EP2284469A1 - Rust plate with insert - Google Patents

Abstract

The plate has a plate body with a frame, and a support plate (3) arranged on the frame. Slots (31) are provided in the support plate for air passage openings. The slots comprise width that is larger than predetermined width (34). Gas supply inserts (4) are provided with a middle piece and a guiding piece. The gas supply inserts with the middle piece are inserted through the slots and are variably positioned with the guiding piece for different constriction of the slots. The inserts are projected at an upper side and a lower side of the support plate.

Description

The invention relates to a grate plate for coolers of schuttfähigem Good with a trained for receiving a Gutbetts plate surface and a plurality in this surface opening air passage openings with a predetermined width.

It is known to assemble the grate of a cooler for pourable fired material, in particular clinker, from a plurality of grate plates. On the surface of the grate plate is the good bed to be cooled, wherein the air required for cooling is blown through a plurality of air passage openings in this surface. The grate plates are exposed with their surface high loads, namely because of the at least initially or intermittently occurring high temperature of the material to be cooled and by abrasion, especially in sharp-edged Good as clinker. This large load leads to considerable wear of the grate plates. In order to make them sufficiently robust and rationally producible, they are often made of cast material. A difficulty here is that only relatively simple shapes with large tolerances for the geometry of the air passage openings in the casting process can be produced. This creates the problem that relatively much good material through the air outlet openings falls down (rust diarrhea).

To reduce the Rostdurchfalls it is also known to provide built grate plates, in which separate inserts are provided for arrangement in the air outlet openings ( WO 94/08187 A1 ). The inserts have an L-shaped profile. They are arranged in the air outlet openings that close flush with their top surface with the plate surface and on their underside, they form with their downwardly projecting horizontal part of the L-shaped profile, a deflection, whereby the unwanted Rostdurchfall is reduced. The effective width of the air outlet openings remaining therefrom is reduced by the insert, and the relatively large tolerances which inevitably occur during casting assume a dominating influence with respect to the total width of the slots. Without mechanical post-processing, for example by milling to a defined level, this results in large differences and thus a greatly differing flow of cooling air over the grate.

The invention has for its object to provide an improved grate plate, in which this disadvantage is reduced.

The solution according to the invention lies in a grate plate with the features of the independent claim. Advantageous developments are the subject of the dependent claims.

In a grate plate for coolers of schuttfähigem Good, in particular clinker, with a formed for receiving a Gutbetts plate surface and a plurality in this surface opening air passage openings with a predetermined width, comprising a plate body with a frame and a top of the frame arranged support plate, and slots in the support plate for the air passage openings, the invention provides that the slots have an overreach that is greater than the predetermined width, and that a set of gas guide inserts is provided, the gas guide inserts are inserted with its center through the slots and are variably positionable with their guide piece for different constriction of the slots.

The invention is based on the idea of providing a decoupling of the previously calculated (predetermined), effectively effective, from the actual width of the slots in the support plate. This is a two-part construction, the slots are made in the support plate from the outset with a too large width (distance). The reduction to the desired predetermined width to ensure a certain cooling air flow rate is then carried out by appropriately arranging a gas guide insert. The center-piece and angled-guide embodiment allows the gas-guiding inserts to be located at different positions in the slot, resulting in a different effective width of the slot, depending on the position. Thus, even with large tolerance deviations of the slot width (as they may arise in particular during casting) without further reworking the desired predetermined width can be achieved, even in the production technology difficult to control heavily inclined slots.

The invention thus makes it possible to produce the actual plate body with narrow and / or sharply inclined slots, whereby previous casting technical problems and limitations can be avoided or overcome. Thanks to the provision of the set of gas guide inserts of different thickness can with the same body through Selection of suitable inserts the effectively effective predetermined width can be easily adjusted. This can be made without changing the base body grate plates with low, medium or high air flow. The compensation of manufacturing tolerances in the width of the slot, which can be considerable, especially in casting plates produced by casting, can be easily done by a suitably positioned gas guide insert, so that there is a homogeneous cooling air distribution over the grate plates and over the entire grate. This allows a higher quality cooling operation. Furthermore, the separate design of the gas guide inserts makes it possible to selectively exchange them, if necessary, in particular if they are worn out and thus lead to increased rust diarrhea. The separate replacement of the gas guide inserts is considerably more efficient than replacing an entire grate plate. Further, the embodiment with separate gas guide inserts allows to provide those with different shapes and types of profiles. The selection of a particular profile can then be coordinated with the use of the grate plate in the cooler. This results in much greater design possibilities with respect to the design of the cooling air ducts in the grate plate than conventional grate plates produced by casting, and this without significant additional effort.

In essence, the invention is based on the finding that slots are created by the casting technology production of the grate plate with oversize, where it does not depend on the tolerance, because the final measure is produced by a targeted reduction by means of gas guide inserts, depending on their arrangement and / or strength narrow the slot to the desired free width. At first glance, this may seem more complex, but allows the rational production of the body in the casting process, and yet the achievement of good values for homogeneity of the cooling air distribution and low rust diarrhea.

