If you have already knew how to choose a decanter centrifuge, and already done some test, found out some valuable data with sample testing, it is successfully handled by the decanter centrifuge, and well knowing the size, expected performance, right scale, solid & liquid properties seems good too. Then also have some professional operator to run it. All seems perfect, then with a running centrifuge, is there anything you need to take care?
Below info. maybe a hint.
-Conveyor /Bowl Differential Speed
Find some good centrifuges here: http://gnsolidsaustralia.com/drilling-fluids/gnlw363fhd-full-hydraulic-decanter-centrifuge
This adjustment is probably the easiest to carryout and does not involve stopping the centrifuge. The effect of feed rate on performance can be generalised as follows.
The higher the feed rate the less residence time the liquid has in the bowl hence the harder to
settle out possible ultra fines. Conversely the lower the feed rate the longer the liquor residence time and hence the easier to obtain clear liquors and in some instances 100% recovery of solids.
Can be changed automatically with VFD drive, or manually with changing the belt / pulley, to change the G force.
Higher speed normally means better result, less moisture, more fine solids separated.
Whilst higher power consumption, more general wear and tear too.
This is not able to adjust while operating, normally rotate all the weir plates. Consequently the deeper pool depth, the shorter drying beach, then the wetter the discharged solids.
The effective pool length can be adjusted by feeding in one of usually mo feed compartments. By feeding in the feed compartment nearest to the liquor discharge end of the bowl, the effective pool length is shortened hence the least residence time for the liquid. Respectively the longer the pool the longer the residence time
-Conveyor /Bowl Differential Speed
The conveyor to bowl differential (Delta RPM) is altered by changing the bowl speed due ro the
gearbox. The gearbox itself can be changed for a different ratio, though an expensive change
once in the field.
The lower delta rpm, the longer residence time, and the dryer cake, but also less capacity.
Too low delta rpm may cause overloading the conveyor with solids
High concentration will cause poor separation.
The hotter feed, the less viscous, and the better result.
Generally for many many years, the principles and philosophy of centrifuge operation is not changed, the subject of centrifuge operation is complexed, and also simple, with combination of application experience, testing, or even designning, you will have your own invaluable knowledge about material, desired separation results etc.
Still GN Solids Control team is ready to be even more helpful.
This is a how to article and discuss how to find a proper decanter centrifuge, basically two things need to be considered: economic expectations and technical requirements. It is essential to clearly define the process, and pass this information to the centrifuge supplier at initial briefings.
The prospective user should also clearly define exactly what the centrifugal process is required to achieve. Fluid charactor before and after treatement, density, viscosity, solids content etc.
The whole process in your plan, before and after centrifuge. Does the material require clarification, classifi cation, degritting, thickening, dewateri.rg, washing or separating and repulping, and is the process a solidliquid, liquid-liquid or a three phase liquid-liquid-so1id duty?
Once the process is clearly defined, it is easier to identify variables such as the percentage of suspended solids, volumetric slurry throughput, solids throughput and the required product consistency at discharge.
Other consideration like G force, pH, for different applications.
Particle size, distribution arrd shape are also important factors when determining separation capabilities ald whether or not a batch or continuous centrifuge is the best option. Generally, materials which are predominaltly 45 microns and above and relatively incompactable are suitable for separation by filtration equipment, whereas finer or compactable materials lend themselves more to separation by sedimentation.
Decanter centrifuge are used to process unweighted and weighted, water-based and oil-based drilling fluids (muds). Mechanical energy is utilized to increase the gravitational force exerted on solids that are present in the mud system.oilfield Decanting Centrifuge are able to apply over 3,000 G-forces on the liquid/solids mixture, which separates the heavier solids from the lighter solids. Additionally, high G-forces separate fine solids from liquid.
Mechanical separation of solids from the mud system through the use of a decanter centrifuge is a highly-effective means of maintaining proper mud weight and viscosity. When used in conjunction with other Solids control equipment, decanting centrifuge enable users to maintain the mud properties within the prescribed range as per the drilling program. Typically,oilfield decanting centrifuge is the final processing units in the arrangement of solids control equipment.
GN Solids Control manufactures different type of decanter centrifuges, from 9in to 72in, and widely used in oil gas industry, now moving into other industries also.
Keep tune and find out more updated decanter centrifuges from GN. http://gnsolidsaustralia.com/drilling-fluids/gnlw363fhd-full-hydraulic-decanter-centrifuge
GN big bowl decanter centrifuge is always welcome all over the world, because of its good quality, well design, and good price also. Customized design also been done on the dosing unit, can be a 20ft whole container, or a stand alone unit, or any other composition.
GN Waste Decanter Centrifuge Features:
PLC Control Centrifuge Conveyor
High G Force up to max 3000. Big Volume Design.
Bowl Material Duplex Stainless Steel 2205 made from centrifugal casting.
Conveyor Wear Surface: Tungsten carbide tiles .The life is much longer than hard surface. And all tiles is interchangeable for easy maintenance.
Preasurized Explosiong Proof with PLC and HMI control for automatical operation.
All the bearings for the centrifuge are SKF
And can be used for Drilling Waste Management, water based drilling waste and Oil Sludge Treatment
Introduction of The GNDU2000 Series 20FT
Dewatering Unit provides a process of chemically enhanced configuration to remove the fine solids less than 5 microns from the water based drilling fluids. As it known that traditional solids control equipments like shale shaker, desander desilter, and decanter centrifuge will removes solids upper than 5 microns, for colloidal-size particles which is less than 5 microns will build up in the drilling mud system. To maintain the drilling mud properties, the operators have to dilute the drilling fluids with water, this consumes more water and create more drilling waste.
Centrifuges can be installed in a relatively small footprint; have a high washing capabiiity; produce low cake moisture; achieve a high capacity throughput and can provide the user with a totally enclosed and contained vapour-tight processing facility.
Centrifugal filtration is also considered to be one of the most effective methods of removing impurities.
Correct selection of a centrifuge is based on two key concerns: economic expectations ald technical requirements.
Once the process is clearly defined, it is easier to identify variables such as the percentage of suspended solids, volumetric slurry throughput, solids throughput and the required product consistency at discharge. Materials usually exit the centrifuge in a powdered or granular form, but there are some instances in which it can also be discharged as a paste. Product consistency will to some extent dictate the method of materials handling and trarrsportation.
The prospective user should also clearly define exactly what the centrifugal process is required to achieve. Does the material require clarification, classifi cation, degritting, thickening, dewateri.rg, washing or separating and repulping, and is the process a solidliquid, liquid-liquid or a three phase liquid-liquid-so1id duty?
Other considerations include the expected’G’ force; allowable cake dryness; allowable solids in the discharge liquors; product temperature; viscosity; specific gravity; pH and whether the process should be batch or continuous.
GN design and manufacture both decanter centrifuge and three-phase centrifuge for industry separation. Solid bowl decanter centrifuges have been operating according to the same basic principle since the 19th Century.
GN design specific centrifuges according to specific separation tasks and the use of resilient, high-quality materials have improved the performance of the centrifuges.
Moreover, GN owns a branch for design PLC and electrical control system; this gives GN advantages in electrical components for measuring and control technology. The performance and availability of the decanter centrifuge or three-phase centrifuges are significantly improved by the control system..
Main Application of GN Industry Centrifuges
Dewatering sludges / mud and suspensions
Thickening sludges or mud
Clarifying different type liquids
Separating 3-phase mixtures, i.e. two immiscible fluid phases and a solid phase
Classifying solids in a wet suspension by grain size
Separation of solids according to various densities