EP2044378B1 - Device for the cooling of bulk products - Google Patents

Abstract

The device for cooling bulk material e.g. cement clinker from upstream process stage of oven, comprises a grate (3) with a mechanism for supplying cooling gas, a tub for arranging a supporting structure and a dispersion element on its edge, and a material sump intended to a conveying direction (60) on the side of the dispersion element. The grate conveys a layer of the bulk material along the conveying direction, has conveying elements and forms an even support surface for the layer of the bulk material. The support surface is partly provided with a laminar exhaust mechanism. The device for cooling bulk material e.g. cement clinker from upstream process stage of oven, comprises a grate (3) with a mechanism for supplying cooling gas, a tub for arranging a supporting structure and a dispersion element on its edge, and a material sump intended to a conveying direction (60) on the side of the dispersion element. The grate conveys a layer of the bulk material along the conveying direction, has conveying elements and forms an even support surface for the layer of the bulk material. The support surface is partly provided with a laminar exhaust mechanism that comprises a spatially enlarged dispersion element, on which the bulk material directly rests, and the supporting structure arranged under it. The tub has a supply connection at the bottom for the cooling gas. The dispersion element and the supporting structure are combined into modules, which are arranged exchangeably at the grate and which are intended in matrix arrangement. Footpaths projecting on the grate and or its boards are arranged in the bulk material transverse to the conveying direction. The supporting structure connects the together-bordering modules directly to each other, and is formed as a supporting grid, which is arranged on plate elements arranged in cross connection. The dispersion element and the supporting structure are arranged in a movable element of the grate. The dispersion element is formed from the support surface of the grate in projecting manner. Frames that are oriented in the conveying direction, are intended on the boards, which form troughs holding together with the footpaths. The frames are arranged at sidewalls of the boards. An additional frame is arranged at inner side of a sealing section of the boards.

Description

The invention relates to a device for cooling bulk material comprising a grate conveying a layer of the bulk material along a conveying direction with a device for supplying cooling gas, wherein the grate comprises conveying elements and forms a substantially planar support surface for the layer of bulk material.

Devices of the type mentioned serve as a grate cooler in particular for cooling burned Good, for example for emerging from an upstream furnace cement clinker. The bulk material dropped from the upstream workstation, usually the furnace, is transported along the cooling grid to the downstream workstation and thereby cooled. In order to cool the bulk material located on the grate, the grate cooler has a feed for cooling gas. This is usually done by blowing cooling gas through the grate so that it enters from below into the bulk material to be cooled, flows through it and leaves upwards. Difficulties often arise in the supply of cooling gas from the fact that for effecting the promotion of the bulk material along the cooling grate parts of the grate are designed to be movable. From this and from the goal of the most uniform possible supply of cooling gas results in a complicated guidance of the cooling gas through the cooling gas device. This results in pressure losses, which increase the energy consumption of the cooling device. A further difficulty is that in some embodiments of the cooling devices, conveyor elements for effecting conveyance of the bulk material are movably guided from below through the grate surface must be, which increases the design effort. In addition, the conveying elements are exposed to high wear within the hot layer of the bulk material, which is why they must be more strongly dimensioned to achieve adequate reliability and service life. However, in those areas of the cooling grate in which the conveying elements and their drive means are located, the air flow rate for the cooling gas is reduced and thus the cooling effect is limited. It has been shown that even with a modern cooling grate ( DE-U-202004020574 ) there is nevertheless an undesirably high flow resistance, in particular in the region of the exit of the cooling gas, and the distribution of the cooling gas over the surface of the grate is uneven. Remedy by simply increasing the exit area for the cooling gas is not possible, as this would cause a diarrhea of bulk material in the grate subspace, with the result of damage to the conveyor elements.

The invention is based on the object to provide, starting from the above-mentioned prior art, an improved cooling grate which avoids the disadvantages mentioned.

The solution according to the invention is in a cooling grate with the features of claim 1. Advantageous developments are the subject of the dependent claims.

