disk stack centrifuge daniel, emily, etienne presented by
TRANSCRIPT
disk stack centrifuge
daniel, emily, etiennepresented by
the outline
• purpose of centrifugation• types of centrifuges• properties disk stack centrifugation• how it works• equipment parts • design considerations • our design• cost estimation• questions and answers
of our presentation
meeting the challenge
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
purpose of the centrifugation
many fish in the seatypes of centrifuges
decanter centrifuge
disk stack centrifuge
one of a kindproperties of the disk stack centrifugation
ideal for a wide range of separation tasks that involve
particle (biomass) size – 1.5 microns biomass percentage – 0.6%total solid percentage - 5.54%pr
oces
s!
• lower solids concentrations
• smaller particle sizes
working principleshow 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 principleshow a disk stack centrifuge works
the whole is the sum of partsparts 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 partsparts 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 performancedesign 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 performancedesign considerations
desirables
• high centrifuge speed• large particle size• large density difference between solids and liquids• large radius• small viscosity
our very ownour design
solid wallcontinuous liquids discharge
batch manual solids discharge
throughput
density difference
liquids viscosity
sedimentation area
disk diameter
height
speed
G
motor power
number of disks
134.4 L/min
1.05
0.89 cP
35 m2
0.33 m
0.16 m
5 500 rpm
10 400
6 hp
120
time for shoppingcost estimations
disk stack centrifuge technologymeticulous control, low cost and high reliability
unit cost $166 000 CAD
installation cost $40 000 CAD
he said, she saidreferences
pictures
http://www.flottweg.com/Broschu/%DCbersichtsprospekt_E.pdfhttp://www.alfalaval.com/digitalassets/2/file30910_0_DiscStackBrochure.pdf
websites
http://web.mit.edu/tox/sasisekharan/downloads/BIOT53.pdfhttp://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?