초록 ▼

An apparatus for introducing gas recirculation into a furnace to control steam temperature includes a hot air chamber for receiving hot air from an air preheater. The hot air chamber has at least one outlet communicating with the interior of the furnace. The apparatus includes a recirculation gas ch

An apparatus for introducing gas recirculation into a furnace to control steam temperature includes a hot air chamber for receiving hot air from an air preheater. The hot air chamber has at least one outlet communicating with the interior of the furnace. The apparatus includes a recirculation gas chamber for receiving recirculation gas from a recirculation fan and includes at least one outlet communicating with the interior of the furnace. Each of the chambers is disposed about at least a portion of the circumference of the furnace with one of the chambers disposed above at least a portion of the other. Ducts are provided between the hot air chamber and the air preheater and between the recirculation gas chamber and the recirculation fan to provide communication between the elements. A passageway is disposed between the hot air chamber and the recirculation gas chamber. The apparatus includes a valve movable between a first position wherein flow through the duct from the recirculation fan is blocked and flow through the passageway is open and a second position wherein flow through the passageway is blocked and flow through the duct from the recirculation fan in open.

대표청구항 ▼

[ Having thus described our invention, we claim:] [1.] Apparatus for cooperation with an associated furnace which comprises:a hot air chamber for receiving hot air from an associated air preheater, said hot air chamber having at least one outlets communicating with the interior of the associated fur

[ Having thus described our invention, we claim:] [1.] Apparatus for cooperation with an associated furnace which comprises:a hot air chamber for receiving hot air from an associated air preheater, said hot air chamber having at least one outlets communicating with the interior of the associated furnace;a recirculation gas chamber for receiving recirculation gas from a recirculation fan, said recirculation gas chamber having at least one outlets communicating with the interior of the associated furnace, each of said chambers being disposed about at least a portion of the circumference of the associated furnace, at least a portion of one of said chambers being disposed above at least a portion of the other chamber;a duct from the associated air preheater communicating with said hot air chamber;a duct from the associated recirculation fan communicating with said recirculation gas chamber;a passageway disposed between said hot air chamber and said recirculation gas chamber; anda valve movable between a first position wherein flow through said duct from the associated recirculation fan is blocked and flow through said passageway between said hot air chamber and said recirculation gas chamber is open to allow flow therebetween and a second position wherein flow through said duct from the associated recirculation fan is not blocked and flow through said passageway between said hot air chamber and said recirculation gas chamber is closed to prevent flow therebetween.