| 摘要 |
Apparatus for relieving blockage of the pulp discharge passage in a cyclone separator included in a pulping system. The pulp stock is treated in an environment of superatmospheric steam and discharged together with the steam into the separator cyclone. The separated processing steam is evacuated from the cyclone while the steam liberated pulp stock is propelled through a throat which tapers towards the discharge valve by a screw conveyor whose flights are contoured to rotate snugly within the tapered throat. The discharge valve is controlled to maintain a predetermined rate of discharge and a predetermined superatmospheric pressure within the cyclone to allow evacuation of steam therefrom. The shaft of the screw conveyor is reciprocally mounted in the cyclone to allow the screw flights to yield in response to a predetermined excessive thrust resulting from compacted pulp stock blocking the throat, to provide a by-pass between the screw flights and the throat wall and thereby relieve the blockage. The invention may also include sensor means for controlling the rate of discharge in response to variations in thrust on the compacted pulp stock by the screw conveyor. |
