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 • smaller particle sizes particle (biomass) size – 1.5 microns biomass percentage – 0.6% total solid percentage - 5.54% process!
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
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.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.