Valmet Ab

Per Eriksson

Örjan Ahlgren

Per Nyberg

Per Wallin

Mattias Grannas

A system () for refining lignocellulosic biomass material (A) comprising a presteaming bin (), a dewatering device (), a preheater (), a defibrator () comprising at least one refining zone () wherein steam is generated during refining of said biomass material so that a pressure peak occurs, a blowpipe (), and a first steam flow path (D) arranged to convey steam from said refining zone to said presteaming bin (). The system further comprises a second steam flow path (E) arranged to convey steam from said refining zone to said presteaming bin, wherein said first and second steam flow paths are connected to the refining zone on opposite sides of the pressure peakin a biomass material transport direction, and wherein said first and second steam flow paths are separate from said blow pipe. The invention also relates to a process for refining lignocellulosic biomass material.

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Alnö, Sweden

Per Eriksson