Gaseous mixing device for regenerator heaters

Claim 1

The combination characterized by an air-gaseous fuel mixing chamber for supplying an air-gaseous mixture to a combustion chamber that in turn discharges a blast of heated air at a temperature of 1,200*C and greater to a blast furnace, said combination comprising: a combustion chamber receiving an air-gaseous mixture for combustion therein and upward discharge of a combustion product including a blast of heated air to said blast furnace; a substantially cylindrical air-gaseous fuel mixing chamber extending along a vertical axis with the upper end thereof communicating with one end of said combustion chamber, the upper end of said mixing chamber including a conical throat of reduced diameter at its upper end where the throat is connected to and discharges an air-gaseous fuel mixture to said combustion chamber, said conical throat serving to cause rotating gases at the walls of the mixing chamber to move inwardly toward the center thereof; refractory material for forming said mixing chamber; and at least two horizontally-Extending channels formed from refractory material and separated from each other at the lower end of said mixing chamber, said channels intersecting said cylindrical mixing chamber tangentially in a manner such that one of said channels conducts a gaseous fuel into said mixing chamber for mixture therein with air conducted into said mixing chamber by the other of said channels.