EP2242949A2 - Method for mechanical stoking in firing installations and firing installation - Google Patents

Method for mechanical stoking in firing installations and firing installation

Info

Publication number
EP2242949A2
EP2242949A2 EP09711622A EP09711622A EP2242949A2 EP 2242949 A2 EP2242949 A2 EP 2242949A2 EP 09711622 A EP09711622 A EP 09711622A EP 09711622 A EP09711622 A EP 09711622A EP 2242949 A2 EP2242949 A2 EP 2242949A2
Authority
EP
European Patent Office
Prior art keywords
grate
fuel
firebox
furnace
feeder
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
EP09711622A
Other languages
German (de)
French (fr)
Other versions
EP2242949B1 (en
Inventor
Dietmar Baumann
Wolfgang Madlsperger
Willibald Weiss
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Christof International Management GmbH
Original Assignee
Siemens AG Oesterreich
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens AG Oesterreich filed Critical Siemens AG Oesterreich
Publication of EP2242949A2 publication Critical patent/EP2242949A2/en
Application granted granted Critical
Publication of EP2242949B1 publication Critical patent/EP2242949B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • F23K3/16—Over-feed arrangements
    • F23K3/18—Spreader stokers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23B—METHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL
    • F23B40/00—Combustion apparatus with driven means for feeding fuel into the combustion chamber
    • F23B40/02—Combustion apparatus with driven means for feeding fuel into the combustion chamber the fuel being fed by scattering over the fuel-supporting surface

