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KMID : 1024520080170121381
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Journal of the Environmental Sciences
2008 Volume.17 No. 12 p.1381 ~ p.1390
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Emission Characteristics of VOCs in Drying Process for Plywood Manufacturing
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Jang Jeong-Gook
Kim Mi-Ran
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Abstract
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Emission characteristics of volatile organic compounds (VOCs) were investigated in the flue gas emitted from wood drying process for plywood manufacturing. The moisture content of raw timber was average 48%, and its density was . But the moisture content of dried wood is needed less than around 10%, thus the moisture contents of flue gas should be remarkably high(about 18.2 V/V%). Therefore, the vapor in flue gas is equivalent to 320 ton-vapor/day when 1100 ton-wood/day is treated in the wood drying process. The temperature of flue gas ranges from in each dryer stack with exception of the input site of wood(about ). The velocity of flue gas in each stack ranges from 1.7 to 9.7m/sec. In order to assess the concentrations and attribution rate of odorous compounds, it was analyzed about 40 VOCs in the flue gases. It was found that the major odorous compounds were 8 compounds, and the concentrations of major VOCs(ppm) were as follows; benzene: , toluene: , ethylbenzene: , m,p-xylene: , styrene: , o-xylene : , ethanol: , -pinene: , -pinene: . The attribution rate of terpenes (-pinene, -pinene) was about 60.56%, and that of aromatics and alcohols was about 22.77%, and 16.67%, respectively. It is suggested that the adequate control device should be used to control both the water soluble and non-soluble compounds because both compounds were mixed in flue gas.
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KEYWORD
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Plywood, Drying process, BTX(benzene toluene xylene), VOCs
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