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 bleachingline, 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 arrangedafter the first and the second bleaching step, respectively, and in which washliquor 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, issupplied by means of a main conduit (1), wherein - each one of said washapparatuses (W4, W5) is independently supplied by means of first branchconduits (L1,L3) connected to said main conduit (1), - each one of said washapparatuses (W4, W5) independently bleeds out wash filtrate by means of secondbranch conduits (L2,L4)connected to said main conduit (1), and said mainconduit has an outlet end (10) which bleeds out at least some of said washfiltrate from said wash apparatus (W4, W5).