EP0921354B1 - Liquid cooled grate plate - Google Patents

Liquid cooled grate plate Download PDF

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Publication number
EP0921354B1
EP0921354B1 EP98122738A EP98122738A EP0921354B1 EP 0921354 B1 EP0921354 B1 EP 0921354B1 EP 98122738 A EP98122738 A EP 98122738A EP 98122738 A EP98122738 A EP 98122738A EP 0921354 B1 EP0921354 B1 EP 0921354B1
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EP
European Patent Office
Prior art keywords
grate
coolant
panel according
grate panel
connection
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP98122738A
Other languages
German (de)
French (fr)
Other versions
EP0921354A1 (en
Inventor
Hans Ulrich Sachs
Gerhard Schroth
Gerhard Heinz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AE & E INOVA GMBH, KOELN
Original Assignee
Alstom Power Boiler GmbH
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Publication date
Application filed by Alstom Power Boiler GmbH filed Critical Alstom Power Boiler GmbH
Publication of EP0921354A1 publication Critical patent/EP0921354A1/en
Application granted granted Critical
Publication of EP0921354B1 publication Critical patent/EP0921354B1/en
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Classifications

    • 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
    • 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
    • F23H2900/00—Special features of combustion grates
    • F23H2900/03021—Liquid cooled grates

Definitions

  • the invention relates to a grate plate with the Features of the preamble of claim 1.
  • feed grates For the combustion of solids are particularly in Waste incineration plants ovens with so-called feed grates in use, which absorb the material to be burned and give it a feed motion.
  • the feed grates are formed by grate bars or plates, of some of which are stationary and others in groups back and forth in a feed direction or be moved against this.
  • the entire rust is usually covered by many side by side and one behind the other grate bars or Plates formed. Through in the grate bars or plates provided slotted nozzles flows in combustion air the combustion material lying on the grate.
  • the grate plates or rods heat up during the Operating through the burning on the grate plates Solids considerably.
  • the through the slots flowing combustion air can, especially since it is mostly preheated is or for combustion reasons is subject to a quantity limitation, only a small one Effect cooling effect.
  • the temperature of uncooled grate plates or rods is therefore relatively high, resulting in a severe chemical corrosion and mechanical Wear of the grate plates. This is understandable undesirable.
  • grate plates For both reasons it is necessary to have grate plates to cool during operation or in a constant Keep temperature range.
  • a grate plate which covers the stretches the entire width of the grate.
  • the grate plate has many extending in parallel in the longitudinal direction Cooling channels on the ends to collect channels to lead.
  • EP 0621449 B1 is a grate plate with a meandering shape Cooling channel known. This leads across to the Grate plate and thus across to the feed direction the grate plate. Individual sections of the meandering Coolant channels are each in the longitudinal direction oriented.
  • EP 0 757 206 A2 describes a grate for a furnace with at least one a grate track with several alternating in the longitudinal direction, on both sides of Sidewalls delimited rows of fixed bars and rows of moving bars become known liquid-cooled grate plates.
  • the grate plates are with one Large number of openings or slots arranged in groups for Provide primary air supply.
  • the grate plates with cooling channels are for liquid cooling formed, which are provided on the underside of the grate plate and lie between the openings or slots and these cooling channels on the one hand through the grate plate itself and on the other hand through to the grate plate attached hollow profiles are formed.
  • the liquid supply or discharge nozzles are either on the side of the narrow side of the grate plate or something indented or arranged at the front and rear end of the grate plate so that the cooling medium flows through the grate plate from one side to the other.
  • This task is with a grate plate according to claim 1 with one on the thermal load of the Grid plate orientated cooling system solved.
  • a coolant channel provided a central coolant connection has, while the connections at the state of Technology are usually arranged on the side.
  • the coolant channel leads from here to peripheral grate plate areas where the coolant from or is supplied.
  • the grate plate By heating the coolant along the Coolant channel creates a heat gradient along the Coolant channel.
  • the grate plate is in operation from above heated up, there is a heat gradient of the central connection to the peripheral peripheral areas the grate plate, or vice versa. In any case, it is Heat distribution more or less symmetrical.
  • the grate plate can flow in the center of the coolant flow or be cooled more at the edge. In any case but is the temperature distribution with respect to a longitudinal median plane essentially symmetrical. So that will be Expansion behavior and thus also the thermal stress distribution the grate plate by cooling the center of gravity improved. There can be faults and thus the Formation of free cross sections between neighboring ones Rust bars or plates or jamming of moving Rust plates can be avoided.
  • the grate plate is especially for feed grates intended. To do this, it has a lanyard at one end provided with which they with a grate plate carrier is connectable. This is, for example, a round bar or any other carrier. On their opposite At the end, the grate plate then has a storage means, for example in Form a foot on which it can be used on a suitable Abutment is slidably supported. The abutment can, for example, a grate plate adjacent in the feed direction his.
  • the coolant connection in the middle between is arranged on both sides of the grate plate, it can if necessary, closer to the storage means or closer to that Connection means may be arranged. In both cases becomes a more or less even heat gradient reached on both sides. It is therefore not essential required that the coolant connection be in the middle is arranged between the two ends of the grate plate. It is crucial that it is provided in one place, on an imaginary, in the middle between the flanks, lying and connecting the ends of the grate plate together Line lies.
  • the coolant connection is preferably something towards the front end of the grate plate offset so that the distance ratio to the ends is one in two. By such a central feed or The outflow of the coolant is thermal symmetry Maintained with sufficient accuracy and somewhat increased cooling in the front area.
  • a second coolant connection can be made to any one be arranged elsewhere on the grate plate. It can that from the central connector to the one spaced therefrom second coolant connection leading coolant channel designed as a single channel or on several subchannels be divided.
  • the coolant channel routing can vary his.
  • the channel can be formed by a cavity be that of several coolant connections on the periphery of the plate for removing coolant. coolant is through the central coolant connection fed. It is also possible to use the coolant channel spiral (round) or square spiral. If necessary, the coolant channel can also be star-shaped be trained. Subchannels then extend radially away from the central coolant connection. This can be on the edge of the grate plate individually or in groups be led to further coolant connections.
  • the heat flow on the surface the grate plate by a suitable design of the Cross sections of the coolant channel can be achieved.
  • it can occur with a radial arrangement of the subchannels be expedient to the subchannels in the central area narrow the flow rate of the coolant increase here. This creates a large central area the grate plate kept relatively cool, causing thermal expansion minimized.
  • the coolant channel is spiral-shaped there is a similar heat distribution. On a large part of the total length of the coolant channel is omitted on the edge area of the grate plate, whereas one correspondingly large area of the coolant channel splits several inner turns, the total one occupy a large area.
  • the grate plate according to the invention can in addition to the coolant duct connected to the central connection be provided with a further coolant channel, the example and preferably near the as a foot trained storage means is arranged.
  • This one more Coolant channel can serve, especially occurring here reduce large thermal loads. This is especially advantageous if in this area Air gaps designed to supply combustion air are. Coming from the incoming combustion air high thermal loads here. By the inflowing Fresh air and the associated combustion there is a corrosive attack on the metal of the hot Rust plate that is tempered by cooling.
  • the grate plate can consist of one or more parts be trained.
  • the execution of the grate plate as one-piece cast body allows a particularly inexpensive Production. It turned out to be special expediently exposed the coolant channel through Einund Pouring around corresponding pipes during manufacture the grate plate in the casting process. In order to can be relatively complex cooling channel geometries inexpensive can be produced without mold cores.
  • a feed grate 1 is in the cutout illustrated, the one in a combustion chamber 2 only schematically illustrated waste incinerator is arranged.
  • the feed grate 1 is by many individual grate plates 3 are formed, of which several each transversely to a furnace longitudinal direction 4 arranged side by side are. These grate plates 3 form a grate plate group 4, the feed grate 3 by several such grate plate groups 5 arranged one behind the other, 6, 7 and others not shown in FIG. 1 Grate plate groups is formed.
  • the grate plates 3, the grate plate group 5 are on their, based on the furnace longitudinal direction 4, upstream End 8 with a transverse recess open at the bottom 9 provided, for example, from FIG. 5 and on 3 mouth-like contact surfaces on both sides of the grate plate having.
  • the mouths of the transverse recess 9 is the Grate plate 3 formed on a round rod 11, for example Grate plate support element that extends over the extends over the entire width of the feed grate 1.
  • On hers opposite end 12 is the grate plate 3 with a Riot foot 14 provided a storage means for the Grate plate 3 forms. With the foot 14 is the Grate plate 3, as shown in Figure 1, on the next one Grate plate 3a of grate plate group 6.
  • Die Grate plate 3a thus forms an abutment for the grate plate 3.
  • the grate plate 3a which like all grate plates with the grate plate 3 described as representative corresponds, is with its transverse recess 9 on a rod 15 stored, which is parallel to the rod 11 across the entire width of the feed grate 1 extends.
  • Additional rods 16 are along the entire length of the Feed grate 1 distributed, arranged transversely. Every second The rod is fixed in place. Arranged in between Rods are connected to a drive device, that of the rod in question is a reciprocating one oscillating movement in the direction of the longitudinal direction of the furnace 4 To give. This movement is in Figure 1 for the grate plate group 3 illustrated by arrows 17, 18. This results in an overall stair-shaped moving grate 1, the grate plate groups 5, 6, 7 in the manner of a staircase are arranged one above the other, each second grate plate group (6) swings back and forth to the combustion material a feed movement in the longitudinal direction of the furnace 4 to issue.
  • Fig. 8 illustrates the feed grate 1 in top view.
  • the structure of a single grate plate 3 results in particular from Figures 2 to 5.
  • the grate plate 3 is as Cast body formed.
  • the cast body defines one Grate body 21, the top 22 of which essentially flat rectangular contact surface for the burned Has good.
  • At its rear end 8 and at its The front end 12 of the grate body 21 is somewhat rounded.
  • Between the rounded area at the end 12 and the Uprising foot 14 is a transverse groove 24 is formed in the Louvers 25 for access to combustion air lead.
  • These louvers 25 are in particular from FIG 5 can be seen.
  • the air slots 25 connect the combustion chamber 2 with the trained under the feed grate 1 Area that is exposed to preheated combustion air is.
  • the air slots 25 form the only one Connection between the area below the grate and the combustion chamber 2. Close adjacent grate plates 3 essentially close together.
  • each grate plate 3 with a coolant channel 31 provided.
  • This coolant channel 31 is used the cooling of the top of the grate plate 3 and is in the thermal contact with this.
  • the coolant channel 31 is, as can be seen in particular from FIG. 4, with a provided first central coolant port 32, the on the bottom of the grate body 21 is formed.
  • To the Coolant port 32 is one that is not further illustrated Line connected, the coolant or leads away.
  • the management is flexible or with appropriate Provide joints if the grate plate 3 is a moving plate.
  • the coolant connection 32 is, as from FIG. 4 emerges in the middle between the two flanks 33, 34 of the Grate body 21 arranged.
  • the coolant port 32 is doing so on an imaginary line 33 in one position arranged closer to the end 12 than to the end 8 lies.
  • the Coolant channel 31 in several turns to a second, coolant connection 36 located at flank 33.
  • the coolant channel 31 surrounds the coolant connection 32 with the same sense of direction. He is thus independent of the actual length-width ratio of the grate body 21 as a spiral, in particular designed as a rectangular spiral. Their turns lie on a common level and are therefore equally wide removed from the top 22.
  • the turns can also in arranged at different distances from the top 22 his. For example. it is possible to use the inlet Coolant connection 32 or 36 or on these subsequent turns a little further from the top 22 to be installed away. Then the turns are not in a common plane, for example on the coat of a flat cone.
  • the individual sections 31 'of the coolant channel 31 corrugated be trained to improve the heat transfer. Both individual sections can be used 31 'and the entire coolant channel 31 are corrugated.
  • the coolant channel 31 can be through a mold core formed in the casting of the grate body 21 in this become.
  • a particularly inexpensive and safe manufacture results, however, when the coolant channel 31 is initially designed as a pipeline in the Form of the grate body 21 to be cast and subsequently from the liquid material of the grate body 21 is cast around.
  • the grate body 21 is preferred formed as a cast steel part.
  • For the pipeline can conventional piping material (steel or other Metals) can be used. It results in an intimate and good heat-conductive connection between the pipeline and the grate body 21 with good heat transfer.
  • a further coolant channel 41 is arranged transversely, which has two separate coolant connections 42, 43.
  • the Coolant channel 41 is used exclusively for the focus Cooling the end region of the grate body 21 and can be used separately and specifically with cooling water be supplied.
  • the cooling water is initially through the coolant channel 41 passed. If the grate plate 3 work at a lower temperature, the Flows through channel 31 with incoming cooling water.
  • the Cooling water supply is preferably the coolant connection 32. There are many possibilities the interconnection of the coolant channels 31, 41 each grate plate 3 and between the grate plates 3.
  • the individual grate plates 3 of the feed grate 1 can be connected separately to coolant supply sources as illustrated in Fig. 9, for example.
  • a flow line 44 is via corresponding connecting lines to the connections serving as inputs 32, 42 of the coolant channels 31, 41 connected.
  • Of the Connections 36, 43 is heated cooling water rust plate by plate discharged to a return line 45. This will achieved a very effective cooling of the grate plates 3. This concept of cooling can be very Find hot areas of the moving grate 1 application.
  • the grate plates can also be made according to different concepts the same coolant flows through one after the other will be connected in series. This is for example in Figure 11 illustrates. This solution is particularly suitable for rust areas with less thermal stress.
  • the coolant channels 31, 41 can also to be connected in series in rows. Illustrate this 10a and 10b.
  • the coolant supply can first of all from the supply line at the connection 32 take place (Fig. 10a) when the top 22 is focused to be cooled. Should the forehead area are mainly cooled, the coolant is supplied to terminal 42 (Fig. 10b). If necessary, the coolant supply can also be connected to the connection 36 respectively. This is not further illustrated in the figures, but corresponds to Fig. 10b with interchanged Flow and return line.
  • FIG. 12 shows a circuit variant of the coolant channels 31, 41 illustrates the coolant channels 31, 41 for each grate plate 3 in each Series are connected. There are also several each Grate plates connected in series. The order of Flow through the grate plates 3 is based on the Grid center set to the sides. First of all the more heavily loaded middle grate plates and afterwards flowed through the marginal grate plates 3.
  • the cooling variants are a good adaptation to different ones Opportunities in different applications or possible in different rust areas. All cooling variants illustrated in FIGS. 9 to 12 can also be exchanged for flow pipe 44 and return line 45 are used if it is the thermal load accordingly required.
  • Solid to be burned is in operation, e.g. Rubbish on the feed grate 1. Every second grate plate group 6 performs a back and forth movement (arrows 17, 18). Combustion air flows through the air slots 25 into the combustion chamber 2.
  • the coolant channels 31, 41 are flowed through by cooling water. It is with the Cooling water channel 41 a cross-flow based on the Oven longitudinal direction 4 available.
  • the coolant channel 31 realizes a circulating flow, whereby the Cooling water starting from the coolant connection 32 via transported several turns radially outwards until it arrives at the coolant connection 36 and is dissipated. While the flow rate in Circumferential direction is relatively high, is the radial component the flow movement less.
  • FIG. 6 and 7 are alternative embodiments the grate plate 3 illustrates.
  • the coolant channel 31 starts out from the central coolant connection 32 into subchannels 31a, 31b ... 31n divided. These extend starting from the coolant connection 32 initially star-shaped away from this.
  • the subchannels 31a to 31g pivot then to a transverse collecting duct 51, the arranged at the end 12 of the grate plate 3 and with a Coolant connection 36a is provided.
  • the sub-channels 31h to 31n lead in the arch to a collecting channel 52 which leads to a coolant connection 36b.
  • the grate plate 3 coincides with FIG. 6 the grate plate 3 described above, so that their description applies accordingly.
  • a central coolant supply or discharge points likewise the grate plate 3 illustrated in FIG. 4 on.
  • the coolant channel 31 branches out into a plurality of rays striving away from the coolant connection 32
  • Subchannels 31a to 31n are on their marginal side End with an encircling collecting channel 53 connected to one or more coolant connections 36 having.
  • the subchannels 31a to 31n can be in one single level or on the mantle of a flat cone be arranged. They can also cross sections along vary in length.
  • the coolant channel 31 has a coolant connection 32 which arranged in a central region of the grate plate 3 is. It is essential that the coolant connection 32 approximately midway between the two flanks 33, 34 of the grate plate 3 is arranged, at one end 8, 12 of the Grate plate 3 can be arranged offset.

