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Long term storage of mixed bark-shavings fuel; Laangtidslagring av blandat bark-kutterspaansbraensle

Technical Report:

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  More>>
Authors:
Jirjis, R; Lehtikangas, P [1] 
  1. Swedish Univ. of Agricultural Sciences, Uppsala (Sweden)
Publication Date:
Dec 31, 1992
Product Type:
Technical Report
Report Number:
NUTEK-TB-92-8; SLU-VKL-R-230
Reference Number:
SCA: 094000; PA: SWD-92:007311; SN: 93000918390
Resource Relation:
Other Information: PBD: 1992
Subject:
09 BIOMASS FUELS; WOOD WASTES; STORAGE; BARK; SPRUCES; WOOD; CALORIFIC VALUE; MOISTURE; FUNGI; EXPERIMENTAL DATA; 094000; TRANSPORT, HANDLING, AND STORAGE
OSTI ID:
10113794
Research Organizations:
Swedish National Board for Industrial and Technical Development (NUTEK), Stockholm (Sweden); Swedish Univ. of Agricultural Sciences, Uppsala (Sweden). Dept. of Forest Products
Country of Origin:
Sweden
Language:
Swedish
Other Identifying Numbers:
Other: ON: DE93753078; CNN: Project NUTEK-146-337; TRN: SE9207311
Availability:
OSTI; NTIS
Submitting Site:
SWD
Size:
50 p.
Announcement Date:
Jun 30, 2005

Technical Report:

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}
}