Patent ID: 6464826
Filing Date: 2002-10-15
Classification: D21B,Y02P

Abstract:
A method for the treatment of wood chips comprising preheating said wood chips in a preheater in the presence of steam thereby producing preheated wood chips and volatile organic substances from said wood chips, mechanically processing said preheated wood chips in a beater whereby wood fibers are released from said wood chips and said steam and said volatile organic substances are contained therein, feeding size to said wood fibers, separating said wood fibers from said steam and said volatile organic substances in a cyclone including an inlet, an upper outlet and a lower outlet, transporting said wood fibers, said steam, said size, and said volatile organic substances from said beater to said inlet of said cyclone through a blower line, carrying said wood fibers from said lower outlet of said cyclone through a drying conduit, controlling said removal of said wood fibers from said cyclone through a sluice valve associated with said lower outlet of said cyclone, and processing said steam and said volatile organic substances from said upper outlet of said cyclone, whereby said volatile organic substances separated in said cyclone are separated, and heat associated with said steam separated in said cyclone is recovered.