Title: A CFD-applicable discrete combustion model for thermally large particles

Authors: Mika Jarvinen; Christian Mueller; Mikko Hupa; Carl-Johan Fogelholm

Addresses: Department of Energy Technology, Energy Engineering and Environmental Protection, Aalto University, P.O. Box 14400, Sahkomiehentie 4A, 00076 Aalto, Finland. ' Process Chemistry Center, c/o Combustion and Materials Chemistry, Abo Akademi University, Piispankatu 8, FI-20500, Turku, Finland. ' Process Chemistry Center, c/o Combustion and Materials Chemistry, Abo Akademi University, Piispankatu 8, FI-20500, Turku, Finland. ' Department of Energy Technology, Energy Engineering and Environmental Protection, Aalto University, P.O. Box 14400, Sahkomiehentie 4A, 00076 Aalto, Finland

Abstract: The objective of this paper is to present a comprehensive new single-particle combustion model that can be used effectively in Computational Fluid Dynamics (CFD) applications. As a major difference from standard particle sub-models used in CFD software packages, the new model is suitable for simulating thermally large particles, which means that it considers the intra-particle temperature gradients and overlapping stages of drying, pyrolysis and char conversion. The model was validated by comparison with experiments and also with a more detailed model presented in our earlier work. Although the model was applied here for black liquor combustion, it is also suitable and can be used for other different applications, such as the combustion of biomass, coal or heavy fuel oil and metallurgical processes.

Keywords: discrete particle combustion sub-model; large particles; CFD; computational fluid dynamics; drying; pyrolysis; char conversion; combustion modelling.

DOI: 10.1504/PCFD.2011.042847

Progress in Computational Fluid Dynamics, An International Journal, 2011 Vol.11 No.6, pp.373 - 387

Received: 08 May 2021
Accepted: 12 May 2021

Published online: 06 Oct 2011 *

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