Transpirational drying of flat piled logging residues for wood fuel chips
2009
Ichihara, T.(Kochi-ken. Forestry Technology Research Center, Kami (Japan)) | Yamaguchi, T. | Masaoka, H. | Itai, T. | Matsuoka, Y. | Miyata, D. | Kobatake, A. | Suzuki, Y. | Fujiwara, S.
We analyzed the influence of drying condition on drying speed (arrival day of moisture content 50% or decline trend of moisture content) under the condition that character of logs (height above ground, log length) or drying methods (days of drying, paved or unpaved, using or not using of crossbeam, presence or absence of roof) to develop efficient dry method of Japanese cypress and Japanese cedar for woody biomass boiler. The days required to reach 50% moisture content were that in case of Japanese cypress of 80% initial moisture content were 83-151 days and in case of Japanese cedar of 130% initial moisture content were 93-187 days. The drying rate of cypress was faster in order 1 m log with roof and crossbeam, 1 m log on paved area and 2 m log on paved area. In case of cedars the drying rate was faster in order 2 m logs with crossbeams on paved area, 2 m logs with crossbeam on ground, 2 m logs on paved area, and 2 m logs on ground. About paved and unpaved, drying speed of paved area was faster than unpaved area. The drying speed was faster in the case of using crossbeams and paved area. Drying speed in case of using crossbeams on unpaved place was as fast as that of using crossbeams on paved place.
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