EP0811803A2 - Grate element and grate with liquid-cooling - Google Patents

Grate element and grate with liquid-cooling Download PDF

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Publication number
EP0811803A2
EP0811803A2 EP97108567A EP97108567A EP0811803A2 EP 0811803 A2 EP0811803 A2 EP 0811803A2 EP 97108567 A EP97108567 A EP 97108567A EP 97108567 A EP97108567 A EP 97108567A EP 0811803 A2 EP0811803 A2 EP 0811803A2
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EP
European Patent Office
Prior art keywords
grate
grate element
liquid
channel
element according
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Granted
Application number
EP97108567A
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German (de)
French (fr)
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EP0811803B1 (en
EP0811803A3 (en
Inventor
Johannes Josef Edmund Martin
Thomas Nikolaus
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Seghers Keppel Technology Group
Martin GmbH fuer Umwelt und Energietechnik
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Techform Engineering GmbH
Martin GmbH fuer Umwelt und Energietechnik
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Priority to SI9730716T priority Critical patent/SI0811803T1/en
Publication of EP0811803A2 publication Critical patent/EP0811803A2/en
Publication of EP0811803A3 publication Critical patent/EP0811803A3/en
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Publication of EP0811803B1 publication Critical patent/EP0811803B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23H—GRATES; CLEANING OR RAKING GRATES
    • F23H17/00—Details of grates
    • F23H17/12—Fire-bars
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23H—GRATES; CLEANING OR RAKING GRATES
    • F23H2900/00—Special features of combustion grates
    • F23H2900/03021—Liquid cooled grates

Definitions

  • the invention relates to a grate element with liquid cooling with at least one channel intended for guiding the liquid with parallel sections and with a liquid inlet and a liquid outlet.
  • the invention also relates to a grate constructed from such grate elements.
  • Grate elements of a grate which consists of grating steps that are stacked on top of one another and can be moved relative to one another and that are made up of one or more grating elements lying next to one another, are exposed to high, strongly fluctuating thermal loads, high mechanical abrasion and chemical attacks.
  • the wear of a grate element essentially depends on the heat load, so that liquid-cooled grate elements have recently been introduced, since the liquid cooling promises better cooling and more uniform temperature distribution within the grate element.
  • a plate-shaped grate element which is designed as a hollow sheet metal body and has an inlet and an outlet for cooling water.
  • baffles can also be provided in the hollow body in order to force a meandering passage of the cooling water through the grate element.
  • the inlet and the outlet are provided in the area of the fastening or drive end of the grate element.
  • grate elements are insufficiently ventilated, so that larger air accumulations can form, which in this area lead to significantly poorer cooling and thus to overheating of the grate element.
  • the grate elements are arranged in a return grate in which the grate element heads are located at a higher point than the respective fastening or drive end of the grate element due to the inclined installation position. In such an installation position, the air present in the grate element then collects in the head region of the grate element, which is basically exposed to a higher thermal load regardless of the grate type, so that the wear of the grate element increases sharply in connection with the poorer cooling effect caused by air bubbles.
  • the grate elements designed as hollow sheet metal bodies can warp in the event of non-uniform cooling and thus lead to malfunctions in grate operation.
  • the overheating, in particular of the head area which can be attributed to air bubbles, explained above, can therefore only be recognized insufficiently.
  • a liquid-cooled grate bar which has at least one channel, the sections of which run parallel to one another in the longitudinal direction of the grate bar and are connected to a deflection in the head region of the grate bar.
  • the inlet and outlet for this channel is also in this known grate bar in the rear area, that is in the area of the fastening or drive end, so that here, too, basically similar disadvantages occur as with the plate-shaped grate element mentioned first.
  • this known grate bar which has a channel which is essentially rectangular in cross section and a kinking course for deflection in the head region, flow breaks or vortices and air accumulations cannot be carried out with certainty be avoided.
  • the outlet is also provided in the rear area of the grate bar, not only is the temperature detection, as already described, inadequate, but also the ventilation, that is to say the removal of any air bubbles which may have formed, is extremely difficult.
  • the object of the invention is to design a grate element with liquid cooling of the type specified above in such a way that a targeted cooling of the grate element which is adapted to the respective conditions is possible with little design and control expenditure.
  • this object is achieved according to the invention in that the parallel sections of the channel run transversely to the grate element longitudinal direction and thus transversely to the firing material conveying direction, that the channel sections run in a straight line and have a cross section which requires a compact, tear-free and dead space-free flow.
  • An advantageous embodiment provides that in each case two rectilinear channel sections are connected by a deflection and can therefore be flowed through by the liquid in series and that the liquid inlet in the area of the fastening or drive end and the Liquid drain is provided in the head area of the grate element.
  • all the channel sections can have a common liquid inlet and a common liquid outlet and thus the liquid can flow through them in parallel.
  • An advantageous embodiment consists in that the channel sections have a circular cross section with a diameter of 5 to 25 mm.
  • the channel sections have a narrow cross section of 20 to 500 mm 2 .
  • the grate element consists of a solid, pressure-resistant plate-shaped main part and narrow, solid, pressure-resistant side parts fastened on both sides, and that the main part has the rectilinear channel sections and the side parts have the deflections. Because of this configuration, it is possible to manufacture the main part of the grate element from a solid steel plate by introducing corresponding through bores, the side parts attached to it having the deflections.
  • the side parts can each be cast in one piece or made in two parts from rolled steel in order to produce the deflections, for example by milling, which allows the production of particularly smooth inner walls of the deflections.
  • the channel as a whole has a smooth inner wall produced by fine machining, which can be achieved by drilling the straight-line channel sections and producing the deflections by milling.
  • the distances between the channel sections in the head region can be the smallest and larger in the direction of the fastening or drive end.
  • a temperature sensor for regulating the coolant temperature by changing the flow rate and / or the pressure of the coolant is provided at the outlet, it can be particularly due to the fact that the outlet lies in the head region, that is to say in the hottest region of the grate bar sensitive control can be carried out, since the hottest temperature of the cooling medium and the grate bar can be detected by this configuration, which in the arrangement of the outlet is not possible with this accuracy at the rear end of the grate element.
  • the change in the pressure of the cooling medium is necessary in a self-contained system in the range of the boiling point of the coolant in order to increase it to avoid vapor bubbles.
  • the arrangement of a temperature sensor in the outlet has the advantage that, for example, the necessary feed line can be laid within the drain line of the cooling medium, as a result of which this feed line is particularly well protected. Exposed supply lines to temperature sensors on grate bars are often subject to the risk of destruction during this rough operation.
  • air outlet openings can be provided in the head area for the combustion grate formed from the grate grate formed below the grate elements arranged one above the other without any special precautions for the training such air outlet openings would have to be made.
  • a grate for incineration plants with grate steps one behind the other in the firing material conveying direction, overlapping one another like roof tiles, and alternately movable and fixed grate steps, which is constructed from individual grate elements that extend over the entire grate width or from several grate elements lying next to one another according to one of claims 1 to 11, is characterized in that each grate step is assigned its own controllable coolant circuit. In the event that each grate stage is constructed from several grate elements, these can be acted upon by the cooling liquid either in series or in parallel.
  • each grate element is assigned its own controllable coolant circuit.
  • At least two grate stages located one behind the other are assigned to their own coolant circuit.
  • a grate is constructed from a plurality of grate elements 1 and 2, which overlap like roof tiles, of which the grate elements 1 can be moved back and forth in the direction of the double arrow 3 and the grate elements 2 are arranged in a fixed manner.
  • the grate elements 1 are assigned to a drive device 4, which generates the required stroke.
  • Each grate element has a fastening or drive end 5 which is suspended in a holder 6, this holder 6 being firmly connected to the drive device 4 in the case of the driven grate elements.
  • each grate element has a head end 7 and a back 9.
  • each grate element 1 or 2 is constructed in three parts and consists of a main part 10 and two side parts 11 and 12.
  • the main part 10 consists of a solid, pressure-resistant plate which is transverse to the longitudinal direction, that is to say transversely to the conveying direction of the combustible material is penetrated by straight bores 13 running parallel to one another, which form the straight-line channel sections for the cooling liquid.
  • Deflections 14 are formed in the side parts 11 and 12, with one deflection in each case being assigned to two adjacent channel sections 13.
  • the first deflection located in the rear grate area is connected to an inlet 15 and the last deflection located in the head area is connected to an outlet 16.
  • the coolant thus enters the inlet 15 and flows through the individual channel sections in sequence from the back to the front, each parallel to the surface of the grate element and transversely to the longitudinal direction of the grate element until it emerges again at the head region through the outlet 16.
  • the sections between the individual rectilinear channel sections 13 are selected differently, the channel sections lying much closer to one another in the head area than in the rear area of the grate element. This distribution is intended to take into account the higher thermal load on the grate element in the head area.
  • the reference number 17 denotes a temperature sensor for detecting the coolant temperature at the outlet 16.
  • 18 denotes air outlet openings which are designed as recesses which are open at the bottom of each grate element in order to be able to supply the primary combustion air supplied from below to the fuel lying on the grate elements . These air outlet openings are cleaned by clearing projections 19, which are provided in the rear region of the grate element back 9, from the jammed parts when the longest stroke is set.
  • the side parts 11 and 12 are shown explosively next to the main part 10. When the grate element is ready for operation, these side parts are firmly connected to the main part 10, which can be done, for example, by screws, not shown. In order to achieve the smoothest possible inner surface of the deflections 14, the side parts 11 and 12 can be divided so that the deflections 14 e.g. can be produced by milling.

