Characterization of Precipitated Carbon by XPS and Its Prevention Mechanism of Sticking during Reduction of Fe2O3 Particles in the Fluidized Bed

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.

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Characterization of nonlinear dynamics in a circulating fluidized bed by rescaled range analysis and short-term predictability analysis

Chemical Engineering Science ◽

10.1016/s0009-2509(01)00299-8 ◽

2001 ◽

Vol 56 (23) ◽

pp. 6545-6552 ◽

Cited By ~ 17

Author(s):

Ryuji Kikuchi ◽

Atsushi Tsutsumi

Keyword(s):

Nonlinear Dynamics ◽

Fluidized Bed ◽

Circulating Fluidized Bed ◽

Range Analysis ◽

Short Term ◽

Rescaled Range ◽

Rescaled Range Analysis ◽

Predictability Analysis

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

Chemical Engineering Science ◽

10.1016/j.ces.2012.06.042 ◽

2012 ◽

Vol 80 ◽

pp. 419-428 ◽

Cited By ~ 25

Author(s):

V. Vivacqua ◽

S. Vashisth ◽

G. Hébrard ◽

J.R. Grace ◽

N. Epstein

Keyword(s):

Fluidized Bed

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

Matéria (Rio de Janeiro) ◽

10.1590/s1517-707620170001.0319 ◽

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.

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