion chamber ash. In addition, they provide high conveying capacities and easily allow both discontinuous and continuous operation, i.e. a very variable and effective dry ash removal process.
  • vibratory bowl feeders can be combined with very effective air cooling.
  • the temperature of the combustion chamber ash can therefore be effective during removal, i.e. can be quickly reduced to low values.
  • the invention is applicable above all to hard coal furnaces, but also to other types of furnaces, for example brown coal furnaces, refuse furnaces etc.
  • the cooling air penetrates the ash deposited in the vibrating channel and can then reach the combustion chamber, where it is used as preheated combustion air.
  • the vibrating trough with lateral nozzle openings for the cooling air. This leads to a very intensive cooling of the top of the ash deposit in the vibrating channel and the newly falling ash particles.
  • preheated combustion air is created for the combustion chamber.
  • the discharge device with nozzle openings for the cooling air. The combustion chamber ash is therefore cooled in countercurrent before being thrown onto the vibratory conveyor, which leads to very intensive cooling and preheating of the combustion air.
  • cooling air as preheated combustion air in the lower area of the combustion chamber brings an additional one advantageous effect, namely afterburning of the combustion chamber ash. This improves the burnout of the fuel (hard coal) and reduces the amount of combustion chamber ash.
  • the negative pressure prevailing in the combustion chamber can be sufficient to draw the cooling air through the individual nozzles.
  • the negative pressure in the combustion chamber can be sufficient to suck the cooling air through the air box.
  • a blower is used, it is preferably the fresh air blower that supplies the combustion chamber with combustion air. Part of this combustion air is thus branched off as cooling air and introduced into the combustion chamber as preheated air, either directly or after being returned to the combustion air flow.
  • the discharge device is provided with an angled outlet and that the vibratory conveyor is arranged below the angled outlet.
  • This training makes a significant contribution to the cooling process, since the vibratory conveyor is not in the direct radiation area of the combustion chamber. This improves cooling or reduces the cooling capacity required. It also enables the use of less high quality materials.
  • the discharge device is provided with closure flaps, which offer the possibility of delivering the combustion chamber ash to the vibratory conveyor in batches. In many cases, however, you will prefer a continuous ash discharge.
  • the flaps then offer the possibility of temporarily storing the ashes if there are brief faults in the area of the vibratory conveyor or minor repair or maintenance work needs to be carried out. This eliminates the need to shut down the furnace.
  • the main field of application of the invention is hard coal firing in power plants for steam generation.
  • the furnace according to FIG. 1 has a combustion chamber 1, at the lower end of which a discharge device 2 for combustion chamber ash is arranged. Below the discharge device 2 there is an oscillating conveyor 3, the conveying direction of which is perpendicular to the plane of the drawing.
  • the discharge device 2 has an angled outlet 4, so that the vibratory conveyor 3 is arranged offset and is not in the direct radiation area of the combustion chamber 1.
  • the vibratory conveyor 3 is therefore thermally shielded. An arrangement that is not offset is equally possible.
  • the vibrating conveyor 3 has a vibrating trough 5 which is arranged in an air box 6. As indicated in FIG. 2, the air box 6 is pressurized with compressed air, specifically via a line 7 which branches off from a combustion air line 8. The air flows under the vibrating trough 5 and causes indirect cooling of the ashes transported in the vibrating trough. To improve the heat transfer, the underside of the vibrating channel 5 is covered with cooling fins 9.
  • the air conveyed through the air box 6 is input as preheated combustion air into the furnace 1, in the present case via a separate line 10.
  • the preheated combustion air can also be conveyed back into the combustion air line 8 and from there directly or via the burners into the Reach the combustion chamber.
  • the vibratory conveyor 3 works with direct cooling.
  • 5 nozzle openings 12 are provided in the bottom of the vibrating trough, which blow the cooling air through the removed ashes.
  • Further nozzle openings 13 are provided in the side walls of the vibrating trough 5 in order to inflate cooling air onto the top of the ash and at the same time to cool falling ash particles.
  • FIG. 1 also shows that the discharge device also has two nozzle openings 14. These cool the falling ash particles in countercurrent, so in a very effective manner, and also cause the ashes to be burned again, which leads to a minimization of the amount of ash. Additional cooling air openings can be assigned to the furnace or the steam generator.
  • FIG. 1 shows that the discharge device 2 is provided with closure flaps 15, of which the left one is shown for clarification and the right one is shown semi-closed.
  • the closure flaps 15 permit discontinuous operation and, in the case of continuous operation, enable the short-term elimination of faults in the area of the vibrating conveyor without it being necessary to shut down the boiler system.
  • indirect cooling can be combined with direct cooling.
  • separate cooling air blowers can be used. It may be possible to dispense with any fan support if the vacuum in the furnace is sufficient to draw in the cooling air.
  • a blower support has the advantage, however, that the correspondingly high flow velocity in the nozzle openings can help prevent the nozzle openings from clogging.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gasification And Melting Of Waste (AREA)
  • Air Supply (AREA)