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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)
  • Furnace Details (AREA)
  • Supporting Of Heads In Record-Carrier Devices (AREA)
  • Freezing, Cooling And Drying Of Foods (AREA)
  • Air Supply (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Thermotherapy And Cooling Therapy Devices (AREA)
  • Cooling Or The Like Of Electrical Apparatus (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Baking, Grill, Roasting (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)

Abstract

The component has at least one fluid feed channel (13,14) with parallel sections (13) and fluid inlet and outlet. The parallel sections of the channel run crossways to the component longitudinal direction and crossways to the combustible material conveyor direction. The channel sections run in a straight line and have a cross-section determining a compact, dead space-free flow. Two straight-line channel sections are joined by a linkage (14) and thus fluid flows through them in rows. The fluid inflow (15) is provided in the area of the fixture and drive end (5) and the fluid outflow (16) in the head area (7) of the grill component (1,2). All channel sections have a common fluid inlet and a common fluid outlet, with the fluid flowing through in a parallel manner.

Description

Die Erfindung bezieht sich auf ein Rostelement mit Flüssigkeitskühlung mit mindestens einem zur Führung der Flüssigkeit bestimmten Kanal mit parallelen Abschnitten sowie mit einem Flüssigkeitszulauf und einem Flüssigkeitsablauf. Die Erfindung betrifft auch einen aus solchen Rostelementen aufgebauten Rost.The invention relates to a grate element with liquid cooling with at least one channel intended for guiding the liquid with parallel sections and with a liquid inlet and a liquid outlet. The invention also relates to a grate constructed from such grate elements.

Rostelemente eines Rostes, der aus dachziegelartig übereinandergelegten und relativ zueinander bewegbaren Roststufen besteht, die aus einem oder mehreren nebeneinanderliegenden Rostelementen aufgebaut sind, sind hohen, stark schwankenden Wärmebelastungen, einem hohen mechanischen Abrieb und chemischen Angriffen ausgesetzt. Der Verschleiß eines Rostelementes hängt im wesentlichen von der Wärmebelastung ab, so daß in letzter Zeit flüssigkeitsgekühlte Rostelemente eingeführt werden, da man sich von der Flüssigkeitskühlung eine bessere Kühlung und gleichmäßigere Temperaturverteilung innerhalb des Rostelementes verspricht.Grate elements of a grate, which consists of grating steps that are stacked on top of one another and can be moved relative to one another and that are made up of one or more grating elements lying next to one another, are exposed to high, strongly fluctuating thermal loads, high mechanical abrasion and chemical attacks. The wear of a grate element essentially depends on the heat load, so that liquid-cooled grate elements have recently been introduced, since the liquid cooling promises better cooling and more uniform temperature distribution within the grate element.

