EP3384221B1 - Grate plate for a grate cooler - Google Patents

Grate plate for a grate cooler Download PDF

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Publication number
EP3384221B1
EP3384221B1 EP16801210.2A EP16801210A EP3384221B1 EP 3384221 B1 EP3384221 B1 EP 3384221B1 EP 16801210 A EP16801210 A EP 16801210A EP 3384221 B1 EP3384221 B1 EP 3384221B1
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EP
European Patent Office
Prior art keywords
grate plate
grate
pocket
covering region
cooling air
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.)
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Application number
EP16801210.2A
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German (de)
French (fr)
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EP3384221A1 (en
Inventor
Waldemar KOROTEZKY
Klaus Zenker
Ravi SAKSENA
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.)
KHD Humboldt Wedag AG
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KHD Humboldt Wedag AG
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Publication of EP3384221A1 publication Critical patent/EP3384221A1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D15/00—Handling or treating discharged material; Supports or receiving chambers therefor
    • F27D15/02—Cooling
    • F27D15/0206—Cooling with means to convey the charge
    • F27D15/0213—Cooling with means to convey the charge comprising a cooling grate
    • F27D15/022—Cooling with means to convey the charge comprising a cooling grate grate plates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D15/00—Handling or treating discharged material; Supports or receiving chambers therefor
    • F27D15/02—Cooling
    • F27D15/0206—Cooling with means to convey the charge
    • F27D15/0213—Cooling with means to convey the charge comprising a cooling grate
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D15/00—Handling or treating discharged material; Supports or receiving chambers therefor
    • F27D15/02—Cooling
    • F27D15/0206—Cooling with means to convey the charge
    • F27D15/0213—Cooling with means to convey the charge comprising a cooling grate
    • F27D15/022—Cooling with means to convey the charge comprising a cooling grate grate plates
    • F27D2015/0233—Cooling with means to convey the charge comprising a cooling grate grate plates with gas, e.g. air, supply to the grate

Definitions

  • the invention relates to a grate plate for use in a grate cooler for hot bulk material, comprising a first work area ('overlap area') which is alternately covered by at least one further grate plate when the grate plate is used in a grate cooler, the overlap area being at least one pocket for holding bulk material has an autogenous wear protection layer, and a second work area (when the grate plate is used in a grate cooler that is not covered by a further grate plate ('cover-free area')), the cover-free area for holding bulk material as an autogenous wear protection layer at least one pocket with at least one to the underside of the grate plate has leading opening for the introduction of cooling air.
  • a first work area ('overlap area') which is alternately covered by at least one further grate plate when the grate plate is used in a grate cooler, the overlap area being at least one pocket for holding bulk material has an autogenous wear protection layer
  • a second work area when the grate
  • Grate coolers are used to cool hot bulk goods, such as burned mineral goods or cement clinker that comes out of a rotary kiln.
  • the hot bulk material is transported over the cooling section of the grate cooler and is typically cooled by heat exchange with cooling air introduced in a crossflow process.
  • a transport method that is also suitable under extreme temperature and abrasive wear conditions is based on the popular moving grate cooler system.
  • the grate cooler consists of grate plate supports arranged in steps one behind the other. Fixed, static grate plate carriers alternate with movable grate plate carriers in the transport direction, which move in the transport direction towards and away from the transport direction when they are supported on movable, driven push frames.
  • grate plates are arranged in rows in the grate plate carriers.
  • the working area of the grate plates is the area of their top surface on which the hot bulk material rests or over which the bulk material is moved during the conveying process.
  • the back and forth movement of the movable grate plate carrier results in a partial overlap or overlap of two grate plates (rows) that follow one another in stages.
  • each grate plate (except on the first, top step) is divided into two work areas, namely a first work area, which is alternately covered by at least one grate plate of the step above due to the oscillating conveying movement of the movable steps during operation of the grate cooler , in short: overlap area, and in a second work area that is not covered by any grate plate from the step above, i.e. an overlap-free area.
  • the grate plates are particularly exposed to two strong, but also interacting wear effects.
  • the high, often in excess of 1000 ° C temperature of the hot bulk material softens the grate plate material, mostly steel.
  • the top of the grate plate is attacked by abrasive wear due to the relative movement to the hot bulk material, which is often present in granules.
  • grate plates therefore often have trough-like or pocket-like depressions.
  • rust plates are proposed, the working area of which has such pockets both in the overlap area and in the overlap-free area.
  • this retained material acts as an autogenous wear protection layer, since it is in direct contact with the material transported over the plate Prevents material with the pocket bottom.
  • this cooling layer also acts as thermal insulation, so that the grate plates, at least in the area of the pockets, have a higher surface hardness due to the lower temperature and thus also a higher resistance to wear.
  • the wear on the pocket base in the overlap region in particular temperature-induced wear and tear due to the compression of the bulk material layer, cannot be sufficiently reduced in general by cooling by means of cooling air supply through normal openings which lead to the underside of the grate plate.
  • the object of the invention is therefore to provide a grate plate for use in a grate cooler for hot bulk material which overcomes or at least mitigates the disadvantages mentioned in the prior art relating to cooling properties, economy and wear.
  • a grate plate for use in a grate cooler for hot bulk goods with the features of claim 1. Further advantageous refinements are specified in the subclaims to claim 1.
  • the height of the at least one pocket in the coverage area is smaller than the height of the at least one pocket in the coverage-free area.
  • the bottoms of which, in the untypical case, are not level and horizontal the average height must be assumed. If there are several pockets on the grate plate, the different ones Having a height, for example adapted to the bed geometry that is typical in the operation of the grate cooler, the deepest pocket of the overlap region, that is to say the one with the greatest height, is therefore smaller than the pocket with the lowest height of the uncovered region.
  • the person skilled in the art will first choose the height of the pockets in the overlap area so that on the one hand a sufficient autogenous wear protection layer is formed in them, but on the other hand the layer thickness is not too great, which would unnecessarily increase the flow resistance or pressure drop. Based on this, the height of the pockets in the overlap area according to the invention to be smaller, typically considerably smaller, but without making the pockets so flat that no wear protection layer could be held on, leads to the described compression of the held bulk layer being less pronounced.
  • the flow resistance or pressure loss in the cover area is therefore advantageously reduced compared to the use of pockets of the same height as in the cover-free area, so that the disadvantages explained at the outset - in particular with regard to an uneconomical increase in the air inflow speed, with regard to temperature-induced wear in the pockets of the cover area and with regard to cooling disadvantages in the area without overlap (unfavorable temperature gradients, cold runner risk) - are weakened.
  • the pockets are designed in such a way that the pockets have the same height in the overlapping area and the pockets have the same height in the overlapping area. It is further provided that the height of the at least one pocket in the overlap region is less than a third, preferably less than one fifth, of the height of the at least one pocket in the region without overlap.
  • the training opportunity is an autogenous one Wear protection layer. This depends on the nature of the hot bulk material, but it has been shown that holding such a layer for typical grate cooler applications, in particular for cement clinker cooling, is possible without problems even at heights of the height relationships mentioned.
  • the height of the pocket in the coverage area should typically be no less than 5% of the pocket height in the coverage-free area.
  • the pocket height to less than a third, preferably less than a fifth
  • good wear protection of the pockets in the area of overlap and effective, uniform cooling in the entire area are ensured, which can be attributed to the alternating removal of the overlap area from a hot bed layer by the oscillating lifting movement.
  • the bottom of the at least one pocket in the overlap area is formed by a plurality of segments, the upper sides of which serve as a support surface for bulk material and between which gap-like cooling air channels are formed for the supply of cooling air.
  • the openings of the cooling air ducts between the upper sides of the segments are each aligned at such an angle to the vertical that there is an acute angle between the conveying direction of the bulk material and the direction of the cooling air flow through the openings.
  • a flow of bulk material designed in this way which, apart from the deflections and swirling on and in the bulk material that then occur, is predominantly oriented in the conveying direction with vector components, supplies the surface of the grate plate on the pocket bottom, and consequently the tops of the segments, in comparison to exactly upwards directed openings additionally with cooling air and in this way additionally reduces the temperature-induced wear of the grate plate.
  • the openings of the cooling air channels between the upper sides of the segments are aligned in the overlap area so that when the grate plate is used in a grate cooler, the cooling air flow is introduced approximately in the conveying direction of the bulk material.
  • the cooling air flow is therefore directed approximately parallel to the surface of the segments, which both reduces the compression effect, although not completely prevented according to the invention (an adequate autogenous wear protection layer is retained), and also ensures better cooling of the segments, and therefore the pocket.
  • grate plates are functionally advantageously arranged in a row next to each other in a grate cooler, ie transversely to the conveying direction, and in a grate plate the pockets are in turn arranged in rows transversely and parallel to the conveying direction, that is to say in a mesh-like or grid-like manner.
  • an advantageous embodiment of the invention provides that in the at least one pocket in the overlap area the segments forming the bottom are arranged one behind the other in relation to the conveying direction.
  • the openings of the cooling air channels which are formed gap-like between adjacent segments without interruption over the entire width of the pocket, ensure a uniform opening Cooling favors. In this case, straight segment boundaries formed perpendicular to the conveying direction prove to be particularly advantageous.
  • connection element for example a hook device
  • a hook device for below the overlap area the grate plate is attached in a grate cooler.
  • a hook or a correspondingly different connecting element should preferably be arranged in the center of the underside, that is to say in the vertical center plane of the grate plate that runs parallel to the conveying direction.
  • the upper sides of the segments form the contact surfaces for the bulk material acting as a wear protection layer in the pockets of the overlap area and thus the bottom of these pockets.
  • the tops are therefore essentially flat, for example.
  • the segments must be able to withstand the loads of force due to the hot bulk material lying on top and conveyed with thrust pressure and must form the cooling air ducts according to the invention between them.
  • the segments Viewed from a long side of the plate (here assumed to be horizontally mounted), transversely to the conveying direction, the segments thus have a double-angled profile with a horizontal, flat, approximately cuboidal component at the bottom, and also an upward-extending component at its end (seen in the conveying direction) approximately cuboidal component and with a third, approximately horizontal, approximately cuboidal component in the conveying direction, which attaches to the end of the segment and forms the top of the segment, so that the profile is given the shape of a stylized, angular "S".
  • the shape is not fixed to an exactly right internal angle between the components, rather the shape can also be slightly sheared, preferably sheared in the conveying direction.
  • the edges between the components can also be rounded for manufacturing reasons; slightly curved components also meet the requirements mentioned.
  • the double-angled segments can preferably be designed with a sheared shape in the transport direction and / or with their tops (descending in the direction of transport) can be arranged in stages or also be designed with correspondingly inclined or beveled tops.
  • a further advantageous embodiment of this embodiment consists in that the segments of the at least one pocket of the covering area have at least on their top side at least one rib-like armor extending in the conveying direction and thereby obliquely to the center of the transverse extent of the covering area.
  • the cooling air which is carried out from the cooling air ducts between the double-angled segments in or approximately in the conveying direction thus becomes part of the armoring to the center of the coverage area steered on the top of the grate plate, the center of the plate top being given by its central axis running in the conveying direction. Due to the bed geometry given here in phases, there may be increased cooling requirements in the middle plate area.
  • the central region of the overlap region in typical embodiments is pocket-free in order to enable the underside of the plate to be fastened to the grate cooler.
  • the armor plates, typically given as build-up welds, are made of particularly wear-resistant material, because due to their exposed position they are exposed to high abrasive and temperature-related wear.
  • the segments of the at least one pocket of the cover area each have at least one air guide rib, which guides cooling air starting in the bottom area of the grate plate and running over the respective segment up to the top of the segment.
  • cooling air is additionally conducted in regions of the upper side of the double-angled segment which, due to the autogenous wear protection layer and the cooling air deflection that is provided, in particular upwards, otherwise experience inadequate cooling.
  • An obliquely inward arrangement of the air-guiding ribs provides the advantages given by the armouring in the above-described embodiment of increased cooling of the central region of the overlap region by partially deflecting the cooling air flow from the gap-like cooling air channels between the segments.
  • the at least one opening leading to the underside of the grate plate for the introduction of cooling air is arranged such that when the grate plate is used in a grate cooler, the opening direction is one Has an angle to the vertical.
  • the opening for the cooling air supply is, for example, a cylindrical channel
  • the longitudinal axis of this tube is not positioned vertically, but forms an acute angle to the vertical direction.
  • the projectively reduced opening mouth towards the vertical and the angled opening course mean that larger particles of the hot bulk material, e.g. B. larger cement clinker granules, fix in the cooling air supply channel and then advantageously form a barrier for trickling bulk material, whereby the rust diarrhea is reduced.
  • larger particles of the hot bulk material e.g. B. larger cement clinker granules
  • the bulk material is conveyed by thrust by means of the end face of the moving grate plates in the conveying direction in the manner of a conveying edge.
  • the grate plates therefore have a push edge on their front face.
  • this fulfills the function of a counter surface in the event of possible movements of the bulk material against the conveying direction during the alternating movement cycle of the moving grate plate rows.
  • the grate plate has an exchangeable push edge in an economically advantageous manner, since the push edge is exposed to particularly heavy wear.
  • the size of the gap to the grate plate closest to the conveying direction is set by the expansion of the pushing edge in the vertical direction perpendicular to the conveying direction.
  • FIG. 1 A grate plate 1 according to the invention is shown, the upper side of which is composed of a first work area, the overlap area 2, and a second work area, the overlap-free area 3.
  • hot bulk material (not shown) falls from the grate plate step above it onto the overlap area 2 and is pushed from there by the oscillating back and forth movement of the grate plate (s) 1 located above into the overlap-free area 3.
  • FIG Figure 4 As in Figure 5 ).
  • movably mounted rows of rust plates 1 alternate with statically fixed rows.
  • the upper grate plate 1 can be assumed to be movable and oscillating pushing movements, while the lower grate plate 1 is stationary. In this way, bulk material (not shown) that has fallen from the upper grate plate 1 into the overlap area 2 of the lower grate plate 1 is pushed through the shear edge 4 of the upper grate plate 1 into the overlap-free area 3 of the lower grate plate 1 and through at the next push cycle coming bulk goods conveyed from the lower grate plate 1 over its push edge 4. In all figures, the conveying direction (minus perspective twists) is therefore from left to right.
  • the thrust edge 4 of the upper grate plate 1 in each case thus overlaps the maximum overlap area 2 of the grate plate 1 underneath at maximum feed position, but does not reach the overlap-free area 3.
  • the grate plate 1 has pockets 5 in the overlap-free region 3, which are preferably arranged in rows and transverse to the conveying direction, as in the exemplary embodiment shown. Bulk material is retained in the grate cooler during operation, which forms an autogenous wear protection layer (not shown) for the pockets 5 in the overlap-free area 3. In contact with this layer, the bulk bed is transported over the grate plate 1. Openings 6 are arranged in the bottom of the pockets 5 in the overlap-free area 3, which lead to the underside of the grate plate 1 and are blown through the cooling air into the wear protection layer and the conveyed good bed layer located thereon.
  • the pockets 5 in the overlap-free area 3 have a height 7 which is just sufficient for the formation of the wear protection layer, as shown in FIG Figure 2b as in Figure 3b is drawn. Pockets 5 are also arranged in the overlap area 2 (see FIG. Figure 1 ), which has such a height 8 (s. Figure 3b and Figure 5 ) that they also hold an autogenous wear protection layer (not shown) during operation.
  • the bottom of the pockets 5 in the overlap region 2 is formed by the upper sides of several segments 9 each. These tops serve as contact surfaces for the wear protection layer made of retained bulk material. Between the segments 9 of a pocket 5 arranged one behind the other in the illustrated embodiment, gap-like cooling air channels 10 are formed for the supply of cooling air.
  • the height 8 of the pockets 5 in the overlap area 2 is also substantially smaller (less than a third, preferably less than a fifth) of the height 7 of the pockets 5 in the overlap-free area 3, as in particular also in Figure 3b is recognizable.
  • FIG 2b is along the section line AA Figure 2a resulting cross-sectional view through the grate plate 1 shown.
  • a hook 11 is arranged as a connecting element in the central region of the underside of the grate plate 1 under the overlap region 2. For reasons of stability, there is no pocket above the hook 11, but a material surface of sufficient thickness.
  • the double-angled segments are provided with an additional air-guiding rib 12, which guides the cooling air far to the top of the respective segment 9 and thus further improves the cooling effect and wear protection.
  • the additional air guiding ribs 12 guide the cooling air from the cooling air duct 10 between the segments 9 in the direction of the center of the overlap area 2, where the grate plate 1 in the exemplary embodiment does not have a pocket 5 and therefore also does not have cooling due to the fastening components 11 attached underneath or heat-insulating wear protection layer.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Furnace Details (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Description

