Abstract

Solid biomass as a biorefinery feedstock is physically and chemically heterogeneous which stress the need for rapid and accurate methods for characterization and classification. In this study, stem wood, hemp, grape and olive residues were characterized using X-ray fluorescence (XRF) spectroscopy and principal component analysis. XRF spectra were processed by partial least squares (PLSs) regression and used to construct calibration models for several important ash-related elements. The models for the ash's phosphorous, aluminium and ash contents all had excellent predictive accuracy, with performance-to-deviation ratios above three. The models for the potassium, silica, calcium, sodium and magnesium content exhibited lower predictive accuracies. Relevant energy intervals (bins) were selected using interval PLS and variable importance on projection scores. In most cases, bin-selection increased the models' predictive accuracy and facilitated their interpretation.

Keywords

Biorefinery feedstock; X-ray fluorescence spectroscopy (XRF); Ash elements; Ash content; Calibration models

Published in

Applied Energy
2013, Volume: 102, number: SI, pages: 1288-1294
Publisher: ELSEVIER SCI LTD

SLU Authors

• Thyrel, Mikael

  • Department of Forest Biomaterials and Technology, Swedish University of Agricultural Sciences
    

• Samuelsson, Robert

  • Department of Forest Biomaterials and Technology, Swedish University of Agricultural Sciences
    

• Finell, Michael

  • Department of Forest Biomaterials and Technology, Swedish University of Agricultural Sciences
    

• Lestander, Torbjörn

  • Department of Forest Biomaterials and Technology, Swedish University of Agricultural Sciences
    

UKÄ Subject classification

Renewable Bioenergy Research
Bioengineering Equipment
Other Chemical Engineering


Publication identifier

DOI: https://doi.org/10.1016/j.apenergy.2012.06.058

Permanent link to this page (URI)

https://res.slu.se/id/publ/40861