Vapor-reinforced expanding volume of gas to minimize the contamination of products treated in a melting furnace
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United States of America Patent
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Feb 23, 2016
Grant Date -
Feb 20, 2014
app pub date -
Oct 28, 2013
filing date -
Aug 23, 2006
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Abstract
Systems and corresponding methods are described herein that provide an effective inert blanket over a metal surface (hot solid (charge) metal or molten metal) in a container such as an induction furnace. The system includes a container of metal and a system configured to delivery biphasic inert cryogen toward the metal. The delivery system may include a lance disposed at the top of the container. The lance has a hood that directs both a flow of liquid cryogen and a flow of vaporous gas toward the metal surface. The liquid cryogen contacts the metal surface, generating a volume of expanding gas over the metal surface. The vaporous cryogen creates a reinforcing vapor that slows the expansion rate of the expanding gas, localizing the expanding gas over the metal surface.
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