Abstract
A flash smelting furnace for copper smelting is equipped with a waste-heat boiler for heat recovery and the elimination of flue dust from off-gas. Water tubes in the boiler are exposed directly to the corrosive environment by high temperature $SO2$ gas and also by flue dust. Therefore, it is very important to know the flow behavior of the gas and the dust. The purposes of this study are to grasp the flow pattern both in the entire boiler and in the local area, and also to optimize the injection method of the slag cleaning furnace off-gas injected for the oxidation of sticky sulfide dusts. A 1/20-scale model, $1.5 m long× 0.3 m wide× 0.9 m$ high, made of transparent acrylic sheets and pipes, is adopted for this study. Air at room temperature is used as the working fluid and talc particles with an average diameter of 30 microns are used as a substitute for flue dust. The flow visualization in the local area is accomplished by laser-sheet techniques with a high-speed camera, whereas the entire flow pattern is observed using a smoke trace method. As a result, a vortex of about 10 cm diameter is observed to form in the vicinity of the castable refractories layer installed on the water tubes above the gas-inlet at the front wall of the boiler. Also, an optimum injection nozzle pattern of the slag cleaning furnace off-gas is proposed to provide the most effective mixing with flash smelting furnace off-gas and oxidation of flue dust.
Published Version
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