Method of floatingly supporting a metallic strip
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United States of America Patent
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-
Jun 2, 1992
Grant Date -
N/A
app pub date -
Nov 9, 1990
filing date -
Sep 1, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Disclosed is a method of floatingly supporting a metallic strip in a direct firing type continuous heat treating furnace accommodating a plurality of floater nozzles. In this method, furnace gas is initially supplied to and pressurized by a plurality of multistage booster fans. The temperature of the furnace gas to be supplied to the booster fans is less than a critical temperature of the fans. When the temperature of the furnace gas is less than the temperature of the material of the strip, the temperature of the furnace gas is raised to a temperature near the material temperature in combustion chambers provided with respective direct firing type burners. The furnace gas is then supplied to the floater nozzles, the internal pressure of which is controlled prior to being jetted.
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