Gas-liquid mass transfer in a gas-liquid-solid three-phase moving bed

The gas-liquid mass transfer was investigated in a gas-liquid-solid three-phase moving bed based on the dissolved oxygen method, and a semi-quantitative gas-liquid boundary identification method was developed to measure the gas-liquid interfacial area. Results showed that the effects of gas velocity and liquid velocity on gas-liquid mass transfer in the three-phase moving bed were the same as those in the trickle bed. Since the gas-liquid interfacial area and its renewal speed were promoted at the low particle velocity and inhibited at the high particle velocity, the liquid-phase volumetric mass-transfer coefficient first increased and then decreased with the increasing particle velocity. Moreover, an empirical correlation for the liquid-phase volumetric masstransfer coefficient was established based on 296 data, and the average relative deviation was 8.11%. The sensitivity analysis showed that the liquid velocity was more important to gas-liquid mass transfer than gas velocity and particle velocity.

Automated summary

The study found that the effects of gas velocity and liquid velocity on gas-liquid mass transfer in a three-phase moving bed were similar to those in a trickle bed. As particle velocity increased, the liquid-phase volumetric mass-transfer coefficient first increased and then decreased. The sensitivity analysis revealed that liquid velocity had a greater impact on gas-liquid mass transfer than gas velocity and particle velocity.