Paper making and fiber liberation – Apparatus – With beating – refining – and/or disintegrating means
Patent
1984-10-29
1987-09-08
Alvo, Steve
Paper making and fiber liberation
Apparatus
With beating, refining, and/or disintegrating means
60648, 162 23, 162 28, 162 46, 162 47, 241244, D21C 1106, D21D 100
Patent
active
046922148
ABSTRACT:
In the production of mechanical pulp, a refiner (defibrator) is driven by a steam turnine. The steam supply for the turbine comprises process steam generated in the refiner during the refining action, which steam is preferably passed through a reboiler. Some make-up energy is necessary to provide all of the power for driving the refiner, the make-up energy being preferably provided by clean steam from an accessory source introduced to the turbine by a steam ejector. A portion of the process steam, and the steam discharge from the turbine, can be used for presteaming the chips (comminuted cellulosic fibrous material) before introduction into the refiner. Any condensate from the turbine may be fed to the reboiler. Reduction gears are provided between the turbine and the refiner drive shaft so that the refiner is driven at optimum rpm for the particular material being treated. A wide variety of other structures, such as a mechanical steam compressor, and hydraulic units, can be utilized to obtain optimum desired characteristics.
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Lahner et al, Pulp and Paper Magazine, Jun., 1981 (reprint of Jul., 1982), entitled "High TMP Refiner Consistencies . . . ".
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Alvo Steve
Kamyr AB
LandOfFree
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