2-PHASE SEPARATING DECANTER 3-PHASE DECANTER CENTRIFUGE
The 2-Phase Separating Decanter is a centrifuge in which the clarified and separated oil phase is gravity discharged on the decanter's liquid side while the heavy liquid phase leaves the decanter together with the solids.
The 3-Phase Separating Decanter is a centrifuge in which two liquids of different densities are separated from each other. At the same time solids are separated and discharged.
The feedstock enters the decanter through feed tube and flows into the centrifugation space through the distributor. The conveyor screw transports the solids to the solids discharge. The level of the liquid can be adjusted by fitting regulating rings or disks of the required inner diameter. Separation of the two liquid phases takes place in the separation zone, whereby the light phase flows towards the bowl axis, and the heavy phase towards the bowl wall.
Regarding the discharge of the liquid phases 3-Phase Separating Decanters are available in numerous designs. Liquid phases can be discharged by gravity or under pressure by centripetal pump.
In the case of a 3-Phase Separating Decanter with centripetal pump for the light phase and gravity discharge of the heavy phase, the light liquid phase leaves the centrifugation space over an exchangeable regulating ring and is discharged under pressure by the centripetal pump. At the same time, the heavy liquid phase is discharged under gravity through exchangeable regulating tubes.
Another technical variant is the case of a 3-Phase Separating Decanter with centripetal pump for the heavy phase and gravity discharge of the light phase. The choice of the appropriate design depends on the product to be separated and the lay-out of the customer installation.
SHEZNZHOU summationdrive
1.Drive with intelligent kinematics for high differential speeds and torques which enables processing of high solid capacities
2.Full torque up to the maximum differential speed; this allows processing of high solid capacities
3.High efficiency of the drive as the variable speed motor feeds in energy instead of braking
4.Automatic adaptation of the differential speed by means of frequency-controlled motor
5.Good accessibility to all drive parts
6.Changing the differential speed without replacing the complete gear
7.All product-contacting parts are made of stainless steel
Features & Benefits
All product-contacting parts are made of high-alloyed duplex steels, super duplex steels or Hastelloy C276. Depending on the application, the gaskets are made of NBR, FKM, FFKM, EPDM
Chemical cleaning after separation possible
Explosion-protected centrifuges available: · Gas-tight decanters from GEA comply with the test criteria of the strict European ATEX standard or other EX regulations · The oxygen atmosphere in the separator is displaced with inert gas and the excess pressure is maintained during operation to assure inert gas blanketing.
Available for temperatures up to 130 °C.
The 2-Phase Separating Decanter is a centrifuge in which te clarified and separated oil phase is gravity discharged on the decanter's liquid s
Shenzhou decanter centrifuge - the most versatile solid bowl scroll centrifuge in mechanical separation technology
How Do Decanter Centrifuges Actually Work?
A decanter is just a sedimentation tank wrapped around an axis. Solid particles that are heavier than liquid move to the bottom of the sedimentation tank by gravity and form a sediment (solid phase) at the bottom. A wine decanter, for example, can be thought of as a sediment vessel. The solid and liquid phases of a centrifuge are separated by centrifugal acceleration. The solid particles, which have a higher density and are hence heavier than the liquid, migrate outwards in the centrifuge's revolving bowl due to centrifugal force. The sediment forms on the inside of the centrifuge bowl's inner wall. The separation of solid particles from liquid is more faster and more efficient in a centrifuge because centrifugal forces of roughly 3000 g are applied instead of 1 g in a gravitational field.
