Influence of Stokes number on the particle phase distribution behaviors in a rolling circulating fluidized beds (RCFB)

Wang, Pengwei; Zhao, Tong; Li, Kai; Wang, Zhilong

doi:10.1007/s12650-020-00736-w

Cited by 4 publications

(2 citation statements)

References 20 publications

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“…In contrast, roll frequency has a limited influence on particle shear and, thus, has a minor effect on particle distribution. 33 In addition to the previous validation of rolling simulations, 29 the effect of particle size on the abrupt exit of particles from the bed, 34 particle Stokes number, 35 heat transfer, 36 and dynamic control of particle distribution in rolling circulating fluidized beds have also been studied. 37 2.2.…”

Section: Exhaust Gas Cleaning Systems (Egcs)mentioning

confidence: 99%

Mitigation of Ship Emissions: Overview of Recent Trends

Sarbanha

Larachi

Taghavi

et al. 2023

Ind. Eng. Chem. Res.

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The urgency of reducing flue gas pollution in maritime transport makes it necessary to take a holistic view of its sustainability and environmental impacts. Among the approaches to reducing ship exhaust emissions, marinized gas scrubbers, given their ability to be retrofitted to existing ships, are a central element in the tradeoff against the use of expensive low-sulfur fuels. However, compounding this issue, the priority of reducing greenhouse gas (GHG) emissions in the coming decades poses new challenges to emissions compliance. The use of exhaust gas cleaning systems to remove SO X , NO X , and particulate matter (PM) emissions will be enhanced in the short to medium term by GHG reductions. In this study, the different types of scrubbers for seaborne operation and the potential risks associated with their secondary emissions will be critically reviewed. In addition, NO X reduction systems and recent efforts to reduce CO 2 through onboard carbon capture systems or alternative fuel combustion will also be covered.

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Section: Exhaust Gas Cleaning Systems (Egcs)mentioning

confidence: 99%

Mitigation of Ship Emissions: Overview of Recent Trends

Sarbanha

Larachi

Taghavi

et al. 2023

Ind. Eng. Chem. Res.

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“…It was observed that the maldistribution of bubbles and particles across all fluidization regimes resulted in a reduction in local heat transfer coefficient and pressure drop. ,, Nevertheless, in a rolling circulating fluidized bed, the rate of particle-to-wall heat transfer was markedly enhanced . The hydrodynamic and heat transfer properties of rolling circulating fluidized bed reactors (CFBRs) have been extensively studied for marine applications, − with a focus on investigating the impact of rolling amplitude, particle size, and distribution control on fluidized bed performance.…”

Section: Introductionmentioning

confidence: 99%

Solids Mixing in Marinized Bubbling Fluidized Beds: Gas Distribution Study

Sarbanha

Larachi

Taghavi

2023

Ind. Eng. Chem. Res.

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Marinized bubbling fluidized beds hold promise for reducing CO 2 , NO X , and SO X in ship exhaust gases, but their use at sea is hampered by a limited understanding of the influence of sea waves on hydrodynamics, heat transfer, and efficiency. To address this gap, this study used direct visualization techniques to investigate the solids mixing and hydrodynamics of bubbling fluidized beds under different gas distribution patterns in pseudo-2D vertical, inclined, and rolling beds. Digital Image Analysis (DIA) was used to determine the Lacey mixing index and the local void fraction, while Particle Image Velocimetry (PIV) was used to capture the particle velocity fields. Additionally, the effects of tilt angles and oscillation parameters of the nonvertical beds were compared with the conventional straight bubbling fluidized bed unit. The uniform inlet distribution of the fluidizing agent was compared with a variety of convex feed distributions at the bed entrance to correct for the negative effects of static/dynamic deviations from bed verticality necessary for optimal operation of bubbling fluidized bed reactors in marine environments.

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