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GNLW363G and GNLW363VFD centrifuges can be used for barite recovery when their rotary speed is adjusted to middle speed. We can provide middle speed pulley for GNLW363G centrifuge when it is used for barite recovery. GNLW363VFD centrifuge is variable frequency drive centrifuge.

When operation, increase the pond depth until the recovered solids become “runny”. Buoyant force reduces the torque to convey solids out of the centrifuge. A shallow pond creates a long beach section. Once the solids exit the pool, the extra energy required to convey these solids results in higher torque.


image

There are 2 ways to adjust the speed of decanter centrifuge:

1 Use 3 extra pulleys, when you want to use different speed, you can change the pulley accordingly.  for example, use middle speed to recycle the barite, use high speed to separate fine particles. By this way, you save the cost of VFD control panel, but it takes a long time to replace the pulleys. image

2 Use VFD control panel, it is the common way we used now. The variable speed drive control panel can be made with PLC control, with IEC ex or ATEX or UL certificate for explosion proof. When you start the centrifuge, you can adjust a lower frequency to protect the motors, after it works smoothly, you can adjust the frequency to your required speed. Even though it costs more compared with the 1st way, but it is much more convenient for operation.

The photo above is GN designed new VFD control panel for VFD decanter centrifuge, it is with small footprint and safe, easy operation.

In oil & gas drilling, positive displacement pump is used to feed for decanter centrifuge, Nemo pump is one of the best feeding pump for GN decanter centrifuge.

We can provide centrifuge with various Nemo pump according to client’s requirement, for example, stainless steel 304 or SS316L material, manual speed control, variable frequency drive or fix speed pump, flow rate various from 20m3/h to 90m3/h for various model decanter centrifuge. All the pump motor is explosion proof and with a speed reducer for steadily running.

As an expensive and significant material for drilling fluids, it is necessary to recover it from the used drilling fluids. Usually we use barite recovery centrifuge to recycle barite, together with a high speed centrifuge as a barite recovery unit.

Contaminants in barite, such as cement, siderite, pyrrhotite, gypsum and anhydrite, can cause problems in certain mud systems and should be evaluated in any quality assurance program for drilling-mud additives.

For GNLW363VFD decanter centrifuge, when control the speed 1500~1800rpm, it can be used for recycling barite.