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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)
  • Freezing, Cooling And Drying Of Foods (AREA)
  • Furnace Details (AREA)
  • Processing Of Solid Wastes (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
  • Seasonings (AREA)

Abstract

A grate body (21) has a locating surface (22) for the material to be burnt and which is thermally connected with a coolant channel (31), which has at least one first coolant connection (32). This first coolant connection is arranged centrally between the grate body flanks. The grate body is provided with a connecting device for a grate plate carrier. The grate plate is a cast part. The coolant channel is a pipe conduit cast into the grate body, or can be a hollow space. The grate body is of one-piece or multiple structure.

Description

Die Erfindung betrifft eine Rostplatte mit den Merkmalen des oberbegriffs des Patentanspruchs 1.The invention relates to a grate plate with the Features of the preamble of claim 1.

Zum Verbrennen von Feststoffen sind insbesondere in Müllverbrennungsanlagen Öfen mit sogenannten Vorschubrosten in Gebrauch, die das zu verbrennende Gut aufnehmen und die ihm eine Vorschubbewegung erteilen. Die Vorschubroste werden durch Roststäbe oder -platten gebildet, von denen einige ortsfest gelagert sind und andere gruppenweise hin- und hergehend in einer Vorschubrichtung bzw gegen diese bewegt werden.For the combustion of solids are particularly in Waste incineration plants ovens with so-called feed grates in use, which absorb the material to be burned and give it a feed motion. The feed grates are formed by grate bars or plates, of some of which are stationary and others in groups back and forth in a feed direction or be moved against this.

Der gesamte Rost wird dabei in der Regel durch viele neben- und hintereinander angeordnete Roststäbe oder Platten gebildet. Durch in den Roststäben oder Platten vorgesehene schlitzrtige Düsen strömt Verbrennungsluft zu dem auf dem Rost liegenden Verbrennungsgut.The entire rust is usually covered by many side by side and one behind the other grate bars or Plates formed. Through in the grate bars or plates provided slotted nozzles flows in combustion air the combustion material lying on the grate.

