The possibility of a sawing residue as wood biomass energy and a reduction of carbon dioxide
2004
Kawashima, Y. (Tokyo Univ. of Agriculture and Technology, Fuchu (Japan)) | Iwaoka, M. | Minematsu, H.
The purpose of this study is to investigate the possibility of using sawing residue as wood biomass energy and its effects on reducing domestic carbon dioxide emission when used as energy for wood seasoning. For this purpose we calculated the amount of sawing residue and energy needed during wood seasoning, and estimated the total emission of CO2 that could be reduced by replacing fossil fuels with wood biomass. There are two types of sawing residue; one is bark and the other is wood. We measured the amount of bark with barker machine, and calculated the amount of wood from the difference between the weight of raw logs and processed lumber. The energy consumption of wood seasoning was derived by interviews with producers. As a result, we found the energy from sawing residue varies with water content as well as with the ratio of residue to raw logs. The amount of energy from wood biomass is enough for the whole seasoning process only when the woodchips that are usually used as pulp are used as fuel. The amount of reduction of CO2 is 8.6 tons per 100 cube m for such a case. For 26 million cube m of raw logs, which was Japan's total saw log consumption in 2000, the possible reduction of carbon dioxide emission was estimated to be 2.3 million tons. This is about 3% of the 74 million tons which Japan pledged to reduce in the Kyoto Protocol.
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