AUTOMATIC METAL PROTECTING APPARATUS AND METHOD

专利名称：AUTOMATIC METAL PROTECTING

APPARATUS AND METHOD

发明人：GILDERSLEEVE W,US申请号：US41022073申请日：19731026公开号：US38278A公开日：19740806

摘要：When a metal strip passing through a furnace is overheated, the furnace isautomatically shut down in a special way to prevent outside air from rushing in to causestrip oxidation in critical furnace areas. The fuel-air mixture in the furnace is graduallyreduced to a low rate which is substantially above zero, and then continues at that lowrate for a definite period of time. Also, a non-oxidizing gas such as nitrogen is graduallyintroduced into the furnace at a gradually increasing rate, reaching its full flow after adefinite period of time, while maintaining positive pressure in the furnace chamber. Thenitrogen flows for a definite period of time at full volume, and then the gas-air fuelmixture is cut off, still maintaining positive pressure in the furnace chamber. This avoidsleakage of air into the furnace; further, exhaust stack dampers, which are initially open, asrequired automatically to maintain positive furnace pressure, are gradually and

automatically brought to a closed position to assist in preventing outside air from beingdrawn into the furnace chamber.

申请人：GILDERSLEEVE W,US

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