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disk stack centrifuge. presented by. daniel, emily, etienne. the outline. of our presentation. purpose of centrifugation types of centrifuges properties disk stack centrifugation how it works equipment parts design considerations our design cost estimation questions and answers.

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disk stack centrifuge

disk stack centrifuge

presented by

daniel, emily, etienne

the outline
the outline

of our presentation

  • purpose of centrifugation
  • types of centrifuges
  • properties disk stack centrifugation
  • how it works
  • equipment parts
  • design considerations
  • our design
  • cost estimation
  • questions and answers
meeting the challenge
meeting the challenge

purpose of the centrifugation

a key role in many industrial processes, including the production of insulin, is to separate liquid phases and solids from each other

centrifugation can be utilized to separate the cellular debris from the released protein

many fish in the sea
many fish in the sea

types of centrifuges

decanter centrifuge

disk stack centrifuge

one of a kind
one of a kind

properties of the disk stack centrifugation

ideal for a wide range of separation tasks that involve

  • lower solids concentrations
  • smaller particle sizes

particle (biomass) size – 1.5 microns

biomass percentage – 0.6%

total solid percentage - 5.54%

process!

working principles
working principles

how a disk stack centrifuge works

  • separates solids and liquid phases in a continuous process
  • uses extremely high centrifugal forces
  • denser solids are forced outwards against the solid bowl wall
  • less dense liquid phases form concentric inner layers
  • inserting special plates provides additional surface settling area
working principles7
working principles

how a disk stack centrifuge works

the whole is the sum of parts
the whole is the sum of parts

parts of the disk stack centrifuge

  • inlet zone
  • reduces shear forces and amount of foaming
  • increases and avoids disturbances of the separation processes occurring in the bowl
  • liquid discharge section
  • 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
  • solids discharge section
  • remove solids by continuous solids discharge, intermittent solids discharge or manual removal
the whole is the sum of parts9
the whole is the sum of parts

parts of the disk stack centrifuge

  • 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
keys to exceptional performance

design considerations

  • efficiency depends on
    • solids volume fraction
    • sedimentation area
    • rotational speed
  • efficiency can be improved if
    • particle diameter is increased (coagulation, flocculation)
    • residence time
    • distance for sedimentation
keys to exceptional performance11
keys to exceptional performance

design considerations

  • desirables
  • high centrifuge speed
  • large particle size
  • large density difference
  • between solids and liquids
  • large radius
  • small viscosity
our very own
our very own

our design

solid wall

continuous liquids discharge

batch manual solids discharge

time for shopping
time for shopping

cost estimations

unit cost

$166 000 CAD

installation cost

$40 000 CAD

disk stack centrifuge technology

meticulous control, low cost and high reliability

he said she said
he said, she said

references

pictures

http://www.flottweg.com/Broschu/%DCbersichtsprospekt_E.pdf

http://www.alfalaval.com/digitalassets/2/file30910_0_DiscStackBrochure.pdf

websites

http://web.mit.edu/tox/sasisekharan/downloads/BIOT53.pdf

http://www.sls.hw.ac.uk/icbd/Newsletter/Newsletter_Winter_2005.htm

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.., Nelson K.L. Bioprocess engineering : systems, equipment and facilities. New York : Wiley, 1994.

Perry, R.H.; Green, D.W. (1997). Perry's Chemical Engineers' Handbook (7th Edition). McGraw-Hill.