Abstract

The invention relates to a furnace with a body (1) of a furnace, at the lower end of which a discharge device (2) for the ashes produced in the combustion chamber is provided. A continuous conveyor device in the form of a vibrating conveyor (3) is mounted below the discharge device (2). The vibrating chute of said vibrating conveyor reliably and effectively removes the dry ashes which are at the same time cooled with air.

Description

Die Erfindung betrifft eine Feuerung nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a furnace according to the preamble of claim 1.

Die Brennkammer-Asche, die unten aus dem Feuerraum abgezogen wird, fällt mit einer Temperatur von 800 bis 1200°C an. Ursprünglich ließ man die Brennkammer-Asche in ein Wasserbad fallen, aus dem sie mittels des Förderers abgezogen wurde. Bei modernen NOx-armen Feuerungen hat sich die Aschequalität so verändert, daß der sich anschließende Transportprozeß aufgrund fehlender Entwässerbarkeit der Asche problematisch war. Außerdem ergaben sich Lagerungs- und Entsorgungsprobleme.The combustion chamber ash that is extracted from the bottom of the combustion chamber falls at a temperature of 800 to 1200 ° C. Originally, the combustion chamber ash was dropped into a water bath, from which it was removed using the conveyor. In modern low-NO x furnaces, the ash quality has changed so that the subsequent transport process was problematic due to the lack of drainage of the ash. There were also storage and disposal problems.

Vor diesem Hintergrund wurde ein Trockenentaschungsverfahren entwickelt, bei dem das Problem der Entwässerung der Brennkammer-Asche entfällt. Außerdem kann die trockene Asche besser wiederverwertet oder nach entsprechender Aufbereitung sogar der Filterasche zugemischt werden. Damit ergibt sich ein einheitlicher Entsorgungsweg für die gesamte Asche der Steinkohlefeuerung.Against this background, a dry ash removal process was developed in which the problem of dewatering the combustion chamber ash is eliminated. In addition, the dry ash can be better recycled or even mixed with the filter ash after appropriate treatment. This results in a uniform disposal route for the entire ash of the hard coal combustion.

Das bekannte Trockenentaschungsverfahren wird mit einer Steinkohlefeuerung betrieben, die in einem Prospekt der USamerikanischen Firma United Conveyor Corporation aus dem Jahre 1997 beschrieben ist. Die Asche wird auf Rosten gesammelt und chargenweise in ein Vakuum-Transportsystem abgegeben.The well-known dry ash removal process is operated with a hard coal combustion, which is described in a prospectus of the United States company United Conveyor Corporation from 1997. The ashes are collected on grates and released in batches into a vacuum transport system.

Ferner ist aus der WO 97/00406 eine Feuerung nach dem Oberbegriff des Patentanspruchs 1 bekannt, bei der die Trockenasche auf einen Metallbandförderer herabfällt, der in einem von Verbrennungsluft durchströmten Gehäuse arbeitet.Furthermore, from WO 97/00406 a furnace according to the preamble of claim 1 is known, in which the dry ash falls onto a metal belt conveyor which works in a housing through which combustion air flows.

