Method and apparatus for controlling a dryer

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

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F26B 21/12 (2006.01) B27K 5/00 (2006.01) F26B 3/00 (2006.01) F26B 13/00 (2006.01) F26B 15/12 (2006.01) F26B 21/02 (2006.01) F26B 25/00 (2006.01)

Patent

CA 2206248

A method and apparatus for operating a dryer used to reduce the moisture content of sheet material such as a jet veneer dryer. A drying chamber includes a plurality of individual, juxtaposed drying sections (16). A single point exhaust system (34) extracts the exhaust from a first drying section. A wet seal section (40) located at an input end of the dryer includes an exhaust passage through which a gas sample is drawn by a sampling fan (100). A controller monitors the temperature of the sampled gases (at 110) and ambient air (at 112) and adjusts the rate of exhaust flow from the single point exhaust system (34) as a function of the temperature differential.

Procédé et appareillage de commande d'un séchoir servant à réduire le taux d'humidité de produits en feuilles, par exemple un séchoir à tuyères pour bois de placage. Une enceinte de séchage comporte plusieurs compartiments de séchage (16) distincts juxtaposés. Un système d'évacuation monopoint (34) évacue le gaz d'un premier compartiment de séchage. Une chambre d'étanchéité humide (40) située à l'extrémité d'entrée du séchoir comprend un passage d'évacuation à travers lequel un échantillon de gaz est aspiré par un ventilateur (100) d'échantillonage. Un régulateur contrôle la température des gaz échantillonnés (au point 110) et de l'air ambiant (au point 112) et ajuste le débit d'évacuation du système d'évacuation monopoint (34) en fonction du différentiel de température.

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