Specification
|
Model
|
Diameter(mm)
|
Lenght(mm)
|
Max speed
|
L/D ratio
|
G-force
|
Capacity(m3/h)
|
Main motor power(Kw)
|
Weight(kg)
|
|
|
LW250*1000
|
250
|
1000
|
5000
|
4
|
2722
|
0.5-5
|
7.5
|
950
|
2120*1250*680
|
|
LW300*900
|
300
|
900
|
4200
|
3
|
2964
|
1-6
|
11
|
1160
|
2150*1300*900
|
|
LW300*1200
|
300
|
1200
|
4000
|
4
|
2784
|
2-6
|
11
|
1350
|
2450*1300*900
|
|
LW355*1160
|
355
|
1160
|
3600
|
3.3
|
2576
|
2-8
|
15
|
1400
|
2470*1350*830
|
|
LW355*1460
|
355
|
1460
|
3600
|
4
|
2576
|
2-10
|
15
|
1800
|
2750*1350*830
|
|
LW400*1200
|
400
|
1200
|
3200
|
3
|
2294
|
3-12
|
18.5
|
1800
|
2730*1600*1080
|
|
LW400*1600
|
400
|
1600
|
3000
|
4
|
2016
|
3-15
|
22
|
2000
|
3130*1600*1080
|
|
LW450*1800
|
450
|
1800
|
2800
|
4
|
1976
|
4-25
|
37
|
2500
|
3320*1700*1130
|
|
LW500*2000
|
500
|
2000
|
2800
|
4
|
1750
|
5-35
|
45
|
4000
|
3520*1800*1170
|
|
LW530*1855
|
530
|
1855
|
2600
|
3.5
|
2006
|
5-38
|
55
|
4680
|
3885*1350*1600
|
|
LW530*2120
|
530
|
2120
|
2400
|
4
|
1709
|
5-40
|
55
|
4800
|
4150*1350*1600
|
|
LW550*2000
|
550
|
2000
|
2800
|
4
|
2414
|
6-40
|
55
|
5700
|
4570*1380*1600
|
|
LW650*1950
|
650
|
1950
|
2200
|
3
|
1761
|
6-45
|
75
|
5000
|
4840*1510*1720
|
|
LW650*2600
|
650
|
2600
|
2000
|
4
|
1456
|
6-65
|
90
|
6000
|
5490*1510*1720
|
|
LW720*2160
|
720
|
2160
|
2000
|
3
|
1612
|
7-80
|
120
|
6000
|
5200*1600*1800
|
|
LW720*2880
|
720
|
2880
|
2000
|
4
|
1306
|
7-90
|
120
|
8000
|
3100*1600*1800
|
|
LW800*2400
|
800
|
2400
|
1800
|
3
|
1451
|
20-100
|
150
|
12000
|
5820*2000*1300
|
|
LW800*3200
|
800
|
3200
|
1800
|
4
|
1451
|
20-120
|
150
|
1300
|
7100*2000*1300
|
Shenzhou decanter centrifuge - the most versatile solid bowl scroll centrifuge in mechanical separation technology
Decanter Feed Pipe Inlet
The product is fed into the decanter scroll's inlet chamber through a centrally located feed pipe. It then travels through the distributor apertures into the decanter bowl after modest pre-acceleration.
Decanter Bowl
The cylindrical/conical decanter bowl rotates at a pre-set speed that is perfectly calibrated for the purpose. The slurry rotates at the working speed within the bowl, forming a cylindrical layer on the bowl wall. Under the influence of centrifugal force, the solids in the product settle on the inner wall of the bowl due to their higher density. The length of the cylindrical bowl section and the cone angle are chosen to fit the application's specific needs.
Decanter Scroll
The separated solids are conveyed toward the conical end of the bowl by the decanter scroll, which rotates at a slightly different speed than the bowl. The solids' residence period in the decanter bowl is determined by this differential speed. Cake dryness is influenced by the amount of time it spends in the oven. It may be modified by adjusting the scroll's differential speed, resulting in appropriate separation. Scrolls are constructed differently depending on the application and activity.
Solids Discharge
Settled solids are ejected into the solids housing through ports at the conical end of the bowl and fall through the discharge chute.
Overflow The cleared liquids (fluid phase) flow to the bowl's cylindrical end and exit through weir plates. The pond depth (liquid layer) in the bowl is regulated by extremely precisely adjustable weir plates (overflow weirs) in these apertures. The liquid is gathered in the drain housing and expelled via gravity.
Impeller
The clarified liquid can alternatively be expelled via an impeller and discharged from the bowl under pressure in a closed system as an alternative to the overflow weir. A separate chamber pump is no longer required. The adjustable impeller, a more advanced type, allows for infinitely changeable pond depth control during the run. This allows for quick and delicate adjustments to changing conditions without shutting down the decanter centrifuge.
Types Of Decanters
There are several types of decanter centrifuges currently utilized in the industry, the most widely recognized are vertical, horizontal and conveyor centrifuges. The principle behind a decanter centrifuge is based on the theory of gravitational separation. For example, if you fill a vessel with a mixture of mud and water, over time the weight of the mud will cause it to settle down at the base of the vessel. With the mud congealed at the bottom, the water will be forced upwards, creating a clear separation between the two.
