EP2306086A2 - Grate bar - Google Patents

Grate bar Download PDF

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Publication number
EP2306086A2
EP2306086A2 EP10008873A EP10008873A EP2306086A2 EP 2306086 A2 EP2306086 A2 EP 2306086A2 EP 10008873 A EP10008873 A EP 10008873A EP 10008873 A EP10008873 A EP 10008873A EP 2306086 A2 EP2306086 A2 EP 2306086A2
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EP
European Patent Office
Prior art keywords
grate bar
grate
bar according
upper side
wear plate
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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
EP10008873A
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German (de)
French (fr)
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EP2306086A3 (en
EP2306086B1 (en
Inventor
Jochen Poschlod
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Mitsubishi Power Europe GmbH
Original Assignee
ThyssenKrupp Xervon Energy GmbH
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Publication date
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Priority to PL10008873T priority Critical patent/PL2306086T3/en
Publication of EP2306086A2 publication Critical patent/EP2306086A2/en
Publication of EP2306086A3 publication Critical patent/EP2306086A3/en
Application granted granted Critical
Publication of EP2306086B1 publication Critical patent/EP2306086B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23H—GRATES; CLEANING OR RAKING GRATES
    • F23H3/00—Grates with hollow bars
    • F23H3/02—Grates with hollow bars internally cooled

Definitions

  • the present invention relates to a grate bar for placement in a grate of an incinerator.
  • combustion grate An important component of a combustion plant, such as a waste incineration plant for the thermal utilization of waste, is a combustion grate.
  • a combustion grate On such a combustion grate arranged horizontally or inclined in an incinerator, the combustible material travels from a first end to a second end, the first end being the feedstock for the kiln and the second end typically being referred to as a burnout grate on which the thermal conversion of the kiln concludes.
  • Combustion grates are nowadays usually constructed from a plurality of individual grate bars, which are joined together to form a corresponding combustion grate. This structure allows for easy replacement of individual grate bars in case of damage to individual areas of the grate.
  • the grate bars are usually set in rows next to each other, wherein the rows are arranged one above the other like a step, so that the rows partially overlap.
  • the individual rows are mutually displaceable to allow a transport of the fuel by a displacement of the overlapping grate bar rows against each other.
  • the grate bars used in such incinerators and of these Gratings formed must on the one hand have sufficient mechanical stability in order to be able to absorb and transport the firing material, and on the other hand they must have suitable high-temperature resistance in order to be able to withstand the temperatures occurring during the thermal conversion of the firing material.
  • the grate bars or gratings are flown from an underside with an air flow and have outlet openings, through which the incoming combustion air can pass into the kiln.
  • Such grates or grate bars are for example from the DE 20111804 U1 known.
  • the European patent specification EP 1 612 483 B1 discloses a corresponding grate bar for use in incinerators, which is flown from an underside with an air flow, wherein the grate bars shown here have air ducts over which the stream of air flowed from below is passed through the grate so that it lies on the lying in the feed direction longitudinal side of the Roststabes exit and there flows into the kiln.
  • a problem with the use of rust or grate bars in incinerators is the high-temperature corrosion occurring there.
  • High-temperature corrosion is a phenomenon similar to wet corrosion, but in this case corrosion is not caused by aqueous media, but rather by reactions of the material with the kiln or gaseous compounds produced during combustion.
  • halide-containing salts under the conditions prevailing in incinerators lead to the formation of volatile halides which attack the protective oxide layer formed on the material and thus lead to corrosion of the materials.
  • a grate bar for arrangement in a grate of a combustion plant, with an upper side, an end face, a rear longitudinal face and a lower face, wherein the upper face and end face merge into one another via an arc section, which is characterized in that at least below the arc section a wear plate is arranged.
  • the inventively provided wear plate is preferably arranged at a distance from the arc section on the inside of the grate bar.
  • a grate bar according to the invention may have on its upper side an outlet opening for gaseous media directed against the lower side, such as, for example, combustion air. Through this opening, the combustion air passes from the area below the grate bar in the firing rod located on the grate bar. As a result, combustion air is passed into the kiln in such a way that a sufficient supply of the combustion process with combustion air is ensured.
  • gaseous media directed against the lower side
  • the inventively provided wear plate may be attached to a central rib of the grate bar or be formed on this.
  • this is integrally formed, so that the wear plate is integrally formed on a central rib of the grate bar.
  • this can be cast, for example, from a suitable material.
  • the above-mentioned center rib may comprise support webs or cooling webs in a grate bar according to the invention, via which the center rib is supported relative to the upper side of the grate bar.
  • the support webs or cooling webs can fulfill air-conducting functions and ensure guidance of the air flow directed from below against the grate bar to the outlet opening arranged at the top of the grate bar.
  • a grate bar according to the invention can have recesses, in particular in the region of the center rib, via which a plurality of grate bars can be connected to one another.
  • connecting means for example connecting webs are suitable, which are insertable into the recesses.
  • a grate bar according to the invention can have a support section with which it can be placed on a holding bar.
  • the support rod serves at the same time as a pivot bearing, around which a rotation of the grate bar is made possible when moving superposed, individual grate sections forming grate bars.
  • this has a support section both in the front region of the grate bar and in the rear region. This makes it possible to turn the grate bar in the case of too large corrosion phenomena in the region of the front arc section and so to make the rear section of the grate bar to a front section. This doubles the service life of the individual grate bar.
  • this is designed mirror-symmetrically for this purpose to a transversely to the longitudinal extent of the grate bar mirror plane.
  • the wear plate is formed from a different material from the rest of the material of the grate bar.
  • the material of the wear plate on a higher high temperature corrosion resistance as the material of the rest of the grate bar.
  • the wear plate is attached to the grate bar by suitable fastening means such as welding, screwing and the like or via a press fit.
  • the grate bar in a central rib having a shape corresponding to the wear plate recess into which the wear plate is inserted and clamped there in a suitable manner.
  • Fig. 1 shows a grate bar 1 according to the invention with a top 2, an end face 3, a rear longitudinal surface 4 and a bottom 5.
  • the grate bar 1 according to the invention may have a central rib 11 which is supported by support webs or cooling webs 12 with respect to the upper side 2.
  • the center rib 11 may have recesses 13, in which connecting means, such as Connecting rods are insertable, whereby a plurality of grate bars 1 according to the invention can be combined to form a grate.
  • connecting means such as Connecting rods
  • a wear plate 7 is arranged at the center rib 11.
  • the wear plate 7 is preferably spaced from the arc section 6 and may have support webs 17, via which it is supported relative to the center rib 11.
  • the grate bar 1 according to the invention has a support part 14 with which it rests on a support rod 18.
  • the grate bar 1 according to the invention can be arranged in a grid overlapping to adjacent grate bars, wherein it rests with a foot 15 on the top of a grate bar adjacent to its end face 3.
  • Fig. 2 shows an embodiment of a grate bar 1 according to the invention, also with a top 2, an end face 3, a rear longitudinal face 4 and a bottom 5.
  • Fig. 2 shown grate bar corresponds essentially to the structure of the grate bar, as in Fig. 1 is shown.
  • the in Fig. 2 However, shown grate bar has below the outlet opening 10 and adjacent to the wear plate 7 has a passage 16, via which can flow from the bottom 5 of combustion air flowed into a transfer port 19 before it exits through the outlet opening on the top of the grate bar 1 according to the invention and in the Brenngut arrives.
  • the overflow channel 19 begins in the region of the foot 15 and terminates in the present embodiment in the region of the end of the arranged on the upper side 2 outlet opening 10.
  • the brought up from the bottom 5 combustion air can also get into the space 20 above the foot 15 and from there via the overflow channel 19 to the outlet opening 10.
  • the arc section 6 can be cooled by means of the air flow prevailing in the overflow channel 19, whereby the occurring at the surface of the arc section 6 high-temperature corrosion can be reduced. This leads to a further extension of the service life of the grate bar 1 according to the invention.
  • Fig. 3 shows an embodiment of a grate bar 1 according to the invention, which is designed for double-sided support on a support rod.
  • the in Fig. 3 shown grate bar also has a top 2, a bottom 5, an end face 3 and a rear longitudinal surface 4, wherein end face 3 and rear longitudinal surface 4 are mirror-symmetrical to each other.
  • wear plates 7, 9 are arranged, which to the above lying arc sections 6, 8 are spaced.
  • the wear plates 7, 9 are integrally formed on a central rib 11.
  • the center rib 11 also has recesses 13, in which connecting means are insertable to assemble a plurality of grate bars 1 to a grid.
  • the center rib 11 has support webs or cooling webs 12, via which it is supported relative to the upper side 2.
  • an outlet opening 10 is arranged on the upper side 2, via which escape from the underside 5 of incoming combustion air and can get into the lying on top of the kiln.
  • combustion rods 1 according to the invention are arranged relative to one another in such a way that the support part 21 comes to rest on a support rod, while the foot 15 comes to rest on the upper side of a grate rod adjacent to the end surface 3.
  • the wear plate 7 can now first ensure that the functionality of the grate bar 1 is maintained. In the course of the grate bar 1 can be reversed, so that the corrosively attacked arc section 6 comes to rest in the rear region of the grate bar 1 and this is placed on the support section 14 on a support rod. By then adjacent to corrosive attacked arc section grate bar the attacked area of the grate bar 1 is shielded and is not exposed to any further high-temperature corrosion. As a result, the service life of the grate bar according to the invention can be further increased.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Incineration Of Waste (AREA)
  • Air-Flow Control Members (AREA)