Die Erfindung betrifft eine Rostplatte zum Einsatz in einem Rostkühler für heißes Schüttgut, aufweisend einen ersten, beim Einsatz der Rostplatte in einem Rostkühler alternierend von mindestens einer weiteren Rostplatte überdeckten Arbeitsbereich (,Überdeckungsbereich'), wobei der Überdeckungsbereich mindestens eine Tasche zum Halten von Schüttgut als autogene Verschleißschutzschicht aufweist, und einen zweiten, beim Einsatz der Rostplatte in einem Rostkühler nicht von einer weiteren Rostplatte überdeckten Arbeitsbereich (,überdeckungsfreier Bereich'), wobei der überdeckungsfreie Bereich zum Halten von Schüttgut als autogene Verschleißschutzschicht mindestens eine Tasche mit mindestens einer zur Unterseite der Rostplatte führenden Öffnung für die Einleitung von Kühlluft aufweist.The invention relates to a grate plate for use in a grate cooler for hot bulk material, comprising a first work area ('overlap area') which is alternately covered by at least one further grate plate when the grate plate is used in a grate cooler, the overlap area being at least one pocket for holding bulk material has an autogenous wear protection layer, and a second work area (when the grate plate is used in a grate cooler that is not covered by a further grate plate ('cover-free area')), the cover-free area for holding bulk material as an autogenous wear protection layer at least one pocket with at least one to the underside of the grate plate has leading opening for the introduction of cooling air.

Rostkühler werden eingesetzt, um heißes Schüttgut, wie z.B. gebrannte mineralische Güter oder Zementklinker, der aus einem Drehrohrofen austritt, abzukühlen. Das heiße Schüttgut wird dabei über die Kühlstrecke des Rostkühlers transportiert und typischerweise durch Wärmeaustausch mit im Querstromverfahren eingeleiteter Kühlluft gekühlt. Ein auch unter extremen Temperatur- und abrasiven Verschleißbedingungen geeignetes Transportverfahren beruht auf dem verbreiteten Schubrostkühlersystem. Der Rostkühler besteht hierbei aus stufenweise hintereinander angeordneten Rostplattenträgern. Dabei wechseln sich in Transportrichtung ortsfeste, statische Rostplattenträger mit beweglichen Rostplattenträgern ab, welche sich gelagert auf beweglichen, angetriebenen Schubrahmen in Transportrichtung hin und entgegen der Transportrichtung wieder zurück bewegen. Durch diese oszillierende Bewegung wird das Schüttgut über die Stufen geschoben und durch den Kühler befördert. Quer zur Transport-, d.h. Förderrichtung sind in den Rostplattenträgern in Reihen nebeneinander Rostplatten angeordnet. Als Arbeitsbereich der Rostplatten ist der Flächenanteil ihrer Oberseite zu bezeichnen, auf dem das heiße Schüttgut aufliegt bzw. über den während des Förderprozesses das Schüttgut bewegt wird. Alternierend kommt es durch die Hin-und-her-Bewegung der beweglichen Rostplattenträger zu einer teilweisen Überlappung bzw. Überdeckung zweier stufenweise aufeinander folgenden Rostplatten(reihen). Demnach teilt sich der Arbeitsbereich einer jeden Rostplatte (außer auf der ersten, obersten Stufe) in zwei Arbeitsbereiche, nämlich in einen ersten Arbeitsbereich, der im Betrieb des Rostkühlers aufgrund der oszillierenden Förderbewegung der beweglichen Stufen alternierend von mindestens einer Rostplatte der darüber liegenden Stufe überdeckt wird, kurz: Überdeckungsbereich, und in einen zweiten Arbeitsbereich, der von keiner Rostplatte der darüber liegenden Stufe überdeckt wird, also einen überdeckungsfreien Bereich.Grate coolers are used to cool hot bulk goods, such as burned mineral goods or cement clinker that comes out of a rotary kiln. The hot bulk material is transported over the cooling section of the grate cooler and is typically cooled by heat exchange with cooling air introduced in a crossflow process. A transport method that is also suitable under extreme temperature and abrasive wear conditions is based on the popular moving grate cooler system. The grate cooler consists of grate plate supports arranged in steps one behind the other. Fixed, static grate plate carriers alternate with movable grate plate carriers in the transport direction, which move in the transport direction towards and away from the transport direction when they are supported on movable, driven push frames. This oscillating movement pushes the bulk material over the steps and conveyed through the cooler. At right angles to the transport, ie conveying direction, grate plates are arranged in rows in the grate plate carriers. The working area of the grate plates is the area of their top surface on which the hot bulk material rests or over which the bulk material is moved during the conveying process. Alternately, the back and forth movement of the movable grate plate carrier results in a partial overlap or overlap of two grate plates (rows) that follow one another in stages. Accordingly, the work area of each grate plate (except on the first, top step) is divided into two work areas, namely a first work area, which is alternately covered by at least one grate plate of the step above due to the oscillating conveying movement of the movable steps during operation of the grate cooler , in short: overlap area, and in a second work area that is not covered by any grate plate from the step above, i.e. an overlap-free area.

