Bed expansion in a mobile‐bed contactor

Tichý, J; Douglas, W. J. M.

doi:10.1002/cjce.5450500604

Cited by 17 publications

(13 citation statements)

References 5 publications

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“…Tichy and Douglas investigated variations of minimum fluidisation velocity in TBCs, and developed the empirical model given below to predict U mf in TBCs both for type I and type II operation:

U_{mf} = \frac{1}{ρ_{normalg}} (0.36355 + 57.9 d_{normalP} - 1.848 {G_{normalL}}^{0.6} {d_{normalP}}^{0.5})

…”

Section: Resultsmentioning

confidence: 99%

“…Most correlations omit the gas density since it is negligible with respect to that of the solid. Some of the studies conducted on TBC behaviour have reported pressure drop independence on gas velocity and packing size, whereas others claimed a pressure drop variation with the packing size. However, for small grid open areas, the pressure drop is reported to increase with gas velocity .…”

Section: Theoretical Background Of Tbcmentioning

confidence: 99%

“…Similar variation trends were observed for a bead diameter of 20 mm. [10] Tichy and Douglas [16] investigated variations of minimum fluidisation velocity in TBCs, and developed the empirical model given below to predict U mf in TBCs both for type I and type II operation:…”

Section: Minimum Fluidisation Velocitymentioning

confidence: 99%

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Hydrodynamics of turbulent bed contactor with non‐Newtonian liquids: Net pressure drop and minimum fluidisation velocity (part 2)

Abukhalifeh¹,

Fayed

Bhagat

et al. 2013

Can J Chem Eng

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The study investigates the hydrodynamic behaviour of non‐Newtonian liquids under different operating conditions in a turbulent bed contactor (TBC). Hollow plastic spheres were fluidised in an air stream flowing counter currently to an aqueous solution of carboxy methyl cellulose (CMC) of an apparent viscosity ranging from 5 to 25 mPa s. A set of experiments was carried out to investigate the net pressure drop and minimum fluidisation velocity of the process. The column was operated at different superficial gas velocities, liquid flow rates, CMC solution concentrations and static bed heights. Results show that the net pressure drop is independent of the superficial gas velocity, but it increases steadily with liquid flow rate and static bed height. However, it remains almost invariant with a relatively low CMC concentration (0.2–0.4 wt%), and it augments gradually as the CMC percent exceeds the threshold of 0.4 wt% which corresponds to a more viscous liquid solution. The minimum fluidisation velocity decreases with a CMC concentration lower than 0.5 wt% approximately, but increases as the CMC percent exceeds 0.5 wt%. The study presents a new insight on the behaviour of non‐Newtonian solutions in TBC columns.

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“…Tichy and Douglas investigated variations of minimum fluidisation velocity in TBCs, and developed the empirical model given below to predict U mf in TBCs both for type I and type II operation:

U_{mf} = \frac{1}{ρ_{normalg}} (0.36355 + 57.9 d_{normalP} - 1.848 {G_{normalL}}^{0.6} {d_{normalP}}^{0.5})

…”

Section: Resultsmentioning

confidence: 99%

Section: Theoretical Background Of Tbcmentioning

confidence: 99%

See 1 more Smart Citation

Hydrodynamics of turbulent bed contactor with non‐Newtonian liquids: Net pressure drop and minimum fluidisation velocity (part 2)

Abukhalifeh¹,

Fayed

Bhagat

et al. 2013

Can J Chem Eng

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“…Results similar to this on bed expansion have been reported by Chen and Douglas (1969) (1972), and Soundarajan (1995). The experimental data of Tichy and Douglas (1972), Rama et al (1983) and Soundarajan (1995) are compared with model predictions in Fig. 4 (inset).…”

Section: Bed Expansionmentioning

confidence: 98%

Modelling of hydrodynamics in a type I turbulent bed contactor

Bruce

Raman

Sai

et al. 2006

Chemical Engineering Science

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“…Preliminary studies on this device were carried out by Douglas and coworkers [5][6][7][8]. O'Neill [9] observed two operating conditions for a TCA; fluidization with preliminary flooding and fluidization without preliminary flooding.…”

Section: Introductionmentioning

confidence: 99%

Mathematical Modeling, Simulation, and Experimental Verification of CO2 Removal in a Turbulent Contact Absorber

Zahedi

Jahanmiri

Elkamel

et al. 2006

Chem. Eng. Technol.

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A highly efficient technique of contaminant gas reduction, Turbulent Contact Absorber (TCA), is applied to CO 2 removal from a typical flue gas. Aqueous K 2 CO 3 sorbent was evaluated as a regenerable sorbent for CO 2 from the flue gas. In order to identify the system, momentum and mass balance equations were written for the TCA tower. A flat plate falling film model was employed to simulate the TCA tower and the effect of turbulence was included in mass and momentum transfer coefficients. To check the accuracy of the model, a pilot scale TCA was built and operated. A Testo type gas analyzer was used to detect gas concentrations at the inlet and outlet of the rig. The model was validated successfully with pilot plant data. The effect of velocity and K 2 CO 3 concentration on the TCA performance has also been carried out. It was found that the bed pressure drop increases linearly with gas velocity and then remains constant. An increase in the liquid flow rate increases liquid holdup, which leads to a rise in bed pressure drop. Higher turbulence within the TCA causes a velocity peak to shift from hypothetical gas-liquid interface towards the falling film plate. An increase of the K 2 CO 3 concentration from 1.0 g mol/L to 2.0 g mol/L was found to give an increase in CO 2 removal by about 4 %.

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Bed expansion in a mobile‐bed contactor

Cited by 17 publications

References 5 publications

Hydrodynamics of turbulent bed contactor with non‐Newtonian liquids: Net pressure drop and minimum fluidisation velocity (part 2)

Hydrodynamics of turbulent bed contactor with non‐Newtonian liquids: Net pressure drop and minimum fluidisation velocity (part 2)

Modelling of hydrodynamics in a type I turbulent bed contactor

Mathematical Modeling, Simulation, and Experimental Verification of CO2 Removal in a Turbulent Contact Absorber

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