dewatering unit

GN Solids Control applied the technology of heating washing and chemical enhancing to treat oil sludge, oil slurry, waste oil and water.

Heating system of GN oil sludge separation system

GN Solids Control equips heating pipes inside mud tanks of the oil sludge separation system, and heating pipes and nozzles on coarse separation shale shaker. Clients can choose electrical oil heating system or electrical steam heating system for the application.

As the normal temperature is high enough. The function of heating is to reduce the viscosity of the oil sludge. Another reason of heating is to maximize the performance of chemical agents. The most suitable temperature for chemicals is around 70C degree. In some countries of Middle east, heating system is not necessary.

Chemical agents used for oil sludge and dewatering treatment

There are normally 3 types of chemicals will be used for oil sludge treatment. Clients can choose to use 1 or 2 or 3 types of chemicals based on the sludge situation and separation demands.
1) Sludge separating agent or surfactant: If the oil sludge viscosity is till high and difficult to separate after heating, sludge separating agent can be dosed before separation. The function is to improve the separation performance of the oil sludge.

2) Demulsifier: After sludge separation agent, demulsifier can be added to make the oil sludge emuisified, to remove the oil and water in the emulsified oil-water mixture.

3) Flocculant (PAM) or coagulant (PAC) : for ultra fine solids separation before enter into decanter centrifuge and disc centrifuge. If you already dosed demulsifier, you should consider and calculate carefully to see you add PAM / PAC or not. As demulsifier is to make oil, water and solids separated. But PAM / PAC is for flocculation. PAM / PAC will reduce the demuisifier performance and to make the oil, water and soil mixture again.

In some projects, acid or alkali will be dosed before separation to balance the PH. If you need to add acid or alkali, it is normally added before other chemical agents. The suitable PH can improve separation performance in some degree, but not much.

Oil and gas drilling, refinery, and crude oil production will all generate a large number of oil sludge waste.The oil sludge waste generated from drilling, refinery and crude oil production have complex composition, which may cause serious pollution to the surrounding environment and wasted resources. As this reasons, it is essential and necessary to treat the oil sludge waste, to reduce and minimize the waste in order to protect our environment.

GN Solids Control utilizes heating washing technology with chemical enhancing system to treat the oil sludge from oil and gas drilling and refineries. 2-phase / 3-phase decanter centrifuge and 2-phase / 3-phase disc centrifuge are used in GN oil sludge treatment system.  The major function of GN oil sludge treatment system is to reduce the solids and liquid waste volume before enter into superior processing equipment.

The water recovered from GN oil sludge system can be reused in the separation system, or use the water for injection. But the water cannot be discharged into environment. They need further slurry separation treatment before discharge. The recovered oil can be sold to refinery companies. The solids can be used as construction field material, like to to make bricks for road construction.

With suitable chemical dosing, below is the major parameters of soil, oil and water after separation from GN oil sludge separation system:

The Oil on Solids Discharged from Decanter Centrifuge is around 1-3%. The solids waste volume is greatly reduced, clients can send the solids waste to TDU company to treat. The cost will be much lower than you buy a TDU. As the cost of TDU and its operation cost is greatly high. Besides TUD, the clients can also use Biodegradation technology to further reduce OOC to 0.5% or less.

Recovery Oil from 3 phase centrifuge BS&W is around 2-3%. Clients can sell it to refinery company.

Oil Content in recovery water from 3 phase centrifuge is 1000-3000PPM. The recovered water can be reused for premixing tank inside the treatment system.
You can add a Water Treatment system to reach 50-100PPM (Oil Content, Water after treatment unit). Or you send the water to slurry treatment company to treat for you.

Oil sludge treatment, oil base mud and drill cuttings treatment is the major product made by GN Solids Control. Some clients do not know the difference of Oil sludge treatment system and oil base cuttings treatment system. They want to know the difference and know how to choose the right separation equipment.

