HFLWS three-phase centrifuge

Equipment Overview

The LWS series centrifuge is a three-phase centrifuge developed by integrating advanced international technologies, building on the successful application of the LWS430 three-phase centrifuge. It features a simple structure and user-friendly operation, allowing for seamless switching between two-phase and three-phase modes and offering excellent adaptability.

Separation principle

The operating principle of the LWS-type three-phase horizontal screw‑discharge sedimentation centrifuge is similar to that of the LW-type two-phase horizontal screw‑discharge sedimentation centrifuge. After the two liquid phases and one solid phase enter the centrifuge, the density difference between solid–liquid–liquid is exploited, with the centrifugal force amplifying this disparity by several thousand times. The solid phase settles out, while the two liquid phases separate into distinct layers, thereby achieving three‑phase separation of solid–liquid–liquid. Under the action of a specialized mechanism, each phase is discharged from the machine. The entire feeding and separation process is continuous, enclosed, and fully automated.

• Separation modes: liquid–solid–liquid, liquid–liquid–solid, and solid–liquid–liquid.
• Application areas: Primarily used for three-phase separation of coal tar, wheat gluten, food waste, fish oil, palm oil, and oily sludge.

Working principle

• Core separation process: The suspension enters the drum via the feed pipe and the screw discharge port. Driven by the centrifugal force generated during high-speed rotation, the density difference among the three phases causes the heavier solid particles to deposit on the inner wall of the drum. The clarified liquid, after separation, exits the drum through outlet ports located at different depths along the drum. Two immiscible liquids of differing densities form concentric cylindrical layers, with the lighter phase occupying the inner layer and the heavier phase the outer layer; the thickness of each liquid ring can be adjusted by regulating the overflow weir via the overflow plate. The heaviest phase deposited on the drum wall is conveyed by a counter‑rotating screw conveyor toward the conical section of the drum and discharged through the discharge port. The separated intermediate phase is discharged from the central outlet and routed into the distribution network, while the lightest phase, after separation, is discharged from the side outlet and directed into a storage tank (depending on which phase is being recovered).
• Differential speed control: The relative motion between the screw and the drum (the differential rotational speed) is achieved via a differential gear, with its magnitude regulated by the auxiliary motor. The differential housing is connected to the drum, its output shaft is linked to the screw assembly, and its input shaft is connected to the auxiliary motor. While the main motor drives the drum to rotate, it also rotates the differential housing; the auxiliary motor, through a coupling, controls the rotation of the differential’s input shaft, enabling the differential to transmit torque to the screw at a specified speed ratio, thereby achieving continuous separation.
• Regulatory function:
  The heavy-phase liquid exits the drum through the holes in the “2 – Heavy-Phase Liquid Level Adjustment Plate,” while the light-phase liquid flows out of the drum via the circumferential holes in the cover plate, as regulated by the “3 – Heavy- and Light-Phase Liquid Level Adjustment Plate.”
  By adjusting the “1 – Total Liquid Layer Adjustment Plate,” it is possible to regulate the dryness of the solid phase and the solids content of the liquid phase.
  By adjusting the “3‑phase heavy‑light liquid‑layer regulating plate,” the degree of separation between the heavy and light liquid phases can be controlled.

Technical Specifications

Schematic Diagram of the LWS Series Centrifuge Structure

1. Auxiliary motor; 2. Differential; 3. Heavy- and light‑liquid outlets; 4. Drum; 5. Screw feeder; 6. Base; 7. Housing; 8. Liquid outlet; 9. Drive unit; 10. Main motor; 11. Suspension liquid

Schematic diagram of heavy and light liquid level control

1. Heavy liquid phase; 2. Light liquid phase; 3. Heavy liquid phase outlet; 4. Light liquid phase outlet

Triphasic separation of fish oil

Structural Diagram of a Three-Phase Decanter Centrifuge

Coal tar three-phase separation

Three-phase separation of food waste