Definitions

  • the invention relates to a method for litter feeding in furnaces, in which fuel is applied by means of a litter feeder to a grate arranged in the furnace, wherein the throw direction of the conveying direction of the grate is directed opposite, and a corresponding furnace.
  • the invention can be used in furnaces with blower throw litter.
  • the solid, small-particle fuel is introduced into the furnace with the aid of the centrifugal wheel arranged in the throw feeder. By changing the speed of the blast wheel the throw distance can be adjusted.
  • Corresponding systems are known, for example, from DE4217070A1, where coal is applied to a horizontal grate by means of litter feeding.
  • the throw feeder is mounted approximately vertically above the end of the grate in the end wall of the furnace.
  • the arrangement of the throwing feeder over the end of the grate has the disadvantage that fresh fuel also impinges on the grate near the end of the grate and can no longer completely burn before discharge. As a result, the maximum permissible residual carbon content of the ash may not be complied with.
  • An object of the invention is now to reduce the residual carbon content of the ash and also to achieve a reduction in the speed of the throwing feeder.
  • the object is achieved by a method according to claim 1, according to which the fuel is introduced directly under the furnace ceiling, in the conveying direction of the rust seen before the end of the grate, so that the grid between the throw feeder and the end of the grate creates a burn-out, the is not supplied with fresh fuel. Due to the fact that the throw feeder is offset from the end of the grate in the direction of throwing, no fresh fuel can reach the last area of the grate before discharge, but only the fuel already in combustion is burned ready. As a result, a more complete combustion of the fuel is achieved, which causes a reduction in the residual carbon content of the ash.
  • the throwing feeder is additionally arranged higher, a greater throwing range can be achieved at the same speed of the throwing wheel, or the speed of the throwing wheel can be reduced while the throwing distance remains the same.
  • the blast wheel is arranged horizontally, that is, the axis of rotation of the blast wheel is vertical.
  • the fuel is introduced from above in the region of the hub of the blast wheel in the housing of the throwing feeder and then with the help of the blades of the blast wheel horizontally outwards and - promoted through openings of the throw feeder - in the furnace.
  • the axis of rotation of the blast wheel can also be tilted against the vertical.
  • a particularly simple embodiment of the invention provides that the upper part of the end wall of the firebox is offset by a lowered part of the firebox inwardly into the firebox and the fuel is introduced at the upper end of the upper end wall.
  • the firebox cover closes off the firebox at the top and has an opening for the flue gas to be exhausted.
  • the burn-out zone is between 15 and 40%, in particular between 20 and 40%, of the length of the grate.
  • a combustion plant according to the invention is specified in claim 6. This comprises at least one furnace, a grate arranged therein and a throw feeder with which fuel can be applied against the conveying direction of the grate on the grate.
  • the firing plant is characterized in that the fuel can be introduced by means of the litter feeder directly under the firebox ceiling, in the conveying direction of the rust seen before the end of the grate, so that when operating the litter feeder at the grate between the litter feeder and the end of the grate a burn-out zone is formed can not be charged with fresh fuel.
  • the burn-out zone is between 15 and 40%, in particular between 20 and 40%, the length of the grate.
  • a discharge is provided, with which the combustion residues can be withdrawn from the furnace, and / or that the grate is a feed grate.
  • a particularly simple embodiment of the firing system provides that the upper part of the end wall of the firebox is offset by a lowered part of the firebox ceiling inwards into the firebox and at the upper end of the upper end wall an opening for introducing the fuel is provided.
  • the figure shows schematically the combustion chamber 1 of a furnace in which a horizontal grate 2 is arranged, which promotes from left to right.
  • This feed grate consists of individual elements with bars aligned in the conveying direction (in this example, the bars have a length of 500mm), with only every second element moved back and forth.
  • the fuel 3 is fed from above a throw feeders 4 and conveyed by means of this in the combustion chamber 1.
  • the throw feeder 4 has a horizontally arranged impeller, so the axis of rotation of the impeller is vertical.
  • the fuel 3 is introduced from above in the region of the hub of the centrifugal wheel in the throw feeder 4 and then with the help of the blades of the centrifugal wheel horizontally outward and - promoted through openings of the throw feeder - in the furnace.
  • the axis of rotation of the blast wheel can also be tilted against the vertical.
  • the throw feeder 4 itself is arranged outside of the combustion chamber 1, the openings of the throwing feeder 4 open into an opening 6 of the combustion chamber 1, in such a way that the fuel can be deployed as close as possible below the furnace ceiling 5.
  • the falling curves of the fuel delivered into the combustion chamber are represented by curves 7.
  • the firebox ceiling 5 is lowered from the burn-up end of the firebox 1 to the opening 6 for the fuel, so that over this lowered part 5a of the firebox ceiling 5 the throw feeder 4 has room.
  • the opening 6 of the firebox is.
  • the lower end wall 13 of the combustion chamber 1 remains unchanged.
  • the end wall 8, 13 of the combustion chamber 1 are arranged vertically in this example.
  • the end wall 8, 13 could also be arranged obliquely in whole or in part, wherein the vertical component should predominate. As soon as the horizontal component predominates, ie the wall is inclined more than 45 ° to the vertical, this wall must already be assigned to the firebox ceiling 5.
  • the firebox cover 5 closes the combustion chamber 1 at the top and has an opening for the withdrawal of the flue gas 9.
  • a substantial part of the firebox ceiling is arranged horizontally in this example, this part here covers about half the length of the grate 5.
  • the firebox ceiling can also have any other shape, which depends on the particular application, in particular depends on the fuel. In other applications, for example, the opening for the withdrawal of the flue gas 9 may be larger or smaller.
  • the burn-out zone 10 is formed on the grate 5, into which directly from the grate
  • the burn-out zone 10 therefore extends at least from vertically below the opening 6, that is, the upper end wall 8, to the discharge-side end of the grate 5. In this embodiment, the burn-out zone is about one-sixth the length of the grate.
  • the fresh fuel 7 from the throw feeder 4 can only impinge in the remaining area 11 of the grate 5.
  • the combustion therefore begins in this region 1 1 and continues in the burn-out zone 10, until finally the ash 12 remaining at the end of the grate 5 is conveyed out of the combustion chamber 1 without afterburning.
  • a feed grate can also be used a traveling grate.
  • the rust does not have to be horizontal, but it can also be arranged slightly inclined, inclined by about 7 ° to the horizontal.
  • the grate can also be designed in stages.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Solid-Fuel Combustion (AREA)
  • Incineration Of Waste (AREA)
  • Gasification And Melting Of Waste (AREA)

Abstract

A method is disclosed for mechanical stoking in firing installations, in which fuel (3, 7) is applied using a mechanical stoker (4) to a grate (2), which is disposed in the firing chamber (1), wherein the mechanical stoker is oriented opposite the delivery direction of the grate (2), and a corresponding installation. The method is characterized in that the fuel (3, 7) is introduced directly below the firing chamber ceiling (5), viewed in the delivery direction of the grate (2) before the end of the grate, so that a burnout zone (10), which does not have fresh fuel (3, 7) applied thereto, is created on the grate (2) between the mechanical stoker (4) and the end of the grate (2). The residual carbon content of the ash can thus be decreased and a decrease of the rotational speed of the mechanical stoker can also be achieved.

