Method and apparatus for inhibiting pitch formation in the...

F - Mech Eng,Light,Heat,Weapons – 26 – B

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Details

IPC codes

F26B 15/18 (2006.01) B27L 5/00 (2006.01) F26B 3/04 (2006.01) F26B 21/06 (2006.01)

Type

Patent

Patent number

CA 2607017

Description

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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