In a device for cooling bulk material, which has a grate conveying a layer of the bulk material along a conveying direction with a device for supplying cooling gas, wherein the grate comprises conveying elements and forms a substantially flat support surface for the layer of bulk material, according to the invention provided that the support surface is at least partially provided with a flat blower, which is a tissue as a spatially extended dispersion element, on which the bulk material rests directly, and having a supporting structure arranged underneath.

The invention is based on the idea of creating a composite by means of the dispersion element and the support structure arranged directly underneath, which on the one hand provides a large outlet area for the cooling gas, and on the other hand is sufficiently robust for supporting the overlying layer of the bulk material to be cooled. The fabric provides a plurality of small passageways for the cooling gas. Depending on whether a more or less fine dispersion is to be achieved, the fabric may consist of nonwoven material or of metallic material (wire mesh). Due to its structure, on the one hand, it provides a large area for the passage of cooling gas and, on the other hand, prevents rust throughput, ie the falling through of bulk material to be cooled into the space below the grate, due to the smallness of the channels (or mesh or pores) conducting the cooling gas. Small means a width of the channels, which is considerably smaller than particles of the bulk material. The support structure ensures that the tissue, which is not sufficiently stable in itself, is given sufficient mechanical strength and load-bearing capacity. In addition to the mechanical effect of the invention described this further achieved that due to the better air distribution through the fabric on the one hand improved heat exchange of the cooling and thus lower energy costs are achieved and on the other hand, the pressure losses incurred at entry of the cooling gas over known designs of cooling grates are reduced so far that Further significant energy savings can be achieved.

From the DE-A-2 345 734 is a cooling grate is known in which the support surface is formed as a perforated plate, on which rests on a layer of the bulk material to be cooled and on the underside of a fabric material is arranged. The fabric material can act as a dispersion element for supplied from below cooling gas. The perforated plate arranged above the fabric material protects the fabric material from wear. Although this construction achieved with the above the fabric arranged perforated plate as a support good wear protection for the fabric material, however, results from the provided in the perforated plate openings for the passage of the cooling gas, a considerable increase in the flow resistance. The efficiency of the cooling thereby deteriorates. Another disadvantage of the above the fabric arranged support member, namely the perforated plate is that material from the layer of bulk material to be cooled can fall into the openings of the perforated plate, and thus block it or at least to hinder the passage of the cooling gas. Especially under the harsh operating conditions of a clinker cooler, this construction proves to be much in need of improvement.

A particular advantage of the arrangement of the support structure directly under the fabric as a dispersion element is that a reliable mechanical support is achieved. Ausackungen or depressions under the load of the weight of the overlying layer of the bulk material to be cooled no longer occur thanks to the invention. The burden on the dispersion element can thus be reduced thanks to the invention. This not only allows the use of thinner material, such as the inherently delicate fabric material, for the dispersive element, but also reduces the susceptibility of the construction to damage.

Conveniently, a trough is provided, in which the support structure and on the edge of the dispersion element are arranged, wherein the trough on the bottom side a supply port for the cooling gas. With such a tub, a separate unit is created, which can be manufactured separately from the grid and mounted. This allows a simpler and more efficient production. Conveniently, the composite of dispersion element and support structure is designed as an exchangeable module. This makes it possible to provide standardized modules, which only need to be used on appropriately prepared receiving points of the grate. Production and assembly are thus considerably easier. It is also possible with the execution as a module, if necessary, easily make an exchange.

In an embodiment as a module, it is expedient to provide a matrix arrangement. In particular, it has proven useful in cooling grids according to the "walking floor" principle with several parallel side by side longitudinally displaceable in the conveying direction and alternately back and forth moving planks several modules in the conveying direction to be arranged one behind the other.

In a particularly advantageous embodiment, webs projecting into the bulk material are arranged transversely to the conveying direction. By means of the webs, an area is formed in which the bulk material resting directly on the dispersion element does not or hardly moves, up to a certain layer thickness influenced by the web height. This part of the bulk material layer is thus virtually calm with respect to the dispersion element. It thus forms another protection, which automatically develops during operation, from wear by the bulk material to be cooled. The dispersion element is so by the bottom layer of the bulk material to be cooled, which is due to the arranged transversely to the conveying direction webs quasi-stationary to the respective element of the grate, from wear by the rest, due to their abrasive Components often spares bulk wear-aggressive bulk.

