Patent ID: 6375795
Filing Date: 2002-04-23
Classification: D21C

Abstract:
A feed system for a digester in a pulp mill, comprising:a pressure isolation device having an inlet into which comminuted cellulosic fibrous material is fed at a first pressure, and an outlet from which the material is discharged at a second pressure, greater than the first pressure; a superatmospheric pressure treatment vessel having a material inlet connected to said outlet of said pressure isolation device, and a material outlet; a gas discharge outlet from said pressure isolation device separate and distinct from said material discharge outlet; a pressurized fluid introduction port in said pressure isolation device, said port remote from said gas discharge outlet and closer to said material discharge outlet of said pressure isolation device than is said gas discharge outlet; a conduit connected to said gas discharge outlet; and a pressurizing device, which pressurizes gases, connected to said conduit.