Advantages of Using Decanter Centrifuges in Industrial Processes

By Christophe Rude Jul 14, 2023

Separating solid material from liquids is an essential step in many industrial processes. Decanter centrifuges employ high-speed rotation and powerful centrifugal forces to separate solids from one or two liquid phases. The liquid phase forms a concentric inner layer and overflows an adjustable dam plate into the discharge zone. The volumetric flow rate influences the transport behavior of the sediment. Menesklou et al. have shown that the effect of this variable has little influence on the results at investigated industrial scale.

Cost-Effectiveness

Decanter centrifuges separate large volumes of solids from liquids continuously. They can be found in sewage treatment plants, oilfield sites for solids control separation applications, and environmental services like dredging. The clarified liquid flows to the cylindrical end of the bowl and runs out through openings that contain precisely adjustable weir plates. These plates regulate the pond depth in the bowl and eliminate the need for a separate chamber pump. In this way, the separating process is cost-effective.

Additionally, decanter centrifuges are used to wash and dry various industrial products. This makes them ideal for a variety of applications. Each Hiller decanter centrifuge is computer designed and modeled before it goes into production at our factory, where precision CNC machining and experienced artisans produce equipment to exacting standards. The resulting machines are reliable and user-friendly. They also offer a wide range of capacities.

Efficiency

Decanter centrifuges use the sedimentation principle to speed up the dewatering or thickening of slurries and suspensions in industrial applications. They also help to clarify liquids resulting from the settling out of solids.

They are also easier to control than other separation technologies, which can be sensitive to varying process fluid mix variations. It can handle process variations and produce consistent separation results without compromising the final product quality. The decanter centrifuge has a more straightforward construction, making it easier to access and replace parts. It is typically a rotating drum with an internal rotating auger. The drill is usually made from 316L duplex stainless steel, and the scroll flights are spray-coated with tungsten carbide hard-surfacing for erosion protection. The sludge discharge nozzles are also coated with stellite erosion-resistant inserts. Decanter centrifuges are available in various sizes and capacities to suit different application needs. They can also be modified to meet special requirements, such as explosion-proof upgrades for hazardous areas.

Reliability

Decanter centrifuges have a wide range of applications, from the separation of crude oil tank bottoms to olive oil dewatering. They are particularly suited to process fluids with varying composition, concentration, and particle size. A typical decanter centrifuge consists of a cylindrical bowl with a conical end and a conveying screw inside it, which rotates at a slightly different speed from the bowl. The helical screw channel causes solid particles to settle along its inner wall and be conveyed to the conical end of the decanter centrifuge, where they are separated from the liquid by induced shear forces.

Environmental Impact

Decanter centrifuges use high G-forces to separate solids from liquids. This separation process is more efficient than traditional clarifiers or settling tanks that use gravity to separate the liquid and solid materials.

The denser solid particles are pushed outwards against the rotating bowl walls when the waste stream enters a decanter centrifuge. In contrast, the less dense liquid phase is deposited in a conical layer at the machine’s center (called a beach). The solids-rich fluid (also known as the “heavy phase effluent” or the “cake”) is separated from the clean liquid stream (known as the “center” or the “light phase effluent”) through the use of different dam plates and special conveyor and discharge geometry. Many power plants use steam turbines to generate electricity. These turbines need lubrication to work, and contamination of the lubricant with metal fines and moisture can cause unscheduled maintenance and failure of the motors.

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