Der Erfindung liegt die Aufgabe zugrunde, die Kühlung der Brennkammer-Asche sowie deren Handling und Abtransport zu verbessern.The invention has for its object to improve the cooling of the combustion chamber ashes and their handling and removal.

Zur Lösung dieser Aufgabe weist die erfindungsgemäße Feuerung die Merkmale des Patentanspruchs 1 auf.To achieve this object, the furnace according to the invention has the features of claim 1.

Schwingförderer sind äußerst robust, was im Hinblick auf die abrasiven Eigenschaften der Brennkammer-Asche von großer Bedeutung ist. Außerdem erbringen sie hohe Förderleistungen und gestatten ohne weiteres sowohl einen diskontinuierlichen als auch einen kontinuierlichen Betrieb, also ein sehr variables und wirksames Trockenentaschungsverfahren.Vibratory conveyors are extremely robust, which is of great importance with regard to the abrasive properties of the combustion chamber ash. In addition, they provide high conveying capacities and easily allow both discontinuous and continuous operation, i.e. a very variable and effective dry ash removal process.

Vor allen Dingen lassen sich Schwingförderer mit einer sehr effektiven Luftkühlung kombinieren. Die Temperatur der Brennkammer-Asche kann also während des Abtransports wirksam, d.h. rasch auf niedrige Werte abgesenkt werden.Above all, vibratory bowl feeders can be combined with very effective air cooling. The temperature of the combustion chamber ash can therefore be effective during removal, i.e. can be quickly reduced to low values.

Dabei ist hervorzuheben, daß die erfindungsgemäßen Mittel zum Transportieren und Kühlen der Brennkammer-Asche einfach, wirtschaftlich und zuverlässig im Betrieb sind.It should be emphasized that the means according to the invention for transporting and cooling the combustion chamber ash are simple, economical and reliable in operation.

Die Erfindung ist vor allen Dingen anwendbar auf Steinkohlefeuerungen, allerdings auch auf andersartige Feuerungen, beispielsweise Braunkohlefeuerungen, Müllfeuerungen etc.The invention is applicable above all to hard coal furnaces, but also to other types of furnaces, for example brown coal furnaces, refuse furnaces etc.

Die Kühlluft durchdringt die in der Schwingrinne abgelegte Asche und kann sodann in den Feuerraum gelangen, in welchem sie als vorgewärmte Verbrennungsluft genutzt wird. Zusätzlich dazu besteht die vorteilhafte Möglichkeit, die Schwingrinne mit seitlichen Düsenöffnungen für die Kühlluft zu versehen. Dies führt zu einer sehr intensiven Kühlung der Oberseite der Ascheablagerung in der Schwingrinne und der neu herabfallenden Aschepartikel. Auch hierbei entsteht vorgewärmte Verbrennungsluft für den Feuerraum. Schließlich besteht die Möglichkeit, auch die Austragvorrichtung mit Düsenöffnungen für die Kühlluft zu versehen. Die Brennkammer-Asche wird also bereits vor dem Abwerfen auf den Schwingförderer im Gegenstrom gekühlt, was zu einer sehr intensiven Kühlung und Vorwärmung der Verbrennungsluft führt.The cooling air penetrates the ash deposited in the vibrating channel and can then reach the combustion chamber, where it is used as preheated combustion air. In addition, there is the advantageous possibility of providing the vibrating trough with lateral nozzle openings for the cooling air. This leads to a very intensive cooling of the top of the ash deposit in the vibrating channel and the newly falling ash particles. Here too, preheated combustion air is created for the combustion chamber. Finally, it is also possible to provide the discharge device with nozzle openings for the cooling air. The combustion chamber ash is therefore cooled in countercurrent before being thrown onto the vibratory conveyor, which leads to very intensive cooling and preheating of the combustion air.

Das Eintragen von Kühlluft als vorgewärmte Verbrennungsluft in den unteren Bereich des Feuerraums bringt einen zusätzlichen vorteilhaften Effekt mit sich, nämlich eine Nachverbrennung der Brennkammer-Asche. Dies verbessert den Ausbrand des Brennstoffs (Steinkohle) und reduziert die anfallende Menge an Brennkammer-Asche.The introduction of cooling air as preheated combustion air in the lower area of the combustion chamber brings an additional one advantageous effect, namely afterburning of the combustion chamber ash. This improves the burnout of the fuel (hard coal) and reduces the amount of combustion chamber ash.

