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4 results on '"TRICKLE bed reactors"'

1. Liquid flow distribution in trickle bed reactors containing trilobed extrusions packed using different techniques

Author

Aashna Suneja and Shantanu Roy

Subjects
Trickle bed reactors, Liquid maldistribution, Trilobes, Bed packing methods, Two phase pressure drop, Technology
Abstract

The performance of the Trickle Bed Reactor (TBR) critically depends on the gas-liquid flow distribution in the reactor, which in turn depends on the catalyst shape, size, and structure. Extensive research has been carried out with spherical particles (catalyst),whereas industrially more complex-shaped particles (Cylindrical, Trilobe, and Quadrilobe) are used. Little work has been reported for the liquid distribution in packed beds employing these shapes.In this work, the liquid distribution was investigated in a cylindrical column of internal diameter 100 mm, containing particles of diameter 1.3 mm trilobed extrusions and length 1.8–8.8 mm. The influence of different loading methods - Central single source, solid cone, and hollow cone, gas and liquid flow rates, variation along the height of the column were studied. Air-water system was used. Pressure drop was measured with the help of a manometer and Maldistribution index (Mf) was calculated based on the variation of quantity of water collected at column outlet.It was observed that the Mf decreased with the increase in both the gas and liquid flow rate which was due to better spreading of the fluids with the increasing gas and liquid flow rate. The decrease in the Mf with the increasing gas and liquid flow rate indicates better distribution as reported in the literature 0 (best distribution) and 1 (worst distribution). Further, it was also noted that the pressure drop increased with the increasing gas and liquid flow rate. The hollow cone packing method shows the better distribution confirmed from the bulk voidage, Mf profiles, pressure drop variation, and flow profiles. A correlation has been proposed for the two-phase pressure drop for three packing methods.

Published
2023
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2. Trickle Bed Reactors : Reactor Engineering and Applications

Author

Vivek V. Ranade, Raghunath Chaudhari, Prashant R. Gunjal, Vivek V. Ranade, Raghunath Chaudhari, and Prashant R. Gunjal

Subjects
Trickle bed reactors
Abstract

This book provides a hybrid methodology for engineering of trickle bed reactors by integrating conventional reaction engineering models with state-of-the-art computational flow models. The content may be used in several ways and at various stages in the engineering process: it may be used as a basic resource for making appropriate reactor engineering decisions in practice; as study material for a course on reactor design, operation, or optimization of trickle bed reactors; or in solving practical reactor engineering problems. The authors assume some background knowledge of reactor engineering and numerical techniques. - Facilitates development of high fidelity models for industrial applications - Facilitates selection and application of appropriate models - Guides development and application of computational models to trickle beds

Published
2011

3. Estimation of overall heat transfer coefficients in packed beds with cocurrent downflow of gas and liquid

Author

Nestor Javier Mariani, María José Taulamet, Guillermo Fernando Barreto, and Osvaldo Miguel Martinez

Subjects
Chemistry, General Chemical Engineering, Organic Chemistry, Trickle bed reactors, Energy Engineering and Power Technology, Thermodynamics, Heat transfer coefficient, INGENIERÍAS Y TECNOLOGÍAS, Ingeniería Química, Fuel Technology, Otras Ingeniería Química, One-dimensional pseudohomogeneous model, Geomorphology, Overall heat transfer rates
Abstract

This contribution undertakes the analysis of heat transfer between a packed bed with cocurrent downflow of gas and liquid, widely known as trickle bed reactor, and an external heating or cooling fluid. Experiments were carried out in a bench scale reactor with water and air, covering trickle and pulsing regimes, in beds presenting aspect ratios (tube to particle diameter ratio) from 4.7 to 34. Four sizes of glass spheres, two of glass cylinders, a mixture of spheres and a commercial trilobe pellet were employed as particles. With the purpose of estimating the overall heat transfer rates, a 1D pseudo-homogeneous model with a single parameter (overall bed heat transfer coefficient, hT) was employed to analyze the experimental results. An expression to estimate hT (expressed as Nusselt number) for the low interaction regime in terms of liquid Reynolds number, a pellet shape factor and bed to particle diameter ratio is proposed. This expression approximates the experimental values with an average deviation of around 10%. Fil: Taulamet, María José. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigación y Desarrollo en Ciencias Aplicadas "Dr. Jorge J. Ronco". Universidad Nacional de la Plata. Facultad de Ciencias Exactas. Centro de Investigación y Desarrollo en Ciencias Aplicadas; Argentina Fil: Mariani, Nestor Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigación y Desarrollo en Ciencias Aplicadas "Dr. Jorge J. Ronco". Universidad Nacional de la Plata. Facultad de Ciencias Exactas. Centro de Investigación y Desarrollo en Ciencias Aplicadas; Argentina Fil: Barreto, Guillermo Fernando. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigación y Desarrollo en Ciencias Aplicadas "Dr. Jorge J. Ronco". Universidad Nacional de la Plata. Facultad de Ciencias Exactas. Centro de Investigación y Desarrollo en Ciencias Aplicadas; Argentina Fil: Martinez, Osvaldo Miguel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigación y Desarrollo en Ciencias Aplicadas "Dr. Jorge J. Ronco". Universidad Nacional de la Plata. Facultad de Ciencias Exactas. Centro de Investigación y Desarrollo en Ciencias Aplicadas; Argentina

Published
2014

4. Effect of partial wetting on liquid/solid mass transfer in trickle bed reactors

Author

Christophe Boyer, Carine Julcour-Lebigue, Loïc Baussaron, Anne-Marie Wilhelm, Henri Delmas, IFP Energies Nouvelles - IFPEN (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), and Centre National de la Recherche Scientifique - CNRS (FRANCE)

Subjects
Mass transfer coefficient, Turbulence, Chemistry, Applied Mathematics, General Chemical Engineering, Flow (psychology), Trickle bed reactors, Thermodynamics, Wetting efficiency, General Chemistry, Trickle-bed reactor, Multiphase reactors, Industrial and Manufacturing Engineering, Condensed Matter::Soft Condensed Matter, Physics::Fluid Dynamics, Mass transfer, Hydrodynamics, Génie chimique, Wetting, Two-phase flow, TRICKLE, Trickle flow
Abstract

The wetting efficiency of liquid trickle flow over a fixed bed reactor has been measured for a wide range of parameters including operating conditions, bed structure and physico-chemistry of liquid/solid phases. This data bank has been used to develop a new correlation for averaged wetting efficiency based on five different non-dimensional numbers. Finally liquid/solid mass transfer has been determined in partial wetting conditions to analyse what are the respective effects of wetting and liquid/gas flow turbulence. These effects appear to be separated: wetting being acting on liquid/solid interfacial area while the liquid/solid mass transfer coefficient is mainly connected to flow turbulence through the interstitial liquid velocity. A correlation has been proposed for liquid/solid mass transfer coefficient at very low liquid flow rate.

Published
2007

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