Die Rostplatten sind insbesondere zwei starken, dabei auch zusammenwirkenden Verschleißwirkungen ausgesetzt. Einerseits erweicht die hohe, nicht selten über 1000°C betragende Temperatur des heißen Schüttguts das Rostplattenmaterial, zumeist Stahl. Andererseits wird die Rostplatte auf ihrer Oberseite aufgrund der Relativbewegung zum heißen, häufig in Granalien vorliegenden Schüttgut durch abrasiven Verschleiß angegriffen. Zum Schutz vor solchen thermo-mechanischen Überbeanspruchungen weisen Rostplatten daher häufig mulden- bzw. taschenartige Vertiefungen auf. In der vorangemeldeten Patentanmeldung mit dem Aktenzeichen 10 2014 008 010.2 werden Rostplatten vorgeschlagen, deren Arbeitsbereich sowohl im Überdeckungsbereich als auch im überdeckungsfreien Bereich solche Taschen aufweist. In den beispielsweise quaderförmigen Taschen einer Rostplatte wird aufgrund deren in vertikaler Ausdehnungsrichtung gegebenen Vertiefung, also ihrer Höhe, ein Teil des Schüttgutes gehalten. Dieses festgehaltene Material wirkt einerseits als autogene Verschleißschutzschicht, da es einen direkten Kontakt des über die Platte transportierten Materials mit dem Taschenboden verhindert. Andererseits wirkt diese sich abkühlende Schicht auch als Wärmeisolation, so dass die Rostplatten zumindest im Bereich der Taschen aufgrund der geringeren Temperatur eine höhere Oberflächenhärte und somit auch eine höhere Widerstandsfähigkeit gegen Verschleiß aufweisen.The grate plates are particularly exposed to two strong, but also interacting wear effects. On the one hand, the high, often in excess of 1000 ° C temperature of the hot bulk material softens the grate plate material, mostly steel. On the other hand, the top of the grate plate is attacked by abrasive wear due to the relative movement to the hot bulk material, which is often present in granules. To protect against such thermo-mechanical overloads, grate plates therefore often have trough-like or pocket-like depressions. In the previously filed patent application with the file number 10 2014 008 010.2 rust plates are proposed, the working area of which has such pockets both in the overlap area and in the overlap-free area. In the, for example, cuboid pockets of a grate plate, part of the bulk material is held due to its depression, ie its height, given in the vertical direction of expansion. On the one hand, this retained material acts as an autogenous wear protection layer, since it is in direct contact with the material transported over the plate Prevents material with the pocket bottom. On the other hand, this cooling layer also acts as thermal insulation, so that the grate plates, at least in the area of the pockets, have a higher surface hardness due to the lower temperature and thus also a higher resistance to wear.

Es ist ferner bekannt, in die Taschen durch Öffnungen am Boden der Rostplatten Kühlluft einzublasen. Die Kühlluft durchströmt dann die transportierte, heiße Schüttgutschicht und speichert unter Kühllufttemperaturerhöhung Wärme, die gegebenenfalls an anderer Stelle des Gesamtprozesses wieder nutzbar gemacht, d.h. rekuperiert werden kann, wie dies bei der Zementherstellung der Fall ist. Die physikalisch technische Realisierung des Durchströmens der beförderten heißen Schüttgutschicht sowie des Bereiches der sich ausbildenden autogenen Verschleißschutzschicht ist entscheidend für die Effektivität und Gleichmäßigkeit des Kühlvorganges und die Standzeit der Rostplatten und mithin des Rostkühlers.It is also known to blow cooling air into the pockets through openings in the bottom of the grate plates. The cooling air then flows through the transported, hot bulk material layer and stores heat while increasing the cooling air temperature, which may be made usable elsewhere in the overall process, i.e. can be recuperated, as is the case with cement production. The physical and technical realization of the flow through the conveyed hot bulk material layer as well as the area of the autogenous wear protection layer that forms is decisive for the effectiveness and uniformity of the cooling process and the service life of the grate plates and thus the grate cooler.

Bei der in der angeführten Patentanmeldung (Aktenzeichen 10 2014 008 010.2 ) offenbarten Rostplatte werden durch deren (über den gesamten Arbeitsbereich dabei weitgehend unterschiedslose) Taschenanordnung / -beschaffenheit und durch deren Kühllufteinleitung mittels einer Öffnung an der Unterseite der Rostplatte eine Absenkung des Luftzufuhr- und Schüttgut-bedingten Luftwiderstands, der hohe Energiekosten zur Erzeugung des Kühlluftstroms (Verdichterleistung) zur Folge hat, ferner eine Vergleichmäßigung des Gesamtluftwiderstandes, dessen Schwankungen durch Regelmechanismen in der Kühlluftzufuhr (geregelter Verdichter) ausgeglichen werden müssen, sowie eine Verringerung des Verschleißes durch Ausbildung einer autogenen Verschleißschutzschicht auch im Überdeckungsbereich erreicht. Ähnliche Kühlerrostplatten mit Einrichtungen zur Anbringung auf einem Rostträger zum Abkühlen von heißem Gut sind auch aus jedem vom EP-A 0 337 383 , DE-A 42 05 534 und US-A 5 575 642 bekannt.In the case of the patent application (file number 10 2014 008 010.2 ) disclosed grate plate due to their pocket arrangement / quality (largely indistinguishable over the entire working area) and through their cooling air introduction by means of an opening on the underside of the grate plate, a lowering of the air supply and bulk material-related air resistance, the high energy costs for generating the cooling air flow ( Compressor output), the overall air resistance, the fluctuations of which have to be compensated for by regulating mechanisms in the cooling air supply (regulated compressor), and a reduction in wear by forming an autogenous wear protection layer also in the overlap area. Similar radiator grate plates with devices for mounting on a grate support for cooling hot goods are also from each of the EP-A 0 337 383 . DE-A 42 05 534 and US-A 5 575 642 known.

Dennoch bleibt es Ziel, Kühlung und Verschleißschutz weiter zu verbessern. Hierfür ist zu beachten, dass bei einer gleichartigen Taschengestaltung im Überdeckungsbereich wie im überdeckungsfreien Bereich es gerade im Überdeckungsbereich durch die oszillierende Hin-und-her-Schubbewegung über die Taschen nachteilig zu einer zunehmenden und erheblichen Verdichtung der Schüttgutschicht in den Taschen (im Vergleich zu der Verdichtung in den Taschen des überdeckungsfreien Bereichs) kommt. Dies führt hier zu einer erheblichen Erhöhung des Strömungswiderstands bzw. zu einem starken Druckverlust im Kühlluftstrom, was bei dessen Kompensation nicht nur kostenintensiv ist, sondern auch bei einer Gesamtluftzufuhr zum Rostkühler bzw. zu den jeweiligen Rostplatten im überdeckungsfreien, weniger stark verdichteten Bereich nachteilig eine Ausbildung von (vertikalen) Temperaturgradienten im Schüttgutbett zur Folge hat, die nicht zu einer optimalen effektiven und gleichmäßigen Kühlung des beförderten Schüttguts führen. Darüber hinaus wächst mit der solchermaßen notwendigen Erhöhung der Luftströmungsgeschwindigkeit im Zuführungsbereich nachteilig das Risiko von Durchschüssen bzw. Kaltkanalbildungen. Ferner kann, ebenfalls nachteilig, am Taschenboden im Überdeckungsbereich der durch die Verdichtung der Schüttgutschicht verstärkte, insbesondere Temperatur-bedingte Verschleiß durch Kühlung mittels Kühlluftzuleitung durch gewöhnlicher Öffnungen, die zur Unterseite der Rostplatte führen, nicht allgemein bereits hinreichend reduziert werden.Nevertheless, the goal remains to further improve cooling and wear protection. It should be noted that with a similar pocket design in the overlap area as in the overlap-free area, it is precisely in the overlap area due to the oscillating pushing movement back and forth over the pockets disadvantageous to an increasing and considerable compression of the bulk material layer in the pockets (compared to the compression in the pockets of the overlap-free area). This leads to a considerable increase in the flow resistance or to a strong pressure loss in the cooling air flow, which is not only cost-intensive when it is compensated for, but also disadvantageous in the case of a total air supply to the grate cooler or to the respective grate plates in the overlap-free, less compressed area of (vertical) temperature gradients in the bulk material bed, which do not lead to an optimal effective and uniform cooling of the bulk material being transported. In addition, with the increase in the air flow speed in the supply area necessary in this way, the risk of bullets or cold runner formation increases. Furthermore, likewise disadvantageously, the wear on the pocket base in the overlap region, in particular temperature-induced wear and tear due to the compression of the bulk material layer, cannot be sufficiently reduced in general by cooling by means of cooling air supply through normal openings which lead to the underside of the grate plate.

Aufgabe der Erfindung ist es daher, eine Rostplatte zum Einsatz in einem Rostkühler für heißes Schüttgut zur Verfügung zu stellen, welche die angeführten, Kühlungseigenschaften, Wirtschaftlichkeit und Verschleiß betreffenden Nachteile aus dem Stand der Technik überwindet oder zumindest abmindert.The object of the invention is therefore to provide a grate plate for use in a grate cooler for hot bulk material which overcomes or at least mitigates the disadvantages mentioned in the prior art relating to cooling properties, economy and wear.