Die Rostplatten oder Stäbe erwärmen sich während des Betriebs durch die auf den Rostplatten liegenden abbrennenden Feststoffe beträchtlich. Die durch die Schlitze strömende Verbrennungsluft kann, zumal sie meist vorgewärmt wird bzw. aus verbrennungstechnischen Gründen einer Mengenbegrenzung unterliegt, nur einen geringen Kühleffekt bewirken. Die Temperatur ungekühlter Rostplatten oder Stäbe ist deshalb relativ hoch, was zu einer starken chemischen Korrosion und einem mechanischen Verschleiß der Rostplatten führen kann. Dies ist verständlicherweise unerwünscht.The grate plates or rods heat up during the Operating through the burning on the grate plates Solids considerably. The through the slots flowing combustion air can, especially since it is mostly preheated is or for combustion reasons is subject to a quantity limitation, only a small one Effect cooling effect. The temperature of uncooled grate plates or rods is therefore relatively high, resulting in a severe chemical corrosion and mechanical Wear of the grate plates. This is understandable undesirable.

Eine starke Erwärmung der Rostplatten hat zur Folge, dass sich diese während des Betriebs ausdehnen. Um dies zu ermöglichen, muss ein gewisses Spiel vorgesehen werden. Dieses kann wiederum dazu führen, dass zwischen den Rostplatten Spalte entstehen, durch die Luft in den Verbrennungsraum einströmt. Dies erfolgt unkontrolliert und ist deshalb abzulehnen. Weiterhin wird der Verbrennungsvorgang durch Luftüberschuß negativ beeinflußt. Außerdem können Partikel als sogenannter Rostdurchfall unter den Rost fallen, was ebenfalls unerwünscht ist.A strong warming of the grate plates results in that they expand during operation. To do this To enable a certain game must be provided. This in turn can lead to the fact that between the Rust plates arise through the air in the Combustion chamber flows in. This happens uncontrolled and is therefore to be rejected. The combustion process continues negatively influenced by excess air. In addition, particles can cause so-called rust diarrhea fall under the grate, which is also undesirable.

Aus beiden Gründen ist es erforderlich, Rostplatten während des Betriebs zu kühlen bzw. in einem konstanten Temperaturbereich zu halten. Dazu ist bspw. aus der DE 196 13 507 C1 eine Rostplatte bekannt, die sich über die gesamte Breite der Rostbahn erstreckt. Die Rostplatte weist viele sich parallel in Längsrichtung erstreckende Kühlkanäle auf, die an ihren Enden zu Sammelkanälen führen.For both reasons it is necessary to have grate plates to cool during operation or in a constant Keep temperature range. For example, from DE 196 13 507 C1 known a grate plate, which covers the stretches the entire width of the grate. The grate plate has many extending in parallel in the longitudinal direction Cooling channels on the ends to collect channels to lead.

Bei dieser Rostplatte kann eine wirksame Kühlung bewirkt werden, ohne das zwischen einzelnen Rostplatten Dehnfugen vorgesehen werden müßten, durch die unerwünschte Luft strömt. Allerdings reicht die Rostplatte über die gesamte Breite des Rostes, wodurch sie relativ groß wird.Effective cooling can be achieved with this grate plate can be effected without the between individual grate plates Expansion joints would have to be provided due to the undesirable Air flows. However, the grate plate extends over the entire width of the grate, which makes it relatively large.

Aus der EP 0621449 B1 ist eine Rostplatte mit meanderförmigen Kühlkanal bekannt. Dieser führt quer zu der Rostplatte und somit quer zu der Vorschubrichtung durch die Rostplatte. Einzelne Abschnitte des meanderförmigen Kühlmittelkanals sind dabei jeweils in Längsrichtung orientiert.EP 0621449 B1 is a grate plate with a meandering shape Cooling channel known. This leads across to the Grate plate and thus across to the feed direction the grate plate. Individual sections of the meandering Coolant channels are each in the longitudinal direction oriented.

Aus der EP 0 757 206 A2 ist ein Rost für eine Feuerungsanlage mit mindestens einer Rostbahn mit mehreren in Längsrichtung abwechselnden, beidseitig von Seitenwänden begrenzten Feststabreihen und Bewegtstabreihen aus flüssigkeitsgekühlten Rostplatten bekannt geworden. Die Rostplatten sind mit einer Vielzahl von in Gruppen angeordneten Öffnungen oder Schlitzen zur Primärluftzufuhr versehen. Zur Flüssigkühlung sind die Rostplatten mit Kühlkanälen ausgebildet, wobei diese an der Unterseite der Rostplatte vorgesehen sind und zwischen den Öffnungen oder Schlitzen liegen und wobei diese Kühlkanäle einerseits durch die Rostplatte selbst und andererseits durch an die Rostplatte angebrachte Hohlprofile gebildet sind. Die Flüssigkeitszufuhr- bzw. -abfuhrsfutzen sind jeweils seitlich entweder an der Schmalseite der Rostplatte oder etwas eingerückt bzw. am Vorder- und am Hinterende der Rostplatte angeordnet so dass das Kühlmedium die Rostplatte von einer Seite zur anderen durchströmt.EP 0 757 206 A2 describes a grate for a furnace with at least one a grate track with several alternating in the longitudinal direction, on both sides of Sidewalls delimited rows of fixed bars and rows of moving bars become known liquid-cooled grate plates. The grate plates are with one Large number of openings or slots arranged in groups for Provide primary air supply. The grate plates with cooling channels are for liquid cooling formed, which are provided on the underside of the grate plate and lie between the openings or slots and these cooling channels on the one hand through the grate plate itself and on the other hand through to the grate plate attached hollow profiles are formed. The liquid supply or discharge nozzles are either on the side of the narrow side of the grate plate or something indented or arranged at the front and rear end of the grate plate so that the cooling medium flows through the grate plate from one side to the other.

Infolge der Zuleitung des Kühlwassers an einer Seite der Rostplatte und der Ausleitung des erwärmten Kühlwassers an der anderen Seite der Rostplatte, ergibt sich ein Wärmegefälle an der Rostplatte. Das Wärmegefälle kann zu unterschiedlichen Ausdehnungen an beiden Seiten der Rostplatte führen. Solche Differenzdehnungen können zum Verziehen der Rostplatte führen. Dadurch können sich Spalten bilden, die deutlich größer sind, als die Wärmedehnung selbst. Um diese möglichst gering zu halten ist ein relativ großer Kühlmitteldurchsatz erforderlich. Außerdem kann nur mit geringen Kühlmittelerwärmungen gearbeitet werden, um den Verzug und/oder Verwerfungen der Rostplatte infolge unterschiedlicher Wärmedehnungen zu vermeiden. Ansonsten könnten sich zwischen benachbarten Rostplatten Spalte bilden, durch die unkontrolliert Luft in den Verbrennungsraum zuströmt und Rostdurchfall auftritt.Due to the supply of cooling water on one side the grate plate and the discharge of the heated cooling water on the other side of the grate plate results a heat gradient on the grate plate. The heat gradient can to different extents on both sides of the Guide the grate plate. Such differential strains can Warp the grate plate. This allows you to Form gaps that are significantly larger than the thermal expansion itself. To keep this as low as possible a relatively large coolant throughput is required. In addition, only with slight coolant warming be worked to the default and / or faults the grate plate due to different thermal expansions to avoid. Otherwise, could be between neighboring Rust plates form column through which unchecked Air flows into the combustion chamber and rust diarrhea occurs.

Davon ausgehend ist es Aufgabe der Erfindung, eine Rostplatte zu schaffen, die eine geringe Verwerfungsneigung hat. Based on this, it is an object of the invention to To create grate plate that has a low tendency to warp Has.

Diese Aufgabe wird mit einer Rostplatte nach Anspruch 1 mit einem sich an der thermischen Belastung der Rostplatte orientierenden Kühlsystem gelöst.This task is with a grate plate according to claim 1 with one on the thermal load of the Grid plate orientated cooling system solved.

Bei der erfindungsgemäßen Rostplatte ist ein Kühlmittelkanal vorgesehen, der einen zentralen Kühlmittelanschluss aufweist, während die Anschlüsse beim Stand der Technik meist seitlich angeordnet sind. Durch die zentrale Anordnung des Kühlmittelanschlusses wird das Kühlmittel der Rostplatte und dem Kühlmittelkanal zentral zu bzw. abgeführt. Von hier ausgehend führt der Kühlmittelkanal zu periphären Rostplattenbereichen, wo das Kühlmittel ab bzw. zugeführt wird.In the grate plate according to the invention there is a coolant channel provided a central coolant connection has, while the connections at the state of Technology are usually arranged on the side. Through the central Arrangement of the coolant connection becomes the coolant the grate plate and the coolant channel centrally or dissipated. The coolant channel leads from here to peripheral grate plate areas where the coolant from or is supplied.

