Method and cooker for continuous cooking of cellulose wadding material

摘要

The digester and method are for the continuous cooking of pulp. At least two withdrawal positions ( 11 E, 11 D) for cooking fluid are arranged at different heights in the digester ( 10 ). The cooking fluid in the first and second position is withdrawn after the chips have had a retention time that differs by at least 10 minutes. The differential pressure between the positions is determined and when this exceeds a pre-determined level, a connection ( 17 E) opens between these positions, establishing a flow parallel to a flow of cooking fluid between these positions in the digester. Several withdrawal positions are preferably connected in a common shunt system ( 17 A- 17 F), with valves ( 18 A- 18 F), controlled by the differential pressure, that are located between adjacent positions.