Article (Scientific journals)
Methods for size classification of wood chips
Hartmann, Hans; Böhm, Thorsten; Daugbjerg Jensen, Peter et al.
2006In Biomass and Bioenergy
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Keywords :
Particles; Size distribution; Wood chips
Abstract :
[en] Methods for size classification of wood chips were analysed in an international round robin using 13 conventional wood chip samples and two specially prepared standard samples, one from wood chips and one from hog fuel. The true size distribution of these two samples (according to length, width and height) had been determined stereometrically (reference method) using a digital calliper gauge and by weighing each of the about 7000 wood particles per sample. Five different horizontal and three rotary screening devices were tested using five different screen hole diameters (3.15, 8, 16, 45, 63 mm, round holes). These systems are compared to a commercially available continuously measuring image analysis equipment. The results show that among the devices of a measuring principle—horizontal and rotary screening—the results are quite comparable, while there is a severe incompatibility when distributions are determined by different measuring principles. Highest conformity with the reference values is given for measurements with an image analysis system, whereas for all machines with horizontal screens the median value of the size distribution only reached between one-third to half of the reference median value for the particle length distribution. These deviations can be attributed to a higher particle misplacement, which is particularly found in the larger fractions. Such differences decrease when the particle’s shape is more roundish (i.e. sphericity closer to one). The median values of length distributions from screenings with a rotary classifier are between the measurements from an image analysis and horizontal screening devices.
Disciplines :
Energy
Author, co-author :
Hartmann, Hans
Böhm, Thorsten
Daugbjerg Jensen, Peter
Temmerman, Michaël ;  Université de Liège - ULiège > Doct. sc. agro. & ingé. biol.
Rabier, Fabienne
Golser, Michael
Language :
English
Title :
Methods for size classification of wood chips
Publication date :
2006
Journal title :
Biomass and Bioenergy
ISSN :
0961-9534
eISSN :
1873-2909
Publisher :
Pergamon, Oxford, United Kingdom
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 03 August 2013

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