Characterization of fluidized bed layer inversion in a 191-mm-diameter column using both experimental and CPFD approaches

2012 ◽  
Vol 80 ◽  
pp. 419-428 ◽  
Author(s):  
V. Vivacqua ◽  
S. Vashisth ◽  
G. Hébrard ◽  
J.R. Grace ◽  
N. Epstein
Keyword(s):  
Fluidized Bed

Influence of Seeding Conditions on Initial Biofilm Development during the Startup of Anaerobic Fluidized Bed Reactors

1989 ◽  
Vol 21 (4-5) ◽  
pp. 157-165 ◽  
Author(s):  
F. Ehlinger ◽  
J. M. Audic ◽  
G. M. Faup
Keyword(s):  
Fluidized Bed ◽  
Future Development ◽  
Protein Concentration ◽  
Specific Activity ◽  
Fluidized Bed Reactor ◽  
Fluidized Bed Reactors ◽  
Support Material ◽  
Biofilm Development ◽  
Initial Biofilm

The characterization of the biofilm of an anaerobic fluidized-bed reactor was completed under standard conditions. The distribution of the fixed protein concentration depended on the level in the reactor. The protein concentration reached 1520 µg.g−1 of support at the top of the reactor and only 1200 µg.g−1 at the bottom after 504 hours of operation but the specific activity of the biofilm was 33×10−4 µM acetate.h−1.mg−1 proteins at the bottom and only 26×10−4 µM.h−1.mg−1 at the top. The efficiency of a fluidized bed reactor and the composition of the biofilm changed with an increase of the pH from 7 to 8.5 during the seeding of the support material. Future development of the biofilm and the specific activity of the support were affected.

scholarly journals Thermal regeneration of waste foundry phenolic sand in a lab scale fluidized bed

2018 ◽  
Vol 23 (1) ◽  
Author(s):  
Johny Anderson Severo ◽  
Regina Célia Espinosa Modolo ◽  
Carlos Alberto Mendes Moraes ◽  
Flávia Schwarz Franceschini Zinani
Keyword(s):  
Fluidized Bed ◽  
Regeneration Process ◽  
Process Conditions ◽  
Loss On Ignition ◽  
Molding Process ◽  
Partial Removal ◽  
Thermal Regeneration ◽  
Previously Treated ◽  
Regeneration Efficiency

ABSTRACT Improper disposal of sand used in molding processes after casting increases logistical costs and environmental impact because of the presence of the phenolic resin in its composition. The regeneration process of waste foundry phenolic sand (WFPS) aims to recycle this material. As mechanical regeneration methods are not efficient to guarantee 100% cleaning of the sand grains and their use again in the molding process, this work investigated the efficiency of a method of thermal regeneration of this type of residue that can be employed as a complementary procedure. A laboratory-scale fluidized bed reactor was designed and built to regenerate WFPS that was previously treated by a mechanical method. The methodology used to design and construct the fluidized bed prototype is described, as well as the characterization of the residual, the standard clean sand and the regenerated sand. The results of the thermal regeneration in the fluidized bed were very satisfactory with respect to the regeneration efficiency. For the nine process conditions tested, loss on ignition values were reduced when compared to standard clean sand. This study presents the advantages of a combination of two processes, mechanical and thermal regeneration, which allows to reduce the time and eventual temperature of resin removal due to the partial removal of the resin layer or its weakening during the mechanical regeneration process. Of the nine process conditions tested, six had loss on ignition values below the CSS. Thus, the thermal regeneration in the fluidized bed results was quite satisfactory in relation to the regeneration efficiency.

scholarly journals Las degradation in a fluidized bed reactor and phylogenetic characterization of the biofilm

2013 ◽  
Vol 30 (3) ◽  
pp. 521-529 ◽  
Author(s):  
L. L. Oliveira ◽  
R. B. Costa ◽  
I. K. Sakamoto ◽  
I. C. S. Duarte ◽  
E. L. Silva ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Fluidized Bed Reactor ◽  
Phylogenetic Characterization

Characterization of pressure fluctuations from a gas–solid fluidized bed by structure density function analysis

2015 ◽  
Vol 129 ◽  
pp. 156-167 ◽  
Author(s):  
Yumin Chen ◽  
C. Jim Lim ◽  
John R. Grace ◽  
Junying Zhang ◽  
Yongchun Zhao ◽  
...  
Keyword(s):  
Density Function ◽  
Fluidized Bed ◽  
Function Analysis ◽  
Pressure Fluctuations ◽  
Structure Density

CHARACTERIZATION OF FLUIDIZED BED REACTORS WITH GAS TRACER MEASUREMENTS

1981 ◽  
Vol 10 (4-5) ◽  
pp. 307-330 ◽  
Author(s):  
D. WIPPERN ◽  
K. WITTMANN ◽  
J. KÜHNE ◽  
H. HELMRICH ◽  
K. SCHÜGERL
Keyword(s):  
Fluidized Bed ◽  
Fluidized Bed Reactors ◽  
Gas Tracer

scholarly journals Measurement and characterization of biomass mean residence time in an air-blown bubbling fluidized bed gasification reactor

Fuel ◽  
2019 ◽  
Vol 253 ◽  
pp. 1414-1423 ◽  
Author(s):  
Cornelius E. Agu ◽  
Christoph Pfeifer ◽  
Marianne Eikeland ◽  
Lars-Andre Tokheim ◽  
Britt M.E. Moldestad
Keyword(s):  
Fluidized Bed ◽  
Residence Time ◽  
Mean Residence Time ◽  
Bubbling Fluidized Bed
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