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Numerical approaches for thermochemical conversion of char

Abstract

This paper gives a review of the current state of the art for numerical simulations of char conversion. In particular, it presents models that have been developed to describe the physical and chemical phenomena that characterize thermochemical char conversion. All particle sizes are covered, ranging from pulverized particles to wood logs. The aim of the paper is to give the reader the required starting point in order to develop his own simulation tool. Two fundamentally different approaches are studied in detail, namely the resolved particle approach and the point particle approach. In the resolved approach, both the char particle itself and the surrounding boundary layer is resolved. This means that heat, mass and momentum transfer are accurately handled. For the point particle approach, which is computationally much cheaper, one has to rely on suitable models to estimate for example the heat, mass and momentum transfer. Finally, the paper also gives detailed descriptions of how to handle ash inclusions in the char in addition to particle fragmentation and thermal annealing. © 2022 The Author(s)

Category

Academic article

Client

  • Research Council of Norway (RCN) / 267916
  • EC/H2020 / 764697

Language

English

Author(s)

Affiliation

  • Norwegian University of Science and Technology
  • SINTEF Energy Research / Termisk energi
  • Stanford University

Year

2022

Published in

Progress in Energy and Combustion Science

ISSN

0360-1285

Volume

91

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