Centrifuging_distription of working principle.ppt

regarding operation of centrifugal seperators

1. 1 April 2008 CINEC MARITIME CAMPUSCENTRIFUGINGCENTRIFUGING
J.L.A.C.MOTHAJ.L.A.C.MOTHA
ALCAP Purifiers
GAMINI KURUPPU

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Basic Theory
Settling of dirt particles will depend upon:-
Distance
Viscosity
Size of particle
Gravitational Force
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Diagram
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Rate of sedimentation
When a particle (solid or liquid) moves through a viscous
medium under the influence of gravitation, it will attain a
constant velocity after a certain time.
This is known as the sedimentation velocity
or derived from Stokes' Law, the rate of sedimentation
can be calculated if the following physical parameters
are known:
•Particle diameter d (m)
•Particle density Pp (kg/m3)
•Density of the continuous phase PI(kg/m3)
•Viscosity of the continuous phase 1'/(kg/m,s)
•Gravitational acceleration g (9.81 m/s2)
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Simple Centrifuge
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Limit Size Particle
The smallest particle that can be captured
in the purifier.
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Limit Size Particle Depends On:
Bowl R.P.M.
Flow rate
Distance between discs
Viscosity
Temperature
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INTERFACE POSITION
INFLUENCED BY
Temperature/Viscosity
Gravity Disc
Back Pressure
Density of Fuel
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LIMITATION OF PURIFIER
Changing of Gravity Discs
Unable to clean high density fuels
Unable to cope with changing densities
( Like when topping up settling tanks)
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ALCAP SEPARATION SYSTEM
Main features of the ALCAP separation system are
The separator is operated similar to a clarifier.
When there is water it collects in the periphery.
Interface moves inwards
Water goes out with cleaned oil
A water transducer monitors the water content in the
cleaned oil.
If water content increases to a pre determined value
A transducer detects the water content
Bowl desludges and discharges water.and sludge.
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Al Cap purifier discharge line water sensor

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Purifiers

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Purifier Starter Panel

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L.O.Back Flush Filter

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L.O.Back Flush Filters

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