EP2179220B1 - Liquid-cooled grill plate comprising wear plates and stepped grill made of such grill plates - Google Patents

Description

So far, for a liquid-cooled grate for waste incineration, water-cooled grate plates, such as those made, for example, have been installed EP 0 621 449 emerge, and which are arranged in a staircase overlapping arranged to form a step grate. Each grate step is in the running direction of the entire grate forward and backward displaced to produce a stoking and transport movement for the lying on the grate kiln.

These liquid-cooled grate plates are made of steel, which is about 10-12 mm thick, is bent and then welded together in two half-shells, creating a cavity through which the cooling fluid, such as cooling water, a suitable oil or a specific components offset Coolant can flow. For example, Hardox is used for the surface, because it is much harder, ie ordinary steel and therefore more resistant to wear. On the other hand, Hardox is temperature sensitive and softens above about 280 °. Welding is done to avoid Hardach's hardness in a water bath to continuously remove heat from the weld, because the temperature of Hardox must remain below about 280 ° C, because Hardox remains hard only up to this temperature. After welding, the grate plate must be directed because it is inevitably distorted by the welding, because when welding arise in very local areas high temperatures and in the plate large temperature gradients. It is known in the prior art to provide separate wear plates at those points of the grate plate tops where the cascaded superimposed grate plates touch each other and wear occurs due to their advancing movement. These can be replaced if necessary, so that the main body of the grate plate can continue to be used. The wear plates can for example be placed directly on the base body and welded to them, or else be fastened by means of screw on the base body.

In these solutions mentioned here, the wear plates are placed directly on the cooled grate plates. Although these wear plates macroscopically rest on the cooled grate plates, it turns out that the heat transfer from the wear plate to the cooled grate plate is very limited. Accordingly, the liquid cooling of the underlying cooled grate plate is less effective. Because the underside of the wear plates on the one hand as well as the tops of the cooled grate plates on the other hand are microscopically uneven, resulting in many small air gaps and the plates are microscopically seen only pointwise or small elevations really on each other and touch only there full, so that only on These places an effective heat transfer takes place, while everywhere else the air gaps have an insulating effect.

In these constructions mentioned above, the grate plate, through which liquid flows, forms a grate step, the upper side of which is provided with wear plates. The production of such a grate plate is very labor intensive, but many waterproof welds must be placed to assemble the grate plate made of sheet metal parts watertight. To supply primary air to the fire through the liquid cooled grate plate tube sections are welded into the interior of the grate plate, which they break from bottom to top. Each of these pipe sections must be very carefully welded into the base and cover plate of the grate plate, so that the tightness is guaranteed. These welding jobs are demanding and time-consuming. The grate plates thus produced are therefore prone to defective processing and repair in the case of detecting leaks is difficult. The reprocessing of such grate plates is complex and expensive. In addition, due to the many weld seams, deformations occur during machining, which necessitate a subsequent straightening of the grate plate, and this straightening in turn involves the risk that the grate plate will leak somewhere. Out US Pat. No. 3,263,655 A is a construction with a flow-through heat sink known, which consists of a series of parallel, round water pipes (water pipes) 32, which open at the ends in each case a cross header 32. There are so-called T-shaped members 50 placed on these tubes 32, and the rods 50 must have on their underside cylinder-segment-like bulges, so that they enclose the tubes 32 around a circular segment. Between the tubes 32 and the rods a plastic thermally conductive aluminum binding material is clamped.

The object of the present invention is therefore to provide a liquid-cooled grate plate and a grate consisting of such grate plates, wherein the single grate plate of non-temperature-sensitive, cheap iron or steel to be produced, but should still provide the required wear resistance by using replaceable wear plates is equipped. However, this grate plate should be a fault-tolerant structure with much less water Have welds and allow much simpler and cheaper production and repair if possible than conventional constructions, and remain dimensionally stable even in overheating. At the same time, a significantly improved heat transfer from the wear plate to the liquid-cooled grate plate should be achieved with this grate plate, so that the cooling effect is hardly limited despite the attached wear plate.