Next, a material sump is expediently provided parallel to the conveying direction of the side of the dispersion element in the support grid. It serves to provide a collecting space downwards from the layer of the bulk material to be conveyed, which migrates away from the bulk material, in particular fine dust constituents. It has been found that otherwise the downwardly migrating fines could clog the dispersing element. Through the material sump it is achieved that this material accumulates in the space created by the material sump. As a result, the dispersion element can be protected from clogging, and any remaining small amounts of fine constituents that may still be present on it can be discharged thanks to the cooling gas flow passed through the dispersion element. The material sump may have any desired shape in cross-section, in particular it may be square, rectangular or even round.

Preferably, it can be provided that the dispersion element is formed across several adjacent modules. The term "overlapping" is understood here to mean that a uniform piece of the dispersion element spans the area of a plurality of support structures which adjoin one another, in particular in the conveying direction. As a result, abutting edges between the dispersion elements and possibly resulting sealing problems are avoided. In addition, the cost of production is reduced, and the maintenance is facilitated accordingly in a possibly required replacement of the dispersion element. The support structures can in this case be arranged at a certain distance from each other, but it is more expedient to arrange them directly adjacent to one another. this makes possible a maximum extent of the area used for blowing out cooling gas.

The support structure is preferably formed by a plurality of cross member arranged plate elements. This allows a rational and at the same time mechanically stable design of the support structure as a support grid. The plate elements may be provided with slot-like recesses corresponding to the width of the support grid to allow mating of the plate elements to the support structure. This allows a particularly simple production. Appropriately, the plate elements are designed so that they are the same shape. It can be further provided that they are equal in length, but this is not absolutely necessary. Already with the identical design of the plate elements for the support structure, a significant reduction in the variety of parts, and thus a simplified production can be achieved.

In principle, the inventive composite of dispersion element and support structure can be arranged in a fixed part or a movable part of the cooling grid. It can also be provided a combined arrangement. However, a particular advantage of the construction according to the invention lies in the fact that it is due to their simplicity and in particular their modular design to an arrangement in a movable element of cooling grates suitable. In this case, the dispersion surface can be arranged so that it is positioned between the remaining space for conveying elements for the layer of the bulk material to be cooled. Thus, the use of the cooling grid according to the invention is also possible in such Brenngutkühlern having separate (and not as in the "walking-Floor" principle in the actual grate integrated) conveying elements. Conveniently, the dispersion element is such that its grid width is less than 1 mm. The term "grid width" hereby means the width of a channel leading through the dispersion element for the supply of cooling gas. With this width, sufficient safety can be achieved with respect to an undesirable entry of bulk material, without resulting in an unnecessarily high pressure loss with respect to penetrating or falling bulk material.

Fig. 1

einen schematischen Längsschnitt durch einen Küh- ler gemäß der Erfindung;

Fig. 2

einen Teil-Querschnitt eines Kühlers gemäß einer ersten Ausführungsform;

Fig. 3

eine Teil-Aufsicht auf den in Fig. 2 dargestellten Kühler;

Fig. 4

einen Teil-Querschnitt eines Kühlers gemäß einer zweiten Ausführungsform;

Fig. 5

eine Queransicht eines Dispersionselements eines Kühlers gemäß einer dritten Ausführungsform;

Fig. 6

eine Aufsicht auf das in Fig. 5 dargestellte Dis- persionselement;

Fig. 7

einen Querschnitt einer Planke des Rosts gemäß ei- ner vierten Ausführungsform;

Fig. 8

eine perspektivische Teilansicht der gemäß Fig. 7 dargestellten Planke ;

Fig. 9

eine perspektivische Teilansicht eines Kühlers ge- mäß einer fünften Ausführungsform;

Fig. 10

einen Teil-Querschnitt der in Fig. 9 dargestell- ten Ausführungsform;

