C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
C22B 5/10 (2006.01) C21B 13/00 (2006.01) C21B 13/08 (2006.01) C22B 1/24 (2006.01) C22B 13/08 (2006.01) F27B 7/08 (2006.01) F27B 7/32 (2006.01) F27D 3/00 (2006.01) F27D 99/00 (2010.01)
Patent
CA 2243124
Apparatus (10) for preheating self-reducing pellets for direct use in ironmaking or steelmaking in which a preheat chamber (14) contains the pellets and is primarily externally heated using waste exhaust gases and secondarily heated directly by using an internal preheat burner (24). The preheat chamber gases are vented into the external heating chamber (26) where any CO present is post-combusted to produce CO2 with the energy from the post-combustion used to contribute to external heating of the preheat chamber (14).
L'invention concerne un dispositif (10) de préchauffage de boulettes à autoréduction, destinées à être utilisées directement dans l'élaboration du fer ou de l'acier. Le dispositif comporte un four de préchauffage (14) renfermant les boulettes et chauffé en premier lieu de manière externe par effluent gazeux, et en second lieu directement par brûleur interne de préchauffage (24). Les gaz du four de préchauffage sont purgés dans le compartiment de chauffage extérieur (26), où une post-combustion de toute trace d'oxyde de carbone donne du gaz carbonique, l'énergie de la post-combustion contribuant au chauffage externe du four de préchauffage (14).
Hunt Harry D.
Jaffre Richard T.
Chaparral Steel Company
Ridout & Maybee Llp
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