| 摘要 |
A burner arrangement 50 for ferrous scrap melting and the like includes a fuel outlet 56 and a primary oxidant (O2) supply outlet 52 communicating with a mixing chamber 58. The burner 50 also has a main outlet 62 and secondary oxidant supply outlets 54. In addition there is a convergent-divergent nozzle communicating with the mixing chamber 58. A valve 64 controls the flow of gaseous fuel to the outlet 56, and valves 66 and 68 control the flow of primary and secondary oxidant respectively to the outlets 52 and 54 respectively. In operation, oxidant is supplied to the outlets 52 and 54, hot flame or combustion gases are accelerated through the nozzle 60 with the result that a sonic or supersonic velocity can be created. Such high velocities facilitate the penetration of the combustion gases through a slag layer into molten metal. <IMAGE> |