This tube plate is made of a drivable support structure with a drive structure for this single grate plate, further with a separate, insertable into this support structure through-flow heat sink, as well as spanned on this heat sink wear plates, said grate plate is characterized by the features of claim 1.

Figur 1:

Die Trägerkonstruktion einer einzelnen Rostplatte;

Figur 2:

Die Trägerkonstruktion mit Antriebskonstruktion einer einzelnen Rostplatte;

Figur 3:

Den flüssigkeitsgekühlten Kühlkörper der Rostplatte;

Figur 4:

Die Träger- und Antriebskonstruktion mit darin eingelegtem Kühlkörper und darauf aufgelegter Wärmeleitfolie;

Figur 5:

Die Träger- und Antriebskonstruktion mit darin eingelegten Kühlkörper und darauf unter Einklemmung der Wärmeleitfolie verspannten Verschleissplatten;

Figur 6:

Eine alternative Träger- und Antriebskonstruktion ohne Querrippen im Innern;

Figur 7:

Einen alternativen Kühlkörper mit Durchbrüchen in der Front zum Festschrauben der Front-Verschleissplatten;

Figur 8:

Die Träger- und Antriebskonstruktion nach Figur 6 mit darin eingelegtem Kühlkörper nach Figur 7;

Figur 9:

Diese Träger- und Antriebskonstruktion mit darin eingelegtem Kühlkörper und darauf unter Einklemmung der Wärmeleitfolie verspannten Verschleissplatten;

Figur 10:

Diese Träger- und Antriebskonstruktion in einer Ansicht von unten gezeigt, mit darin eingelegtem Kühlkörper und darauf unter Einklemmung der Wärmeleitfolie verspannten Verschleissplatten;

Figur 11:

Eine Schnittdarstellung quer durch einen flüssigkeitsgekühlten Stufenrost mit zwei Rostbahnen aus je zwei benachbarten miteinander verschraubten Rostplatten mit je inliegendem gesondertem Kühlkörper;

Figur 12:

Eine Schnittdarstellung quer durch die zentrale Planke des flüssigkeitsgekühlten Stufenrostes mit zwei Rostbahnen;

Figur 13:

Eine Schnittdarstellung quer durch eine Seitenplanke des flüssigkeitsgekühlten Stufenrostes mit zwei Rostbahnen.

With reference to the drawings, the invention will be further described and its function will be explained.
It shows:

FIG. 1:

The support structure of a single grate plate;

FIG. 2:

The support structure with drive construction of a single grate plate;

FIG. 3:

The liquid-cooled heat sink of the grate plate;

FIG. 4:

The carrier and drive construction with inserted therein heat sink and heat transfer film applied thereto;

FIG. 5:

The carrier and drive construction with inserted therein heat sink and clamped under clamping of the heat conducting foil wear plates;

FIG. 6:

An alternative carrier and drive construction without transverse ribs in the interior;

FIG. 7:

An alternative heat sink with openings in the front for screwing the front wear plates;

FIG. 8:

The carrier and drive construction according to FIG. 6 with inserted therein heat sink after FIG. 7 ;

FIG. 9:

This support and drive construction with inserted therein heat sink and clamped under clamping of the heat conducting foil wear plates;

FIG. 10:

This carrier and drive construction shown in a view from below, with inserted therein heat sink and clamped thereon under entrapment of the heat conducting wear plates;

FIG. 11:

A cross-sectional view across a liquid-cooled step grate with two grate paths of two adjacent grate plates screwed together with each separate separate heat sink;

FIG. 12:

A cross-sectional view across the central plank of the liquid-cooled step grate with two grate webs;

FIG. 13:

A cross-sectional view across a side plank of the liquid-cooled step grate with two grate webs.

