Grate plate for cooler

Details Grate plate for cooler Grate plate for cooler

2000-10-10

2001-09-18

Lu, Jiping (Department: 3749)

Heating

With work cooling structure

C432S078000, C432S080000, C126S16300A

Reexamination Certificate

active

06290493

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a grate plate for a cooler of loose material leaving a kiln and having the overall shape of an inverted tray with a bearing surface for supporting and advancing a layer of material that is to be cooled with the aid of a cooling gas passing through the said plate.
Such coolers are particularly used in cement works for cooling the clinker as it comes out of the kiln. These plates are grouped in transverse rows with an overlap between their forward parts and the rear parts of the preceding rows so as to form a tiered cooling plane. The progress of the material to be cooled is usually effected by an alternating arrangement of fixed rows and moving rows, the latter being moved back and forth in the direction of progress of the material.
Some existing plates have a smooth surface along their full length with openings for the passage of the cooling gas. Although these plates have the advantage of simplicity and a small manufacturing cost, they have the disadvantage of a short working life. It should be realized that these plates come under intense wear. There is first of all the wear by abrasion generated by the friction due to the relative movement between the plates and the material to be cooled. There is also oxidative wear due to the high temperatures of as much as 1400° C. of the material as it leaves the kiln.
In order to improve wear resistance, plates have been designed with pockets in the forward parts which do not overlap and which are therefore directly in contact with the material. As they fill up, these pockets form material/material interfaces which should reduce the abrasive wear, given that cooled material remains in these pockets and protects them from the hot moving material. One such plate is described in document EP 0 337 383 B1.
Even so, the exposed surfaces between the pockets remain comparatively large. In addition, the path of the cooling gas is labyrinthine, which causes a head loss and reduces the ability to cool both the material and the plate. The result is that in practice, plates with pockets have a working life which is hardly any longer than that of plates with a smooth surface. Document DE 41 03 866 discloses a grate plate that has a corrugated surface with openings for the passage of cooling air in the corrugations. This plate has the disadvantage that the material to be cooled slides rapidly over the corrugations, which are therefore exposed to severe abrasion. Furthermore, the plate is insufficiently cooled by the cooling air.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a new grate plate for a cooler which will provide more efficient cooling, both of the material to be cooled and of the plate itself and, as a consequence, a longer service life.
To achieve this object, the plate provided by the present invention is characterized in that the forward part of the plate, viewed in the direction of progress of the material, consists of overlapping gills sloping upwards and defining transverse cavities in the bearing surface and in that the overlapping parts of two adjacent gills define narrow channels for the passage of the cooling gas.
These channels preferably have a longitudinal section in the form of a rounded bend with an angle of less than 90° opening vertically in the underside of the bearing surface and obliquely in the bottom of each cavity.
These channels give better guidance to the cooling gases and a more direct passage with little head loss. The tangential entry of the gases into the bottom of the cavities further ensures efficient cooling of the gills, which enhances the wear resistance of the grates.
The surfaces directly exposed to wear are small and limited to the edge of the plate and to the upper ridges of the gills, the rest being protected by material remaining in the cavities where it forms material/material interfaces.
The upper forward edge of each gill is preferably in the form of a transverse vertical rib.
The plane of the part consisting of gills may slope upwards relative to the plane of the smooth rear part of the plate.


REFERENCES:
patent: 4460333 (1984-07-01), Longaretti
patent: 4600098 (1986-07-01), Orren
patent: 4103866-A1 (1992-08-01), None

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