Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 64648
Title Drying characteristics of willow chips and stems
Author(s) Gigler, J.K.; Loon, W.K.P. van; Seres, I.; Meerdink, G.; Coumans, W.J.
Source Journal of Agricultural Engineering Research 77 (2000)4. - ISSN 0021-8634 - p. 391 - 400.
Department(s) Systems and Control Group
Publication type Refereed Article in a scientific journal
Publication year 2000
Abstract In supply chains of willow (Salix viminalis) biomass to energy plants, drying is advisable in order to enable safe long-term storage, increase boiler efficiency and reduce gaseous emissions. To gain insight into the drying process, drying characteristics of willow chips and stems were investigated experimentally in a drying installation. The drying process was modelled with a diffusion equation. The effective water diffusivity Deffwas assumed to be a simple algebraic function of the dimensionless moisture concentration m:Deff =D0ma, with D0being the initial diffusivity, and a an empirical exponent. Drying of a chip and of a stem without bark could be successfully described with a diffusion equation for a plane sheet and a cylinder, respectively. Drying of a stem with bark could be successfully described as drying of a stem without bark surrounded by a thin layer (bark) with a much lower diffusivity. Compared to a chip, a stem without bark dried approximately 10 times slower from fresh state to equilibrium moisture content, mainly due to the larger diffusion distance of the stem. A stem with bark dried approximately 10 times slower than a stem without bark due to the low diffusivity of the bark.
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