Utilising Thermodynamic Equilibrium Calculations to Model Potassium Capture by Additives in Biomass Combustion Plants

When it comes to the modelling of solid additive particles, many current attempts are still using a high-level approach, leaving out the mechanistic detail on a particle level to reduce model complexity. This paper shows different ways in which thermodynamic equilibrium calculations can help to understand the processes inside additive particles and to generate sub-models for detailed CFD-calculations. First, the influence of the additive's chemical composition on its maximum capture value is investigated. Afterwards, two sub-models for the behaviour of additives in combustion chambers are presented: one model for the calculation of the liquid fraction inside a particle, as well as a model for the in-situ determination of an additive particle's capture ceiling function. This knowledge can help improve models of solid additive particles and help optimise their use in thermal power plants.     «

When it comes to the modelling of solid additive particles, many current attempts are still using a high-level approach, leaving out the mechanistic detail on a particle level to reduce model complexity. This paper shows different ways in which thermodynamic equilibrium calculations can help to understand the processes inside additive particles and to generate sub-models for detailed CFD-calculations. First, the influence of the additive's chemical composition on its maximum capture value is inv...     »