Aus der EP-A-0 621 449 ist ein plattenförmiges Rostelement bekannt, das als hohler Blechkörper ausgeführt ist und einen Zulauf sowie einen Ablauf für Kühlwasser aufweist. Bei diesem bekannten Rostelement können auch Schikanen in dem Hohlkörper vorgesehen sein, um einen mäanderförmigen Durchlauf des Kühlwassers durch das Rostelement zu erzwingen. Der Zulauf und der Ablauf ist dabei im Bereich des Befestigungs- bzw. Antriebsendes des Rostelementes vorgesehen. Bei einem solchen Aufbau eines Rostelementes ergeben sich sehr große Strömungsquerschnitte und damit verbundene Toträume, Strömungsabrisse und unregelmäßige Verteilungen der Kühlflüssigkeit.From EP-A-0 621 449 a plate-shaped grate element is known which is designed as a hollow sheet metal body and has an inlet and an outlet for cooling water. In this known grate element, baffles can also be provided in the hollow body in order to force a meandering passage of the cooling water through the grate element. The inlet and the outlet are provided in the area of the fastening or drive end of the grate element. Such a construction of a grate element results in very large flow cross sections and the associated dead spaces, flow breaks and irregular distributions of the cooling liquid.

Außerdem sind solche Rostelemente nur ungenügend entlüftbar, so daß sich größere Luftansammlungen bilden können, die in diesem Bereich zu einer wesentlich schlechteren Kühlung und damit zu einer Überhitzung des Rostelementes führen. Dies ist insbesondere dann nachteilig, wenn die Rostelemente in einem Rückschubrost angeordnet sind, in welchem sich die Rostelementenköpfe aufgrund der geneigten Einbaulage an einer höheren Stelle als das jeweilige Befestigungs- bzw. Antriebsende des Rostelementes befinden. Bei einer solchen Einbaulage sammelt sich die im Rostelement vorhandene Luft dann im Kopfbereich des Rostelementes, der grundsätzlich unabhängig vom Rosttyp einer höheren Wärmebelastung ausgesetzt ist, so daß in Verbindung mit der durch Luftblasen bedingten schlechteren Kühlwirkung der Verschleiß des Rostelementes stark ansteigt. Außerdem können sich die als hohle Blechkörper ausgebildeten Rostelemente bei ungleichförmiger Kühlung verziehen und somit zu Störungen des Rostbetriebes führen. Die Anordnung des Zu- und Ablaufes für die Kühlflüssigkeit im hinteren Bereich des Rostelementes, das heißt in der Nähe des Befestigungs- bzw. Antriebsendes führt zu einer unbefriedigenden Temperaturerfassung des Kühlmittels, da sich die Zulauf- und Ablaufstellen im kühleren Bereich befinden und Temperaturfühler zweckmäßigerweise am Ablauf angebracht werden. Die weiter oben erläuterten, auf Luftblasen zurückzuführenden Überhitzungen, insbesondere des Kopfbereiches, können damit nur ungenügend erkannt werden.In addition, such grate elements are insufficiently ventilated, so that larger air accumulations can form, which in this area lead to significantly poorer cooling and thus to overheating of the grate element. This is particularly disadvantageous if the grate elements are arranged in a return grate in which the grate element heads are located at a higher point than the respective fastening or drive end of the grate element due to the inclined installation position. In such an installation position, the air present in the grate element then collects in the head region of the grate element, which is basically exposed to a higher thermal load regardless of the grate type, so that the wear of the grate element increases sharply in connection with the poorer cooling effect caused by air bubbles. In addition, the grate elements designed as hollow sheet metal bodies can warp in the event of non-uniform cooling and thus lead to malfunctions in grate operation. The arrangement of the inlet and outlet for the coolant in the rear area of the grate element, that is, in the vicinity of the fastening or drive end, leads to unsatisfactory temperature detection of the coolant, since the inlet and outlet points are in the cooler area and temperature sensors are expediently on Drain can be attached. The overheating, in particular of the head area, which can be attributed to air bubbles, explained above, can therefore only be recognized insufficiently.

Aus der DE-C-44 00 992 ist ein flüssigkeitsgekühlter Roststab bekannt, der mindestens einen Kanal aufweist, dessen Abschnitte in Längsrichtung des Roststabes parallel zueinander verlaufen und mit einer Umlenkung im Kopfbereich des Roststabes in Verbindung stehen. Der Zu- und Ablauf für diesen Kanal befindet sich auch bei diesem bekannten Roststab im hinteren Bereich, das heißt im Bereich des Befestigungs- bzw. Antriebsendes, so daß auch hier grundsätzlich ähnliche Nachteile wie bei dem zuerst genannten plattenförmigen Rostelement auftreten. Auch bei diesem bekannten Roststab, der einen im Querschnitt im wesentlichen rechteckigen Kanal und einen abknickenden Verlauf zur Umlenkung im Kopfbereich aufweist, können Strömungsabrisse oder Wirbel und Luftansammlungen nicht mit Sicherheit vermieden werden. Da neben dem Zulauf auch der Ablauf im hinteren Bereich des Roststabes vorgesehen ist, ist nicht nur die Temperaturerfassung, wie bereits beschrieben, ungenügend, sondern auch die Entlüftung, das heißt die Abführung eventuell gebildeter Luftblasen aus dem Kopfbereich gestaltet sich äußerst schwierig.From DE-C-44 00 992 a liquid-cooled grate bar is known which has at least one channel, the sections of which run parallel to one another in the longitudinal direction of the grate bar and are connected to a deflection in the head region of the grate bar. The inlet and outlet for this channel is also in this known grate bar in the rear area, that is in the area of the fastening or drive end, so that here, too, basically similar disadvantages occur as with the plate-shaped grate element mentioned first. Even with this known grate bar, which has a channel which is essentially rectangular in cross section and a kinking course for deflection in the head region, flow breaks or vortices and air accumulations cannot be carried out with certainty be avoided. Since, in addition to the inlet, the outlet is also provided in the rear area of the grate bar, not only is the temperature detection, as already described, inadequate, but also the ventilation, that is to say the removal of any air bubbles which may have formed, is extremely difficult.

Aufgabe der Erfindung ist es, ein Rostelement mit Flüssigkeitskühlung der weiter oben angegebenen Art so auszugestalten, daß eine gezielte, den jeweiligen Verhältnissen angepaßte Kühlung des Rostelementes bei geringem konstruktiven und regelungstechnischen Aufwand möglich ist.The object of the invention is to design a grate element with liquid cooling of the type specified above in such a way that a targeted cooling of the grate element which is adapted to the respective conditions is possible with little design and control expenditure.

