Controlling operation of a centrifugal pump

Controlling operation of a centrifugal pump

The operation of a centrifugal pump which pumps a liquid or suspension (e.g. 8-12 percent consistency) containing gas is controlled to minimize pump power consumption, or to vary the pump flow rate. The suspension is rotated within the pump so that a gas bubble is created at a central part of the pu...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: REPONEN, VOITTO, HARKONEN, ESKO, GULLICHSEN, JOHAN E, KUJALA, JAAKKO, NISKANEN, TOIVO
Format: Patent
Sprache:eng
Schlagworte:
BLASTING
HEATING
LIGHTING
MECHANICAL ENGINEERING
NON-POSITIVE DISPLACEMENT PUMPS
PAPER-MAKING
PERFORMING OPERATIONS
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS
PRODUCTION OF CELLULOSE
PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
SEPARATION
TEXTILES
TRANSPORTING
TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKINGMACHINE
WEAPONS
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Beschreibung
Zusammenfassung:The operation of a centrifugal pump which pumps a liquid or suspension (e.g. 8-12 percent consistency) containing gas is controlled to minimize pump power consumption, or to vary the pump flow rate. The suspension is rotated within the pump so that a gas bubble is created at a central part of the pump, and gas is discharged from the gas bubble, at a gas discharge pressure. The differential pressure between the suspension inlet and the gas discharge is determined, and the head and/or discharge flow rate of the pump are controlled by controlling the differential pressure so determined. The discharge flow rate may be maintained constant utilizing a control valve and flow meter in the pump discharge line, in which case controlling the discharge of gas from the gas bubble controls the head, and minimizes power consumption for a given flow rate. Alternatively the flow rate is controlled by controlling the gas discharge, with no control valve in the pump discharge line being provided.