Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Study of high-temperature interactions between ashes from cassava harvesting residues and inert materials via DTA/TG and SEM/EDS
Submission Author:
Handel Martinez Sarache , SP
Co-Authors:
Handel Martinez Sarache, Waldir Bizzo
Presenter: Handel Martinez Sarache
doi://10.26678/ABCM.COBEM2017.COB17-0347
Abstract
Agglomeration is a problem that presents during biomass combustion in fluidized bed combustors (FBC) because of high-temperature interactions between alkali-compounds within biomass and the silica in the bed material. This problem is characterized by bed material sintering inducing difficulties or loss of the fluidizing state. In this study, samples composed by mixtures between ashes from cassava harvest residues with silica-sand and dolomite were analyzed via Differential Thermal Analysis coupled with Thermogravimetric Analysis (DTA/TG) aimed to determine the temperature to which agglomeration beginning and the effect of employing a bed material with low silica content to reduce agglomerations in high-alkali-content biomass. Scanning Electron Microscopy with Energy Dispersive X-ray Spectroscopy (SEM/EDS) was employed in order to get a better comprehension of the structural composition of the samples prepared at chosen temperatures. The results showed the formation of two layers around sand particles at 910°C, in Ash-Sand samples, concording with coating-induced agglomeration route of formation. On the other hand, no interactions between ashes and dolomite were detected; however, high K-volatilization was identified between 580 and 900°C, demonstrating the dolomite utility as bed material during biomass combustion in FBC.
Keywords
Agglomeration, Agricultural residues, DTA/TG, SEM/EDS
