Apparatus and method for processing white water in a paper machine
AssigneeValmet Aktiebolag
InventorsElin Engqvist, Leif Videgren
Life of this patent
Estimating the term…
Abstract
Aspects provide for a Whitewater processing system suitable for managing an ejected Whitewater spray during operation of a paper or board making machine. A de-air system may provide for improved removal of air from the Whitewater. A calming system may reduce turbulence in a liquid flow, reducing turbulence in the flume. The de-air system and calming system may be disposed together or separately. Certain aspects may be implemented with a turbine (e.g., used to generate electricity from the Whitewater spray). Some aspects may provide for improved handling of variable spray velocities.
Claims21
A de-air system for processing a whitewater spray ejected through a forming wire of a paper machine having a frame and a machine direction, the de-air system comprising:
- channels defined by walls shaped to direct a portion of the whitewater spray away from the machine direction, the channels open at entrances proximate to the forming wire and terminating at liquid outlets of the de-air system;
- and
- air outlets providing for air evacuation from the channels;
- wherein the channels are configured such that at least one of:
- a) between the respective entrances and liquid outlets of the de-air system, and excluding the air outlets, there is no substantial fluid communication between the channels;
- b) the walls comprise side walls for which a majority of the side walls is within 10 degrees of vertical;
- or
- c) less than 5% of a cross-sectional area of the channels is intersected by a free upstream end of a component that disrupts flow through the channels.
Dependencies are inferred from the claim text.