Refiner plate with interspersed surface and subsurface dams

Details Refiner plate with interspersed surface and subsurface dams Refiner plate with interspersed surface and subsurface dams

1999-04-16

2000-03-07

Husar, John M.

Solid material comminution or disintegration

Apparatus

Cooperating comminuting surfaces

241296, 241297, B02C 712

Patent

active

060328886

ABSTRACT:
A refiner plate for the face of a refiner disc comprising a plurality of refiner segments arranged side-by-side on the face of the disc to form a substantially annular refining region. Each refiner segment has an inlet zone for receiving the material to be refined, an outer zone for refining and discharging refined material and an intermediate refining zone disposed intermediate the inlet zone and the outer zone. The outer zone has a pattern including a plurality of radially disposed bars defining an upper surface, a plurality of radially disposed grooves disposed intermediate the bars defining a lower surface, and dams traversing each of the grooves for restricting radial flow through the respective grooves. The dams include full height dams extending from the lower surface to the upper surface and partial height dams extending from the lower surface to a height intermediate the lower and upper surfaces. At least one full height dam is disposed in each of the grooves, as the radially outermost dam. The grooves containing a combination of full height dams and partial height dams are generally alternated with grooves containing only full height dams, thereby providing an optimized functionality across the outer zone to enhance the flow of steam while retarding the flow of material.

REFERENCES:
patent: 1131272 (1915-03-01), Reynolds
patent: 4676440 (1987-06-01), Perkola
patent: 4953796 (1990-09-01), Virving
patent: 5373995 (1994-12-01), Johannson
patent: 5893525 (1999-04-01), Gingras

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