3 phase decanter centrifuge is used to separate two liquid phases from one solid phase at the same time. As is known, decanter centrifuge principle of separation is by G force. Because of the different densities of the (immiscible) liquids and the solid , so all three phases can be discharged simultaneously using the 3 Phase decanter centrifuge. Shenzhou design and manufacture three phase decanter in different bowl size include: 355mm, 420mm and 500mm.520mm,650mm.
Fish oil, a valuable byproduct of fish processing, has gained prominence for its health benefits and industrial applications. Extracting high-quality fish oil involves intricate steps, and one crucial tool in this process is the 3-phase decanter centrifuge. Let's dive into the science behind this remarkable equipment.
The most important facet of fish meal and fish oil production is efficient separation of the three main components of the raw material - dry substance (protein), fat and water while keeping contact time to a minimum. Central to the process is the heating stage which brings about coagulation of the protein and opens up the cells containing the fat to release the oil. This stage is critical for the quality and yield of the end products.
However, to do the 3 phase separation, the solid phase must be the specifically heaviest phase and the two liquid phases should have different densities.
The structure and principle of the three phase decanter centrifuge are similar to the two phase decanter centrifuge. The difference is the way of the liquid discharged. There are two liquid phases in separation in a 3 phase decanter centrifuge. A higher density liquid phase is discharged under pressure, and the lower density liquid is discharged without pressure. Following is the principle drawing of the 3 phase decanter centrifuge.
Conventional process for the recovery of fish meal and fish oil
Separation is affected mechanically in presses and by separating water and fat, and thermally by evaporation and drying. The mean water content of the raw material varies between 65% and 75%, and it is thus self-evident that the separation of water is an important factor in the production process. Depending on the type and condition of the raw material, industry fish and fish waste are processed into fish meal and fish oil either in a conventional method, i.e. cooker-screw-press decanter, or in the conventional process, cooker-decanter-screw press. The processing plant is state-of-the-art, enabling all species of fish to be processed with acceptable throughputs and analyses of the end products. These processing plants are fully automated from the raw material feeder to the bagging of whole meal or the storage of pure oil.
How does a 3-phase decanter centrifuge work?
The 3-phase decanter centrifuge design ensures separation of the incoming press water into three phases - fish oil, solids and water. The press water is fed into the bowl through a stationary inlet tube and is then smoothly accelerated by an inlet rotor. Separation takes place in a horizontal cylindrical bowl equipped with a screw conveyor. Centrifugal force causes instant sedimentation of the solids on the wall of the bowl. The conveyor rotates in the same direction as the bowl, but at a different speed, and conveys the solids to the conical end. Because it is lighter, the fish oil flows on the inside, and the solids move towards the outer perimeter, while the water remains in the middle. Separation takes place along the entire length of the cylindrical part of the bowl. Fish oil and water are separated in the liquid Zone and are decanted and discharged from the bowl through two discrete discharge systems to prevent cross-contamination. The water phase is discharged through axial holes in the large end hub, and fish oil phase discharged out of the bowl under pressure by adjustable impeller.
What is a 3-Phase Decanter Centrifuge
3 phase decanter centrifuge is a widely used equipment for separation of solids, heavy liquid and light liquid with specific gravity difference. In many of morden industries like oily sludge treatment, slaughterhouse wastewater treatment, kitchen waste treatment, oil clarifying, fish products, wheat starch production, etc. SHENZHOU Separation is one of manufacturers who provide 3 phase decanter centrifuge with based on more than ten years of practical experience.
Beijing (PRWEB) - In the Separation Industry, 3 phase separation technology are more and more popular. Especially the industry required high efficiency 3 phase decanter centrifuges for oil and water separation. SHENZHOU 3 phase decanter centrifuge is developed by SHENZHOU Company based on more than ten years of practical experience in the separation field. Its main function is to solve the separation of solid phase and two immiscible liquids at one time based on the specific gravity difference. Relying on mature desiSHENZHOU and high-quality raw material selection, SHENZHOU 3 phase decanter centrifuge can meet the requirements of 24-hour continuous and stable operation.
