Fragmentation of biomass particles in fixed and fluidized bed combustion and gasification

Abstract

It is shown that when burning (gasifying) biomass in the fixed (fluidized) bed, it is important to take into account the change in particle size due to their fragmentation. The analysis of the current state of research of fragmentation processes is carried out. It is shown that considerable contribution to the grinding of fuel particles is made by primary fragmentation, and the main factors affecting primary fragmentation are particle size, heating rate, bed temperature, and fuel characteristics. The first results of studies of primary fragmentation of wood biomass particles in an inert medium at different temperatures are presented. The influence of bed temperature, particle size and shape on the quantitative characteristics and criteria of particle fragmentation, causes and nature of wood particle cracking are considered and analyzed.