Patent ID: 7232542
Filing Date: 2007-06-19
Classification: C21B,Y02P

Abstract:
1. A blast furnace system for producing molten iron comprising: a blast furnace; a hot blast main for conveying a supply of hot blast to the blast furnace; a plurality of stoves for heating a supply of cold blast and generating the hot blast; a cold blast main for conveying a supply of cold blast to the plurality of stoves; at least one cold blast preheater, provided between the cold blast main and the hot blast main for heating a portion of the cold blast that has been diverted to the preheater before reaching the stoves into heated air output, said preheater comprising a combustion chamber in which a continuous supply of combustion air and fuel are combusted generating hot combustion gases; and a temperature control unit operatively configured to monitor the temperature of the preheater's heated air output and adjust the supply of combustion air and fuel to the preheater to maintain the temperature of the heated air output at a desired level for tempering the hot blast, wherein the heated air is mixed with the hot blast to temper the hot blast temperature.