Apparatus and method for deaerating or degassing a paper stock suspension

US5268077A · kind A · utility

Assignee

• Sulzer-Escher Wyss GmbH · CH

Inventors

• Alfred Bubik · Ravensburg, DE
• Anton Gmeiner · Ravensburg, DE
• Walter Stein · Schwerin, DE

Key dates

• Filing date: Feb 26, 1992
• Grant date: Dec 7, 1993
• Expiry date: Feb 26, 2012

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D21D5/26
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

The stock stream of a pre-cleaned paper stock suspension is sub-divided into extremely small partial jets in a chamber of a compartment. Each such partial jet or stream has a throughflow volume of approximately 50 liters/min. to 80 liters/min. and is directed with great turbulence against an impact wall within the closed chamber of the compartment at jet velocities in the order of about 10 m/sec. to 12 m/sec. and at an absolute pressure of about 0.5 to 0.8 bar absolute, the partial jets then being completely sprayed at such impact wall. The paper stock suspension which is to be deaerated has as large as possible surface area, so that the air is efficiently released at a negative pressure or vacuum of approximately 0.05 bar prevailing in the chamber and then can be suctionally removed. The division of the stream of the paper stock suspension into partial jets is accomplished by a distributor through which extends a predetermined number of throughflow openings defined by bores. The throughflow openings each have, for example, the shape of a stepped constricting or widening diffusor. Turbulence-generators can increase the action of the stepped diffusors.