Description

Verfahren zur Wurfbeschickung bei Feuerungsanlagen und Process for litter feeding in combustion plants and
Feuerungsanlagefurnace
Die Erfindung betrifft ein Verfahren zur Wurfbeschickung bei Feuerungsanlagen, bei welchem Brennstoff mittels eines Wurfbeschickers auf einen im Feuerraum angeordneten Rost aufgebracht wird, wobei die Wurfrichtung der Förderrichtung des Rosts entgegen gerichtet ist, sowie eine entsprechende Feuerungsanlage.The invention relates to a method for litter feeding in furnaces, in which fuel is applied by means of a litter feeder to a grate arranged in the furnace, wherein the throw direction of the conveying direction of the grate is directed opposite, and a corresponding furnace.
Die Erfindung kann bei Feuerungsanlagen mit Schleuderrad-Wurfbeschickung eingesetzt werden. Der feste, kleinteilige Brennstoff wird dabei mit Hilfe des im Wurfbeschicker angeordneten Schleuderrades in den Feuerraum eingebracht. Durch Änderung der Drehzahl des Schleuderrades kann die Wurfweite eingestellt werden.The invention can be used in furnaces with blower throw litter. The solid, small-particle fuel is introduced into the furnace with the aid of the centrifugal wheel arranged in the throw feeder. By changing the speed of the blast wheel the throw distance can be adjusted.
Entsprechende Anlagen sind etwa aus der DE4217070A1 bekannt, wo Kohle mittels Wurfbeschickung auf einen waagrechten Rost aufgebracht wird. Der Wurfbeschicker ist dabei in etwa senkrecht über dem Ende des Rosts in der Stirnwand des Feuerraums angebracht.Corresponding systems are known, for example, from DE4217070A1, where coal is applied to a horizontal grate by means of litter feeding. The throw feeder is mounted approximately vertically above the end of the grate in the end wall of the furnace.
Die Anordnung des Wurfbeschickers über dem Ende des Rosts hat den Nachteil, dass frischer Brennstoff auch nahe dem Ende des Rosts auf dem Rost auftrifft und vor dem Austragen nicht mehr vollständig verbrennen kann. Dadurch kann der maximal zulässige Restkohlenstoffgehalt der Asche möglicherweise nicht eingehalten werden.The arrangement of the throwing feeder over the end of the grate has the disadvantage that fresh fuel also impinges on the grate near the end of the grate and can no longer completely burn before discharge. As a result, the maximum permissible residual carbon content of the ash may not be complied with.
Außerdem ist für eine Wurfweite bis zum gegenüberliegenden Anfang des Rosts eine hohe Drehzahl des Wurfbeschickers notwendig.In addition, a high speed of the throwing feeder is necessary for a throw to the opposite beginning of the grate.
Eine Aufgabe der Erfindung ist es nun, den Restkohlenstoffgehalt der Asche zu verringern und auch eine Verringerung der Drehzahl des Wurfbeschickers zu erreichen.An object of the invention is now to reduce the residual carbon content of the ash and also to achieve a reduction in the speed of the throwing feeder.
Die Aufgabe wird durch ein Verfahren nach Anspruch 1 gelöst, gemäß welchem der Brennstoff unmittelbar unter der Feuerraumdecke eingebracht wird, und zwar in Förderrichtung des Rosts gesehen vor Ende des Rosts, sodass am Rost zwischen dem Wurfbeschicker und dem Ende des Rostes eine Ausbrandzone entsteht, die nicht mit frischem Brennstoff beaufschlagt wird. Dadurch, dass der Wurfbeschicker vom Ende des Rosts in Wurfrichtung versetzt wird, kann in den letzten Bereich des Rosts vor dem Austrag kein frischer Brennstoff mehr gelangen, sondern es wird nur der bereits in Verbrennung befindliche Brennstoff fertig verbrannt. Dadurch wird eine vollständigere Verbrennung des Brennstoffes erzielt, was eine Senkung des Restkohlenstoffgehalt der Asche bedingt.The object is achieved by a method according to claim 1, according to which the fuel is introduced directly under the furnace ceiling, in the conveying direction of the rust seen before the end of the grate, so that the grid between the throw feeder and the end of the grate creates a burn-out, the is not supplied with fresh fuel. Due to the fact that the throw feeder is offset from the end of the grate in the direction of throwing, no fresh fuel can reach the last area of the grate before discharge, but only the fuel already in combustion is burned ready. As a result, a more complete combustion of the fuel is achieved, which causes a reduction in the residual carbon content of the ash.
Dadurch, dass der Wurfbeschicker zusätzlich höher angeordnet wird, kann bei gleicher Drehzahl des Schleuderrades eine größere Wurfweite erzielt werden bzw. bei gleichbleibender Wurfweite die Drehzahl des Schleuderrades verringert werden.Due to the fact that the throwing feeder is additionally arranged higher, a greater throwing range can be achieved at the same speed of the throwing wheel, or the speed of the throwing wheel can be reduced while the throwing distance remains the same.
