Patent ID: 8366875

Claim:
A method for the improvement of a wash after a completed digestion process in a continuous digester for a production of cellulose pulp, comprising: digested softened chips passing a final strainer section at a bottom of the digester, feeding out the digested softened chips under an influence of a bottom scraper arranged at the bottom of the digester; passing the digested softened chips through a bucket-shaped outlet tap at the bottom of the digester and onwards to an outlet line connected to the outlet tap; establishing a pressure drop across a blow-valve, arranged in the outlet line, of at least 0.5 bar and at most 3 bars, the pressure drop defibrating the digested softened chips, establishing a displacement wash in a flow of the digested softened chips through the outlet line, subjecting the digested softened chips to the displacement wash after the digested softened chips having passed through the outlet tap, and the digested softened chips passing through the blow-valve.