| Customization: | Available |
|---|---|
| After-sales Service: | 24 Hours on Line |
| Warranty: | 12monthes |
Suppliers with verified business licenses
Audited Supplier Audited by an independent third-party inspection agency
SHENZHOU-EV(Environmental Decanter) Series decanter centrifuges can be used on scrape or flush dairy and cattle feed lots, swine, poultry or other animal manure waste, lagoon sludge, or to dewater aerobic or anaerobic digester sludge. The decanter centrifuges can also be used on fish waste, algae, and other wetland applications. SENZ-EV decanter centrifuge can be used for manure separation and /or thickening prior to anaerobic digestion as well as for dewatering after anaerobic digestion. A wide range of manure slurry feed rates, feed solids concentrations and feed materials can be centrifuged. Minor coarse prescr eening or maceration is recommended for large and miscellaneous debris. No polymers or other additives required. Polymers can be used if solids removal levels in the high nineties are required.
Introduce of Automatic Continuous Discharge Decanter
Decanter centrifuge, horizontal solid bowl decanter centrifuge, separates continuously solid materials from liquids in the suspension, or to separate two liquid phases from each other simultaneous removal of solids. Decanter centrifuges have been widely used for continuous separation of suspended solids from liquids, clarification of solids, classification of fine particles, etc.
According to the purpose of use, decanter centrifuges can be divided into the following three categories, Clarifying Decanter Centrifuge, Separating Decanter Centrifuge, Classifying Decanter Centrifuge.
Clarifying decanter centrifuge is mainly designed for separating solids from liquid phase. Including dewatering process for maximum concentration of solids, or concentrating solids phase.
Solids-liquid Separation takes place in a horizontal cylindrical bowl equipped with a screw conveyor. The raw material is fed into the decanter centrifuge bowl through a inlet tube and is then smoothly accelerated by an inlet rotor. Centrifugal force immediately makes the solids build up on the wall of the bowl. The scroll conveyor rotates in the same direction as the bowl, but at a different speed, thus moving the solids towards the conical end of the bowl. The solids leave the bowl through the solids discharge openings into the casing. Centrifugal separation takes place throughout the entire length of the cylindrical part of the bowl, and the clarified liquid leaves the bowl by flowing over adjustable plate dams into the casing. In some cases, cleaned liquid phase is discharged out under pressure through built-in impeller.
The construction of a basic centrifuge with all its main components is shown in the above figure. The heart of the decanter is the rotating assembly, which comprises a mainly cylindrical bowl housing an Archimedian screw conveyor, with a small clearance between it and the bowl. One end of the bowl is conical in shape, providing the means whereby solids can be removed from it. Affixed to one end of the bowl is usually a gearbox to effect a small differential speed between the conveyor and bowl.
The rotating assembly, usually horizontal, is supported by a bearing in a pillow block at either end of the assembly. Surrounding the bowl is a casing to collect at one end the clarified liquor and dewatered cake at the other. The bearing pillow blocks are mounted accurately on a rigid frame together with the casing.
Sometimes the frame is mounted on a sub-frame together with the drive motor, and where necessary a back-drive system, to control the gearbox pinion shaft. which will in turn control the conveyor-to-bowl differential speed. The back-drive system will be described further, but for the present it suffices to say that it is essentially a braking motor or similar device coupled to the gearbox pinion shaft. The main motor is offset from the bowl and drives the bowl by means of a set of V-belts. The back-drive can also be offset. In which case it would be connected with a timing belt. The timing belt is to facilitate more accurate speed control. However, the back-drive system can also be mounted direct in line with the pinion of the gearbox.
The sub-frame assembly, or the main frame if there is not a sub-frame, usually is supported by vibration isolators.
The feed enters the bowl through ports in the conveyor, having entered the conveyor hub through a stationary coaxial feed tube projecting into the conveyor from a support, mounted on the main frame.
Feed slurry is metered through the feed tube into the rotating bowl. Suspended solids sediment to the bowl wall, where they are picked up by the conveyor and scrolled as a saturated cake to the conical end of the bowl, over the heel of cake which builds up in the small clearance between the bowl and conveyor. The resulting clarified liquor flows to the opposite end of the bowl and decants over weirs into the casing for discharge. The cake scrolls up the conical section of the bowl, the beach, before it falls into the casing for discharge.
The heel, the thin layer of process solids which builds up between bowl and conveyor, can progressively consolidate with coarser particles bedding themselves into it. This, while providing an aid to scrolling efficiency, can be an unwanted source of abrasion for the conveyor. However, generally, there is a tendency for the heel to move, albeit at a much lower rate than the cake itself. Thus there is a tendency for the heel slowly, but continuously, to regenerate itself.
Materials of construction are important considerations in the basic design. Most decanters are constructed with the parts in contact with the process in some form of stainless steel.
Separating decanter centrifuge, 3-phase decanter centrifuge, is mainly used for separating two immiscible liquids of different densities from each other, simultaneous removing solids.