Durch die Aufheizung des Kühlmittels entlang des Kühlmittelkanals entsteht ein Wärmegefälle entlang des Kühlmittelkanals. Wird die Rostplatte in Betrieb von oben her aufgeheizt, ergibt sich somit ein Wärmegefälle von dem zentralen Anschluss zu den periphären Randbereichen der Rostplatte, oder umgekehrt. In jedem Fall ist die Wärmeverteilung mehr oder weniger symmetrisch. Je nach Kühlmittelflussrichtung kann die Rostplatte im Mittelbereich oder am Rand stärker gekühlt werden. Jedenfalls aber ist die Temperaturverteilung bezüglich einer Längsmittelebene im Wesentlichen symmetrisch. Damit wird das Dehnungsverhalten und damit auch die Wärmespannungsverteilung der Rostplatte durch Schwerpunktkühlung wesentlich verbessert. Es können Verwerfungen und somit die Ausbildung von freien Querschnitten zwischen benachbarten Roststäben oder -platten oder ein Verklemmen von bewegten Rostplatten vermieden werden. Dadurch kann Rostdurchfall, d.h. das Durchfallen von Feststoffen zwischen einzelnen Rostplatten oder Stäben vermindert werden. Außerdem können die erforderlichen Kühlwassermengen reduziert und die Temperaturdifferenzen insgesamt erhöht werden, was eine höhere Aufheizung des Kühlwassers und somit eine nochmalige Verminderung der erforderlichen Menge bedingt. By heating the coolant along the Coolant channel creates a heat gradient along the Coolant channel. The grate plate is in operation from above heated up, there is a heat gradient of the central connection to the peripheral peripheral areas the grate plate, or vice versa. In any case, it is Heat distribution more or less symmetrical. Depending on The grate plate can flow in the center of the coolant flow or be cooled more at the edge. In any case but is the temperature distribution with respect to a longitudinal median plane essentially symmetrical. So that will be Expansion behavior and thus also the thermal stress distribution the grate plate by cooling the center of gravity improved. There can be faults and thus the Formation of free cross sections between neighboring ones Rust bars or plates or jamming of moving Rust plates can be avoided. This can cause rust diarrhea, i.e. falling solids between individuals Rust plates or bars can be reduced. Moreover can reduce the amount of cooling water required and the temperature differences are increased overall what a higher heating of the cooling water and thus a repeated reduction of the required amount conditionally.

Durch zentrale Kühlmittelzu- oder abführung kann es gelingen, größere Bereiche der Rostplatte kühl zu halten, wodurch, auch wenn die Randbereiche aufgeheizt werden, insgesamt eine relativ geringe Wärmeausdehnung erreicht wird. Außerdem können Differenzdehnungen eliminiert, die Wärmeausdehnungen der Rostplatte bei minimierter Kühlmediummenge vergleichmäßigt und Wärmespannungen im Gußwerkstoff reduziert werden.With central coolant supply or discharge, it can succeed in keeping large areas of the grate plate cool, whereby, even if the edge areas are heated, overall achieved a relatively low thermal expansion becomes. Differential strains can also be eliminated Thermal expansion of the grate plate with a minimized amount of cooling medium equalized and thermal stresses in the cast material be reduced.

Die Rostplatte ist insbesondere für Vorschubroste vorgesehen. Dazu ist sie an einem Ende mit einem Verbindungsmittel versehen, mit dem sie mit einem Rostplattenträger verbindbar ist. Dieser ist bspw. ein Rundstab oder ein sonstiger Träger. An ihrem gegenüberliegenden Ende weist die Rostplatte dann ein Lagermittel, bspw. in Form eines Fusses auf, mit dem sie auf einem geeigneten Widerlager verschiebbar abstützbar ist. Das Widerlager kann bspw. eine in Vorschubrichtung benachbarte Rostplatte sein.The grate plate is especially for feed grates intended. To do this, it has a lanyard at one end provided with which they with a grate plate carrier is connectable. This is, for example, a round bar or any other carrier. On their opposite At the end, the grate plate then has a storage means, for example in Form a foot on which it can be used on a suitable Abutment is slidably supported. The abutment can, for example, a grate plate adjacent in the feed direction his.

Soweit der Kühlmittelanschluss mittig zwischen beiden Flanken der Rostplatte angeordnet ist, kann er bedarfsweise näher an dem Lagermittel oder näher zu dem Verbindungsmittel hin angeordnet sein. In beiden Fällen wird ein mehr oder weniger gleichmäßiges Wärmegefälle zu beiden Flanken hin erreicht. Es ist deshalb nicht unbedingt erforderlich, dass der Kühlmittelanschluss mittig zwischen den beiden Enden der Rostplatte angeordnet ist. Entscheidend ist, dass er an einer Stelle vorgesehen ist, die auf einer gedachten, mittig zwischen den Flanken, liegenden und die Enden der Rostplatte miteinander verbindenden Linie liegt. Vorzugsweise ist der Kühlmittelanschluß etwas zu dem vorderen Ende der Rostplatte hin versetzt, so dass das Abstandsverhältnis zu den Enden eins zu zwei beträgt. Durch die derart mittige Zu- oder Abströmung des Kühlmittels ist die thermische Symmetrie hinreichend genau gewahrt und eine etwas erhöhte Kühlung im vorderen Bereich ermöglicht. As far as the coolant connection in the middle between is arranged on both sides of the grate plate, it can if necessary, closer to the storage means or closer to that Connection means may be arranged. In both cases becomes a more or less even heat gradient reached on both sides. It is therefore not essential required that the coolant connection be in the middle is arranged between the two ends of the grate plate. It is crucial that it is provided in one place, on an imaginary, in the middle between the flanks, lying and connecting the ends of the grate plate together Line lies. The coolant connection is preferably something towards the front end of the grate plate offset so that the distance ratio to the ends is one in two. By such a central feed or The outflow of the coolant is thermal symmetry Maintained with sufficient accuracy and somewhat increased cooling in the front area.

Ein zweiter Kühlmittelanschluss kann an beliebiger anderer Stelle der Rostplatte angeordnet sein. Dabei kann der von dem zentralen Anschluss zu dem davon beabstandeten zweiten Kühlmittelanschluss führende Kühlmittelkanal als Einzelkanal ausgebildet oder auf mehrere Teilkanäle aufgeteilt sein.A second coolant connection can be made to any one be arranged elsewhere on the grate plate. It can that from the central connector to the one spaced therefrom second coolant connection leading coolant channel designed as a single channel or on several subchannels be divided.

Die Kühlmittelkanalführung kann unterschiedlich sein. Bspw. kann der Kanal durch einen Hohlraum gebildet sein, der an der Peripherie der Platte mehrere Kühlmittelanschlüsse zum Abführen von Kühlmittel aufweist. Kühlmittel wird durch den zentralen Kühlmittelanschluss zugeführt. Außerdem ist es möglich, den Kühlmittelkanal spiralförmig (rund) oder als eckige Spirale auszuführen. Bedarfsweise kann der Kühlmittelkanal auch sternförmig ausgebildet sein. Es erstrecken sich dann Teilkanäle radial von dem mittigen Kühlmittelanschluss weg. Diese können an dem Rand der Rostplatte einzeln oder in Gruppen zu weiteren Kühlmittelanschlüssen geführt sein.The coolant channel routing can vary his. For example. the channel can be formed by a cavity be that of several coolant connections on the periphery of the plate for removing coolant. coolant is through the central coolant connection fed. It is also possible to use the coolant channel spiral (round) or square spiral. If necessary, the coolant channel can also be star-shaped be trained. Subchannels then extend radially away from the central coolant connection. This can be on the edge of the grate plate individually or in groups be led to further coolant connections.

In allen Fällen kann der Wärmeverlauf auf der Oberfläche der Rostplatte durch eine geeignete Gestaltung der Querschnitte des Kühlmittelkanals erreicht werden. Bspw. kann es bei strahlenförmiger Anordnung der Teilkanäle zweckmäßig sein, die Teilkanäle im Zentralbereich zu verengen, um die Fließgeschwindigkeit des Kühlmittels hier zu erhöhen. Dadurch wird ein großer Zentralbereich der Rostplatte relativ kühl gehalten, was Wärmedehnungen minimiert. Bei spiralförmiger Ausbildung des Kühlmittelkanals ergibt sich eine ähnliche Wärmeverteilung. Ein großer Teil der Gesamtlänge des Kühlmittelkanals entfällt auf den Randbereich der Rostplatte, wohingegen sich ein entsprechend großer Bereich des Kühlmittelkanals auf mehrere innere Windungen aufteilt, die insgesamt eine große Fläche einnehmen.In all cases, the heat flow on the surface the grate plate by a suitable design of the Cross sections of the coolant channel can be achieved. For example. it can occur with a radial arrangement of the subchannels be expedient to the subchannels in the central area narrow the flow rate of the coolant increase here. This creates a large central area the grate plate kept relatively cool, causing thermal expansion minimized. If the coolant channel is spiral-shaped there is a similar heat distribution. On a large part of the total length of the coolant channel is omitted on the edge area of the grate plate, whereas one correspondingly large area of the coolant channel splits several inner turns, the total one occupy a large area.

Die erfindungsgemäße Rostplatte kann zusätzlich zu dem mit dem zentralen Anschluss verbundenen Kühlmittelkanal mit einem weiteren Kühlmittelkanal versehen sein, der beispiels- und vorzugsweise in der Nähe des als Fuss ausgebildeten Lagermittels angeordnet ist. Dieser weitere Kühlmittelkanal kann dazu dienen, hier auftretende besonders große thermische Belastungen zu reduzieren. Dies ist insbesondere dann vorteilhaft, wenn in diesem Bereich Luftspalte zur Zuführung von Verbrennungsluft ausgebildet sind. Durch die zuströmende Verbrennungsluft entstehen gerade hier hohe thermisch Belastungen. Durch die zuströmende Frischluft und die damit verbundene Verbrennung erfolgt ein korrosiver Angriff auf das Metall der heißen Rostplatte, der durch Kühlung gemildert wird.The grate plate according to the invention can in addition to the coolant duct connected to the central connection be provided with a further coolant channel, the example and preferably near the as a foot trained storage means is arranged. This one more Coolant channel can serve, especially occurring here reduce large thermal loads. This is especially advantageous if in this area Air gaps designed to supply combustion air are. Coming from the incoming combustion air high thermal loads here. By the inflowing Fresh air and the associated combustion there is a corrosive attack on the metal of the hot Rust plate that is tempered by cooling.

