D - Textiles – Paper – 21 – D
Patent
D - Textiles, Paper
21
D
92/41, 60/45
D21D 1/00 (2006.01) D21C 11/06 (2006.01) D21F 7/02 (2006.01)
Patent
CA 1245088
ABSTRACT OF THE DISCLOSURE In the production of mechanical pulp, a refiner (defibrator) is driven by a steam turbine. 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. To increase efficiency, the system can be used in association with a boiler for the co- production of electricity and steam. Process steam from the defibrator, after passing through the reboiler, is super heated by a heat exchanger associated with the boiler. The boiler provides energy for driving a turbine connected to an electric generator, as well as providing additional steam input to the steam turbine for driving the refiner.
494162
Bereskin & Parr
Kamyr Ab
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