Je nach Betriebsbedingungen kann der im Feuerraum herrschende Unterdruck ausreichen, die Kühlluft durch die einzelnen Düsen hindurchzusaugen. Allerdings ist es ggf. auch von Vorteil, mindestens einige der Düsenöffnungen an ein Gebläse anzuschließen. Dies erhöht u.U. den Durchsatz an Kühlluft und führt vor allen Dingen zu einer besseren Steuerbarkeit des Kühlvorganges. Auch vermindert sich die Gefahr, daß sich die Düsenöffnungen zusetzen.Depending on the operating conditions, the negative pressure prevailing in the combustion chamber can be sufficient to draw the cooling air through the individual nozzles. However, it may also be advantageous to connect at least some of the nozzle openings to a blower. This may increase the throughput of cooling air and above all leads to better controllability of the cooling process. The risk of the nozzle openings becoming clogged is also reduced.

Neben der oben diskutierten direkten Kühlung der Brennkammer-Asche ergibt sich auch eine indirekte Kühlung. Die Kühlluft streicht nämlich im Luftkasten an der Unterseite der Schwingrinne vorbei und entzieht der Brennkammer-Asche Wärme, ohne mit letzterer in Berührung zu treten. Da der Luftkasten an den Feuerraum angeschlossen ist, entsteht zusätzliche vorgewärmte Verbrennungsluft.In addition to the direct cooling of the combustion chamber ash discussed above, there is also indirect cooling. The cooling air sweeps past the underside of the vibrating trough in the air box and extracts heat from the combustion chamber ashes without coming into contact with the latter. Since the air box is connected to the combustion chamber, additional preheated combustion air is created.

Für die indirekte Kühlung ist es vorteilhaft, die Unterseite der Schwingrinne mit Kühlrippen oder dergleichen zu versehen, um den Wärmeübergang in gesteuerter Weise zu steigern.For indirect cooling, it is advantageous to provide the underside of the vibrating channel with cooling fins or the like in order to increase the heat transfer in a controlled manner.

Der Unterdruck im Feuerraum kann ausreichen, die Kühlluft durch den Luftkasten hindurchzusaugen. Alternativ besteht, wie erwähnt, die Möglichkeit, den Luftkasten an ein Gebläse anzuschließen. Die diesbezüglichen Vorteile wurden bereits im Zusammenhang mit der direkten Kühlung angegeben.The negative pressure in the combustion chamber can be sufficient to suck the cooling air through the air box. Alternatively, as mentioned, there is the possibility of connecting the air box to a blower. The advantages in this regard have already been stated in connection with direct cooling.

Sofern ein Gebläse Anwendung findet, handelt es sich vorzugsweise um das Frischluftgebläse, welches den Feuerraum mit Verbrennungsluft versorgt. Ein Teil dieser verbrennungsluft wird also als Kühlluft abgezweigt und als vorgewärmte Luft in den Verbrennungsraum eingebracht, und zwar entweder direkt oder auch nach Rückführung in den Verbrennungsluftstrom.If a blower is used, it is preferably the fresh air blower that supplies the combustion chamber with combustion air. Part of this combustion air is thus branched off as cooling air and introduced into the combustion chamber as preheated air, either directly or after being returned to the combustion air flow.

In Weiterbildung der Erfindung wird vorgeschlagen, daß die Austragvorrichtung mit einem abgewinkelten Auslaß versehen ist und daß der Schwingförderer unterhalb des abgewinkelten Auslasses angeordnet ist. Diese Ausbildung leistet einen wesentlichen Beitrag zum Kühlungsprozeß, da sich der Schwingförderer nicht im direkten Strahlungsbereich des Feuerraumes befindet. Dies verbessert die Kühlung bzw. vermindert die erforderliche Kühlleistung. Außerdem ermöglicht es den Einsatz weniger hochwertiger Materialien.In a development of the invention it is proposed that the discharge device is provided with an angled outlet and that the vibratory conveyor is arranged below the angled outlet. This training makes a significant contribution to the cooling process, since the vibratory conveyor is not in the direct radiation area of the combustion chamber. This improves cooling or reduces the cooling capacity required. It also enables the use of less high quality materials.

