Journal ArticleDOI
Residence Time Distribution of Solids in a Fluidized Bed
M Prasad Babu,Y. Pydi Setty +1 more
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In this paper, a single-stage fluidized bed provided with an internal, using uniformly sized particles and a binary solid mixture, varying gas flow rate, solids rate, bed height, dilution and the bed geometry has been determined.Abstract:
Experimental investigation of RTD (residence time distribution) of solids is carried out in a single-stage fluidized bed provided with an internal, using uniformly sized particles and a binary solid mixture, varying gas flow rate, solids rate, bed height, dilution and the bed geometry. The effect of these variables on first and second moments as well as on F-curves has been determined. Using a binary solid mixture or an internal inside the bed is found to reduce backmixing of solids. The data is fitted to FTEM and the values of N obtained were compared for different variables.read more
Citations
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Reactor–Regenerator System for the Dimethyl Ether-to-Olefins Process over HZSM-5 Catalysts: Conceptual Development and Analysis of the Process Variables
TL;DR: The DME-to-olefins (DTOF) process is an interesting alternative to the methanol to OE process because of the easier production of DME, its higher reactivity, and the moderate d... as mentioned in this paper.
Journal ArticleDOI
Prediction of solids residence time distribution in cross-flow bubbling fluidized bed
TL;DR: A semi-empirical approach was developed and further validated, for the first time in the literature, to predict the entire profile of solids RTD, in which the ascending part was obtained through CFD simulation whereas the descending part was given by the fitted empirical exponential function.
Journal ArticleDOI
Hydrodynamic and solids residence time distribution in a binary bubbling fluidized bed: 3D computational study coupled with the structure-based drag model
TL;DR: In this paper, the simulation of bubbling fluidized beds (BFB) residence time distribution (RTD) based on the structure-based drag model is conducted for the single and binary gas-solid phases systems, a comparison of computed results with experimental data proves that their model is applicable to both systems with better accuracy.
Journal ArticleDOI
Multi-stage fluidized bed column: Hydrodynamic study
TL;DR: In this paper, the authors carried out mass transfer study on a multi-stage fluidized bed ion exchanger column with solids and liquid flowing in the counter current directions and demonstrated improved separation efficiency of dissolved anions from waste water.
Journal ArticleDOI
CFD simulation of solids residence time distribution in a multi-compartment fluidized bed
TL;DR: In this paper, a numerical investigation of the solids residence time distribution and the fluidized structure of a multi-compartment fluidized bed, in which the flow pattern is proved to be close to plug flow by using computational fluid dynamics (CFD) simulations.
References
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Journal ArticleDOI
Effects of operating conditions on longitudinal solids mixing in a circulating fluidized bed riser
TL;DR: In this article, longitudinal solids mixing was studied experimentally in circulating fluidized bed risers of internal diameter 0.152 m and 0.305 m. Superficial gas velocity and mean solids flux used were 2.8-5.0 m/s and 5.0-80 kg/m 2.s, respectively.
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Overall solids movement and solids residence time distribution in a CFB-riser
K Smolders,Jan Baeyens +1 more
TL;DR: In this article, a more fundamental approach based on the core/annulus flow structure is used to predict the residence time distribution of the solids, which is qualitatively well described, but experimental curves show a higher dispersion than the calculated ones.
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A generalization of the tanks-in-series mixing model
B.A. Buffham,L. G. Gibilaro +1 more
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Measuring and modelling residence time distribution of low density solids in a fluidized bed reactor of sand particles
TL;DR: In this article, an experimental study was carried out to estimate the residence time distribution of low density particles injected into a fluidized bed reactor containing sand particles, and the experimental results demonstrated that the degree of particle entrainment was a function of the fluidizing gas velocity, the particle size and the particle density.
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Residence time distribution functions for stirred tanks in series
R. L. Stokes,E.B. Nauman +1 more
TL;DR: Two noninteger extensions to the tanks-in-series model are discussed and methods for data reduction are presented and compared for a set of experimental measurements on a single stirred tank reactor.