Disk Stack Centrifuge 2e6v40

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

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 types of centrifuges

decanter centrifuge

disk stack centrifuge

one of a kind properties of the disk stack centrifugation

ideal for a wide range of separation tasks that involve • lower solids concentrations

process!

• smaller particle sizes

particle (biomass) size – 1.5 microns biomass percentage – 0.6% total solid percentage - 5.54%

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 principles how a disk stack centrifuge works

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 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 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 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 design

solid wall continuous liquids discharge batch manual solids discharge throughput134.4 L/min density difference1.05 liquids viscosity0.89 sedimentation area35 m2 disk diameter0.33 m height0.16 m speed5 500 rpm G10 400 motor power6 hp number of disks120

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 references

pictures

http://www.flottweg.com/Broschu/%DCbersichtsprospekt_E.pdf http://www.alfalaval.com/digitalassets/2/file30910_0_DiscStackBrochure.pd f websites

http://web.mit.edu/tox/sasisekharan/s/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.

thank you! questions?