Nach einem weiteren vorteilhaften Merkmal wird die Austragvorrichtung mit Verschlußklappen versehen, die die Möglichkeit bieten, die Brennkammer-Asche chargenweise an den Schwingförderer abzugeben. Vielfach wird man allerdings einen kontinuierlichen Ascheaustrag vorziehen. Hier bieten die Verschlußklappen dann die Möglichkeit, die Asche vorübergehend zu speichern, sofern im Bereich des Schwingförderers kurzzeitige Störungen auftreten bzw. kleinere Reparaturoder Wartungsarbeiten durchgeführt werden müssen. Dabei entfällt die Notwendigkeit, die Feuerung abzustellen.According to a further advantageous feature, the discharge device is provided with closure flaps, which offer the possibility of delivering the combustion chamber ash to the vibratory conveyor in batches. In many cases, however, you will prefer a continuous ash discharge. Here, the flaps then offer the possibility of temporarily storing the ashes if there are brief faults in the area of the vibratory conveyor or minor repair or maintenance work needs to be carried out. This eliminates the need to shut down the furnace.

Hauptanwendungsgebiet der Erfindung sind Steinkohlefeuerungen in Kraftwerksanlagen zur Dampferzeugung.The main field of application of the invention is hard coal firing in power plants for steam generation.

Die Erfindung wird im folgenden anhand bevorzugter Ausführungsbeispiele im Zusammenhang mit der beiliegenden Zeichnung näher erläutert. Die Zeichnung zeigt in:

  • Figur 1 in schematischer Darstellung einen Schnitt durch einen Dampferzeuger mit einer Steinkohlefeuerung;
  • Figur 2 eine Seitenansicht der Feuerung nach Figur 1;
  • Figur 3 einen Schnitt durch eine abgewandelte Ausführungsform eines Schwingförderers.
The invention is explained in more detail below on the basis of preferred exemplary embodiments in conjunction with the accompanying drawing. The drawing shows in:
  • Figure 1 is a schematic representation of a section through a steam generator with a hard coal firing;
  • Figure 2 is a side view of the furnace of Figure 1;
  • Figure 3 shows a section through a modified embodiment of a vibratory conveyor.

Die Feuerung nach Figur 1 weist einen Feuerraum 1 auf, an dessen unterem Ende eine Austragvorrichtung 2 für Brennkammer-Asche angeordnet ist. Unterhalb der Austragvorrichtung 2 befindet sich ein Schwingförderer 3, dessen Förderrichtung senkrecht zur Zeichenebene verläuft.The furnace according to FIG. 1 has a combustion chamber 1, at the lower end of which a discharge device 2 for combustion chamber ash is arranged. Below the discharge device 2 there is an oscillating conveyor 3, the conveying direction of which is perpendicular to the plane of the drawing.

Die Austragvorrichtung 2 weist einen abgewinkelten Auslaß 4 auf, so daß der Schwingförderer 3 versetzt angeordnet ist und nicht im direkten Strahlungsbereich des Feuerraums 1 liegt. Der Schwingförderer 3 ist also thermisch abgeschirmt. Eine nicht versetzte Anordnung ist gleichermaßen möglich.The discharge device 2 has an angled outlet 4, so that the vibratory conveyor 3 is arranged offset and is not in the direct radiation area of the combustion chamber 1. The vibratory conveyor 3 is therefore thermally shielded. An arrangement that is not offset is equally possible.

