Heat Transfer between Heated Top Jet and Bottom Blown Bath

Abstract

　　　Many types of gas injection systems are employed in the current refining processes. Cold model experiments have extensively been carried out to find out an optimum gas injection condition by focusing on the mass transfer between the injected gas and molten metal in the bath. The top and bottom gas injection process is treated in this water model study. Emphasis is placed on an optimum combination of the positions of top lance and bottom gas injection nozzles because the positions are closely associated with the process efficiency. The conventional mass transfer method however is not easy to carry out and treatment of used liquids containing undesirable materials is not necessarily inexpensive. A method of finding out the optimum combination was proposed on the basis of an analogy between heat and mass transfer. The heat transfer between injected gas and water in the bath was measured for validating this method.