Method and apparatus for discharge of whitewater
AssigneeVoith Paper Patent GmbH
InventorsWolfgang Mayer, Ralf Rziha
Life of this patent
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Abstract
In a method and an associated apparatus for discharging the whitewater from inside the loop of a continuous dewatering wire of a former, specifically a twin wire former in a paper machine the accumulating whitewater is collected by a collection tank, which is located within the loop; the collected whitewater is separated from the air, still inside the loop, by suctioning off of the area above the collection tank and the whitewater is removed from the collection tank through at least one channel that is connected to the collection tank and is located below the collection tank's water level.
Claims54
In a paper machine, a method for discharging whitewater from inside a loop of a continuous dewatering wire of a former, comprising the steps of:
- collecting accumulating whitewater by a collection tank which is located within the loop, said collection tank having a collection tank water level;
- separating the whitewater from air, still inside the loop, by suctioning off of an area above said collection tank;
- removing the whitewater from said collection tank through at least one closed channel which is connected to said collection tank below said collection tank water level, said at least one closed channel has a top surface below said collection tank water level;
- and
- adjusting a flow speed of the whitewater in said closed channel by selecting a difference between said collection tank level and a whitewater receptacle water level.
A device for discharging whitewater from inside a loop of a continuous dewatering wire of a former, said device comprising:
- a collection tank which is located within the loop, said collection tank having a collection tank water level;
- an essentially airtight hood located within the loop for separating the collected whitewater from the air;
- an exhaust system connected with said hood for suctioning off an area above a water level in said collection tank;
- at least one closed channel connected to said collection tank for removing the whitewater from said collection tank, said at least one closed channel being located below said collection tank water level, said at least one closed channel has a top surface below said collection tank water level;
- and
- a whitewater receptacle having a whitewater receptacle water level, said whitewater receptacle connected to at least one closed channel, the whitewater having a flow speed in said closed channel, said flow speed adjustable by selecting a difference between said collection tank water level and said whitewater receptacle water level.
Dependencies are inferred from the claim text.