Normally for OBM cuttings treatment, clients will separate cuttings and recover usable drilling fluids, and sell the drilling fluids. It is 2-phase separation. While for oil sludge treatment, clients will separate oil, water and solids. They do 3-phase separation.

Below are some general information to let clients know more about the different and about the equipment choosing.

1) As 3-phase centrifuge can only allow slurry with max. 10% solids content and particle size less than 2mm, 2-phase decanter centrifuge is must to be used before 3-phase separation to reduce the mud weight and solids percentage. After 2-phase centrifuge separation, the oil, water and soil mixture slurry flow into 3-phase decanter centrifuge to get oil, water and soil.

2) In order to remove as more ultra fine solids as possible, chemical dosing unit will be used together with decanter centrifuges for dewantering flocculation treatment. We quote you the 3-tank antomatic chemical dosing unit. It is used for powder chemicals. If you will use liquid chemical, pls tell me to revise the quotation.

3) Per our communication on Whatsapp. The pre-separation equipment for OBM cuttings and oil sludge is different. For pure OBM cuttings from shale shaker and mud cleaner, Vertical cuttings dryer is better. It can reduce the oil on the cuttings to 3% ~ 5%. It can remove more usable liquid. And the solids discharge is very dry.

But vertical cuttings dryer cannot be used to treat the soil sludge discharged from centrifuge. As its screen basket opening is 0.5mm, 0.35mm and min. 0.25mm. The soil cake from centrifuge is very fine and will all pass the screen opening.

4) Oil sludge is normally the mixture from different application, like drilling mud, drilling cuttings, soil cake from centrifuge separation, tank bottom slurry, slope oil, refinery waste oil slurry, industry waste oil, etc… The solids size and solids content is more complex. In this case, high G drying shaker is used for pre-seperation. And as the oil slurry is more complex, sometime, need to dilute and heating the sludge before separation. The solids waste discharge from High G drying shaker is with higher oil on the cuttings after separation. For example, before treatment the sludge with 15~20% oil content. After high G drying shaker, maybe around 10~15%, or even higher if the sludge with high viscosity and density.

Big bowl decanter centrifuge is a major separation equipment for oil sludge treatment. GN Solids Control makes 2-phase decanter centrifuge for liquid and solids separation, and 3-phase decanter centrifuge for water, oil and solids separation. The centrifuge bowl sizes are vary from mini size 9 inch to big bowl 22 inch size and the largest big bowl 30 inch.

Last week, some sets of GNLW554ET- VFD decanter centrifuge were shipped to an clients doing oil sludge treatment. GN Solids Control makes T Series Decanter Centrifuge mainly for dewatering treatment and for thickness.

GN T series decanter centrifuge for dewatering / Thickening is with beach angle of 8.5 degree. It is widely used for maximum dewatering requirements of municipal and industrial waste water sludge. The dewatering decanter centrifuge is designed for easy separation material include large particle size, high density difference of solid and liquid, low viscosity, high concentration, high treatment capacity and higher dryness than clarity. The materials like sludge or wastewater containing fine particles usually need to be added with flocculants to gather the fine particles condensed into large ones, and then dewatered with T series decanter centrifuge.

Applicable Material of GN Solids Control T Series Decanter Centrifuge can be used to treat below materials, but not only limited to them: Drilling mud, environmental protection sewage, oily sludge, cutting fluid, sand washing water, mineral washing water, soda white mud, salt mud dewatering, magnesium aluminum emulsion, steel-making waste water, precision casting waste water, construction mud, tunnel mud, mine waste water, industrial waste water, organic waste water, aquaculture waste water, chemical industrial waste water, printing and dyeing waste water, municipal sewage, river sludge, water plant sludge, lake sludge, kaolin grading, calcium carbonate, bentonite, Silica, titanium dioxide, calcium sulfate, barium sulfate, conductive film glass polishing solution, aluminum hydroxide, cryolite, silicate, oil sand separation, landing oil, oil sludge, coal tar, inorganic fertilizer, Chinese medicine extraction such as taxus chinensis, honeysuckle and liquorice, clarification, concentration and dehydration of salt crystals, etc