Der Schwingförderer 3 weist eine Schwingrinne 5 auf, die in einem Luftkasten 6 angeordnet ist. Wie in Figur 2 angedeutet, wird der Luftkasten 6 mit Druckluft beaufschlagt, und zwar über eine Leitung 7, die von einer Verbrennungsluftleitung 8 abzweigt. Die Luft strömt unter der Schwingrinne 5 entlang und bewirkt eine indirekte Kühlung der in der Schwingrinne transportieren Asche. Zur Verbesserung des Wärmeübergangs ist die Unterseite der Schwingrinne 5 mit Kühlrippen 9 besetzt.The vibrating conveyor 3 has a vibrating trough 5 which is arranged in an air box 6. As indicated in FIG. 2, the air box 6 is pressurized with compressed air, specifically via a line 7 which branches off from a combustion air line 8. The air flows under the vibrating trough 5 and causes indirect cooling of the ashes transported in the vibrating trough. To improve the heat transfer, the underside of the vibrating channel 5 is covered with cooling fins 9.

Die durch den Luftkasten 6 hindurchgeförderte Luft wird als vorgewärmte Verbrennungsluft in die Feuerung 1 eingegeben, und zwar im vorliegenden Fall über eine gesonderte Leitung 10. Alternativ kann die vorgewärmte Verbrennungsluft auch in die Verbrennungsluftleitung 8 zurückgefördert werden und von dort direkt oder über die Brenner in den Feuerraum gelangen.The air conveyed through the air box 6 is input as preheated combustion air into the furnace 1, in the present case via a separate line 10. Alternatively, the preheated combustion air can also be conveyed back into the combustion air line 8 and from there directly or via the burners into the Reach the combustion chamber.

Im Gegensatz zu der indirekten Kühlung der Asche nach den Figuren 1 und 2 arbeitet der Schwingförderer 3 nach Figur 3 mit direkter Kühlung. Hierzu sind im Boden der Schwingrinne 5 Düsenöffnungen 12 vorgesehen, die die Kühlluft durch die abtransportierte Asche hindurchblasen. Weitere Düsenöffnungen 13 sind in den Seitenwänden der Schwingrinne 5 vorgesehen, um Kühlluft auf die Oberseite der Asche aufzublasen und gleichzeitig herabfallende Aschepartikel zu kühlen.In contrast to the indirect cooling of the ashes according to FIGS. 1 and 2, the vibratory conveyor 3 according to FIG. 3 works with direct cooling. For this purpose, 5 nozzle openings 12 are provided in the bottom of the vibrating trough, which blow the cooling air through the removed ashes. Further nozzle openings 13 are provided in the side walls of the vibrating trough 5 in order to inflate cooling air onto the top of the ash and at the same time to cool falling ash particles.

Ferner zeigt Figur 1, daß auch die Austragvorrichtung 2 Düsenöffnungen 14 aufweist. Diese kühlen die herabfallenden Aschepartikel im Gegenstrom, also in sehr effektiver Weise, und bewirken ferner eine Nachverbrennung der Asche, was zu einer Minimierung der Aschemenge führt. Weitere Kühlluftöffnungen können der Feuerung oder dem Dampferzeuger zugeordnet sein.FIG. 1 also shows that the discharge device also has two nozzle openings 14. These cool the falling ash particles in countercurrent, so in a very effective manner, and also cause the ashes to be burned again, which leads to a minimization of the amount of ash. Additional cooling air openings can be assigned to the furnace or the steam generator.

