Method and apparatus for producing fiber pulp in a...

Details Method and apparatus for producing fiber pulp in a... Method and apparatus for producing fiber pulp in a...

D - Textiles, Paper

21

B

92/55

D21B 1/12 (2006.01) D21D 1/30 (2006.01)

Patent

CA 1063406

METHOD AND APPARATUS FOR PRODUCING FIBER PULP IN A STEAM-PRESSURIZED GRINDING APPARATUS ABSTRACT OF THE DISCLOSURE Method and apparatus for producing pulp from moisture-con- taining lignocellulosic material, such as wood chips, which is ground in a grinding space defined between a pair of grinding discs which rotate relative to one another in an environment of pressurized steam generated during the grinding process, in a clos- ed housing. The grist discharged from the grinding housing is pro- pelled by the accompanying steam into a cyclone, where the grist is separated from the steam for further treatment, while the steam is recycled for further use in the pulping process. The pressure in the cyclone is so controlled that a pressure is maintained therein which is substantially equal to a pressure drop which is sufficient merely to maintain the propellant force of the steam to convey the grist from the grinding housing to the cyclone while discharging the separated steam and recycling it for further use in the pulping process.

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