It reduces drying time by achieving the lowest residual moisture, and is ideal for raw and modified starches such as corn, wheat, potato, rice, tapioca, etc. It reduces the water content more than any other type of centrifuge.
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Production Cycle and Design Advantages
Overview
The next few slides will walk through the entire Production Cycle, showing the main pipe feeding and secondary pipe feeding, loading, centrifugation, discharge, back wash, heel cake removal, the washing machine effect, and cleaning with the spray balls. This slide shows all 9 at one time before we zoon in to each. After that, there will also be slides detailing additional components.
Main Pipe Feeding Phase
The suspension is fed by two feed pipes – main (1) and secondary pipes (2) – into the centrifuge. Under the influence of centrifugal force, it moves towards the filter cloth, placed on the basket. The solid part of the suspension is retained by the filter cloth forming a cake, while the liquid filters through the cake, the filter cloth and the holes of the back of the basket in the siphon chamber annular ring. The liquid is removed via siphon installed at the rear side of the basket.
Secondary Pipe Feeding Phase
The use of the secondary feed pipe (2) allows a formation of a pond at the front side of the basket and a skimmer, which can be submerged into the pond, can remove the proteins or the fine fibres, which float on the pond surface, as they are lighter than the water.
Loading
The suspension is fed by two feed pipes (main and secondary pipes) into the centrifuge. It moves towards the filter cloth under the action of centrifugal force, and onto the basket. The solid part of the suspension is retained by the filter cloth, forming a cake, while the liquid filters through the cake, the filter cloth, and the basket holes to the syphon chamber annular ring. The liquid is removed via a syphon installed at the rear side of the basket.
The use of the secondary feed pipe allows for the formation of a pool at the front side of the basket and the skimmer. The skimmer can be submerged into the pond and can remove the proteins or the fibers, which float over the pool surface, as they are lighter than the water.
After a pre-determined number of cycles, a cleaning phase of the knife is activated with high-pressure nozzles, without interrupting the production cycle.
Centrifugation
Once the washing phase is complete, the centrifuge accelerates to the maximum speed allowable for the product being processed, and maintains that speed for a given amount of time to achieve the desired level of residual moisture in the product. At the end of the centrifugation, the centrifuge decelerates to the discharge speed.
Discharge
After reaching the discharge speed, the knife increment command is activated. The scraping knife starts cutting the cake, moving the product into the screw conveyor and then into the dryer.
Back Wash
After a number of cycles, the heel cake can become less and less permeable. The regenerative back wash system resuspends the cake so that it is filterable again. This process makes it unnecessary to remove the product several times over the course of many cycles. Heal cake removal once a day is typical.
Heel Cake Removal
After a certain number of back washes, the heel cake that remains on the filter cloth can be removed to improve the filterability of the product by a large water flow through the main feed pipe. The removed product is collected by the knife, positioned close to the filter cloth, and moved through the screw conveyor into the solids recovery systems.
Washing Machine Effect
The centrifuge should be cleaned at every change of product to avoid cross contamination between campaign productions. The fully automated centrifuge cleaning system is composed of 2 main stages: Washing Machine Effect and cleaning with spray balls, which can be alternated to achieve maximum cleaning and to optimize the consumption of the cleaning liquid.
The centrifuge is filled with the washing liquid up to a predetermined height and is put in rotation. During the automatic washing sequence, the basket rotates both clockwise and counterclockwise. The knife goes in and out so that the washing liquid reaches all points of the process area, including the discharge chute.
Cleaning with Spray Balls
The washing liquid is sprayed through spray balls on all the surfaces of the process area to completely remove any residue of product still present.
