Patent Number: 6,761,779

Title: Preheating of metal strip, especially in galvanizing or annealing lines

Abstract: A method is disclosed for preheating a metal strip in at least one direct fired preheating section of a furnace for limiting the oxidation of the metal strip. The method includes installing burners in the preheating section along its length for establishing a plurality of preheating sub-zones of unit length corresponding to one burner. The air and fuel settings for each burner are adjusted in accordance with a desired heat demand. Subsequent steps include operating a variable number of downstream burners at full power to establish a preheating zone of variable length to produce the desired heat demand, and extinguishing a second variable number of upstream burners to establish a corresponding variable recovery zone.

Inventors: Delaunay; Didier (Breuillet, FR), Morel; Alain (Villeurbanne, FR)

Assignee: Stein Heurtey

International Classification: C21D 1/34 (20060101); C21D 1/52 (20060101); C21D 9/56 (20060101); C21D 11/00 (20060101); C21D 001/00 ()

Expiration Date: 07/12012