Diese Aufgabe wird ausgehend von einem Rostelement der eingangs erläuterten Art erfindungsgemäß dadurch gelöst, daß die parallelen Abschnitte des Kanals quer zur Rostelementenlängsrichtung und damit quer zur Brenngutförderrichtung verlaufen, daß die Kanalabschnitte geradlinig verlaufen und einen, eine kompakte, abrißfreie und totraumfreie Strömung bedingenden Querschnitt aufweisen.Starting from a grate element of the type described in the introduction, this object is achieved according to the invention in that the parallel sections of the channel run transversely to the grate element longitudinal direction and thus transversely to the firing material conveying direction, that the channel sections run in a straight line and have a cross section which requires a compact, tear-free and dead space-free flow.

Durch die Ausbildung der Kanalabschnitte quer zur Längsrichtung des Rostelementes in Verbindung mit engen Querschnitten wird die Gefahr der Ansammlung von Luftblasen oder Dampfblasen vermieden, da jeder Abschnitt eines Kanales auf der gleichen Höhenebene liegt, wodurch höher gelegene Hohlräume, die zum Teil nicht zwangsweise durchspült werden, vermieden werden, in denen sich Luftblasen ansammeln können, während durch die Wahl eines engen Querschnittes eine kompakte, abrißfreie und totraumfreie Strömung im gesamten Querschnitt erzeugt wird, die zu einem besseren Abtransport eventuell sich gebildeter Luftblasen führt, als wenn eine inhomogene Strömung mit Toträumen in großen Räumen vorliegen würde. Dabei wird unter Berücksichtigung des notwendigen Wärmeabtransportes eine Reynoldssche Zahl von größer als 10.000 eingestellt.The formation of the channel sections transversely to the longitudinal direction of the grate element in connection with narrow cross sections avoids the risk of the accumulation of air bubbles or vapor bubbles, since each section of a channel lies at the same level, which means that higher-lying cavities, some of which are not necessarily flushed through, in which air bubbles can accumulate, while the choice of a narrow cross section produces a compact, tear-free and dead space-free flow in the entire cross section, which leads to a better removal of any air bubbles that may have formed than if an inhomogeneous flow with dead spaces in large Would be available. A Reynolds number greater than 10,000 is set taking into account the necessary heat removal.

Eine vorteilhafte Ausgestaltung sieht vor, daß jeweils zwei geradlinige Kanalabschnitte durch eine Umlenkung verbunden sind und somit in Reihe von der Flüssigkeit beströmbar sind und daß der Flüssigkeitszulauf im Bereich des Befestigungs- bzw. Antriebsendes und der Flüssigkeitsablauf im Kopfbereich des Rostelementes vorgesehen ist. Durch die Anordnung des Flüssigkeitszulaufes am hinteren, kühleren Ende des Rostelementes und die Anordnung des Flüssigkeitsablaufes im Kopfbereich, das heißt am heißeren Ende des Rostelementes, tritt eine Temperaturerhöhung des Kühlmittels entsprechend der in Längsrichtung des Rostelementes auftretenden Temperaturerhöhung ein, so daß das sich erwärmende Kühlmedium nach Erreichen der höchsten Temperatur an der heißesten Stelle des Roststabes abgeführt wird und somit die Voraussetzung für eine den tatsächlichen Verhältnissen entsprechende Temperaturerfassung des Rostelementes geschaffen wird. Ein wesentlicher Vorteil besteht darin, daß bei dieser Anordnung des Zulaufes und des Ablaufes in Verbindung mit der bereits erläuterten Querdurchströmung des Rostelementes die Temperaturverteilung des Rostelementes an einer bestimmten Querschnittsstelle weitgehend gleichförmig ist, das heißt, es werden Temperaturschwankungen zwischen den beiden Flanken eines Rostelementes vermieden. Dies ist insbesondere bei solchen Rostelementen besonders vorteilhaft, die sich über die gesamte Rostbreite erstrecken und somit einen sehr langen Weg für das Kühlmedium aufweisen. Bei dem bekannten, plattenförmige Rostelement, bei dem auf der einen Seite der kühlere Zufluß und auf der anderen Seite der weitaus wärmere Abfluß angeordnet ist, wird derjenige Randbereich des Rostelementes, dem der Ablauf zugeordnet ist wärmer sein als der Rand- bzw. Flankenbereich des Rostelementes, dem der Zulauf zugeordnet ist. Dies kann bei sehr breiten und aus hohlen Blechkörpern bestehenden Rostelementen zu Verwindungen des Rostelementes führen. Solche Erscheinungen werden durch die erfindungsgemäße Ausgestaltung vermieden.An advantageous embodiment provides that in each case two rectilinear channel sections are connected by a deflection and can therefore be flowed through by the liquid in series and that the liquid inlet in the area of the fastening or drive end and the Liquid drain is provided in the head area of the grate element. Due to the arrangement of the liquid inlet at the rear, cooler end of the grate element and the arrangement of the liquid outlet in the head region, that is, at the hotter end of the grate element, a temperature increase of the coolant occurs in accordance with the temperature increase occurring in the longitudinal direction of the grate element, so that the warming cooling medium follows Reaching the highest temperature at the hottest point of the grate bar is dissipated and thus the prerequisite for a temperature detection of the grate element corresponding to the actual conditions is created. A major advantage is that with this arrangement of the inlet and the outlet in connection with the cross-flow of the grate element already explained, the temperature distribution of the grate element at a certain cross-sectional location is largely uniform, i.e. temperature fluctuations between the two flanks of a grate element are avoided. This is particularly advantageous in the case of grate elements which extend over the entire grate width and thus have a very long path for the cooling medium. In the known, plate-shaped grate element in which the cooler inflow and on the other side the much warmer outflow is arranged, the edge region of the grate element to which the drain is assigned will be warmer than the edge or flank region of the grate element to which the inlet is assigned. This can lead to twisting of the grate element in the case of very wide grate elements consisting of hollow sheet metal bodies. Such phenomena are avoided by the configuration according to the invention.

Es ist aber auch möglich, daß sämtliche Kanalabschnitte einen gemeinsamen Flüssigkeitszulauf und einen gemeinsamen Flüssigkeitsablauf aufweisen und somit parallel von der Flüssigkeit durchströmbar sind.However, it is also possible for all the channel sections to have a common liquid inlet and a common liquid outlet and thus the liquid can flow through them in parallel.

