Chapter 4

Mathematical Modelling and Model Validations

Abstract

A CFD-based numerical model, including improved combustion models for oxyfuel flames was developed and presented.

A new algorithm for coal particle modelling was introduced. Due to the higher partial pressures of oxygen, carbon dioxide, and water vapour in oxyfuel than in air combustion, the proposed model is based on the assumption that the devolatilisation and the char oxidation/gasification run in parallel, thus overlapping in time.

Empirical and advanced structural models for coal particle devolatilisation were tested against experimental data, showing correct correlation of the rate of particle weight loss with empirical kinetics and estimated ultimate volatile yield.

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