Gas-liquid mass transfer in microbubble gas-liquid-solid fluidized bed

doi:10.16085/j.issn.1000-6613.2024-1429

Abstract

Abstract:

Gas-liquid-solid fluidized beds are widely used in industrial reactors due to their efficient interphase contact, mixing and mass transfer characteristics. Microbubbles have a large specific surface area and long residence time, and the combination of microbubbles and gas-liquid-solid fluidized beds to form a new type of high-efficiency microbubbles gas-liquid-solid fluidized beds has a greater potential for application in the chemical reaction system that needs to improve the gas-liquid mass transfer rate. At present, no report has been seen to carry out the study of microbubble gas-liquid mass trans-fer characteristics of gas-liquid-solid fluidized bed. In this paper, a microbubble gas-liquid-solid fluidized bed experimental device system was constructed, and the dynamic dissolved oxygen method was used to study the effects of operating conditions, particle static bed height and particle size on the microbubble gas-liquid mass transfer performance. The results showed that the volumetric mass transfer coefficient was affected by the gas-liquid phase interfacial area and liquid-side mass transfer coefficient, which increased with the increase of superficial gas velocity and superficial liquid velocity of main flow, and decreased with the increase of particle static bed height and particle size. The gas-liquid phase interfacial area was affected by both gas holdup and bubble size, and was more strongly affected by gas holdup. The gas-liquid phase interfacial area increased with the increase of the superficial gas velocity and the superficial liquid velocity of main flow. In the microbubble gas-liquid-solid fluidized bed using water, air, and glass bead particles as the three-phase medium, the gas-liquid phase interfacial area increased from 77.09m^-1 to 229.43m^-1 when the superficial liquid velocity of main flow was 111.11mm/s and the superficial liquid velocity of auxiliary flow was 55.56mm/s, the temperature was 20℃, and the superficial gas velocity increased from 3.33mm/s to 15.33mm/s. The gas-liquid phase interfacial area decreased with the increase of the particle static bed height and the particle size, and with the increase of the solid holdup. Increasing the superficial fluid velocity and particle static bed height can strengthen the turbulent flow in the microbubble three-phase fluidized bed and increase the liquid-side mass transfer coefficient.

Key words: fluidized-bed, multiphase flow, microbubble, gas-liquid mass transfer

摘要：

气液固流化床因具有高效的相间接触、混合和传质特性，被广泛应用于工业反应器。因微气泡具有较大的比表面积、较长的停留时间，将微气泡与气液固流化床相结合，形成新型高效微气泡气液固流化床，对于需要提高气液传质速率的化学反应体系具有较大的应用潜力。目前尚未见到开展气液固流化床微气泡气液传质特性研究的报道。本文搭建了微气泡气液固流化床实验装置系统，采用动态溶氧法，研究了操作条件、颗粒静止床层高度和颗粒尺寸等特性对微气泡气液传质性能的影响。研究结果表明，气液体积传质系数受气液相界面积和液侧传质系数的影响，随表观气速和主水流表观液速的增大而增大，随颗粒静止床层高度和颗粒尺寸的增大而减小。气液相界面积同时受气含率和气泡尺寸的影响，受气含率的影响更强。气液相界面积随着表观气速和主水流表观液速的增大而增大。在采用水、空气、玻璃珠颗粒为三相介质的微气泡气液固流化床中，当主水流表观液速为111.11mm/s、辅水流表观液速为55.56mm/s、温度为20℃、表观气速从3.33mm/s增大到15.33mm/s时，气液相界面积由77.09m^-1增大到229.43m^-1。随着颗粒静止床层高度和颗粒尺寸的增大，固含率增大，气液相界面积减小。增加流体表观速度和颗粒静止床层高度，可以强化微气泡三相流化床内的湍流流动，增大液侧传质系数。

关键词: 流化床, 多相流, 微气泡, 气液传质

CLC Number:

TQ021.4

GAO Shuai, MA Yongli, LIU Mingyan. Gas-liquid mass transfer in microbubble gas-liquid-solid fluidized bed[J]. Chemical Industry and Engineering Progress, 2025, 44(10): 5590-5598.

高帅, 马永丽, 刘明言. 微气泡气液固流化床气液传质特性[J]. 化工进展, 2025, 44(10): 5590-5598.

Figures/Tables 13

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