Heating – With work cooling structure
Patent
1995-04-27
1996-12-17
Kamen, Noah P.
Heating
With work cooling structure
110291, F27D 1502
Patent
active
055846866
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a flexible connection for supplying cooling air to a movable grate cooler. The cooler comprises alternate rows of movable stationary grate elements designed for cooling granular material that has been subjected to heat treatment in a kiln, for example a rotary kiln.
When used in connection with a rotary kiln, the grate cooler is mounted at the outlet end of the kiln and is adapted to receive the hot material discharged from the kiln. The material is distributed across the grate surface of the grate cooler and is conveyed in a bed across the grate surface. The material is thereby conveyed through the cooler by the reciprocating movement of the movable grate elements, while the material bed is simultaneously swept by cooling air from the perforated surface of the grate elements.
Grate elements such as described herein are known, for example, from Danish patent application No. 1227/92. Since, generally, the material bed on the grate surface is not homogeneously sized, the cooling air is often separately fed to each single grate element and can thus be controlled for optimum cooling. Consequently, this requires an air supply connection for each of the single grate elements, both the stationary and the movable elements.
Although it is not particularly difficult to supply air to the stationary grate elements, it is an essential requirement that the air connection for the movable grate elements has the required degree of flexibility so that the connection can follow the reciprocating movement of these grate elements.
Therefore, the flexible connection often consists of a flexible hose, such as rubber or canvas or even stainless steel formed as an elastic bellows.
However, such flexible connections are exposed to wear and degradation due to the continuous bending strains. This is further aggravated by exposure to the influence of very hot material which falls down between the grate elements.
BRIEF SUMMARY OF THE INVENTION
The present invention is directed to a flexible connection of the type described above, wherein the aforementioned disadvantages are avoided or substantially reduced. The connection comprises a rigid pipe with two end sections having a wall thickness which exceeds that of the pipe. The pipe sections are rounded on their outer sides and mounted in a displaceable and tiltable manner in separate pipe sockets. The first socket is fixed to the movable grate element while the second is fixed to the stationary frame of the cooler.
Such a flexible connection does not have any parts which are exposed to abrasive and degrading bending strains. Moreover, if at least the end sections are made of wear-resistant material, the service life of the connection can be extended, both with respect to wear resistance and increased resistance to hot falling material.
As additional protection against possible falling, hot material, the stationary pipe socket on the cooler frame may be shielded against such material by means of a collar on the pipe.
BRIEF DESCRIPTION OF THE DRAWING
The invention is described in further detail with reference to the diagrammatical drawing showing a part of a grate cooler in longitudinal section and with a flexible connection according to the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT
The drawing shows three grate elements 1, 2, 3 which in known manner overlap one another. The center element 2 can be moved to and fro as indicated by means of the double arrow 4. Through the movement of the movable grate element 2, the material 5 to be cooled is conveyed across the grate surface from the left-hand side to the right-hand side on the drawing as indicated by the arrow 6.
During conveyance, the material is swept by cooling air which is blown up through the material via perforations 7 in the surfaces of the grate elements. Under the surface of each grate element is an air chamber 8 which is fed with cooling air from the lower part of the cooler frame 9.
Although it is not particularly difficult to supply the stationary
REFERENCES:
patent: 3751220 (1973-08-01), Rossi
Patent Abstracts of Japan, vol. 3, No. 49, M-57, abstract of JP, A, 54-28015 (Kubota Tekko K.K.), 2 Mar. 1979 (02.Mar.1979).
F. L. Smidth & Co. AS
Kamen Noah P.
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