Decanter Principles
A decanter centrifuge employs the same principles of gravitational force. However, unlike the glass mixture, the process is expedited through the use of continuous rotation. In fact, rotation provides anywhere from 1000 to 4000 times the normal gravitational force, reducing the time required for separation from hours to seconds.
Rotational Separation
The concept of rotational separation is similar to rides found at amusement parks and county fairgrounds. In these rides, placing yourself at an angle allows you to overcome the gravitational forces induced by rotation. Similarly, a decanter centrifuge is essentially a bowl tube that rotates at an extremely high speed. The bowl tube is equipped with an internal conveyor which moves in the same direction but at a different velocity.
Decanter centrifuge details
Decanter centrifuges process characteristics
The separation process in a decanter centrifuge relies on a few process characteristics such as centrifugal force or G-force,sedimentation rate and separating factor, differential speed between the conveyor and bowl, and clarity of the liquid
discharge.Decanter centrifuges require a centrifugal force for the separation of the solids from the liquid. This characteristic is dependent on the radius of the centrifuge and its angular rotational speed. A decanter centrifuge applies a force equivalent to several thousand G's, which reduces the settling time of the particles. It is also favored to maintain a large G-force, which wil result in an improved separation.The rate at which sedimentation occurs is an important characteristic of the decanter centrifuge separation process. The sedimentation rate is influenced by the particle size, the shapes of the particles, their differential densities and the viscosity between the particles and the liquid. This process characteristic can be improved by utilizing flocculating agents. The sedimentation rate is also dependent on the separating factor of the decanter centrifuge, which is related to the centrifugal force.The exterior bowl and the scroll conveyor rotate at different high speeds. This differential speed between the two is accountable for the sedimentation throughout the decanter centrifuge cylinder. A high differential speed results in a smaller residence time of the cake settlement, so it is necessary to keep the cake thickness to a minimum to avoid impairing the discharge quality.
Keeping the cake thickness to a minimum also aids in the improvement of the cake dewatering process. For this reason, it is necessary to obtain an optimal differential speed to balance the cake thickness and quality.The characteristic above all affects the clarity of the liquid output which is dependent on the volumetric throughout rate, where a higher flow rate will result in a poor liquid clarity. Another characteristic that influences the clarity of the liquid output is the differential speed. A low differential speed results in a better clarity, therefore, aiding in the separation process. The G-Force also plays a role in the clarity of the liquid discharge. Higher G-force results in an increase in the separation of the solid particles from the liquid and yields a better clarity.
How does it work
The feed product is pumped into the decanter centrifuges through the inlet. Feed goes into a horizontal bowl, which rotates. The bowl has is composed of a cylindrical part and a conical part. The separation takes place in the cylindrical part of the bowl. The fast rotation generates centrifugal forces up to 4000 x g. Under these forces, the solid particles with higher density are collected and compacted on the wall of the bowl. A scroll (also screw or screw conveyor) rotates inside the bowl at a slightly different speed. This speed difference is called the differential speed. This way the scroll is transporting the settled particles along the cylindrical part of the bowl and up to the end conical part of the bowl. At the smallest end of the conical part of the bowl, the dewatered solids leave the bowl via discharge opening. The clarified liquid leaves through a paring disc (internal centripetal pump).
3-phase separation with a decanter
With a 3 phase decanter centrifuge, it is possible to separate 3 phases from each other in one process step only. For example, two liquids which cannot be mixed because of different densities (e.g. oil and water) are separated from a solids phase. The heavy liquid (water) collects in the middle between the oil and the solids layer. Thus the two liquids separated from each other can be drawn off from the decanter. The solids are transported via the scroll to the discharge
openings as it happens also in 2-phase separation.Typical applications of 3-phase separation are the production of edible oils such as olive oil, oil sludge processing, the production of biodiesel etc.
Parameters and influencing factors of the separation
Feed, throughput and residence time
Through the feed, the separation medium to be processed can be input into the center of the infeed chamber of the scroll, where it is accelerated. The throughput will have an influence on the residence time.
Decanter Centrifuges Acceleration
The separation medium reaches its maximum speed in the decanter bowl, causing the solids to settle on the bowl inner diameter. A characteristic feature of the bowl is its cylindrical/conical shape.
Differential speed
There is a differential speed between the decanter bowl and the scroll, which is created by a gear unit on the
industrial decanter centrifuges. The differential speed determines the solid content in the outfeed.
