scholarly journals Studies on the Fluidized Bed Electrode

2008 ◽  
Vol 6 (1) ◽  
Author(s):  
Siva Kumar ◽  
Thilakavathi Ramamurthy ◽  
Bala Subramanian ◽  
Ahmed Basha
Keyword(s):  
Fluidized Bed ◽  
Annular Flow ◽  
Flow Model ◽  
Model Simulation ◽  
Flow Behavior ◽  
Hydrodynamic Characteristics ◽  
The Core ◽  
Particle Transfer ◽  
Fluidized Bed Electrode

The present investigation attempts to study the hydrodynamic characteristics of the fluidized bed electrode. A core-annular flow model with a transfer of particles between core-annular layers has been proposed to describe the flow behavior of conducting particles in the fluidized bed electrode. The effect of individual parameters on the rate of the particle transfer across the layer and thickness of the core-annular has been critically examined and the model simulation has been verified with the data reported in the literature.

Hydrodynamic Characteristics in a Cold Flow Model of Quadruple Fluidized Bed Gasifier

2020 ◽  
Vol 59 (10) ◽  
pp. 4775-4784
Author(s):  
Jie Ren ◽  
Ziliang Wang ◽  
Boshu He ◽  
Linbo Yan ◽  
Ziqi Wang ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Flow Model ◽  
Hydrodynamic Characteristics ◽  
Cold Flow ◽  
Fluidized Bed Gasifier

Upward Vertical Two-Phase Flow Through an Annulus—Part II: Modeling Bubble, Slug, and Annular Flow

1992 ◽  
Vol 114 (1) ◽  
pp. 14-30 ◽  
Author(s):  
E. F. Caetano ◽  
O. Shoham ◽  
J. P. Brill
Keyword(s):  
Flow Pattern ◽  
Annular Flow ◽  
Two Phase Flow ◽  
Flow Behavior ◽  
Bubble Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Flow Through ◽  
Physical Phenomena ◽  
Good Agreement

Mechanistic models have been developed for each of the existing two-phase flow patterns in an annulus, namely bubble flow, dispersed bubble flow, slug flow, and annular flow. These models are based on two-phase flow physical phenomena and incorporate annulus characteristics such as casing and tubing diameters and degree of eccentricity. The models also apply the new predictive means for friction factor and Taylor bubble rise velocity presented in Part I. Given a set of flow conditions, the existing flow pattern in the system can be predicted. The developed models are applied next for predicting the flow behavior, including the average volumetric liquid holdup and the average total pressure gradient for the existing flow pattern. In general, good agreement was observed between the experimental data and model predictions.

scholarly journals CPFD simulation of a dual fluidized bed cold flow model

2021 ◽  
Vol 11 (1) ◽  
pp. 189-203
Author(s):  
A. Lunzer ◽  
S. Kraft ◽  
S. Müller ◽  
H. Hofbauer
Keyword(s):  
Fluidized Bed ◽  
Flow Model ◽  
Cold Flow ◽  
Dual Fluidized Bed

Hydrodynamic characteristics of the dense medium gas–solid fluidized bed for coal beneficiation and cleaning

2015 ◽  
Vol 34 (2) ◽  
pp. 173-183 ◽  
Author(s):  
Jingfeng He ◽  
Yuemin Zhao ◽  
Yaqun He ◽  
Zhenfu Luo ◽  
Hong Li ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Dense Medium ◽  
Hydrodynamic Characteristics ◽  
Coal Beneficiation

Design and Simulation of a Hybrid Entrained-Flow and Fluidized Bed Mild Gasifier: Part 2—Case Study and Analysis

2011 ◽  
Author(s):  
A. K. M. Monayem Mazumder ◽  
Ting Wang ◽  
Jobaidur R. Khan
Keyword(s):  
Multiphase Flow ◽  
Fluidized Bed ◽  
Flow Behavior ◽  
Flame Temperature ◽  
Heterogeneous Reactions ◽  
Thermal Flow ◽  
Entrained Flow ◽  
Progressive Development ◽  
Gasification Process ◽  
Flow And Heat Transfer

To help design a mild-gasifier, a reactive multiphase flow computational model has been developed in Part 1 using Eulerian-Eulerian method to investigate the thermal-flow and gasification process inside a conceptual, hybrid entrained-flow and fluidized-bed mild-gasifier. In Part 2, the results of the verifications and the progressive development from simple conditions without particles and reactions to complicated conditions with full reactive multiphase flow are presented. Development of the model starts from simulating single-phase turbulent flow and heat transfer in order to understand the thermal-flow behavior, followed by introducing seven global, homogeneous gasification reactions progressively added one equation at a time. Finally, the particles are introduced, and heterogeneous reactions are added in a granular flow field. The mass-weighted, adiabatic flame temperature is validated through theoretical calculation and the minimum fluidization velocity is found to be close to Ergun’s correlation. Furthermore, the predicted exit species composition is consistent with the equilibrium values.

Simulation of a fluidized bed electrode direct carbon fuel cell

2015 ◽  
Vol 40 (8) ◽  
pp. 3321-3331 ◽  
Author(s):  
Jubing Zhang ◽  
Xiaoxiang Jiang ◽  
Guilin Piao ◽  
Hongmin Yang ◽  
Zhaoping Zhong
Keyword(s):  
Fuel Cell ◽  
Fluidized Bed ◽  
Direct Carbon Fuel Cell ◽  
Fluidized Bed Electrode

Hydrodynamic characteristics of bubble-induced three-phase inverse fluidized bed (BIFB)

2019 ◽  
Vol 209 ◽  
pp. 115177 ◽  
Author(s):  
Keying Ma ◽  
Xiliang Sun ◽  
Yuanyuan Shao ◽  
Mingyan Liu ◽  
Jesse Zhu
Keyword(s):  
Fluidized Bed ◽  
Hydrodynamic Characteristics ◽  
Three Phase ◽  
Inverse Fluidized Bed

Contribution of hydrodynamic characteristics on the performance of an aerobic biofilm conical fluidized bed

2011 ◽  
Vol 63 (6) ◽  
pp. 1160-1167 ◽  
Author(s):  
D. Zhou ◽  
X. T. Bi ◽  
S. Dong
Keyword(s):  
Fluidized Bed ◽  
Microbial Population ◽  
Expansion Ratio ◽  
Hydrodynamic Characteristics ◽  
Internal Circulation ◽  
Axial Distribution ◽  
Biofilm Thickness ◽  
Cell Matrix ◽  
Bed Expansion ◽  
Conical Fluidized Bed

The performance of a conical fluidized bed (TFB) bioreactor, including the biofilm thickness, microbial space density, microbial cell matrix and its efficiency for COD degradation at a bed expansion ratio of 14 to 90%, was studied and compared with a cylindrical fluidized bed (CFB) bioreactor. The hydrodynamic characteristics of the TFB, especially the internal-circulation of bioparticles associated with its unique tapered geometry of the bed, created a much more uniform axial distribution of the bioparticles, leading to the formation of thinner and more compacted biofilms in the TFB compared to that in the CFB. The thinner biofilm in the TFB tended to be stable and possessed more than 6 times of microbial population density compared to the CFB. As a result, thinner biofilms in the TFB contributed to a higher COD removal efficiency, which remained at over 95% at operated expansion ratios, about 15 to 25% higher than that in the CFB.

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