Importance

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Abstract

A solid bowl decanter centrifuge comprising a solid, generally cylindrical bowl having a liquids outlet at one end and a solids outlet at the other end. A drive for rotating the bowl at a first speed. Inlet pipework for introducing influent to the interior of the bowl and a feed valve in the inlet pipework for controlling the rate of flow of influent therethrough. A scroll conveyor mounted for rotation within the bowl at a second speed. A hydraulic motor whose body is connected to the bowl and whose output shaft is connected to the scroll conveyor whereby the motor speed determines the differential speed of the conveyor relative to the bowl. The hydraulic motor has a hydraulic drive system which includes a pump for supplying hydraulic fluid to the motor. A primary control system is adapted to monitor the hydraulic pressure in the hydraulic drive system for the hydraulic motor and to regulate in a known manner the displacement of the pump so as to maintain a predetermined relationship between conveyor speed and the pressure in the hydraulic drive and hence between the conveyor speed and the conveying torque. A secondary control system responds to the flow rate in the hydraulic drive of the motor to control the feed valve opening state such as to maintain the flow rate in the hydraulic drive, and hence the conveyor speed and the rate of discharge of solid material, at a substantially constant predetermined value.

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First Claim