In der Regel ist dabei das Schleuderrad waagrecht angeordnet, also die Drehachse des Schleuderrads steht senkrecht. Der Brennstoff wird von oben im Bereich der Nabe des Schleuderrades in das Gehäuse des Wurfbeschickers eingebracht und dann mit Hilfe der Flügel des Schleuderrades waagrecht nach außen und - durch Öffnungen des Wurfbeschickers - in den Feuerraum gefördert. Selbstverständlich kann die Drehachse des Schleuderrads auch gegen die Senkrechte gekippt sein.As a rule, the blast wheel is arranged horizontally, that is, the axis of rotation of the blast wheel is vertical. The fuel is introduced from above in the region of the hub of the blast wheel in the housing of the throwing feeder and then with the help of the blades of the blast wheel horizontally outwards and - promoted through openings of the throw feeder - in the furnace. Of course, the axis of rotation of the blast wheel can also be tilted against the vertical.
Eine besonders einfache Ausführung der Erfindung sieht vor, dass der obere Teil der Stirnwand des Feuerraums durch einen abgesenkten Teil der Feuerraumdecke nach innen in den Feuerraum versetzt ist und der Brennstoff am oberen Ende der oberen Stirnwand eingebracht wird.A particularly simple embodiment of the invention provides that the upper part of the end wall of the firebox is offset by a lowered part of the firebox inwardly into the firebox and the fuel is introduced at the upper end of the upper end wall.
Die Feuerraumdecke schließt den Feuerraum an der Oberseite ab und weist eine Öffnung für den Abzug des Rauchgases auf.The firebox cover closes off the firebox at the top and has an opening for the flue gas to be exhausted.
Um einen besonders niedrigen Restkohlenstoffgehalt der Asche zu erreichen, kann vorgesehen werden, dass die Ausbrandzone zwischen 15 und 40%, insbesondere zwischen 20 und 40%, der Länge des Rostes beträgt.In order to achieve a particularly low residual carbon content of the ash, it can be provided that the burn-out zone is between 15 and 40%, in particular between 20 and 40%, of the length of the grate.
Aufgrund der fast oder ganz vollständigen Verbrennung am Rost gemäß dem erfindungsgemäßen Verfahren kann auf eine Nachverbrennung in einer nachgeschalteten Einrichtung verzichtet werden. Entsprechend kann daher vorgesehen sein, dass die Verbrennungsrückstände am Ende des Rostes aus dem Feuerraum abgezogen werden. Das erfindungsgemäße Verfahren kann insbesondere bei einem Vorschubrost zur Anwendung kommen. Anders als bei einem Wanderrost, wo sich der Rost selbst in Förderrichtung bewegt, bleiben z.B. die Stäbe des Rosts am Platz und werden nur hin- und herbewegt. Eine dem erfindungsgemäßen Verfahren entsprechende Feuerungsanlage ist in Anspruch 6 angeführt. Diese umfasst zumindest einen Feuerraum, einen darin angeordneten Rost sowie einen Wurfbeschicker, mit welchem Brennstoff entgegen der Förderrichtung des Rosts auf den Rost aufgebracht werden kann. Die Feuerungsanlage ist dadurch gekennzeichnet, dass der Brennstoff mittels des Wurfbeschickers unmittelbar unter der Feuerraumdecke eingebracht werden kann, und zwar in Förderrichtung des Rosts gesehen vor Ende des Rosts, sodass bei Betrieb des Wurfbeschickers am Rost zwischen Wurfbeschicker und Ende des Rostes eine Ausbrandzone entsteht, die nicht mit frischem Brennstoff beaufschlagt werden kann. Bei der Feuerungsanlage kann entsprechend dem erfindungsgemäßen Verfahren vorgesehen sein, dass die Ausbrandzone zwischen 15 und 40%, insbesondere zwischen 20 und 40%, der Länge des Rostes beträgt.Due to the almost or complete combustion at the grate according to the method according to the invention can be dispensed with afterburning in a downstream device. Accordingly, it can therefore be provided that the combustion residues are withdrawn from the furnace at the end of the grate. The method according to the invention can be used in particular for a feed grate. Unlike a traveling grate, where the grate itself moves in the conveying direction, eg the bars of the grate remain in place and are only moved back and forth. A combustion plant according to the invention is specified in claim 6. This comprises at least one furnace, a grate arranged therein and a throw feeder with which fuel can be applied against the conveying direction of the grate on the grate. The firing plant is characterized in that the fuel can be introduced by means of the litter feeder directly under the firebox ceiling, in the conveying direction of the rust seen before the end of the grate, so that when operating the litter feeder at the grate between the litter feeder and the end of the grate a burn-out zone is formed can not be charged with fresh fuel. In the firing plant can be provided according to the inventive method that the burn-out zone is between 15 and 40%, in particular between 20 and 40%, the length of the grate.
