Rotary hearth furnace and method of operating the same

Details Rotary hearth furnace and method of operating the same Rotary hearth furnace and method of operating the same

2006-10-31

2011-10-11

King, Roy (Department: 1733)

Metallurgical apparatus

With means treating or handling gases exhausted by treating...

Having means to treat or handle gases evolving from rotary...

C110S203000, C110S205000, C110S210000, C110S211000, C110S214000, C075S484000, C266S144000, C266S149000

Reexamination Certificate

active

08034283

ABSTRACT:
A rotary hearth furnace includes an exhaust gas eductor. The exhaust gas eductor includes a compartment-defining portion and an exhaust duct. The compartment-defining portion is provided on part of a ceiling of the rotary hearth furnace in an exhaust gas discharge region, and an exhaust duct is connected to the compartment-defining portion. The lower surface of the compartment-defining portion lies higher than the lower surface of the other portion of the ceiling. The compartment-defining portion defines a compartment where the exhaust gas stays. The exhaust duct can include a cooling medium injection nozzle. The furnace increases fuel efficiency by completely burning combustible components remaining in exhaust gas generated in the rotary hearth furnace so as to use the combustible components efficiently for the heating and reduction reaction in the rotary hearth furnace, without problems in producing reduced iron.

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