Simulation of mass transfer in downer fluidized beds with a structure-based consideration

2019 ◽  
Vol 210 ◽  
pp. 115235 ◽  
Author(s):  
Dong Yan ◽  
Hongzhong Li ◽  
Chaoquan Hu ◽  
Qingshan Zhu ◽  
Zhaohui Xie
Keyword(s):  
Mass Transfer ◽  
Fluidized Beds

Structure-dependent multi-fluid model for mass transfer and reactions in gas–solid fluidized beds

2015 ◽  
Vol 122 ◽  
pp. 114-129 ◽  
Author(s):  
Cenfan Liu ◽  
Wei Wang ◽  
Nan Zhang ◽  
Jinghai Li
Keyword(s):  
Mass Transfer ◽  
Fluidized Beds ◽  
Fluid Model

Magnetically Stabilized and Fluidized Beds: Heat and Mass Transfer

2008 ◽  
Vol 273-276 ◽  
pp. 46-51 ◽  
Author(s):  
Paulo A. Augusto ◽  
Teresa Castelo-Grande ◽  
Angel M. Estévez ◽  
Domingos Barbosa ◽  
Jesus M. Rodriguez ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Fluidized Beds ◽  
Environmental Issues ◽  
Biological Materials ◽  
Theoretical Background ◽  
Main Attention

Research and applications of magnetically stabilized and fluidized beds begun several decades ago, and have maintained their rate of interest during all these years. During last years their applications was diversified, and the application of these beds in the processing of biological materials and in environmental issues has nowadays focused the main attention within this area. In this work we present a brief review of magnetically fluidized and stabilized beds, mainly concerning their theoretical background, heat and mass transfer topics, some industrial and laboratorial setups and applications.

Oxygen mass transfer in three-phase fluidized beds working at large flow rates

1983 ◽  
Vol 61 (1) ◽  
pp. 58-63 ◽  
Author(s):  
M. Alvarez-Cuenca ◽  
C. G. J. Baker ◽  
M. A. Bergougnou ◽  
M. A. Nerenberg
Keyword(s):  
Mass Transfer ◽  
Fluidized Beds ◽  
Oxygen Mass Transfer ◽  
Flow Rates ◽  
Three Phase ◽  
Large Flow

Mass transfer under segregation conditions in fluidized beds

Fuel ◽  
2017 ◽  
Vol 195 ◽  
pp. 105-112 ◽  
Author(s):  
Ke Qin ◽  
Henrik Thunman ◽  
Bo Leckner
Keyword(s):  
Mass Transfer ◽  
Fluidized Beds

scholarly journals Increasing Gas–Solids Mass Transfer in Fluidized Beds by Application of Confined Fluidization—A Feasibility Study

2019 ◽  
Vol 9 (4) ◽  
pp. 634 ◽  
Author(s):  
Jesper Aronsson ◽  
David Pallarès ◽  
Magnus Rydén ◽  
Anders Lyngfelt
Keyword(s):  
Mass Transfer ◽  
Fluidized Bed ◽  
Fluidized Beds ◽  
Cross Flow ◽  
Active Role ◽  
High Density ◽  
Low Density ◽  
Olivine Sand ◽  
Bed Material ◽  
Utility Scale

Fluidized bed applications where the bed material plays an active role in chemical reactions, e.g. chemical looping combustion, have seen an increase in interest over the past decade. When these processes are to be scaled up to industrial or utility scale mass transfer between the gas and solids phases can become a limitation for conversion. Confined fluidized beds were conceptualized for other purposes in the 1960’s but are yet to be applied to these recent technologies. Here it is investigated if they can prove useful to increase mass transfer but also if they are feasible from other perspectives such as pressure drop increase and solids throughflow. Four spherical packing solids, 6.35–25.4 mm in diameter at two different densities, were tested. For mass transfer experiments the fluidizing air was humidified and the water adsorption rate onto silica gel particles acting as fluidizing solids was measured. Olivine sand was used in further experiments measuring segregation of solids and packing, and maximum vertical crossflow of solids. It was found that mass transfer increased by a factor of 1.9–3.8 with packing solids as compared to a non-packed reference. With high-density packing, fluidizing solids voidage inside the packing was found to be up to 58% higher than in a conventional fluidized bed. Low density packing material favoured its flotsam segregation and with it higher fluidization velocities yield better mixing between packing and fluidizing solids. Maximum vertical cross-flow was found to be significantly higher with low density packing that fluidized, than with stationary high-density packing. Conclusively, the prospect of using confined fluidized beds for improving mass transfer looks promising from both performance and practical standpoints.

Mass transfer in fixed and fluidized beds

1985 ◽  
Vol 40 (9) ◽  
pp. 1783-1785 ◽  
Author(s):  
K. Rahman ◽  
M. Streat
Keyword(s):  
Mass Transfer ◽  
Fluidized Beds
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