Multifunction injector and relative combustion process for metallurgical treatment in an electric arc furnace
AssigneeTechint Compagnia Tenica Internazionale S.p.A.
InventorsFrancesco Memoli, Mauro Bianchi Ferri, Marcello Pozzi, Enrico Malfa
Life of this patent
Estimating the term…
Abstract
A multifunction injector (10, 11, 12) comprising a De Laval nozzle (20) adapted to act as a burner at subsonic or supersonic speed, combined with a plurality of nozzles (31, 32) for fuel and comburant respectively, arranged in two rings, concentric and co-axial to said De Laval nozzle (20) and externally protected by a specifically shaped protection cavity (40).
Claims9
Multifunction injector (10, 11, 12) having a central axis, said injector comprising a De Laval nozzle (20) adapted to act as a burner at subsonic or supersonic speed, combined with a plurality of fuel nozzles (31) and an external ringa of comburant nozzles (32) respectively, arranged in two rings, concentric and coaxial to said De Laval nozzle (20) and externally protected by a specifically shaped protection cavity (40) wherein the external ring of comburant nozzles (32) has ducts (33) provided on a slope in relation to the central axis wherein said ducts (33) are arranged in a spiral form to cause a swirl rotation of oxidizing gases or fuels and the specifically shaped protection cavity (40) is conically shaped.
Dependencies are inferred from the claim text.