METHOD FOR DISCHARGING A DIGESTER

摘要

A method for discharging cooked lignocellulose materials from a digester is disclosed. After batch cooking the lignocellulose material in the digester is cooled to a temperature of about 100 DEG C., preferably from 100 DEG to 120 DEG C., a gas is supplied to the upper portion of the digester to provide a gas pressure such that the combination of that gas pressure and the static pressure in the digester created by the height of cooked lignocellulose material therein exceeds by no greater than about 200 kPa the sum of the pressure required to overcome the level difference between the exit port at the bottom of the digester and an entrance port in the upper portion of a receiving vessel and the flow resistance required to transfer the cooked lignocellulose material therethrough.