Mathematical model of gasification and combustion of biomass

Abstract

This contribution deals with the creation of mathematical model of biomass gasification and combustion. In the introduction of contribution an analysis is given of biomass in terms of its occurrence, composition, and caloric value and also in terms of processes taking place with the biomass gasification and combustion. The idea for a complex model for the gasification and combustion of biomass is derived from the initial process analysis, which was suggested as a synthesis of elementary process models. In the case of elementary models the heating model, drying model, thermal decomposition model, oxidation of the solid component model, and oxidation of the volatile component model are considered. The heating model is based on the processes of heat accumulation and the transfer of heat by convection. The basis of the evaporation model is a process of the transformation of liquid water into water vapour. The remaining three models include the thermal decomposition of biomass, release of the volatile components and the burning of the solid components from it. Elementary process models were independently implemented and verified in a MATLAB environment as individual m-functions. The results from the simulations are also stated in this contribution, which are analyzed, and further use and method of model gasification and combustion is suggested.