Patent ID: 6334976
Filing Date: 2002-01-01
Classification: C21C,F27B,F27D

Abstract:
A lance for providing at least one coherent jet comprising:(A) a main passageway communicating with at least one nozzle for providing main gas from the lance; (B) a first annular passageway coaxial with and radially spaced from the main passageway for flow of cooling fluid; (C) a second annular passageway coaxial with and radially spaced from the first annular passageway for flow of first flame envelope fluid; (D) a third annular passageway coaxial with and radially spaced from the second annular passageway for flow of second flame envelope fluid; (E) a fourth annular passageway coaxial with and radially spaced from the third annular passageway for flow of cooling fluid, and wherein the first and fourth annular passageways straddle the second and third annular passageways; and (F) at least one flow passage for flow of cooling fluid between the first annular passageway and the fourth annular passageway.