Bed Expansion Characteristics of Liquid-Solid Fluidized Bed with Internals

Ramaswamy, E.; Srinivasakannan, C.; Balasubramaniam, N.

doi:10.5539/mas.v2n2p84

Cited by 2 publications

(3 citation statements)

References 8 publications

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“…It was found that as the dosage of adsorbent was increased, the percentage of residual oil removal also increased, as shown in Fig. (6). Adsorption is a surface related phenomenon, at equilibrium most of the oil molecules were adsorbed on the surface and in the intermolecular pores of the adsorbent.…”

Section: Effect Of Adsorbent Loadingmentioning

confidence: 89%

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Oily Wastewater Treatment Using Expanded Beds of Activated Carbon and Zeolite

Mohammed¹,

Faisal²,

Alwan³

2011

IJCPE

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Two types of adsorbents were used to treat oily wastewater, activated carbon and zeolite. The removal efficiencies of these materials were compared to each other. The results showed that activated carbon performed some better properties in removal of oil. The experimental methods which were employed in this investigation included batch and column studies. The former was used to evaluate the rate and equilibrium of carbon and zeolie adsorption, while the latter was used to determine treatment efficiencies and performance characteristics. Expanded bed adsorber was constructed in the column studies. In this study, the adsorption behavior of vegetable oil (corn oil) onto activated carbon and zeolite was examined as a function of the concentration of the adsorbate, contact time, adsorbent dosage and amount of coagulant salt(calcium sulphate) added . The adsorption data was modeled with Freundlich and Langmuir adsorption isotherms. and it was found that the adsorption process on activated carbon and zeolite fit the Freundlich isotherm model. The amount of oil adsorbed increased with increasing the contact time, but longer mixing duration did not increase residual oil removal from wastewater due to the coverage of the adsorbent surface with oil molecules. It was found that as the dosage of adsorbent increased, the percentage of residual oil removal also increased. The effects of adsorbent type and amount of coagulant salt(calcium sulphate) added on the breakthrough curve were studied in details in the column studies. Expanded bed behavior was modeled using the Richardson-Zaki correlation between the superficial velocity of the feed stream and the void fraction of the bed at moderate Reynolds number.

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Section: Effect Of Adsorbent Loadingmentioning

confidence: 89%

“…The effluents from the bed were analyzed for oil content at chosen intervals of time until breakthrough occurs. The minimum fluidized velocity for particles (V mf ) had been estimated to be (1.4 10 -3 m/s) for activated particles and (2.1 10 -4 m/s) for zeolite using the following equation [6]:…”

Section: Column Studiesmentioning

confidence: 99%

Oily Wastewater Treatment Using Expanded Beds of Activated Carbon and Zeolite

Mohammed¹,

Faisal²,

Alwan³

2011

IJCPE

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“…The particles are primarily fluidized by liquid [9]. Bed expansion ratio βer Measure the extent of fluidization of the bed [10]. Gas holdup Ԑg Measure the Gas occupied fractional volume [11].…”

Section: Umfmentioning

confidence: 99%

Recent Development in Hydrodynamic and Heat Transfer Characteristics in the Three-phase Fluidized-bed System

Mahdy¹,

Abdulrahmn²,

Ali³

2022

ETJ

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The effect of several characteristics on hydrodynamic performance and heat transfer phenomena has been studied extensively.  A review of most of the previous correlations for various parameters in gas-liquid-solid fluidization systems was investigated. CFD could be used to understand the complicated hydrodynamics of fluidization Gas-liquid-solid fluidized beds are broadly utilized in the petrochemical, pharmaceutical, refining, food, biotechnology, and environmental industries. Due to complex phenomena, such as the particle-particle, liquid-particle, particlebubble interactions, complex hydrodynamics, and heat transfer of three-phase (gas-liquid-solid) fluidized beds, they are incompletely understood. The ability to accurately predict the essential characteristics of the fluidized-bed system, such as hydrodynamics, individual phase mixing, and heat transfer parameters, is necessary for its successful design and operation. This paper investigates the pressure drop, minimum fluidization velocity, phase holdup, heat-transfer coefficient of a fluidized bed reactor, heat transfer studies, CFD simulation, and the effect of these parameters on the extent of fluidization. Many variables (fluid flow rate, particle density and size, fluid inlet, and bed height) affect the fluidizing quality and performance of the fluidization process. The hydrodynamics parameters, mixing of phases, and the behavior of heat transfer with various modes of fluidization were investigated to predict hydrodynamics parameters. Several publications have demonstrated the utility of (CFD) in explaining the hydrodynamics, heat, and mass transfer of fluidized beds. Principles of measurement, details of the experimental configurations, and the applied techniques by various researchers are also presented. Feng's model was statistically validated using experimental data that was both time-averaged and time-dependent. Furthermore, this model successfully predicted the instantaneous flow structures, which should provide strategies for the best design, scale-up, and operation in fluidized bed columns. The divergence between the simulated and observed values can be reduced by better understanding the fluidized bed's nature.

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Bed Expansion Characteristics of Liquid-Solid Fluidized Bed with Internals

Cited by 2 publications

References 8 publications

Oily Wastewater Treatment Using Expanded Beds of Activated Carbon and Zeolite

Oily Wastewater Treatment Using Expanded Beds of Activated Carbon and Zeolite

Recent Development in Hydrodynamic and Heat Transfer Characteristics in the Three-phase Fluidized-bed System

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