Die erfindungsgemäße Aufgabe wird durch eine Rostplatte zum Einsatz in einem Rostkühler für heißes Schüttgut mit den Merkmalen des Anspruchs 1 gelöst. Weitere vorteilhafte Ausgestaltungen sind in den Unteransprüchen zu Anspruch 1 angegeben.The object of the invention is achieved by a grate plate for use in a grate cooler for hot bulk goods with the features of claim 1. Further advantageous refinements are specified in the subclaims to claim 1.

Nach der Erfindung ist also vorgesehen, dass die Höhe der mindestens einen Tasche im Überdeckungsbereich kleiner ist als die Höhe der mindestens einen Tasche im überdeckungsfreien Bereich. Bei Taschen, deren Böden im untypischen Falle nicht eben und horizontal beschaffen sind, ist hierbei von der mittleren Höhe auszugehen. Bei mehreren Taschen auf der Rostplatte, die unterschiedliche Höhe aufweisen, beispielsweise angepasst an die im Betrieb des Rostkühlers je typische Schüttungsgeometrie, ist mithin die tiefste, also mit der größten Höhe dimensionierte Tasche des Überdeckungsbereichs kleiner als die Tasche mit der geringsten Höhe des überdeckungsfreien Bereichs. Der Fachmann wird zunächst die Höhe der Taschen im Überdeckungsbereich optimierend dahingehend wählen, dass sich einerseits eine hinreichende autogene Verschleißschutzschicht in ihnen ausbildet, die jedoch andererseits eine nicht zu große Schichtdicke, welche den Strömungswiderstand bzw. Druckabfall unnötig erhöhen würde, aufweist. Hiervon ausgehend die Höhe der Taschen im Überdeckungsbereich erfindungsgemäß kleiner, typischerweise erheblich kleiner, einzurichten, ohne jedoch die Taschen so flach auszugestalten, dass keine Verschleißschutzschicht festgehalten werden könnte, führt dazu, dass die beschriebene Verdichtung der festgehaltenen Schüttgutschicht weniger stark ausfällt. Der Strömungswiderstand bzw. Druckverlust im Überdeckungsbereich ist daher gegenüber der Verwendung gleich hoher Taschen wie im überdeckungsfreien Bereich vorteilhaft vermindert, so dass die eingangs erläuterten Nachteile - insbesondere hinsichtlich einer unwirtschaftlichen Erhöhung der Luftzustromgeschwindigkeit, hinsichtlich temperatur-gefördertem Verschleiß in den Taschen des Überdeckungsbereichs und hinsichtlich Kühlungsnachteilen im überdeckungsfreien Bereich (ungünstige Temperaturgradienten, Kaltkanalrisiko) - abgeschwächt werden.According to the invention, it is therefore provided that the height of the at least one pocket in the coverage area is smaller than the height of the at least one pocket in the coverage-free area. In the case of bags, the bottoms of which, in the untypical case, are not level and horizontal, the average height must be assumed. If there are several pockets on the grate plate, the different ones Having a height, for example adapted to the bed geometry that is typical in the operation of the grate cooler, the deepest pocket of the overlap region, that is to say the one with the greatest height, is therefore smaller than the pocket with the lowest height of the uncovered region. The person skilled in the art will first choose the height of the pockets in the overlap area so that on the one hand a sufficient autogenous wear protection layer is formed in them, but on the other hand the layer thickness is not too great, which would unnecessarily increase the flow resistance or pressure drop. Based on this, the height of the pockets in the overlap area according to the invention to be smaller, typically considerably smaller, but without making the pockets so flat that no wear protection layer could be held on, leads to the described compression of the held bulk layer being less pronounced. The flow resistance or pressure loss in the cover area is therefore advantageously reduced compared to the use of pockets of the same height as in the cover-free area, so that the disadvantages explained at the outset - in particular with regard to an uneconomical increase in the air inflow speed, with regard to temperature-induced wear in the pockets of the cover area and with regard to cooling disadvantages in the area without overlap (unfavorable temperature gradients, cold runner risk) - are weakened.

Zugunsten einer vorteilhaften, möglichst einfachen Bauform werden in bevorzugter Ausführungsform die Taschen so gestaltet, dass die Taschen im Überdeckungsbereich untereinander die gleiche Höhe aufweisen, und die Taschen im überdeckungsfreien Bereich untereinander die gleiche Höhe aufweisen. Ferner ist vorgesehen, dass die Höhe der mindestens einen Tasche im Überdeckungsbereich kleiner ist als ein Drittel, bevorzugt kleiner als ein Fünftel, der Höhe der mindestens einen Tasche im überdeckungsfreien Bereich. Dabei ist hinsichtlich der unteren Grenze (geringste Höhe) auf die Ausbildungsmöglichkeit einer autogenen Verschleißschutzschicht zu achten. Dies ist abhängig von der Beschaffenheit des heißen Schüttguts, jedoch hat sich gezeigt, dass das Festhalten einer solchen Schicht für typische Rostkühleranwendungen, insbesondere bei der Zementklinkerkühlung, auch bei Höhen der genannten Höhenrelationen problemlos möglich ist. In einigen solchen Anwendungsfällen sollte die Höhe der Tasche im Überdeckungsbereich typischerweise nicht weniger als 5% der Taschenhöhe des überdeckungsfreien Bereichs betragen. Überraschend hat sich ferner gezeigt, dass bei einer solchen Reduzierung der Taschenhöhe (auf weniger als einem Drittel, bevorzugt weniger als einem Fünftel) gegenüber der Taschenhöhe des überdeckungsfreien Bereichs ein guter Verschleißschutz der Taschen im Überdeckungsbereich und eine effektive, gleichmäßige Kühlung im Gesamtbereich gewährleistet sind, was auf die alternierende Befreiung des Überdeckungsbereiches von einer heißen Gutbettschicht durch die oszillierende Hubbewegung zurückgeführt werden kann.In favor of an advantageous design that is as simple as possible, in a preferred embodiment the pockets are designed in such a way that the pockets have the same height in the overlapping area and the pockets have the same height in the overlapping area. It is further provided that the height of the at least one pocket in the overlap region is less than a third, preferably less than one fifth, of the height of the at least one pocket in the region without overlap. With regard to the lower limit (lowest level), the training opportunity is an autogenous one Wear protection layer. This depends on the nature of the hot bulk material, but it has been shown that holding such a layer for typical grate cooler applications, in particular for cement clinker cooling, is possible without problems even at heights of the height relationships mentioned. In some such applications, the height of the pocket in the coverage area should typically be no less than 5% of the pocket height in the coverage-free area. Surprisingly, it has also been shown that with such a reduction in the pocket height (to less than a third, preferably less than a fifth) compared to the pocket height of the area without overlap, good wear protection of the pockets in the area of overlap and effective, uniform cooling in the entire area are ensured, which can be attributed to the alternating removal of the overlap area from a hot bed layer by the oscillating lifting movement.

Nach der Erfindung ist ferner vorgesehen, dass der Boden der mindestens einen Tasche im Überdeckungsbereich von mehreren Segmenten gebildet wird, deren Oberseiten als Auflagefläche für Schüttgut dienen und zwischen denen spaltartige Kühlluftkanäle für die Zuführung von Kühlluft ausgebildet sind. Dabei sind bei Einsatz der Rostplatte in einem Rostkühler die zwischen den Oberseiten der Segmente gegebenen Öffnungen der Kühlluftkanäle jeweils in einem solchen Winkel zur Vertikalen ausgerichtet, dass zwischen der Förderrichtung des Schüttguts und der Richtung der Kühlluftströmung durch die Öffnungen je ein spitzer Winkel vorliegt. Eine so ausgebildete Art der Anströmung des Schüttguts, die, abgesehen von dann erfolgenden Ablenkungen und Verwirbelungen am und im Schüttgut, mit vektorieller Komponente überwiegend in Förderrichtung ausgerichtet ist, versorgt die Oberfläche der Rostplatte am Taschenboden, mithin die Segmentoberseiten, im Vergleich zu exakt nach oben gerichteten Öffnungen zusätzlich mit Kühlluft und reduziert auf diese Weise zusätzlich den temperaturbeförderten Verschleiß der Rostplatte.According to the invention, it is further provided that the bottom of the at least one pocket in the overlap area is formed by a plurality of segments, the upper sides of which serve as a support surface for bulk material and between which gap-like cooling air channels are formed for the supply of cooling air. When using the grate plate in a grate cooler, the openings of the cooling air ducts between the upper sides of the segments are each aligned at such an angle to the vertical that there is an acute angle between the conveying direction of the bulk material and the direction of the cooling air flow through the openings. A flow of bulk material designed in this way, which, apart from the deflections and swirling on and in the bulk material that then occur, is predominantly oriented in the conveying direction with vector components, supplies the surface of the grate plate on the pocket bottom, and consequently the tops of the segments, in comparison to exactly upwards directed openings additionally with cooling air and in this way additionally reduces the temperature-induced wear of the grate plate.

