Category Archives: Decanter Centrifug

Horizontal Decanter Centrifuge is designed for efficient and continuous separation of solids from suspending liquids by sedimentation and decanting, through the centrifugal settling principle. Centrifuge dewatering combines a compact design with efficient solids dewatering for maximum cake dryness.

centrifuges

A decanter centrifuge is useful in that it separates solids and liquids, and has become an essential component of water waste facilities and the chemical, oil, and food processing industries. Moreover, without a centrifuge, many of these companies would become so inefficient they could not function.

decanter centrifuge

Features & Benefits of DCS Series decanter centrifuges
1. Fully enclosed design/operation delivers reduced odor for plant and operators
2. High capacity in a small footprint provides efficiency and minimizes building and capital costs
3. Maximum cake dryness reduces handling and disposal costs
4. Fully automated operation and efficient process control provides optimum performance with reduced labor costs
5. Simple shut-down and flush cycle for minimal water consumption
6. Robust SS construction for wetted parts provides extensive abrasion protection, maximum uptime, and low maintenance costs

To be as a more than 10 years manufacturer of decanter centrifuges. DC Machinery can provide all kinds of models centrifuges. If you have any requirements of centrifuges, please contact us freely.

 

 

In order to fully understand how a decanter centrifuge operates, we must first define what a centrifuge does. In many industrial jobs, solid material often mixes with liquids, contaminating water supplies or turning mud into sludge.

decanter centrifuge1

A decanter centrifuge is useful in that it separates solids and liquids, and has become an essential component of water waste facilities and the chemical, oil, and food processing industries. Moreover, without a centrifuge, many of these companies would become so inefficient they could not function.

SONY DSC

Do you know what factors determine the performance of decanter centrifuges ? Please carefully read as below.
1.the centrifugal force required for sedimentation of the solids
2.the clarification area necessary to “capture” the solids
3.the differential speed required to transport the solids out of the decanter
4.the hydrodynamic design, which determines the exact parameters for the turbulence
5.the design of the conveyor and beach sections, which are important for efficient solids transportation.

If you meet any problems of the decanter centrifuge, please contact DC Office to get the solutions.

Centrifuges are used to process unweighted and weighted, water-based and oil-base drilling fluids. The DCGLW series centrifuge uses high G-forces to separate fine solids from liquids.

Mud is introduced in the feed chamber through a feed tube and exits in to the bowl via four nozzles. The DCGLW is able to exert up to 2,870 G’s on the mud. It has a fixed drive unit and has customized hardware and software packages that can be designed to meet specific installation and operation needs. With a processing capacity up to 200 gal/min the 3400 series centrifuge offers outstanding performance over a wide range of drilling applications and conditions.

SONY DSC

Features of DCGLW Series Decanter Centrifuge

1. Straight and cone section of the drum are made from 2205 duplex stainless steel material,adopt centrifugal casting process;
2. Remaining components of the drum assembly are made from SS316L;
3. Screw carrier adopts YG6 wear-resistant alloy sheet protection.With long life,easy maintenance and replacement;
4. Diversion port of screw pusher and slag-drip opening of the drum are protected by replaceable wear-resistant alloy sleeve,prolonging the service life and maintenance cycle.

DCGLW series decanter centrifuge is widely used in trenchless HDD, city bored piling, oil & gas drilling, Drilling Waste Management, tunneling construction, environment protection, chemical Industry, food industry, Pharmaceutical Industry, Oil Sludge Dewatering Systems, Coal Bed Gas Solids Control System, Oil Mud Separation, mining, Water Drilling etc.

 

Centrifuge-evaluation procedures in common usage develop an efficiency rating expressed in percentage barite recovery and/or drilled-solid injection. DCLW Series decanter centrifuge can be used for onshore and offshore drilling site based on its good quality.

DC solids control produce 3 models of high speed,middle speed, variable speed 2 phase centrifuges that separate solids from liquids. In all three models, the operating principle is theoretically the same.

Decanter centrifuge

Besides above DC Solid control company has developed a wide range of decanting centrifuge equipment to provide optimal results. In weighted drilling fluid systems, decanters recover as much as 95% of heavy barite, which is returned to be re-used in the active system, while also removing finer, lower-gravity solids. By discarding lower-gravity solids our equipment is able to maintain a higher level of fluid consistency and help produce higher drilling efficiencies.

Please find more information on DC solids control site. Or you can contact us freely. DC provides the high quality solids control decanter centrifuge, also other equipment.

