Modelling of particle-turbulence-chemistry interaction for oxy-fuel processes (B06)

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The overall aim of this subproject is the development of consistent models and methods for describing the interaction between turbulence, chemistry and particles, which take into account different aspects of the coal conversion process. This formulation of the particle and the gas phase combustion is realized by high-dimensional FGM chemistry tabulation. Effects of non-adiabatic physics and finite rate chemistry are considered as well as two mixture fractions accounting for volatiles and char. Furthermore, a variation of the devolatilization products, determined by a progress variable for the devolatilization process, is introduced for the first time. Within the next period a field-based transported FDF-method will be developed. It will allow for the high dimensionality of the developed Flamelet model as well as for the interaction with the dispersed phase. The extension of the fuel spectrum by adding biomass impacts various aspects of the models and will be consistently elaborated and implemented. Besides kinetics of char conversion and pyrolysis of a broad fuel spectrum a particle fragmentation model, which describes the stochastic bursting and decomposing of particles, will be included into the models. Validation of the diverse sub-models will be carried out by comparisons to experimental observations.