centrifuge | GN Decanter Centrifuge

GN Oil Water Separator for Oily Sludge Separation Systems

As the development of energy industry and also the enhancing demand of environment protection, the oily sludge, or oily waste discharged from the energy industry are being restricted to be disposed directly. The regulations and standards are more and more rigid than before. Now all the players in this field are facing a problem: how to treat the oily sludge efficiently and safely?

GN Solids Control has provided a solution, which is proved to be suitable in both domestic China and abroad. The complete system is combined of several equipment, which serve different applications, including the functions for heating, pre-mixing, reduce the viscosity, separating out the solid particles, leveling the oil and water and finally separate out all of the 3 phases.

GN Oily Sludge Separation SYSTEM
GNOWS series Oil Water Separator is one of the important equipment in an oily sludge separation system. It is located after the GNIPC Inclined Plate Clarifier or a GNLW decanter centrifuge to hold and further treat the liquid phase from forehand equipment, to separate the oil from water.
The working principle is gravity stratification cause by the different density of water and oil. Inlet of this equipment is the waste liquid, while the outlets are 3: the clean oil outlet, the clean water outlet and the gas release ports. Inside the GNOWS oil water separator, there is a detachable coalesce, when the oily wasted water enters the oil water separator and meets the detachable coalesce, the oil and water could be separated. Then the oil enters the oil chamber while the water enters the water chamber. The tank is designed to hold the liquid for a while for a complete separation of the 2 kinds of liquid. Outside the tank, there is a visible level meter, for the operator to observe the inside condition in time.
For this equipment, GN has different models for different treating capacities, please see details in GN website.

Q/A for GNLW Series Decanter Centrifuges

GN Solids Control, as the first API certified solids control manufacturer in China and also the leading oil and gas centrifuge producer, has a full range of centrifuge models from the 9 inch diameter bowl baby centrifuge to the 30 inch diameter bowl giant centrifuge. Each year, GN produces more than 150 sets centrifuges of different sizes and GN equipment like shale shakers, shaker screens and decanter centrifuges are sold to more than 70 countries or regions in the world.

About GN Solids Control

This Q/A are giving more information for choosing and getting a more comprehensive information of GN Centrifuges.
1. Why there are VFD for decanter centrifuge and also fixed speed available?
VFD control panel helps the operators to adjust the speed, the differential speed and other main parameters of centrifuge to get a suitable separating result. In drilling cuttings or drilling fluid waste management conditions, when the material condition is not stable, it is necessary to use a VFD one. But in case of solids control system of a drilling rig, when the mud condition is stable, a fixed speed control panel here is more economic, cause it requests less maintenance and easier operating. Take GNLW363CG for example, even the fixed speed one, GN could provide pulley and belt for an extra common speed.
2. What’s the main difference between the high speed decanter centrifuge and a middle speed decanter centrifuge? The rotating speed of centrifuge determines the cutting point the centrifuge could treat out, for example the GNLW452C decanter centrifuge, with a typical speed at 1800RPM is mainly used in a solids control system for barite recovery, the cutting point is 5 to 7 microns, while the GNLW453C-VFD with a typical speed of 3000RPM, which is a high speed one, cutting point is 2-5 microns.
3. What’s the difference between longer centrifuge and shorter centrifuge? The length diameter ratio is an important factor of a centrifuge. The longer centrifuge is a centrifuge with a larger length diameter ratio. The bigger this value is, the longer time material stays in centrifuge, then the dryer separating result you could get.
For more information, welcome to visit GN website of contact GN sales directly.

GN Big Bowl Centrifuge Successfully Used for Railway Construction Project

Centrifuges are equipment with high efficiency and various applications. Centrifuges with different sizes are used for different applications.

Like among the GN Solids Control’s centrifuge models, the fixed speed 14 inch diameter bowl GNLW363 series centrifuges and GNLW452 decanter centrifuge with 18 inch diameter bowl are widely used for the oil and gas drilling solids control systems for the barite recovery. The VFD controlled GNLW363G, GNLW453 and GNLW553 series decanter centrifuges are used for the drilling cuttings waste management when working with a GN high G drying shaker or a GN Vertical cuttings dryer which are respectively for WBM and OBM and drilling fluids treatment projects, when working together with a chemical dosing system. GNLW223 and GNLW224 decanter centrifuges are mostly used for the diamond drilling projects and some projects with small treating capacities.
GNLW764 decanter centrifuge is a newly designed decanter centrifuge with a 30 inch big bowl, and a length bowl ratio as large as 4. It is specially designed for the big TBM projects, working after the shale shaker and desander plant. In some clients’ jobsite, there are 2 parallel desander units, each including one GNZS594 shale shaker and a GNZS594-2S12N mud cleaner. All fluids after treated by the 2 desander unit are transferred to the giant decanter centrifuge. On inlet of decanter centrifuge, there is a set of GNDW2000 Dewatering unit, it is used for chemical dosing for the centrifuge. It has 3 chambers for adding different chemicals for flocculating the extra fine particles into bigger ones, in order to be separated out by the centrifuge. Although after flocculation, the decanter centrifuge’s treating capacity is greatly reduced, GNLW764 could still handle a large capacity upto 90 cbm per hour.
Except for the giant centrifuge, other sections of the system are all designed into 20 ft containers. Even the shaker and mud cleaner are in frames with container corners. It is easy for transportation and layout.
If you need more information, welcome to contact GN Sales team directly.

