Descripción: decanter centrifuge application and sizing
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centrifugeFull description
decanter centrifuge application and sizingDescrição completa
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laporan centrifuge
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Centrifuge A mechanical device that uses centrifugal or rotational forces to separate substances of different densities, such as solids from liquids or liquids from other liquids. Centrifugation is an operation which involves the use of the centrifugal force for the sedimentation of heterogeneous mixtures with a centrifuge, used in industry and in laboratory settings. This operation is used to separate two immiscible liquids.
Type Of centrifuges 1. Filtering centrifuges
2. Sedimentation centrifuges
centrifuges Batch Filtering centrifuges
Batch sedimentation Centrifuges
Vertical Basket Centrifuges
Imperforated Basket Centrifuges
Horizontal Peeler
Tubular Centrifuges
Inverting Bag Centrifuge
Continuous Sedimentation
centrifuges
Continuous Filtering Centrifuges
Screen Bowl Centrifuge
Scroll Screen centrifuge
Pusher Centrifuge
Vibratory Centrifuge
Decanter centrifuge
Solid Bowl or Decanting Centrifuges
Disc Centrifuges
Disk Stack centrifuge
Selection Criteria of Centrifuge
Current or past experience
Physical Properties of Materials
Specific Gravities of the Solids and Liquids
Particle Size
Performance Criteria
Solid Recovery
Solid Dryness
Centrate Clarity
Process requirements
Logistics
Pressure and Temperature
Flow Rate (solid loading)
Solid Concentration
Number Of components of Feed Degree Of Purity required
Properties of the disk stack centrifugation
Ideal for a wide range of separation tasks that involve •
lower solids concentrations
•
smaller particle sizes
How a disk stack centrifuge works
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separates solids and liquid phases in a continuous process
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uses extremely high centrifugal forces
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denser solids are forced outwards against the solid bowl wall
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less dense liquid phases form concentric inner layers
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inserting special plates provides additional surface settling area
Parts Of Centrifuge: 1. Inlet zone •
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reduces shear forces and amount of foaming increases and avoids disturbances of the separation processes occurring in the bowl
2. Liquid discharge section •
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important that oxygen pick-up is kept to a minimum temperature increases in the liquid must be avoided to prevent problems later in the process
3. Solids discharge section •
remove solids by continuous solids discharge, intermittent solids discharge or manual removal
4. Disk stack area •
•
•
heart of the centrifuge key to good separation performance lies in the efficiency of the disk stack layout and design of the distribution holes ensure that the process flow is evenly spread among all the disks
Keys to exceptional performance 1. Efficiency depends on •
solids volume fraction
•
sedimentation area
•
rotational speed
2. Efficiency can be improved if •
particle diameter is increased (coagulation, flocculation)
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residence time
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distance for sedimentation
3. Desirables •
high centrifuge speed
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large particle size
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large radius
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small viscosity
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large density difference between solids and liquids
Books Belter P.A., Cussler E.L., Hu W.S. Bioseparations : downstream processing for biotechnology . New York : Wiley, 1988. Lydersen B.K., D’Elia N.A.., Ne lson K.L. Bioprocess engineering : systems, equipment and facilities. New York : Wiley, 1994.
