Apparatus for injecting solid particulate material into a vessel

Abstract

A metallurgical lance for injecting solid particulate material into a smelting vessel comprising a central core tube through which to deliver the solids material and an annular cooling jacket surrounding the central core tube. Jacket includes a long hollow annular structure formed by outer and inner tubes interconnected by a front end connector An elongate tubular structure is disposed within the hollow annular structure so to divide the interior of structure into an inner annular water flow passage and an outer annular water flow passage Tubular structure has a forward end piece which fits within front end connector of structure to form an annular end flow passage which interconnects the forward ends of water flow passage Cooling water flows forwardly down the lance through inner passage then outwardly and back around the forward annular end passage into the outer passage through which it flows backwardly along the lance to an outlet The effective cross-sectional area for water flow through end passage is less than the cross-sectional flow area of both the inner and outer passages to produce a high water flow rate in the tip region of the cooling jacket.