Abstract

The grate bar (1) has an upper side (2) and a front surface (3) passing into each other over a curved section (6), and a closure plate (7) arranged below the curved section. The upper side and a rear longitudinal surface (4) pass into each other over another curved section (8), and another closure plate is arranged below the latter curved section, where the plates are arranged at a distance to the sections. An outlet opening (10) is arranged at the upper side for gaseous flow i.e. airflow, that is directed opposite to a lower side (5). Central ribs (11) are connected with the upper side.

Description

Die vorliegende Erfindung betrifft einen Roststab zur Anordnung in einem Rost einer Verbrennungsanlage.The present invention relates to a grate bar for placement in a grate of an incinerator.

Ein wichtiger Bestandteil einer Verbrennungsanlage, wie beispielsweise einer Reststoffverbrennungsanlage zur thermischen Verwertung von Müll, ist ein Verbrennungsrost. Auf einem solchen, horizontal oder geneigt in einer Verbrennungsanlage angeordneten Verbrennungsrost, wandert das Brenngut von einem ersten Ende zu einem zweiten Ende, wobei das erste Ende der Aufgabeort für das Brenngut ist und das zweite Ende in der Regel als Ausbrandrost bezeichnet wird, auf welchem die thermische Umsetzung des Brenngutes seinen Abschluss findet. Verbrennungsroste sind heutzutage meist aus einer Vielzahl von einzelnen Roststäben aufgebaut, die zu einem entsprechenden Verbrennungsrost zusammengefügt werden. Dieser Aufbau erlaubt bei Beschädigung einzelner Bereiche des Rostes den leichten Austausch einzelner Roststäbe.An important component of a combustion plant, such as a waste incineration plant for the thermal utilization of waste, is a combustion grate. On such a combustion grate arranged horizontally or inclined in an incinerator, the combustible material travels from a first end to a second end, the first end being the feedstock for the kiln and the second end typically being referred to as a burnout grate on which the thermal conversion of the kiln concludes. Combustion grates are nowadays usually constructed from a plurality of individual grate bars, which are joined together to form a corresponding combustion grate. This structure allows for easy replacement of individual grate bars in case of damage to individual areas of the grate.

