Operating Conditions of Binary Mixtures of Biomass Wastes in Spouted Bed Contactors for Using Energy
M.J. San José, S. Alvarez, L.B. López, I. Garcia
Universidad del Pais Vasco, ES
Keywords: spouted beds, biomass wastes, operating conditions, binary mixtures, thermal treatment
Abstract:Due to the increasing costs of fossil fuels, interest has grown in the use of renewable energy. Spouted bed technology is suitable for the thermal treatment of biomass by combustion and by pyrolysis. Therefore, it would be adequate for using energy of biomass wastes, due to the ability to handle granular, fibrous and sticky materials with a wide particle size distribution and mixtures of different sizes and textures with low segregation (Olazar et al., 1993, San José et al., 1993, 1994). The hydrodynamics of beds consisting of biomass mixtures wastes of different characteristics in spouted beds of different geometry (contactor angle, gas inlet diameter) and in different operating conditions (stagnant bed height, particle diameter, gas velocity) has been studied. The solid used have been binary mixtures of sawdust, shaving, bark, leaves, branches and wood chips of different Sauter mean diameter and solid density of the mixture ρs= 540 kg/m3. The results have determined that the spouted bed contactors allow for operating of binary mixtures of biomass wastes in stable regime and without significant segregation, so this contact regime has good prospects for its use in operations and processes that required handling of particles of different density and mean Sauter diameter.