Rotary fiberizer having two cooling jackets and an air ring

In a rotary fiberizer comprising a rotating fiberizing rotor for forming fibers from a molten fiberizable material;

• the fiberizing rotor having an annular peripheral wall with a plurality of fiberizing holes therein through which the molten fiberizable material passes to form primary fibers from the fiberizable material;
• and a means for feeding a molten fiberizable material into the fiberizing rotor;
• the improvement comprising:
• a burner/air ring assembly;
• the burner/air ring assembly having an annular air cooled burner and an annular air ring;
• the annular air cooled burner having an annular discharge means for discharging hot combustion gases in a generally downward direction into a fiberization zone adjacent an outer surface of the peripheral wall of the fiberizing rotor;
• the annular discharge means for discharging hot combustion gases from the burner having an annular cooling jacket for circulating water to cool the annular discharge means;
• the annular air cooled burner having a combustion chamber with a combustion chamber cooling jacket for controlling the temperature of inner and outer sidewalls and an upper wall of the combustion chamber which are made of a high temperature resistant alloy and not lined with a refractory material;
• the annular air ring having an annular discharge means located radially outward from the outer surface of the peripheral wall of the fiberizing rotor for discharging pressurized air in a generally downward direction into the fiberization zone;
• inlet means for introducing pressurized air into the combustion chamber cooling jacket to circulate the pressurized air through the combustion chamber cooling jacket;
• and outlet means connecting the combustion chamber cooling jacket to an air distribution chamber of the annular air ring for discharging the pressurized air form the combustion chamber cooling jacket into the annular air ring from which the pressurized air is discharged through the annular discharge means of the annular air ring.