Fig. 11

einen Teil-Querschnitt eines Kühlers mit gesonder- ten Förderelementen und zwei verschiedenen Ausfüh- rungen der Dispersionselemente gemäß einer sechs- ten Ausführungsform;

Fig. 12

einen Teil-Querschnitt eines Kühlers gemäß einer siebten Ausführungsform;

Fig. 13

einen Teil-Querschnitt eines Kühlers gemäß einer achten Ausführungsform;

Fig. 14

einen Teil-Querschnitt eines Kühlers gemäß einer Kombination aus den in Fig. 11 und 12 dargestell- ten Ausführungsformen.

The invention will be explained below with reference to the accompanying drawing, in which an advantageous embodiment is shown. Show it:

Fig. 1

a schematic longitudinal section through a cooler according to the invention;

Fig. 2

a partial cross section of a radiator according to a first embodiment;

Fig. 3

a partial supervision on the in Fig. 2 illustrated cooler;

Fig. 4

a partial cross section of a radiator according to a second embodiment;

Fig. 5

a transverse view of a dispersion element of a radiator according to a third embodiment;

Fig. 6

a supervision on the in Fig. 5 illustrated dispersion element;

Fig. 7

a cross section of a plank of the grate according to a fourth embodiment;

Fig. 8

a partial perspective view of the according Fig. 7 plank shown;

Fig. 9

a partial perspective view of a radiator according to a fifth embodiment;

Fig. 10

a partial cross-section of in Fig. 9 illustrated embodiment;

Fig. 11

a partial cross section of a cooler with separate conveyor elements and two different embodiments of the dispersion elements according to a sixth embodiment;

Fig. 12

a partial cross section of a cooler according to a seventh embodiment;

Fig. 13

a partial cross section of a radiator according to an eighth embodiment;

Fig. 14

a partial cross-section of a radiator according to a combination of the in FIGS. 11 and 12 illustrated embodiments.

A schematic embodiment of cooler according to the invention is in Fig. 1 shown. A housing 1 has at one end to a feed chute 12, in which a discharge end of a rotary kiln 2 opens. From the rotary kiln 2 dropped bulk material to be cooled, which is hereinafter referred to as refrigerated goods falls in the feed chute 12 on a task section 14 of the radiator and passes from there to an inventively designed grate 3. This is formed substantially horizontally and forms a support and transport surface for the refrigerated goods. The refrigerated goods lying on the grate 3 is cooling gas from below through the grate. 3 fed. By means of a conveyor, the material is transported along the grate 3 in a conveying direction 60 to a discharge end 16. Via an optionally arranged discharge section 18, the chilled goods then fall to a downstream processing stage, for example to a crusher 8.

In the first exemplary embodiment, it is provided that the grate 3 is formed from a plurality of planks 31 arranged parallel in the conveying direction 60. The planks are individually movable back and forth and are driven by a motion controller so that they are advanced together and moved back individually. This conveying principle for cooling grates is known as "walking floor" ( DE-A-19651741 ); to the explanation of details on structure and operation can therefore be omitted. A cross-sectional view through a plank 31 of the grate 3 is shown in FIG Fig. 2 shown. The plank 31 has upstanding cheeks 32 at its side edges facing the adjacent planks 31 '. The two cheeks 32 of a plank 31 form side boundaries of a trough. To protect against unwanted ingress of refrigerated goods in the space between adjacent cheeks 32, 32 'is a the upper ends of the cheeks 32, 32' cross-sealing profile 33 is provided. Optionally, a delimiting cheek 32 "is arranged next to the cheek 32 on the side of the plank 31 facing the sealing profile 33. This ensures that fine particles of the bulk material resulting from the relative movement between the individual planks can not reach the dispersion element.

The plank 31 forms with its top a support surface for the refrigerated goods. On the underside of the planks 31 supply means, not shown, are arranged for cooling gas, of which cooling gas is supplied to the planks 31. To the Connection of the feeders, the planks 31 on its underside connecting piece 40.