 

Centrifuge used in well drilling mud solids control is decanter centrifuge, also referred as decanting centrifuge. It is rather popular with drilling contractors or fluids service company. Strictly speaking, centrifuge is the 5th purification or cleaning equipment for drilling fluid. It is set after desilter cone or mud cleaner. It is mainly used to separate solids sized 2~7 microns.

decanters

Description of decanter centrifuge

Decanter centrifuge including low speed, middle speed and high speed one. Different speed will produce different centrifugal force, treating capacity, and separation point. Centrifuge consists of scroll conveyor, drum, motor, differential, inlet port, discharge port, solid discard port, and so on. Decanter centrifuge will be fed by submersible slurry pump or screw pump with drilling fluid for finer separation of solid.

centrifuge

Centrifuge procedure

The material feeding into the inlet port, under centrifugal force generated by drum and scroll conveyor rotation, the solid will be dried and discharged via solids discard port. We know, on the centrifuge bowl or drum there are liquid zone and drying zone. Cleaned drilling fluids will flow out centrifuge via the clean liquid effluent at liquid zone end.

If you are looking for an oilfield decanter centrifuge that is highly effective and affordable, please browse our products. We offer a range of centrifuges of different sizes and capabilities that give you the exact results you need at a price that you can afford.

High speed has costs, not to the driller, but to the centrifuge owner. Suppose the centrifuge is one pound out of balance. If the centrifuge rotates at 900 RPM, the unbalanced load is 276 lbs, and this unbalanced load is carried by the bearings through to the frame. If it sped up too 1800 RPM, the unbalance load goes up to 1,104 lbs. To keep the centrifuge from shaking itself to death or an early bearing failure, higher speeds require better mechanical tolerances. Generally, to maintain these tolerances over a service life of many years, the centrifuge should be made from stainless steel.

decanter centrifuge

The second problem is stress. All of the mud in the centrifuge is pressing outward putting the bowl and hubs under stress. As the centrifuge is run faster and faster, the stresses build up and can cause catastrophic failure. No decanter centrifuge should be run faster, with a heavier weight mud than it’s designer planned on, and in addition, the structural parts should be in good shape. Corrosion and wear can weaken a centrifuge to the point where it is unsafe at any useful speed. Higher speeds require high strength, corrosion resistant materials.

centrifuge

The third problem is wear. Drilling mud contains grit; it slowly grinds the wearing surfaces of the centrifuge, and eventually enough metal is worn away that the centrifuge must be rebuilt. The wear rate is proportional to the g-force. At low speeds, the grit is ground into the metal at a moderate force, but doubling the bowl speed causes four times the wear rate. It cuts the service life to 1/4 of what it would be, and considering down time, easily increases the maintenance cost five fold.

In addition, as the centrifuge wears, it loses metal. It unfortunately doesn’t lose it uniformly, and as it wears, it goes out of balance. As I discussed previously, imbalance means premature failure through excessive vibration.

Deanter centrifuge is a very efficiency equipment for wasterwater process working progress. The centrifuge consists of a solid bowl, which rotates and contains the process. A screw conveyor, contained within the bowl, turns at a slightly different speed from the bowl.

DC Decanter centrifuge is an effective separation equipment which use centrifugal acceleration generated by high-speed rotation into the acceleration of gravity to shorten thousands of times of the settlement time of solid particles than in the gravity field. The solid particles are discharged from the drum through the screw conveyor continuously and without interruption.
decanter centrifuge

The material is conveyed to the screw discharge port through the feeding pipe and uniformly distributed in the drum through the spiral discharge port which is rotated at a high speed, and the main motor drives the drum to rotate at high speed through the belt to generate thousands of times of gravitational acceleration.

Rapidly settlement and accumulation of the solids particles in the inner wall of the drum, there is a relative movement of the screw conveyor to the drum, which will continuously push the sediment towards to outlet. The sediment is mostly dewatered under the combined action of the screw conveyor squeeze and drum dehydration. After the separation, the liquid is discharged freely through the liquid outlet point.

Features
1. Smaller Area Occupation: Centrifuge occupies only 1/5 of the other types of filter equipment with same process capacity.

2. High Automatic Degree: All process including startup, feeding, separation, discharge, washing, etc. are controlled by PLC with touch screen.

3. Safety Operation: Rotation parts equipped with safety cover. All processes are monitored by temperature, vibration, speed, electricity measurement. Ex-proof control panel and motor are applied.