As in FIG. 1 shown, the support structure of a single grate plate forms a skeleton of structural steel. This is made of a number of welded steel sheets 1-10. Specifically, here are the to Plate plane perpendicular side walls 1,2 and the parallel arranged rib pieces 3-6 welded on its rear side with a rear wall 7, on its front side with an angle section 8 and in the middle part with a horizontal middle plate 9. The rib pieces 3-6 have a stepped upper edge, so that space is created for inserting a heat sink, which then rests on these ribs 3-6 and on the center plate 9. On this center plate 9 is here a connecting strip 10, the upper edge is flush with the upper edges of all other vertical parts 1-6 concludes. At the front edge of the angle section 8, a fastening strip 11 is welded, which is equipped with holes 12 for attachment of wear shoes 13, which, as shown, have a U-shaped profile and on which the grate plate after installation in a grate finally on the top of next lower grate plate rests. On the one side of the skeleton, a tunnel-like opening 14 is provided from behind, which serves to insert a drive construction.

In FIG. 2 the support structure with the installed drive unit 15 is shown. This drive unit 15 consists of a hydraulic cylinder-piston unit 16, of which here the tab 17 is visible at the end of the piston rod. This tab 17 is firmly connected to a bolt on the skeleton of the grate plate construction. The hydraulic cylinder-piston unit 16 is housed inside a square tube 18 protected and firmly connected to the same. At the rear end of the square tube 18 can be seen a bore 19, by means of which this square tube 18 and the inboard cylinder-piston unit 16 is fixedly connected to a grate base. When extending the piston rod of the cylinder-piston unit 16 so the skeleton is pushed over the stationary square tube 18 to the front. The square tube 18 is therefore performed with little play in the opening 14. But there are no special forces between this square tube 18 and the opening 14, because the grate plate is mounted separately on its rear bottom on rollers on the grate base.

The FIG. 3 shows the separately prepared as a mounting module liquid-cooled heat sink K of the grate plate. The heat sink K is thus a separate construction and, if possible, consists of standard components. For example, sections of long square tubes 20-22 may be used, which are welded together by cross-connections of short welded square tube sections 23-26 to a heat sink, so that a moderating cooling flow is generated. The cooling pipe section 27 at the front of the grate plate is chamfered and requires its own welding construction. However, this heatsink construction has only a fraction of weld seam lengths compared to a conventional water-cooled grate plate with inner, welded labyrinth channel. Above all, can be dispensed with the many openings for the passage of primary air through the heat sink, because the heat sink in this present construction has parallel to each other through recesses 28-30, which extend a total of virtually its entire length. Down on its rear in the middle region of the flow and the return pipe 43, 44 are installed. From the flow pipe 43 from the Kühlfüssigkeit flows as indicated by the arrows through the interior of this heat sink and finally on the return pipe 44 from the same out.

As in FIG. 4 As shown, this heat sink K is simply placed in the framework of the support and drive structure into which it fits carefully without the need for it to be attached in any way. It rests on the ribs 3-6 and its middle part on the non-visible here center plate 9. The flow and return pipe 43, 44 of the heat sink K protrudes downwards out of the framework of the support structure, and to this the cooling hoses can be connected. The heat sink K is flowed through during operation of a liquid. In most cases, it will be mere water, but oils or an oil mixed with specific components can also be used as the cooling fluid. As already too FIG. 3 shown, the cooling liquid causes to some extent over the entire surface of the grate plate and thus dissipates heat from the surface. In order to give an order of magnitude, which however can vary depending on the construction and conditions, and on which the construction is not to be afflicted: For example, about 7m ^{3 of} cooling liquid are sent per hour through such a grate plate and their temperature increases in operation between Vor and return only about 2 ° C. This minimal rise in temperature makes it clear that it is irrelevant that at first one side half of the heat sink K is flowed through, and only afterwards the other. It is important, however, that the heat sink has recesses 28-30, which serve for the passage of primary air from below through the grate plate. This can be dispensed with the welding of a plurality of performing pipe sections for the implementation of primary air through the interior of the heat sink. On this heatsink, a heat-conducting foil 31 is then applied over the entire area, wherein this has cut-outs, which come to lie over the recesses 28-30. In the drawing, a section of this heat-conducting foil 31 is shown, although the heat-conducting foil naturally covers the entire heat sink surface. The heat conducting foil consists for example of a soft metal, such as copper or aluminum, or of an alloy of several soft metals. As an alternative or addition to such a heat-conducting foil, a thermal compound can be used. Such heat pastes are used for example for the thermal connection and cooling of semiconductors in the electronics industry, but they are also suitable for the purposes pursued here, because they can be used up to 1300 ° C.