Zum Transport des Brenngutes über den Rost bzw. zur Bildung einer schiefen Ebene, über die das Verbrennungsgut läuft, sind die Roststäbe üblicherweise in Reihen nebeneinander gesetzt, wobei die Reihen stufenartig übereinander angeordnet sind, so dass die Reihen sich teilweise überlappen. Üblicherweise sind die einzelnen Reihen gegeneinander verschiebbar, um einen Transport des Brenngutes durch ein Gegeneinanderverschieben der überlappenden Roststabreihen zu ermöglichen.For transporting the burning material over the grate or for forming an inclined plane over which the combustion material passes, the grate bars are usually set in rows next to each other, wherein the rows are arranged one above the other like a step, so that the rows partially overlap. Usually, the individual rows are mutually displaceable to allow a transport of the fuel by a displacement of the overlapping grate bar rows against each other.

Die in solchen Verbrennungsanlagen eingesetzten Roststäbe und die aus diesen gebildeten Roste müssen zum einen eine hinreichende mechanische Stabilität aufweisen, um das Brenngut aufnehmen und transportieren zu können, zum anderen müssen sie darüber hinaus eine geeignete Hochtemperaturbeständigkeit aufweisen, um den bei der thermischen Umsetzung des Brenngutes auftretenden Temperaturen widerstehen zu können.The grate bars used in such incinerators and of these Gratings formed must on the one hand have sufficient mechanical stability in order to be able to absorb and transport the firing material, and on the other hand they must have suitable high-temperature resistance in order to be able to withstand the temperatures occurring during the thermal conversion of the firing material.

Zur Zuführung von Verbrennungsluft in das Brenngut werden die Roststäbe bzw. Roste von einer Unterseite mit einem Luftstrom angeströmt und weisen Auslassöffnungen auf, durch welche die angeströmte Verbrennungsluft in das Brenngut gelangen kann. Solche Roste bzw. Roststäbe sind beispielsweise aus der DE 20111804 U1 bekannt. Auch die europäische Patentschrift EP 1 612 483 B1 offenbart einen entsprechenden Roststab zur Anwendung in Verbrennungsanlagen, welcher von einer Unterseite mit einem Luftstrom angeströmt wird, wobei die hier gezeigten Roststäbe Luftführungskanäle aufweisen, über welche der von unten angeströmte Luftstrom so durch den Verbrennungsrost geführt wird, dass er an der in Vorschubrichtung liegenden Längsseite des Roststabes austritt und dort in das Brenngut strömt.For supplying combustion air into the kiln, the grate bars or gratings are flown from an underside with an air flow and have outlet openings, through which the incoming combustion air can pass into the kiln. Such grates or grate bars are for example from the DE 20111804 U1 known. Also the European patent specification EP 1 612 483 B1 discloses a corresponding grate bar for use in incinerators, which is flown from an underside with an air flow, wherein the grate bars shown here have air ducts over which the stream of air flowed from below is passed through the grate so that it lies on the lying in the feed direction longitudinal side of the Roststabes exit and there flows into the kiln.

Ein Problem beim Einsatz von Rost bzw. Roststäben in Verbrennungsanlagen ist die dort auftretende Hochtemperaturkorrosion. Bei der Hochtemperaturkorrosion handelt es sich um ein hinsichtlich des Schadensbildes der Nasskorrosion ähnliches Phänomen, jedoch wird die Korrosion in diesem Fall nicht durch wässrige Medien hervorgerufen, sondern vielfach durch Reaktionen des Werkstoffs mit dem Brenngut bzw. den bei der Verbrennung entstehenden gasförmigen Verbindungen. So führen beispielsweise halogenidhaltige Salze unter den in Verbrennungsanlagen herrschenden Bedingungen zur Bildung flüchtiger Halogenide, die die auf dem Werkstoff ausgebildete, schützende Oxidschicht angreifen und so zu einer Korrosion der Werkstoffe führen. Auch im Brennstoff sowie in der Verbrennungsluft enthaltener Stickstoff kann unter den in der Verbrennungsanlage und insbesondere auf dem Rost herrschenden Bedingungen in den Werkstoff eindiffundieren und dort durch Bildung von Metalinitriden die mechanische Stabilität des Werkstoffs derart beeinträchtigen, dass es durch den Weitertransport des Brenngutes zu einem verstärkten abbrasiven Verschleiß der Roststäbe kommt.A problem with the use of rust or grate bars in incinerators is the high-temperature corrosion occurring there. High-temperature corrosion is a phenomenon similar to wet corrosion, but in this case corrosion is not caused by aqueous media, but rather by reactions of the material with the kiln or gaseous compounds produced during combustion. For example, halide-containing salts under the conditions prevailing in incinerators lead to the formation of volatile halides which attack the protective oxide layer formed on the material and thus lead to corrosion of the materials. Also contained in the fuel and in the combustion air nitrogen can diffuse under the conditions prevailing in the incinerator and in particular on the rust conditions in the material and there affect the mechanical stability of the material through the formation of metal nitrides such that it by the further transport of the fuel to a reinforced Abrasive wear of the grate bars comes.

Durch den hierdurch hervorgerufenen Verschleiß ist es notwendig, die Roststäbe bzw. Roste in regelmäßigen oder unregelmäßigen Abständen auszutauschen, um die Funktionssicherheit der Roststäbe sicherstellen zu können. Zum Austausch der Roststäbe muss die Verbrennungsanlage jedoch heruntergefahren werden und auskühlen, was mit erheblichen Totzeiten der Gesamtanlage einhergeht. Diese Totzeiten führen zu wirtschaftlichen Nachteilen, die es zu vermeiden gilt. Darüber hinaus zeigen Verbrennungsanlagen, wie insbesondere Müllverbrennungsanlagen, vielfach nur im stationären Zustand ein optimales Verbrennungsverhalten, wobei während der Zeit des Anfahrens und Herunterfahrens der Verbrennungsanlage ungünstige Verbrennungszustände auftreten können, bei welchen verstärkt Schadstoffe entstehen. Diese werden zwar durch die nachgeschalteten Filtersysteme abgefangen, jedoch führt dies zu einer verstärkten Belastung dieser Systeme. Hierdurch ist wiederum eine frühzeitigere Wartung der Filtersysteme notwendig.Due to the resulting wear, it is necessary to replace the grate bars or grates at regular or irregular intervals in order to ensure the reliability of the grate bars. To replace the grate bars However, the incinerator must be shut down and cool, which is associated with significant dead times of the entire system. These dead times lead to economic disadvantages, which must be avoided. Moreover, incineration plants, such as in particular waste incineration plants, often only in the stationary state an optimal combustion behavior, which may occur during the time of startup and shutdown of the incinerator inconvenient combustion conditions in which increasingly pollutants. Although these are intercepted by the downstream filter systems, but this leads to an increased load on these systems. This in turn requires earlier maintenance of the filter systems.

