Quantifying the total organic compound emissions during kiln drying of 2 by 6 coastal Douglas-fir lumber and analyzing the effects of drying conditions Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/6h440w181

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  • Volatile organic emissions (VOCs) from the kiln drying of lumber are of concern to government, research agencies, and the forest products industry. In the Pacific Northwest, neither the quantity of VOC emissions from kilns drying Douglas-fir is available, nor the effects of drying schedule and lumber-related characteristics on the emissions. This research presents a reference for industrial permits and pollution regulations. An experimental set-up based on EPA Method 25A was made to obtain the total hydrocarbon (THC) emissions from 15 laboratory kiln charges of 2" by 6" Douglas-fir lumber. Dryer temperatures ranged from 160°F to 200°F with initial wet-bulb depressions from 10°F to 20°F. For the typical schedule starting at 180°F with a 165°F wet-bulb temperature, the unit THC emission, from green to a 12% final moisture content, is 0.47 g propane/kg oven dried wood. Based on a specific gravity of 0.48 and a target size of 1.68" by 5.8", this is 0.95 lb propane/ MBF. At the 95% confidence level, the mean emission level from wood dried at 200°F is significantly lower than that dried at 180 and 160°F. For the sample boards in the research, it is 0.126 and 0.147 g propane/kg od wood lower than the mean emissions at 180 and 160°F, respectively. And, a greater moisture content change or water loss from the wood caused higher THC emissions within the experimental range of 44% to 65% initial moisture content. Charges at 60% initial moisture content can be expected to have 11% higher emissions than charges initially at 50% moisture content. Wet-bulb temperature depression has no effect on the emission level. No other wood property was found to significantly affect emissions due to the presorting and random grouping of the experimental board samples.
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