The objective of this work is to study heat and mass transfer processes in a single biomass particle before its thermal degradation (< 200 o C) under high intense acoustic fields. For that, was developed a numerical code for Biot number higher that one, i.e., non-isothermal particles. The hypothesis is that an acoustic field alters the interaction between the gas and particles, proving drying. Acoustic fields can be obtained by using a loudspeaker inside a reactor. The proposed model predicts moisture mass transfer completion for different particle sizes and oscillating frequencies. The obtained data are relevant for plant conversion capacity and reactor's preliminary design.

Oxy-fuel combustion (OFC) is a promising technology for Carbon Capturing and Storage (CCS) in power generation systems. This work presents a mathematical model to predict relevant gas engine parameters for combined heat and power application. Different oxidizer blends (O2 + CO2) for the combustion of refuse-derived fuel pyrolysis gas were tested. Numerical predictions showed that oxy-fuel combustion of RDF pyrolysis gas in power engines did not penalize system thermal efficiency. The exhaust gas temperature and heat content suit combined heat and power plants under zero emissions operation.