The light liquid phase is discharged into the casing through radial holes in the large end hub. The heavy liquid phase is discharged through axial holes in the large end hub. The liquid radius for the light liquid phase is smaller than the radius for the heavy liquid phase. The liquid level is controlled by plate dams. In order to prevent the light liquid phase from leaving the bowl through the heavy liquid phase outlet, a separating plate is placed on the inside of the large end hub. The heavy liquid phase has to pass under the separating plate before being discharged into the casing. The liquid radius for the heavy liquid phase is controlled by plate dams. The solids are discharged under gravity.
The solid-wall bowl of separating decanter centrifuge has a cylindrical section for efficient separation and clarification of the liquids and a conical section for drying the solids.
The product enters the separating decanter centrifuge through the feeding pipe and passes through the distributor into the separation chamber. The liquid level in the bowl is adjustable via regulating tubes or overflow dam. Due to the centrifugal forces, the solid particles are flung onto the bowl wall. The hardfaced scroll conveys them to the solids discharge which is equipped with hard metal bushes. The solids are discharged under gravity.
The liquid phases are separated in the separation zone. The liquid radius for the light liquid phase is smaller than the radius for the heavy liquid phase. The layer thickness of the heavy phase is externally adjustable via regulating tubes or overflow dam. this changes the liquid level in the bowl. The light liquid phase moves in the direction of the bowl axis and is discharged under pressure via centripetal pump or under gravity. The heavy liquid phase moves in the direction of the bowl shell and is gravity discharged through regulating tubes or built-in impeller. In conventional design of separating decanter centrifuge, in order to prevent the light liquid phase from leaving the bowl through the heavy liquid phase outlet, a separating plate is placed on the inside of the large end hub.
Simultaneously separating liquid-liquid-solid mixture, which greatly saves energy consumption.
- Separating decanter centrifuge can handle a wide range of solids concentrations in feeding.
- Separating decanter centrifuge can flexibly respond to changes in the concentration of light-heavy liquid phases in raw materials
- When the liquid phase is discharged under pressure by the built-in centripetal pump, the downstream transfer pump is omitted.
- Separation of oil sludge containing oil from refineries, oil ponds, etc.
- Extraction of animal/vegetable fats and oils
- Starch manufacture for separating wheat starch and gluten
- Oil water and solids separation
- Coal tar treatment
- Biofuel production
- Lubricating oil additives
- Meat/poultry/fish processing
Classifying Decanter Centrifuge is mainly used for classifying of solids. Continuous separation of solids from suspensions with very high solids content of up to 60%, clarification of liquids, concentration of solids, classification of solids according to particle size.
Classification, the fractionation or separation of particles by size,could be considered as merely inefficient clarification. The cut, or desired classification, is adjusted by altering the classifying decanter centrifuge's efficiency. This is most easily done by altering the feed rate or bowl speed of classifying decanter centrifuge. However, adjustment of pond depth or differential may. in certain circumstances, be used.
In some classification applications. the required cut point is very sharp and the rheology of both separated phases is such that they remain quite fluid. In this type of application, the classifying decanter centrifuge's pond used would be relatively deep, and separation would be akin to a liquid-liquid separation, using a hydraulic balance under some form of baffle.
Very occasionally there will be found a classification application where it is required to separate two distinctly different particles. such as in the refining of minerals. In these cases, the two different substances to be separated may have markedly different densities. For classifying decanter centrifuge, it is particularly acceptable and quite advantageous when the denser material comprises the larger-sized particles. However, if this is not so. one must consider a combination of density and particle size for the cut point of each of the two substances, in relation to Stokes' law. One could visualize the situation of a large, low-density particle settling faster than a high-density, small particle. Thus for such a process to be feasible.
Each of the two solid constituents will have their own size distribution from which a cut point size can be chosen to give the desired purity of product and yield by classifying decanter centrifuge.
The solid-wall bowl has a cylindrical section for good separation and clarification of the liquid or classification of the solids and a conical section for dewatering the solids or concentration of the precipitated coarse particles.
The product is fed info the decanter through the feed and is conveyed to the separating or classifying chamber through the distributor. The liquid level of classifying decanter centrifuge can be adjusted by regulating plates. The coarse solid particles are forced to the wall of the bowl by the centrifugal force. The scroll conveys the precipitated solids particles to the solids discharge. The clarified liquid or the classified fine particles are discharged from the separating chamber via replaceable regulating plate.
- High product yield of the processed raw materials or preliminary products
- Optimized bowl design for large clarification area and therefore highest performance
- Dynamic stability of the frame design for a long service life and high safety
- Intelligent drive systems for simple differential speed adjustment available achieving optimum dry-substance values
- Overload protection and protected bearings ensure permanent and reliable operation
- Depending on the area of application, the scroll is faced with hard-metal for wear protection
- Corrosion protection for all components which come into contact with product by the use of stainless-steel materials
- Rotational hard-metal wear bushes in the area of the solids discharge double the service life of the bushes
- Ease of access to all relevant components reduces maintenance time
- Available with gravity or pressure discharge of the clarified liquid phase
- Chemical industry
- Mineral processing
- Starch technology
A decanter centrifuge works by exerting a high centrifugal force on the slurry of solids and liquids. A rotating conveyor pushes out the heavier solids that settle on the decanter wall. The lighter liquid exits the decanter through the liquid outlet port on the other end of the bowl.
