| 摘要 |
Upon use of a nozzle centrifuge for separating oil, water and sand from a mixture thereof separated water and sand is continuously removed through nozzles (12), which are arranged at the periphery of the rotor of the nozzle centrifuge. Separated oil is discharged through a central outlet (13-15) in the rotor. Through a space (17) in the rotor, which communicates with the radially outer part (7b) of the rotor separating chamber (7), water may either be supplied under pressure to the rotor or be discharged from the rotor for maintaining an interface layer, which is formed in the separating chamber (7) between separated oil and separated water, at a predetermined radial level (22). A supply device (23-25) and a discharge device (26, 27) are adapted to supply to the rotor and discharge from the rotor, respectively, only so much water that is required for said purpose. The discharge device (26, 27) is separated from the supply device (23-25), so that discharged water need not be subjected to the pressure generated by or maintained in the supply device (2325).
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