Oil Separator unit
1. Oil Separator unit Application
The high-speed centrifugal separator is intended for marine and land applications. It is specifically designed for cleaning of mineral oils from water and solid particles (sludge). The cleaned oil is discharged continuously, while the sludge is discharged at intervals.
The separator handles the following types of lubricating oils and low viscosity fuel oils:
Distillate (viscosity 1.5-5.5 cSt/40℃)
Marine diesel oil (viscosity l3 cSt/40℃)
Intermediate fuel oil and heavy fuel oil (viscosity 30-380 cSt/50℃)
Lubricating oil of R & O type, detergent or steam turbine.
The separator can be operated either as a purifier or as a clarifier. When operated as a purifier the separator discharges the separated water continuously.
When the oil contains only small amounts of water the separator is operated as a clarifier, discharging the water together with the solid particles.
The separator has to be installed together with devices for control of its operation.
2. Oil Separator unit Design
The marine oil separator comprises a frame consisting of the frame lower part, the intermediate part and the frame top part with a frame hood.
The separator bowl is driven by an electric motor via a flat-belt power transmission and bowl spindle. The motor drive is equipped with a friction coupling to prevent overload.
The bowl is of disc type and hydraulically operated at sludge discharges. The hollow bowl spindle features an impeller which pumps closing water from a built-in tank to the operating system for sludge discharge.
The main inlets and outlets are shown with their connection numbers in the illustration.
3. Separation Principle and Separation Device of Oil Separator unit
The separator makes the oil, water or mechanical impurity of the compound with different specific gravity get different centrifugal force under the effect of centrifugal force field to complete the separation through high-speed rotation of the separation cylinder.
(1) Purification device
The purification plant is also called water diversion device which will generate three phases of oil, water and separation impurity. During operation, when the piston is sealed, the separation cylinder must be injected with water to form a water seal layer. The dirty oil runs into the separation cylinder through the hole at the bevel of the reel end, and a part of seal water is drained out, and then the pressure balance of the two different liquids with different density in the centrifugal force field is reached.
Then the dirty oil runs into the space between the discs through the hole on the bevel of the reel end, and is separated under the centrifugal force. The light oil flows to the center along the external surface of the disc, and is output by the centripetal pump. The heavy water and solid particle move outwards along the inner surface of the disc, continuously replacing the water of the water seal will enable the water to be thrown out from the caliber of the gravity ring and to be drained out from the sewage port.
After passing through the water seal layer, small amount of solid impurity will be taken away by the water, large amount of it will gather on the wall of the impurity basket and after waited for the machine stops by taking out a dregs basket row of dregs artificially.
(2) Clarification system
Clarifying system is also called impurity diversion device which will generate two phases of oil and impurity respectively after separation. During operation, the build-in impurity baffle ring of the ring channel on the coping of the disc will block the water outlet. So during impurity-diverting, water mustn’t be injected in for sealing, otherwise the separation effect will be affected, and great amount of oil spill will appear and the separating will be interrupted.
During impurity-diverting, only in the caliber of the gravity ring there is no water being thrown out, while the separation principle of the clean oil and impurity is identical with that of the purification device. Clean water is also output from the centripetal pump. After waited for the machine stops by taking out a dregs basket row of dregs artificially.
4. Oil Separator unit System Diagram
5. Certificates of Oil Separator unit: CCS, BV.
