曝气方式对多柱气升式光生物反应器中气泡传质特性的影响研究

IF 1.4 4区 工程技术 Q3 ENGINEERING, CHEMICAL
Shuangcheng Fu, Chenxi Liu, Faqi Zhou, Tao Yu, Kewei Li, Yue Zhang, Shenghu Yan, Xiang Zhang
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引用次数: 0

摘要

气泡的传质在微藻培养中非常重要。本研究以提高微藻培养效率为目的,采用计算流体动力学(CFD)方法研究了多柱气升式光生物反应器(PBR)中曝气方式对上升柱内气泡传质的影响,以及不同曝气方式下PBR内的水动力条件。此外,还分析了上升柱中气泡的产生时间、脱离直径和平均体积传质系数。此外,还将实验结果与微藻培养的模拟结果进行了比较。结果表明,当曝气速率为 0.2 vvm 时,整体曝气方式产生的气泡混合强度和传质效率最低。相反,在半曝气和交替曝气方式下,液体的混合强度和气泡的传质系数都有所提高。但结果表明,在半曝气方式下,流场分布并不均匀,存在明显的高速区和低速区。相比之下,交替曝气方式下 PBR 的流场分布更加均匀,适合高浓度微藻培养。这项研究有效地提高了 PBR 的混合强度和二氧化碳转移率。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Research on the influence of aeration manners on the mass transfer characteristics of bubbles in multi-column airlift photobioreactor

Mass transfer of bubbles is important in microalgae cultivation. In this study, aiming to improve the microalgae culturing efficiency, computational fluid dynamics (CFD) was adopted to study the influence of the aeration manners on mass transfer of bubbles within ascending columns in multi-column airlift photobioreactor (PBR) and the hydrodynamic conditions within the PBR under different aeration manners. In addition, the bubble generation time, the detachment diameter, and the average volumetric mass transfer coefficient of bubbles in ascending columns were analyzed. Furthermore, the experimental results were compared with the simulation results obtained from microalgae cultivation. The results showed that the whole aeration manner yields the lowest mixing strength and mass transfer efficiency of bubbles at an aeration rate of 0.2 vvm. Conversely, both the mixing strength of the liquid and mass transfer coefficient of bubbles were enhanced under the half and alternate aeration manners. However, the results demonstrated that the distribution of the flow field was not uniform under the half aeration manner and there were obvious high-speed and low-speed zones. In contrast, the flow field distribution in the PBR was more uniform under the alternate aeration manner, which was suitable for microalgae cultivation at high concentration. This study effectively enhanced the mixing strength and CO2 transfer rate in the PBR.

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来源期刊
自引率
11.10%
发文量
111
期刊介绍: Asia-Pacific Journal of Chemical Engineering is aimed at capturing current developments and initiatives in chemical engineering related and specialised areas. Publishing six issues each year, the journal showcases innovative technological developments, providing an opportunity for technology transfer and collaboration. Asia-Pacific Journal of Chemical Engineering will focus particular attention on the key areas of: Process Application (separation, polymer, catalysis, nanotechnology, electrochemistry, nuclear technology); Energy and Environmental Technology (materials for energy storage and conversion, coal gasification, gas liquefaction, air pollution control, water treatment, waste utilization and management, nuclear waste remediation); and Biochemical Engineering (including targeted drug delivery applications).
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