Apparatus for injecting gas into a vessel

Apparatus for injecting gas into a vessel, including:

• a gas flow duct extending from a rear end to a forward end from which to discharge gas from the duct;
• an elongate structure extending centrally within the forward end of the duct such that gas flowing through the forward end of the duct will flow over and along the central structure;
• a plurality of flow directing vanes disposed about the central structure adjacent the forward end of the duct to impart swirl to a gas flow to the forward end of a duct, the forward end of the central structure and the forward end of the duct co-acting together to form an annular nozzle for flow of gas from the duct with swirl imparted by said vanes;
• and
• a cooling water passage within the central structure for flow of cooling water forwardly to its forward end and to internally cool that forward end;
• wherein the forward end of the central structure includes a domed nose portion provided internally with a single spiral cooling water passage to receive water from the central water flow passage in the central structure at the tip of the nose and direct that water in a single flow around and backwardly along the nose to cool the nose with a single coherent stream of cooling water.

Apparatus for injecting gas into a vessel, including:

• a gas flow duct extending from a rear end to a forward end from which to discharge gas from the duct;
• an elongate structure extending centrally within the forward end of the gas flow duct such that gas flowing through the forward end of the duct will flow over and along the central structure;
• a plurality of flow directing vanes disposed about the central tubular structure adjacent the forward end of the duct to impart swirl to a gas flowing to the forward end of a duct, the forward end of the central structure and the forward end of the duct co-acting together to form an annular nozzle for flow of gas from the duct with swirl imparted by said vanes;
• cooling water passages within the wall of the duct and the central structure for water cooling both the duct and the central structure;
• and
• a gas inlet for introduction of hot gas into the rear end of the duct, the gas inlet comprising a refractory body defining a first tubular gas passage aligned with and extending directly to the rear end of the duct and a second tubular gas passage transverse to the first passage to receive hot gas and direct it to the first passage so that the hot gas and any particles entrained therein impinge on refractory wall of the first passage, the gas flow undergoing a change of direction in passing from the first passage to the second passage.