Title:
Physical-chemical Characteristics of Ash Flows in a Biomass Thermal Power Plant
Author(s):
Teixeira, E.R., Tarelho, L.A.C., Silva, T.C.S.R., Silva, D.F.R., Modolo, R.C.E.
Document(s):
Paper
Poster
Abstract:
In this work it was made the characterization of distinct ash flows in a biomass thermal power plant using bubbling fluidised bed technology. Bottom bed ashes differ significantly from fly ashes, in concern of both physical characteristics and chemical composition. It was observed a modification in some physical-chemical characteristics of the ashes in result of their exposition to atmospheric air. The pH of the distinct ash samples was alkaline, with values in range 10.3 to 12.7. The conductivity of the ashes varied in the range 0.9 to 19.3 mS/cm, with the fresh fly ashes from the electrostatic precipitator showing the higher value. During the atmospheric air exposition, a decrease in pH and conductivity of the ash leaching solutions was observed. Calcium was the water soluble element with higher concentration in the leaching solution. Due to ash exposition to atmospheric air, a decrease on the leaching of Ca and an increase on the Cl and Al from the fly ashes from the electrostatic precipitator was observed. The process of ash-atmospheric air interaction is of major importance considering the characterization of the ashes and their environmental management.
Keywords:
biomass, combustion, fluidized bed, ashes
Topic:
R&D on Biomass Conversion Technologies for Heating, Electricity and Chemicals
Subtopic:
Solid biofuel combustion in large utilities
Event:
21st European Biomass Conference and Exhibition
Session:
2DV.3.56
Pages:
1192 - 1202
ISBN:
978-88-89407-53-0
Paper DOI:
10.5071/21stEUBCE2013-2DV.3.56
Price:
FREE
