VFD centrifuge

The drilling mud decanter centrifuge driven
by VFD will give many benefits to the clients. The adjustable bowl speed and differential
speed allows the operators to set the right G force and solids pushing speed
according to the drilling mud conditions.

To design the VFD Control Panel, the
contractor needs the power supply specifications. Normally it is 460V/60HZ for
USA standard or 380V/50HZ for Europe and China standard. Than the pulley size
of the motor and bowl side will decide the bowl driving speed at different
frequency. After confirming the bowl speed formula, the contractor needs the
formula for calculation of the differential speed. For GN Decanter centrifuge,
the Sun-Wheel gear box ration is 57:1. So the differential speed will be the
bowl speed minus the gearbox input speed and divided by 57.

For the VFD Control panel, there is
different explosion proof standard. In China, it is CN Explosion proof which is
close to IEC Ex standard. In Europe, it is ATEX Explosion proof. And in North
America, the explosion proof standard is UL for USA, and CSA for Canada.

GN Pressurized VFD Decanter Centrifuge control
panel is specially design for Zone 1 or Zone 2 standard with ABB VFD and
stainless steel cabinet. The PLC smart control allows the user to operate the
drilling mud decanter centrifuge by HMI screen.

GN VFD decanter centrifuge has been
exported to over 30 countries and regions, GN Solids Control VFD decanter
centrifuge is available in different sizes including: GNLW223C-VFD (9inch)
bowl, GNLW363C-VFD(14inch bowl), GNLW453C-VFD (18inch bowl), and the big bowl
big volume centrifuge with 22inch bowl and model is GNLW553C-VFD.

To support the worldwide operators, GN
Solid Control keep expanding our branches, now , GN service and support are
available from Beijing, China, Houston, USA, and Russia. Some other areas are
covered by GN local partners who are the professional solids control service
companies.

GN Solids Control is China leading manufacturer on mud solids control and drilling waste management field. As the 1rst API certified solids control company in China, and the first China solids control manufacturer who has warehouse and branch company in Houston, USA, GN can offer you professional solutions on mud treatment for oil and gas drilling.
IN year 2015, GN Solids Control promoted its advance drilling waste management equipment: drilling cuttings solidification unit.
GNGH-15 drill cuttings solidifications unit can dry 15 m3 (max.) cuttings per hour. The oil field drill cuttings solidifications unit is mainly combined of mud mixing tank, cement storage tank, absorber storage tank, the conveyer systems, and electrical control system for the whole system. All items mounted on the tank skid for easy movement. GN offers turnkey solution for customers.
Applications of the drilling cuttings solidifications unit:

1) It can be used to dry the drilling cuttings from solids control system, like from shaker, desander, desilter, mud cleaner, and decanter centrifuge
2) More widely, it is used to dry the drilling cuttings from drilling waste management system. The cuttings from solids control system, after further treated by high G drying shaker, vertical cuttings dryer and decanter centrifuge, it is more suitable for drill cuttings solidification unit to treat.
Other Solids Control equipment offered by GN:
1) Shale shaker: linear motion, it is the first step solids control equipment in drilling rig. Nearly all rigs equipped with shale shaker.
2) Desander, it is the second step solids control equipment
3) Desilter, it is the third step solids control equipment.
4) Mud cleaner: it is the combination of shale shaker, desander and desilter
5) Middle speed and high speed Decanter centrifuge
6) Other solids control equipment: centrifugal pump, centrifuge feed pump, mud agitator, mud gun, poor boy degasser, vacuum degasser,
Other Drilling waste management equipment
1) High speed drilling waste decanter centrifuge and big bowl centrifuge
2) High G force 4-panel drying shaker
3) Vertical cuttings dryer
4) Screw conveyer
5) Drill cuttings solidification unit
6) Thermal Desorption unit

Per different control system, there are fixed speed decanter centrifuge and variable speed control (VFD) decanter centrifuge.

Features of fixed speed control centrifuge

As the bowl speed and conveyer speed is fixed, cannot be changed, fixed speed control centrifuge is easy for operation and maintenance. And price lower compared with the same model VFD centrifuge.

Feature of variable speed control (VFD) decanter centrifuge

For the same model centrifuge decanter, VFD model cost more than fixed speed. Per International Explosion-proof standard, there should be positive pressured control panel for variable speed control for better cooling. It requests more professional on operators for the VFD decanter centrifuge.

For GN design VFD centrifuge, the bowl speed, conveyer speed and feeding pump flow are all flexible. Customer can change one or all of the 3 parameters to get the best separation performance in different jobsite. An and customer can change centrifuge parameter for getting the max. capacity centrifuge can reach.

Take GNLW363BG-VFD centrifuge for example, below steps show you how to find out the max. capacity of the centrifuge

1) For a bigger capacity, we should reduce the BOWL speed and increase CONVEYOR speed.

BOWL SPEED: 2000RPM

CONVEYOR SPEED: 40RPM

Pump running model set as AUTO

Then pump will running to the max. capacity it can reach.

2) Or you can try more settings to compare the capacity, with pump AUTO running:

a. Bowl 1600rpm, Conveyer 34rpm

b. Bowl 1800rpm, Conveyer 38rpm

3) The back drive motor is opposite rotating under low speed and high conveyer. If centrifuge shut down during running , reduce Conveyer speed.

4) For this centrifuge, the max. capacity will be not over 30cbm. As the pump max. capacity is 30cbm.