Method and apparatus for inhibiting pitch formation in the wet seal exhaust duct of a veneer dryer
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United States of America Patent
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Feb 26, 2013
Grant Date -
Feb 16, 2012
app pub date -
Oct 24, 2011
filing date -
Oct 12, 2006
priority date (Note) -
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Abstract
A method and apparatus for operating a dryer used to reduce the moisture content of sheet material. A drying chamber is provided and includes a plurality of drying sections and a single point exhaust system. A seal section located at the input end of the dryer includes an exhaust passage through which a gas sample is drawn by a sampling fan. Gases within the seal section are a combination of ambient air drawn through restricted passages at the entry to the seal section and exhaust gas that bleeds into the seal section from the drying chamber. A controller monitors the temperature of the sampled gases and ambient air and adjusts the rate of exhaust flow from the main exhaust system as a function of the temperature differential. A heating system is also provided for heating the seal exhaust gases above the pitch condensation temperature for the flow.
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