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为了研究鼓泡塔反应器两级气泡模型在高黏度下的适用性,采用动态气体逸出法,在内径为286 mm,总高为7 200 mm的鼓泡塔中考察了液体黏度(1.2×10-3—210.4×10-3Pa·s)和操作条件对塔内总气含率,大、小气泡相含率和大、小气泡上升速度等两级气泡模型参数的影响。结果表明:床层总气含率随表观气速的增加而增大,大气泡相含率受液体黏度的影响较小,受表观气速的影响较大;小气泡相含率随黏度的增加而迅速下降,在高气速时受表观气速的影响较小。大、小气泡上升速度均随液体黏度的增加而降低,但随表观气速的升高有着不同的变化关系:前者明显升高,后者略有降低。大气泡直径随着黏度增大而稍有增大,小气泡直径随着黏度增大急剧减小。
In order to study the applicability of two-stage bubble model of bubble column reactor under high viscosity, the dynamic viscosity of liquid was measured in a bubble column with inner diameter of 286 mm and total height of 7 200 mm by dynamic gas evacuation method (1.2 × 10-3-210.4 × 10-3Pa · s) and operating conditions on the parameters of two-stage bubble model, such as the total gas holdup, the large and small bubble phase holdup, and the large and small bubble rising velocity. The results show that the total gas holdup of the bed increases with the increase of apparent gas velocity, and the holdup of large bubbles is less affected by the viscosity of the liquid and greatly affected by the apparent gas velocity. Of the rapid decline in the high air speed by the apparent air velocity less affected. The rising velocity of large and small bubbles all decreased with the increase of liquid viscosity, but with the increase of apparent air velocity, there were different changes: the former increased obviously and the latter decreased slightly. Large bubble diameter increases slightly with increasing viscosity, small bubble diameter decreases sharply with increasing viscosity.