Apparatus for pre-heating a metal charge for a melting plant and connected method
AssigneeDanieli & C. Officine Meccaniche SpA
InventorsThomas Narholz, Bernard Villemin
Life of this patent
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Abstract
Apparatus for pre-heating and conveying a metal charge to a container of a melting plant, comprising at least a conveyor channel along which said metal charge is able to advance so as to be delivered to the container, and in which above said conveyor channel at least a hood is disposed which defines a tunnel inside which at least part of the fumes exiting from said container are able to advance. At least a zone of the hood comprises an expansion chamber located above at least a portion of said metal charge, and able to expand and keep said fumes inside it for a minimum desired time of at least 1.5 seconds before they go into contact with the metal charge.
Claims5
A method for pre-heating a metal charge to a melting furnace of a melting plant, comprising the steps of:
- a) advancing a metal charge from a conveyor to a melting furnace,
- b) advancing metal charge fumes from the melting furnace to an expansion chamber;
- c) expanding the metal charge fumes in said expansion chamber by slowing and retaining the fumes within said expansion chamber for a time period of at least 1.5 seconds before the fumes impact with the metal charge;
- d) reducing the temperature of the fumes from about 1300° C.-1400° C. at entrance into the expansion chamber to temperature of about 800° C.-1000° C. when they contact the metal charge, and
- e) reducing the speed of the fumes from a range of about 40 m/s to about from 6 m/s to about 18 m/s.
Dependencies are inferred from the claim text.