The most popular bowl size used for oil sludge separation is 9 inch, 14 inch and 22 inch decanter centrifuge. For the 3 bowl sizes, GN Solids Control has 2 model series to suit for different material situation. The 2 model series are defined per the ratio of bowl length and bowl diameter. GNLW223, GNLW224, GNLW363, GNLW364, GNLW553, GNLW554.

Regarding the 3 bowl diameter 9 inch, 14 inch and 22 inch decanter centrifuge, the ratio of bowl length and bowl diameter can be 3 or 4. The ratio 3 serials decanter centrifuge can be used for oil and gas drilling fluids treatment. The ratio 4 decanter centrifuge is specially designed for oil sludge treatment and waste water, waste oil treatment.

GN screw press dewatering unit is designed and made to treat sludge and sewage waste water. GN screw press dewatering machine is widely used in sewage treatment projects of municipal, aquaculture, food, starch, oil, pharmaceutical, chemical, paper, leather and other industries.

GN screw press dewatering unit is a kind of economic and environmental friendly sludge dewatering treatment product. It is a new type of sludge extrusion dewatering equipment by using the principle of screw extrusion, through the strong squeezing force generated by the change of screw diameter and screw pitch, and the tiny gap between the floating ring and the fixed ring, to realize solid-liquid separation.

GN dewatering screw press unit includes below items:
1.PLC Smart control electrical panels for automatic control.
2.Chemical enhancing dewatering system for mixing and dosing flocculants into the waste water, slurries or sewage.
3.Sludge thickening and dewatering device
4.Liquid collecting tank to receive the recovered water from the screw press treatment.

GN dewatering screw press unit is with automatic control technology, which can mix and enhance flocculants automatically. After chemical enhancing, the screw dewatering press unit can running continuously to complete the sludge thickening and squeezing, finally return or discharge the collected filtrate liquid.

Besides dewatering screw press unit, GN Solids Control also makes automatic tank cleaning system. GN system is running automatically after preset parameters of the control panel. By adding the right tested chemicals, operators can achieve a satisfied liquid separation result. It can save time and save water in this case to further save cost. Some users of automatic tank cleaning system mentioned that, before without the automatic tank cleaning system they took 4 ~ 5 workers to clean one tank with 4-6 hours, now they just need 2 workers to clean one in 2-3 hours. It saves 80% man power and operation time.

If clients could share some technical demands, GN Solids Control is willing to check with engineering team and offer a customized solution to suit for clients; projects.

After oil and gas well drilling, there are a lot of drilling fluids cannot be used, as the drilling job is finished. The drilling mud may come from the usual solids control equipment which is used for oil well drilling mud recycling system, like from shale shakers, desanders, desitlers, mud cleaners, designers, degassers. And in some oil well drilling rig sites, the drilling mud may come from the decanter centrifuge separation.

And the drilling fluids are hazardous to environment. They are not allowed to be discharged into environment directly. Clients need to treat the used drilling mud after drilling well finished. The solid equipment mentioned above are used for the circulation of drilling mud. But after drilling, there should be another separation equipment to treat the recovered clean drilling fluids. The new approach is to dewater the drilling mud after use of drilling mud to reuse water.

Drilling mud used in oil well drilling is recovered from solids control equipment like shale shaker, mud cleaner, desander, desilter and decanter centrifuge, there is no big size solids side the solids. The PSD (particle size distribution) is variable but around figure will be 30% of below 5 microns. If it is water base mud, the water content is around 80 ~ 90%. And the solids content is 10 ~ 20%. There is no oil for water base mud.

