Patent ID: 8647473

Claim:
A continuous digester for producing pulp from comminuted cellulosic material, comprising, a vertically extending cylindrical digester vessel, a feeder disposed at an upper end of the vessel, a pulp discharge having an outlet defined therein at a lower end of the vessel, addition means for adding liquid (DL) in a lowermost part of a vessel wall, the vessel having a rotatable bottom scraper arranged at a center and bottom of the vessel, the scraper being in operative engagement with a vertical drive shaft for assisting in out-feed of pulp from the vessel, the bottom scraper having a cone diverter fixedly arranged to and co-rotatable with the bottom scraper, the cone diverted being located above the bottom scraper, the outlet being co-axially arranged about the vertical drive shaft, an upper inclined surface of the cone diverter having an inclination angle (α) in a range of 30±10 degrees relative to a vertical axis (CL), the upper inclined surface having draining apertures defined therein in fluid communication with a liquid receiving chamber (CC) disposed inside the cone diverter, and the liquid-receiving chamber being connected to a drainage channel, the liquid-receiving chamber extending to an exterior of the vessel.