Eine vorteilhafte Ausgestaltung besteht darin, daß die Kanalabschnitte einen kreisförmigen Querschnitt mit einem Durchmesser von 5 bis 25 mm aufweisen.An advantageous embodiment consists in that the channel sections have a circular cross section with a diameter of 5 to 25 mm.

Bei Querschnitten, die von der Kreisform abweichen, ist es vorteilhaft, wenn die Kanalabschnitte einen engen Querschnitt von 20 bis 500 mm2 aufweisen.In the case of cross sections that deviate from the circular shape, it is advantageous if the channel sections have a narrow cross section of 20 to 500 mm 2 .

Eine bevorzugte Ausgestaltung der Erfindung besteht darin, daß das Rostelement aus einem massiven, druckfesten plattenförmigen Hauptteil und beidseitig befestigten schmalen, massiven, druckfesten Seitenteilen besteht und daß das Hauptteil die geradlinigen Kanalabschnitte und die Seitenteile die Umlenkungen aufweisen. Aufgrund dieser Ausgestaltung ist es möglich, das Hauptteil des Rostelementes aus einer massiven Stahlplatte durch Einbringen entsprechender durchgehender Bohrungen herzustellen, wobei die daran befestigten Seitenteile die Umlenkungen aufweisen. Hierbei können die Seitenteile jeweils einteilig gegossen oder zweiteilig aus gewalztem Stahl hergestellt sein, um die Umlenkungen beispielsweise durch Fräsen herzustellen, was die Herstellung besonders glatter Innenwände der Umlenkungen gestattet. Im Hinblick auf eine möglichst kompakte, abrißfreie und totraumfreie Strömung ist es vorteilhaft, daß der Kanal Insgesamt eine glatte durch Feinbearbeitung hergestellte Innenwand aufweist, was sich durch die Herstellung der geradlinigen Kanalabschnitte durch Bohren und die Herstellung der Umlenkungen durch Fräsen bewerkstelligen läßt.A preferred embodiment of the invention is that the grate element consists of a solid, pressure-resistant plate-shaped main part and narrow, solid, pressure-resistant side parts fastened on both sides, and that the main part has the rectilinear channel sections and the side parts have the deflections. Because of this configuration, it is possible to manufacture the main part of the grate element from a solid steel plate by introducing corresponding through bores, the side parts attached to it having the deflections. Here, the side parts can each be cast in one piece or made in two parts from rolled steel in order to produce the deflections, for example by milling, which allows the production of particularly smooth inner walls of the deflections. With regard to a flow that is as compact, tear-free and dead space-free as possible, it is advantageous that the channel as a whole has a smooth inner wall produced by fine machining, which can be achieved by drilling the straight-line channel sections and producing the deflections by milling.

Um der unterschiedlichen Temperaturverteilung in Längsrichtung des Rostelementes, das heißt in Richtung vom Befestigungs- bzw. Antriebsende zum Kopfende hin Rechnung zu tragen, können die Abstände zwischen den Kanalabschnitten im Kopfbereich am geringsten und in Richtung auf das Befestigungs- bzw. Antriebsende größer sein.In order to take into account the different temperature distribution in the longitudinal direction of the grate element, that is to say in the direction from the fastening or drive end to the head end, the distances between the channel sections in the head region can be the smallest and larger in the direction of the fastening or drive end.

Wenn in weiterer Ausgestaltung der Erfindung am Auslauf ein Temperaturfühler zur Regelung der Kühlmitteltemperatur durch Veränderung der Strömungsgeschwindigkeit und/oder des Druckes des Kühlmittels vorgesehen ist, so kann aufgrund der Tatsache, daß der Auslauf im Kopfbereich, also im heißesten Bereich des Roststabes liegt, eine besonders feinfühlige Regelung durchgeführt werden, da durch diese Ausgestaltung die heißeste Temperatur des Kühlmediums und des Roststabes erfaßt werden kann, was bei der Anordnung des Auslaufes am rückwärtigen Ende des Rostelementes nicht mit dieser Genauigkeit möglich ist. Die Veränderung des Druckes des Kühlmediums ist in einem in sich geschlossenen System im Bereich der Siedetemperatur des Kühlmittels notwendig, um diese zur Vermeidung von Dampfblasen hinaufzusetzen. Die Anordnung eines Temperaturfühlers im Auslauf hat den Vorteil, daß beispielsweise die notwendige Zuführungsleitung innerhalb der Ablaufleitung des Kühlmediums verlegt werden kann, wodurch diese Zuführungsleitung besonders gut geschützt ist. Freiliegende Zuführungsleitungen zu Temperaturfühlern an Roststäben unterliegen bei diesem rauhen Betrieb häufig der Gefahr von Zerstörungen.If, in a further embodiment of the invention, a temperature sensor for regulating the coolant temperature by changing the flow rate and / or the pressure of the coolant is provided at the outlet, it can be particularly due to the fact that the outlet lies in the head region, that is to say in the hottest region of the grate bar sensitive control can be carried out, since the hottest temperature of the cooling medium and the grate bar can be detected by this configuration, which in the arrangement of the outlet is not possible with this accuracy at the rear end of the grate element. The change in the pressure of the cooling medium is necessary in a self-contained system in the range of the boiling point of the coolant in order to increase it to avoid vapor bubbles. The arrangement of a temperature sensor in the outlet has the advantage that, for example, the necessary feed line can be laid within the drain line of the cooling medium, as a result of which this feed line is particularly well protected. Exposed supply lines to temperature sensors on grate bars are often subject to the risk of destruction during this rough operation.

Aufgrund der quer zur Längsrichtung des Rostelementes verlaufender Kanalabschnitte, die geradlinig sind und wodurch keine Schleifenbildungen im Kopfbereich vorliegen, können im Kopfbereich Luftaustrittsöffnungen für die von unterhalb des aus stufenförmig übereinander angeordneten Rostelemeten gebildeten Feuerungsrostes zugeführte Primärverbrennungsluft vorgesehen sein, ohne daß irgendwelche besondere Vorkehrungen für die Ausbildung solcher Luftaustrittsöffnungen getroffen werden müßten.Due to the duct sections running transversely to the longitudinal direction of the grate element, which are straight and which means that no loops are formed in the head area, air outlet openings can be provided in the head area for the combustion grate formed from the grate grate formed below the grate elements arranged one above the other without any special precautions for the training such air outlet openings would have to be made.

