Gas injection lance

Abstract

A hot gas injection lance () for injecting hot gas into a vessel () is made of three modules (A,B andC) which all fabricated separately and brought together in successive steps and connected together by releasable fastenings. Lance module (A) is a main duct module providing an elongate duct () through which to direct hot gas into an upper region of the vessel. Lance module (B) is a gas inlet module through which to direct hot gas into duct () of module (A). Lance module (C) is a central module which includes an elongate central tubular structure () that extends within the gas flow duct () and carries at its lower end a series of swirl imparting tubular structure () that extends within the gas flow duct () and carries at its lower end a series of swirl imparting vanes () for imparting swirl to the gas flow exiting the duct. Main duct module (A) has a mounting flange () that abuts a flange () on vessel () and the flanges () are fastened together by bolts (). Gas inlet module has a lower mounting flangewhich abuts a flange () at the upper end of module (A) and the flanges () are connected together by bolts (). Central module (C) has a mounting flange () that abuts a flange () at the upper end of inlet module (B) and the flanges () are fastened together by bolts ().