Schließlich zeigt Figur 1, daß die Austragvorrichtung 2 mit Verschlußklappen 15 versehen ist, von denen zur Verdeutlichung die linke geschlossen und die rechte halbgeschlossen dargestellt ist. Die Verschlußklappen 15 lassen einen diskontinuierlichen Betrieb zu und ermöglichen bei kontinuierlichem Betrieb die kurzfristige Beseitigung von Störungen im Bereich des Schwingförderers, ohne daß es notwendig wäre, die Kesselanlage stillzusetzen.
Im Rahmen der Erfindung sind durchaus Abwandlungsmöglichkeiten gegeben. So läßt sich die indirekte mit der direkten Kühlung kombinieren. Ferner kann mit gesonderten Kühlluft-Gebläsen gearbeitet werden. Unter Umständen kann auf jegliche Gebläseunterstützung verzichtet werden, sofern der Unterdruck in der Feuerung zum Ansaugen der Kühlluft ausreicht. Eine Gebläseunterstützung hat allerdings den Vorteil, daß durch entsprechend hohe Strömungsgeschwindigkeit in den Düsenöffnungen dazu beigetragen werden kann, daß sich die Düsenöffnungen nicht zusetzen. Dies gilt auch für die im Bereich der Austragvorrichtung angeordneten Düsenöffnungen. Wird auf eine Gebläseunterstützung verzichtet, so kann bei der Ausführungsform nach Figur 3 der Luftkasten entfallen. Ggf. besteht ferner die Möglichkeit, an den Schwingförderer nach Figur 2 einen weiteren Schwingförderer anzuschließen, der ebenfalls mit einer Kühleinrichtung versehen wird, wobei die beiden Kühleinrichtungen durchaus unterschiedlich aufgebaut sein können.Finally, FIG. 1 shows that the discharge device 2 is provided with closure flaps 15, of which the left one is shown for clarification and the right one is shown semi-closed. The closure flaps 15 permit discontinuous operation and, in the case of continuous operation, enable the short-term elimination of faults in the area of the vibrating conveyor without it being necessary to shut down the boiler system.
In the context of the invention, there are quite a number of possible modifications. In this way, indirect cooling can be combined with direct cooling. Furthermore, separate cooling air blowers can be used. It may be possible to dispense with any fan support if the vacuum in the furnace is sufficient to draw in the cooling air. A blower support has the advantage, however, that the correspondingly high flow velocity in the nozzle openings can help prevent the nozzle openings from clogging. This also applies to the nozzle openings arranged in the area of the discharge device. If fan support is dispensed with, then the embodiment according to FIG. 3 the air box is omitted. Possibly. there is also the possibility of connecting a further vibratory conveyor to the vibratory conveyor according to FIG. 2, which is also provided with a cooling device, the two cooling devices being able to be constructed quite differently.

Claims (10)

  1. Furnace with a combustion chamber (1), at least one discharge device (2), which is arranged at the lower end of the combustion chamber (1), for dry combustion chamber ash, a continuous conveyor, which is arranged below the discharge device (2), for receiving and transporting away the discharged ash in dry state and a device for cooling the ash by means of air, wherein the cooling air is used as preheated combustion air for the combustion chamber (1), characterised in that the conveyor is constructed as a vibratory conveyor (3) and has a vibratory channel (5) open towards the discharge device (2), that the vibratory channel (5) forms the upper wall of an airbox (6) connected with the combustion chamber (1) and that the base of the vibratory channel (5) is provided with nozzle openings (12) for passage of the cooling air.
  2. Furnace according to claim 1, characterised in that the vibratory channel (5) is provided with lateral nozzle openings (13) for the cooling air.
  3. Furnace according to claim 1 or 2, characterised in that the discharge device (2) is provided with nozzle openings (14) for the cooling air.
  4. Furnace according to one of claims 1 to 3, characterised in that at least some of the nozzle openings (12 to 14) are connected with a fan.
  5. Furnace according to one of claims 1 to 4, characterised in that the underside of the vibratory channel (5) is provided with cooling ribs (9) or the like.
  6. Furnace according to one of claims 1 to 5, characterised in that the airbox (6) is connected with a fan.
  7. Furnace according to claim 6, characterised in that the fan is the combustion air fan.
  8. Furnace according to one of claims 1 to 7, characterised in that the cooling air is introduced into the combustion air flow as preheated combustion air.
  9. Furnace according to one of claims 1 to 8, characterised in that the discharge device (2) is provided with an angled outlet (4) and that the vibratory conveyor is arranged below the angled outlet (4).
  10. Furnace according to one of claims 1 to 9, characterised in that the discharge device (2) is provided with closure flaps (15).
EP00951463A 1999-08-03 2000-07-28 Furnace with air-cooled vibrating discharge conveyor Expired - Lifetime EP1198685B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19935597 1999-08-03
DE19935597A DE19935597C2 (en) 1999-08-03 1999-08-03 heating
PCT/EP2000/007262 WO2001009549A1 (en) 1999-08-03 2000-07-28 Furnace with air-cooled vibrating discharge conveyor

Publications (2)

