Method and arrangement for circulating water in a paper machine
AssigneeValmet Corporation
InventorsMarkku Karlsson, Antti Suonperä, Rainer Gartz, Sakari Kaijaluoto
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Abstract
A method in a paper machine for arrangement of water circulation therefor and arrangement of a water circulation system in a paper machine. In view of full or partial closing of the water circulations in a paper machine, the wash water flows from the fabrics and from other devices in the paper machine as well as the water drained from the paper web to be produced are recovered selectively based on the place of origin thereof in the paper machine. At least a part of the recovered different water flows are cleaned, and the cleaned water flows are recirculated to applications of reuse suitable in view of their washing potential in the papermaking process.
Claims17
A method for circulating and cleaning water in a paper machine, comprising the steps of:
- recovering wash water from fabrics and other devices in the paper machine and water drained from a paper web to be produced in the paper machine in a plurality of distinct and separate water flows, each one of said plurality of distinct and separate water flows originating at a different location in the paper machine and having a corresponding water quality dependent on said different location in said paper machine,
- cleaning at least some of said plurality of distinct and separate water flows to produce a plurality of cleaned water flows, and
- recirculating said cleaned water flows to a selected application of reuse in the paper machine based on said water quality.
Dependencies are inferred from the claim text.