Abstract
Goal of this study was to examine consequences of storing bark mixed with dry shavings for 1 and 6 months. The pile comprised three sections: 40% spruce bark/60% shavings, 50% bark/50% shavings, and 100% bark. Each section contained 500 m{sup 3} fuel. Two profiles were marked with 7 sampling points/profile. Initial bark moisture content was 46.3% while shavings contained 11.2% moisture. After one month of storage all sections showed reduced moisture content. This decline continued in the sections with mixed material while bark section showed an increased value. At the end of the storage period, moisture content had declined by 10%. Bark moisture content was still below the initial moisture content. Due to microbial activity, fuel temperature rose to over 50 C within a few days. Number of microfungal spores initially was high (max 2x10{sup 10} and 3x10{sup 9} spores/kg d.wt. after one month). By the end of 6 months, total spore count averaged between 0.7-0.8x10{sup 10} spores/kg d.wt. O{sub 2}-concentration fell from 21% to 1-15% depending on the location of the measuring point. Simultaneously CO{sub 2} levels increased from 0.03% up to 2-19%. After one month of storage, dry matter loss was highest in the section with 40% bark
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Citation Formats
Jirjis, R, and Lehtikangas, P.
Long term storage of mixed bark-shavings fuel; Laangtidslagring av blandat bark-kutterspaansbraensle.
Sweden: N. p.,
1992.
Web.
Jirjis, R, & Lehtikangas, P.
Long term storage of mixed bark-shavings fuel; Laangtidslagring av blandat bark-kutterspaansbraensle.
Sweden.
Jirjis, R, and Lehtikangas, P.
1992.
"Long term storage of mixed bark-shavings fuel; Laangtidslagring av blandat bark-kutterspaansbraensle."
Sweden.
@misc{etde_10113794,
title = {Long term storage of mixed bark-shavings fuel; Laangtidslagring av blandat bark-kutterspaansbraensle}
author = {Jirjis, R, and Lehtikangas, P}
abstractNote = {Goal of this study was to examine consequences of storing bark mixed with dry shavings for 1 and 6 months. The pile comprised three sections: 40% spruce bark/60% shavings, 50% bark/50% shavings, and 100% bark. Each section contained 500 m{sup 3} fuel. Two profiles were marked with 7 sampling points/profile. Initial bark moisture content was 46.3% while shavings contained 11.2% moisture. After one month of storage all sections showed reduced moisture content. This decline continued in the sections with mixed material while bark section showed an increased value. At the end of the storage period, moisture content had declined by 10%. Bark moisture content was still below the initial moisture content. Due to microbial activity, fuel temperature rose to over 50 C within a few days. Number of microfungal spores initially was high (max 2x10{sup 10} and 3x10{sup 9} spores/kg d.wt. after one month). By the end of 6 months, total spore count averaged between 0.7-0.8x10{sup 10} spores/kg d.wt. O{sub 2}-concentration fell from 21% to 1-15% depending on the location of the measuring point. Simultaneously CO{sub 2} levels increased from 0.03% up to 2-19%. After one month of storage, dry matter loss was highest in the section with 40% bark (5%). By the end of the storage period, the sections with mixed fuel showed 8% loss and in bark losses reached 9.3%. Initial gross calorific value was similar in all sections (about 20.7 MJ/kg d.wt.) This value was marginally reduced during storage. Net calorific value became slightly higher in mixed material because of drying. These results indicate that mixtures of bark could be stored outdoors in 7 m high piles, for the period May-November with relatively small risks for spontaneous combustion, minimal health hazard and producing a fuel with acceptable quality. However, under different conditions storage results could be different. (13 refs., 10 tabs., 14 figs.).}
place = {Sweden}
year = {1992}
month = {Dec}
}
title = {Long term storage of mixed bark-shavings fuel; Laangtidslagring av blandat bark-kutterspaansbraensle}
author = {Jirjis, R, and Lehtikangas, P}
abstractNote = {Goal of this study was to examine consequences of storing bark mixed with dry shavings for 1 and 6 months. The pile comprised three sections: 40% spruce bark/60% shavings, 50% bark/50% shavings, and 100% bark. Each section contained 500 m{sup 3} fuel. Two profiles were marked with 7 sampling points/profile. Initial bark moisture content was 46.3% while shavings contained 11.2% moisture. After one month of storage all sections showed reduced moisture content. This decline continued in the sections with mixed material while bark section showed an increased value. At the end of the storage period, moisture content had declined by 10%. Bark moisture content was still below the initial moisture content. Due to microbial activity, fuel temperature rose to over 50 C within a few days. Number of microfungal spores initially was high (max 2x10{sup 10} and 3x10{sup 9} spores/kg d.wt. after one month). By the end of 6 months, total spore count averaged between 0.7-0.8x10{sup 10} spores/kg d.wt. O{sub 2}-concentration fell from 21% to 1-15% depending on the location of the measuring point. Simultaneously CO{sub 2} levels increased from 0.03% up to 2-19%. After one month of storage, dry matter loss was highest in the section with 40% bark (5%). By the end of the storage period, the sections with mixed fuel showed 8% loss and in bark losses reached 9.3%. Initial gross calorific value was similar in all sections (about 20.7 MJ/kg d.wt.) This value was marginally reduced during storage. Net calorific value became slightly higher in mixed material because of drying. These results indicate that mixtures of bark could be stored outdoors in 7 m high piles, for the period May-November with relatively small risks for spontaneous combustion, minimal health hazard and producing a fuel with acceptable quality. However, under different conditions storage results could be different. (13 refs., 10 tabs., 14 figs.).}
place = {Sweden}
year = {1992}
month = {Dec}
}