Continuous process decanter centrifuges can process a large volume of fluids with sludge. Centrifugal force (upwards of 3,000 g) causes graded settling and separates the fluid from small sediment (50µ).
The rotating bowl has a concentric scroll that rotates at a differential speed to that of the decanter bowl. This speed differential allows the scroll to transfer the separated sludge.
The separation of fluid from the sludge occurs inside the rotating decanter bowl. One can explain the internal working as follows.
Decanter centrifuges are available in 2 configurations, namely 2-phase and 3-phase. In other words, solid-liquid and solid, liquid, liquid separation.
The two-phase separator is a solid-liquid separator. In other words, it separates the fed slurry into a solid phase and one liquid phase.
Most de-sludging duties use a two-phase design. These include industrial sludge thickening, municipal wastewater, hemp biomass separation, etc.
A 3-phase type separates solids from 2 immiscible fluids. In other words, a 3-phase decanter centrifuge produces a solid phase and two separate liquid phases.
For example, a 3-phase configuration separates crude oil from tank bottom sludge and water. Olive oil separation from water and biomass is another example.
Advantage of Automatic Continuous Discharge Decanter
Continuous production, closed operation, high degree of automation.
Good for greasy sludges. The Decanter Centrifuge is excellent for dewatering or separation of fats, oils and greases.
Large capacity in small space. The Centrifuge can offer a large solids handling capacity in a very small space. This is advantageous in large plants.
With lower capture or high polymer dosage rate, can sometimes achieve higher cake solids than the belt press filter. One reason for this is the large amount of shearing as the sludge is moved through the machine, and the temperature increase in the sludge from the power energy dissipated. Increasing temperature improves dewatering. High G force centrifuges can create cell lysis and this releases extra liquid, but these liquids are high in odour, some of which is retained.
Typical Applications of Decanter Centrifuge
|
|
Structural Diagram Automatic Continuous Discharge Decanter
Model |
Technical parameter | motor power | outline dimension(mm) | Machine weight (KG) |
|||||
| (Diameter)mm | Rotation speed rpm |
Length mm |
Separation factor G |
capacity M3/h |
Main motor KW |
Vice motor KW |
Dimension: L×D×H |
||
| LW250×1000 | 250 | 3600 | 1000 | 1813 | 1-3 | 7.5/11 | 4/5.5 | 2065×1050×800 | 1100 |
| LW360×1200 | 360 | 3500 | 1200 | 2467 | 3-8 | 11/18.5 | 7.5/11 | 2600×1500×850 | 1900 |
| LW360×1500 | 360 | 3500 | 1500 | 2062 | 3-8 | 11/18.5 | 7.5/11 | 2800×1400×850 | 2000 |
| LW420×1750 | 420 | 3200 | 1750 | 2406 | 4-20 | 30/37 | 11/18.5 | 3120×1580×1050 | 3000 |
| LW450×1600 | 450 | 3200 | 1600 | 2578 | 5-25 | 30/45 | 11/22 | 3780×1050×1180 | 3500 |
| LW450×1800 | 450 | 3200 | 1800 | 2578 | 5-25 | 30/45 | 11/22 | 3985×1050×1180 | 3600 |
| LW450×2000 | 450 | 3000 | 2000 | 2266 | 5─25 | 30/45 | 11/22 | 4320×1050×1180 | 3800 |
| LW500×1800 | 500 | 3000 | 1800 | 2517 | 10-30 | 37/55 | 15/22 | 4200×1110×1200 | 4300 |
| LW500×2100 | 500 | 3000 | 2100 | 2517 | 10-30 | 37/55 | 15/22 | 4500×1110×1200 | 4500 |
| LW550×1800 | 550 | 3000 | 1800 | 2769 | 10-35 | 45/55 | 18.5/22 | 4380×1160×1230 | 4800 |
| LW550×2200 | 550 | 2800 | 2200 | 2412 | 10-35 | 45/55 | 18.5/30 | 4780×1160×1230 | 5000 |
| LW650×1750 | 650 | 2000 | 1750 | 1454 | 20-50 | 75/90 | 30/37 | 4576×1300×1250 | 6000 |
| LW650×2000 | 650 | 2000 | 2000 | 1454 | 20-50 | 75/90 | 30/37 | 4900×1300×1250 | 6200 |
| LW800×2000 | 800 | 1800 | 2000 | 1450 | 40-100 | 90/110 | 45/55 | 6052×1460×2100 | 10000 |
| LW1000×2350 | 1000 | 1600 | 2350 | 1432 | 50-140 | 110/132 | 55/75 | 6850×1860×2300 | 12800 |
){kind=link}