Publication Number Publication Date
EP1198685A1 EP1198685A1 (en) 2002-04-24
EP1198685B1 true EP1198685B1 (en) 2004-03-31

Family

ID=7916449

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Application Number Title Priority Date Filing Date
EP00951463A Expired - Lifetime EP1198685B1 (en) 1999-08-03 2000-07-28 Furnace with air-cooled vibrating discharge conveyor

Country Status (9)

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US (1) US6745705B1 (en)
EP (1) EP1198685B1 (en)
CN (1) CN1153924C (en)
AT (1) ATE263338T1 (en)
DE (2) DE19935597C2 (en)
ES (1) ES2218195T3 (en)
PT (1) PT1198685E (en)
TR (1) TR200200230T2 (en)
WO (1) WO2001009549A1 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7559725B2 (en) * 2005-11-14 2009-07-14 General Kinematics Corporation Conveyor for and method of conveying heated material
KR100749754B1 (en) * 2006-08-01 2007-08-17 삼성전자주식회사 Encoding and decoding methods capable of controlling a direct current(dc), and data processing device using the same
US20090126219A1 (en) * 2007-11-19 2009-05-21 General Kinematics Corporation Method and System for Drying High-Moisture Content Plant Material
DE102010024020B4 (en) * 2010-06-16 2019-08-01 Clyde Bergemann Drycon Gmbh Conveying means and method for conveying hot material
US8826835B1 (en) 2011-01-18 2014-09-09 General Kinematics Corporation Controlling carbon content in conveyed heated material
US10088233B2 (en) 2013-01-31 2018-10-02 General Kinematics Corporation Vibratory dryer with mixing apparatus
CN104390347B (en) * 2014-10-17 2017-05-03 安徽明太生物科技有限公司 Energy-saving boiler system
CN116576476A (en) * 2023-07-11 2023-08-11 江苏大恒环境技术有限公司 Furnace bottom dry ash discharging device of furnace-pan integrated salt-containing waste liquid incinerator

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE311639C (en) * 1900-01-01
DE447081C (en) * 1926-02-10 1927-07-15 Spuelkraft A G Ash removal device for several connected boilers or boiler groups
ES8300995A1 (en) * 1980-06-10 1982-11-01 Parkinson Cowan Appliances Ltd Grates.
EP0055748A1 (en) * 1980-07-08 1982-07-14 JOHANSSON, Sjunne Means in furnace installations
US4503783A (en) * 1983-07-11 1985-03-12 General Kinematics Corporation Furnace ash air seal
GB8615634D0 (en) * 1986-06-26 1986-07-30 Incinerator Co Ltd Combustion apparatus
US4715763A (en) * 1986-07-25 1987-12-29 Smith & Mahoney, P.C. Dry ash removal system
US4901652A (en) * 1989-04-10 1990-02-20 John Zink Company Accumulating and conveying incinerator ash
IT1276747B1 (en) * 1995-06-19 1997-11-03 Magaldi Ricerche & Brevetti BULK MATERIALS EXTRACTOR / COOLER
DE19528765C2 (en) * 1995-08-04 1999-03-25 Siemens Ag Discharge device for a smoldering drum for waste
US5775237A (en) * 1996-12-30 1998-07-07 Florida Power Corporation Dry bottom ash handling system
IT1298162B1 (en) * 1998-01-15 1999-12-20 Magaldi Ricerche & Brevetti EQUIPMENT AND METHOD FOR THE AFTERBURNING OF BOTTOM ASH WITH HIGH UNBURNED CONTENT

Also Published As

Publication number Publication date
DE50005920D1 (en) 2004-05-06
CN1153924C (en) 2004-06-16
US6745705B1 (en) 2004-06-08
ATE263338T1 (en) 2004-04-15
PT1198685E (en) 2004-08-31
DE19935597A1 (en) 2001-02-15
EP1198685A1 (en) 2002-04-24
ES2218195T3 (en) 2004-11-16
CN1369047A (en) 2002-09-11
WO2001009549A1 (en) 2001-02-08
TR200200230T2 (en) 2002-08-21
DE19935597C2 (en) 2002-03-14

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