disk stack centrifuge presented by daniel, emily, etienne

the outline purpose of centrifugation types of centrifuges 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 As centrifugation can be utilized to separate the cellular debris from the released protein

many fish in the sea decanter centrifuge disk stack centrifuge types of centrifuges decanter centrifuge As disk stack centrifuge

one of a kind ideal for a wide range of separation tasks that involve properties of the disk stack centrifugation ideal for a wide range of separation tasks that involve lower solids concentrations smaller particle sizes 1.5 microns = 1.5 x 10-6 m 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 from each other in a single continuous process The area where these two different liquid phases meet is called the interface position. This can be easily varied in order to ensure that the separation takes place with maximum efficiency Inserting special plates – disk stack – provides additional surface settling area and contributes to speeding up the separation process dramatically. It is the particular configuration, shape and design of these plates that make it possible for a disc stack centrifuge to undertake the continuous separation of a wide range of different solids from either one or two liquids. 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 As

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 Very good inlet zone design prevents all foaming Once separated, the liquid must often be conveyed out of the centrifuge as delicately as possible. In some applications, it is important that oxygen pick-up is kept to a minimum, and that temperature increases + continuous solids discharge: solids and liquid exit via nozzles in the periphery + intermittent solids discharge: a carefully designed system opens ports in the bowl periphery at controlled intervals in order to remove the collected solids + manual removal, in which the machine is stopped and the bowl is opened so that the collected solids can be removed manually 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 Disk stack area is the heart of the centrifuge and the design of the disc is therefore crucial The layout and design of the distribution holes also have a crucial influence on good 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 (coagulation or flocculation of particles) Coagulation = removal of electrostatic charges Flocculation = addition of charges to bridge oppositely-charged particles

keys to exceptional performance design considerations desirables high centrifuge speed large particle size large density difference between solids and liquids large radius small viscosity (coagulation or flocculation of particles) Coagulation = removal of electrostatic charges Flocculation = addition of charges to bridge oppositely-charged particles

our very own solid wall continuous liquids discharge our design solid wall continuous 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 As

time for shopping unit cost $166 000 CAD installation cost $40 000 CAD cost estimations unit cost $166 000 CAD installation cost $40 000 CAD As 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. As

thank you! questions?