Ebenso, dass am Ende des Rostes ein Austrag vorgesehen ist, mit welchem die Verbrennungsrückstände aus dem Feuerraum abgezogen werden können, und/oder dass der Rost ein Vorschubrost ist.Likewise, that at the end of the grate a discharge is provided, with which the combustion residues can be withdrawn from the furnace, and / or that the grate is a feed grate.
Eine besonders einfache Ausführung der Feuerungsanlage sieht vor, dass der obere Teil der Stirnwand des Feuerraums durch einen abgesenkten Teil der Feuerraumdecke nach innen in den Feuerraum versetzt ist und am oberen Ende der oberen Stirnwand eine Öffnung zum Einbringen des Brennstoffs vorgesehen ist.A particularly simple embodiment of the firing system provides that the upper part of the end wall of the firebox is offset by a lowered part of the firebox ceiling inwards into the firebox and at the upper end of the upper end wall an opening for introducing the fuel is provided.
Ein Ausführungsbeispiel der Erfindung ist in der Figur dargestellt und wird im Folgenden erläutert.An embodiment of the invention is shown in the figure and will be explained below.
Die Figur zeigt schematisch den Feuerraum 1 einer Feuerungsanlage, in der waagrecht ein Rost 2 angeordnet ist, welcher von links nach rechts fördert. Dieser Vorschubrost besteht aus einzelnen Elementen mit in Förderrichtung ausgerichteten Stäben (in diesem Beispiel haben die Stäbe eine Länge von 500mm), wobei nur jedes zweite Element hin und her bewegt wird. Der Brennstoff 3 wird von oben einem Wurfbeschicker 4 zugeführt und mittels diesem in den Feuerraum 1 gefördert.The figure shows schematically the combustion chamber 1 of a furnace in which a horizontal grate 2 is arranged, which promotes from left to right. This feed grate consists of individual elements with bars aligned in the conveying direction (in this example, the bars have a length of 500mm), with only every second element moved back and forth. The fuel 3 is fed from above a throw feeders 4 and conveyed by means of this in the combustion chamber 1.
Der Wurfbeschicker 4 weist ein waagrecht angeordnetes Schleuderrad auf, also die Drehachse des Schleuderrads steht senkrecht. Der Brennstoff 3 wird von oben im Bereich der Nabe des Schleuderrades in den Wurfbeschicker 4 eingebracht und dann mit Hilfe der Flügel des Schleuderrades waagrecht nach außen und - durch Öffnungen des Wurfbeschickers - in den Feuerraum gefördert. Wie bereits vorher erwähnt kann die Drehachse des Schleuderrads auch gegen die Senkrechte gekippt sein.The throw feeder 4 has a horizontally arranged impeller, so the axis of rotation of the impeller is vertical. The fuel 3 is introduced from above in the region of the hub of the centrifugal wheel in the throw feeder 4 and then with the help of the blades of the centrifugal wheel horizontally outward and - promoted through openings of the throw feeder - in the furnace. As already mentioned before, the axis of rotation of the blast wheel can also be tilted against the vertical.
Der Wurfbeschicker 4 selbst ist dabei außerhalb des Feuerraums 1 angeordnet, die Öffnungen des Wurfbeschickers 4 münden in eine Öffnung 6 des Feuerraums 1 , und zwar so, dass der Brennstoff so knapp wie möglich unterhalb der Feuerraumdecke 5 ausgebracht werden kann. Die Fallkurven des in den Feuerraum geförderten Brennstoffes sind durch Kurven 7 dargestellt. Zu diesem Zweck ist die Feuerraumdecke 5 vom ausbrandseiten Ende des Feuerraums 1 her bis zur Öffnung 6 für den Brennstoff abgesenkt, sodass über diesem abgesenkten Teil 5a der Feuerraumdecke 5 der Wurfbeschicker 4 Platz hat. In der durch die Absenkung zu bildenden oberen Stirnwand 8 ist die Öffnung 6 des Feuerraums. Die untere Stirnwand 13 des Feuerraums 1 bleibt unverändert. Dabei sind in diesem Beispiel die Stirnwand 8, 13 des Feuerraums 1 senkrecht angeordnet. Die Stirnwand 8, 13 könnte aber auch ganz oder teilweise schräg angeordnet sein, wobei die senkrechte Komponente überwiegen sollte. Sobald die waagrechte Komponente überwiegt, also die Wand mehr als 45° gegen die Senkrechte geneigt ist, muss man diese Wand bereits der Feuerraumdecke 5 zuordnen.The throw feeder 4 itself is arranged outside of the combustion chamber 1, the openings of the throwing feeder 4 open into an opening 6 of the combustion chamber 1, in such a way that the fuel can be deployed as close as possible below the furnace ceiling 5. The falling curves of the fuel delivered