Alfa Laval CDNX centrifugal decanter systems are made for mud handling. They efficiently remove solid particles from water and oil-based slurries resulting in better penetration rates, shorter drill times, less wear on key components as well as longer sludge service life. It also reduces chemical usage as well as drill waste, which contributes to lower disposal and waste water treatment costs.
Ease of operation and high uptime
- Specifically designed for dewatering at industrial sites including drilling, boring and construction
- Small footprint – easy installation and mobilization
- Continuous and automatic operation with option of remote surveillance
- High separation efficiency – clean slurry improves drill penetration rate
- Highly sustainable cleaning capacity – less waste due to dry cake and reused slurry
Normally installed in a bypass system, our CDNX centrifugal decanters operate continuously without interrupting drilling operations. The range can handle mud flow rates from 5 m3/hour up to 100 m3/hour. The variable bowl speed ensures the right G force required for the most efficient separation while the conveying speed can be adjusted for optimal balance between liquid clarity and solids dryness. The adjustable pond depth also contributes to the best balance between clarity and dryness.
How it works
The Alfa Laval CDNX decanter centrifuge is based around a slender cylindrical bowl with a relatively large length:diameter ratio and a conical end. The bowl rotates at speeds of up to 5,200 rpm (depending on model) producing a centrifugal force of between 300 and 3574 G.
The key components include a main drive motor, heavy-duty gearbox, back drive motor and control panel. The direct drive gearbox enables you to automatically control the conveying speed.
The liquid drilling slurry is fed into the long cylindrical bowl, where the centrifugal force presses it outwards to form a layer (known as the pond) around the wall. The thickness of the pond is determined by a series of discharge weirs at the end of the cylindrical section. The clarified liquid flows out over the weirs with the aid of centrifugal force. Since the solids in the slurry are heavier, they remain plastered against the bowl wall and are continuously removed by the screw conveyor. They are then transported up to the conical section (known as the beach) where they exit via the discharge ports at the narrow end. Cleaned drilling slurry exits at the opposite end.
Innovative technology for dewatering duties
Alfa Laval decanter centrifuges are key to achieving high efficiency in exploration drilling, tunnelling, and construction, especially in terms of treatment of slurries and water cleanliness. The technology efficiently removes most of the fine particles that traditional slurry treatment equipment cannot without recourse to polymers. Due to specific design for construction sites and tunneling environments, the Alfa Laval decanter centrifuges cope with abrasive and coarse particles and can handle large volumes of feed solids and various flow rates.
The decanter centrifuges are available with a range of modules ideally suited for every kind of solids separation job. They range from fully automated operation to simple “hands-on” capabilities. Whichever you choose, you can look forward to effective solutions to your separation needs.
Accelerating sustainable solutions
Imagine a more sustainable world. A world in which less is needed to produce even more. A world in which we efficiently meet our growing energy needs and at the same time reduce CO2 emissions. Imagine a world where we can harness the power of natural resources while preserving them. At Alfa Laval, we don't just imagine this world. We build it together with our customers and our partners.