In bevorzugter Ausführung der Erfindung ist vorgesehen, dass die zwischen den Oberseiten der Segmente gegebenen Öffnungen der Kühlluftkanäle im Überdeckungsbereich so ausgerichtet sind, dass bei Einsatz der Rostplatte in einem Rostkühler die Kühlluftströmung etwa in Förderrichtung des Schüttguts eingeleitet wird. Mithin ist die Kühlluftströmung bei Einleitung etwa parallel zur Oberfläche der Segmente gerichtet, was sowohl den Verdichtungseffekt reduziert, wenn auch erfindungsgemäß nicht vollends verhindert (eine hinreichende autogene Verschleißschutzschicht wird festgehalten), als auch für eine bessere Kühlung der Segmente, mithin der Tasche sorgt. Kleine - durch den Ausdruck ,etwa' mit umfasste - Abweichungen gegenüber der exakten Förderrichtung bzw. Oberflächenausrichtung sind in der Praxis natürlich durch die physikalischen Eigenschaften der Kühlluftströmung, bspw. lokale Ablenkungen und kleine Verwirbelungen an Kanten, oder auch aufgrund möglicherweise nicht völlig ebener und/oder horizontaler Segmentoberflächen gegeben, beeinträchtigen aber die vorteilhafte Wirkung nicht nachhaltig. Nach in dieser Richtung erfolgter Einleitung der Kühlluftströmung kommt es zu Ablenkungen der Kühlluft an den Partikeln der Verschleißschutzschicht und, in der entsprechenden Phase des Schubzyklus, an den Partikeln des beförderten Schüttgutbetts.In a preferred embodiment of the invention, it is provided that the openings of the cooling air channels between the upper sides of the segments are aligned in the overlap area so that when the grate plate is used in a grate cooler, the cooling air flow is introduced approximately in the conveying direction of the bulk material. The cooling air flow is therefore directed approximately parallel to the surface of the segments, which both reduces the compression effect, although not completely prevented according to the invention (an adequate autogenous wear protection layer is retained), and also ensures better cooling of the segments, and therefore the pocket. Small - due to the expression, for example 'with included - deviations from the exact conveying direction or surface orientation are in practice of course due to the physical properties of the cooling air flow, for example local deflections and small eddies on edges, or also because of possibly not completely level and / or horizontal segment surfaces, but do not permanently impair the beneficial effect. After the cooling air flow has been introduced in this direction, the cooling air is deflected on the particles of the wear protection layer and, in the corresponding phase of the overrun cycle, on the particles of the bulk bed being conveyed.

Typischerweise sind funktional vorteilhaft in einem Rostkühler je mehrere Rostplatten in einer Reihe nebeneinander, d.h. quer zur Förderrichtung, und in einer Rostplatte die Taschen ihrerseits in Reihen quer und parallel zur Förderrichtung, also maschen- bzw. gitterartig, angeordnet. Hinsichtlich der Anordnung der den Boden der Taschen im Überdeckungsbereich bildenden Segmente sieht eine vorteilhafte Ausführungsform der Erfindung vor, dass in der mindestens einen Tasche im Überdeckungsbereich die den Boden bildenden Segmente bezogen auf die Förderrichtung hintereinander angeordnet sind. Durch die dabei spaltartig zwischen aneinander grenzenden Segmenten unterbrechungsfrei über die ganze Taschenbreite ausgebildeten Öffnungen der Kühlluftkanäle wird eine gleichmäßige Kühlung begünstigt. Gerade und dabei senkrecht zur Förderrichtung ausgebildete Segmentgrenzen erweisen sich hierbei als besonders vorteilhaft.Typically, several grate plates are functionally advantageously arranged in a row next to each other in a grate cooler, ie transversely to the conveying direction, and in a grate plate the pockets are in turn arranged in rows transversely and parallel to the conveying direction, that is to say in a mesh-like or grid-like manner. With regard to the arrangement of the segments forming the bottom of the pockets in the overlap area, an advantageous embodiment of the invention provides that in the at least one pocket in the overlap area the segments forming the bottom are arranged one behind the other in relation to the conveying direction. The openings of the cooling air channels, which are formed gap-like between adjacent segments without interruption over the entire width of the pocket, ensure a uniform opening Cooling favors. In this case, straight segment boundaries formed perpendicular to the conveying direction prove to be particularly advantageous.

Um die Rostplatte bei deren Verwendung mit dem Rostkühler, etwa mit dessen Rahmenkonstruktion oder dessen Antriebsgestänge, belastbar aber lösbar verbinden zu können, ist in vorteilhafter Ausgestaltung der Erfindung vorgesehen, dass an der Unterseite der Rostplatte unterhalb des Überdeckungsbereichs ein Verbindungselement, beispielsweise eine Hakenvorrichtung, für die Befestigung der Rostplatte in einem Rostkühler vorgesehen ist. Aus Gründen einer symmetrischen Kräftebelastung ist ein solcher Haken oder ein entsprechend anderes Verbindungselement vorzugsweise in der Unterseitenmitte, also in der vertikalen, parallel zur Förderrichtung verlaufenden Mittelebene der Rostplatte, anzuordnen. Unterhalb des Überdeckungsbereiches kommt es aufgrund der Funktionsweise des Rostkühlers nicht wiederum zu einer Überdeckung mit einer unterhalb dieser Platte befindlichen weiteren Rostplatte; vielmehr besteht dort ein freier Raum, der zu besagter Befestigung nutzbar ist. Für eine stabile Befestigung kann es sich als vorteilhaft erweisen, im Mittelbereich des Überdeckungsbereichs keine Taschen vorzusehen. In diesem Falle ist jedoch für eine ausreichende Kühlung dieses taschenfreien Mittelbereichs des Überdeckungsbereiches zu sorgen, etwa durch Lenkung des Kühlluftstroms der angrenzenden Taschen hin zum Mittelbereich.In order to be able to releasably but releasably connect the grate plate to the grate cooler when it is used, for example with its frame construction or its drive linkage, it is provided in an advantageous embodiment of the invention that on the underside of the grate plate a connection element, for example a hook device, for below the overlap area the grate plate is attached in a grate cooler. For reasons of symmetrical force loading, such a hook or a correspondingly different connecting element should preferably be arranged in the center of the underside, that is to say in the vertical center plane of the grate plate that runs parallel to the conveying direction. Below the overlap area, due to the functioning of the grate cooler, there is in turn no overlap with another grate plate located below this plate; rather, there is a free space that can be used for said attachment. For a stable attachment, it can prove to be advantageous not to provide pockets in the central area of the overlap area. In this case, however, adequate cooling of this pocket-free central region of the overlapping region must be ensured, for example by directing the cooling air flow from the adjacent pockets towards the central region.

Die Segmente bilden erfindungsgemäß mit ihren Oberseiten die Auflageflächen für das als Verschleißschutzschicht wirkende Schüttgut in den Taschen des Überdeckungsbereichs und mithin den Boden dieser Taschen. Die Oberseiten sind daher beispielsweise im Wesentlichen eben ausgebildet. Ferner müssen die Segmente den Kräftebelastungen durch das aufliegende und dabei mit Schubdruck beförderte heiße Schüttgut standhalten können und zwischen sich jeweils die erfindungsgemäßen Kühlluftkanäle ausbilden. Darüber hinaus besteht die nicht zuletzt wirtschaftlich relevante Bedingung, dass die Segmente einfach herstellbar sind. Wie sich gezeigt hat, sind diese Anforderungen in der bevorzugten Ausgestaltung der Erfindung erfüllt, bei der die Segmente der mindestens einen Tasche im Überdeckungsbereich in vertikalem Querschnitt parallel zur Förderrichtung ein etwa Doppelwinkelprofil aufweisen. Von einer Längsseite der (hier als horizontal gelagert angenommenen) Platte her, quer zu Förderrichtung, betrachtet weisen die Segmente also ein doppelgewinkeltes Profil mit unten einer horizontalen, flachen etwa quaderförmigen Komponente, einer an deren (in Förderrichtung gesehen) Ende anschließenden nach oben verlaufenden ebenfalls etwa quaderförmigen Komponente und mit einer an deren Ende ansetzenden, die Oberseite des Segmentes bildenden dritten, etwa horizontalen, etwa quaderförmigen Komponente in Förderrichtung auf, so dass im Profil die Form eines stilisierten, eckigen "S" gegeben ist. Die Form ist jedoch, wie der Ausdruck "etwa" anzeigen soll, nicht auf exakt rechte Innenwinkel zwischen den Komponenten festgelegt, vielmehr kann die Form auch leicht geschert, vorzugsweise in Förderrichtung geschert, vorliegen. Ferner können die Kanten zwischen den Komponenten aus Fertigungsgründen auch abgerundet sein; ebenfalls erfüllen auch leicht gebogene Komponenten die genannten Anforderungen. Um den erfindungsgemäßen Austritt der Kühlluft aus den Kühlluftkanälen zwischen den Segmenten unter einem Winkel zur Vertikalen, im Grenzfall sogar direkt in Förderrichtung bzw. parallel zu den Oberseiten der Segmente zu ermöglichen, können die doppelgewinkelten Segmente vorzugsweise mit in Transportrichtung gescherter Form ausgebildet und / oder mit ihren Oberseiten (in Transportrichtung absteigend) gestuft angeordnet werden oder auch mit entsprechend schräg gestellten oder abgeschrägten Oberseiten ausgebildet sein.According to the invention, the upper sides of the segments form the contact surfaces for the bulk material acting as a wear protection layer in the pockets of the overlap area and thus the bottom of these pockets. The tops are therefore essentially flat, for example. Furthermore, the segments must be able to withstand the loads of force due to the hot bulk material lying on top and conveyed with thrust pressure and must form the cooling air ducts according to the invention between them. Last but not least, there is an economically relevant condition that the segments are easy to manufacture. As has been shown, these requirements are met in the preferred embodiment of the invention, in which the segments of the at least one Pocket in the overlap area in vertical cross section parallel to the conveying direction have an approximately double angle profile. Viewed from a long side of the plate (here assumed to be horizontally mounted), transversely to the conveying direction, the segments thus have a double-angled profile with a horizontal, flat, approximately cuboidal component at the bottom, and also an upward-extending component at its end (seen in the conveying direction) approximately cuboidal component and with a third, approximately horizontal, approximately cuboidal component in the conveying direction, which attaches to the end of the segment and forms the top of the segment, so that the profile is given the shape of a stylized, angular "S". However, as the expression "about" is intended to indicate, the shape is not fixed to an exactly right internal angle between the components, rather the shape can also be slightly sheared, preferably sheared in the conveying direction. Furthermore, the edges between the components can also be rounded for manufacturing reasons; slightly curved components also meet the requirements mentioned. In order to enable the cooling air according to the invention to exit the cooling air ducts between the segments at an angle to the vertical, in the limit case even directly in the conveying direction or parallel to the upper sides of the segments, the double-angled segments can preferably be designed with a sheared shape in the transport direction and / or with their tops (descending in the direction of transport) can be arranged in stages or also be designed with correspondingly inclined or beveled tops.