Adjustable impeller
The adjustable impeller (skimmer), which is so called centripetal pump, allows the interface between the two liquid phases to be optimally adjusted without centrifuge stop if changes in the density differential or in the quantity ratio of the two liquids occur. The adjustment during the operation of the centrifuge ensures maximum purity of both liquid phases. Decanter centrifuge with discharge of clarified liquid under pressure. With this design clarified liquid is discharged foam free and under pressure by a adjustable centripetal pump (paring disc).
1. Brief of 3 Phase Decanter Centrifuge
1.1 Working principle of 3 Phase Decanter Centrifuge
SHENZHOU 3 phase decanter centrifuge is composed of 7 major mechanisms, including feeding component, underframe component, bowl component, screw component, differential gear box, drive component and collection box component. The materials to be separated are sent into the feeding component by the conveying system, and then flow into the inner cavity of the bowl, rotating synchronously with the bowl. Due to different specific gravity, the centrifugal force is different, heavy solid particles will get the largest centrifugal force, followed by heavy phase liquids (such as water), and the smallest for light phase liquids (such as oil). In this way, a concentric solid layer and two liquid layers are formed from the outside to the inside according to the centrifugal force. Under the relative motion of the bowl and the screw, the solid deposited on the inner wall of the bowl is pushed to the solid outlet direction of the machine by the screw, further dried under the extrusion, and then discharged; The liquid phase flows to the outlet of the liquid phase at the other end of the machine and overflows at different outlets, realizing three-phase separation of solid phase, heavy liquid phase and light liquid phase. SHENZHOU three-phase decanter centrifuge adopts centripetal pump technology to adjust the position of neutral layer of heavy liquid phase and light liquid phase, and can select the appropriate position of liquid discharge layer according to different liquid phase proportion. At the same time, the centripetal pump is also the flow outlet of heavy liquid phase, which is convenient for pipeline layout.
3-phase Decanter Centrifuge for Fish Oil process, the raw material is heated in a cooker to coagulate the protein whilst the fat-containing cells are gently disintegrated so that the oil is released. The cooked raw material is fed to a screw press before a 3-phase decanter centrifuge separates the press water cleanly into solids, water and oil. Shenzhou offers several discharge systems for 3-phase decanter centrifuges. The two liquid phases can either be discharged freely or via adjustable impeller. In the case of adjustable impeller, the separation zone in the decanter centrifuge bowl can be externally adjusted. The separated solids are directly conveyed to the dryer along with the press cake from the press. The stickwater or heavy liquid phase from the decanter centrifuge is evaporated before it is dried and processed into fish meal. As the oil phase from the decanter centrifuge may still contain small residues of free water and solids, a 3-phase disc separator for polishing is recommended downstream to remove even those tiny impurities. The result is purest fish oil.
1.2 Separation Range of 3 Phase Decanter Centrifuge
A. When the viscosity of liquid phase is small and the particle size of solid phase is large, the specific gravity difference between solid, liquid and liquid is required to be ≥ 0.05g/cm3 (solid heavy, liquid light).
B. When the liquid viscosity is small and the specific gravity difference between solid and liquid is large (the specific gravity difference is ≥ 1g/cm3), the solid particles shall be ≥ 0.005mm and the specific gravity difference between liquid and liquid shall be ≥ 0.05g/cm3.
C. When the liquid viscosity is large or the solid-liquid specific gravity difference is small and the solid particles are very small, the separation effect will be siSHENZHOUificantly reduced, even the equipment is not applicable.
