ARRANGEMENT, SYSTEM AND METHOD FOR TREATMENT OF CELLULOSE PULP

摘要

The invention relates to a an arrangement (100) for screening of cellulose pulp in several stages comprising at least two screening means (4, 8) within the same apparatus which are enclosed by a housing (1). The arrangement comprises a main inlet (11) for input of pulp to the screening arrangement, at least one outlet (26) for output of an accept fraction of pulp from the screening arrangement and at least one outlet (15, 27) for output of a reject fraction. The arrangement further comprises a first screening chamber (9) receiving pulp from the main inlet (11) for input of pulp, a first accept chamber (12) receiving pulp passing through a first screening means (4) and a second screening chamber (16) receiving pulp at least from the first accept chamber (12) before screening through a second screening means (8), where the screening arrangement comprises a secondary pulp inlet (17) for input of pulp from at least one subsequent screening arrangement (200, 300) to be screened through the second screening means (8) only. The invention further relates to a system and a method for screening where accept fractions (A3, A4) from at least one subsequent screening arrangement (200, 300) is returned through the secondary pulp inlet (17) to be screened through the second screening means (8) of the screening arrangement (100).