The FIG. 5 shows the support and drive construction with the inserted therein heat sink and clamped thereon under entrapment of this heat conduction film or a thermally conductive, that is bolted, riveted or medium wedges and wedges clamped wear plates 32, 33th Namely, to give such a grate plate construction the required wear resistance, The surface must be much harder than an ordinary structural steel that can be used for the construction of the skeleton. The solution is now that the top of the grate plate where it comes into contact with the kiln, with at least one separate Verschleissplatte 32 and the front chamfer with a front wear plate 33 is equipped, but advantageously with a number of such Verschleissplatten 32, 33. The then simpler to assemble and also to replace. As material for these Verschleissplatten 32, 33 is any material in question, which is sufficiently hard and mechanically resistant and can be preserved by cooling through the underlying heat sink at a temperature which does not jeopardize its hardness. In particular, for example, Hardox steel is suitable as a building material for the Verschleissplatten 32, 33. These wear plates 32, 33 are - and this is very crucial - brought into the best possible thermal contact with the flow-through heat sink. The Verschleissplatten 32, 33 of, for example, 5 to 10 mm thickness are placed on the flow-through heat sink K and screwed with the same positive and non-positive, riveted, jammed or glued. Corresponding holes are provided in the wear plates 32, 33, so that the screw heads 34 are then flush with the surface of the wear plate. To ensure good heat conduction from the closure plates 32, 33 to the liquid-cooled heat sink K, a suitable heat-conducting material is inserted between the wear plates 32, 33 and the liquid-cooled heat sink K and clamped therebetween. This material is intended to compensate for all unevenness and lead to a rich and intimate mechanical connection and heat connection of the wear plates 32, 33 with the heat sink. As such excellent heat-conducting material proves, for example, a so-called high heat conductive soft silicone film, which covers the heat sink top as well as their front oblique front page, as in FIG. 4 shown. Such soft silicone films are soft, by the filling with thermally conductive ceramics highly heat conductive silicone films of extraordinary elasticity. They prove to be particularly suitable to dissipate heat due to different tolerances and bumps of two connectors over a longer distance to a housing or a heat sink. Here are all the benefits of silicone as a base material to bear, namely the high temperature resistance, chemical resistance and high dielectric strength, although this latter property is not in the foreground in the present application.

Due to the high compressibility of the soft silicone film, heat sources and heat sinks with large unevenness and tolerances are thermally optimally connected to each other. Due to the very good conformability of the silicone material, the contact surfaces are increased and the thermal connection is significantly improved. The applied pressure is low, and the very high elasticity provides additional mechanical damping. Because of their thermal properties, such soft silicone films have hitherto been used as ideal thermal solutions for use in electronic components on SMD printed circuit boards. Such soft silicone films can greatly reduce the overall thermal transfer resistance between two materials. Soft silicone films of this kind are available, for example, from Kunze Folien GmbH, Raiffeisenallee 12a, D-82041 Oberhaching ( www.heatmanagement.com ), where they are listed as highly heat-conductive soft silicone films KU-TDFD. They are available in different thicknesses: 0.5 mm, 1 mm, 2 mm and 3 mm. The thermal conductivity of this film material is 2.5 W / mK and the films can be used in a temperature range of -60 ° C to + 180 ° C. Therefore, an insert between the wear plates 32, 13 and the heat sink K of the grate plates of a refuse incineration grate is possible because the water-cooled grate plates always remain at a temperature of less than 70 ° C.