Es ist daher die Aufgabe der vorliegenden Erfindung, die Standzeit der in Verbrennungsanlagen eingesetzten Roststäbe zu verlängern.It is therefore the object of the present invention to extend the service life of the grate bars used in incinerators.

Gelöst wird diese Aufgabe durch einen Roststab zur Anordnung in einem Rost einer Verbrennungsanlage, mit einer Oberseite, einer Stirnfläche, einer hinteren Längsfläche und einer Unterseite, wobei die Oberseite und Stirnfläche über einen Bogenabschnitt ineinander übergehen, welcher dadurch gekennzeichnet ist, dass zumindest unterhalb des Bogenabschnittes eine Verschleißplatte angeordnet ist. This object is achieved by a grate bar for arrangement in a grate of a combustion plant, with an upper side, an end face, a rear longitudinal face and a lower face, wherein the upper face and end face merge into one another via an arc section, which is characterized in that at least below the arc section a wear plate is arranged.

Es hat sich herausgestellt, dass insbesondere im Bereich des Bogenabschnittes, der die Oberseite eines Roststabs mit seiner Stirnfläche verbindet, verstärkt Hochtemperaturkorrosionsphänomene auftreten, so dass es hier zu erhöhten Verschleißerscheinungen kommt. Überraschenderweise hat sich gezeigt, dass durch Anordnung einer Verschleißplatte unterhalb des Bogenabschnittes im Fall der Korrosion des den Bogenabschnitt bildenden Werkstoffes die Funktionssicherheit des Roststabs weiterhin sichergestellt wird. Zum einen wird der vordere Abschnitt des Roststabes durch die eingebrachte Verschleißplatte mechanisch stabilisiert, so dass auch bei Korrosion des Bogenabschnittes eine hinreichende mechanische Gesamtstabilität gegeben ist, zum anderen verhindert die Verschleißplatte selbst im Fall des Durchrostens des Bogenabschnittes, dass Brenngut nicht in den Bereich unterhalb des Roststabes gelangen kann.It has been found that, in particular in the area of the curved section which connects the upper side of a grate bar with its end face, high-temperature corrosion phenomena increasingly occur, so that increased wear occurs here. Surprisingly, it has been found that the functional safety of the grate bar is still ensured by arranging a wear plate below the arc section in the case of corrosion of the material forming the arc section. On the one hand, the front portion of the grate bar is mechanically stabilized by the introduced wear plate, so that even with corrosion of the arc section is given a sufficient mechanical stability, on the other hand, the wear plate prevents even in the case of the grilling of the arc section that kiln not in the area below the Rust bar can get.

Die erfindungsgemäß vorzusehende Verschleißplatte ist vorzugsweise beabstandet vom Bogenabschnitt auf der Innenseite des Roststabes angeordnet.The inventively provided wear plate is preferably arranged at a distance from the arc section on the inside of the grate bar.

Ein erfindungsgemäßer Roststab kann auf seiner Oberseite eine Austrittsöffnung für gegen die Unterseite gerichtete gasförmige Medien, wie beispielsweise Verbrennungsluft, aufweisen. Durch diese Öffnung gelangt die Verbrennungsluft von dem Bereich unterhalb des Roststabes in das auf dem Roststab befindliche Brenngut. Hierdurch wird Verbrennungsluft in der Weise in das Brenngut geleitet, dass eine hinreichende Versorgung des Verbrennungsprozesses mit Verbrennungsluft sichergestellt ist.A grate bar according to the invention may have on its upper side an outlet opening for gaseous media directed against the lower side, such as, for example, combustion air. Through this opening, the combustion air passes from the area below the grate bar in the firing rod located on the grate bar. As a result, combustion air is passed into the kiln in such a way that a sufficient supply of the combustion process with combustion air is ensured.

Die erfindungsgemäß vorzusehende Verschleißplatte kann an einer Mittelrippe des Roststabes befestigt sein oder an dieser angeformt sein. In einer bevorzugten Ausgestaltung des erfindungsgemäßen Roststabes ist dieser einstückig ausgebildet, so dass die Verschleißplatte an eine Mittelrippe des Roststabes angeformt ist. Zur einstückigen Ausgestaltung des Roststabes kann dieser beispielsweise aus einem geeigneten Material gegossen sein.The inventively provided wear plate may be attached to a central rib of the grate bar or be formed on this. In a preferred embodiment of the grate bar according to the invention, this is integrally formed, so that the wear plate is integrally formed on a central rib of the grate bar. For one-piece design of the grate bar this can be cast, for example, from a suitable material.

Die zuvor erwähnte Mittelrippe kann in einem erfindungsgemäßen Roststab Stützstege bzw. Kühlstege aufweisen, über welche die Mittelrippe gegenüber der Oberseite des Roststabes abgestützt ist. Darüber hinaus können die Stützstege bzw. Kühlstege luftleitende Funktionen erfüllen und eine Führung des von unten gegen den Roststab herangeführten Luftstroms zu der an der Oberseite des Roststabs angeordneten Austrittsöffnung sicherstellen.The above-mentioned center rib may comprise support webs or cooling webs in a grate bar according to the invention, via which the center rib is supported relative to the upper side of the grate bar. In addition, the support webs or cooling webs can fulfill air-conducting functions and ensure guidance of the air flow directed from below against the grate bar to the outlet opening arranged at the top of the grate bar.

