F - Mech Eng,Light,Heat,Weapons – 27 – D
Patent
F - Mech Eng,Light,Heat,Weapons
27
D
126/14, 22/150,
F27D 13/00 (2006.01) F27D 17/00 (2006.01)
Patent
CA 1070199
ABSTRACT A metal preheating apparatus has a box-like structure including, a bottom, a top wall, a pair of sidewalls, and a pair of end walls forming an enclosed receptacle. Fluid channels are defined between the outer surfaces of a pair of inner walls spaced inwardly from the sidewalls and the inner surfaces of the sidewalls. The upper and lower edges of the inner walls terminate short of the top wall and short of the bottom to place the upper portion of the receptacle in fluid communication through the fluid channel with the lower portion of the receptacle. A horizontally, oriented, load supporting grate member is positioned intermediate these apertures and extends longitudinally between the end walls and transversely between the inner walls. The bottom of the structure is open. The top wall of the structure contains an upper door for charging scrap metal into the upper portion of the receptacle so that the scrap metal is supported by the grate member. An end door is provided in one of the end walls to discharge the scrap metal from the upper portion of the receptacle. In operation, scrap metal is charged into the upper portion and the upper door is closed. The entire apparatus is then positioned over hot metal ingots that have just been removed from their molds. The heated air surrounding the ingots rises through the scrap metal. As the air passes upwardly by convection through the scrap metal, heat is transferred from the air to the scrap metal, cooling the air and heating the scrap metal. The cooled air enters the fluid channels from the upper portion of the receptacle, travels downwardly by convection through the fluid channels, and exits from the fluid channels into the lower portion of the receptacle. The air then passes by the ingots and is reheated to begin another convection cycle for preheating the scrap metal.
270287
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