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Research Papers: Combustion and Reactive Flows

Tomography-Based Analysis of Radiative Transfer in Reacting Packed Beds Undergoing a Solid-Gas Thermochemical Transformation

[+] Author and Article Information
Sophia Haussener

Department of Mechanical and Process Engineering, ETH Zurich, 8092 Zurich, Switzerland

Wojciech Lipiński

Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN 55455

Peter Wyss

Department of Electronics/Metrology, EMPA Material Science and Technology, Überlandstrasse 129, 8600 Dübendorf, Switzerland

Aldo Steinfeld1

Department of Mechanical and Process Engineering, ETH Zurich, 8092 Zurich, Switzerland and Solar Technology Laboratory, Paul Scherrer Institute, 5232 Villigen, Switzerlandaldo.steinfeld@ethz.ch

1

Corresponding author.

J. Heat Transfer 132(6), 061201 (Mar 25, 2010) (7 pages) doi:10.1115/1.4000749 History: Received May 15, 2009; Revised October 22, 2009; Published March 25, 2010; Online March 25, 2010

A reacting packed-bed undergoing a high-temperature thermochemical solid-gas transformation is considered. The steam- and dry-gasification of carbonaceous materials to syngas is selected as the model reaction. The exact 3D digital geometrical representation of the packed-bed is obtained by computer tomography and used in direct pore-level simulations to characterize its morphological and radiative transport properties as a function of the reaction extent. Two-point correlation functions and mathematical morphology operations are applied to calculate porosities, specific surfaces, particle-size distributions, and representative elementary volumes. The collision-based Monte Carlo method is applied to determine the probability distribution of attenuation path length and direction of incidence at the solid-fluid boundary, which are linked to the extinction coefficient, scattering phase function, and scattering albedo. These effective properties can be then incorporated in continuum models of the reacting packed-bed.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic of the tubular packed-bed reactor setup used for the gasification of carbonaceous materials

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Figure 2

Carbon extent XC as a function of reaction time for five different sets of process parameters, as described in Table 1

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Figure 3

Tomograms of the reference case sample for: (a) scans (voxel size=10 and 5 μm) at XC=0, 0.3, 0.7, and 1, and (b) submicron scans (voxel size=0.37 μm) of a particle at XC=0.3

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Figure 4

A 3D rendered geometry of the reference case at XC=0 with cube length of 1.5 cm

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Figure 5

Experimentally determined porosity for the packed-bed of tire shred as a function of carbon conversion for the five experimental runs listed in Table 1

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Figure 6

Experimentally determined specific surface area (a) and the corresponding fraction resulting from micropores (b) as a function of carbon conversion for the five experimental runs listed in Table 1

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Figure 7

Experimentally measured size distribution of the particles for the reference case at various carbon conversions XC=0,0.3,0.7,1

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Figure 8

Experimentally measured and numerically calculated porosity as a function of the carbon conversion for the reference case

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Figure 9

Numerically calculated particle-size distribution for the reference case at various carbon conversions XC=0,0.3,0.7,1

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Figure 10

Extinction coefficient as a function of carbon conversion (markers) and its fit (solid line) given by Eq. 11

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Figure 11

Scattering phase function for the reference case at various carbon conversions XC=0,0.3,0.7,1 for diffusely and specularly reflecting particles

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