China Nonferrous Metallurgy

Aiming at the change rule of the jet flow field in the bath area of the oxygen coal combustion smelting-separation furnace, by means of theoretical analysis and experimental study, investigation is made of the motion mode and penetration behavior of the jet flow of the side-blown gas in the bath respectively. The ascending motion model of jet bubbles is established based on the force condition of bubbles in the jet flow. By comparing the experimental phenomena, the rule of different motion stages of jet bubbles is verified. It is shown by jet penetration phenomenon and theoretical analysis results that the injection flow is the main factor affecting the side-blowing penetration distance; when the flow is constant, the diameter of oxygen lance casts a greater impact on the penetration behavior than immersion depth of the oxygen lance; based on this, a mathematical model of the side-blowing jet penetration distance of circular tube oxygen lance is established, and it is known from this that the energy change of the side-blown jet penetration distance is mainly kinetic energy conversion, which further provides theoretical guidance for the design of oxygen lance for oxygen coal combustion smelting-separation furnace and the optimization of bath flow field.