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Horizontal screw centrifuges and disc centrifuges are two common types of centrifugal separation equipment, which are widely used in industrial production and laboratories.
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Horizontal Cecanter Centrifuges Are Highly Efficient Centrifugal Separation Devices That Can Be Widely Applied In Fields Such As Chemical Engineering, Petroleum, Food, Pharmaceuticals, And Environmental Protection, Where Solid-liquid Separation Is Required. Horizontal Screw Centrifuges Can Generally Be Classified Into Horizontal Screw Filter Centrifuges And Horizontal Screw Discharge Sedimentation Centrifuges. In A Horizontal Screw Discharge Sedimentation Centrifuge, The Rotor And The Screw Rotate At A Certain Differential Speed In The Same Direction At High Speed. The Material Is Continuously Introduced Into The Screw Feeding Cylinder Through The Feed Pipe, Accelerated And Then Enters The Rotor. Under The Action Of The Centrifugal Force Field, The Heavier Solid Phase Deposits On The Rotor Wall To Form A Sediment Layer. The Relatively Clear Liquid Phase Forms An Inner Liquid Ring And Continuously Overflows From The Rotor Through The Overflow Port At The Large End Of The Rotor And Is Discharged From The Machine Through The Liquid Outlet. The Relative Motion Between The Screw And The Rotor Is Achieved By A Differential Gear. The Housing Of The Differential Gear Is Connected To The Rotor, The Output Shaft Is Connected To The Screw, And The Input Shaft Is Connected To The Auxiliary Motor. While The Main Motor Drives The Rotor To Rotate, It Also Drives The Rotation Of The Differential Gear Housing. Since The Input Shaft Is Connected To The Auxiliary Motor, The Auxiliary Motor Generates A Braking Torque, Which Drives The Planetary Gears To Rotate According To The Designed Transmission Relationship And Transmits The Torque To The Screw Blades In A Certain Proportion, Thus Achieving Continuous Separation In The Horizontal Screw Discharge Sedimentation Centrifuge.
A disc centrifuge is a device that separates suspensions by utilizing a centrifugal force field. Its main components include a drum, a disc stack, a drive unit, etc. During operation, the suspension is fed into the interior of the drum. Under the guidance of the disc stack and the effect of centrifugal force, solid particles are thrown towards the drum wall and deposited, while the liquid is discharged from the center of the drum. The disc centrifuge is characterized by good separation effect, large processing capacity, and high degree of automation. It is suitable for separating suspensions with a relatively low solid content.
Difference Between Decanter and Disc Centrifuge | Technical Comparison
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1.A decanter centrifuge's axis of rotation is horizontal, whereas a disc-stack centrifuge bowl rotates around a vertical axis.
2.Decanter centrifuges typically exert around 3,000 Gs compared to 8,000+ Gs generated by a disc-stack centrifuge.
3.Sludge handling capacity is much higher for a decanter centrifuge compared to a disc-stack centrifuge. A decanter centrifuge can handle up to 50% sludge, while a disc-stack centrifuge is limited to 8% sludge by volume.
4.With a higher G-force, a disc-stack centrifuge can separate particles down to a 0.5-micron level. A decanter centrifuge typically separates particles, which are 100 microns or larger.
Overview of Decanter and Disc Centrifuge Operation
sludge dewatering technologies
A decanter centrifuge is an industrial machine designed to separate solids from liquids continuously. This process is also known as de-watering or sludge thickening.
Accelerated sedimentation is the key to the operation of all centrifuges. A decanter centrifuge exerts a force up to 4,000 times that of gravity to affect this settling. High-speed rotation is the cause of this force multiplier effect. This differential centrifugation is a widely used physical phenomenon.
As shown in the image below, the rapid rotation of the bowl causes a high centrifugal force in a radially outward direction, i.e., away from the rotating axis of the bowl. This force causes the denser solid particles to move towards the bowl wall (outward) while displacing the liquid inward.
The auger (also known as screw, scroll, or conveyor) rotates within the bowl at a speed different than that of the bowl. A planetary gearbox attached to the decanter bowl rotates the auger.
The auger scrapes or pushes the collected solids towards the tapered end of the decanter. Here the solids are pushed up the 'beach' and exit the bowl through the solids' discharge ports.
The path of the solids along the 'beach' is against the centrifugal force, which is directed radially outwards. This force causes the liquid to separate from the solids causing dry solids to exit the bowl.
The separated liquid(s) create a 'pond' inside the accumulated solids layer around the bowl periphery. Liquid discharge ports located at the far end of the bowl allow the separated liquids to exit the bowl.
A detailed writeup on decanter centrifuges is on our blog Decanter Centrifuge details, including uses, benefits, capacities, price-range, etc.
Compared With Disc Centrifuges, Horizontal Decanter Centrifuges Have Obvious Advantages.
High processing efficiency:
Horizontal screw centrifuges have a high processing efficiency, especially when dealing with viscous or high-concentration materials, they perform exceptionally well.
Small footprint: Compared to other types of solid-liquid separation equipment, the horizontal screw centrifuge has a smaller footprint, which is an important advantage for factories with limited space.
Sealed operation: The horizontal screw centrifuge can operate under a sealed condition, which helps to reduce environmental pollution and improve the working environment.
High degree of automation: Many horizontal screw centrifuges are equipped with an automated control system, which enables the continuous automatic operation of processes such as feeding, separation, and discharging, thereby improving work efficiency and reducing the need for manual intervention.
Widely applicable: The horizontal screw centrifuge is not only suitable for sludge dewatering, but also can be widely used in various industries such as chemical engineering, light industry, pharmaceuticals, food, and environmental protection.
specifications and models
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1. We will provide one-year warrantee to make sure your machine runs consistently.We always keep certain inventory level of spare parts,which means the replacements can be shipped to you right away.
2. Consultant services for whole machine life,24 hours technical support by email and telephone.
3. Send technicians to the jobsite for guiding the installation and adjustment,training operators and finishing the check and accept together with you.
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