Experimental Study of Optimal Operation for a Honeycomb Adsorber Operated with Thermal Swing.

Kodama, Akio; Goto, Motonobu; Hirose, Tsutomu; Kuma, Toshimi

doi:10.1252/jcej.26.530

Cited by 71 publications

(35 citation statements)

References 11 publications

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“…[18,19]. The use of monoliths in adsorption process is rather new compared to its applications in the catalytic field [20][21][22]. The characteristic difference between adsorptive and catalytic monoliths stems from the need for sorption capacity in the former.…”

Section: Monolithic Adsorbentsmentioning

confidence: 99%

“…Early attempts in the use of monolithic adsorbent structures for separation process were mostly related to elimination of VOCs from air [21,23]. MAST carbon, a specialist developer of activated carbon produces a variety of activated carbon monoliths for a range of applications including (but not limited to) VOC removal.…”

Section: Monolithic Adsorbentsmentioning

confidence: 99%

“…These adsorbents are usually made by impregnation of ceramic papers and corrugating the sheets in order to create the honeycomb structure [21,[56][57][58][59][60]. In the study conducted by Kim et al [36] zeolite paper in the form of honeycomb rotors was employed in the removal of trace amount of VOCs.…”

Section: Monolithic Adsorbentsmentioning

confidence: 99%

See 2 more Smart Citations

Structured adsorbents in gas separation processes

Rezaei

Webley

2010

Separation and Purification Technology

230

209

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a b s t r a c tIn this review, novel structured adsorbents for gas separation processes are discussed. General requirements are elucidated and illustrated with respect to specific structures such as monoliths, foams, laminates, and fabric structures. Geometrical parameters of adsorbents which affect the system performance are identified and discussed. It is clear that opportunities for improvement and optimization of adsorptive gas separation processes should include the development of improved structured adsorbents. These novel structures can fulfil many of the requirements of advanced gas separation processes such as enhanced mass transfer, reduced pressure drop, and improved thermal management.

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Section: Monolithic Adsorbentsmentioning

confidence: 99%

Section: Monolithic Adsorbentsmentioning

confidence: 99%

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Structured adsorbents in gas separation processes

Rezaei

Webley

2010

Separation and Purification Technology

230

209

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“…Recently, various structured adsorbents with enhanced adsorption characteristics such as monolithic, laminate and foam structures have gained considerable attention as substitutes for traditional adsorbent particles (Kodama et al, 1993;Maurer, 1994;Gadkaree, 1997;Li et al, 1998;Golden et al, 2003;Brandani et al, 2004;Keefer et al, 2004;Sawad et al, 2005;Golden et al, 2005;Zabka et al, 2006;Grande et al, 2006;Rode et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Optimum structured adsorbents for gas separation processes

Rezaei¹,

Webley²

2009

Chemical Engineering Science

163

146

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Recent developments in separation technology by adsorption have included the development of new structured adsorbents which offer some attractive characteristics compared to a typical packed bed. These improved features include lower energy consumption, higher throughput and superior recovery and purity of product. However, the exact combination of structural, geometric parameters which yields optimum performance is unknown. This study formulates a methodology for comparison based on a variety of analytical and numerical models and uses it to examine the performance of different adsorbent configurations. In particular, monolithic, laminate and foam structures are evaluated and compared to a packed bed of pellets. The effects of physical adsorbent parameters which govern the performance of a PSA process are considered during model development. Comparisons are carried out based on mass transfer kinetics, adsorbent loading and pressure drop of a PSA system for CO 2 /N 2 separation. The results indicated that structured adsorbents can provide superior throughput to packed beds provided their geometrical parameters exceed certain values. For example, laminate structures can offer superior performance to a packed bed of pellets only if the critical sheet thickness and spacing are less than about 0.2 mm. Each adsorbent structure should be designed to operate at its "optimal" velocity. When operating at velocities higher than the "optimal" value, the increase in pressure drop and length of the mass transfer zone more than offsets gains accrued through reduction in cycle time.

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“…The convection mass transfer can be estimated through the Sherwood number, this one being given by the analogy between heat and mass transfer characterized by Le ≈ 1. The experimental work on desiccant devices such as desiccant wheels has been focused on the validation of physical prediction models [8,[37][38][39][40], the development of simplified models based on experimental data correlations [40][41][42] and the performance characterization by carrying out numerous experiments under various operating conditions [43,44].…”

Section: Introductionmentioning

confidence: 99%

On the validity of lumped capacitance approaches for the numerical prediction of heat and mass transfer in desiccant airflow systems

Ruivo

Costa

Figueiredo

2008

International Journal of Thermal Sciences

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In the present work, a detailed model of simultaneous heat and mass transfer through a desiccant micro-porous medium of a channel wall of compact heat and mass exchangers, such as desiccant wheels, was developed. The relevant phenomena considered by this model within the porous medium are surface diffusion of the adsorbed water, Knudsen diffusion of water vapour, heat conduction and the sorption process. A onedimensional formulation of this model is used to investigate the validity of two simplifying approaches based on the lumped-capacitance method. One consists of neglecting the transversal heat and mass transfer resistances within the porous medium, the other of cancelling only the thermal resistance.Results are presented for a wide range of values of the layer thickness of the porous medium. It is concluded that the hypothesis of nullresistances in the cross direction is valid only for layer thicknesses lower than 0.1 mm, approximately, while the approach based on the thermal lumped capacitance model is valid for layer thicknesses lower than 5 mm. Finally, a dimensional analysis of interfacial balances leads to the conclusion that the Biot number for surface diffusion is several orders of magnitude higher than the corresponding thermal Biot number.

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Experimental Study of Optimal Operation for a Honeycomb Adsorber Operated with Thermal Swing.

Cited by 71 publications

References 11 publications

Structured adsorbents in gas separation processes

Structured adsorbents in gas separation processes

Optimum structured adsorbents for gas separation processes

On the validity of lumped capacitance approaches for the numerical prediction of heat and mass transfer in desiccant airflow systems

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