Die Rostplatte kann sowohl ein- als auch mehrteilig ausgebildet sein. Die Ausführung der Rostplatte als einteiligter Gußkörper gestattet eine besonders kostengünstige Herstellung. Dabei hat es sich als besonders zweckmäßig herausgestellt, den Kühlmittelkanal durch Einund Umgiessen von entsprechenden Rohrleitungen beim Herstellen der Rostplatte im Gußverfahren auszubilden. Damit können relativ komplizierte Kühlkanalgeometrien kostengünstig ohne Formkerne hergestellt werden.The grate plate can consist of one or more parts be trained. The execution of the grate plate as one-piece cast body allows a particularly inexpensive Production. It turned out to be special expediently exposed the coolant channel through Einund Pouring around corresponding pipes during manufacture the grate plate in the casting process. In order to can be relatively complex cooling channel geometries inexpensive can be produced without mold cores.

Vorteilhafte Einzelheiten von Ausführungsformen der Erfindung sind Gegenstand von Unteransprüchen und ergeben sich aus der Zeichnung sowie der zugehörigen Beschreibung. In der Zeichnung sind Ausführungsbeispiele der Erfindung veranschaulicht. Es zeigen:

  • Fig. 1 einen aus mehreren Rostplatten zusammengesetzten Vorschubrost, der in dem Innenraum eines Ofens angeordnet ist, in vereinfachter schematisierter und perspektivischer Darstellung,
  • Fig. 2 eine Rostplatte des Vorschubrosts nach Figur 1, in perspektivischer, schematisierter Darstellung,
  • Fig. 3 die Rostplatte nach Figur 2, mit besonderer Veranschaulichung von in der Rostplatte ausgebildeten Kühlmittelkanälen, in perspektivischer Darstellung,
  • Fig. 4 die Rostplatte nach den Figuren 2 und 3, in einer schematisierten Draufsicht,
  • Fig. 5 die Rostplatte nach Figur 4, geschnitten entlang der Linie V-V,
  • Fig. 6 eine abgewandelte Ausführungsform der erfindungsgemäßen Rostplatte, in schematisierter perspektivischer Darstellung, und
  • Fig. 7 eine weitere abgewandelte Ausführungsform der erfindungsgemäßen Rostplatte, in schematisierter und perspektivischer Darstellung,
  • Fig. 8 den Vorschubrost nach Fig. 1 mit schematischer Veranschaulichung der Kühlmittelkanälle der Rostplatten, in einer schematisierten Draufsicht,
  • Fig. 9 eine aus dem Vorschubrost nach Fig. 1 und 8 herausgegriffene Rostplattengruppe mit Einzelversorgung aller Kühlmittelkanäle, in schematisierter Darstellung,
  • Fig. 10a eine aus dem Vorschubrost nach Fig. 1 und 8 herausgegriffene Rostplattengruppe mit rostplattenweise hintereinandergeschalteten Kühlmittelkanälen und Kühlmittelzufuhr an der Rostplattenmitte, in schematisierter Darstellung,
  • Fig. 10b eine aus dem Vorschubrost nach Fig. 1 und 8 herausgegriffene Rostplattengruppe mit rostplattenweise hintereinandergeschalteten Kühlmittelkanälen und Kühlmittelzufuhr zu einem stirnseitigen Kühlmittelkanal, in schematisierter Darstellung,
  • Fig. 11 eine aus dem Vorschubrost nach Fig. 1 und 8 herausgegriffene Rostplattengruppe mit gruppenweise hintereinandergeschalteten Front- und Rücken-Kühlmittelkanälen, in schematisierter Darstellung, und
  • Fig. 12 eine aus dem Vorschubrost nach Fig. 1 und 8 herausgegriffene Rostplattengruppe mit plattenweise hintereinandergeschalteten Kühlmittelkanälen und Hintereinanderschaltung der Kühlmittelkanäle ausgewählter Rostplatten, in schematisierter Darstellung.
    • Advantageous details of embodiments of the invention are the subject of dependent claims and result from the drawing and the associated description. Exemplary embodiments of the invention are illustrated in the drawing. Show it:
  • 1 shows a feed grate composed of a plurality of grate plates, which is arranged in the interior of a furnace, in a simplified schematic and perspective illustration,
  • 2 shows a grate plate of the feed grate according to FIG. 1, in a perspective, schematic representation,
  • 3 shows the grate plate according to FIG. 2, with a special illustration of coolant channels formed in the grate plate, in a perspective view,
  • 4 the grate plate according to FIGS. 2 and 3, in a schematic plan view,
  • 5 shows the grate plate according to FIG. 4, cut along the line VV,
  • Fig. 6 shows a modified embodiment of the grate plate according to the invention, in a schematic perspective view, and
  • 7 shows a further modified embodiment of the grate plate according to the invention, in a schematic and perspective representation,
  • 8 shows the feed grate according to FIG. 1 with a schematic illustration of the coolant channels of the grate plates, in a schematic plan view,
  • 9 shows a grate plate group picked out from the feed grate according to FIGS. 1 and 8 with individual supply of all coolant channels, in a schematic representation,
  • 10a is a schematic representation of a grate plate group picked out from the feed grate according to FIGS. 1 and 8, with coolant channels and coolant supply at the middle of the grate plate connected one after the other in the form of grate plates,
  • 10b shows a grate plate group picked out from the feed grate according to FIGS. 1 and 8, with coolant channels connected one after the other in the manner of a plate and coolant supply to an end-side coolant channel, in a schematic illustration,
  • 11 shows a grate plate group picked out from the feed grate according to FIGS. 1 and 8 with group-connected front and back coolant channels, in a schematic representation, and
  • 12 is a schematic representation of a grate plate group picked out from the feed grate according to FIGS. 1 and 8 with coolant channels connected in series plate-wise and connecting the coolant channels in series.

    • Beschreibung :Description :

    In Figur 1 ist ein Vorschubrost 1 im Ausschnitt veranschaulicht, der in einer Brennkammer 2 eines lediglich schematisch veranschaulichten Müllverbrennungsofens angeordnet ist. Der Vorschubrost 1 wird durch viele einzelne Rostplatten 3 gebildet, von denen jeweils mehrere quer zu einer Ofenlängsrichtung 4 nebeneinander angeordnet sind. Diese Rostplatten 3 bilden eine Rostplattengruppe 4, wobei der Vorschubrost 3 durch mehrere solcher hintereinander angeordneten Rostplattengruppen 5, 6, 7 sowie weitere in Figur 1 nicht veranschaulichte Rostplattengruppen gebildet ist.In Figure 1, a feed grate 1 is in the cutout illustrated, the one in a combustion chamber 2 only schematically illustrated waste incinerator is arranged. The feed grate 1 is by many individual grate plates 3 are formed, of which several each transversely to a furnace longitudinal direction 4 arranged side by side are. These grate plates 3 form a grate plate group 4, the feed grate 3 by several such grate plate groups 5 arranged one behind the other, 6, 7 and others not shown in FIG. 1 Grate plate groups is formed.

    Die Rostplatten 3, der Rostplattengruppe 5 sind an ihrem, bezogen auf die Ofenlängsrichtung 4, stromaufwärtigen Ende 8 mit einer nach unten offenen Querausnehmung 9 versehen, die bspw. aus Figur 5 hervorgeht und an beiden seiten der Rostplatte 3 maulartige Auflageflächen aufweist. Mit den Mäulern der Querausnehmung 9 liegt die Rostplatte 3 auf einem bspw. als runde Stange 11 ausgebildeten Rostplattenträgerelement, das sich über die gesamte Breite des Vorschubrosts 1 erstreckt. An ihrem gegenüberliegenden Ende 12 ist die Rostplatte 3 mit einem Aufstandsfuss 14 versehen, der ein Lagermittel für die Rostplatte 3 bildet. Mit dem Aufstandsfuss 14 liegt die Rostplatte 3, wie aus Figur 1 hervorgeht, auf der nächstfolgenden Rostplatte 3a der Rostplattengruppe 6. Die Rostplatte 3a bildet somit ein Widerlager für die Rostplatte 3. Die Rostplatte 3a, die wie alle Rostplatten mit der stellvertretend beschriebenen Rostplatte 3 übereinstimmt, ist mit ihrer Querausnehmung 9 auf einer Stange 15 gelagert, die sich parallel zu der Stange 11 quer über die gesamte Breite des Vorschubrosts 1 erstreckt.The grate plates 3, the grate plate group 5 are on their, based on the furnace longitudinal direction 4, upstream End 8 with a transverse recess open at the bottom 9 provided, for example, from FIG. 5 and on 3 mouth-like contact surfaces on both sides of the grate plate having. With the mouths of the transverse recess 9 is the Grate plate 3 formed on a round rod 11, for example Grate plate support element that extends over the extends over the entire width of the feed grate 1. On hers opposite end 12 is the grate plate 3 with a Riot foot 14 provided a storage means for the Grate plate 3 forms. With the foot 14 is the Grate plate 3, as shown in Figure 1, on the next one Grate plate 3a of grate plate group 6. Die Grate plate 3a thus forms an abutment for the grate plate 3. The grate plate 3a, which like all grate plates with the grate plate 3 described as representative corresponds, is with its transverse recess 9 on a rod 15 stored, which is parallel to the rod 11 across the entire width of the feed grate 1 extends.

