decanter centrifuge

One set of complete oil sludge treatment system ready for delivery this week, this is a 2m3/h customized design oil sludge treatment system as per client’s requirement. The main purpose of the client is to recover the oil from the oil sludge. It can be widely used for refinery oil tank bottom cleaning, oil sludge separation, oil based cuttings treatment, contaminated soils treatment, hazardous waste treatment, etc. applications.


The technical configuration is as below:
1) Premixing Tank Module
The vacuum pump transfer the oil sludge from the waste pit to premixing tank, which is equipped with heating lines, mud agitator, the oil sludge will be washed, heating and agitating, mixing with chemicals for flowability.


2) Classify System: The oil sludge from premixing tank will be transferred to a V bottom tank with screw conveyor on the bottom for solids sedimentation and liquid classification. The top layer will flow to disc centrifuge for oil and water separation. The bottom layer will be washed with chemical jetting, which will be shipped to solids control module.


3) Solids Control module
The solids control module consist of course solids shale shaker and fine solids decanter centrifuge, the 2 panel shale shaker is the mini shale shaker among GN all the shale shaker models, it will reduce the solids content and separate the big solids bigger than 1mm, so that the decanter centrifuge will not be damaged.

The decanter centrifuge is the mini decanter centrifuge with 9 inch bowl, the highest speed is 4500rpm, the separation cut point is 2~5 microns. With good efficiency of the centrifuge, the clean fluids will flow to disc centrifuge for water oil separation, otherwise the high solids content will influence the separation result of the disc centrifuge.

This week GN shipped several units of waste water treatment decanter centrifuge to Russia, The model is GNLW363C-VFD, This is one of the most popular model decanter centrifuge among GN equipments, it can be applied for many industries including waste water treatment, drilling fluids recycling/ cleaning, dewatering unit, drilling waste management system, dredging slurry separation system, industrial waste water treatment and all the other liquid solids separation application.


There are many size decanter centrifuge for option, 9 inch, 14 inch, 18 inch, 22 inch, 30 inch with different treating capacity, the treating capacity for different material varies a lot for the same bowl size. For the same bowl size, we have different ratio when used for different industry, for example, 9 inch bowl centrifuge have models of GNLW223 and GNLW224, GNLW224 with longer bowl length, the ratio is 4, with better performance in separation, discharge fluids is more clear, the discharged solids is drier, it is an ideal decanter for the dewatering fluids, when the client need to get pure water to send to waste water treatment plant or drain off to the river/ pond.


The 14 inch bowl also have GNLW363 and GNLW364, The 18 inch bowl also have GNLW452, GNLW453-VFD, GNLW454-VFD for option, the 22 inch bowl also have GNLW553-VFD, GNLW554-VFD.

This week we shipped one unit of oil based drilling waste management system for CNPC, they ever bought similar system before for their domestic and international projects.


To get ideal result of the discharge cuttings and recover oil as much as possible, the performance of vertical cuttings dryer is the major concern. GN has a lot of successful experience for drilling waste management projects, our vertical cuttings dryer has been improved to E version from the year of 2013 when we firstly produce the vertical cutting dryer as per our client’s suggestion and site feedback. From the first A version to the existing E version vertical cuttings dryer, it has been more and more user friendly and maintenance cost has been reduced a lot.


We have 900rpm, 1200rpm rotary speed for option to meet different requirement, the G force is up to 420G / 750G, and the screen basket opening can be 0.25mm, 0.35mm, 0.5mm for option for different drilling waste conditions. The screen basket and screen basket frame is separated, the operator only need to replace the single screen basket when it is wear. The independent oil lubrication system is for better lubrication of the bearing to prevent it from over heating. The automatic interlock system between oil pump motor, main motor and flush pump motor is equipped in case that the main motor starts before oil pump motor.
The decanter centrifuge is used after the vertical cuttings dryer to treat the fluids discharged from the vertical cuttings dryer, after treated by the centrifuge, the fine solids over 2 microns can be separated mostly, the fluids can be used to prepare for new drilling fluids or reuse directly. The high speed decanter centrifuge is used for low gravity solids, the max speed is up to 3900rpm.
If you need oil based cuttings treatment system, pls contact with GN freely.

This week GN solids control shipped 2 units of Large Bowl 30 inch GNLW764A Decanter Centrifuge for Mining Industry to Australia, this is the largest centrifuge model we have made right now, we have 9 inch, 14 inch, 18 inch, 22 inch and 30 inch bowl decanter centrifuge with different treating capacity, different speed, different G force for various applications.


The diameter of the centrifuge bowl is 760mm, the bowl length is 3328mm, the treating capacity is 528gpm, max bowl speed is 2650rpm, typical bowl speed is 2200rpm, max G force up to 3000G, typical G force is 2060G. The main power is 160KW, back drive motor is 90KW, the gearbox Torch is 25000.N.M.


Same with the smaller decanter centrifuge, the screw propeller protection is tungsten carbide tiles, the bowl fluids distribution port and solids discharge port is protected tungsten alloy for longer working life, the bowl material is made of duplex stainless steel 2304 for anti corrosion.


The bearing for this big bowl centrifuge is very big, need separate lubrication system for better lubrication to extend the working life of the bearings. The plate type heating exchanging system can effectively cool down the lubrication oil so that to get a better cooling performance and the temperature sensor installed on the bearing seat will send signal to the PLC to trip off the centrifuge in case of over high temperature.

GN solids control shipped several units of drilling waste cuttings screw conveyor to Africa Client, this is repeat orders for the same clients for many years. The screw conveyor is widely used for transferring and collecting the drilling waste cuttings from solids control system.


The installation of screw conveyor:
The screw conveyor might be installed on different place for different functions, for example, it can be installed along with the solids control system mud tank besides the shale shaker, mud cleaner, decanter centrifuge to collect the discharged drilling cuttings; it can be installed slantly under the horizontal installed screw conveyor to transfer the drilling cuttings to vertical cuttings dryer; it could be installed under the vertical cuttings dryer solids discharge port to transfer the discharged solids cake outside automatically, it can be installed under the decanter centrifuge solids discharge port to transfer out the solids automatically. It can be used in cuttings solidification unit to transfer the 3 materials and mix them together.


The screw conveyor can transfer the material with less fluids content in the cuttings, otherwise it will flow back and spill out. When the fluids content is very high, we need to use vacuum pump, slurry pump or hose pump to transfer to the drilling waste management system.