Preferably, three different types of gas guide inserts are provided for this purpose, each of which realizes the invention. In the first embodiment, uniform gas guide inserts are provided, which are positioned differently in the slots of the grate plate and thus - as described above - determine their effective width. In a second embodiment, the gas guide inserts of the set are made with different thickness. This simplifies assembly, since the narrowing of the slot to the desired effective width is carried out by the respective strength. In a third embodiment spacers are provided for the gas guide inserts, which determine a distance of the gas guide insert from an edge of the slot. This can also be defined narrows the air passage opening. The spacers thus make it possible to use one and the same gas guide insert in different ways and thus to produce air passage openings of different widths. The number of parts of gas guide inserts of different thickness is thereby reduced.

The gas guide inserts preferably protrude from the support plate both at the top and at the bottom. The downwardly projecting part is preferably designed as a channel-shaped, in order to absorb rust diarrhea. In this case, have the upwardly projecting part or down projecting part of such a shape and extension, which allow passage through the slot in the support plate. This makes it possible to insert the gas guide inserts through the slot, which greatly simplifies the replacement of already mounted grate plates.

The plate body is preferably made in one piece, as a casting. The slots advantageously have an angle of at most 45 degrees, preferably between 25 and 35 degrees, to the surface of the grate plate. This, together with the narrow-tolerance effective width, thanks to the gas guiding inserts, creates a geometry that minimizes rust dross and yet can be produced efficiently. Slits with a high inclination have traditionally been difficult to produce with sufficient accuracy, so that only the invention allows the combination of high inclination and narrow tolerances narrow slit.

Figur 1

eine Schnittansicht einer Rostplatte gemäß einem ersten Ausführungsbeispiel der Erfin- dung;

Figur 2

eine Aufsicht auf die Rostplatte gemäß Figur 1;

Figur 3

eine Aufsicht auf eine Rostplatte gemäß ei- nem zweiten Ausführungsbeispiel; und

Figur 4

eine vergrößerte Detailansicht im Schnitt der Rostplatte gemäß Figur 1;

Figur 5 a-d

Schnittdarstellungen zur Montage von Gasfüh- rungseinsätzen;

Figur 6a, 6b

Darstellungen zweier alternativer Sätze von Gasdurchführungseinsätzen.

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

FIG. 1

a sectional view of a grate plate according to a first embodiment of the invention;

FIG. 2

a view of the grate plate according to FIG. 1 ;

FIG. 3

a plan view of a grate plate according to a second embodiment; and

FIG. 4

an enlarged detail view in section of the grate plate according to FIG. 1 ;

FIG. 5 ad

Sectional views for mounting gas supply inserts;

Figure 6a, 6b

Representations of Two Alternative Sets of Gas Feedthrough Operations.

The general structure of an embodiment of a grate plate according to the invention is from the Figures 1 and 2 seen. The designated in its entirety by the reference numeral 1 grate plate comprises a grate plate frame 2 and a support plate arranged thereon 3. The frame 2 is of box-like shape and has a bottom 21, which at a front end in the grate plate 1 with a large opening 22 to Supply of cooling air is provided. At the top, the grate plate 1 is closed by the support plate 3, so that a total of a cavity 20 is bounded. In this cavity 20 cooling air is supplied via the opening 22 and introduced via subsequently explained in more detail slots in the support plate 3 in the resting on the support plate 3 refrigerated goods 9.

The frame 2 and the support plate 3 are preferably made of a cast material, for example of heat-resistant cast steel (eg 1.4825GX25CrNiSi18-9 according to EN 10295). It can be made in several parts, in particular in two parts; but it should not be ruled out that the frame 2 and the support plate 3 are made in one piece.

In FIG. 2 is a plan view of such a grate plate 1 is shown. It should be noted that a rust is formed from a variety of grate plates, which are arranged next to and behind one another like a matrix. For this purpose, grate plate carriers (not shown) are provided, on which the individual grate plates 1 are arranged transversely or longitudinally to a working direction of a cooler. Preferably, the grate plates according to the invention in a grate cooler, mainly in a grate cooler, installed, for cooling of highly schleißendem Good (such as cement clinker). However, it should not be ruled out that the grate plate according to the invention can also be installed in other similar grates in which overhead pourable material a working or treatment gas is supplied through the grate plate, for example, a grate upstream inlet module, to which raised the material to be cooled and from which it slips on the rust.