At the top of the plank according to the invention executed blow-out devices 4 are provided, which through the planks 31 through the cooling gas is supplied from the connecting piece 40. The construction of one of the blow-off devices 4 will be explained in more detail below. It is of generally box-like shape. The upper side is double-layered with a flat expanded dispersion element and a support element. The dispersion element is formed by a metal mesh 41 in this embodiment. It spans the entire top of the blower 4. It lies on a support structure designed as a support grid 42, which supports the metal fabric 41 from below. The support grid 42 is formed from a plurality of plate-like segments 43, which are joined together in a cross-compound. The upper edges of the segments 43 are in one plane and form a support for the metal fabric 41. This ensures that the metal fabric 41 is not deformed or damaged even under the weight of a resting layer of goods to be cooled. The cooling gas supplied via the connecting piece 40 is distributed between the segments 43 of the support grid 42, so that it is supplied to the metal fabric 41 from below. It flows through the metal fabric 41, wherein it is finely distributed and large area of the metal fabric 41 enters the overlying layer of material. This results in both a large-scale and uniform transfer of the cooling gas into the refrigerated goods. The upcoming low cooling gas velocities on the one hand cause a low pressure loss and on the other hand an optimal cooling of the chilled goods. Both together allow a low energy consumption. The metal fabric 41 is sufficiently fine-meshed to prevent unwanted falling through of goods to be cooled by the metal fabric 41.

In order to further counteract the risk of clogging of the blow-out device 4 by means of refrigerated goods, a material sump 5 can be provided between the blow-off devices 4. It serves to provide a receiving space for durchfallendes refrigerated goods. The risk of clogging of the metal fabric 41 is further reduced.

Like the supervision in Fig. 3 shows, the blower 4 may also have other than a box-like contour. The embodiment of the blower 4 described above is in the lower part of the Fig. 3 shown by solid lines. In the upper area of the Fig. 3 a variant is shown in which the blower has a cylindrical contour. For their construction, the above statements apply mutatis mutandis.

In a second embodiment of the invention, which in Fig. 4 is shown, the blower 4 is designed in the form of a basin 44 which extends over almost the entire width of the plank 31. With this embodiment, in comparison to that in the FIGS. 2 and 3 illustrated embodiment achieves an enlargement of the available for the exit of the cooling gas surface. This results in an even better and above all more uniform cooling effect. Also in this embodiment, a material sump 5 may be provided. It is arranged on the longitudinal sides of the basin 44 'and partially extends below the bottom of the basin 44. For supplying the cooling gas, a central connecting piece 40 or a direct flow of cooling gas over the entire width is provided in the bottom of the basin 44.

A third embodiment of the invention is in the FIGS. 5 and 6 shown. The blow-out devices are at this Embodiment designed in modular design. A cross section through such a module, provided in its entirety by the reference numeral 47, shows Fig. 5 , It comprises a trough 45 with optionally inclined edges, to which the metal fabric 41 is clamped by means of edge strips 46. The edge strips 46 are fastened in the illustrated embodiment by means of a screw on the edge of the trough 45; but it can also be provided another type of fastening, which provides sufficient fastening security. Immediately below the metal mesh 41, the support structure 42 is arranged. It is designed so that its lower edge along its outer sides with an inclination corresponding to that of the edges of the trough 45 is executed. The support grid 42 can be used so self-centering in the trough 45. The metal fabric 41 is placed on the support structure 42 and fastened by means of the edge strips 46. The bottom of the trough 45 has a large-area opening for the supply of cooling gas. Thus, the module 47 needs to be inserted only in its place to the specific element for its inclusion of the grate 3, whereby it is automatically centered thanks to the inclined edges 46 in its receiving position and the connection to the taking place from below cooling gas supply. As a rule, it is sufficiently securely locked by its own weight and that of the overlying chilled goods, but if desired, separate fastening elements (not shown) can also be provided for greater securing of the fastening. In Fig. 6 a plan view of a module 47 is shown.