Principal Components
- Automatic clamping ring (only for HX/L/S 1850/1300 and 2000/1400)
- Knife
- Feed pipe
- Screw conveyor
- Solid discharge chute
- Motor
- Basket inspection door
- Light glass
- Sight glass
- Liquid discharge outlet
Principal Components
- Knife
- Screw conveyor
- Skimmer
- Main feed pipe
- Secondary feed pipe
- Basket
- Corn
- Wheat
- Potato
- Rice
- Tapioca
- Rotary Siphon creates a vacuum, which accelerates the filtration rate
- Front skimming pipe allows for the efficient removal of proteins or fine fibers
- Lower residual moisture
- Heel regeneration with backwash
- Cake peeling at full rotational speed
- Laser cake detector
- The cycle can be run at maximum speed, obtaining a high hourly production
- Horizontal basket ensures uniform loading of cake
- Visual access to the process area from the front door and inspection ports
- No contact between the operator and product during operation
- Installation on concrete or carbon steel inertia base with anti-vibration dampers
- FDA-approved oil lubrication for bearings on all models
- Sizes range from 1250mm (49.2 in.) diameter to 2000mm (78.7 in.) diameter – See chart below
- Knife scraper blade fixed without use of bolts (FOD compliant)
- Suitable for the maximum recovery of solids discharged and the protection of the discharge chute
- Steep solids discharge chute (30° from vertical)
- Heel removal assist with optional blow back
- Options for solids discharge with high containment (use of continuous liner, isolator, etc.)
- Maintenance of shaft and bearings from the rear side of the machine (service area) without contaminating the clean room
- Fully automatic operation
- Complete PLC controls with touch-screen interface
- Switch between automatic, semi-automatic, and manual operation
- Variable frequency drive (VRD) speed control
- Highly effective C.I.P. system (Clean-in-Place) uses a Washing Machine Effect cycle and spray balls
- Automatic sanification of the filter cloth
- Automatic C.I.P of the knife to prevent product blockage
- Easily replaceable endless filter cloth, thermo-welded, in polypropylene or PTFE of various weaves and sizes
- Filter medium is easily changed and secured in the basket
- Automatic clamping ring for quick front door opening
- Design ensures low vibrations and noise level
- Construction materials
- Parts in contact with the product: all stainless steels and special alloys are available, such as AISI 316L, AISI 904L, hastelloy, monel, alloy 59, 254 SMO, nickel, titanium, SAF 2205.
- Surface coating option: Halar (ECTFE)
- Elastomers: antistatic and FDA certified, Teflon ETFE, and hard rubber
- Field service and technical support available
- Mechanical and electrical parts
- Process control and maintenance manuals
- Certifications and construction documentation
- Mechanical and electrical upgrades
Standard Sizes and Technical Data
| HX/L/SUnit |
Basket Diameter (mm) |
Filtering Surface (m2) |
Cake Volume (liter) |
Max Load (kg) |
Max Speed (RPM) |
G Factor (xg) |
Weight With no Motor (kg) |
With Inertia Base & Motor (kg) |
Centrifuge Weight (kg) |
|---|---|---|---|---|---|---|---|---|---|
| 1250/650 | 1250 | 2.55 | 346 | 484 | 1300 | 1180 | 6500 | 16000 | 1400 |
| 1250/800 | 1250 | 3.14 | 426 | 596 | 1300 | 1180 | 8000 | 20000 | 3000 |
| 1300/850 | 1300 | 3.47 | 500 | 700 | 1250 | 1135 | 8500 | 21000 | 4000 |
| 1700/920 | 1700 | 4.91 | 922 | 1290 | 1030 | 1000 | 14000 | 35500 | 4600 |
| 1700/1150 | 1700 | 6.14 | 1152 | 1614 | 1030 | 1000 | 15500 | 42000 | 8500 |
| 1850/1300 | 1850 | 7.55 | 1520 | 2130 | 985 | 1003 | 26000 | 58000 | 8700 |
| 2000/1440 | 2010 | 9 | 2023 | 2832 | 950 | 1000 | 32500 | 70000 | 9400 |
| 2100/1550 | 2100 | 10.2 | 2328 | 3260 | 900 | 950 | 33500 | 73000 | 1400 |
Pilot centrifuges – HX / GMP MODEL
Pilot centrifuges are used for both research and development laboratories, as well as small productions of high-added value products
Main Features
- Manual and automatic operations
- Skid mounted
- cGMP Design
- The process area is fully inspectable