Title:
Determination of Bridging Properties - Experimental and Model Approach
Author(s):
Hinterreiter, S., Hartmann, H., Turowski, P., Kallio, M., Lazdiņš, A., Zimelis, A., Rathbauer, J., Sulzbacher, L., Sønderstgaard Sørensen, K., Temmerman, M.
Document(s):
Paper
Abstract:
A test apparatus enabling to determine the length of a fuel bridge over an opening was developed in order to describe the physical-mechanical fuel characteristic of bridging. Two such testers were applied by 6 European partners who applied a uniform test procedure on a total of 85 large biomass fuel samples of 2 m3 volume. All samples were further analysed for angle of repose, moisture content, bulk density and image analysis parameters (e.g. particle size distribution, sphericity, length-diameter-ratio). The opening width (bridge length) of all tested fuels ranged from 0.8 cm (grain kernels) to 99 cm (unchopped grass). The mean coefficient of variation of the replications was between 5.4 % (wood pellets) and 20 % (sawdust). The angle of repose showed no satisfying correlation to the bridging measurement. But other influencing parameters for bridging were regarded in a multiple linear regression model. It was shown, that for wood samples (chips, hog fuel), the parameters mean particle size, mean sphericity and mean length-diameter-ratio are highly capable of explaining or predicting any unfavourable bridging phenomena. In this model, there was no significant influence of bulk density in bridging.
Keywords:
wood chips, angle of repose, bridging test method, image analysis, particle size distribution, physical-mechanical properties
Topic:
Fuels from biomass
Subtopic:
Production, supply and use of solid biofuels
Event:
18th European Biomass Conference and Exhibition
Session:
VP3.1.13
Pages:
1688 - 1698
ISBN-13:
978-88-89407-56-1
ISBN-10:
88-89407-56-5
Paper DOI:
10.5071/18thEUBCE2010-VP3.1.13
Price:
FREE