D. When the solid particles are easy to be damaged, the separation effect will also be affected.
2. Comparison between 3 Phase Decanter centrifuge and other centrifuge equipment
2.1 Comparison with 2 Phase Decanter Centrifuge
SHENZHOU 2 phase and 3 phase decanter centrifuges are branches of horizontal decanter centrifuge and their basic working principles are the same. The equipment relies on the high-speed rotation of its rotating assembly to form an acceleration thousands of times of the gravity acceleration inside the bowl, so that the substances to be separated will be stratified due to different densities; Then, through the differential gear box of the equipment, the bowl and the screw generate relative motion, so that the separated substances can be output. The difference is that the SHENZHOU 2 phase decanter centrifuge is used for solid-liquid two-phase separation, and the solid slag and separation liquid are discharged from the opening at the bottom of the equipment collection box; While SHENZHOU 3 phase decanter centrifuge adopts centripetal pump technology, which can realize solid liquid liquid three-phase separation. Solid slag and light liquid phase are discharged from the bottom opening of the equipment collection box by gravity, while heavy liquid phase is discharged through the flow outlet on the impeller under the pressure of the centripetal pump. In the world, there are also three-phase decanter centrifuges with heavy liquid and light liquid phase outlets provided by other equipment suppliers that are contrary to the desiSHENZHOU of SHENZHOU Company, which is not to be detailed here.
2.2 Comparison with 3 Phase Disc Stack Separator
Different from 3 phase decanter centrifuge, 3 phase disc stack separator belongs to the category of vertical centrifuge. The rotating assembly rotates at high speed with the Y axis as the centerline, and the centrifugal force acceleration generated is one level higher than that of the three-phase decanter centrifuge. Therefore, the three-phase disc stack separator has better separation effect for solid-liquid or liquid-liquid separation with small specific gravity difference. It is worth noting that three-phase disc stack separator are often used for the treatment of materials with low solid content (no more than 3%), such as the clarification of liquid phase. Therefore, in some treatment processes, three-phase decanter centrifuges and three-phase disc stack separators are often used in series as upstream equipment and downstream equipment. First, use a three-phase decanter centrifuge to separate most of the solid phase from the material, and then use a three-phase disc separator to separate the heavy liquid phase (such as water) and light liquid phase (such as oil). In this way, the respective advantages of the two devices can be better used to improve work efficiency and obtain better processing effect. SHENZHOU is also able to provide three-phase disc separator and two-phase disc separator to meet the diversified needs of customers.
3. Applications of 3 Phase Decanter Centrifuge
In practical applications, three-phase decanter centrifuges are often used as oil-water separation equipment. To achieve oil-water separation, a prerequisite is that oil-water mixture is non-emulsified, that is, it can be stratified under the condition of natural precipitation. The following are some common applications of three-phase decanter centrifuge.
3.1 Oil Sludge Treatment
The petrochemical industry often produces some waste oil sludge, mainly from the landing oil sludge at the oil field drilling site, the oil sludge at the bottom of the crude oil storage tank and the waste oil sludge in the production process of the refinery. The oil sludge treatment system independently desiSHENZHOUed by SHENZHOU is a set of reduction treatment solution specifically for these sludge. After chemical de-mulsification treatment and coarse filtration, three-phase separation of oil, water and solids residue is required. SHENZHOU three-phase decanter centrifuge is the main equipment for three-phase separation of oil sludge system. The separated oil can be sent back to the refinery for further processing. The oil content in the discharged solid residue is less than 3%, which provides great convenience for subsequent thermal desorption or biodegradation treatment.
3.2 Hogwash Fat Treatment
Hogwash, also known as kitchen waste, is a kind of food processing waste and food residue produced by food processing. Its composition is complex, with high water content and high oil content. If it is not handled in time, it is easy to rots, deteriorates and breeds parasites, molds and other harmful substances. Three phase decanter centrifuge is ideal equipment for kitchen waste disposal. The kitchen waste mixture after high-temperature cooking is crushed and filtered by the pulping machine, and then enters the three-phase decanter centrifuge for treatment. The separated solid residue enters the slurry mixing buffer tank for dilution and then undergoes anaerobic fermentation treatment or is made into organic fertilizer. The separated oil phase is used to extract biofuel after impurities are removed, and the heavy liquid phase can be converted into biogas through anaerobic fermentation.