Zur Verbindung mehrerer erfindungsgemäßer Roststäbe zu einem Rost kann ein erfindungsgemäßer Roststab Ausnehmungen, insbesondere im Bereich der Mittelrippe, aufweisen, über welche mehrere Roststäbe miteinander verbunden werden können. Als Verbindungsmittel sind beispielsweise Verbindungsstege geeignet, welche in die Ausnehmungen einführbar sind.For connecting a plurality of grate bars according to the invention to a grate, a grate bar according to the invention can have recesses, in particular in the region of the center rib, via which a plurality of grate bars can be connected to one another. As connecting means, for example connecting webs are suitable, which are insertable into the recesses.

Zur Grundbefestigung kann ein erfindungsgemäßer Roststab eine Auflagepartie aufweisen, mit welcher er auf einen Haltestab aufgelegt werden kann. Der Haltestab dient dabei gleichzeitig als Drehlager, um welchen ein Drehen des Roststabs bei einem Verschieben von übereinanderliegenden, einzelne Rostabschnitte bildenden Roststäben ermöglicht wird. In einer besonderen Ausgestaltung des erfindungsgemäßen Roststabes weist dieser sowohl im vorderen Bereich des Roststabes als auch im hinteren Bereich eine Auflagepartie auf. Hierdurch ist es möglich, den Roststab im Falle zu großer Korrosionserscheinungen im Bereich des vorderen Bogenabschnittes umzudrehen und so den hinteren Abschnitt des Roststabes zu einem vorderen Abschnitt zu machen. Dies verdoppelt die Standzeit des einzelnen Roststabes.For basic fastening, a grate bar according to the invention can have a support section with which it can be placed on a holding bar. The support rod serves at the same time as a pivot bearing, around which a rotation of the grate bar is made possible when moving superposed, individual grate sections forming grate bars. In a particular embodiment of the grate bar according to the invention, this has a support section both in the front region of the grate bar and in the rear region. This makes it possible to turn the grate bar in the case of too large corrosion phenomena in the region of the front arc section and so to make the rear section of the grate bar to a front section. This doubles the service life of the individual grate bar.

In einer besonderen Ausführung des erfindungsgemäßen Roststabes ist dieser zu diesem Zweck spiegelsymmetrisch zu einer quer zur Längenerstreckung des Roststabes stehenden Spiegelebene ausgebildet.In a particular embodiment of the grate bar according to the invention this is designed mirror-symmetrically for this purpose to a transversely to the longitudinal extent of the grate bar mirror plane.

In einer weiteren Ausgestaltung des erfindungsgemäßen Roststabes ist die Verschleißplatte aus einem von dem übrigen Werkstoff des Roststabes verschiedenen Material gebildet. Insbesondere weist das Material der Verschleißplatte eine höhere Hochtemperaturkorrosionsbeständigkeit auf, als der Werkstoff des übrigen Roststabes. In einer solchen Ausgestaltung ist die Verschleißplatte an dem Roststab durch geeignete Befestigungsmittel wie beispielsweise Schweißen, Verschrauben und dergleichen oder auch über einen Klemmsitz befestigt. Hierzu kann der Roststab in einer Mittelrippe eine der Form der Verschleißplatte entsprechende Ausnehmung aufweisen, in welche die Verschleißplatte eingeschoben und dort in geeigneter Weise verklemmt wird.In a further embodiment of the grate bar according to the invention the wear plate is formed from a different material from the rest of the material of the grate bar. In particular, the material of the wear plate on a higher high temperature corrosion resistance, as the material of the rest of the grate bar. In such an embodiment, the wear plate is attached to the grate bar by suitable fastening means such as welding, screwing and the like or via a press fit. For this purpose, the grate bar in a central rib having a shape corresponding to the wear plate recess into which the wear plate is inserted and clamped there in a suitable manner.

Die Erfindung ist nachfolgend anhand von Figuren näher erläutert.

Fig. 1
zeigt einen Querschnitt durch einen erfindungsgemäßen Roststab.
Fig. 2
zeigt einen Querschnitt durch eine weitere Ausgestaltung eines erfindungsgemäßen Roststabs.
Fig. 3
zeigt einen erfindungsgemäßen Roststab mit zwei Auflagepartien.
The invention is explained in more detail with reference to figures.
Fig. 1
shows a cross section through a grate bar according to the invention.
Fig. 2
shows a cross section through a further embodiment of a grate bar according to the invention.
Fig. 3
shows a grate bar according to the invention with two support parts.

