A study of gas-phase axial mixing in a packed absorption tower PDF Download
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Author: Edward Thomas Woodburn
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Edward Thomas Woodburn
Publisher:
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Category :
Languages : en
Pages :
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Author: Betty Ann Cooper
Publisher:
ISBN:
Category :
Languages : en
Pages : 284
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Author: Virendra Kumar Mathur
Publisher:
ISBN:
Category : Axial flow
Languages : en
Pages : 340
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"A steady state approach was followed in this investigation to determine the effects of liquid and gas flow rates, packing size and packing height on the interphase mass transfer coefficient and gas phase axial mixing Peclet numbers. Experiments were performed on the absorption of carbon dioxide from a mixture of carbon dioxide and nitrogen in a packed column. Absorption was performed using 1/4, 3/8 and l/2 inch Raschig rings, with a packing height of 3 feet and also using 3/8 inch Raschig rings with a packing height of 5 feet. The liquid and gas flow ranges used were 2865 to 5680 lb./hr.sq.ft. and 5.0 to 7.4 lb./hr.sq.ft., respectively. Three mathematical models, viz. (i) plug flow in both the gas and liquid phases, (ii) axial mixing in gas phase and plug flow in liquid phase, and (iii) axial mixing in both gas and liquid phases, were used. It is found that axial mixing in the gas phase increases with increases in liquid flow rate, packing size and packing height. The behavior of apparent and true mass transfer coefficients indicates a decrease in axial mixing with increases in gas flow rates. However, axial mixing is found to be small under the experimental conditions used in this investigation. The gas phase Peclet numbers obtained in this investigation are about fifty times greater than reported by workers using a transient technique under the same conditions. Correlations for the apparent and true over-all liquid phase mass transfer coefficients are also presented"--Abstract, leaf ii.
Author: Sundareswaran Parameswaran Iyer
Publisher:
ISBN:
Category : Axial flow
Languages : en
Pages : 196
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"The effect of axial mixing in the liquid phase on the performance of a gas absorption column was studied using the experimental data of Michael Brittan for the carbon dioxide and water system. In this study, piston flow conditions were assumed for the gas phase. A one-parameter mathematical model, which characterized the flow regimes in both the gas and the liquid phases undergoing plug flow conditions, was first curve fitted for its unknown parameter (i.e. the Number of Transfer Units) by a non-linear regression analysis procedure. The "AAPD" (i.e. the Average Absolute Percentage Deviation between the predicted value of the gas phase concentration and the experimental data) was also computed for each set of data. An attempt was made to curve-fit a two-parameter mathematical model, which assumed plug flow in the gas phase but axial mixing in the water phase, by a similar non-linear regression analysis procedure. However, in the iterative technique used, the values of the unknown parameters (i.e., the water phase axial mixing parameter and the number of transfer units) failed to converge. As an alternate to this procedure a graphical method was used to study the effect of the axial mixing parameter on the value of the "AAPD". The results obtained from the analysis of the two mathematical models were examined. A comparison showed that the "AAPD" computed for both the models were very close; hence, it was concluded that the effect of axial mixing in the water phase, for the nitrogen carbon dioxide-water system based on the data obtained by Brittan and Woodburn(2) has little influence on the gas-absorption column--Abstract, leaves iv-v.
Author: William E. Dunn
Publisher:
ISBN:
Category : Dispersion
Languages : en
Pages : 78
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Author: Nikolai Kolev
Publisher: Elsevier
ISBN: 0080463924
Category : Technology & Engineering
Languages : en
Pages : 709
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Packed bed columns are largely employed for absorption, desorption, rectification and direct heat transfer processes in chemical and food industry, environmental protection and also processes in thermal power stations like water purification, flue gas heat utilization and SO2 removal. These Separation processes, are estimated to account for 40%-70% of capital and operating costs in process industry. Packed bed columns are widely employed in this area. Their usage also for direct heat transfer between gas and liquid, enlarge their importance. They are the best apparatuses, from thermodynamical point of view, for mass and heat transfer processes between gas and liquid phase. Their wide spreading is due to low capital investments and operating costs. Since 1995 there has not been published a specialised book in this area, and this is a period of quick development of packed columns. Packed Bed Columns reflects the state of this field including the author's experience on creating and investigating of new packings, column internals and industrial columns. - Considers the theories of mass transfer processes and shows how they help the construction of highly effective packings - Complete information about the performance characteristics of different modern types of highly effective packings - Considers the models for calculation and areas of their application
Author: Richard Noel Houlihan
Publisher:
ISBN:
Category : Distillation apparatus
Languages : en
Pages : 704
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Author: Jong Soo Cho
Publisher:
ISBN:
Category : Gases
Languages : en
Pages : 190
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The surface renewal rate from Danckwerts' theory and the effective interfacial area between gas and liquid per unit packing volume in a packed absorption tower were evaluated for the absorption of carbon dioxide into carbonate/bicarbonate buffer solution accompanied by a pseudo-first order chemical reaction. The rate of chemical reaction in the liquid phase was controlled by varying the buffer ratios. A small absorption tower was constructed, which had a packing section, 30 cm high with 10.2 cm inside diameter. Two kinds of packing, 1/2-inch Rasehig ring for one part of the experiment and 1/2 inch Ben saddle for the other part of the experiment, were used in the investigation. Sodium carbonate/bicarbonate buffer solutions, with buffer ratios varying from 0.4 to 3.0, were used. Glycerine-water solutions were also used to investigate the effect of density and viscosity on the physical absorption of carbon dioxide; the content of glycerine varied from 0 to 40 % wt. Pure carbon dioxide was used to eliminate the gas side resistance in the mass transfer operation. The results of this investigation suggested the following conclusions: The surface renewal rate, s, and the effective interfacial area per unit packing volume, a, for each packing can be expressed as functions of Reynolds Number of the liquid flow. The comparison of values from this study with those of Danckwerts showed discrepancies; these discrepancies could be due to different flow patterns, packing densities, and the apparently more uniform distribution of liquid over the packing. The mass transfer coefficient for physical absorption into glycerine solution was expressed as a function of Reynolds number and Schmidt number. The mass transfer coefficient calculated from Danckwerts' model equation, kL*a = [Ds divided by a*] for absorption of carbon dioxide into water seemed to be larger than those measured in this experiment.
Author: Raymond Cecil Everson
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: David B. Kellermann
Publisher:
ISBN:
Category :
Languages : en
Pages : 122
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