In this case, clients will need to do dewatering treatment to recover the water from drilling fluids for reuse. This is a conventional dewatering of water base mud to produce reusable water and the challenge is on the economic side as the effluent water must be of the same price compared to landed price to rig site of fresh water. After dewatering treatment, clients want to get Semi clear water with neutral pH reusable (water parameters still to be determind).

If you are interested for the proposals to dewartering the used drilling mud from oil well drilling, please visit the GN Solids Control website:
Or contact GN Solids Control sales engineers.

GN Solids Control is a professional manufacturer for liquid and solids separation. In order to rich the company’s product lines, GN Solids Control developed a separation brand: GN Separation. GN Separation (www.gnsepararation) is a separate brand developed by GN Solids Control.

GN Solids Control major business is oil and gas drilling mud separation and waste management, non-oil field drilling fluids cleaning and recycling, replacement shaker screen manufacturing, like solids control shale shaker, high G drying shale shaker, desander mud cleaner, desilter mud cleaner, degasser, decanter centrifuge, vertical cuttings dryer, centrifugal pump, jet mud mixing system, mud agitator, etc…

GN Separation is focusing on making more industrial separation equipment, like various sizes industry separation decanter centrifuge, disc centrifuge, 3-phase separation centrifuge, screw conveyor, etc…

This week, GN Solids Control and GN Separation will exhibit at IE Expo China 2020 in Shanghai. IE Expo China is exhibited in Shanghai Every July. It is the largest professional exhibition focusing on environment protection and solution:

http://www.ie-expo.cn/Overview/profileGN Solids Control and GN Separation will take the typical waste management equipment for showing to the clients. Unlike other equipment supply, they can only make some of the separation equipment, some one can only make shale shakers, some one can only make centrifuges, some one can only make chemical dosing system. GN Solids Control makes the full line separation equipment, and GN Solids Control is capable to combine the system to be a full function system. Below is the major production for the exhibition:

1) Oily sludge separation system.
It is a 1-skid modular unit C/W shale shaker separation, waste management high speed decanter centrifuge for liquid and soil separation, chemical dosing system, disc. Centrifuge for soil water and oil 3-phase separation. Transfer pumps, level meters, control panel, storage tanks, pipelines and other necessary accessories are included in the system in order to offer turn key solution to clients.

2) Slurry separation decanter centrifuge. GN Solids Control and GN Separation is capacity to make different bowl sizes centrifuges.

3) Sludge and solids transfer vacuum pump for long distance suction and discharge.

 

 

GN Solids Control is a professional manufacturer to make different sizes Solids Removal Variable Speed Centrifuge includes stand, feed pump and connecting hoses, and other processing equipment and accessory processing equipment before and after decanter centrifuge.

GN Solids Control makes Variable speed from 0 up to 4,000 RPM per different models. GN Solids Control is capacity to make both VFD control decanter centrifuge and full hydraulic drive (FHD) decanter centrifuge per meet clients’ request.
GN Solids Control brand decanter centrifuge is designed with high G-force to get a better separation performance.

GN Solids Control has big bowl decanter centrifuge vary from 18 inch to 22 inch, and max. to 30 inch for big fluid processing rate. In the world, few companies have the capability to make big bowl decanter centrifuge up to 30 inch. GN Solids Control is one of them who have the abilities.
GNLW553 VFD decanter centrifuge is a 22 inch bowl decanter.
GNLW453 VFD decanter centrifuge is a 18 inch decanter.
GNLW363 VFD decanter centrifuge is a 14 inch decanter.
Roughly, for the same conditions, 1 set 22inch decanter = 2 x 14 inch decanter centrifuge.

And 1 set 18 inch decanter = 1.4 x 14 inch decanter. The operators cannot expect to use an 18 inch decanter centrifuge to replace 2 x 14 inch decanter or to replace a 22 inch decanter.

