Heavy-Residue Industrial Decanter Centrifuge for Tar Sludge Separation

Heavy-Residue Industrial Decanter Centrifuge is designed for separating heavy sludge, sticky residue, tar sludge, high-solids slurry, and difficult-to-discharge industrial materials.

Compared with a standard decanter centrifuge, this machine focuses on high-torque screw conveying, anti-blockage discharge design, controlled differential speed, stable cake removal, and reliable operation under sticky or high-solids feed conditions.

• Coal chemical sludge dewatering
• Coking oily residue separation
• Coke tar sludge treatment
• Coal gasification sludge dewatering
• High-solids heavy sludge discharge
• Oily industrial sludge separation
• High-COD sludge reduction
• Coal washing fine sludge treatment
• Gasification black water sludge separation
• Process residue sludge reduction
• Oily scum and heavy residue handling

Heavy-residue materials are more difficult to handle than ordinary wastewater sludge.

The main problem is not only separation. The harder part is often how to push the separated cake out continuously without blockage or overload.

Common difficulties include:

• Tar sludge may have high stickiness and poor fluidity
• High solids content increases screw conveying load
• Oil, tar, fine particles, and sludge flocs can form a dense sticky cake
• Heavy residue may not move smoothly inside the bowl
• Standard screw conveyors may face rising torque under heavy load
• Unstable cake discharge can cause material accumulation
• If discharge is not continuous, blockage risk increases
• Improper differential speed may cause either wet cake or torque overload
• Feed concentration fluctuation can suddenly increase machine load

For this type of material, the centrifuge should be selected as a heavy-duty cake discharge machine, not only as a basic solid-liquid separator.

1. Coal chemical sludge or coking oily residue enters the rotating bowl through the feed pipe.
2. Under centrifugal force, heavier solid particles, coal fines, ash, precipitated solids, and sludge flocs move outward and form a sediment layer on the inner wall of the bowl.
3. The clarified liquid phase stays closer to the center and is discharged continuously through the liquid outlet.
4. The screw conveyor rotates at a controlled differential speed and pushes the separated heavy sludge cake toward the discharge end.

Heavy Sludge Discharge Capability

High-torque configuration helps convey dense, sticky, and high-solids sludge more stably.

Suitable for Oily and Tar-Containing Residues

Two-phase or three-phase configuration can be selected according to whether oil recovery is required.

Reduced Sludge Disposal Volume

The centrifuge helps reduce liquid content and total residue volume, lowering downstream transport, drying, disposal, or incineration load.

Wear Protection for Coal Fines and Ash

Wear-resistant protection can be added to the screw conveyor, feed zone, and discharge ports to handle abrasive coal and mineral particles.

Anti-Corrosion and Sealing Options

Material and sealing options can be selected according to coal chemical wastewater composition, odor, vapor, and corrosion conditions.

Explosion-Proof Configuration Available

When oily residue, tar vapor, or hazardous site classification exists, explosion-proof motor, electrical control, grounding, and sealing options can be considered.

Better Adaptability to Feed Fluctuation

PLC / VFD control, torque monitoring, and differential speed adjustment help handle changing feed concentration and solids load.

• 70–95% solid capture rate, depending on particle size and flocculation effect
• 60–90% suspended solids reduction, depending on separation target
• 25–45% cake solids content, depending on sludge type and oil/tar content
• 30–65% sludge or oily residue volume reduction
• 50–85% recoverable oil recovery, when a suitable three-phase process is used
• More stable discharge of heavy and sticky sludge
• Lower downstream drying, disposal, or incineration load
• Reduced manual cleaning compared with unstable batch handling
• Better process continuity under fluctuating feed conditions

• Feed material name
• Coal chemical process type
• Capacity requirement, in m³/h or tons/day
• Feed solids content
• Oil content
• Tar content, if available
• Water content
• Particle size distribution
• Sludge density
• Viscosity
• Temperature
• pH value
• COD level and whether COD is dissolved or particle/oil-associated
• Abrasion condition
• Corrosion condition
• Whether the feed contains flammable components
• Site hazardous area classification, if available
• Current pretreatment method: heating, dilution, demulsification, flocculation, screening, or thickening
• Target cake moisture
• Target liquid clarity
• Target oil recovery rate, if applicable
• Whether two-phase or three-phase separation is expected
• Downstream process after centrifugation
• Required operating hours per day
• Site voltage and control preference
• Need for explosion-proof system or not
• Need for skid-mounted system or not