Abstract
Tree residues (branches and tops) are a very bulky assortment suffering very high transport costs. One way of increasing the relative solid volume is to compress the material using a large crane with a dual selective lifting cylinder. Comparative studies with a conventional tree residue vehicle and a vehicle equipped with the above-mentioned crane were conducted on three occasions during the winter. In November, the vehicle with the large crane gave a 25% higher bulk weight of tree residues than the conventional vehicle. In December, the difference in bulk density was as much as 43 % higher for the large crane, and it was 33 % in January. In addition, the large crane has much faster movements, which results in the loading time being the same despite the load being much larger. The studies show that the moisture content can vary between 20-55 % within one and the same load. Results from the measurements of bulk weight mentioned above refer to comparable moisture contents. Transportation for 60 km with a conventional vehicle (18 tonnes, 55 MWh, and 135m{sup 3} load volume) implied a cost of 104 SEK per tonne according to the calculations, corresponding to 35 SEK per MWh. With
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Citation Formats
Norden, B, and Jonsson, N.
Compression of forest residues; Komprimering av traedrester vid transport.
Sweden: N. p.,
1992.
Web.
Norden, B, & Jonsson, N.
Compression of forest residues; Komprimering av traedrester vid transport.
Sweden.
Norden, B, and Jonsson, N.
1992.
"Compression of forest residues; Komprimering av traedrester vid transport."
Sweden.
@misc{etde_10141312,
title = {Compression of forest residues; Komprimering av traedrester vid transport}
author = {Norden, B, and Jonsson, N}
abstractNote = {Tree residues (branches and tops) are a very bulky assortment suffering very high transport costs. One way of increasing the relative solid volume is to compress the material using a large crane with a dual selective lifting cylinder. Comparative studies with a conventional tree residue vehicle and a vehicle equipped with the above-mentioned crane were conducted on three occasions during the winter. In November, the vehicle with the large crane gave a 25% higher bulk weight of tree residues than the conventional vehicle. In December, the difference in bulk density was as much as 43 % higher for the large crane, and it was 33 % in January. In addition, the large crane has much faster movements, which results in the loading time being the same despite the load being much larger. The studies show that the moisture content can vary between 20-55 % within one and the same load. Results from the measurements of bulk weight mentioned above refer to comparable moisture contents. Transportation for 60 km with a conventional vehicle (18 tonnes, 55 MWh, and 135m{sup 3} load volume) implied a cost of 104 SEK per tonne according to the calculations, corresponding to 35 SEK per MWh. With a large crane capable of packing the load, the load weight can be increased to 24 tonnes, 73 MWh, according to the study. The corresponding cost will then be 81 SEK per tonne (26 SEK per MWh). Full utilisation of the vehicle with the large crane will enable transportation of more than 22 000 tonnes (67 GWh) of tree residues annually, with an average transport distance of 60 km. According to this calculation, it could be done at a cost that is 510 000 SEK lower than that required by the conventional vehicle, or 8 SEK per MWh. (5 figs., 14 tabs.).}
place = {Sweden}
year = {1992}
month = {Nov}
}
title = {Compression of forest residues; Komprimering av traedrester vid transport}
author = {Norden, B, and Jonsson, N}
abstractNote = {Tree residues (branches and tops) are a very bulky assortment suffering very high transport costs. One way of increasing the relative solid volume is to compress the material using a large crane with a dual selective lifting cylinder. Comparative studies with a conventional tree residue vehicle and a vehicle equipped with the above-mentioned crane were conducted on three occasions during the winter. In November, the vehicle with the large crane gave a 25% higher bulk weight of tree residues than the conventional vehicle. In December, the difference in bulk density was as much as 43 % higher for the large crane, and it was 33 % in January. In addition, the large crane has much faster movements, which results in the loading time being the same despite the load being much larger. The studies show that the moisture content can vary between 20-55 % within one and the same load. Results from the measurements of bulk weight mentioned above refer to comparable moisture contents. Transportation for 60 km with a conventional vehicle (18 tonnes, 55 MWh, and 135m{sup 3} load volume) implied a cost of 104 SEK per tonne according to the calculations, corresponding to 35 SEK per MWh. With a large crane capable of packing the load, the load weight can be increased to 24 tonnes, 73 MWh, according to the study. The corresponding cost will then be 81 SEK per tonne (26 SEK per MWh). Full utilisation of the vehicle with the large crane will enable transportation of more than 22 000 tonnes (67 GWh) of tree residues annually, with an average transport distance of 60 km. According to this calculation, it could be done at a cost that is 510 000 SEK lower than that required by the conventional vehicle, or 8 SEK per MWh. (5 figs., 14 tabs.).}
place = {Sweden}
year = {1992}
month = {Nov}
}