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A Shortcut Method to Predict Particle Size Changes during Char Combustion and Gasification under regime II Conditions

Abstract

In most industrial applications, combustion and gasification of char progresses under regime II conditions. Unlike in other regimes, both particle size and density change simultaneously in regime II due to non-uniform consumption of carbon inside the particles. In this work, mathematical predictions of diameter changes in regime II were made by a one-dimensional simulation tool, where transient species balances are resolved locally inside the particle. This simulation is computationally expensive and usually not appropriate for the implementation in comprehensive CFD simulations of combustion or gasification processes. To overcome this restraint, an alternative shortcut method with affordable computation time has been developed and validated against the detailed model. This method allows the calculation of diameter changes during combustion and gasification from precalculated effectiveness factors. Additionally, the change of particle size has been investigated experimentally in a single particle converter setup. Therein, particles are fixed on a sample holder placed in the hot flue gas of a flat flame burner. Size and temperature trends are optically assessed by a 3CCD camera.

Category

Academic article

Language

English

Author(s)

Affiliation

  • SINTEF Energy Research / Termisk energi
  • Luleå University of Technology
  • RWTH Aachen University

Year

2022

Published in

Combustion Science and Technology

ISSN

0010-2202

Volume

194

Issue

2

Page(s)

272 - 291

View this publication at Norwegian Research Information Repository