Patent ID: 8795468
Filing Date: 2014-08-05
Classification: D21C

Abstract:
1. A method for the impregnation of chips during the manufacture of chemical pulp, comprising; continuously feeding chips without preceding steam treatment to a top of an impregnation vessel, feeding out impregnated chips from a bottom of the impregnation vessel, adding hot impregnation fluid (BL), at a first temperature above a boiling point of the hot impregnation fluid, to the impregnation vessel, via a pipe having an outlet end located below a chip level (CHLEV) established in the impregnation vessel and at a distance from walls of the impregnation vessel, the hot impregnation fluid (BL) releasing steam into a chip volume for steaming the chips, the added impregnation fluid (BL) establishing a fluid level (LIQLEV) in the impregnation vessel, the chip level (CHLEV) being above the fluid level and the top of the impregnation vessel having a pressure that is essentially at atmospheric pressure, withdrawing spent impregnation fluid (REC), at the fluid level (LIQLEV), from a withdrawal volume located behind screens mounted in a wall of the impregnation vessel, adding an additional fluid (REC leading the steam towards the chips below the chip level (CHLEV) for steaming the chips.