Fig. 1 zeigt einen erfindungsgemäßen Roststab 1 mit einer Oberseite 2, einer Stirnfläche 3, einer hinteren Längsfläche 4 und einer Unterseite 5. Oberseite 2 und Stirnfläche 3 einerseits und Oberseite 2 und hintere Längsfläche 4 andererseits gehen über Bogenabschnitte 6, 8 ineinander über. Auf der Oberseite 2 befindet sich eine Austrittsöffnung 10 für von der Unterseite 5 her gegen den erfindungsgemäßen Roststab 1 gerichtete gasförmige Medien, wie beispielsweise einen Verbrennungsluftstrom. Der erfindungsgemäße Roststab 1 kann eine Mittelrippe 11 aufweisen, welche über Stützstege bzw. Kühlstege 12 gegenüber der Oberseite 2 abgestützt ist. Die Mittelrippe 11 kann Ausnehmungen 13 aufweisen, in welche Verbindungsmittel, wie beispielsweise Verbindungsstäbe einführbar sind, wodurch mehrere erfindungsgemäße Roststäbe 1 zu einem Rost zusammengefasst werden können. An der Mittelrippe 11 ist eine Verschleißplatte 7 angeordnet. Die Verschleißplatte 7 ist vorzugsweise beabstandet zum Bogenabschnitt 6 angeordnet und kann Stützstege 17 aufweisen, über welche sie sich gegenüber der Mittelrippe 11 abstützt. Des Weiteren weist der erfindungsgemäße Roststab 1 eine Auflagepartie 14 auf, mit welcher er auf einem Auflagestab 18 aufliegt. Der erfindungsgemäße Roststab 1 kann in einem Rost überlappend zu benachbarten Roststäben angeordnet sein, wobei er mit einem Fuß 15 auf der Oberseite eines zu seiner Stirnseite 3 benachbarten Roststabes aufliegt. Fig. 1 shows a grate bar 1 according to the invention with a top 2, an end face 3, a rear longitudinal surface 4 and a bottom 5. top 2 and end face 3 on the one hand and top 2 and rear longitudinal face 4 on the other hand via arc sections 6, 8 into each other. On the top 2 there is an outlet opening 10 for directed from the bottom 5 ago against the grate bar 1 according to the invention gaseous media, such as a combustion air flow. The grate bar 1 according to the invention may have a central rib 11 which is supported by support webs or cooling webs 12 with respect to the upper side 2. The center rib 11 may have recesses 13, in which connecting means, such as Connecting rods are insertable, whereby a plurality of grate bars 1 according to the invention can be combined to form a grate. At the center rib 11, a wear plate 7 is arranged. The wear plate 7 is preferably spaced from the arc section 6 and may have support webs 17, via which it is supported relative to the center rib 11. Furthermore, the grate bar 1 according to the invention has a support part 14 with which it rests on a support rod 18. The grate bar 1 according to the invention can be arranged in a grid overlapping to adjacent grate bars, wherein it rests with a foot 15 on the top of a grate bar adjacent to its end face 3.

Fig. 2 zeigt eine Ausgestaltung eines erfindungsgemäßen Roststabes 1, ebenfalls mit einer Oberseite 2, einer Stirnfläche 3, einer hinteren Längsfläche 4 und einer Unterseite 5. Der Aufbau des in Fig. 2 gezeigten Roststabes entspricht im Wesentlichen dem Aufbau des Roststabes, wie er in Fig. 1 gezeigt ist. Der in Fig. 2 gezeigte Roststab weist jedoch unterhalb der Austrittsöffnung 10 und angrenzend an die Verschleißplatte 7 einen Durchlass 16 auf, über welchen von der Unterseite 5 angeströmte Verbrennungsluft in einen Überströmkanal 19 gelangen kann, bevor sie über die Austrittsöffnung auf der Oberseite des erfindungsgemäßen Roststabes 1 austritt und in das Brenngut gelangt. Der Überströmkanal 19 beginnt im Bereich des Fußes 15 und endet in der vorliegenden Ausführungsform im Bereich des Endes der auf der Oberseite 2 angeordneten Austrittsöffnung 10. Neben dem Durchlass 16 kann die von der Unterseite 5 herangeführte Verbrennungsluft auch in den Raum 20 über dem Fuß 15 gelangen und von dort über den Überströmkanal 19 zur Austrittsöffnung 10. Hierdurch kann der Bogenabschnitt 6 mittels des im Überströmkanal 19 herrschenden Luftstroms gekühlt werden, wodurch die an der Oberfläche des Bogenabschnitts 6 auftretende Hochtemperaturkorrosion verringert werden kann. Dies führt zu einer weiteren Verlängerung der Standzeit des erfindungsgemäßen Roststabes 1. Fig. 2 shows an embodiment of a grate bar 1 according to the invention, also with a top 2, an end face 3, a rear longitudinal face 4 and a bottom 5. Der Aufbau des in Fig. 2 shown grate bar corresponds essentially to the structure of the grate bar, as in Fig. 1 is shown. The in Fig. 2 However, shown grate bar has below the outlet opening 10 and adjacent to the wear plate 7 has a passage 16, via which can flow from the bottom 5 of combustion air flowed into a transfer port 19 before it exits through the outlet opening on the top of the grate bar 1 according to the invention and in the Brenngut arrives. The overflow channel 19 begins in the region of the foot 15 and terminates in the present embodiment in the region of the end of the arranged on the upper side 2 outlet opening 10. In addition to the passage 16, the brought up from the bottom 5 combustion air can also get into the space 20 above the foot 15 and from there via the overflow channel 19 to the outlet opening 10. In this way, the arc section 6 can be cooled by means of the air flow prevailing in the overflow channel 19, whereby the occurring at the surface of the arc section 6 high-temperature corrosion can be reduced. This leads to a further extension of the service life of the grate bar 1 according to the invention.

