Bubble/micro-bubble regime transition in a pressurized bubble column of a low surface tension liquid system

Bae, Keon; Kim, Jun Young; Go, Kang Seok; Nho, Nam Sun; Kim, Dongjae; Bae, Jong Wook; Lee, Dong Hoon

doi:10.1016/j.ces.2021.117191

Cited by 5 publications

(2 citation statements)

References 36 publications

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“…The flow regime is dependent on various factors such as the type of bubble generator, liquid physical, bubble diameter, and gas/liquid superficial velocity. [29][30][31][32][33][34] The microbubble generator used in this work can produce smaller bubbles, leading to noticeable differences in flow pattern, gas holdup, RTD, and interfacial area when compared with traditional bubble column reactors. This suggests that the effect of U L on the bubble swarm needs to be considered in contrast to traditional bubble column reactors (batch, co-current).…”

Section: Flow Regimes and Rtdmentioning

confidence: 99%

Hydrodynamics and model of gas‐liquid flow in microbubble column reactors

Xie,

Liu,

Jiang

et al. 2023

AIChE Journal

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Microbubble column reactors (MBCRs) have the significant advantages of high gas holdup, large gas‐liquid interfacial area, and excellent mass transfer performance, making them attractive for applications such as hydrogenation and oxidation. However, there is still a lack of comprehensive understanding of the gas‐liquid flow behavior in MBCRs. In this work, the effects of gas and liquid superficial velocities on flow regimes, residence time distribution, and gas holdup are investigated. The gas holdup increases linearly with the increase of gas superficial velocity, even in heterogeneous regimes, ranging from 0% to 60% at gas superficial velocities of 0–25 mm/s. Additionally, the gas‐liquid interfacial areas in MBCRs are 1–2 orders of magnitude larger than those in traditional bubble column reactors. A prediction model for gas holdup is established, and the predicted values are in good agreement with the experimental values.

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Section: Flow Regimes and Rtdmentioning

confidence: 99%

Hydrodynamics and model of gas‐liquid flow in microbubble column reactors

Xie,

Liu,

Jiang

et al. 2023

AIChE Journal

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“…[1] Hence, to meet the ever-growing hydrogen demand within a decarbonized economy toward a sustainable energy future, it is motivating to develop a low-cost hydrogen production pathway with low carbon emission. [2][3][4][5][6] In this regard, biomass, which is a clean and carbonneutral resource, has been considered a renewable alternative fuel to replace fossil fuels for hydrogen production. [7,8] Among multiple biomass conversion routes, biomass gasification is an efficient and economical process to produce hydrogen.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic modelling of hydrogen production in sorbent‐enhanced biochar‐direct chemical looping process

et al. 2022

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Hydrogen (H2) has been widely considered the clean energy carrier of choice for emerging renewable energy generation technologies. However, H2 is a secondary fuel mainly derived from natural gas. Over the past decades, research on developing H2 production technology that reduces carbon emissions has gained momentum due to increasing atmospheric levels of carbon dioxide (CO2). This study proposed a new sorption‐enhanced (SE) and biochar‐direct (BD) integrated chemical looping system for hydrogen production from biomass gasification, using iron oxide as an oxygen carrier, calcium oxide (CaO) as a CO2 adsorbent, and biochar as a reducing agent. In this study, a thermodynamic model with the proposed sorbent‐enhanced biochar‐direct (SE‐BD) chemical looping hydrogen production (CLHP) process has been developed using an Aspen Plus simulator. The effect of important process parameters, including the reactor temperature, the syngas composition, and the molar feeding ratios of iron oxide/syngas, biochar/syngas, and CaO/syngas on the performance in terms of product gas composition, iron oxide conversion, H2 yield, H2 purity, and reactor heat demand has been evaluated. The simulation results show that the addition of biochar significantly enhances the overall hydrogen yield compared to the conventional CLHP process; whereas the addition of CaO‐sorbent was found to significantly improve the H2 purity. Moreover, the exothermic lime carbonation further reduced the thermal requirements of the process. In addition, this thermodynamic simulation demonstrates that the sorbent‐enhanced biochar‐direct chemical looping hydrogen production (SE‐BD‐CLHP) process can achieve a wide operating window for complete iron oxide (Fe3O4) reduction by adjusting the CaO and biochar feeding ratio.

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Heat transfer with single- and dual-gas distribution in a pressurised bubble column

Bae

Kim

et al. 2023

Chemical Engineering Science

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Bubble/micro-bubble regime transition in a pressurized bubble column of a low surface tension liquid system

Cited by 5 publications

References 36 publications

Hydrodynamics and model of gas‐liquid flow in microbubble column reactors

Hydrodynamics and model of gas‐liquid flow in microbubble column reactors

Thermodynamic modelling of hydrogen production in sorbent‐enhanced biochar‐direct chemical looping process

Heat transfer with single- and dual-gas distribution in a pressurised bubble column

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