3.3 Disposal of Byproducts in Slaughterhouse
Fat melting plants process slaughter by-products, such as cowhide, which are suitable for further use as food. Generally, there are two different processes for dealing with these by-products. After grinding and heating products, three-phase decanter centrifuges are traditionally used for separation in the first stage. In the second stage, the disc stack separator will separate the liquid phase coming from three-phase decanter centrifuge into fat, water and solid components. Usually, the fat is clarified with a second disc stack separator.
3.4 Fish Products
The separation process of three-phase decanter centrifuge has been the standard and mature process for fish meal production, mainly used to extract fish meal and fish oil from whole fish or fish head, fins, bones and other wastes. During processing, raw materials need to be heated and decomposed to produce fish oil. The steamed raw materials will be screened to obtain solid residue and liquid phase, and the solid residue will be pressed and dried to obtain fish meal. Fish oil, fish juice and residual solid residue can be obtained from the liquid phase after being processed by a three-phase decanter centrifuge.
3.5 Clarification of Plant Oil
Plant oil is an important raw material in modern life, such as olive oil, palm oil, rapeseed oil, etc. Some of these oils can be eaten and used in the catering industry and food processing industry, and some are used in cosmetics processing. After the oil is extracted from the plant fruit by crushing, grinding, or pressing, the oil contains a certain amount of water and fruit residue. The three-phase decanter centrifuge is often used to separate the water and residue from the plant oil, making the oil more clear. If you want to obtain more clear oil, you can add a disc stack separator to further process the oil.
3.6 Starch Production
Wheat is one of the most important raw materials to produce starch and its by-products in the world. Starch production includes the decomposition of wheat flour into A starch, pentosan and gluten or B starch. The more effective method is three-phase decanter centrifuge, which separates the whole A starch into concentrate, removes gluten from B starch, and separates light components.
3 phase decanter centrifuge is one of the centrifugal separation equipment of SHENZHOU Company. As an original equipment manufacturer, SHENZHOU is committed to providing users with cost-effective, energy-saving and environment-friendly separation solutions. For more information about three-phase decanter centrifuges, please no hesitate to contact SHENZHOU Separation.
Technical Paramter of 3 phase decanter
|
Model |
Diameter |
Length |
Max Speed
(R/Min) |
L/D Ratio |
G-Force
(G) |
Capacity |
Main Motor Power |
Weight |
Dimension
(L*W*H) |
|
(Mm) |
(Mm) |
(M3/H) |
(Kw) |
(Kg) |
(Mm) |
|
LWS355*1160 |
355 |
1160 |
3600 |
3.3 |
2576 |
2-8 |
15 |
1400 |
2470*1350*830 |
|
LWS355*1460 |
355 |
1460 |
3600 |
4 |
2576 |
2-10 |
15 |
1800 |
2750*1350*830 |
|
LWS450*1800 |
450 |
1800 |
2800 |
4 |
1976 |
4-25 |
37 |
2500 |
3320*1700*1130 |
|
LWS500*2000 |
500 |
2000 |
2500 |
4 |
1750 |
5-35 |
45 |
4000 |
3520*1800*1170 |
|
LWS520*2080 |
520 |
2080 |
3200 |
4 |
3154 |
3-35 |
55 |
5000 |
4510*1410*1170 |
|
LWS550*2000 |
550 |
2000 |
2800 |
4 |
2414 |
6-40 |
55 |
5700 |
4570*1380*1600 |
|
LWS650*1950 |
650 |
1950 |
2200 |
3 |
1761 |
6-45 |
75 |
5000 |
4840*1510*1720 |
|
LWS650*2600 |
650 |
2600 |
2000 |
4 |
1456 |
6-65 |
90 |
6000 |
5490-1510*1720 |
Customers from other countries visited Shenzhou Group :
Audited Supplier 
){kind=link}
){kind=link}