Experimental evaluation of the convection heat transfer coefficient of large particles moving freely in a fluidized bed reactor

García-Gutiérrez, L.M.; Hernández-Jiménez, F.; Cano-Pleite, Eduardo; Soria-Verdugo, Antonio

doi:10.1016/j.ijheatmasstransfer.2020.119612

Cited by 17 publications

(6 citation statements)

References 39 publications

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“…Hence, the values for h eff are typically large, ∼300 ± 40 W m –2 K –1 , but reduce to ∼220 ± 40 W m –2 K –1 when the active particle releases gas (as analyzed with 4.6 mm diameter spheres of graphite and dry ice at U / U mf of ∼1.5). Garcia-Gutierrez et al found that while the model proposed by Chao et al can predict the heat transfer coefficient of a subliming particle (of dry ice) at moderate and high fluidization velocities, it overestimates the heat transfer coefficient at low U / U mf because the buoyancy effects are significant and the active particle can exhibit a flotsam behavior . Further information about the changes in heat transfer coefficient during the full history of biomass thermal treatment would be beneficial, allowing one to extract the influence of the gas release during drying and devolatilization; however, experimental complications arise as decomposition of biomass affects its shape, density, thermal conductivity, and more.…”

Section: Influence Of Fluidized Bed On Combustionmentioning

confidence: 99%

Combustion of Biomass in Fluidized Beds: A Review of Key Phenomena and Future Perspectives

Kwong

Marek

2021

Energy Fuels

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This review presents recent advances in research on fluidized bed combustion of solid biomass. While the main focus is on thermochemical processes occurring in fluidized beds, applicable investigations on biomass combustion from other research areas are also described as they often provide fundamental insight about the processing of biomass, applicable also in the context of fluidized beds. This review aims to summarize lessons learned and indicate some remaining gaps in the existing body of knowledge. The review discusses combustion in separate stages, such as drying, pyrolysis, and homo-and heterogeneous combustion, and characterizes how fluidized beds affect combustion, discussing heat and mass transfer, material segregation, and bed agglomeration. Finally, advances in new research trends and the prospects for technology development are considered, highlighting the chemical-looping technology with its inherent potential for carbon capture, scale-up of advanced computational models, and progress in spectroscopic and tomographic studies applied to combustion.

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Section: Influence Of Fluidized Bed On Combustionmentioning

confidence: 99%

Combustion of Biomass in Fluidized Beds: A Review of Key Phenomena and Future Perspectives

Kwong

Marek

2021

Energy Fuels

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“…This facility and experimental setup were already used to study the pyrolysis of sewage sludge [51] and Cynara cardunculus L. [52], and to analyze the sublimation of dry ice [54].…”

Section: Pyrolysis Measurements In Fluidized Bedmentioning

confidence: 99%

Microalgae pyrolysis under isothermal and non-isothermal conditions

et al. 2020

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“…Further research explored the impact of dried ice particles formed into hard chunks on heat transfer within a fluidized bed [20]. Findings indicated enhanced ice particle mixing when fluid velocity was increased.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Temperature and Air Velocity Distribution in a Rectangular Cavity with Insulated Side Walls

Adeleye,

Oni,

Oluwaleye

2023

IJHT

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Heat transfer and fluid flow in cavities is often a result of convection. The study of convection in enclosures, such as rectangular cavities, under different parameters, holds significance in understanding the thermal-hydraulic characteristics, like temperature and air velocity distribution, in systems where heat transfer and fluid flow are involved. This research focuses on the numerical investigation of temperature and air velocity distribution in a rectangular cavity. COMSOL Multiphysics software was utilized to create a model of the cavity, subjecting it to regulated temperatures of 323.0 K, 333.0 K, and 343.0 K at operating times of 0, 300, 900, and 1,500 seconds. The cavity's bottom wall was heated by a heater, and the inner sides of the right and left walls were insulated using fiberglass. The findings from the research indicate that at an operating time of 900 seconds, the maximum air velocities recorded were 0.06, 0.06, 0.03, and 0.10 m/s at the left wall, right wall, bottom, and top of the cavity respectively. Beyond 900 seconds of operation, the air velocities remained constant. Furthermore, at 900 seconds of operation, the maximum isotherms at the regulated temperatures of 323.0 K, 333.0 K, and 343.0 K were approximately equal to their respective temperatures, but they precisely equaled the regulated temperatures at an operating time of 1,500 seconds. The results of this research can be applied to various areas that involve heat and fluid flow, including heat exchangers, building design for energy efficiency, solar systems, nuclear reactor operations, microelectronic component cooling, energy storage, heating devices, and refrigeration systems.

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Experimental evaluation of the convection heat transfer coefficient of large particles moving freely in a fluidized bed reactor

Cited by 17 publications

References 39 publications

Combustion of Biomass in Fluidized Beds: A Review of Key Phenomena and Future Perspectives

Combustion of Biomass in Fluidized Beds: A Review of Key Phenomena and Future Perspectives

Microalgae pyrolysis under isothermal and non-isothermal conditions

Numerical Investigation of Temperature and Air Velocity Distribution in a Rectangular Cavity with Insulated Side Walls

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