Patent ID: 7497927

Claim:
An arrangement for the addition and withdrawal of fluids to a digester, comprising: the digester having an inlet and an outlet defined therein, the digester being used for continuous cooking of cellulose pulp where wood chips are continuously fed through the inlet at a top of the digester and cooked cellulose pulp is continuously output through the outlet at a bottom of the digester, the digester having a lowermost strainer section disposed at the bottom of the digester, the lowermost strainer section having a strainer surface arranged along a circumference of an inner wall of the digester, an extra strainer section disposed above the lowermost strainer section inside the digester, the extra strainer being spaced away from the lowermost strainer section so that a gap is defined therebetween in a gap segment of the digester, the lowermost strainer section and the extra strainer section being adapted for withdrawing consumed cooking fluid, the gap being less than a diameter of the bottom of the digester, a plurality of nozzle means, disposed in the gap around the circumference of the inner wall of the digester, for continuously providing a dilution fluid or a washing fluid onto a column of pulp disposed in the gap of the digester, the plurality of nozzle means being directed radially inwardly, nozzles, for the addition of dilution fluid or washing fluid, arranged under the lowermost strainer section and between the lowermost strainer section and the outlet, and a pump in fluid communication with the nozzle means.