It is important for the use of hard wear plates 32, 33 that their thermal capacity is not exceeded. The high-temperature resistant steels for the production of wear plates retain their hardness up to approx. 400 ° C. By means of cooling by the liquid-cooled heat sink, it is achieved that the operating temperature of the wear plates is usually around 50 ° C. But this is a sufficient heat transfer from the Verschleissplatten 32, 33 on the Ensure heat sink K. This is made possible by the clamping of a soft silicone film as described. The soft silicone film 31 is placed precisely and congruent on the heat sink and the Verschleissplatten 32, 33 are placed on it. They are provided with slots 45, which then come to lie over the recesses 28-30 in the heat sink K, so that through the support frame and these recesses 28-30, the primary air can flow from below through these slots 45 upwards. The Verschleissplatten 32, 33 are on the one hand those who just rest on the heat sink, clamping the intermediate Wärmeleitfolie, and are braced with screw to the underside of the skeleton, and on the other hand, those rest on the front of the oblique front side of the heat sink and also with pinching the underlying soft silicone film with the grate plate skeleton are tightened by screw. Thus, the whole, the Brenngut facing upper and front side of the grate plate from wear plates 32, 33, and these are preferably made of Hardox steel.

The Verschleissplatten 32, 33 are clamped to the support structure, ie the grate plate skeleton. For the clamping are about screw. The screws are guided through the recesses 28-30 in the heat sink K. The Verschleissplatten 32, 33 are then clamped with clamping of the soft silicone film 31, which indeed has corresponding cutouts, with the heat sink by a lock nut is tightened on the underside of the grate plate Gerippes. This ensures optimal heat transfer. Experiments showed that the heat transfer through the use of a soft silicone film is up to five times better so without inserting such a soft silicone film. The fastening of the wear plates 32, 33 can also be effected by means of rivets as an alternative to screw connections, or, for example, bolts with countersunk heads are used, which have a transverse slot in the region of their end. It only needs then a wedge by means of a hammer laterally driven into this slot. The loosening can then simply by a hammer blow on the opposite side of the Keils done, which is even faster than a large lock nut to solve.

Instead of silicone films or soft silicone films and heat conducting foils made of a soft metal or soft metal alloys can be used. Copper or aluminum are examples of such soft metals and they are also very good thermal conductivity. Such a heat conducting film is suitable in a similar manner for clamping between the Verschleissplatten 32, 33 and the underlying heat sink and clings to it due to its softness to the surface structure of the wear plates and the heat sink. All of the above applies equally to the provision of the side planks of a water-cooled grate. These side plates have hitherto also been made of water-cooled hollow bodies.

In FIG. 6 an alternative support and drive construction without transverse ribs is shown inside. It also has side walls 1, 2, which are welded together by a sloping front wall 48, a vertical center wall 45 and a likewise vertical rear wall 7 to form a skeleton. In the front wall 48 holes 49 are provided, which serve for fastening of the heat sink and the Verschleissplatten. On the one hand, a recess 14 for the drive unit 15 is provided from the rear. The FIG. 7 shows the belonging to this skeleton heat sink K, which has a special feature breakthroughs 46 in the front 47 through which screws are plugged, so that the front wear plates on this front surface 47 of the heat sink K can be fastened. The FIG. 8 shows the carrier and drive construction FIG. 6 with the inserted therein heat sink after FIG. 7 , The heat sink K can be inserted accurately into the frame. Afterwards, the heat-conducting foil is placed on top of the heat sink. The recesses 28, 29 formed by the heat sink remain uncovered. The FIG. 9 shows this support and drive construction with inserted therein heat sink and clamped under clamping of the heat conduction foil wear plates 32, 33, which with screws 34, which down through the skeleton lead, are clamped with the underside. In FIG. 10 this carrier and drive construction is shown in a view from below, with inserted therein heat sink and clamped thereon under clamping of the heat conducting wear plates. It can be seen here, the drive unit 15, in which a hydraulic piston-cylinder unit is housed, from which one recognizes the end-side fixed tab 50, and the opposite tab 17 at the front end of the extendable piston. In addition, one recognizes the flow 43 and return pipe 44 and the screws 34, by means of which the Verschleissplatten are attached to the front.