    Weitere Stangen 16 sind über die gesamte Länge des Vorschubrosts 1 verteilt, quer angeordnet. Jede zweite Stange ist dabei orstfest montiert. Dazwischen angeordnete Stangen sind mit einer Antriebsvorrichtung verbunden, die der betreffenden Stange eine hin und hergehende ozillierende Bewegung in Richtung der Ofenlängsrichtung 4 erteilen. Diese Bewegung ist in Figur 1 für die Rostplattengruppe 3 durch Pfeile 17, 18 veranschaulicht. Somit ergibt sich ein insgesamt treppenförmiger Vorschubrost 1, dessen Rostplattengruppen 5, 6, 7 nach Art einer-Treppe übereinanderliegend angeordnet sind, wobei jede zweite Rostplattengruppe (6) vor und zurück schwingt, um dem Verbrennungsgut eine Vorschubbewegung in Ofenlängsrichtung 4 zu erteilen. Fig. 8 veranschaulicht den Vorschubrost 1 in Draufsicht.Additional rods 16 are along the entire length of the Feed grate 1 distributed, arranged transversely. Every second The rod is fixed in place. Arranged in between Rods are connected to a drive device, that of the rod in question is a reciprocating one oscillating movement in the direction of the longitudinal direction of the furnace 4 To give. This movement is in Figure 1 for the grate plate group 3 illustrated by arrows 17, 18. This results in an overall stair-shaped moving grate 1, the grate plate groups 5, 6, 7 in the manner of a staircase are arranged one above the other, each second grate plate group (6) swings back and forth to the combustion material a feed movement in the longitudinal direction of the furnace 4 to issue. Fig. 8 illustrates the feed grate 1 in top view.

    Der Aufbau einer einzelnen Rostplatte 3 ergibt sich insbesondere aus Figur 2 bis 5. Die Rostplatte 3 ist als Gußkörper ausgebildet. Der Gußkörper definiert einen Rostkörper 21, dessen Oberseite 22 eine im Wesentlichen flache rechteckige Auflagefläche für das zu verbrennende Gut aufweist. An seinem hinteren Ende 8 und an seinem vorderen Ende 12 ist der Rostkörper 21 etwas abgerundet. Zwischen dem abgerundeten Bereich an dem Ende 12 und dem Aufstandsfuss 14 ist eine Quernut 24 ausgebildet, in der Luftschlitze 25 für den Zutritt von Verbrennungsluft münden. Diese Luftschlitze 25 sind insbesondere aus Figur 5 ersichtlich. Die Luftschlitze 25 verbinden die Brennkammer 2 mit dem unter dem Vorschubrost 1 ausgebildeten Bereich, der mit vorgewärmter Verbrennungsluft beaufschlagt ist. Die Luftschlitze 25 bilden dabei die einzige Verbindung zwischen dem Bereich unterhalb des Rostes und der Brennkammer 2. Benachbarte Rostplatten 3 schliessen im Wesentlichen dicht aneinander an.The structure of a single grate plate 3 results in particular from Figures 2 to 5. The grate plate 3 is as Cast body formed. The cast body defines one Grate body 21, the top 22 of which essentially flat rectangular contact surface for the burned Has good. At its rear end 8 and at its The front end 12 of the grate body 21 is somewhat rounded. Between the rounded area at the end 12 and the Uprising foot 14 is a transverse groove 24 is formed in the Louvers 25 for access to combustion air lead. These louvers 25 are in particular from FIG 5 can be seen. The air slots 25 connect the combustion chamber 2 with the trained under the feed grate 1 Area that is exposed to preheated combustion air is. The air slots 25 form the only one Connection between the area below the grate and the combustion chamber 2. Close adjacent grate plates 3 essentially close together.

    Die Rostplatten 3 unterliegen im Betrieb einer starken thermischen Beanspruchung. Um zu verhindern, dass die Rostplatten 3 während des Betriebs durch das auf den Rostplatten lagernde abbrennende Verbrennungsgut zu stark erhitzt werden, ist jede Rostplatte 3 mit einem Kühlmittelkanal 31 versehen. Dieser Kühlmittelkanal 31 dient der Kühlung der Oberseite der Rostplatte 3 und steht im thermischen Kontakt mit dieser. Der Kühlmittelkanal 31 ist wie insbesondere aus Figur 4 hervorgeht, mit einem ersten mittigen Kühlmittelanschluss 32 versehen, der an der Unterseite des Rostkörpers 21 ausgebildet ist. An den Kühlmittelanschluss 32 ist eine nicht weiter veranschaulichte Leitung angeschlossen, die Kühlmittel heran- oder wegführt. Die Leitung ist flexibel oder mit entsprechenden Gelenken versehen, falls es sich bei der Rostplatte 3 um eine bewegte Platte handelt.The grate plates 3 are subject to operation strong thermal stress. To prevent that the grate plates 3 during operation by the on Burning combustible material stored in rust plates too strong are heated, each grate plate 3 with a coolant channel 31 provided. This coolant channel 31 is used the cooling of the top of the grate plate 3 and is in the thermal contact with this. The coolant channel 31 is, as can be seen in particular from FIG. 4, with a provided first central coolant port 32, the on the bottom of the grate body 21 is formed. To the Coolant port 32 is one that is not further illustrated Line connected, the coolant or leads away. The management is flexible or with appropriate Provide joints if the grate plate 3 is a moving plate.

    Der Kühlmittelanschluss 32 ist, wie aus Figur 4 hervorgeht, mittig zwischen beiden Flanken 33, 34 des Rostkörpers 21 angeordnet. Der Kühlmittelanschluss 32 ist dabei auf einer gedachten Linie 33 in einer Position angeordnet, die näher bei dem Ende 12 als bei dem Ende 8 liegt.The coolant connection 32 is, as from FIG. 4 emerges in the middle between the two flanks 33, 34 of the Grate body 21 arranged. The coolant port 32 is doing so on an imaginary line 33 in one position arranged closer to the end 12 than to the end 8 lies.

    Ausgehend von dem Kühlmittelanschluss 32 führt der Kühlmittelkanal 31 in mehreren Windungen zu einem zweiten, bei der Flanke 33 liegenden Kühlmittelanschluss 36. Der Kühlmittelkanal 31 umrundet dabei den Kühlmittelanschluss 32 mit gleichbleibendem Richtungssinn. Er ist somit unabhängig von den tatsächlichen Längen-Breitenverhältniss des Rostkörpers 21 als Spirale, insbesondere als Rechteckspirale ausgebildet. Deren Windungen liegen in einer gemeinsamen Ebene und sind somit jeweils gleichweit von der Oberseite 22 entfernt.Starting from the coolant connection 32, the Coolant channel 31 in several turns to a second, coolant connection 36 located at flank 33. The coolant channel 31 surrounds the coolant connection 32 with the same sense of direction. He is thus independent of the actual length-width ratio of the grate body 21 as a spiral, in particular designed as a rectangular spiral. Their turns lie on a common level and are therefore equally wide removed from the top 22.

    Zur Vergleichmäßigung der Temperatur des Rostkörpers 21 an seiner Oberseite 22, können die Windungen auch in unterschiedlichen Abständen zu der Oberseite 22 angeordnet sein. Bspw. ist es möglich, den als Zulauf genutzten Kühlmittelanschluss 32 oder 36 bzw. die sich an diesen anschliessenden Windungen etwas weiter von der Oberseite 22 entfernt zu verlegen. Die Windungen liegen dann nicht in einer gemeinsamen Ebene sondern bspw. auf dem Mantel eines flachen Kegels. To even out the temperature of the grate body 21 on its top 22, the turns can also in arranged at different distances from the top 22 his. For example. it is possible to use the inlet Coolant connection 32 or 36 or on these subsequent turns a little further from the top 22 to be installed away. Then the turns are not in a common plane, for example on the coat of a flat cone.

    Wie insbesondere Fig. 4 veranschaulicht, können die einzelnen Abschnitte 31' des Kühlmittelkanals 31 gewellt ausgebildet sein, um den Wärmeübergang noch zu verbessern. Dabei können sowohl lediglich einzelne Abschnitt 31' als auch der gesamte Kühlmittelkanal 31 gewellt sien.As particularly illustrated in FIG. 4, the individual sections 31 'of the coolant channel 31 corrugated be trained to improve the heat transfer. Both individual sections can be used 31 'and the entire coolant channel 31 are corrugated.

    Der Kühlmittelkanal 31 kann durch einen Formkern beim Giessen des Rostkörpers 21 in diesem ausgebildet werden. Eine besonders kostengünstige und sichere Herstellung ergibt sich jedoch, wenn der Kühlmittelkanal 31 zunächst als Rohrleitung ausgebildet wird, die in der Form des zu giessenden Rostkörpers 21 angeordnet und nachfolgend von dem flüssigen Material des Rostkörpers 21 umgossen wird. Der Rostkörper 21 wird dabei vorzugsweise als Stahlgußteil ausgebildet. Für die Rohrleitung kann herkömmliches Rohrleitungsmaterial (Stahl oder andere Metalle) verwendet werden. Es ergibt sich eine innige und gut wärmeleitfähige Verbindung zwischen der Rohrleitung und dem Rostkörper 21 mit gutem Wärmeübergang.The coolant channel 31 can be through a mold core formed in the casting of the grate body 21 in this become. A particularly inexpensive and safe manufacture results, however, when the coolant channel 31 is initially designed as a pipeline in the Form of the grate body 21 to be cast and subsequently from the liquid material of the grate body 21 is cast around. The grate body 21 is preferred formed as a cast steel part. For the pipeline can conventional piping material (steel or other Metals) can be used. It results in an intimate and good heat-conductive connection between the pipeline and the grate body 21 with good heat transfer.