into the combustion chamber are represented by curves 7. For this purpose, the firebox ceiling 5 is lowered from the burn-up end of the firebox 1 to the opening 6 for the fuel, so that over this lowered part 5a of the firebox ceiling 5 the throw feeder 4 has room. In the upper end wall 8 to be formed by the lowering, the opening 6 of the firebox is. The lower end wall 13 of the combustion chamber 1 remains unchanged. In this case, the end wall 8, 13 of the combustion chamber 1 are arranged vertically in this example. The end wall 8, 13 could also be arranged obliquely in whole or in part, wherein the vertical component should predominate. As soon as the horizontal component predominates, ie the wall is inclined more than 45 ° to the vertical, this wall must already be assigned to the firebox ceiling 5.
Die Feuerraumdecke 5 schließt den Feuerraum 1 an der Oberseite ab und weist eine Öffnung für den Abzug des Rauchgases 9 auf. Ein wesentlicher Teil der Feuerraumdecke ist in diesem Beispiel waagrecht angeordnet, dieser Teil umfasst hier etwa die halbe Länge des Rosts 5. Natürlich kann die Feuerraumdecke auch eine beliebige andere Form haben, die von der jeweiligen Anwendung, insbesondere vom Brennstoff, abhängt. Bei anderen Anwendungen kann etwa die Öffnung für den Abzug des Rauchgases 9 größer oder kleiner sein.The firebox cover 5 closes the combustion chamber 1 at the top and has an opening for the withdrawal of the flue gas 9. A substantial part of the firebox ceiling is arranged horizontally in this example, this part here covers about half the length of the grate 5. Of course, the firebox ceiling can also have any other shape, which depends on the particular application, in particular depends on the fuel. In other applications, for example, the opening for the withdrawal of the flue gas 9 may be larger or smaller.
Dadurch, dass die Öffnung 6 für den Brennstoff aus dem Wurfbeschicker 4 entgegen der Förderrichtung des Rosts 5 in den Feuerraum hineinversetzt wird, entsteht auf dem Rost 5 die Ausbrandzone 10, in welche direkt aus demDue to the fact that the opening 6 for the fuel from the throw feeder 4 is set counter to the conveying direction of the grate 5 into the firebox, the burn-out zone 10 is formed on the grate 5, into which directly from the grate
Wurfbeschicker 4 kein frischer Brennstoff 7 gelangen kann. Die Ausbrandzone 10 reicht daher zumindest von senkrecht unterhalb der Öffnung 6, also der oberen Stirnwand 8, bis zum austragseitigen Ende des Rosts 5. Die Ausbrandzone beträgt bei dieser Ausführung etwa ein Sechstel der Länge des Rostes. Der frische Brennstoff 7 aus dem Wurfbeschicker 4 kann nur im übrigen Bereich 11 des Rosts 5 auftreffen. Die Verbrennung beginnt also in diesem Bereich 1 1 und setzt sich in der Ausbrandzone 10 fort, bis schließlich die am Ende des Rosts 5 übrig bleibende Asche 12 ohne Nachverbrennung aus dem Feuerraum 1 gefördert wird. Statt einem Vorschubrost kann auch ein Wanderrost verwendet werden. Auch muss der Rost nicht waagrecht, sondern er kann auch leicht geneigt angeordnet sein, etwa um bis zu 7° gegen die Horizontale geneigt. Neben der hier beispielhaft gezeigten Ausführung kann der Rost auch in Stufen ausgeführt sein.Litter feeder 4 no fresh fuel 7 can get. The burn-out zone 10 therefore extends at least from vertically below the opening 6, that is, the upper end wall 8, to the discharge-side end of the grate 5. In this embodiment, the burn-out zone is about one-sixth the length of the grate. The fresh fuel 7 from the throw feeder 4 can only impinge in the remaining area 11 of the grate 5. The combustion therefore begins in this region 1 1 and continues in the burn-out zone 10, until finally the ash 12 remaining at the end of the grate 5 is conveyed out of the combustion chamber 1 without afterburning. Instead of a feed grate can also be used a traveling grate. Also, the rust does not have to be horizontal, but it can also be arranged slightly inclined, inclined by about 7 ° to the horizontal. In addition to the embodiment shown here by way of example, the grate can also be designed in stages.
Bezuαszeichen:Bezuαszeichen:
1 Feuerraum1 firebox
2 Rost2 rust
3 Zugeführter Brennstoff3 Fuel supplied
4 Wurfbeschicker4 litter feeders
5 Feuerraumdecke5 firebox ceiling
5a abgesenkter Teil der Feuerraumdecke 55a lowered part of the firebox ceiling 5
6 Öffnung des Feuerraums für Brennstoff6 Opening of the firebox for fuel
7 in den Feuerraum geförderter Brennstoff7 fuel pumped into the firebox
8 obere Stirnwand des Feuerraums8 upper end wall of the firebox
9 Rauchgas9 flue gas
10 Ausbrandzone Mit Brennstoff beaufschlagter Bereich Asche untere Stirnwand des Feuerraums 10 burn-out zone Fueled area ash lower end wall of the furnace