Fig. 3 zeigt eine Ausführung eines erfindungsgemäßen Roststabes 1, welcher zur beidseitigen Auflage auf einer Stützstange ausgebildet ist. Der in Fig. 3 gezeigte Roststab weist auch eine Oberseite 2, eine Unterseite 5, eine Stirnfläche 3 und eine hintere Längsfläche 4 auf, wobei Stirnfläche 3 und hintere Längsfläche 4 spiegelsymmetrisch zueinander ausgebildet sind. Gleiches gilt für die Bogenabschnitte 6 und 8, über welche die Oberseite in die Stirnfläche 3 bzw. die hintere Längsfläche 4 übergeht. Unterhalb der Bogenabschnitte 6, 8 sind Verschleißplatten 7, 9 angeordnet, welche zu den darüber liegenden Bogenabschnitten 6, 8 beabstandet sind. Im gezeigten Ausführungsbeispiel sind die Verschleißplatten 7, 9 an eine Mittelrippe 11 angeformt. Die Mittelrippe 11 weist darüber hinaus Ausnehmungen 13 auf, in welche Verbindungsmittel einführbar sind, um mehrere Roststäbe 1 zu einem Rost zusammenzufügen. Darüber hinaus weist die Mittelrippe 11 Stützstege bzw. Kühlstege 12 auf, über welche sie gegenüber der Oberseite 2 abgestützt ist. Im mittleren Bereich des Roststabes ist an der Oberseite 2 eine Austrittsöffnung 10 angeordnet, über welche von der Unterseite 5 anströmende Verbrennungsluft austreten und in das auf der Oberseite liegende Brenngut gelangen kann. In einer Verbrennungsanlage werden erfindungsgemäße Verbrennungsstäbe 1 so zueinander angeordnet, dass die Auflagepartie 21 auf einer Stützstange zu liegen kommt, während der Fuß 15 auf der Oberseite eines zur Stirnfläche 3 benachbarten Roststabes zu liegen kommt. Hierdurch wird der Bogenabschnitt 8 des benachbarten Roststabes verdeckt und ist so keiner Hochtemperaturkorrosion ausgesetzt. Im Fall von Korrosionsschäden im Bereich des Bogenabschnittes 6 kann nun zuerst die Verschleißplatte 7 dafür Sorge tragen, dass die Funktionsfähigkeit des Roststabes 1 erhalten bleibt. Im weiteren Verlauf kann der Roststab 1 umgedreht werden, so dass der korrosiv angegriffene Bogenabschnitt 6 im hinteren Bereich des Roststabes 1 zu liegen kommt und dieser über die Auflagepartie 14 auf einer Stützstange aufgelegt wird. Durch den dann zum korrosiv angegriffenen Bogenabschnitt benachbarten Roststab wird der angegriffene Bereich des Roststabes 1 abgeschirmt und ist keiner weiteren Hochtemperaturkorrosion ausgesetzt. Hierdurch kann die Standzeit des erfindungsgemäßen Roststabes weiter erhöht werden. Fig. 3 shows an embodiment of a grate bar 1 according to the invention, which is designed for double-sided support on a support rod. The in Fig. 3 shown grate bar also has a top 2, a bottom 5, an end face 3 and a rear longitudinal surface 4, wherein end face 3 and rear longitudinal surface 4 are mirror-symmetrical to each other. The same applies to the arc sections 6 and 8, via which the upper side merges into the end face 3 and the rear longitudinal face 4. Below the arcuate sections 6, 8 wear plates 7, 9 are arranged, which to the above lying arc sections 6, 8 are spaced. In the illustrated embodiment, the wear plates 7, 9 are integrally formed on a central rib 11. The center rib 11 also has recesses 13, in which connecting means are insertable to assemble a plurality of grate bars 1 to a grid. In addition, the center rib 11 has support webs or cooling webs 12, via which it is supported relative to the upper side 2. In the central region of the grate bar, an outlet opening 10 is arranged on the upper side 2, via which escape from the underside 5 of incoming combustion air and can get into the lying on top of the kiln. In a combustion system, combustion rods 1 according to the invention are arranged relative to one another in such a way that the support part 21 comes to rest on a support rod, while the foot 15 comes to rest on the upper side of a grate rod adjacent to the end surface 3. As a result, the arc section 8 of the adjacent grate bar is hidden and is thus not exposed to high-temperature corrosion. In the case of corrosion damage in the region of the arc section 6, the wear plate 7 can now first ensure that the functionality of the grate bar 1 is maintained. In the course of the grate bar 1 can be reversed, so that the corrosively attacked arc section 6 comes to rest in the rear region of the grate bar 1 and this is placed on the support section 14 on a support rod. By then adjacent to corrosive attacked arc section grate bar the attacked area of the grate bar 1 is shielded and is not exposed to any further high-temperature corrosion. As a result, the service life of the grate bar according to the invention can be further increased.

Bezugszeichenliste:LIST OF REFERENCE NUMBERS

11
Roststabgrate bar
22
Oberseitetop
33
Stirnflächeface
44
hintere Längsflächerear longitudinal surface
55
Unterseitebottom
6, 86, 8
Bogenabschnittarc section
7, 97, 9
Verschleißplattewear plate
1010
Austrittsöffnungoutlet opening
1111
Mittelrippemidrib
1212
Stützsteg/KühlstegSupport web / cooling dock
1313
Ausnehmungrecess
14, 2114, 21
Auflagepartieedition game
15,2215.22
Fußfoot
1616
Durchlasspassage
1717
Stützstegsupporting web
1818
Auflagestabsupport pole
1919
Überströmkanaloverflow
2020
Raum über FußRoom over foot

Claims (10)

