Batch melting vessel lid cooling construction
AssigneePPG Industries, Inc.
InventorsGerald E. Kunkle, George A. Pecoraro, Henry M. Demarest, Jr.
Life of this patent
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Abstract
A lid of a glass batch melting vessel is subjected to corrosive and thermal degradation. The lid is cooled and the temperature of the exploded inner surface of the lid is controlled such that particulate and molten materials entrained in exhaust gas circulating within the vessel adhere to the lid surface forming a protective, insulating coating that prolongs the service life of the lid.
Claims14
In a method of liquefying pulverulent batch material including the steps of depositing said material into an enclosed heating vessel along a sloped surface substantially encircling a cavity in said vessel, raising the temperature within said vessel with a high velocity combustion type heating means to liquefy said material wherein said heating means is positioned to direct heat along said sloped surface and exhaust gas from said heating means circulates within said vessel, and removing said exhaust gas from said heating vessel, wherein said circulating exhaust gas includes entrained particulate and molten material resulting from liquefying said batch material having corrosive properties which degrades selected exposed lid surface portions of said vessel as said exhaust gas circulates within said vessel prior to exiting said vessel, the improvement comprising:
- cooling said exposed surface to a temperature such that said entrained, circulating particulate and molten materials contacting said cooled surface adhere to said surface and form a protective layer on said surface;
- and
- controlling the cooling of said surface during said cooling step so as to adhere additional materials entrained in said circulating exhaust gas to said materials previously adhered to said surface and adjust the thickness of said layer.
In an apparatus for melting material of the type having a heating vessel with a lid, means to deposit said material along a sloped surface substantially encircling a cavity in said vessel, a high velocity combustion type heating means to direct heat along said sloped surface and melt said material wherein exhaust gas from said heating means circulates within said vessel, and means to remove said exhaust gas from said vessel wherein said circulating exhaust gas includes entrained particulate and molten materials resulting from the melting of said material having corrosive properties which degrades selected exposed surface portions of said lid as said exhaust gas circulates within said vessel prior to exiting said vessel, the improvement comprising:
- means to cool said exposed lid surface portions such that entrained circulating particulate and molten materials adhere to said surface forming a protective layer;
- and
- means to control said cooling means to adjust the thickness of said protective layer.
Dependencies are inferred from the claim text.