Claims

Patentansprüche claims
1. Verfahren zur Wurfbeschickung bei Feuerungsanlagen, bei welchem Brennstoff (3, 7) mittels eines Wurfbeschickers (4) auf einen im Feuerraum (1 ) angeordneten Rost (2) aufgebracht wird, wobei die Wurfrichtung der1. A method for throwing feed at combustion plants, wherein fuel (3, 7) by means of a throw feeder (4) on a in the furnace (1) arranged grate (2) is applied, wherein the throwing direction of
Förderrichtung des Rosts (2) entgegen gerichtet ist, dadurch gekennzeichnet, dass der Brennstoff (3, 7) unmittelbar unter der Feuerraumdecke (5) eingebracht wird, und zwar in Förderrichtung des Rosts (2) gesehen vor Ende des Rosts, sodass am Rost (2) zwischen dem Wurfbeschicker (4) und dem Ende des Rostes (2) eine Ausbrandzone (10) entsteht, die nicht mit frischem Brennstoff (3, 7) beaufschlagt wird.Conveying direction of the grate (2) is directed opposite, characterized in that the fuel (3, 7) is introduced immediately below the firebox ceiling (5), in the conveying direction of the grate (2) seen before the end of the grate, so that the grate ( 2) between the throw feeders (4) and the end of the grate (2) a burn-out zone (10) is formed, which is not supplied with fresh fuel (3, 7).
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass die2. The method according to claim 1, characterized in that the
Ausbrandzone (10) zwischen 15 und 40%, insbesondere zwischen 20 und 40%, der Länge des Rostes (2) beträgt. Ausbrandzone (10) between 15 and 40%, in particular between 20 and 40%, the length of the grate (2) is.
3. Verfahren nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, dass die Verbrennungsrückstände (12) am Ende des Rostes (2) aus dem Feuerraum (1 ) abgezogen werden.3. The method according to any one of claims 1 or 2, characterized in that the combustion residues (12) at the end of the grate (2) from the combustion chamber (1) are deducted.
4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass der Rost (2) ein Vorschubrost ist. 4. The method according to any one of claims 1 to 3, characterized in that the grate (2) is a feed grate.
5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der obere Teil der Stirnwand (8) des Feuerraums (1 ) durch einen abgesenkten Teil (5a) der Feuerraumdecke (5) nach innen in den Feuerraum versetzt ist und der Brennstoff (3, 7) am oberen Ende der oberen Stirnwand (8) eingebracht wird. 5. The method according to any one of claims 1 to 4, characterized in that the upper part of the end wall (8) of the firebox (1) is offset by a lowered part (5a) of the firebox ceiling (5) inwards into the firebox and the fuel (3, 7) at the upper end of the upper end wall (8) is introduced.
6. Feuerungsanlage zur Durchführung des Verfahrens nach einem der6. Furnace for carrying out the method according to one of
Ansprüche 1 bis 5, umfassend zumindest einen Feuerraum (1 ), einen darin angeordneten Rost (2) sowie einen Wurfbeschicker (4), mit welchem Brennstoff (3, 7) entgegen der Förderrichtung des Rosts auf den Rost (2) aufgebracht werden kann, dadurch gekennzeichnet, dass der Brennstoff (3, 7) mittels des Wurfbeschickers (4) unmittelbar unter der Feuerraumdecke (5) eingebracht werden kann, und zwar in Förderrichtung des Rosts (2) gesehen vor Ende des Rosts, sodass bei Betrieb des Wurfbeschickers (4) am Rost (2) zwischen Wurfbeschicker (4) und Ende des Rostes (2) eine Ausbrandzone (10) entsteht, die nicht mit frischem Brennstoff (3, 7) beaufschlagt werden kann.Claims 1 to 5, comprising at least one furnace (1), a grate (2) arranged therein and a throw feeder (4), with which fuel (3, 7) can be applied against the conveying direction of the grate on the grate (2), characterized in that the fuel (3, 7) by means of the throw feeder (4) immediately below Firebox cover (5) can be introduced, in the conveying direction of the grate (2) seen before the end of the grate, so that when operating the throw feeder (4) on the grate (2) between the throw feeder (4) and the end of the grate (2) a burn-out zone (10), which can not be supplied with fresh fuel (3, 7).