In the FIGS. 7 and 8 an alternative embodiment is shown in which viewed in the conveying direction 60 behind the blower 4 a projecting into the refrigerated goods web 34 is arranged. It is understood that the adjacent blower 4 in the conveying direction also with such Bridge 34 are provided. The webs 34 are expediently arranged along the boundary sides of the dispersion element 41 which are oriented transversely to the conveying direction. This ensures that at both transverse to the conveying direction 60 oriented boundary sides of the blower 4 each one of the webs 34 is arranged. The webs 34 serve to form depressions on the grate 3, in which refrigerated goods accumulates during operation of the cooler. This deposition occurs as a layer that is not moved along the conveying direction 60 during normal operation of the cooler, but remains quasi-stationary with respect to the respective area of the surface of the grate 3; in a "walking flor", this layer moves in accordance with the forward and backward movements of the plank 31. The limited by the webs 34 troughs hold during operation so refrigerated goods. They are therefore also referred to as "well-holding wells". The quasi-stationary arranged in the respective trough part of the refrigerated product performs substantially no relative movement to the plank 31. This means that the dispersion element 41 'is not or only minimally loaded by abrasive components of the bulk material. The risk of damaging the dispersion element 41 'is thus minimized. Here, the support structure 42 'may be formed to further reduce the flow resistance. The support grid 42 'is integrated into the surface of the grate 3. In addition, the quasi-stationary material layer located between the webs 34 acts as a filter that does not allow particles below a certain size to pass. All this makes it possible to perform the dispersion element 41 'comparatively weitmaschig, for example, as an industry-standard wire mesh. In this embodiment, a large-area blow-out is achieved, which in addition, thanks to the large average cross-section in this area can have a high throughput. A separate connection for the cooling gas at a bottom of the blower is not required. The supply of cooling gas is achieved by providing the refrigerant gas with overpressure in the space below the grate 3. This results in a simple structure a wear-protected and working with low pressure drop blow-out.

In FIGS. 9 and 10 is a modification of the embodiment according to Fig. 3 shown. It differs essentially in that a dispersion element 41 "extends longitudinally (parallel to the conveying direction 60) over a plurality of support structures 42 ' when the cooler is a "walking floor" principle. Collision edges between adjoining dispersion elements 41 "and any resulting sealing problems are avoided in this case Moreover, the assembly and the replacement of the dispersion element are simplified since only one dispersion element 41" is to be removed or installed. The overall arrangement of the dispersion element 41 "offers particular advantages in this case when the blow-off devices 4, in particular the support grids 42 ', are designed in the modular construction explained above.

The blow-off devices 4 according to the present invention are not limited to an application to moving elements of the grate 3. It can also be provided to arrange them or instead on stationary elements of the grate 3. This is especially true for such Brenngutkühler that have separate from the grate 3 conveying elements for the refrigerated goods.

In FIGS. 11 and 12 Sixth and seventh embodiments are shown in which the blow-out devices 4 according to the invention are connected to or between moving separate conveying elements the grate of the combustor are arranged. In the embodiment according to Fig. 11 is a stationary grate 3 'is provided, which has a plurality of juxtaposed separate conveyor elements 6. These are guided longitudinally movable in parallel to the conveying direction 60 slots in the grid 3 'and moved by a drive device, not shown. In the spaces between the conveying elements 6 are a (right half of Fig. 11 ) or more (left half of Fig. 11 ) Blowout 4 arranged. They may be formed according to one of the embodiments described above. They are arranged so that they stand up out of the surface of the grate 3. This ensures that spaces are formed between them, which act as a material sump 5. In the embodiment according to Fig. 12 the blow-off devices are embedded flush in the top of the grate 3 '. This arrangement has the advantage of a uniform surface, whereby a more uniform loading of the cooling product is favored with cooling gas. In addition, in this embodiment, the area provided for the blow-off devices 4 and thus the total effective blow-out area can be maximized. A separate material sump is not provided in this embodiment; to reduce the breakdown of refrigerated goods serves a denser version of the metal fabric 41. Due to the denser design resulting larger flow resistance fall because of the large Ausblasfläche not negatively.