Eine weitere vorteilhafte Ausgestaltung dieser Ausführungsform besteht darin, dass die Segmente der mindestens einen Tasche des Überdeckungsbereichs zumindest auf ihrer Oberseite mindestens je eine in Förderrichtung und dabei schräg zur Mitte der Quererstreckung des Überdeckungsbereichs verlaufende rippenartige Aufpanzerung aufweisen. Die aus den Kühlluftkanälen zwischen den doppeltgewinkelten Segmenten in oder annähernd in Förderrichtung ausgeführte Kühlluft wird somit zu einem Teil durch die Aufpanzerungen zur Mitte des Überdeckungsbereichs auf der Oberseite der Rostplatte gelenkt, wobei die Mitte der Plattenoberseite durch deren in Förderrichtung verlaufende Mittelachse gegeben ist. Durch die phasenweise hier gegebene Schüttungsgeometrie kann im mittleren Plattenbereich erhöhter Kühlbedarf gegeben sein. Insbesondere jedoch ist, wie oben bereits beschrieben, der mittlere Bereich des Überdeckungsbereichs in typischen Ausführungsformen taschenfrei, um eine Befestigung der Platte mit ihrer Unterseite am Rostkühler zu ermöglichen. Damit verfügt dieser Mittelbereich nicht über eine eigene Kühlung, was durch die Kühlluftlenkung an den Aufpanzerungen kompensiert wird. Die Aufpanzerungen, typischerweise gegeben als Auftragsschweißungen, sind dabei aus besonders verschleißfestem Material gefertigt, da sie aufgrund ihrer exponierten Position hoher abrasiver und temperaturbedingter Verschleißeinwirkung ausgesetzt sind.A further advantageous embodiment of this embodiment consists in that the segments of the at least one pocket of the covering area have at least on their top side at least one rib-like armor extending in the conveying direction and thereby obliquely to the center of the transverse extent of the covering area. The cooling air which is carried out from the cooling air ducts between the double-angled segments in or approximately in the conveying direction thus becomes part of the armoring to the center of the coverage area steered on the top of the grate plate, the center of the plate top being given by its central axis running in the conveying direction. Due to the bed geometry given here in phases, there may be increased cooling requirements in the middle plate area. In particular, however, as already described above, the central region of the overlap region in typical embodiments is pocket-free in order to enable the underside of the plate to be fastened to the grate cooler. This means that this central area does not have its own cooling, which is compensated for by the cooling air routing on the armouring. The armor plates, typically given as build-up welds, are made of particularly wear-resistant material, because due to their exposed position they are exposed to high abrasive and temperature-related wear.

Eine andere vorteilhafte weitere Ausführungsform ist dadurch gegeben, dass die Segmente der mindestens einen Tasche des Überdeckungsbereichs mindestens je eine Luftleitrippe aufweisen, die beginnend im Bodenbereich der Rostplatte und über das jeweilige Segment verlaufend Kühlluft bis auf die Oberseite des Segments leitet. Hierdurch wird zusätzlich Kühlluft in Regionen der Oberseite des doppelgewinkelten Segments geleitet, die aufgrund der ausgebildeten autogenen Verschleißschutzschicht und der damit gegebenen Kühlluftumlenkung, insbesondere nach oben, ansonsten nur eine ggf. unzureichende Kühlung erfahren. Eine schräg nach innen verlaufende Anordnung der Luftleitrippen erbringt die in der vorangehend beschriebenen Ausführungsform durch die Aufpanzerungen gegebenen Vorteile einer verstärkten Kühlung des mittleren Bereichs des Überdeckungsbereichs durch teilweise Umlenkung des Kühlluftstroms aus den spaltartigen Kühlluftkanälen zwischen den Segmenten.Another advantageous further embodiment is given in that the segments of the at least one pocket of the cover area each have at least one air guide rib, which guides cooling air starting in the bottom area of the grate plate and running over the respective segment up to the top of the segment. As a result, cooling air is additionally conducted in regions of the upper side of the double-angled segment which, due to the autogenous wear protection layer and the cooling air deflection that is provided, in particular upwards, otherwise experience inadequate cooling. An obliquely inward arrangement of the air-guiding ribs provides the advantages given by the armouring in the above-described embodiment of increased cooling of the central region of the overlap region by partially deflecting the cooling air flow from the gap-like cooling air channels between the segments.

In vorteilhafter Ausgestaltung der Erfindung ist vorgesehen, dass bei den Taschen im überdeckungsfreien Bereich die mindestens eine zur Unterseite der Rostplatte führende Öffnung für die Einleitung von Kühlluft so angeordnet ist, dass bei Einsatz der Rostplatte in einem Rostkühler die Öffnungsrichtung einen Winkel zur Vertikalen aufweist. Ist die Öffnung für die Kühlluftzuführung beispielsweise als zylindrischer Kanal gegeben, so ist die Längsachse dieser Röhre nicht senkrecht positioniert, sondern bildet einen spitzen Winkel zur vertikalen Richtung. Analog verhält es sich bei hiervon abweichend, aber zweckentsprechend geformten Öffnungen, insofern sich hierbei zumindest der zum Taschenboden hin gelegene Mündungsbereich der Öffnung durch einen Zylinder approximieren lässt, so dass die Abweichung von der Vertikalen auf dessen Achse bezogen ist. Die zur Vertikalen hin projektiv verkleinerte Öffnungsmündung und der angewinkelte Öffnungsverlauf führen dazu, dass sich leichter und nach Betriebsaufnahme schneller größere Partikel des heißen Schüttguts, z. B. größere Zementklinkergranalien, in dem Kühlluftzuführungskanal festsetzen und dann vorteilhaft eine Barriere für nachrieselndes Schüttgut bilden, wodurch der Rostdurchfall reduziert wird.In an advantageous embodiment of the invention, it is provided that in the pockets in the overlap-free area, the at least one opening leading to the underside of the grate plate for the introduction of cooling air is arranged such that when the grate plate is used in a grate cooler, the opening direction is one Has an angle to the vertical. If the opening for the cooling air supply is, for example, a cylindrical channel, the longitudinal axis of this tube is not positioned vertically, but forms an acute angle to the vertical direction. The same applies to openings which are shaped differently, but appropriately, insofar as at least the mouth region of the opening towards the pocket bottom can be approximated by a cylinder, so that the deviation from the vertical is related to its axis. The projectively reduced opening mouth towards the vertical and the angled opening course mean that larger particles of the hot bulk material, e.g. B. larger cement clinker granules, fix in the cooling air supply channel and then advantageously form a barrier for trickling bulk material, whereby the rust diarrhea is reduced.

Bei gattungsgemäßem Einsatz von Rostplatten in einem Rostkühler wird das Schüttgut durch Schub mittels der in Förderrichtung gelegenen Stirnseite der sich bewegenden Rostplatten nach Art einer Förderkante befördert. Die Rostplatten weisen daher an ihrer vorne gelegenen Stirnseite eine Schubkante auf. Bei den sich nicht bewegenden Rostplatten erfüllt diese die Funktion einer Gegenfläche bei möglichen Bewegungen des Schüttgutes gegen die Förderrichtung während des alternierenden Bewegungszyklus der sich bewegenden Rostplattenreihen. In bevorzugter Ausgestaltung der Erfindung weist die Rostplatte wirtschaftlich günstig eine austauschbare Schubkante auf, da die Schubkante besonders starkem Verschleiß ausgesetzt ist. Durch die Ausdehnung der Schubkante in vertikaler, senkrecht zur Förderrichtung liegender Richtung wird die Größe des Spalts zu der in Förderrichtung nächsten Rostplatte eingestellt.When using grate plates of the generic type in a grate cooler, the bulk material is conveyed by thrust by means of the end face of the moving grate plates in the conveying direction in the manner of a conveying edge. The grate plates therefore have a push edge on their front face. In the case of the non-moving grate plates, this fulfills the function of a counter surface in the event of possible movements of the bulk material against the conveying direction during the alternating movement cycle of the moving grate plate rows. In a preferred embodiment of the invention, the grate plate has an exchangeable push edge in an economically advantageous manner, since the push edge is exposed to particularly heavy wear. The size of the gap to the grate plate closest to the conveying direction is set by the expansion of the pushing edge in the vertical direction perpendicular to the conveying direction.

Die Erfindung wird anhand der folgenden Figuren näher erläutert. Es zeigt:

Fig. 1
eine perspektivische Ansicht der erfindungsgemäßen Rostplatte,
Fig. 2a
eine Aufsicht auf die Rostplatte mit eingetragener Schnittebene,
Fig. 2b
die Rostplatte aus Fig. 2a im Querschnitt entlang dieser Schnittebene,
Fig. 3a
eine Aufsicht auf die Rostplatte mit weiterer Schnittebene,
Fig. 3b
die Rostplatte aus Fig. 3a im Querschnitt entlang dieser weiteren Schnittebene, insbesondere mit Schnitt durch die Segmente,
Fig. 4
eine perspektivische Ansicht zweier übereinander arbeitender Rostplatten, und
Fig. 5
einen schematischen Schnitt durch zwei übereinander angeordnete Rostplattenteile mit Aufpanzerungen.
The invention is illustrated by the following figures. It shows:
Fig. 1
a perspective view of the grate plate according to the invention,
Fig. 2a
a top view of the grate plate with entered cutting plane,
Fig. 2b
the grate plate Fig. 2a in cross-section along this cutting plane,
Fig. 3a
a top view of the grate plate with another cutting plane,
Fig. 3b
the grate plate Fig. 3a in cross-section along this further sectional plane, in particular with a section through the segments,
Fig. 4
a perspective view of two stacked grate plates, and
Fig. 5
a schematic section through two stacked grate plate parts with armor.

