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Apparatus for thickening and refining fibre-pulp suspensions
| Details |
Inventors: Berggren, Torsten L.;
Assignee: Thune-Eureka A/S (Lier, NO)
Primary Examiner: Bashore; S. Leon
Assistant Examiner: Hastings; K. M.
Attorney, Agent or Firm: Sughrue, Mion, Zinn, Macpeak and Seas
Apparatus for thickening, or de-watering, and refining fibre-pulpsuspensions include a screw-press thickener (1) and a refiner (2). In order to prevent air from entering the pulp and to provide a simpler arrangement, the outfeed end of the screw-press thickener (1) is connected directly to the infeed end of the refiner (2), therewith also to serve as an infeed screw to the refiner (2). In this respect the thickener (1) has a screening jacket (5) which embraces the screw (6). The screening jacket has at least one section which converges in the pulp feed direction, to achieve in the screw-press (1) a press effect required for de-watering the pulp while at the same time achieving the requisite reduction in diameter of the screening jacket (5) for connection to the refiner (2). |
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DETAILED DESCRIPTION I claim: 1.
Apparatus for thickening and refining fibre-pulp suspensions, comprising: a screw-press thickener (1) and a disc refiner (2), wherein a screw (6) of the thickener is surroundingly embraced by a screening jacket (5) having at least one section which converges in a feed direction to achieve a necessary compression effect for de-watering a fibre-pulb suspension in the screw-press and to reduce the diameter of the screening jacket, wherein a reduced diameter outfeed end of the screw-press thickener is directly connected to an inlet end of an unrestricted, substantially constant diameter infeed passage (7) of the refiner (2) leading to a central distribution cavity (8) within discs (12, 13) of the refiner, wherein the screw (6) of the screw-press thickener extends completely through said infeed passage (7) to positively feed the de-watered fibre-pulp suspension directly into the distribution cavity of the refiner, and wherein the screw has an inwardly tapering core within the infeed passage such that the effective cross-sectional area of said passage increases in the feed direction to facilitate the flow of the de-watered fibre-pulp suspension.
2.
Apparatus according to claim 1, wherein the screening jacket (5) of the thickener (1) is rotatable and arranged to rotate at a speed sufficiently high to obtain, as a result of centrifugal force, an effective draining through the jacket of free water present in the suspension and water pressed from said suspension.
3.
Apparatus according to claim 1 or claim 2, wherein the refiner is a twin-flow disc refiner (2) having a collecting chamber located peripherally around the discs.
4.
Apparatus according to claim 3, wherein the converging section of the screening jacket (5) is connected with a substantially cylindrical section (15) which is connected to the refiner (2).
5.
Apparatus according to claim 4, wherein said cylindrical section (15) has a fluid impervious cylindrical surface and extends into the infeed passage (7) of the refiner (2)
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Generators or Motors 