In Fig. 13 is a variant of the embodiments according to Fig. 11 shown as the eighth embodiment, in which the blow-out devices are not arranged on the stationary part of the grate 3 ', but on the movable conveying elements 6'. The structure of the blow-out 4 corresponds to the above. One difference lies in the way in which cooling gas is supplied. It will be from below via an inter Longitudinal bearings 61 of the conveying elements 6 'arranged arranged connecting piece, and passed over an integrated into the conveying element 6' riser 64 to the arranged at the upper end of the conveying element blowout device 4. In this embodiment, an uncooled and almost stationary layer of the material is generated in operation, which rests on the top of the grate 3 '. It does not participate in the processes of cooling and conveying. It forms a kind of stationary protective layer of the grate 3 'against wear. Since the temperature of this layer corresponds approximately to that of the grate 3 ', cooling of this layer is unnecessary and is also avoided thanks to the increased arrangement of the blow-off devices 4 at the upper end of the conveying elements 6'. The arrangement of the blow-out at the top of the conveying elements 6 'ensures that the cooling gas is supplied only at the lower limit of the moving goods to be cooled. This minimizes losses due to flow resistance and thus achieves high efficiency.

In Fig. 14 a variant is shown as a ninth embodiment, which is essentially a combination of the sixth and seventh embodiments. In this embodiment, the conveying elements extend across the entire radiator width. The blow-out devices 4 according to the invention are designed either as separate modules above or as an integral part of the stationary cooling grid 3 ".

Claims (15)

1. Apparatus for cooling bulk material, having a grate (3) that has a device for feeding cooling gas and conveys a layer of the bulk material along a conveying direction, the grate (3) comprising conveying elements (31, 6) and forming a substantially smooth supporting surface for the layer of the bulk material, the supporting surface being provided at least partially with a planar blowout device (4), characterized in that the blowout device has a fabric (41) as spatially extended dispersion element on which the bulk material directly rests, and a support structure (42) arranged thereunder.
2. Apparatus as claimed in Claim 1, characterized in that a trough (45) is provided in which the support structure (42) and on the edge of which the fabric (41) are arranged, the trough (45) having a feed connection (40) for the cooling gas on the bottom side.
3. Apparatus as claimed in Claim 1 or 2, characterized in that the fabric (41) and the support structure (42) are combined to form a module (47) that is arranged exchangeably on the grate (3).
4. Apparatus as claimed in Claim 3, characterized in that a number of modules (47) are provided in a matrix arrangement.
5. Apparatus as claimed in one of the preceding claims, characterized in that webs (34) projecting into the bulk material are arranged transverse to the conveying direction (60) on the grate (3) and/or its planks (31).
6. Apparatus as claimed in one of the preceding claims, characterized in that a material sump (5) is provided to the side of the fabric (41) in the conveying direction (60).
7. Apparatus as claimed in one of Claims 3 to 6, characterized in that the fabric (41) is constructed such that it spreads over a number of bordering modules (47).
8. Apparatus as claimed in Claim 7, characterized in that the support structures (42) of the mutually bordering modules (47) directly adjoin one another.
9. Apparatus as claimed in one of the preceding claims, characterized in that the support structure (42) is designed as a supporting grid.
10. Apparatus as claimed in Claim 9, characterized in that the supporting grid is constructed from plate elements (43) arranged in a cross connected fashion.
11. Apparatus according to one of the preceding claims, characterized in that the fabric (41) and the support structure (42) are arranged in a moveable element (31) on the grate (3).
12. Apparatus as claimed in one of the preceding claims, characterized in that the fabric (41) projects from the supporting surface of the grate (3).
13. Apparatus as claimed in one of Claims 5 to 12, characterized in that cheeks (32) oriented in the conveying direction are provided on the grate (3), preferably its planks (31), and together with the webs (34) form material-holding hollows.
14. Apparatus as claimed in Claim 13, characterized in that the cheeks (32) are arranged on the long side of the planks.
15. Apparatus as claimed in Claim 14, characterized in that an additional cheek (32") is arranged on the inside of a sealing profile of the plank (31).

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