关键词: 外环流浆态床, 气含率, 浆液循环速度, 预测, 模型

Abstract: The prediction of gas holdup and slurry circulating velocity is important in the design of external-loop airlift slurry reactors. The effect of superficial gas velocity, fine particle concentration, flow resistance of slurry in the downcomer on the overall average gas holdup and slurry circulating velocity were investigated in a novel type of external-loop airlift slurry reactor cold test system. The results suggest that the overall average gas holdup increases with the increase of superficial gas velocity and flow resistance in downcomer, and decreases with the increase of fine particle concentration; the slurry circulating velocity increases with the increase of superficial gas velocity, and decreases with the increase of fine particle concentration and flow resistance in downcomer. An empirical correlation was developed to predict the overall average gas holdup; based on the momentum balance under steady state operating conditions, a model was developed to predict the slurry circulating velocity; on the whole, good agreements between the calculated and measured values were obtained. These results are useful for the design of novel reactor.

Key words: external-loop airlift slurry reactors, gas holdup, slurry circulating velocity, prediction, model