In Figur 1 ist eine erfindungsgemäße Rostplatte 1 dargestellt, deren Oberseite sich zusammensetzt aus einem ersten Arbeitsbereich, dem Überdeckungsbereich 2, und einem zweiten Arbeitsbereich, dem überdeckungsfreien Bereich 3. Beim Einsatz dieser Rostplatte 1 in einem Rostkühler fällt heißes Schüttgut (nicht dargestellt) von der darüber befindlichen Rostplattenstufe auf den Überdeckungsbereich 2 und wird von dort durch die oszillierende Hin-und-her-Bewegung der darüber befindlichen Rostplatte(n) 1 in den überdeckungsfreien Bereich 3 geschoben. Das Zusammenspiel zweier solcher gestuft angeordneten Rostplatten 1 ist in Figur 4 (sowie in Figur 5 ) dargestellt. Auf hintereinander folgenden Stufen wechseln sich dabei beweglich gelagerte mit statisch feststehenden Reihen von Rostplatten 1 ab. Beispielsweise kann in den Abbildungen die obere Rostplatte 1 als beweglich und oszillierende Schubbewegungen ausführend angenommen werden, während die untere Rostplatte 1 ortsfest ist. Auf diese Weise wird Schüttgut (nicht abgebildet), das von der oberen Rostplatte 1 in den Überdeckungsbereich 2 der unteren Rostplatte 1 gefallen ist, durch die Schubkante 4 der oberen Rostplatte 1 in den überdeckungsfreien Bereich 3 der unteren Rostplatte 1 geschoben und beim nächsten Schubzyklus durch nachkommendes Schüttgut von der unteren Rostplatte 1 über deren Schubkante 4 befördert. In allen Abbildungen ist die Förderrichtung also (abzüglich perspektivischer Verdrehungen) von links nach rechts gerichtet. Die Schubkante 4 der jeweils oberen Rostplatte 1 überlappt bei maximaler Vorschubposition also gerade den gesamten Überdeckungsbereich 2 der darunter liegenden Rostplatte 1, erreicht aber nicht den überdeckungsfreien Bereich 3.In Figure 1 A grate plate 1 according to the invention is shown, the upper side of which is composed of a first work area, the overlap area 2, and a second work area, the overlap-free area 3. When this grate plate 1 is used in a grate cooler, hot bulk material (not shown) falls from the grate plate step above it onto the overlap area 2 and is pushed from there by the oscillating back and forth movement of the grate plate (s) 1 located above into the overlap-free area 3. The interaction of two such grate plates 1 arranged in steps is shown in FIG Figure 4 (as in Figure 5 ). On successive stages, movably mounted rows of rust plates 1 alternate with statically fixed rows. For example, in the figures the upper grate plate 1 can be assumed to be movable and oscillating pushing movements, while the lower grate plate 1 is stationary. In this way, bulk material (not shown) that has fallen from the upper grate plate 1 into the overlap area 2 of the lower grate plate 1 is pushed through the shear edge 4 of the upper grate plate 1 into the overlap-free area 3 of the lower grate plate 1 and through at the next push cycle coming bulk goods conveyed from the lower grate plate 1 over its push edge 4. In all figures, the conveying direction (minus perspective twists) is therefore from left to right. The thrust edge 4 of the upper grate plate 1 in each case thus overlaps the maximum overlap area 2 of the grate plate 1 underneath at maximum feed position, but does not reach the overlap-free area 3.

Die Rostplatte 1 verfügt im überdeckungsfreien Bereich 3 über Taschen 5, die bevorzugt, wie im dargestellten Ausführungsbeispiel, reihenweise und quer zur Förderrichtung angeordnet sind. In diesen wird im Betrieb des Rostkühlers Schüttgut zurückgehalten, das eine autogene Verschleißschutzschicht (nicht abgebildet) für die Taschen 5 im überdeckungsfreien Bereich 3 bildet. Im Kontakt mit dieser Schicht wird das Schüttgutbett über die Rostplatte 1 transportiert. Im Boden der Taschen 5 im überdeckungsfreien Bereich 3 sind Öffnungen 6 angeordnet, die zur Unterseite der Rostplatte 1 führen und durch die Kühlluft in die Verschleißschutzschicht und die darauf befindliche, beförderte Gutbettschicht geblasen wird. Die Taschen 5 im überdeckungsfreien Bereich 3 verfügen über eine für die Ausbildung der Verschleißschutzschicht gerade ausreichende Höhe 7, wie sie in Figur 2b sowie in Figur 3b eingezeichnet ist. Auch im Überdeckungsbereich 2 sind Taschen 5 angeordnet (s. Figur 1 ), die eine solche Höhe 8 (s. Figur 3b und Figur 5 ) aufweisen, dass auch sie im Betrieb eine autogene Verschleißschutzschicht (nicht abgebildet) festhalten.The grate plate 1 has pockets 5 in the overlap-free region 3, which are preferably arranged in rows and transverse to the conveying direction, as in the exemplary embodiment shown. Bulk material is retained in the grate cooler during operation, which forms an autogenous wear protection layer (not shown) for the pockets 5 in the overlap-free area 3. In contact with this layer, the bulk bed is transported over the grate plate 1. Openings 6 are arranged in the bottom of the pockets 5 in the overlap-free area 3, which lead to the underside of the grate plate 1 and are blown through the cooling air into the wear protection layer and the conveyed good bed layer located thereon. The pockets 5 in the overlap-free area 3 have a height 7 which is just sufficient for the formation of the wear protection layer, as shown in FIG Figure 2b as in Figure 3b is drawn. Pockets 5 are also arranged in the overlap area 2 (see FIG. Figure 1 ), which has such a height 8 (s. Figure 3b and Figure 5 ) that they also hold an autogenous wear protection layer (not shown) during operation.

Erfindungsgemäß wird der Boden der Taschen 5 im Überdeckungsbereich 2 von den Oberseiten je mehrerer Segmente 9 gebildet. Diese Oberseiten dienen als Auflageflächen für die Verschleißschutzschicht aus zurückgehaltenem Schüttgut. Zwischen den im abgebildeten Ausführungsbeispiel hintereinander angeordneten Segmenten 9 einer Tasche 5 sind spaltartige Kühlluftkanäle 10 für die Zuführung von Kühlluft ausgebildet. Erfindungsgemäß ist ferner die Höhe 8 der Taschen 5 im Überdeckungsbereich 2 wesentlich kleiner (kleiner als ein Drittel, bevorzugt kleiner als ein Fünftel) der Höhe 7 der Taschen 5 im überdeckungsfreien Bereich 3, wie insbesondere auch in Figur 3b erkennbar ist. Zusammen mit dem erfindungsgemäßen Merkmal, gemäß dem die Kühlluft mehr in Förderrichtung statt vertikal nach oben, im Grenzfall sogar in Förderrichtung aus dem Kühlluftkanal 10 ausgeblasen und in das Schüttgut eingeblasen wird, wird insgesamt eine besonders hohe Verdichtung der Verschleißschutzschicht im Überdeckungsbereich 2 verhindert und eine effektive und gleichmäßige Kühlung des Schüttguts, bspw. Zementklinker aus einem Drehrohrofen, in beiden Arbeitsbereichen 2 und 3 erreicht, da insgesamt kein nachteilig hoher Druckverlust ausgeglichen werden braucht. Gleichzeitig ist dennoch, wie sich gezeigt hat, ein ausreichender Verschleißschutz auch bei den Taschen 5 im Überdeckungsbereich 2 gewährleistet.According to the invention, the bottom of the pockets 5 in the overlap region 2 is formed by the upper sides of several segments 9 each. These tops serve as contact surfaces for the wear protection layer made of retained bulk material. Between the segments 9 of a pocket 5 arranged one behind the other in the illustrated embodiment, gap-like cooling air channels 10 are formed for the supply of cooling air. According to the invention, the height 8 of the pockets 5 in the overlap area 2 is also substantially smaller (less than a third, preferably less than a fifth) of the height 7 of the pockets 5 in the overlap-free area 3, as in particular also in Figure 3b is recognizable. Together with the feature according to the invention, according to which the cooling air is blown out of the cooling air duct 10 more in the conveying direction instead of vertically upward, in the limiting case even in the conveying direction, and blown into the bulk material, overall a particularly high compression of the wear protection layer in the overlap region 2 is prevented and an effective one and uniform cooling of the bulk material, for example cement clinker from a rotary kiln, is achieved in both work areas 2 and 3, since overall no disadvantageously high pressure loss needs to be compensated for. At the same time, as has been shown, adequate wear protection is also ensured for the pockets 5 in the overlap area 2.

In Figur 2b ist die entlang der Schnittlinie A-A aus Figur 2a entstehende Querschnittsdarstellung durch die Rostplatte 1 gezeigt. Um die Rostplatte 1 kraftschlüssig, aber lösbar in dem Rostkühler befestigen zu können, ist als Verbindungselement ein Haken 11 im Mittelbereich der Unterseite der Rostplatte 1 unter dem Überdeckungsbereich 2 angeordnet. Aus Stabilitätsgründen befindet sich oberhalb des Hakens 11 keine Tasche, sondern eine Materialfläche hinreichender Dicke.In Figure 2b is along the section line AA Figure 2a resulting cross-sectional view through the grate plate 1 shown. In order to be able to non-positively but releasably fasten the grate plate 1 in the grate cooler, a hook 11 is arranged as a connecting element in the central region of the underside of the grate plate 1 under the overlap region 2. For reasons of stability, there is no pocket above the hook 11, but a material surface of sufficient thickness.

Die Querschnittsdarstellung in Figur 3b , die entlang der in Figur 3a eingezeichneten Schnittlinie B-B entsteht, zeigt insbesondere das bevorzugte Ausführungsbeispiel von Segmenten 9 mit einem Doppelwinkelprofil. Durch die leichte Scherung eines doppelt rechtwinkligen Doppelwinkelprofils in Förderrichtung wird ein Ausblasen der Kühlluft aus den Kühlluftkanälen 10, d.h. aus den durch sie gegebenen Öffnungen zwischen den Oberseiten, die durch das je rechts benachbarte, schrägseitige Segment 9 mit einem Winkel von der Vertikalen abweichen, überwiegend in Förderrichtung begünstigt. Ein Schrägstellen der Oberseiten der Segmente 9 und eine damit gegebene zusätzliche Ausrichtung der oberen Öffnungsmündungen der Kühlluftkanäle 10 in einem zusätzlichen Winkel gegen die Vertikale könnte dies noch weiter befördern.The cross-sectional representation in Figure 3b that along the in Figure 3a drawn section line BB, shows in particular the preferred embodiment of segments 9 with a double angle profile. Due to the slight shear of a double-right-angled double-angle profile in the conveying direction, blowing out of the cooling air from the cooling air ducts 10, that is to say from the openings between the upper sides given by them, which deviate at an angle from the vertical due to the adjacent right-angled segment 9, is predominant favored in the direction of funding. An inclination of the upper sides of the segments 9 and a given additional alignment of the upper opening openings of the cooling air channels 10 at an additional angle to the vertical could further promote this.