7. Feuerungsanlage nach Anspruch 6, dadurch gekennzeichnet, dass die7. Furnace according to claim 6, characterized in that the
Ausbrandzone (10) zwischen 15 und 40%, insbesondere zwischen 20 und 40%, der Länge des Rostes (2) beträgt.Ausbrandzone (10) between 15 and 40%, in particular between 20 and 40%, the length of the grate (2) is.
8. Feuerungsanlage nach einem der Ansprüche 6 oder 7, dadurch gekennzeichnet, dass am Ende des Rostes (2) ein Austrag vorgesehen ist, mit welchem die Verbrennungsrückstände (12) aus dem Feuerraum (1 ) abgezogen werden können.8. Furnace according to one of claims 6 or 7, characterized in that at the end of the grate (2) a discharge is provided, with which the combustion residues (12) from the combustion chamber (1) can be deducted.
9. Feuerungsanlage nach einem der Ansprüche 6 bis 8, dadurch gekennzeichnet, dass der Rost (2) ein Vorschubrost ist. 9. Furnace according to one of claims 6 to 8, characterized in that the grate (2) is a feed grate.
10. Feuerungsanlage nach einem der Ansprüche 6 bis 9, dadurch gekennzeichnet, dass der obere Teil der Stirnwand (8) des Feuerraums (1 ) durch einen abgesenkten Teil (5a) der Feuerraumdecke (5) nach innen in den Feuerraum versetzt ist und am oberen Ende der oberen Stirnwand (8) eine Öffnung (6) zum Einbringen des Brennstoffs (3, 7) vorgesehen ist. 10. Furnace according to one of claims 6 to 9, characterized in that the upper part of the end wall (8) of the firebox (1) by a lowered part (5a) of the firebox ceiling (5) is offset inwardly into the furnace and at the top End of the upper end wall (8) has an opening (6) for introducing the fuel (3, 7) is provided.
EP09711622.2A 2008-02-21 2009-02-12 Method for mechanical stoking in firing installations and firing installation Active EP2242949B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008010235A DE102008010235B4 (en) 2008-02-21 2008-02-21 Process for litter feeding in furnaces and firing plant
PCT/EP2009/051623 WO2009103655A2 (en) 2008-02-21 2009-02-12 Method for mechanical stoking in firing installations and firing installation

Publications (2)

Publication Number Publication Date
EP2242949A2 true EP2242949A2 (en) 2010-10-27
EP2242949B1 EP2242949B1 (en) 2018-11-14

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Application Number Title Priority Date Filing Date
EP09711622.2A Active EP2242949B1 (en) 2008-02-21 2009-02-12 Method for mechanical stoking in firing installations and firing installation

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US (1) US20100323310A1 (en)
EP (1) EP2242949B1 (en)
CN (1) CN101946125B (en)
CA (1) CA2716179A1 (en)
DE (1) DE102008010235B4 (en)
WO (1) WO2009103655A2 (en)

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Also Published As

Publication number Publication date
US20100323310A1 (en) 2010-12-23
CA2716179A1 (en) 2009-08-27
DE102008010235B4 (en) 2010-07-01
EP2242949B1 (en) 2018-11-14
CN101946125B (en) 2012-12-05
CN101946125A (en) 2011-01-12
WO2009103655A3 (en) 2010-02-25
WO2009103655A2 (en) 2009-08-27
DE102008010235A1 (en) 2009-09-17

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