Visualization of Liquid Reaction in Submerged Top-blow Agitation Process

摘要

The liquid reaction in a submerged top-blow agitation process was studied using planar laser-induced fluorescence (PLIF) technology based on the principle of fluorescence quenching. The liquid reaction effects were analyzed using the reaction degree theta(t) and reaction timet(95)under different conditions. The results show that the liquid reaction time decreases obviously for an increase in the air flow rate and submerged depth of the spray gun. The injection position of Fe(3+)has a great influence on the reaction process; the reaction process is also different under other blowing conditions when Fe(3+)is injected at the bottom. The reaction time of Fe(3+)at the bottom injection position is higher than that at the top injection position; increasing the air flow rate and submerged depth of the spray gun can effectively reduce the difference in the reaction times at the two injection points. The effect of the injection position on the reaction time is eliminated when the spray gun submerged depth is close to the reactor bottom. The initial volume of Fe(3+)has no obvious effect on the reaction time; however, an increase in the initial molarity of Fe(3+)can decrease the reaction time.