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Principle Introduction

A disc stack centrifuge is a vertical sedimentation centrifuge that uses the powerful centrifugal force generated by the high-speed rotation of the bowl to separate components with different densities in a mixture according to differences in their settling velocities.

A set of conical discs is stacked inside the bowl, with narrow gaps between the discs. The suspension or emulsion enters through the central feed pipe and flows upward through the gaps between the discs. Under the centrifugal force, denser solid particles settle onto the inner surfaces of the discs, slide outward, and accumulate at the maximum diameter of the bowl. The lighter liquid flows inward along the outer surfaces of the discs and is eventually discharged through the liquid outlet.

The key function of the disc stack is to shorten the settling distance of particles and significantly increase the settling area, thereby greatly improving separation efficiency and processing capacity.

Disc Stack Centrifuge Structure

The disc stack centrifuge consists of four major sections:

(1) Stationary Section

Base, housing, feed pipe, liquid discharge pipe, bearing housing, and vibration isolator.

Function: Supports the entire machine, collects and discharges the separated materials, and isolates vibration.

(2) Rotating Section

Bowl body, upper cover, locking ring, disc stack, distributor, central feed pipe, main shaft, and centripetal pump.

Function: Generates a high-speed centrifugal force field. The disc stack increases the settling area to achieve separation of light and heavy phases.

(3) Solids Discharge Section

Sliding piston, operating water chamber, solids discharge port, and operating water valve/solenoid valve.

Function: In models with automatic solids discharge, the sliding piston is controlled by operating water to discharge the solid phase at preset intervals and quantities.

(4) Drive and Control Section

Motor, variable frequency drive, transmission system, upper and lower bearings, seals, sensors, PLC control cabinet, lubrication system, and cleaning system.

Function: Provides power, speed control and braking, safety interlocking, and automated operation.

Working Process

The material enters the disc stack through the central feed pipe and distributor. In the centrifugal force field, the light phase moves toward the center, while the heavier phase and solid phase move outward and are discharged separately. During solids discharge, the sliding piston opens the solids discharge port and automatically returns to its original position after discharge.

Product Specifications

Parameter	LNC05 (Under Development)	LNC10	LNC15	LNC20	LNC25
Flow Rate with Water (L/h)	1000	3000	5000	10000	12000
Recommended Processing Capacity (L/h)	50–200	200–500	800–1500	1000–2000	1500–3000
Settling Area (m²)	8400	13200	28000	48000	80000
Maximum Speed (rpm)	13500	10350	8500	7500	7200
Separation Factor (G)	20000	14000	12500	11500	11000
Bowl Diameter (mm)	260	300	380	440	510
Bowl Volume (L)	1.5	3	6	8.5	17
Solids Chamber Volume (L)	0.6	1	2.5	4	7
Solids Discharge Method	Sliding Valve
Wetted Parts Material	316L
Surface Roughness (μm)	Ra 0.4
Seal Material	EPDM & PA6
CIP	√	√	√	√	√
SIP	×	√	√	√	√
Motor Power (kW)	4	5.5	7.5	11	22
Overall Dimensions (L × W × H, mm)	770 × 470 × 800	930 × 780 × 1100	1200 × 950 × 1100	1300 × 1000 × 1450	1700 × 1300 × 1400
Machine Weight (kg)	245	400	615	740	1150

Application Fields

The disc stack centrifuge is suitable for fine solid-liquid separation, efficient clarification, and multiphase separation. It is used across food and beverage processing, plant and traditional Chinese medicine extraction, biopharmaceutical processing, and industrial separation.

Food & Beverage: Used for continuous clarification during production to reduce the filtration load in downstream processes. Suitable for beer, wine, fruit juice, dairy products, plant-based beverages, edible oils, and other materials.

Plant & Traditional Chinese Medicine Extraction: Moves efficient solid-liquid separation upstream to the extraction stage. Suitable for plant extracts, traditional Chinese medicine extracts, essential oils, natural products, and other materials.

Biopharmaceuticals: Designed for high-load solid-liquid separation requirements in biopharmaceutical processes. Applications include vaccines, monoclonal antibodies, recombinant proteins, enzymes, biological products, fermentation broth, cell harvesting, and microbial cell harvesting.

Industrial Applications: Used for liquid clarification, oil-water separation, and multiphase separation in industrial processes.