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Automatic Decanter Centrifuges
,Ex Proof Decanter Centrifuges
,Decanter Centrifuges For Extraction
The Three Phase Decanter Centrifuge for Refinery Slop Oil Recovery is designed for continuous separation of recovered oil, water, and concentrated solids from refinery slop streams.
It is suitable for slop oil collected from tank drains, desalter operations, equipment cleaning, process upsets, oily wastewater systems, and off-spec hydrocarbon recovery.
- Refinery slop oil recovery
- Desalter sludge treatment
- Oily drain and sump sludge separation
- API separator sludge treatment
- Off-spec oil recovery
- Tank drain sludge processing
- Refinery cleaning waste treatment
- Oily wastewater pretreatment
- Hydrocarbon recovery before DAF
- Hazardous sludge volume reduction
Stable Oil-Water Emulsions
Surfactants, fine solids, asphaltenes, and process chemicals may stabilize the emulsion.
Heating, demulsifier dosing, and controlled mixing can improve separation.
Variable Feed Composition
Oil, water, and solids content may change between batches or during one recovery operation.
Adjustable bowl speed, differential speed, feed rate, and phase interface help maintain stable performance.
High Viscosity
Heavy hydrocarbons and wax can reduce fluidity.
Feed heating or controlled dilution may be required before centrifugation.
Abrasive and Sticky Solids
Rust, sand, coke, catalyst fines, and heavy sludge can cause wear or unstable solids discharge.
Wear-resistant scroll protection and high-torque conveying can be provided.
Salts and Process Chemicals
Slop oil may contain chlorides, treatment chemicals, acids, or alkaline residues.
Wetted materials and seals should be selected according to the actual liquid composition.
Refinery Slop Oil Recovery Solution
Peony provides continuous three-phase separation solutions for hydrocarbon recovery, water separation, sludge concentration, and downstream treatment preparation.
Refinery Slop Oil
→ Coarse Screening
→ Heated Agitated Tank
→ Optional Demulsifier Dosing
→ Three Phase Decanter Centrifuge
→ Recovered Oil + Separated Water + Concentrated Solids
Recovered Oil
→ Oil Tank
→ Reprocessing / Blending / Further Purification
Separated Water
→ API Separator / DAF / Biological Treatment
Concentrated Solids
→ Thermal Treatment / Further Dewatering / Controlled Disposal
Peony Can Provide
- Slop oil testing and centrifuge selection
- Screening and heated feed tank
- Controlled feed pump
- Demulsifier dosing system
- Adjustable bowl and differential speed
- Adjustable oil-water interface
- Wear-resistant internal components
- Gas-tight and explosion-proof design
- Nitrogen protection and vapor connection
- PLC and VFD automatic control
- Oil, water, and solids collection system
How the Decanter Centrifuge Works
1. Conditioned Slop Oil Feeding
Screened and heated slop oil enters the rotating bowl through a controlled feed pipe.
Agitation and optional demulsifier dosing maintain a uniform feed and improve phase separation.
2. Solids Sedimentation
High centrifugal force moves rust, sand, coke fines, and other dense solids toward the bowl wall.
The solids form a concentrated outer layer.
3. Oil-Water Separation
The lighter oil phase remains closer to the bowl center.
The heavier water phase forms a separate outer liquid layer.
4. Continuous Solids Conveying
The screw conveyor transports settled solids toward the conical end.
Concentrated solids discharge continuously through protected outlets.
5. Separate Oil and Water Discharge
Recovered oil and separated water leave through independent liquid outlets.
The oil is sent for reprocessing, while the water continues to refinery wastewater treatment.
| Model | Diameter (mm) | Length (mm) | Length-to-diameter rate | G force | Max solid discharge (m³/h) | Weight (kg) | Dimension (L*W*H) (mm) |
|---|---|---|---|---|---|---|---|
| PDC-10 | 250 | 1000 | 4 | 4080 | 0.4 | 1000 | 2410*800*1080 |
| PDC-12 | 4200 | 1350 | 4 | 3500 | 0.6 | 1200 | 2610*800*1080 |
| PDC-12 | 4200 | 1350 | 4.5 | 3180 | 1.2 | 1800 | 3495*840*1180 |
| PDC-18 | 4000 | 1600 | 4.5 | 3180 | 1.2 | 3200 | 3497*1020*1385 |
| PDC-18 | 450 | 2150 | 4 | 2500 | 2 | 3800 | 4447*1080*1385 |
| PDC-20 | 400 | 2250 | 4.5 | 2500 | 3.5 | 4000 | 4580*1140*1470 |
| PDC-21 | 530 | 2280 | 4.3 | 2500 | 5 | 5000 | 4924*1170*1540 |
| PDC-26 | 655 | 2800 | 4.3 | 2270 | 8 | 7000 | 4300*1900*1350 |
Main Advantages
Simultaneous Three-Phase Separation
Recovered oil, separated water, and concentrated solids are produced continuously.
Higher Hydrocarbon Recovery
Conditioned separation reduces valuable oil loss in refinery sludge and wastewater.
Reduced Sludge Volume
Concentrated solids require less storage, transport, and final treatment.
Flexible Feed Handling
Operating parameters can be adjusted for changing oil, water, and solids ratios.
Safe Closed Operation
Gas-tight, explosion-proof, and nitrogen-protected configurations are available.
Please provide:
- Oil, water, and solids percentages
- Feed temperature and viscosity
- Particle size and abrasive content
- Required processing capacity
- Oil recovery and water-quality targets
- Hazardous-area and downstream requirements
Can refinery slop oil be returned directly to the crude unit?
Not always. Water, sediment, salt, sulfur, and contaminant levels should be tested before blending or reprocessing.
Is demulsifier dosing always required?
No. It depends on emulsion stability, solids content, temperature, and oil-water separation performance.
Can the centrifuge treat desalter sludge?
Yes. The feed should be evaluated for salts, solids, viscosity, corrosion risk, and emulsion stability.
How is fluctuating oil-water ratio controlled?
Feed equalization, adjustable phase interface, bowl speed, and flow control help maintain stable separation.
Can the separated water go directly to biological treatment?
Usually only after further oil and solids removal. API separation, DAF, or another pretreatment stage may be required.
Peony welcomes distributor and agent cooperation with refineries, oil terminals, slop oil processors, hazardous-waste companies, tank-cleaning contractors, and oily-wastewater treatment partners.
We support partners with slop oil testing, three-phase decanter selection, heating and demulsifier design, wear protection, gas-tight configuration, commissioning, spare parts, and after-sales service.
Send us your slop oil data, including oil-water-solids ratio, viscosity, temperature, required capacity, recovery target, and safety requirements. Our engineering team will recommend a suitable three-phase decanter centrifuge solution.
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