Bubble characteristics in a novel microbubble gas-liquid-solid fluidized bed

IF 3.8 3区 工程技术 Q3 ENERGY & FUELS Chemical Engineering and Processing - Process Intensification Pub Date : 2024-10-06 DOI:10.1016/j.cep.2024.110018
Shuai Gao , Yongli Ma , Mingyan Liu
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Abstract

The bubble characteristics are critical in gas-liquid-solid fluidized beds and microbubbles significantly enhance mass transfer in multiphase systems. In this work, a novel concept of microbubble gas-liquid-solid fluidized bed is proposed. Telecentric camera is employed to measure and analyze the microbubble characteristics including bubble size and gas holdup in this three-phase fluidized bed. Additionally, solid holdups in the fluidized bed are also examined. The results demonstrate that the bubble size adheres a lognormal distribution and is significantly influenced by superficial gas velocity. Bubble diameter exhibit a relatively uniform distribution in the radial direction. Bubbles exceeding than 1 mm substantially affect local gas holdup, and the microbubble flow promotes a more uniform distribution of local gas holdup in radial position. The average gas holdup deviation is less than 15 % compared to overall gas holdup obtained from pressure drop. Although microbubbles are more abundant, larger bubbles (> 1 mm) contribute more to solid particle fluidization. This paper introduces a methodology for assessing smaller-sized microbubbles in three-phase flow. The hydrodynamic analysis of the microbubble gas-liquid-solid fluidized bed establishes a foundational framework for enhancing gas-liquid mass transfer in fluidized bed.

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新型微气泡气-液-固流化床中的气泡特性
气泡特性在气-液-固流化床中至关重要,微气泡可显著提高多相系统中的传质效果。本研究提出了微气泡气-液-固流化床的新概念。采用远心相机测量和分析三相流化床中的微气泡特性,包括气泡大小和气体截留。此外,还考察了流化床中的固体滞留情况。结果表明,气泡大小呈对数正态分布,受表面气体速度的影响很大。气泡直径在径向分布相对均匀。超过 1 毫米的气泡会严重影响局部气体容积,而微气泡流则会促进局部气体容积在径向位置上的更均匀分布。与通过压降获得的整体气体容积相比,平均气体容积偏差小于 15%。虽然微气泡更多,但较大气泡(1 毫米)对固体颗粒流化的贡献更大。本文介绍了一种评估三相流中较小尺寸微气泡的方法。微气泡气-液-固流化床的流体力学分析为增强流化床中的气液传质建立了一个基础框架。
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来源期刊
CiteScore
7.80
自引率
9.30%
发文量
408
审稿时长
49 days
期刊介绍: Chemical Engineering and Processing: Process Intensification is intended for practicing researchers in industry and academia, working in the field of Process Engineering and related to the subject of Process Intensification.Articles published in the Journal demonstrate how novel discoveries, developments and theories in the field of Process Engineering and in particular Process Intensification may be used for analysis and design of innovative equipment and processing methods with substantially improved sustainability, efficiency and environmental performance.
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