In der Ausführungsform der erfindungsgemäßen Rostplatten 1 v.a. aus Figur 1 und Figur 4 sind die doppelgewinkelten Segmente mit einer zusätzlichen Luftleitrippe 12 versehen, die Kühlluft weit auf die Oberseite des jeweiligen Segments 9 leitet und somit den Kühleffekt und Verschleißschutz noch verbessert. Die zusätzlichen Luftleitrippen 12 leiten durch die dargestellte Schrägstellung die Kühlluft aus dem Kühlluftkanal 10 zwischen den Segmenten 9 in Richtung zur Mitte des Überdeckungsbereiches 2, wo die Rostplatte 1 im Ausführungsbeispiel wegen darunter angebrachter Befestigungskomponenten 11 nicht über einer Tasche 5 und mithin auch nicht über eine Kühlung oder wärmeisolierende Verschleißschutzschicht verfügt.In the embodiment of the grate plates 1 according to the invention Figure 1 and Figure 4 the double-angled segments are provided with an additional air-guiding rib 12, which guides the cooling air far to the top of the respective segment 9 and thus further improves the cooling effect and wear protection. The additional air guiding ribs 12 guide the cooling air from the cooling air duct 10 between the segments 9 in the direction of the center of the overlap area 2, where the grate plate 1 in the exemplary embodiment does not have a pocket 5 and therefore also does not have cooling due to the fastening components 11 attached underneath or heat-insulating wear protection layer.

Der Effekt einer Umleitung von Kühlluft zur Mitte des Überdeckungsbereiches wird auch in Ausführungsformen mit einer entsprechend schräg angeordneten, rippenartigen Aufpanzerung 13 erreicht, beispielsweise gegeben durch eine Auftragsschweißung 13, wie sie in Figur 5 dargestellt ist. In Figur 5 ist ferner nicht nur eine vorteilhafte Austauschbarkeit der besonderen Belastungen ausgesetzten Schubkante 4 angedeutet (bei der oberen der beiden Rostplatten 1). Vielmehr ist auch erkennbar, dass durch die Dimensionierung der Schubkante 4 die Größe des Spaltes zur nächsten Rostplatte bestimmt wird. BEZUGSZEICHENLISTE 1 Rostplatte 8 Höhe (Tasche im berdecku ngsbereich) 2 Überdeckungsbereich 3 überdeckungsfreier Bereich 9 Segment 4 Schubkante 10 Kühlluftkanal 5 Tasche 11 Haken 6 Öffnung 12 Luftleitrippe 7 Höhe (Tasche im überdeckungsfreien Bereich) 13 Aufpanzerung The effect of a diversion of cooling air to the center of the overlap area is also achieved in embodiments with a correspondingly obliquely arranged, rib-like armor 13, for example given by a cladding weld 13 as shown in FIG Figure 5 is shown. In Figure 5 not only is an advantageous interchangeability of the pushing edge 4 exposed to special loads indicated (in the upper of the two grate plates 1). Rather, it can also be seen that the size of the gap to the next grate plate is determined by the dimensioning of the shear edge 4. <I> LIST OF REFERENCES </ i> 1 grate plate 8th Height (pocket in the coverage area) 2 Coverage area 3 area without overlap 9 segment 4 thrust edge 10 Cooling air duct 5 bag 11 hook 6 opening 12 Luftleitrippe 7 Height (pocket in the area without overlap) 13 armouring

Claims (10)

  1. Grate plate (1) for use in a grate cooler for hot bulk material having
    - a first operating region ("covering region") (2) which is alternately covered by at least one additional grate plate (1) when the grate plate (1) is used in a grate cooler,
    wherein the covering region (2) has at least one pocket (5) for retaining bulk material as an autogenous wear protection layer, and
    - a second operating region ("non-covering region") (3) which is not covered by an additional grate plate (1) when the grate plate (1) is used in a grate cooler,
    wherein the non-covering region (3) for retaining bulk material as an autogenous wear protection layer has at least one pocket (5) having at least one opening (6) which leads to the lower side of the grate plate (1) for the introduction of cooling air,
    characterized in that
    - the height (8) of the at least one pocket (5) in the covering region (2) is smaller than the height (7) of the at least one pocket (5) in the non-covering region (3), and in that
    - the base of the at least one pocket (5) in the covering region (2) is formed by a plurality of segments (9) whose upper sides act as a support face for bulk material and between which gap-like cooling air channels (10) are formed for the supply of cooling air,
    wherein, when the grate plate (1) is used in a grate cooler, the openings of the cooling air channels (10) which are produced between the upper sides of the segments (9) are each orientated at such an angle with respect to the vertical that there is an acute angle in each case between the conveying direction of the bulk material and the direction of the cooling air flow through the openings.
  2. Grate plate (1) according to Claim 1,
    characterized in that
    - the pockets (5) in the covering region (2) have the same height (8) with respect to each other,
    - the pockets (5) in the non-covering region (3) have the same height (7) with respect to each other, and in that
    - the height (8) of the at least one pocket (5) in the covering region (2) is smaller than a third, preferably smaller than a fifth of the height (7) of the at least one pocket (5) in the non-covering region (3).
  3. Grate plate (1) according to either Claim 1 or 2,
    characterized in that
    the openings of the cooling air channels (10) produced between the upper sides of the segments (9) in the covering region (2) are orientated in such a manner that, when the grate plate (1) is used in a grate cooler, the cooling air flow is introduced substantially in the conveying direction of the bulk material.
  4. Grate plate (1) according to one of Claims 1 to 3,
    characterized in that
    in the at least one pocket (5) in the covering region (2) the segments (9) which form the base are arranged one behind the other with respect to the conveying direction.
  5. Grate plate (1) according to one of Claims 1 to 4,
    characterized in that
    the segments (9) of the at least one pocket (5) in the covering region (2) have in vertical cross-section parallel with the conveying direction a substantially dual-angled profile.
  6. Grate plate (1) according to Claim 5,
    characterized in that
    the segments (9) of the at least one pocket (5) of the covering region (2) have at the upper side thereof at least one rib-like reinforcement (13) which extends in the conveying direction and in this instance obliquely relative to the center of the transverse extent of the covering region (2).
  7. Grate plate (1) according to Claim 5,
    characterized in that
    the segments (9) of the at least one pocket (5) of the covering region (2) each have at least one air guiding rib (12) which beginning in the base region of the grate plate (1) and extending over the respective segment (9) directs cooling air as far as the upper side of the segment (9).
  8. Grate plate (1) according to one of Claims 1 to 7, characterized in that
    in the non-covering region (3) the at least one opening (6) which leads to the lower side of the grate plate (1) for the introduction of cooling air is arranged in such a manner that, when the grate plate (1) is used in a grate cooler the opening direction has an angle with respect to the vertical.
  9. Grate plate (1) according to one of Claims 1 to 8,
    characterized in that
    the grate plate (1) has a replaceable pushing edge (4).
  10. Grate plate (1) according to one of Claims 1 to 9,
    characterized in that
    at the lower side of the grate plate (1) below the covering region (2) a connection element (11), for example, a hook device (11), is provided for securing the grate plate (1) in a grate cooler.
EP16801210.2A 2015-12-03 2016-11-24 Grate plate for a grate cooler Active EP3384221B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015015632.2A DE102015015632B4 (en) 2015-12-03 2015-12-03 Grate plate for a grate cooler
PCT/EP2016/078659 WO2017093111A1 (en) 2015-12-03 2016-11-24 Grate plate for a grate cooler

Publications (2)

Publication Number Publication Date
EP3384221A1 EP3384221A1 (en) 2018-10-10
EP3384221B1 true EP3384221B1 (en) 2020-01-01

Family

ID=57394572

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16801210.2A Active EP3384221B1 (en) 2015-12-03 2016-11-24 Grate plate for a grate cooler

Country Status (7)

Country Link
US (1) US20180363985A1 (en)
EP (1) EP3384221B1 (en)
CN (1) CN108291777B (en)
DE (1) DE102015015632B4 (en)
DK (1) DK3384221T3 (en)
ES (1) ES2781466T3 (en)
WO (1) WO2017093111A1 (en)

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE970380C (en) * 1955-02-23 1958-09-11 Moeller Johannes Device for cooling cement clinker
DE3812425A1 (en) * 1988-04-14 1989-10-26 Peters Ag Claudius RADIATOR GRID PLATE
JPH0222155A (en) * 1988-07-07 1990-01-25 Kurimoto Ltd Grate plate
DE4134242A1 (en) * 1991-10-16 1993-04-22 Krupp Polysius Ag COOLING GRID
DE4205534A1 (en) * 1992-02-24 1993-08-26 Kloeckner Humboldt Deutz Ag Grid plate for push grid cooler for hot material - is suitable for hot cement clinker and has troughs on its upper side for accommodation of clinker so as to protect the grid plate against overheating.
DE4421552A1 (en) * 1994-01-24 1995-07-27 Krupp Polysius Ag Chill grate cooler
DE4412885A1 (en) * 1994-04-14 1995-10-19 Krupp Polysius Ag Cooling grate
US5575642A (en) * 1995-12-01 1996-11-19 The Carondelet Corporation Grate plate
CH700197B1 (en) * 2006-02-02 2010-07-15 Mertec Ag Cooling plate used in a pushing grate cooler for cooling clinker comprises a ventilated surface with openings in a recess or pocket of the plate
DE102009009285B4 (en) * 2009-02-17 2013-11-28 Ikn Gmbh A grate plate arrangement
DE102011080998B4 (en) * 2011-08-16 2016-07-14 IKN GmbH Ingenieurbüro-Kühlerbau-Neustadt Cooling grid and grate segment for cooling cement clinker
CN202304448U (en) * 2011-10-08 2012-07-04 广州圣嘉机电设备有限公司 Grate plate of grate cooler
CN202361815U (en) * 2011-10-11 2012-08-01 成都建筑材料工业设计研究院有限公司 Low-resistance non-material-spilling grate plate
DE102014008010B4 (en) * 2014-06-05 2018-11-29 Khd Humboldt Wedag Gmbh Grate plate for a grate cooler

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
CN108291777B (en) 2019-12-20
EP3384221A1 (en) 2018-10-10
WO2017093111A1 (en) 2017-06-08
ES2781466T3 (en) 2020-09-02
DE102015015632B4 (en) 2017-12-07
CN108291777A (en) 2018-07-17
DE102015015632A1 (en) 2017-06-08
US20180363985A1 (en) 2018-12-20
DK3384221T3 (en) 2020-03-23

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