Field wood - an alternative energy resource - problems and solutions during storage
2006
Idler, C.(Institute of Agricultural Engineering, Potsdam (Germany))E-mail:[email protected] | Scholz, V.(nstitute of Agricultural Engineering, Potsdam (Germany)) | Daries, W.(nstitute of Agricultural Engineering, Potsdam (Germany)) | Egert, J.(nstitute of Agricultural Engineering, Potsdam (Germany))
The storage of chips of recently harvested field wood in unventilated piles may cause a high loss of dry matter and a significant increase of allergy-inducing mould fungi. The following paper presents the results of various storage experiments on a half-technical scale with poplar, willow and pine of different size, as chips, chunks and whole trees. It is shown that the moisture content of chunks in rain-protected piles decreases from more than 50% to nearly 20% during a storage period of one year of one year and that the loss of dry matter is approximately only half of that in chip piles. Considering the moisture content there is no loss of energy in protected chunk piles, while fine chips lose more than 10% p.a. Regarding the total amount of fungi and yeast there are no significant differences between the various sorts and sizes of wood, but in chunk and whole-tree piles the hazardous thermophilic fungi species are very rare.
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