Filling volume / Weir discs or overflow weir The clarified liquid flows to the cylindrical end of the bowl in the decanter centrifuge, from where it runs out through openings in the bowl cover. These openings contain precisely adjustable weir discs/weir plates by means of which the pond depth in the bowl can be set. The weir discs determine the filling volume of the bowl.
Advantages and limitations over competitive processes
Generally the decanter centrifuge has more advantages than disadvantages; however, there are some limitations when compared to other processes.
Decanter Centrifuges Advantages:
* Decanter centrifuges have a clean appearance and have little to no odor problems.
* Not only is the device easy to install and fast at starting up and shutting down but also only requires a small area for
operation compared to other competitive processes.
* The decanter centrifuge is versatile as different lengths of the cylindrical bowl section and the cone angle can be selected for different applications. Also, the system can be pre-programmed with various design curves to predict the sludge type, while some competitive processes, such as a belt filter press, cannot change the belt type to operate for different sludge types. Its versatility allows the machine to have various functions such as operating for thickening or dewatering.
* The machine can operate with a higher throughput capacity than smaller machines. This also reduces the number of units required.
* The device is simple to optimize and operate as it has few major variables and reliable feedback information.
* The decanter centrifuge has reduced labor costs compared to other processes, as it requires low continuous maintenance and operator attention.
* Compared to some competitive process such as the belt filter process, the decanter centrifuge has more process flexibility and higher levels of performance.
Decanter Centrifuge Application fields
1. Food
A Flesh processing,aquatic products processing and edibleprotein recovery;
B Extract plant protein from soybean,oily seeds andleguminous plants;
C Recovery of brewing leach liquor,malt and yeast;
D Treatment and recovery of wine lees liquid;
E Extract of instant coffee and tea;
F Clarification of palm oil,olive oil and seed oil;
G Extract juice from fruits ,berries and vegetables;
H Recovery of refined pectin; Clarification of grape juice and grape wine.
2. Environmental protection
Drilling mud,industrial efluentwaste water of municipal works, fertilizer,organic waste water,paint sludge ,plastic particles,gravel washing water,waste water in steel-making,fluegas desulfurization,sewage sludge treatment of waterworks.
3. Petroleum and chemical industry
A Processing of kaolin and calcium carbonate,production ofbentonite and titanium dioxide;
B Exploration of petroleum oil,natural gas,crude oil refiningand related industries,additive of lube oil and waste oil recovery;
C Intermediate products and final products of organic chemistry industry;
D Thermoplastic materials,includes PVC,polypropylene,polystyrene, synthetic rubber and fiber;
E Inorganic chemical industry,includes bleach,acid ,ilicaproducts and fertilizers;
F Treatment of spent wash and molasses fermentationresidues;
G Extraction of starch from wheat,corn,cassava and potato;
H Waste liquid recovery and recycling from above industries.
Company Profile
Liaoyang Shenzhou Machinery Equipment Co., Ltd.belongs to SHENZHOU Group. We are the professional manufacturer of Centrifuge & Separator, Liquid Filling Machine and packing machine. With many years producing experience, our factory have become leading manufacturer with professional technical team and Independent after-sale department.
Our international trade department can supply the whole project service. With many years development, we have known which factories have strong product with competitive price and we have built long-term and stable cooperation relationship with them. Our main area are the food and pharmacy project. Our successful project are coconut oil production line, liquid filling production line, packing production line and the tablet press production line, soft gelatin production line and so on. Our aim is providing you efficiently solution and superior after-service. We sincerely hope YOU are our next customers! Exported country: At present, our products have been exported to South Korea, India, Denmark, Russia, Georgia, Jordan, Bangladeshi, Tailand, Ethiopia, Finland, the United States, Canada, Australia, Spain, Japan, Colombia, Romania and so on more than 30 countries
Packing & Delivery
1.Parking:standard wooden box
2.Spare parts :we supply some parts and accessories for free.
3.Electronic module:it is made up of electronic control cabinet.
4.Special tools:we supply a set special tools for free.
FAQ
1. 12 months guarantee period from machine arriving date.
2. Abundant spare parts in stock are available to provide.
3. Our technicians could be dispatched for overseas service.
4. 7*24 hours technical consultation.
5. Your workers could get trained both in our factory and yours.
6. Routine tracing till the machine work properly will be done timely.
7. We will remind you to do the normal maintenance.
8. Your suggestions or any comments & reflection would be treated in priority.
9. Marketing team will visit you during our visit in your country if you require.
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