Ein Rost für Verbrennungsanlagen mit in Brenngutförderrichtung hintereinanderliegenden, einander dachziegelartig übergreifenden, sowie abwechselnd bewegbaren und feststehenden Roststufen, die aus einzelnen über die gesamte Rostbreite reichenden oder aus mehreren nebeneinanderliegenden Rostelementen gemäß einem der Ansprüche 1 bis 11 aufgebaut ist, ist dadurch gekennzeichnet, daß jede Roststufe einem eigenen regelbaren Kühlflüssigkeitskreislauf zugeordnet ist. Für den Fall, daß jede Roststufe aus mehreren Rostelementen aufgebaut ist, können diese entweder in Reihenschaltung oder in Parallelschaltung von der Kühlflüssigkeit beaufschlagt werden.A grate for incineration plants with grate steps one behind the other in the firing material conveying direction, overlapping one another like roof tiles, and alternately movable and fixed grate steps, which is constructed from individual grate elements that extend over the entire grate width or from several grate elements lying next to one another according to one of claims 1 to 11, is characterized in that each grate step is assigned its own controllable coolant circuit. In the event that each grate stage is constructed from several grate elements, these can be acted upon by the cooling liquid either in series or in parallel.

Eine besonders günstige Regelungsmöglichkeit der Temperatur der Kühlflüssigkeit und damit des Rostelementes ergibt sich dadurch, daß bei mehreren Rostelementen einer Roststufe jedes Rostelement einem eigenen regelbaren Kühlflüssigkeitskreislauf zugeordnet ist.A particularly favorable possibility of regulating the temperature of the cooling liquid and thus of the grate element results from the fact that in the case of several grate elements of a grate level, each grate element is assigned its own controllable coolant circuit.

Zur Vereinfachung des baulichen Aufwandes und insbesondere des regelungstechnischen Aufwandes ist vorgesehen, daß mindestens zwei hintereinanderliegende Roststufen einem eigenen Kühlflüssigkeitskreislauf zugeordnet sind.In order to simplify the structural complexity and, in particular, the complexity of the control technology, it is provided that at least two grate stages located one behind the other are assigned to their own coolant circuit.

Die Erfindung wird nachstehend anhand eines in der Zeichnung dargestellten Ausführungsbeispieles näher erläutert, deren einzige eine schaubildliche Darstellung zweier dachziegelartig übereinanderliegender Rostelemente nach der Erfindung zeigt.The invention is explained in more detail below on the basis of an exemplary embodiment shown in the drawing, the only one of which shows a diagrammatic representation of two grate elements according to the invention lying one above the other in the manner of roof tiles.

Wie aus der Zeichnung ersichtlich, ist ein Rost aus mehreren, dachziegelartig übereinandergreifenden Rostelementen 1 und 2 aufgebaut, von denen die Rostelemente 1 in Richtung des Doppelpfeiles 3 hin und her bewegbar und die Rostelemente 2 feststehend angeordnet sind. Die Rostelemente 1 sind einer Antriebseinrichtung 4 zugeordnet, die den erforderlichen Hub erzeugt. Jedes Rostelement weist ein Befestigungs- bzw. Antriebsende 5 auf, das in einer Halterung 6 eingehängt ist, wobei diese Halterung 6 im Falle der angetriebenen Rostelemente mit der Antriebseinrichtung 4 fest verbunden ist. Weiterhin weist jedes Rostelement ein Kopfende 7 und einen Rücken 9 auf.As can be seen from the drawing, a grate is constructed from a plurality of grate elements 1 and 2, which overlap like roof tiles, of which the grate elements 1 can be moved back and forth in the direction of the double arrow 3 and the grate elements 2 are arranged in a fixed manner. The grate elements 1 are assigned to a drive device 4, which generates the required stroke. Each grate element has a fastening or drive end 5 which is suspended in a holder 6, this holder 6 being firmly connected to the drive device 4 in the case of the driven grate elements. Furthermore, each grate element has a head end 7 and a back 9.

Bei dem in der Zeichnung dargestellten Ausführungsbeispiel ist jedes Rostelement 1 bzw. 2 dreiteilig aufgebaut und besteht aus einem Hauptteil 10 und zwei Seitenteilen 11 und 12. Das Hauptteil 10 besteht aus einer massiven, druckfesten Platte, die quer zur Längsrichtung, das heißt quer zur Förderrichtung des Brenngutes von parallel zueinander laufenden geradlinigen Bohrungen 13 durchsetzt ist, die die geradlinigen Kanalabschnitte für die Kühlflüssigkeit bilden. In den Seitenteilen 11 und 12 sind Umlenkungen 14 ausgebildet, wobei jeweils eine Umlenkung zwei benachbarten Kanalabschnitten 13 zugeordnet ist. Die im hinteren Rostbereich liegende erste Umlenkung ist mit einem Zulauf 15 und die letzte im Kopfbereich liegende Umlenkung ist mit einem Ablauf 16 verbunden. Die Kühlflüssigkeit tritt also beim Zulauf 15 ein und durchströmt die einzelnen Kanalabschnitte der Reihe nach von hinten nach vorne jeweils parallel zur Oberfläche des Rostelementes und quer zur Längsrichtung des Rostelementes bis sie am Kopfbereich durch den Auslauf 16 wieder austritt. Dabei sind entsprechend der Temperaturverteilung in Längsrichtung des Rostelementes, also vom Befestigungsende bzw. vom Antriebsende 5 aus gesehen in Richtung auf das Kopfende 7 die Abschnitte zwischen den einzelnen geradlinigen Kanalabschnitten 13 unterschiedlich gewählt, wobei die Kanalabschnitte im Kopfbereich wesentlich dichter nebeneinanderliegen als im rückwärtigen Bereich des Rostelementes. Diese Verteilung ist vorgesehen, um der höheren Wärmebelastung des Rostelementes im Kopfbereich Rechnung zu tragen. Die Bezugszahl 17 bezeichnet einen Temperaturfühler für die Erfassung der Kühlmitteltemperatur am Auslauf 16. Mit 18 sind Luftaustrittsöffnungen bezeichnet, die als nach unten offene Aussparungen am Fuß eines jeden Rostelementes ausgebildet sind, um die von unten zugeführte Primärverbrennungsluft dem auf den Rostelementen liegenden Brennstoff zuführen zu können. Diese Luftaustrittsöffnungen werden durch Räumvorsprünge 19, die im hinteren Bereich des Rostelementenrückens 9 vorgesehen sind, bei Einstellung des längsten Hubes von festgeklemmten Teilen gereinigt.In the embodiment shown in the drawing, each grate element 1 or 2 is constructed in three parts and consists of a main part 10 and two side parts 11 and 12. The main part 10 consists of a solid, pressure-resistant plate which is transverse to the longitudinal direction, that is to say transversely to the conveying direction of the combustible material is penetrated by straight bores 13 running parallel to one another, which form the straight-line channel sections for the cooling liquid. Deflections 14 are formed in the side parts 11 and 12, with one deflection in each case being assigned to two adjacent channel sections 13. The first deflection located in the rear grate area is connected to an inlet 15 and the last deflection located in the head area is connected to an outlet 16. The coolant thus enters the inlet 15 and flows through the individual channel sections in sequence from the back to the front, each parallel to the surface of the grate element and transversely to the longitudinal direction of the grate element until it emerges again at the head region through the outlet 16. Thereby are corresponding the temperature distribution in the longitudinal direction of the grate element, i.e. viewed from the fastening end or from the drive end 5 in the direction of the head end 7, the sections between the individual rectilinear channel sections 13 are selected differently, the channel sections lying much closer to one another in the head area than in the rear area of the grate element. This distribution is intended to take into account the higher thermal load on the grate element in the head area. The reference number 17 denotes a temperature sensor for detecting the coolant temperature at the outlet 16. 18 denotes air outlet openings which are designed as recesses which are open at the bottom of each grate element in order to be able to supply the primary combustion air supplied from below to the fuel lying on the grate elements . These air outlet openings are cleaned by clearing projections 19, which are provided in the rear region of the grate element back 9, from the jammed parts when the longest stroke is set.

