GN Separation has recently completed the production of a batch of hydraulic-driven decanter centrifuges, specifically the GNLW364-FHD model, for an overseas starch processing plant. These centrifuges, powered by Viscotherm's renowned hydraulic technology, deliver efficient and sustainable solid-liquid separation, particularly in high-viscosity applications.

How a Hydraulic Decanter Centrifuge Works

A hydraulic decanter centrifuge is a fundamental component in industries that rely on continuous solid-liquid separation. It harnesses centrifugal force to separate suspended solids from liquids based on their density differences. Here's a breakdown of its operation:

1. Feed Introduction: The process commences with the introduction of slurry, such as starch slurry, into the rotating bowl through a stationary feed tube.
2. Centrifugal Sedimentation: As the bowl rotates at high speeds (typically between 2,000 and 4,000 RPM), centrifugal forces up to 3,000×G propel denser solids towards the bowl's wall, while the lighter liquid forms an inner layer.
3. Conveyor Mechanism: A screw propeller, rotating at a slightly different speed than the bowl, transports the settled solids towards the conical end for discharge.
4. Phase Separation: Clarified liquid exits through adjustable weirs at the cylindrical end, enabling precise control over separation efficiency.

In hydraulic drive systems, the rotational motion of the bowl and screw is primarily or partially driven by hydraulic motors. Unlike traditional mechanical gearboxes, hydraulic systems offer variable speed control and dynamic torque adjustment, optimizing performance even under fluctuating feed conditions.

Advantages of Hydraulic Drive Systems

The GN centrifuge employs Viscotherm's hydraulic drive system, a hybrid design that integrates hydraulic and mechanical elements. This configuration offers several benefits, especially for high-viscosity and high-concentration materials:

1. Stable Torque Output: The hydraulic drive ensures smooth and efficient operation, minimizing vibration and noise while enhancing separation efficiency and stability.
2. Accurate Differential Control: The hydraulic differential allows for precise control, even at extremely low differential speeds, making it ideal for applications requiring high separation accuracy.
3. Adaptability to Harsh Conditions: With robust heat dissipation and sealing, the hydraulic system operates reliably in high-temperature and high-humidity environments.
4. Stable Sealing Performance: The system's sealing design effectively isolates contaminants, preserving oil purity and minimizing downtime due to malfunctions.
5. Compact and Lightweight Design: The hydraulic differential is smaller and lighter than mechanical alternatives, reducing stress on main bearings and contributing to the overall longevity of the equipment.

Applications of Hydraulic Decanter Centrifuges

Hydraulic decanter centrifuges are highly versatile and find applications across various industries, including:

1. Starch Production: Efficiently separating solids from liquids in starch processing.
2. Wastewater Treatment: Removing solids from wastewater to comply with environmental standards.
3. Chemical & Pharmaceutical: Ensuring product purity in chemical and pharmaceutical manufacturing processes.
4. Mining & Minerals: Separating valuable minerals from ore slurries.

GN Separation's hydraulic decanter centrifuge, with its precise control and robust performance, is an excellent choice for a wide range of high-viscosity applications. For more information about GN's decanter centrifuges or to discuss your specific requirements, please don't hesitate to contact us.