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.
Issue Section:
Combustion and Reactive Flows
Keywords:
packed-bed,
radiation,
solar energy,
gasification,
chemical reactors,
computerised tomography,
flow through porous media,
Monte Carlo methods,
particle size,
probability,
radiative transfer,
thermomechanical treatment
Topics:
Carbon,
Computerized tomography,
Computers,
Electromagnetic scattering,
Fuel gasification,
Particle size,
Particulate matter,
Radiation scattering,
Radiative heat transfer,
Scattering (Physics),
Monte Carlo methods,
Porosity,
Radiation (Physics),
Image processing,
Syngas,
Albedo,
High temperature,
Solar energy
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