Furnaces – With control means responsive to a sensed condition – Feed control
Reexamination Certificate
1998-03-27
2001-05-15
Lazarus, Ira S. (Department: 3743)
Furnaces
With control means responsive to a sensed condition
Feed control
C110S16500A, C110S259000, C122S00400R, C165S104160, C165S104180, C165S286000, C414S161000, C414S216000
Reexamination Certificate
active
06230633
ABSTRACT:
The present invention relates to a conveyor/cooler of loose solid materials with small particle size, such as bottom ash produced by fluid bed boilers or casting sand, sintered power, cement clinker, slag or small particle size minerals produced during various industrial processes of burning, cooking, sintering etc. While the present invention is applicable to treating various hot solid loose material, such as the above listed, a preferred use thereof is to treat ash produced in fluid bed boilers which will be referred to in the following as an exemplary and not limiting embodiment.
In fluid bed burners, the more used system for extraction and cooling of ashes (which exit from the combustion chamber at temperatures around 800-900° C.) is constituted by a water cooled scroll (the water cools both the external shell and the scroll). But such a system has the following drawbacks:
high wear because of the erosion action exerted by the ash (which has a high content of silica and other abrasive materials) on the metallic parts both of the scroll screw and the shell;
danger, because of the fast wear of the shell, of creation of slits which, causing the water to contact high temperature ashes, could cause a danger of explosions because of the fast evaporation of water;
possibility of sudden stops of the scroll in case there are hard materials having sizes higher than the distance between the scroll screw and the enclosing shell; and
dispersion into the environment of the whole heat content which cannot be recovered.
In addition to the above, there exists the problem of a high consumption of water for carrying out cooling. Water currently has a very high value and must be safeguarded from any kind of pollution.
The above mentioned problems and shortcomings are overcome by the conveyor/cooler according to the present invention. Further advantageous features of the invention are also set forth in this disclosure.
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Carrea Alberto
Magaldi Mario
Ciric Ljiljana V.
Foley & Lardner
Lazarus Ira S.
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