disc centrifuge

1 unit of GNSD-90 disc stack separator and 1 unit of GNLW-454ET decanter centrifuge are shipped to our domestic client. These equipments are for separation of oil ,water and solids.
The working process is as below:


The decanter centrifuge feed pump transfer the oil sludge to decanter centrifuge feed tube, in the meanwhile, the dewatering unit mixed the proper chemicals, the chemical dosing pump transfer the chemicals to static mixer and then to decanter centrifuge feed tube, the mixing oil sludge and chemicals are mixed well, so it will be easily to be separated out by decanter centrifuge, the solids size bigger than 2 microns will be separated out, the oil and water mixture fluids will flow to buffer tank, then feed to disc stack separator, to separate oil, water and little solids. The mixture fluids feed to disc centrifuge must be with solids content less than 3%, otherwise it will block the disc stack separator easily.
The technical specification is as below:
GNLW-454ET decanter centrifuge with bowl diameter 18 inch(450mm) , bowl length 74.5 inch (1890mm), max speed is 3500rpm, max G force is 3084G, bowl L/R ratio is 4.2, the main motor and back drive motor will be suggested by our engineer according to client’s material. The handling capacity will be also depend on the chemical to be used and treated material.


GNSD-90 disc stack separator for oil, water, solids separation:
Bowl diameter is 580mm, slide piston is 500mm, the max speed is 6150rpm, max G force is 12273G, motor power is 18.5KW, the starting time is 10 to 15 minutes, the major components of the disc stack separator is the bowl, the process effect is obtained by the rotating drum with high speed.
Except for decanter centrifuge and disc stack separator, to treat oil sludge, the user also need other accessories, pls contact with GN solids control for more information.

Recently GN solids control shipped one set of oil and water separation package for China Oilfield Service company. The technical configuration is as below:


1) 2 phase decanter centrifuge to separate fine solids from fluids
2) Screw pump to feed the crude oil / oil sludge to decanter centrifuge
3) 3 phase centrifuge ( disc centrifuge) to separator oil from water, by adding proper chemicals, the recovered oil can be with BS & W below 3%, which can be accepted by most users.
4) Diaphragm pump to feed the clean fluids discharged from decanter centrifuge to disc centrifuge
5) Buffer storage tank for oil and water with oil pump and water pump, 2 liquid level meters are installed on each tank, when the oil or water level reached the setting level, the oil pump and water pump will pump the oil and water to the big storage tank
6) Package skid, all the above mentioned items sit on one skid for convenient transportation and operation

This is one modular of the oil sludge separation system, the complete oil sludge treatment system including waste pick up pump ( normally we used vacuum pump), Pre-mixing tank modular, screen modular to separate coarse solids, chemical dosing system, and the last modular is 3 phase separation package.
The pre-mixing tank is the most important part, when the solids content is higher than 30%, the waste oil sludge should be diluted by proper fluids and low the solids content below 30%, if necessary, the demulsifier should be added by this process for easier separation for the next phase separation. The mud agitator is agitating the oil sludge with chemical mixing evenly and the submersible slurry pump will transfer the fluids to screen modular to separate the coarse solids.
For more information, pls contact with GN solids control.

Last week, GN finished production of 2 m3/h oil sludge separation system for USA client, this week, we finished production for 15 m3/h oil sludge treatment system for Europe client, this is the repeat order for this client, they bought one unit of 1 m3/h compact design oil sludge separation system for the same project. They are satisfied with the separation result, so repeat order for a bigger treating capacity system.
The configuration of the containerized 15m3/h oil sludge separation system:
1) Premixing tank: The sludge vacuum pump transfer the oil sludge from the waste pit to the pre- mixing tank, which is equipped with heating line inside the tank around, and the mud agitator installed on the tank to agitate the oil sludge to prevent the solids from accumulation in the tank bottom. The system will be used in cold weather area, we put them in the container to keep the equipments warm.


2) Shale shaker tank, to separate coarse solids from the oil sludge, this is to protect the decanter centrifuge, coarse solids will wear the centrifuge screw very quickly, GN decanter centrifuge screw is made of stainless steel 304 by heating, the flights are protected by tungsten carbide tiles, it is fixed by special glue and bolts.


3) Decanter centrifuge modular: With one unit of 22 inch bowl decanter centrifuge installed inside the 40ft container, the screw pump is installed on the centrifuge skid, the screw conveyor is installed under the centrifuge solids discharge port to transfer the solids outside the centrifuge container.

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.