B - Operations – Transporting – 04 – C
Patent
B - Operations, Transporting
04
C
B04C 5/04 (2006.01) B04C 5/081 (2006.01) D21D 5/24 (2006.01)
Patent
CA 2146093
A centrifugal cleaner is constructed so that its efficiency is less sensitive to consistency changes of the feed slurry, and so that it can operate at a higher consistency than conventional cleaners, yet optimizes separation efficiency. This is accomplished by disposing a turbulence generator in the tangential inlet to the cleaner, the turbulence generator comprising an abrupt cross-sectional area reduction (e.g, a cross-sectional area of about 0.1-0.3 times as large as the cross-sectional area of the inlet) so as to break up fiber flocs and present reformation of the flocs. Existing centrifugal cleaners can easily be retrofit by the method of the invention to achieve the invention's advantages by inserting a turbulence generator into the inlet of an existing centrifugal cleaner. The tangential inlet leads to a hollow main body which includes a vortex finder located in the body top. Preferably the vortex finder has a first diameter and the hollow body has a second diameter at a portion surrounding the vortex finder, the first diameter being about 0.25-0.4 times the second diameter. The vortex finder typically extends into the hollow body a first length from the top, the first length to first diameter ratio being about 2.5-3.5/1.
Ahlstrom Machinery Oy
Gowling Lafleur Henderson Llp
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