鼓泡床流体力学特性研究

在直径45 mm的鼓泡床冷态装置中,以煤油作为液相,氮气作为气相,研究了气含率、气泡平均粒径、两相相间滑动速度的变化规律。结果表明:反应器内流体的流动处于气泡聚并控制区,气含率随着两相流速的增加而增加;气泡平均粒径随着气相表观流速的增加而增加,随着液相表观流速的增加而降低。实验发现,在相同的条件下,与较小直径反应器相比,随着反应器直径的增大,气泡聚并作用增强,气含率下降,气泡粒径增大。

HYDRODYNAMIC CHARACTERISTICS IN BUBBLE COLUMNS

The changing rules of gas holdup, Sauter mean diameter (SMD) of bubbles, slip velocity between gas and liquid phases of nitrogen-kerosene system in a cold bubble column with a diameter of 45 mm were investigated. The experimental results show that in the bubble coalescence control region, the average gas holdup increases as the velocity of the gas and liquid phase increases, the SMD of bubbles increases with increasing the gas velocity, but decreases with the increased liquid velocity. Under the same conditions, compared with the results in smaller column, larger reactor has the stronger bubble coalescence effect and larger bubble diameter, while the gas holdup is reduced.