In conventional separation processes, solids are removed from liquids, or two liquids of different densities are separated. In real-world operations, however, solids and multiple liquid phases are often present at the same time. Three-phase separators address this challenge by continuously separating solids, a light liquid phase, and a heavy liquid phase in a single, streamlined process.
For effective three-phase separation, the two liquid phases must be immiscible and have different densities, and the solid phase must have the highest specific gravity. This technology is especially valuable in applications such as oil sludge treatment, wheat starch processing, and fat recovery.
Three-phase separating decanter offer several design options for discharging the liquid phases. In configurations where a centripetal pump discharges the light phase while the heavy phase is discharged by gravity, the light liquid exits the centrifugal bowl through a replaceable regulating ring and is pumped out under pressure by the centripetal pump. At the same time, the heavy liquid is discharged by gravity through a replaceable regulating tube. The optimal configuration depends on the material being processed and the customerโs site layout.
Huading’s series of three-phase decanter centrifuges are designed for reliability and efficiency, offering proven performance and industry-leading safety features at a low cost. This series achieves new levels of control, speed, and reliability, making it ideal for recovering and reusing valuable resources in edible and non-edible oils and their by-products, oil and gas, and industrial applications.
Product features
Three-phase separation decanters offer numerous advantages to users: the integration of processing steps eliminates the need for additional separation stages, significantly reducing costs. Besides its high selectivity, its versatility is also highly attractive. It can adapt to constantly changing feed conditions at any time.
Efficiency
The three-phase separation decanters delivers exceptional economic efficiency by performing continuous three-phase separation in a single process, eliminating the need for additional processing steps or downstream separation stages. A key advantage of Huadingโs design is the use of impellers, which enable the highest possible purity of the separated liquid phases. In addition, the separation parameters can be adjusted at any time, allowing the process to respond quickly and precisely to changing operating conditions.
Efficiency
The three-phase separation decanters delivers exceptional economic efficiency by performing continuous three-phase separation in a single process, eliminating the need for additional processing steps or downstream separation stages. A key advantage of Huadingโs design is the use of impellers, which enable the highest possible purity of the separated liquid phases. In addition, the separation parameters can be adjusted at any time, allowing the process to respond quickly and precisely to changing operating conditions.
Safety
Because centrifuges operate at high rotational speeds, run continuously, and are used across a wide range of applications, safety is a critical priority. Huading ensures reliable and safe operation through application-specific wear protection, media-optimized material selection, and carefully engineered machine configurations. All equipment is designed in accordance with current international standards and is continuously monitored by advanced sensors and evaluation systems, ensuring a high level of operational safety. For processing flammable or hazardous mixtures, ATEX-compliant explosion protection is available in accordance with applicable directives and standards.
Hygiene
Hygiene requirements are especially stringent in the food and beverage industry, one of the core application areas for Huading centrifuges. All machines are designed and manufactured in strict accordance with hygienic design principles. Components that come into contact with the product fully support CIP (Cleaning-in-Place) systems and are specifically engineered to enable efficient, automated cleaning.
Operation
Huading centrifuges feature a compact, application-optimized design that simplifies both operation and maintenance. High levels of automation are achieved through actuator-controlled impellers, ensuring precise process control, reduced manual intervention, and reliable long-term performance.
How do decanters work?
In the solid-liquid separation process, centrifugal force pushes the denser solids towards the rotating bowl wall, while the less dense liquid forms an inner layer inside the decanterย centrifuge.
To meet the diverse process requirements of water treatment, food processing, and energy applications, decanter centrifuges utilize interchangeable weir plates or energy recovery discharge elements to adjust the liquid level. Solids are continuously conveyed by a screw conveyor that rotates at a controlled differential speed relative to the bowl. This adjustable speed allows the solids to move upwards along the conical section, separating from the liquid pool and being efficiently discharged.
In the Huading decanterย centrifuge, the centrifugal field compacts the solids and expels residual liquid, producing a dewatered “filter cake” that is conveyed and discharged. The clarified liquid is discharged through an overflow weir or discharge pipe at the other end of the bowl. Internal baffles guide each phase to its respective flow path for clean and efficient collection, minimizing the risk of cross-contamination.
To cope with fluctuations in feed solid content, a variable frequency drive (VFD) and torque control system continuously monitor the conveyor load and automatically adjust the differential speed. Higher solid loads trigger speed changes to prevent torque overload, maintaining stable operation and consistent cake dryness. At lower loads, the system reduces speed to minimize wear and energy consumption.
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