Method for arrangement of the water circulation in a paper mill

Details Method for arrangement of the water circulation in a paper mill Method for arrangement of the water circulation in a paper mill

D - Textiles, Paper

21

F

D21F 1/66 (2006.01)

Patent

CA 2255796

The invention concerns a method for arrangement of the water circulation in a paper mill, which paper mill comprises a pulp manufacturing plant provided with a water circulation system, such as a TMP plant, and a paper machine provided with a water circulation system. In the invention, in view of reducing the amount of fresh water supplied to the paper mill, a part of the amount of fresh water supplied to the paper mill is substituted by water or waters cleaned locally from waters contaminated at the paper mill. The concentrate or concentrates obtained from the stages of water cleaning is/are utilized where applicable by arranging said concentrate(s) to flow upstream in relation to the raw-material flow for reuse at the paper mill. By means of these operations the level of the amounts of interfering substances circulating in the paper mill is controlled.

L'invention a trait à un procédé relatif au mécanisme de circulation d'eau dans une papeterie comprenant une installation de fabrication de pâte à papier pourvue d'un système de circulation d'eau, installation du type à pâte thermomécanique (PTM), ainsi qu'une machine à papier, également pourvue d'un système de circulation d'eau. Dans le cadre de cette invention, afin de réduire les quantités d'eau alimentant la papeterie, un partie de l'eau douce est remplacée par de l'eau ou des eaux épurées sur place, à partir de l'eau polluée dans la papeterie elle-même. On utilise le ou les concentrats issus des différentes étapes du processus d'épuration de l'eau là où cela se peut en les faisant s'écouler en amont par rapport au flux des matières premières en vue d'un réemploi dans la papeterie. L'ensemble de ces opérations permet d'agir sur les quantités de substances perturbantes circulant dans la papeterie.

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