Title:
Characterizing Biomass Residues to Improve the Quality of Bottom and Fly Ashes in Two Power Plants
Author(s):
Ramos Silva, D., Tarelho, L.A.C., Figueiredo Silva, J., Freire, M., Lopes, M.H.S.D.
Document(s):
Paper
Poster
Abstract:
The forest area in Portugal occupies about 3.5 million hectares, being the Pinus pinaster and Eucalyptus globulus stands the most important and more concentrate in the North and Center of Portugal. As consequence, the quantity of ashes and other wastes from the boilers is estimated in 100 thousandths tones in the thermoelectric plants managed by the pulp and paper industry. This quantity of ashes depends of the biomass quality and the boiler technology (grate or fluidized bed). Therefore, it is an important issue to characterize the biomass that feeds the boilers and determine the quantity of inerts mixed with the biomass, which causes the increase of ashes quantity. So, the first priority is minimize these amounts in the biomass, before landfill or valorization (e.g. ash recycling to the soil) options. With the objective of characterizing the biomasses from two power plants, equipped with bubbling fluidized bed and grate furnace combustion technologies, a sampling plan was carried over one year. The biomass samples were collected at regular intervals over one year in order to analyze the variation of their physical-chemical properties, namely the proximate and ultimate analysis, inert content and heating value of the biomass. The results obtained allow the evaluation of the influence of some physical-chemical characteristics of the biomass on the produced ashes, namely the moisture and inert contents, and in the overall power plant performance. And in order to contribute to the sustainability in the value chain of the biomass to energy, giving priority to the study of the management operations that concerning the application of biomass ashes to the soil.
Keywords:
calorific value, thermochemical conversion, ashes, management, biomass fuels
Topic:
Biomass resources
Subtopic:
Biomass feedstock, residues and by-products
Event:
21st European Biomass Conference and Exhibition
Session:
1BV.1.24
Pages:
235 - 240
ISBN:
978-88-89407-53-0
Paper DOI:
10.5071/21stEUBCE2013-1BV.1.24
Price:
FREE