    An dem Ende 12 des Rostkörpers 21 treten relativ hohe Temperaturen auf. Dies ist insbesondere im Bereich der Quernut 24 der Fall. Um eine Überhitzung zu vermeiden, ist ein weiterer Kühlmittelkanal 41 quer angeordnet, der zwei eigene Kühlmittelanschlüsse 42, 43 aufweist. Der Kühlmittelkanal 41 dient ausschliesslich der schwerpunktmäßigen Kühlung des Endbereichs des Rostkörpers 21 und kann entsprechend separat und gezielt mit Kühlwasser versorgt werden.At the end 12 of the grate body 21 occur relatively high temperatures. This is particularly true in the area the transverse groove 24 is the case. To avoid overheating, a further coolant channel 41 is arranged transversely, which has two separate coolant connections 42, 43. The Coolant channel 41 is used exclusively for the focus Cooling the end region of the grate body 21 and can be used separately and specifically with cooling water be supplied.

    Soll die Rostplatte 3 insgesamt auf höherer Temperatur betrieben werden, wird das Kühlwasser zunächst durch den Kühlmittelkanal 41 geleitet. Soll die Rostplatte 3 auf niedrigerer Temperatur arbeiten, wird zunächst der Kanal 31 mit zufliessendem Kühlwasser durchströmt. Die Kühlwasserzuführung ist dabei vorzugsweise der Kühlmittelanschluss 32. Dabei ergeben sich viele Möglichkeiten der Zusammenschaltung der Kühlmittelkanäle 31, 41 an jeder Rostplatte 3 und zwischen den Rostplatten 3.If the grate plate 3 as a whole at a higher temperature are operated, the cooling water is initially through the coolant channel 41 passed. If the grate plate 3 work at a lower temperature, the Flows through channel 31 with incoming cooling water. The Cooling water supply is preferably the coolant connection 32. There are many possibilities the interconnection of the coolant channels 31, 41 each grate plate 3 and between the grate plates 3.

    Die einzelnen Rostplatten 3 des Vorschubrosts 1 können separat an Kühlmittelversorgungsquellen angeschlossen sein, wie in bspw. Fig. 9 veranschaulicht ist. Eine Vorlaufleitung 44 ist über entsprechende Verbindungsleitungen an die als Eingänge dienenden Anschlüsse 32, 42 der Kühlmittelkanäle 31, 41 angeschlossen. Von den Anschlüssen 36, 43 wird erwärmtes Kühlwasser rostplattenweise zu einer Rücklaufleitung 45 abgeführt. Dadurch wird eine sehr wirksame Kühlung der Rostplatten 3 erreicht. Dieses Konzept der Kühlung kann insbesondere in sehr heißen Bereichen des Vorschubrosts 1 Anwedung finden.The individual grate plates 3 of the feed grate 1 can be connected separately to coolant supply sources as illustrated in Fig. 9, for example. A flow line 44 is via corresponding connecting lines to the connections serving as inputs 32, 42 of the coolant channels 31, 41 connected. Of the Connections 36, 43 is heated cooling water rust plate by plate discharged to a return line 45. This will achieved a very effective cooling of the grate plates 3. This concept of cooling can be very Find hot areas of the moving grate 1 application.

    Werden ungleiche Plattentemperaturen toleriert, können die Rostplatten nach verschiedenen Konzepten auch nacheinander von dem gleichen Kühlmittel durchflossen werden, d.h in Reihe geschaltet sein. Dies ist bspw. in Fig. 11 veranschaulicht. Diese Lösung eignet sich insbesondere für thermisch weniger belastete Rostbereiche.If unequal plate temperatures are tolerated, the grate plates can also be made according to different concepts the same coolant flows through one after the other will be connected in series. This is for example in Figure 11 illustrates. This solution is particularly suitable for rust areas with less thermal stress.

    Entsprechend können die Kühlmittelkanäle 31, 41 auch rostplattenweise in Reihe geschaltet sein. Dies veranschaulichen die Fig. 10a und 10b. Die Kühlmittelzufuhr kann von der Vorlaufleitung her zunächst an dem Anschluß 32 erfolgen (Fig. 10a), wenn die Oberseite 22 schwerpunktmäßig gekühlt werden soll. Soll der Stirnbereich schwerpunktmäßig gekühlt werden, erfolgt die Kühlmittelzuführung zu dem Anschluß 42 (Fig. 10b). Bedarfsweise kann die Kühlmittelzuführung auch an dem Anschluß 36 erfolgen. Dies ist in den Figuren nicht weiter veranschaulicht, entspricht aber Fig. 10b mit vertauschter Vorlauf- und Rücklaufleitung.Correspondingly, the coolant channels 31, 41 can also to be connected in series in rows. Illustrate this 10a and 10b. The coolant supply can first of all from the supply line at the connection 32 take place (Fig. 10a) when the top 22 is focused to be cooled. Should the forehead area are mainly cooled, the coolant is supplied to terminal 42 (Fig. 10b). If necessary, the coolant supply can also be connected to the connection 36 respectively. This is not further illustrated in the figures, but corresponds to Fig. 10b with interchanged Flow and return line.

    In Fig. 12 ist eine Verschaltungsvariante der Kühlmittelkanäle 31, 41 veranschaulicht, bei der die Kühlmittelkanäle 31, 41 für jede Rostplatte 3 jeweils in Reihe geschaltet sind. Außerdem sind jeweils mehrere Rostplatten in Reihe geschaltet. Die Reihenfolge der Durchströmung der Rostplatten 3 ist ausgehend von der Rostmitte nach den Seiten hin festgelegt. Zunächst werden die stärker belasteten mittleren Rostplatten und danach die randständigen Rostplatten 3 durchflossen.12 shows a circuit variant of the coolant channels 31, 41 illustrates the coolant channels 31, 41 for each grate plate 3 in each Series are connected. There are also several each Grate plates connected in series. The order of Flow through the grate plates 3 is based on the Grid center set to the sides. First of all the more heavily loaded middle grate plates and afterwards flowed through the marginal grate plates 3.

    Durch die entsprechende Wahl und/oder Kombination der Kühlungsvarianten ist eine gute Anpassung an unterschiedliche Gegenheiten bei unterschiedlichen Einsatzfällen oder in unterschiedlichen Rostbereichen möglich. Alle in den Figuren 9 bis 12 veranschaulichten Kühlvarianten können auch unter Vertauschung von Vorlaufleitung 44 und Rücklaufleitung 45 eingesetzt werden, wenn es die thermische Belastung entsprechend erfordert.Through the appropriate choice and / or combination The cooling variants are a good adaptation to different ones Opportunities in different applications or possible in different rust areas. All cooling variants illustrated in FIGS. 9 to 12 can also be exchanged for flow pipe 44 and return line 45 are used if it is the thermal load accordingly required.

    Der insoweit beschriebene Vorschubrost 1 arbeitet wie folgt:The feed grate 1 described so far works as follows:

    In Betrieb liegt zu verbrennender Feststoff, bspw. Müll auf dem Vorschubrost 1 auf. Jede zweite Rostplattengruppe 6 führt eine hin- und hergehende Bewegung (Pfeile 17, 18) aus. Durch die Luftschlitze 25 strömt Verbrennungluft in die Brennkammer 2. Die Kühlmittelkanäle 31, 41 sind von Kühlwasser durchströmt. Dabei ist bei dem Kühlwasserkanal 41 eine Querdurchströmung bezogen auf die Ofenlängsrichtung 4 vorhanden. Der Kühlmittelkanal 31 realisiert eine umlaufende Durchströmung, wobei das Kühlwasser ausgehend von dem Kühlmittelanschluss 32 über mehrere Windungen hinweg radial nach außen transportiert wird, bis es an dem Kühlmittelanschluss 36 ankommt und abgeführt wird. Während die Fließgeschwindigkeit in Umfangsrichtung relativ hoch ist, ist die Radialkomponente der Fliessbewegung geringer. Durch die relativ große Umfangsgeschwindigkeit auf der etwa spiralförmigen von dem Kühlmittelkanal 31 festgelegten Bahn ergibt sich eine gute Vergleichmäßigung der Temperatur. Unabhängig von der Radialrichtung werden in gleichen Entfernungen zu dem Kühlmittelanschluss 32 nahezu gleiche Temperaturen erreicht. Damit sind die Temperaturen an beiden Flanken 33, 34 gleich groß. Es ergibt sich kein Wärmegefälle von der einen Seite des Rostkörpers 21 zur anderen.Solid to be burned is in operation, e.g. Rubbish on the feed grate 1. Every second grate plate group 6 performs a back and forth movement (arrows 17, 18). Combustion air flows through the air slots 25 into the combustion chamber 2. The coolant channels 31, 41 are flowed through by cooling water. It is with the Cooling water channel 41 a cross-flow based on the Oven longitudinal direction 4 available. The coolant channel 31 realizes a circulating flow, whereby the Cooling water starting from the coolant connection 32 via transported several turns radially outwards until it arrives at the coolant connection 36 and is dissipated. While the flow rate in Circumferential direction is relatively high, is the radial component the flow movement less. Due to the relatively large Peripheral speed on the approximately spiral of the path defined in the coolant channel 31 results in a path good temperature uniformity. Independent of Radial directions are at equal distances from that Coolant connection 32 reached almost the same temperature. The temperatures on both flanks 33 are thus 34 the same size. There is no heat gradient from the one side of the grate body 21 to the other.

