METHOD FOR WASHING PULP IN A BLEACHING LINE AND A BLEACHING LINE

摘要

This invention relates to a method of bleaching cellulose pulp in a bleaching line, having at least two bleaching steps comprising a first (D1) and a second (D2) bleaching step, as seen in the direction of flow of the cellulose pulp, which bleaching steps have wash apparatuses (W4. W5) for the pulp arranged after the first and the second bleaching step, respectively, and in which wash liquor and where appropriate dilution liquor is led in principle in counter-current to the pulp flow through the bleaching steps in the bleach line, wherein that a substantial portion of the wash liquor, or all of it, is supplied by means of a main conduit (1), wherein - each one of said wash apparatuses (W4, W5) is independently supplied by means of first branch conduits (L1,L 3) connected to said main conduit (1), - each one of said wash apparatuses (W4, W5) independently bleeds out wash filtrate by means of second branch conduits (L2,L4) connected to said main conduit (1), and said main conduit has an outlet end (10) which bleeds out at least some of said wash filtrate from said wash apparatus (W4, W5).