Nozzle for fuel and oxygen lance assembly

Abstract

A lance for directing oxygen and fuel oil to a basic oxygen furnace includes a central fuel pipe, an insulating pipe around said fuel pipe, an oxygen pipe and water coolant pipes, all concentrically disposed. The central fuel pipe and insulating pipe have closed bottom walls and a plurality of relatively narrow fuel tubes are connected to bores in the bottom wall of the fuel tube, extend through the bottom wall of the insulating pipe and extend into three converging-diverging orifices. The narrow fuel tubes are supported in cantilever fashion and are concentric with each orifice.

What is claimed is: 
     
       1. For a lance adapted for mixing oxygen and fuel and including, a first central fuel pipe,   a second pipe concentric with said first pipe and providing an insulating space around said fuel pipe,   a third pipe concentric with and providing an oxygen conveying space around said second pipe,   fourth and fifth pipes concentric with each other and said other pipes providing concentric coolant circulating spaces;   a nozzle head,   a first lower closure wall connected at its peripheral edge to said fifth pipe,   at least one cylindrical passage means opening outwardly of said first closure wall to provide an oxygen and fuel discharge orifice,   an extension of said fourth pipe providing at a lower portion of said nozzle head a coolant chamber surrounding said cylindrical passage and communicating with said coolant circulating spaces,   a second closure wall on said third pipe above said first closure wall,   a third closure wall on said second pipe enclosing said insulating space and being disposed above said second closure wall,   a fourth closure wall on said first pipe disposed above said third closure wall, and   a tube connected to said fourth closure wall and communicating with said first fuel pipe,   said tube being connected to and extending through said third closure wall, and   said tube having a discharge end .[.terminating.]. within said cylindrical passage. .[.in spaced relation relative to said oxygen and fuel discharge orifice.].   
     
     
       2. The invention in accordance with claim 1, said closure walls extending transversely to the axis of said lance.   
     
     
       3. The invention in accordance with claim 1, wherein said tube is supported on said third and fourth closure walls in cantilever relation.   
     
     
       4. The invention in accordance with claim 3, said discharge orifice having a cylindrical wall portion converging inwardly and then outwardly toward said first closure wall.   
     
     
       5. The invention in accordance with claim 4, said cylindrical wall having a portion thereof disposed between said converging diverging portion of constant cross sectional diameter.   
     
     
       6. The invention in accordance with claim 5, the discharge end of said tube terminating outwardly  relative to said portion of constant cross section.   
     
     
       7. The invention is accordance with claim 3, including supporting means for supporting an intermediate portion of said tube on said third pipe.   
     
     
       8. The invention in accordance with claim 7, said supporting means including circumferentially spaced space elements supported in said orifice adjacent to said coolant chamber.