4. Clean Operation Site: Well sealed operation, enable a clean and safe working site.

5. High Adaptability: Adjustable differential and speed to meet variable material and process request.

 

In order to fully understand how a decanter centrifuge operates, we must first define what a centrifuge does. In many industrial jobs, solid material often mixes with liquids, contaminating water supplies or turning mud into sludge.

centrifuges

A decanter centrifuge is useful in that it separates solids and liquids, and has become an essential component of water waste facilities and the chemical, oil, and food processing industries. Moreover, without a centrifuge, many of these companies would become so inefficient they could not function.

 

1) Inlet zone

The inlet zone accelerates the feed slurry up to the speed of the bowl. A properly engineered inlet zone keeps any degradation of the feed solids to a minimum as well as avoiding disturbance of the sediment in the bowl. A number of feed zone specifications are available for decanter centrifuges, each designed to ensure maximum performance in conjunction with a specific process.

SONY DSC

2) Screw conveyor

The key to good decanter performance lies in the efficient, effective scrolling of the sedimented solids. The design of the screw conveyor is therefore crucial. You must have the expertise needed to match the demands involved in specific industrial processes with specific configurations of flight pitch, lead angle and differential speed, in order to secure the best possible results.

3) Solids Discharge Section

Depending on the application, the consistency of the separated solids can vary from a dry powder to a paste. The configuration of the discharge zone is therefore chosen to enable such “cakes” to exit as effectively as possible. Innovative designs enables erosion-prone components used in the solids discharge zone to be replaced on site at low cost and with a minimum of disturbance to production.

4) Liquid Discharge Section

In a two-phase decanter, the liquid level is regulated by dam plates. In a three-phase centrifuge when operating in a three-phase mode, each phase discharges over a set of dam plates into separate baffled compartments in the casing.

Horizontal decanter centrifuge has the advantages of good separation performance, well-adapted, can be automatic continuous operated, exercise intensively is small, small footprint and lower maintenance cost. So the decanter centrifuge had a rapidly development recent years, which can be widely used in industrial wastewater and municipal wastewater process field.

SONY DSC

Main feature of the decanters centrifuge compared with others:
1.1 Separation factor is high: Max 4000.
1.2 Ration of length and diameter is big: Max 4.2.
1.3low energy consumption: 1/3~1/2 of the same product.
1.4 Smoothness Of Operation : Parts precision dynamic balancing and the whole set machine work dynamic balance, vibration strength of the decanter is below 5mm/s, is fall far below 《Technical condition of decanter centrifuges》, 7.1mm/s.
1.5 Low noise: less than 85Db(A).
1.6 Operating reliability: DC company decanters differential mechanism adopt planetary gear transmission in high speed, and adopt pin-cycloid planetary gearing in low speed to improve the working reliablity. Spiral drive main bear use roller bearing and the structure of the thrust ball bearing which can improve the bear ability of the Axial force.
1.7 Wear-resistant treatment: The touching part of our company is made of stainless steel and superior alloy steel, the blades of screw pusher paint abrasion- resistant alloy or spectacles special cemented carbide.
1.8. All kinds of models: The diameter series of the decanter produced by our company are 250、350、450、550, slenderness ratio is 2. 3. 4. ect.

SONY DSC

DC decanters centrifuge  widely used in oil, chemical, light industry, mining, metallurgy, food, environmental protection and ect, which can totaly meet the requirements of dehydration of solid, and liquid phase.

Before hydrocyclones and centrifuges became available for drilling applications, shale shakers and dilution were the only means of controlling the solids content of drilling fluids.

decanter centrifuge

Yesterday, DC Solid control company shipped 3 sets middle speed drilling fluid centrifuge to Russian drilling site. Centrifuge used in drilling solids control is the decanter type. Almost the centrifuge used at drilling site are horizontal type. There are bowl, drum, conveyor, motor, control panel consisted in centrifuge assembly. Of course, also the support base or base frame.

drilling fluid centrifuge

Decanting centrifuge in drilling fluids system is used after desilter cone or mud cleaner. It can handle the solids ranged 2-7 microns. There are middle speed and the high speed one, the fixed frequency or VFD one. Treating capacity / handling rate varies along with centrifuge size. Usually, it is from 30~60m³/h. We can select screw pump or slurry pump as feeding pump.

Please find more information on DC solids control site. Or you can contact us freely. DC provides the high quality solids control decanter centrifuge,