PULP DIGESTOR WITH POLYGONAL SCREEN FORMING SEALED VOLUME INSIDE DIGESTOR FOR ISOTHERMAL CONTINUOUS COOKING THROUGHOUT DIGESTOR

摘要

Continuous upright fibrous material digester, has top input for material and cooking liquor and a bottom liquor withdrawal screen below at least one lower half further screen having at least one screen element (2A) of angular shape, for preference rectangular and square of area below 1 m2. The screen face (3A) of the element is attached to the digester wall (1A) in manner to form a sealed vol. (V) with an inlet and outlet pipe (15) through the wall (1A). Pref. the element (2A) is assembled by welding and mounted in the wall (1A) by welding (9), and is on bars (4) supported by shoulders (7).