GN Solids Control 14 inch, 18 inch and 22 inch decanter centrifuge can all be used for heavy mud solids control. And also some clients want to use the decanter centrifuge for different applications like for barite recovery, HGS (high gravity solids), LGS (low gravity solids), waste management, and dewatering treatment, or other different applications, the centrifuge features are not all the same. When GN Solids Control makes the design for standard models, GN Solids Control need to balance the performance for all the situations. If clients have fixed applications with the centrifuge, suggest clients to share the information to GN Solids Control sales engineer before order to get and best solution to suit for the projects and maximized the separation performance.

 

5 sets of high speed big bowl decanter centrifuge start to service at a power plant for dewatering application. The model of the 5 sets big bowl decanter centrifuge for dewatering is GNLW454E. It is a 18 inch big bowl decanter centrifuge specialled designed for waste water treatment.

Compared with normal big bowl decanter centrifuge, GNLW454E has a bigger ratio of bowl diameter and bowl length. The ratio is up to 4. It means the slurry will go through a longer separation path while going through the bowl. So the liquid can will be clean while be discharged, and the solids phase will be more drier.

The working principle of the decanter centrifuge is as follows: the decanter centrifuge bowl and the screw conveyor rotate at the same direction and at high speed. But the rotating speed of bowl and screw conveyor is not the same. In this case, there will be a certain differential speed between centrifuge bowl and screw propeller. And the differential speed is at the same direction with centrifuge bowl and screw impeller rotation.

The material is continuously introduced into the inner cylinder of the screw conveyor through the feed pipe, and enters the bowl after acceleration. The lighter liquid phase forms an inner liquid ring, which overflows the bowl continuously from the large-end overflow port of the bowl, and is discharged, out of the bowl through the liquid discharge port at another end.

Besides GNLW454E 18 inch decanter centrifuge, GN Solids Control also has other sides centrifuge models for various applications.

9 inch decanter centrifuge: GNLW223, GNLW224 series
14 inch decanter centrifuge: GNLW363, GNLW364 series
18 inch decanter centrifuge: GNLW452, GNLW453, GNLW454 series
22 inch decanter centrifuge: GNLW553 series
30 inch decanter centrifuge: GNLW764 series
Besides decanter centrifuge, GN Solids Control makes dewatering unit, oil water separator, shale shaker, mud cleaner, and other separation equipment.

18 inch is a popular big bowl decanter centrifuge which is widely used for drilling mud treatment and drilling waste management. But for different applications, clients’ demands for the output liquid and output solids / soil varies greatly.
For example, when the 18 inch decanter centrifuge is used as solids control equipment in drilling fluids processing system for barite recovery, or for mud weight reducing, big treating capacity is demanded.

The jobsites want to get a big drilling fluids input and output, When the jobsites want to reduce mud weight to a qualified PPG, they want to reach a bigger mud input into the decanter centrifuge, and the output liquid can be reduced the qualified mud weight. But they do not have specified demands for the solids outputs from the decanter centrifuge. For this applications, a bigger conveyor speed (differential speed) can push the input drilling fluids go through centrifuge internal screw propeller faster.

If the mud can pass through the centrifuge internal bowl faster, the total mud volume going through the centrifuge in a certain time is bigger, it means bigger capacity. Furthermore, specified liquid dam boards are used in this application, the purpose is to enlarge the solids output volume. During this operation, the operators can get bigger handling capacity.

But if the big bowl decanter centrifuge is used for dewatering, or used for water / liquid purification, a relative lower conveyor speed (differential speed) and high bowl speed should be used. The purpose is to extend the rotation time of the materials inside the centrifuge bowl, and in order to extend the separation time of the material along the bowl screw. After centrifugal force separation, the purified liquid (maybe water with ultra-fine soil) is discharged from the liquid output port. Soil will settle down along the bowl screw and then been throw out from the solids output port.

In order to choose the right decanter centrifuge model and type, the clients should contact GN Solids Control sales engineer to communicate the material situation for the right model recommendation.