利用超声场鼓泡塔和双电导探针气泡特征参数测量仪实时测定了加入不同种类和不同浓度添加剂前后鼓泡塔内氨气气含率与传质系数变化规律。实验结果表明：无添加剂时，超声频率为20-50-100 kHz组合，功率100 W时，鼓泡塔内气含率比无超声作用时增加了37%~74%，传质系数增大了39%~61%；气含率和传质系数随加入正辛醇浓度的增大呈现逐渐增长的趋势，当正辛醇浓度超过1.0%(V)时，气含率和传质系数趋于稳定；超声频率为20-50-100 kHz组合，超声功率100 W，正辛醇浓度为1.0%时鼓泡塔内气含率比无添加剂加入时增加了20%，传质系数增大了16%，可见超声场与添加剂协同作用有利强化气液相间分布、提高传质效果。%This study deals with using a bubble feature measuring system named duplex conductivity probe to investigate the effects of kinds and concentrations of additives on the gas holdup and mass transfer coefficient in a bubble column with ultrasonic radiation of one frequency or multi-frequency. The results show that, in reverberating ultrasonic field of multi-frequency combination of 20-50-100 kHz and power of 100 W, the gas holdup of the without additives system increases 37%~74%, and at the same time, the mass transfer coefficient of the system increases 39%~61%. The gas holdup and the mass transfer coefficient of the system increase with increasing the concentration of octanol additive when the concentration is below 1.0%(V), and then they almost keep constant as the octanol additive concentration is increased beyond 1.0%. In reverberating ultrasonic field of multi-frequency combination of 20-50-100 kHz and power of 100 W, when the octanol additive concentration is 1.0%, the gas holdup in the bubble column is about 20% higher and the mass transfer coefficient is 16%higher than those in the case of the system without additive. The results show that the ultrasonic field and the additives have significant synergic effect of enhancing the dispersion and the mass transfer between the gas-liquid phases.
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