Liquid purification or separation – Processes – Including controlling process in response to a sensed condition
Patent
1998-01-21
2000-12-26
Savage, Matthew O.
Liquid purification or separation
Processes
Including controlling process in response to a sensed condition
210 90, 210 97, 210143, 210499, C02F 100, C02F 126
Patent
active
061653705
ABSTRACT:
A screening system includes a pressure screen which receives a liquid/solid suspension and filters the suspension to provide an accept portion and a reject portion. The pressure screen includes a housing which encloses a chamber containing a screen basket through which a portion of the liquid/solid suspension passes from a first side of the basket to a second side to form the accepts. A pressure sensor monitors the pressure differential between the first side and the second side and provides a sensed differential pressure signal indicative thereof. The system also senses the accept flow rate and provides a signal indicative thereof to a controller. The controller sets a differential pressure threshold value as a function of the accept flow rate signal and monitors the sensed differential pressure signal. If the sensed differential pressure signal exceeds the threshold value, the controller automatically initiates corrective action in order to reduce the differential pressure across the screen.
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Fleming Michael
Savage Matthew O.
Voith Sulzer Paper Technology North America Inc.
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