Apparatus, and method for controlling consistency
AssigneeGeneral Signal Corporation
InventorDavid N. Greey
Life of this patent
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Abstract
Consistency of slurries such as paper pulp stock is controlled by ultrasonically measuring the flow of the slurry (the velocity of the particles therein) as the slurry is agitated by an impeller which induces circulation thereof within a region in a tank containing the slurry. Dilutant is added under the control of the measurement and a mixed slurry of desired consistency is obtained, respectively at an inlet and an outlet in communication with the region of the tank where flow is being induced and measured. Consistency control is obtained in the containing vessel or tank with greater accuracy and at lower cost than in apparatus where consistency is measured outside of the vessel containing the slurry.
Claims16
Apparatus for controlling the consistency of a slurry containedin a tank which comprises an agitator for producing a flow of said slurry in said tank, liquid velocity sensor means for sensing said flow, said sensor being located adjacent to a surface of the tank at a region where said slurry flow is linear, means for providng an output corresponding to the sensed flow, and means responsive to said output for varying the dilution of said slurry to control the consistency thereof.
The method of controlling the consistency of slurries such as paper stock and the like, which comprises the steps of agitating the slurry to produce a circulating flow thereof in the tank containing the slurry, measuring the flow of said slurry adjacent to a surface of the tank at a region where said flow is linear, in response to the flow measurement adding makeup material into said region and removing said slurry from said region while measuring said flow so as to maintain a predetermined consistency in the slurry which is removed from said tank.
Apparatus for the measurement of the consistency of a slurry contained in a vessel comprising an agitator for producing a circulating flow of said slurry in said vessel, means for detecting the velocity at which said slurry flows in said vessel said detecting means being located adjacent to a surface of the tank at a region where said slurry flow is linear, means for providing an output corresponding to the detected flow, and means for deriving from said output a measurement of the consistency of said slurry.
The method for measurement of consistency of a slurry in a tank which comprises the steps of agitating said slurry with an impeller to produce a circulating flow of said slurry in a said tank, then detecting the velocity at which said slurry flows adjacent to a surface of the tank at a region where said flow is linear, and deriving a measurement of consistency from said velocity.
Dependencies are inferred from the claim text.