In FIG. 4 an area of the support plate 3 is shown in an enlarged sectional view, through which in the cavity 20 of the grate plate 1 supplied cooling gas is discharged upwards into the overlying layer of bulk material. The support plate 3 is provided with a plurality of transverse to the longitudinal direction slots 31. These slots 31 are, in particular, those which can be produced during the casting of the support plate 3 or the entire grate plate 1. In order to achieve a certain cooling air flow rate, for which the grate plate is designed, a gas passage opening with a predetermined width is required; this expanse is in FIG. 5a represented by a dashed line 34 and the cooling air flow by an arrow 33. The width of the slots 31 is dimensioned so that it is significantly larger than would be required for the removal of the amount of cooling gas from the cavity 20 in the resting good (overreaching). The slots 31 thus have a relatively large width, due to the production in the casting process, the width is not constant, but is subject to considerable fluctuations (rough tolerance). In the illustrated embodiment, the angle α of the slots 31 to the surface 30 is shown exaggerated for illustrative purposes. Proven to have an angle of 30 degrees.

The slots 31 may extend over the entire width of the grate plate 1 or only over a part. The latter is in an embodiment 1 with offset slots 31 in FIG Fig. 3 shown. The inventively provided gas guide inserts 4 are equally suitable for both embodiments.

The gas feed-through insert 4 has several areas. It comprises a center piece 41, which is substantially straight and dimensioned so that it extends from the underside of the support plate 3 to the top 30 thereof. At the lower end of the middle piece 41, a groove 42 is arranged, which projects into the cavity 20 below the support plate 3. The groove 42 is concave on its inner side, so that it forms a counterpart to an optional convexity 32. At the upper end of the middle piece 41, a guide piece 43 projecting beyond the surface 30 is arranged. It abuts with its free end to the surface 30 and is fixed there by welding. The individual steps for mounting and positioning the gas guide insert 4 are in Fig. 5 a) - d) shown. The position in which the gas guide insert 4 is finally welded into the slot 31 (positioned) determines the effective effective width 34 of the slot 31. Thus, also roughly different slot widths, as they usually arise in particular during manufacture in the casting process, can be compensated easily and with high accuracy.

At the in Fig. 4 illustrated embodiment, the various effective widths are achieved by different positioning in itself uniform gas guide inserts 4. According to an alternative embodiment, sets of gas feed through inserts 4 of different thickness may also be provided (see FIG. 6a, b ). The gas feed-through inserts 4 ', 4 "of a set differ in their different thickness with which they effectively reduce the effective air passage width after insertion into an air passage opening 31. The gas feed through inserts 4' can be solid ( Fig. 6a ) or they can be 4 "in skeleton construction ( Fig. 6b ). In the gas guide inserts 4 "in a profile 45 is arranged on a center piece 41 of the gas feedthrough insert 4". It is adapted, together with another component of the gas feedthrough insert 4 "(this may be another - not shown - profile or the guide piece 43) to determine the position of the gas feedthrough insert 4" in the slot 31 and thus effectively effective Strength (compared to the massive version 4 ', as in FIG. 6a shown). The assembly is simplified in these gas guide inserts 4 ', 4 ", since they only need to be applied and fixed flush to the side wall of the slot 31.

The gas feed through inserts 4 are preferably made in one piece. In many cases, this means that both the middle piece 41 as well as the channel 42 and the guide piece 43 have the same material thickness (s. Fig. 6a ). But this is not necessary. Rather, it may also be expedient that in the sentence only the material thickness in the region of the middle piece 41 differs, and the groove 42 and in particular the guide piece 43 always have the same material thickness (s. Fig. 6b ). The latter offers the advantage of uniform flow conditions for the cooling air flowing through the effective width slot 34.

Claims (9)

Grate plate for coolers of refractory having a plate surface (30) formed to receive a gut bed and a plurality of air passage openings opening into said surface of a predetermined width, comprising a plate body having a frame (2) and a support plate (3) arranged on top of the frame and slots (31) in the support plate for the air passage openings,
characterized in that
the slots (31) have an overwidth greater than the predetermined width (34) and that
Gas guide inserts (4) with a central piece (41) and a guide piece (43) are provided, which are inserted through the slots (31) with its center piece (41) and with its guide piece (43) are variably positionable for different narrowing of the slot ( 31). Grate plate according to claim 1, characterized in that spacers (45) for the gas guide inserts (4) are provided which determine a distance of the gas guide insert (4) from an edge of the slot (31). Grate plate according to claim 1, characterized in that the gas guide inserts (4 ') have different thicknesses. Grate plate according to claim 1 or 2, characterized in that the gas guide inserts (4 ") are executed in skeleton construction with a projection (45). Grate plate according to one of the preceding claims, characterized in that the gas guide inserts (4) protrude both at the top and at the bottom of the support plate (3). Grate plate according to claim 5, characterized in that the gas guide inserts (4) are asymmetrical with respect to their projecting beyond the support plate and down from the support plate areas. Grate plate according to one of claims 4, 5 or 6, characterized in that the part projecting downwards forms a preferably groove-shaped overlap (42). Grate plate according to one of the preceding claims, characterized in that the gas guide inserts (4) have at most such dimensions as are sufficient for passage through the slot (31) in the support plate (3). Grate plate according to one of the preceding claims, characterized in that the slots (31) form an angle α of at most 45 degrees, preferably between 25 and 35 degrees, to the surface (30) of the grate plate.

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