Abstract
The coal of the project was to develop cleaning method for whole-tree chips made of birch and pine. The wood loss should be as small as possible and the bark content less than 2 %. The new cleaning system has been planned on the basis of experiments, supplemented with earlier knowledge. The cleaning system consists of grinding of the whole-tree chips followed by multi-stage segregation process for clean chips and bark fractions. A lot of wood containing bark fraction is recycled to the grinding to decrease wood loss. Experiments have been made partly in laboratory scale and partly in pilot-scale. The result has been calculated on the basis of the separate experiments. The bark content of cleaned chips is 0.5-1 %. The wood loss in the birch whole-tree chips over 7 mm fraction is 20 % and in pine whole-tree fraction 12 %. The wood contains also branchwood. The yield of wood can be as high as 150 % compared to merchantable stemwood. The costs of the wood-chip cleaning have been estimated to be about 12 FIM/m{sup 3} (solid). As a whole it has been estimated, that the cost of pulp chips from small-sized trees harvested by chip cleaning method
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Seppaenen, V
[1]
- Technical Research Centre of Finland, Jyvaeskylae (Finland). Combustion and Thermal Engineering Laboratory
Citation Formats
Seppaenen, V.
Forest chip cleaning; Metsaehakkeen puhdistus.
Finland: N. p.,
1991.
Web.
Seppaenen, V.
Forest chip cleaning; Metsaehakkeen puhdistus.
Finland.
Seppaenen, V.
1991.
"Forest chip cleaning; Metsaehakkeen puhdistus."
Finland.
@misc{etde_10141501,
title = {Forest chip cleaning; Metsaehakkeen puhdistus}
author = {Seppaenen, V}
abstractNote = {The coal of the project was to develop cleaning method for whole-tree chips made of birch and pine. The wood loss should be as small as possible and the bark content less than 2 %. The new cleaning system has been planned on the basis of experiments, supplemented with earlier knowledge. The cleaning system consists of grinding of the whole-tree chips followed by multi-stage segregation process for clean chips and bark fractions. A lot of wood containing bark fraction is recycled to the grinding to decrease wood loss. Experiments have been made partly in laboratory scale and partly in pilot-scale. The result has been calculated on the basis of the separate experiments. The bark content of cleaned chips is 0.5-1 %. The wood loss in the birch whole-tree chips over 7 mm fraction is 20 % and in pine whole-tree fraction 12 %. The wood contains also branchwood. The yield of wood can be as high as 150 % compared to merchantable stemwood. The costs of the wood-chip cleaning have been estimated to be about 12 FIM/m{sup 3} (solid). As a whole it has been estimated, that the cost of pulp chips from small-sized trees harvested by chip cleaning method are 80 FIM/m3 lower than by traditional cord wood method. Additional studies on the economy, the wood loss and bark content of the method are required before full-scale plant. The method is suitable for all wood chip cleaning purposes.}
place = {Finland}
year = {1991}
month = {Nov}
}
title = {Forest chip cleaning; Metsaehakkeen puhdistus}
author = {Seppaenen, V}
abstractNote = {The coal of the project was to develop cleaning method for whole-tree chips made of birch and pine. The wood loss should be as small as possible and the bark content less than 2 %. The new cleaning system has been planned on the basis of experiments, supplemented with earlier knowledge. The cleaning system consists of grinding of the whole-tree chips followed by multi-stage segregation process for clean chips and bark fractions. A lot of wood containing bark fraction is recycled to the grinding to decrease wood loss. Experiments have been made partly in laboratory scale and partly in pilot-scale. The result has been calculated on the basis of the separate experiments. The bark content of cleaned chips is 0.5-1 %. The wood loss in the birch whole-tree chips over 7 mm fraction is 20 % and in pine whole-tree fraction 12 %. The wood contains also branchwood. The yield of wood can be as high as 150 % compared to merchantable stemwood. The costs of the wood-chip cleaning have been estimated to be about 12 FIM/m{sup 3} (solid). As a whole it has been estimated, that the cost of pulp chips from small-sized trees harvested by chip cleaning method are 80 FIM/m3 lower than by traditional cord wood method. Additional studies on the economy, the wood loss and bark content of the method are required before full-scale plant. The method is suitable for all wood chip cleaning purposes.}
place = {Finland}
year = {1991}
month = {Nov}
}