Title:
Holistic Approach to Predict the Ash Melting Behaviour of European Solid Biofuels
Author(s):
Fernández, M., Carrasco, J., Mediavilla, I., Barro, R., Brunner, T., Thek, G., Obernberger, I.
Document(s):
Paper
Slide presentation
Abstract:
A total of ten solid biomass fuels of actual or potential interest in Europe were selected and used in a boiler (50 kWth). The fuels were analysed regarding ash forming elements by using ICP-OES, moreover X-ray diffraction was applied for the characterisation of ashed fuel samples. The ash melting behaviour of the fuels was determined according to CEN/TS 15370-1, and alternatively two sintering indexes and two in-house methods, so called “disintegration” and “sieving” methods were used. Moreover, theoretical considerations based on thermodynamic high-temperature equilibrium calculations (TEC) were developed to identify the mechanisms of ash sintering of the biomass fuels studied. The main sintering predictions performed in laboratory by sintering tests confirm the results obtained from combustion tests. By considering the disintegration method and ash sieving method, olive stones and almond shells will form hard sintered ash agglomerates at 800 ºC, agropellets at 900 ºC, poplar and vineyard pruning at 1000 ºC, miscanthus and willow at 1100 ºC, olive tree pruning and forest residue (good quality) at temperatures even higher than 1400 °C. These results are in reasonable agreement with the predictions gained from the interpretation of two fuel indexes related to ash melting. However, it has been concluded that the CEN-Technical Specification 15370-1 needs to be extended/modified by other test methods like those considered in this work to gain reliable predictions regarding the ash melting behaviour of biomass fuels.
Keywords:
biomass, combustion, sintering, chemical composition
Topic:
Biomass Conversion Technologies for Heating, Cooling and Electricity
Subtopic:
Production and supply of solid fuels and intermediates
Event:
27th European Biomass Conference and Exhibition
Session:
2DO.7.1
Pages:
608 - 616
ISBN:
978-88-89407-19-6
Paper DOI:
10.5071/27thEUBCE2019-2DO.7.1
Price:
FREE
