Importance

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Abstract

In a method of operating a centrifugal separator, the centrifugal separator includes a centrifuge bowl arranged to rotate around an axis of rotation and in which the separation of a liquid mixture takes place; a stationary frame which defines a surrounding space in which the centrifuge bowl is arranged; and a drive member configured to rotate the centrifuge bowl in relation to the frame around the axis of rotation. The centrifuge bowl includes an inlet for receiving the liquid mixture to be separated, at least one liquid outlet for discharging a separated liquid phase and an intermittent discharge system for discharging a separated sludge phase from the centrifuge bowl. The method includes supplying a liquid feed mixture to be separated to the inlet of the centrifuge bowl; separating the liquid feed mixture into at least one separated liquid phase and a separated sludge phase; and supplying hydraulic fluid to the intermittent discharge system to initiate discharge of a separated sludge phase from the centrifuge bowl. The amount of supplied hydraulic fluid is determined by the magnitude of a generated trigger signal Tgen and the magnitude of the generated trigger signal Tgen is dependent on the air pressure around the centrifuge bowl.

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First Claim