Roststab zur Anordnung in einem Rost einer Verbrennungsanlage, mit einer Oberseite (2), einer Stirnfläche (3), einer hinteren Längsfläche (4) und einer Unterseite (5), wobei die Oberseite (2) und Stirnfläche (3) über einen Bogenabschnitt (6) ineinander übergehen,
dadurch gekennzeichnet,
dass zumindest unterhalb des Bogenabschnittes (6) eine Verschleißplatte (7) angeordnet ist.Grate bar for placement in a grate of an incinerator, having an upper side (2), an end face (3), a rear longitudinal face (4) and a lower face (5), the upper face (2) and end face (3) being curved over an arc portion (3). 6) merge into each other,
characterized,
that at least below the arc portion (6) has a wear plate (7) is arranged. Roststab nach Anspruch 1, wobei die Oberseite (2) und die hintere Längsfläche (4) über einen Bogenabschnitt bzw. Schrägen (8) ineinander übergehen und unterhalb des Bogenabschnittes bzw. der Schrägen (8) eine Verschleißplatte (9) angeordnet ist.Grate bar according to claim 1, wherein the upper side (2) and the rear longitudinal surface (4) via an arc section or bevels (8) merge into one another and below the arc section or the bevels (8) a wear plate (9) is arranged. Roststab nach Anspruch 1 oder 2, wobei die Verschleißplatte (7, 9) zu dem jeweils über ihr liegenden Bogenschabschnitt (6, 8) beabstandet angeordnet ist.Grate bar according to claim 1 or 2, wherein the wear plate (7, 9) to the respective overlying Bogenschabschnitt (6, 8) is arranged spaced. Roststab nach einem der vorhergehenden Ansprüche, wobei dieser an seiner Oberseite (2) eine Austrittsöffnung (10) für einen gegen die Unterseite (5) gerichteten gasförmigen Fluidstrom, insbesondere Luftstrom, aufweist.Grate bar according to one of the preceding claims, wherein this on its upper side (2) has an outlet opening (10) for a against the underside (5) directed gaseous fluid flow, in particular air flow. Roststab nach einem der vorhergehenden Ansprüche, wobei dieser eine Mittelrippe (11) aufweist, welche mit der Oberseite (2) verbunden ist und an welcher die Verschleißplatte (7, 9) befestigt oder angeformt ist.Grate bar according to one of the preceding claims, wherein it has a central rib (11) which is connected to the upper side (2) and to which the wear plate (7, 9) is attached or formed. Roststab nach Anspruch 5, wobei dieser Stützstege (12) aufweist, über welche die Mittelrippe (11) gegen die Oberseite (2) abgestützt ist.A grate bar according to claim 5, wherein said grate bar (12) over which said center rib (11) is supported against said top surface (2). Roststab nach einem der Ansprüche 5 oder 6, wobei die Mittelrippe (11) wenigstens eine Ausnehmung (13) aufweist, in welche zur Verbindung von zwei nebeneinander angeordneten Roststäben ein Verbindungsmittel, insbesondere ein Verbindungsstab, einführbar ist.Grate bar according to one of claims 5 or 6, wherein the central rib (11) has at least one recess (13) into which a connection means, in particular a connecting rod, can be introduced for connecting two adjacent grate bars. Roststab nach einem der vorhergehenden Ansprüche, wobei dieser zumindest eine Auflagepartie (14) aufweist, mit welcher der Roststab (1) auf einen Auflagestab (18) auflegbar ist.Grate bar according to one of the preceding claims, wherein it has at least one support part (14) with which the grate bar (1) can be placed on a support bar (18). Roststab nach einem der vorhergehenden Ansprüche, wobei dieser einstückig gebildet ist.Grate bar according to one of the preceding claims, wherein it is integrally formed. Roststab nach einem der Ansprüche 1 bis 8, wobei die Verschleißplatte (7, 9) eine höhere Korrosionsbeständigkeit gegen Hochtemperaturkorrosion aufweist, als der über ihr liegende Bogenabschnitt (6, 8).Grate bar according to one of claims 1 to 8, wherein the wear plate (7, 9) has a higher corrosion resistance to high-temperature corrosion than the overlying arch portion (6, 8).
EP10008873.1A 2009-09-23 2010-08-26 Grate bar Active EP2306086B1 (en)

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PL10008873T PL2306086T3 (en) 2009-09-23 2010-08-26 Grate bar

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200910042722 DE102009042722A1 (en) 2009-09-23 2009-09-23 grate bar

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DE (1) DE102009042722A1 (en)
DK (1) DK2306086T3 (en)
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PT (1) PT2306086T (en)
RU (1) RU2010139008A (en)
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2511609A2 (en) 2011-04-15 2012-10-17 WVT Breiding GmbH Modular grate bar, overlay element, focal track element and foot element for same and moving grate of a combustion assembly
DE202011005341U1 (en) 2011-04-15 2014-05-20 Wvt Breiding Gmbh Modular grate bar, support element, focal element and foot element for it as well as feed grate of a combustion plant
DE102014004660A1 (en) 2014-02-10 2015-08-13 Joachim Kümmel Method for incinerating waste and biomass on an air-cooled grate, and device for carrying out the method
DE102014008858A1 (en) 2014-06-16 2015-12-17 Joachim Kümmel Method for incinerating waste and biomass on a fin-wall step grate and apparatus for carrying out the method

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20111804U1 (en) 2001-07-16 2001-09-27 Wvt Breiding Gmbh Rust and rust bars
EP1612483B1 (en) 2004-07-03 2008-07-23 AE & E Lentjes GmbH Grate bar, combustion grate using the same and corresponding waste material incineration plant

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Publication number Priority date Publication date Assignee Title
CH652476A5 (en) * 1983-05-20 1985-11-15 Theodor Koch GRID BAR.
EP0165432B1 (en) * 1984-05-21 1989-05-10 KOCH, Theodor Furnace, especially for the combustion of refuse, coal, wood and industrial waste
US6422161B2 (en) * 1995-03-23 2002-07-23 Theodor Koch Combustion grate and process for optimizing its operation
DE19528310A1 (en) * 1995-08-02 1997-02-06 Abb Management Ag Grate for a furnace

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20111804U1 (en) 2001-07-16 2001-09-27 Wvt Breiding Gmbh Rust and rust bars
EP1612483B1 (en) 2004-07-03 2008-07-23 AE & E Lentjes GmbH Grate bar, combustion grate using the same and corresponding waste material incineration plant

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2511609A2 (en) 2011-04-15 2012-10-17 WVT Breiding GmbH Modular grate bar, overlay element, focal track element and foot element for same and moving grate of a combustion assembly
DE102011100369A1 (en) 2011-04-15 2012-10-18 Wvt Breiding Gmbh Modular grate bar, support element, focal element and foot element for it as well as feed grate of a combustion plant
DE202011005341U1 (en) 2011-04-15 2014-05-20 Wvt Breiding Gmbh Modular grate bar, support element, focal element and foot element for it as well as feed grate of a combustion plant
DE102014004660A1 (en) 2014-02-10 2015-08-13 Joachim Kümmel Method for incinerating waste and biomass on an air-cooled grate, and device for carrying out the method
DE102014008858A1 (en) 2014-06-16 2015-12-17 Joachim Kümmel Method for incinerating waste and biomass on a fin-wall step grate and apparatus for carrying out the method

Also Published As

Publication number Publication date
EP2306086A3 (en) 2013-02-20
PT2306086T (en) 2018-03-06
DE102009042722A1 (en) 2011-03-24
RU2010139008A (en) 2012-03-27
DK2306086T3 (en) 2018-04-09
TR201802367T4 (en) 2018-03-21
EP2306086B1 (en) 2017-12-27
PL2306086T3 (en) 2018-06-29

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