Discharge from pulping vessels without the aid of mechanical agitation

USH1681H · kind H · statutory invention registration

Assignee

• Ahlstrom Machinery, Inc. · US

Inventors

• Jerry R. Johanson · San Luis Obispo, US
• J. Robert Prough · Glens Falls, US
• J. Wayne Chamblee · Queensbury, US

Key dates

• Grant date: Oct 7, 1997

Classification

• Technology area (CPC —): General

Abstract

A continuous digester discharges pulp without mechanically engaging the pulp, by using one or more discharge transitions with one dimensional convergence and side relief. The transitions may be mounted within a pre-existing digester shell (after removal of the discharge rotor), and supported by a number of braces and/or a skirt shaped like a truncated cone. The operation of a digester, or other continuous vessel, may be controlled by automatically sensing the level of comminuted cellulosic fibrous material in the vessel and automatically controlling the introduction of dilution liquid into the vessel to discharge the material from the vessel in response to the sensing.