The FIG. 11 shows a cross-sectional view across a liquid-cooled grate with two grate R (= right) and L (= left) from such grate plates P with in-lying separate heat sink .. The two grate R and L are separated by a central plank 37, which for both the grate R as well as for the grate L forms a Schurplanke. At the outer edges of the grate side planks 35, 36 are present. The grate plates P every second grate stage are designed to be movable and slide perpendicular to the drawing sheet plane along the central plank 37 and the side planks 35, 36 back and forth. Thus, these side planks 35, 36 and also the central plank 37 are subject to wear. Through the use of wear plates on the surface, these wear plates are also clamped by clamping a soft heat-conducting foil with the planks 35-37, it is possible to elegantly solve the wear problem without significantly impairing the desired heat dissipation. To revise such equipped with Verschleissplatten grate only need to be replaced, which is faster and cheaper, so replace the entire grate plates and planks. Thus, the liquid-cooled grate is everywhere, where it comes into contact with firing material, and also everywhere, where it is subject to wear due to sliding friction, equipped with replaceable wear plates. At the same time, however, the cooling effect due to the liquid cooling is hardly affected, so that all their benefits still come to fruition.

The FIG. 12 shows the central guide plank 37 FIG. 6 in an enlarged view. The wear plates 39 are here made of two parts, which are joined together at the top 38 in the middle. From both sides they are secured with countersunk screws 40 to the plank 37, wherein they pinch an inserted heat-conducting foil 31 below. In the lower area are cooled by the heat sink K and on its upper side also equipped with Verschleissplatten 32 grate plates P on the Verschleissplatten 39 to the central plank 37 at.

The FIG. 13 shows the one side guide rail 35 FIG. 6 in an enlarged view. The wear plate 41 is pulled here in one piece around the plank 35. Below it clamps a Wärmeleitfolie 31 and it is screwed here with two countersunk screws 42 with the plank 35. In the lower region of the wear plate 41, the grate plates P cooled by the heat sink K and also equipped with wear plates 32 on their upper side abut against the wear plate 41.

The advantage of this grate construction with a carrier and drive construction, a separate heat sink K inserted therein with recesses 28-30 and including a soft heat-conducting foil 31 thereon wear plates 32, 33 are the following: For maintenance, the individual grate plates P or Roststufen no longer be removed and replaced, but you just replaced the Verschleissplatten 32, 33; 39, 41 on the grate plates P and those on the laterally limiting planks 35, 37, so always remain in the system. The grate plates P and planks of iron with their operating temperature of 50 ° C to 70 ° C and without mechanical wear many years, even decades. If only one wear plate 32, 33 has to be replaced on a grate plate, this costs a fraction of a whole conventional hollow grate plate. In addition, the replacement of a wear plate 32, 33; 39, 41 much faster than replacing a whole grate plate and the associated one Works are foolproof. Otherwise, if an entire grate plate has to be replaced, the cooling circuit must be interrupted and the plates must be emptied of the cooling liquid. Then the individual grate plates can be lifted out of the grate in a relatively expensive way by means of a lifting device. The replacement panels must be redone in a relatively complex manufacturing process. On the other hand, one only needs wearing plates 32, 33; 39, 41, so the liquid-cooled rust does not even need to be emptied. Only the nuts on the grate plate underside need to be loosened and afterwards the wear plates 32, 33 can be lifted off the grate and replaced. New countersunk screws are used and the new wear plates are in turn clamped to the grate plates. The same applies to the lateral liquid-cooled planks 35, 37 of the grate. The replacement of the closure plates 32, 33; 39, 41 is therefore much faster than the replacement of whole grate steps, and the preparation of new liquid-cooled grate plates as practiced previously eliminated altogether. In addition, the heat distribution is greatly improved thanks to the inserted Wärmeleitfolie. The heat is therefore uniformly dissipated everywhere from the grate surface, that is, from the Verschleissplatten, and these are largely the same hot over their entire surface. In comparison to conventional grate plates in the form of liquid-flow hollow body constructions, the number and arrangement of the air slots can remain identical in these grate plates with inserted heat sink and wear plates clamped thereon. You just have to lie over the recesses in the heat sink. Likewise, the positioning of the supply and return nozzles for the coolant can remain the same. The cooling cross sections, the weight and the shape of the grate plates as well as the attachment points for the drive can remain unchanged. The grate plates are therefore readily suitable for retrofitting existing grate webs. The advantages of this design presented here are therefore very obvious.