    In den Figuren 6 und 7 sind alternative Ausführungsformen der Rostplatte 3 veranschaulicht. Bei der Rostplatte 3 nach Figur 6 ist der Kühlmittelkanal 31 ausgehend von dem zentralen Kühlmittelanschluss 32 in Teilkanäle 31a, 31b... 31n aufgeteilt. Diese erstrecken sich ausgehend von dem Kühlmittelanschluss 32 zunächst sternförmig von diesem weg. Die Teilkanäle 31a bis 31g schwenken dann zu einem quer angeordneten Sammelkanal 51, der bei dem Ende 12 der Rostplatte 3 angeordnet und mit einem Kühlmittelanschluss 36a versehen ist. Die Teilkanäle 31h bis 31n führen im Bogen zu einem Sammelkanal 52, der zu einem Kühlmittelanschluss 36b führt.6 and 7 are alternative embodiments the grate plate 3 illustrates. With the grate plate 3 according to FIG. 6, the coolant channel 31 starts out from the central coolant connection 32 into subchannels 31a, 31b ... 31n divided. These extend starting from the coolant connection 32 initially star-shaped away from this. The subchannels 31a to 31g pivot then to a transverse collecting duct 51, the arranged at the end 12 of the grate plate 3 and with a Coolant connection 36a is provided. The sub-channels 31h to 31n lead in the arch to a collecting channel 52 which leads to a coolant connection 36b.

    Im Übrigen stimmt die Rostplatte 3 nach Figur 6 mit der vorstehend beschriebenen Rostplatte 3 überein, so dass deren Beschreibung entsprechend gilt.In addition, the grate plate 3 coincides with FIG. 6 the grate plate 3 described above, so that their description applies accordingly.

    Eine zentrale Kühlmittelzu- oder abführung weist ebenfalls die in Figur 4 veranschaulichte Rostplatte 3 auf. Von dem ersten Kühlmittelanschluss 32 ausgehend, verzweigt sich der Kühlmittelkanal 31 auf mehrere strahlenförmig von dem Kühlmittelanschluss 32 wegstrebende Teilkanäle 31a bis 31n. Diese sind an ihrem randseitigen Ende mit einem umlaufenden angeordneten Sammelkanal 53 verbunden, der ein oder mehrere Kühlmittelanschlüsse 36 aufweist. Die Teilkanäle 31a bis 31n können in einer einzigen Ebene oder auf dem Mantel eines flachen Kegels angeordnet sein. Außerdem können ihre Querschnitte entlang ihrer jeweiligen Länge variieren.A central coolant supply or discharge points likewise the grate plate 3 illustrated in FIG. 4 on. Starting from the first coolant connection 32, The coolant channel 31 branches out into a plurality of rays striving away from the coolant connection 32 Subchannels 31a to 31n. These are on their marginal side End with an encircling collecting channel 53 connected to one or more coolant connections 36 having. The subchannels 31a to 31n can be in one single level or on the mantle of a flat cone be arranged. They can also cross sections along vary in length.

    Eine wasserkühlbare Rostplatte 3, die insbesondere für Müllverbrennungsöfen zum Einsatz kommt, weist wenigstens einen Kühlmittelkanal 31 auf. Dieser dient der Kühlung der Oberseite 22 der Rostplatte 3. Der Kühlmittelkanal 31 weist einen Kühlmittelanschluss 32 auf, der in einem mittleren Bereich der Rostplatte 3 angeordnet ist. Dabei ist wesentlich, dass der Kühlmittelanschluss 32 etwa mittig zwischen beiden Flanken 33, 34 der Rostplatte 3 angeordnet ist, wobei er zu einem Ende 8, 12 der Rostplatte 3 hin versetzt angeordnet sein kann.A water-cooled grate plate 3, which in particular used for incinerators, at least points a coolant channel 31. This serves the Cooling the top 22 of the grate plate 3. The coolant channel 31 has a coolant connection 32 which arranged in a central region of the grate plate 3 is. It is essential that the coolant connection 32 approximately midway between the two flanks 33, 34 of the grate plate 3 is arranged, at one end 8, 12 of the Grate plate 3 can be arranged offset.

    Claims (26)

    1. Grate panel (3) with cooling system, in particular for pusher type grates (1), wherein several grate panels are arranged next to each other and one behind the other, preferably partly overlapping each other,
         with a grate body (21), which seen in longitudinal direction of the furnace (4) is laterally limited by edges (33, 34) and which is provided with a contact surface (22) at its upper side for the solids to be burnt, the contact surface being thermally connected with a coolant duct (31), being provided with at least a first coolant connection (32) ) with a pipe for the supply or discharge of the coolant, the first coolant connection (32) being arranged at the centre between the edges (33, 34) of the grate body (21).
    2. Grate panel according to claim 1, characterised in that the grate body (21) is provided with a joining element (9) for a grate panel support (11).
    3. Grate panel according to claim 2, characterised in that the joining element (9) is a recess, with which the grate body (21) is provided at its lower side and which is equipped to take up the grate panel support (11), the recess being preferably arranged at one end (8) of the grate panel (3) and extending between the edges (33, 34) of the grate body (21).
    4. Grate panel according to claim 3, characterised in that it is provided with a bearing element (14) at its end (12) being set off from the joining element (9), by which the grate panel (3) can be supported on a buttress stay.
    5. Grate panel according to claim 4, characterised in that the first coolant duct (31) connection (32) arranged at the centre between the edges (33, 34) is located at an unequal distance from the ends (8, 12).
    6. Grate panel according to claim 1, characterised in that the coolant duct (31) originating from the first coolant connection (32) arranged at the centre between the edges (33, 34) is led to a second coolant connection (36) located at a distance from the first coolant connection (32).
    7. Grate panel according to claim 6, characterised in that the second coolant connection (36) is arranged in the vicinity of an edge (33, 34).
    8. Grate panel according to claim 6, characterised in that the second coolant connection (36) is arranged at one end (8) of the grate body (21).
    9. Grate panel according to claim 1, characterised in that the coolant duct (31) in the grate body (21) is mainly arranged on one single level.
    10. Grate panel according to claim 1, characterised in that the coolant duct (31) originating from its first connection (32) is arranged in at least one circumferential winding.
    11. Grate panel according to claim 10, characterised in that the coolant duct (31) is provided with several windings with a constant sense of rotation.
    12. Grate panel according to claim 10, characterised in that the winding is provided with at least one straight or undulated section.
    13. Grate panel according to claim 12, characterised in that the winding is mainly provided with a rectangular design.
    14. Grate panel according to claim 1, characterised in that the coolant duct (31) is provided with at least two sub-ducts (31a, 31b) connected with each other at the starting point and at the end.
    15. Grate panel according to claim 14, characterised in that the sub-ducts (31a, 31b) originating from the first coolant connection (32) are arranged radially.
    16. Grate panel according to claim 1, characterised in that the coolant duct (31) is provided with a constant cross-section over its length.
    17. Grate panel according to claim 6, characterised in that the coolant duct (31) is provided with a cross-section, changing between the coolant connections.
    18. Grate panel according to claim 1, characterised in that the cross-section near the first or second coolant connection (32, 36) to be utilised for the coolant supply is larger than at the other coolant connection (36, 32).
    19. Grate panel according to claim 1, characterised in that it is provided with a further coolant duct (41).
    20. Grate panel according to claim 4, characterised in that the further coolant duct (41) is arranged in the vicinity of the bearing element (14) and extends preferably between the edges (33, 34).
    21. Grate panel according to claim 20, characterised in that the further coolant duct (41) and the coolant duct (31) are connected with each other in series or parallel connection, the coolant ducts (31, 41) of adjacent grate panels being preferably connected with each other.
    22. Grate panel according to claim 1, characterised in that it is designed as a cast part.
    23. Grate panel according to claim 22, characterised in that the coolant duct (31) is designed as a pipeline cast in the grate body (21).
    24. Grate panel according to claim 1, characterised in that the coolant duct (31) is formed by a hollow space cast in the grate panel (21).
    25. Grate panel according to claim 1, characterised in that the grate body (21) is designed as one piece.
    26. Grate panel according to claim 1, characterised in that the grate body (21) is designed with several parts.
    EP98122738A 1997-12-05 1998-11-30 Liquid cooled grate plate Expired - Lifetime EP0921354B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    DE19753981 1997-12-05
    DE19753981A DE19753981C2 (en) 1997-12-05 1997-12-05 Liquid-cooled grate plate

    Publications (2)

    Publication Number Publication Date
    EP0921354A1 EP0921354A1 (en) 1999-06-09
    EP0921354B1 true EP0921354B1 (en) 2003-04-09

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    Application Number Title Priority Date Filing Date
    EP98122738A Expired - Lifetime EP0921354B1 (en) 1997-12-05 1998-11-30 Liquid cooled grate plate

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    US (1) US6269756B1 (en)
    EP (1) EP0921354B1 (en)
    CN (1) CN1230658A (en)
    AT (1) ATE237102T1 (en)
    CZ (1) CZ294174B6 (en)
    DE (2) DE19753981C2 (en)
    DK (1) DK0921354T3 (en)
    HU (1) HU220436B (en)
    PL (1) PL191099B1 (en)

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    DE59807844D1 (en) 2003-05-15
    CN1230658A (en) 1999-10-06
    HUP9802802A3 (en) 2000-04-28
    HUP9802802A2 (en) 1999-11-29
    ATE237102T1 (en) 2003-04-15
    HU220436B (en) 2002-01-28
    CZ294174B6 (en) 2004-10-13
    DE19753981A1 (en) 1999-06-17
    PL191099B1 (en) 2006-03-31
    CZ397298A3 (en) 1999-07-14
    HU9802802D0 (en) 1999-02-01
    US6269756B1 (en) 2001-08-07
    EP0921354A1 (en) 1999-06-09
    DE19753981C2 (en) 2000-04-06
    DK0921354T3 (en) 2003-08-04
    PL330133A1 (en) 1999-06-07

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