GN Solids Control Equipment for 3 Rigs Sailing for Russia

In old China, in the agriculture world, the autumn is the best season of year, because it is the season for harvest and rewards of one year’s hard work. Now, in this autumn, GN Solids Control is being rewarded for its hard work, too. Although the big situation is not so good, GN Solids Control is working well, always have orders waiting.
Just early this month, at beginning of 2017 autumn, GN just delivered solids control equipment for complete 3 sets of drilling rigs for Russia, including:

GN solids control for Russia — GN provides 3 sets solids control equipment for Russia

Shale shakers of 9 sets: GNZS594E Shale shaker, linear motional shaker screens with 4 pieces composite material shaker screens. The screen area could reach 2.73 square meters
1. Mud cleaners of GNZJ594E-3S16N, with 3 of 10 inch desander cones and 16 of 4 inch desilter cones. For each solids control system, there are one set of mud cleaner.
GNZJ594E series mud cleaners share same shaker with GNZS594E shale shakers, with interchangeable spare parts for shaker parts and shaker screens.
GNLW decanter centrifuges of 6 sets. Decanter centrifuges are GN core products, and GNLW series decanter centrifuges’ sizes range from 9 inch to up to 30 inch. Big bowl middle speed decanter centrifuge GNLW452 are widely used for barite recovery of solids control systems and high speed centrifuges are used for waste management systems for the extra fine particles remove.
Centrifugal pumps, GNSB series centrifugal pumps are used for feeding the desander and desilter cones, and also for the mixing hoppers’ feeding.

Besides above mentioned equipment, GN also provide the mixing hoppers, mud agitators, mud guns and other equipment, mud tanks for solids control equipment, and also for drilling waste management system for both drilling cuttings and drilling fluid.

GN Big Bowl Centrifuge for Waste Water Treatment Projects

Comparing with the most commonly used 14 inch decanter centrifuges, the GNLW452 and GNLW453 Decanter Centrifuges of 18 inch bowl and GNLW553 decanter centrifuge of 22 inch bowl are already called big bowl centrifuges. In this case, the newly on show GNLW764A-VFD Decanter Centrifuge could be a giant centrifuge, because the bowl diameter is 30 inch while the length-diameter ratio is 4.4 to one.

This design is suitable for handling the large capacity with a single unit of centrifuge. And the special design and best material chosen makes the GNLW764 decanter centrifuge to have a good performance and longer service life.
Besides GNLW764A-VFD decanter centrifuge, GN also has designed GNLW554D-VFD decanter centrifuge, which is also of large length diameter ratio up to 4, it is quite suitable for the waste water treatment projects.
Just like all of GN high standard decanter centrifuges, GNLW764 and GNLW554 decanter centrifuge share all following features:

1. Electric components are of Siemens, ABB or Schneider, all of world best brands.
2. For the VFD control panels, GN provide positive pressurized control panel and has air conditioning system for cooling as option.
3. Bowl main body material is made of duplex stainless steel SS2205.
4. Impeller protection is with tungsten carbide tiles, for longer service life and easier keeping the dynamic balancing.
5. Solids discharge port is made of special ceramic or tungsten carbide inserts, to have a longer service life.
6. Flexible adjustable liquid level ponds, to change the drying level of treated material.

Also, for the CIPPE 2017 which was held in Beijing, GN Solids Control also showed the fully hydraulic decanter centrifuge, of 14 inch bowl diameter. It is preferred by some clients from extremely high temperature condition and where the electric power is limited.

GN decanter centrifuges are widely used for drilling rig solids control system, the drilling waste management system, for the dewatering system, for TBM project separation works, and also for the oily sludge separation projects and soil remediation projects.
If you have any question or need more information, please fell free to contact GN sales team directly or visit GN factory near Beijing, Capital of China.