In der Zeichnung sind die Seitenteile 11 und 12 explosionsartig neben dem Hauptteil 10 dargestellt. Bei dem betriebsbereiten Rostelement sind diese Seitenteile fest mit dem Hauptteil 10 verbunden, was beispielsweise durch nicht dargestellte Schrauben erfolgen kann. Um eine möglichst glatte Innenoberfläche der Umlenkungen 14 zu erzielen, können die Seitenteile 11 und 12 geteilt ausgeführt werden, damit die Umlenkungen 14 z.B. durch Fräsen hergestellt werden können.In the drawing, the side parts 11 and 12 are shown explosively next to the main part 10. When the grate element is ready for operation, these side parts are firmly connected to the main part 10, which can be done, for example, by screws, not shown. In order to achieve the smoothest possible inner surface of the deflections 14, the side parts 11 and 12 can be divided so that the deflections 14 e.g. can be produced by milling.

Claims (14)

Rostelement mit Flüssigkeitskühlung mit mindestens einem zur Führung der Flüssigkeit bestimmten Kanal mit parallelen Abschnitten sowie mit einem Flüssigkeitszulauf und einem Flüssigkeitsablauf, dadurch gekennzeichnet, daß die parallelen Abschnitte (13) des Kanales (13, 14) quer zur Rostelementenlängsrichtung und damit quer zur Brenngutförderrichtung verlaufen, daß die Kanalabschnitte (13) geradlinig verlaufen und einen eine kompakte, abrißfreie und totraumfreie Strömung bedingenden Querschnitt aufweisen.Grate element with liquid cooling with at least one channel intended for guiding the liquid with parallel sections and with a liquid inlet and a liquid outlet, characterized in that the parallel sections (13) of the channel (13, 14) run transversely to the grate element longitudinal direction and thus transversely to the firing material conveying direction, that the channel sections (13) run rectilinearly and have a cross section which requires a compact, tear-free and dead space-free flow. Rostelement nach Anspruch 1, dadurch gekennzeichnet, daß jeweils zwei geradlinige Kanalabschnitte (13) durch eine Umlenkung (14) verbunden sind und somit in Reihe von der Flüssigkeit durchströmbar sind und daß der Flüssigkeitszulauf (15) im Bereich des Befestigungs- bzw. Antriebsendes (5) und der Flüssigkeitsablauf (16) im Kopfbereich (7) des Rostelementes (1, 2) vorgesehen ist.Grate element according to claim 1, characterized in that in each case two rectilinear channel sections (13) are connected by a deflection (14) and thus the liquid can flow through them in series, and in that the liquid inlet (15) in the region of the fastening or drive end (5th ) and the liquid drain (16) in the head region (7) of the grate element (1, 2) is provided. Rostelement nach Anspruch 1, dadurch gekennzeichnet, daß sämtliche Kanalabschnitte (13) einen gemeinsamen Flüssigkeitszulauf und einen gemeinsamen Flüssigkeitsablauf aufweisen und somit parallel von der Flüssigkeit durchströmbar sind.Grate element according to claim 1, characterized in that all the channel sections (13) have a common liquid inlet and a common liquid outlet and thus the liquid can flow through them in parallel. Rostelement nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Kanalabschnitte (13) einen kreisförmigen Querschnitt mit einem Durchmesser von 5 bis 25 mm aufweisen.Grate element according to one of claims 1 to 3, characterized in that the channel sections (13) have a circular cross section with a diameter of 5 to 25 mm. Rostelement nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Kanalabschnitte (13) einen engen Querschnitt von 20 bis 500 mm2 aufweisen.Grate element according to one of claims 1 to 3, characterized in that the channel sections (13) have a narrow cross section of 20 to 500 mm 2 . Rostelement nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß es aus einem massiven, druckfesten, plattenförmigen Hauptteil (10) und beidseitig befestigten schmalen, massiven, druckfesten Seitenteilen (11, 12) besteht und daß das Hauptteil (10) die geradlinigen Kanalabschnitte (13) und die Seitenteile (11, 12) die Umlenkungen (14) aufweisen.Grate element according to one of claims 1 to 5, characterized in that it consists of a solid, pressure-resistant, plate-shaped main part (10) and narrow, solid, pressure-resistant side parts (11, 12) fastened on both sides and that the main part (10) comprises the rectilinear channel sections (13) and the side parts (11, 12) have the deflections (14). Rostelement nach einem der Ansprüche 4 bis 6, dadurch gekennzeichnet, daß die geraden Kanalabschnitte (13) durch durchgehende Bohrungen im Hauptteil (10) gebildet sind.Grate element according to one of claims 4 to 6, characterized in that the straight channel sections (13) are formed by through bores in the main part (10). Rostelement nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß der Kanal (13, 14) eine glatte durch Feinbearbeitung hergestellte Innenwand aufweist.Grate element according to one of claims 1 to 7, characterized in that the channel (13, 14) has a smooth inner wall produced by fine machining. Rostelement nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß die Abstände zwischen den Kanalabschnitten (13) im Kopfbereich (7) am geringsten sind und in Richtung auf das Befestigungs- bzw. Antriebsende (5) größer sind.Grate element according to one of claims 1 to 8, characterized in that the distances between the channel sections (13) in the head region (7) are the smallest and are larger in the direction of the fastening or drive end (5). Rostelement nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß am Auslauf (16) ein Temperaturfühler (17) zur Regelung der Kühlmitteltemperatur durch Veränderung der Strömungsgeschwindigkeit und/oder des Druckes des Kühlmittels vorgesehen ist.Grate element according to one of claims 1 to 9, characterized in that a temperature sensor (17) for regulating the coolant temperature by changing the flow rate and / or the pressure of the coolant is provided at the outlet (16). Rostelement nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, daß im Kopfbereich (7) Luftaustrittsöffnungen (18) für die von unterhalb des aus stufenförmig übereinander angeordneten Rostelementen (1, 2) gebildeten Rostes zugeführte Primärverbrennungsluft vorgesehen sind.Grate element according to one of Claims 1 to 10, characterized in that air outlet openings (18) are provided in the head region (7) for the primary combustion air supplied from the grate formed below the grate elements (1, 2) arranged one above the other in steps. Rost für Verbrennungsanlagen mit in Brenngutförderrichtung hintereinanderliegenden, einander dachziegelartig übergreifenden sowie abwechselnd bewegbaren und feststehenden Roststufen, die aus einzelnen über die gesamte Rostbreite reichenden oder aus mehreren nebeneinanderliegenden Rostelementen gemäß einem der Ansprüche 1 bis 11 aufgebaut ist, dadurch gekennzeichnet, daß jede Roststufe einem eigenen regelbaren Kühlflüssigkeitskreislauf zugeordnet ist.Grate for incinerators with consecutive roof tiles and overlapping one another in the conveying direction of the firing material alternately movable and fixed grate stages, which are constructed from individual grate elements which extend over the entire grate width or from a plurality of grate elements lying side by side according to one of claims 1 to 11, characterized in that each grate stage is assigned its own controllable coolant circuit. Rost nach Anspruch 12, dadurch gekennzeichnet, daß bei mehreren Rostelementen (1 bzw. 2) einer Roststufe jedes Rostelement einem eigenen regelbaren Kühlflüssigkeitskreislauf zugeordnet ist.Grate according to claim 12, characterized in that in the case of several grate elements (1 or 2) of a grate level, each grate element is assigned its own controllable coolant circuit. Rost nach Anspruch 12, dadurch gekennzeichnet, daß mindestens zwei hintereinanderliegende Roststufen einem eigenen Kühlflüssigkeitskreislauf zugeordnet sind.Grate according to claim 12, characterized in that at least two grate stages lying one behind the other are assigned to their own coolant circuit.
EP97108567A 1996-06-04 1997-05-28 Grate element with liquid-cooling Expired - Lifetime EP0811803B1 (en)

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Cited By (12)

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Publication number Priority date Publication date Assignee Title
EP0924464A1 (en) * 1997-12-19 1999-06-23 KOCH, Theodor Grate for a combustion plant and method for its cooling
WO1999032830A1 (en) 1997-12-19 1999-07-01 Theodor Koch Grate bar for a combustion grate, and method for cooling the same
DE19881971B4 (en) * 1997-12-19 2014-10-09 MH Power Systems Europe Service GmbH Grate bar for combustion grate and method for its cooling
EP1035373A1 (en) 1999-03-10 2000-09-13 Teset Ag Grate system for a fuel fired boiler
DE19910425A1 (en) * 1999-03-10 2000-09-21 Teset Ag Weismes Waimes Grate system for a fuel boiler
DE19910425C2 (en) * 1999-03-10 2000-12-28 Teset Ag Weismes Waimes Grate system for a fuel boiler
WO2002021049A1 (en) 2000-09-04 2002-03-14 Theodor Koch Grate bar with liquid cooling for incinerators
EP1355112A1 (en) 2002-04-17 2003-10-22 Seghers Keppel Technology Group Grate bar, method for its cooling and process for its production
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
WO2018166587A1 (en) * 2017-03-15 2018-09-20 Seko-Patent Gmbh Grate bar, grate, and combustion system
EP3779278A1 (en) * 2019-08-13 2021-02-17 Saretco Grid unit with tier for furnace grate of an incinerator, and corresponding support
FR3099949A1 (en) * 2019-08-13 2021-02-19 Saretco Stepped grate block for incinerator furnace hearth, and corresponding support

Also Published As

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PL320322A1 (en) 1997-12-08
DK0811803T3 (en) 2005-11-07
RU2119126C1 (en) 1998-09-20
CA2206727C (en) 2001-02-20
ES2112229T3 (en) 2006-02-01
ATE300017T1 (en) 2005-08-15
TW340171B (en) 1998-09-11
CA2206727A1 (en) 1997-12-04
CZ168697A3 (en) 1997-12-17
ES2112229T1 (en) 1998-04-01
DE59706724D1 (en) 2002-05-02
NO310485B1 (en) 2001-07-09
PL183140B1 (en) 2002-05-31
SI0811803T1 (en) 2005-12-31
EP0811803B1 (en) 2005-07-20
EP0811803A3 (en) 1999-03-31
BR9703442A (en) 1998-09-01
JP3027727B2 (en) 2000-04-04
DE19622424C2 (en) 1998-10-29
NO972545L (en) 1997-12-05
CZ290409B6 (en) 2002-07-17
JPH1082516A (en) 1998-03-31
US5899150A (en) 1999-05-04
NO972545D0 (en) 1997-06-04
DE19622424A1 (en) 1997-12-11

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