Previous test results give the following picture: The top of previous grate plates is after 35,000 to 45,000 operating hours except for a wall thickness consumed by about 4 mm. The whole grate plate is therefore scrap and must be replaced. In contrast, only have the wear plates are replaced with a present grate plate after this period of operation. The carrier and drive construction can remain left untreated in the grate. The cost of replacing the wear plates make up only a fraction of the previous cost for the full replacement of the grate plates. These grate plates therefore promise a much longer service life with the same weight. The surface temperature is only increased by 15 ° C compared to the conventional construction without wear plates. Operational safety is increased with these new grate plates, because the heat sinks are not damaged by extreme thermal influences. There are no potential leaks because there are no more welded through pipes for the primary air supply. These new grate plates can be made dimensionally compatible with conventional grate plates and therefore even replace the latter if necessary even individually.

Claims (5)

1. Liquid-cooled grill plate, having a carrier and drive design for this grill plate and a separate cooling body that can be placed into said carrier and drive design and permeated by the liquid and having wear plates mounted onto said cooling body (K), whereby:

   • The carrier design is a carcass made of planar steel parts that are welded together and the drive unit (15) encloses a hydraulic cylinder piston unit (16) which is accommodated on the inside of a square tube (18), said tube being guided displaceably in a tunnel like breakthrough (14) on said ribbed configuration while the piston end is connected to the carcass by a pin,

   • the cooling body (K) is a welded design formed by square tube sections (22-26) and profile sections (27), so that the cooling body (K) realizes a plane upper side and at least a continuous recess (28-30) extending across the entire longitudinal extension of the cooling body (K), in that

   • the wear plates (32) are realized as Hardox planar plates which are equipped with primary air slots (45) and mounted on the cooling body (K) congruent with said body (K) while clamping a highly thermally conductive foil made of soft metal comprising one or more soft metals and resting congruently on the cooling body (K), or while clamping a highly thermally conductive foil predominantly comprising silicone and being a soft silicone foil which is resting congruently on the cooling body (K) in order to create a heat contact, and in that the wear plates can be screwed onto the carrier design,

   • wherein the primary air slots (45) come to rest over the recesses (28-30) in the cooling body (K).
2. A liquid cooled grill plate according to one of the preceding claims, characterized in that the said grill plate presents on its upper side as well as on its inclined front side a plurality of wear plates (32-33) made of Hardox steel and disposed next to each other.
3. A liquid cooled grill plate according to one of the preceding claims, characterized in that the wear plates (32, 33) are mounted on the liquid cooled cooling body (K) while guiding screws (34) downward from the bottom side of the wear plates (32, 33) through the recesses (28-30) in the cooling body and are mounted there with respect to the carcass of the carrier design by way of lock nuts.
4. A liquid cooled step grill comprising one or more grill plates disposed next to each other, according to one of the claims 1 to 3, wherein these grill plates overlap from one step to the next and every second step is designed to be movable and wherein if a plurality of grill plates per step are present, the carrier designs of adjoining grill plates disposed next to each other are screwed together.
5. A liquid cooled step grill according to claim 4, whereby thereof which is to say the surfaces of the grill plates and the side planks (35, 36) and in the case of a plurality of grill webs disposed next to each other also the center planks (37) are equipped with wear plates (39, 41) in that the same are connected to the grill plates (P) or the center plank (37) and side planks (35, 36) by screw connections (40, 42) or rivets.

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