What is purifier and clarifier?
Centrifuges
can be either purifiers or clarifiers
The clarifier is a centrifuge, which is arranged to separate finer solid impurities from the
oil, there is no gravity disc or water seal
A purifier is a centrifuge, which is arranged to separate water and solid impurities from
oil, in this there have gravity disc and water to separate the liquid of different densities. An Oil Purifier Separates
Various Contaminants (Aluminum, Silicon, Sludge, Water, Etc.) From Oil In Such
Specific Condition To Maintain Oil Characteristics To Certain Limits.
Compare purifier and clarifier?
PURIFIER
When a
centrifuge is set up as a purifier, a second outlet pipe is used for
discharging water as shown. In the fuel oil purifier, the untreated fuel
contains a mixture of oil, solids, and water, which the centrifuge separates
into three layers. While in operation, a quantity of oil remains in the bowl to
form a complete seal around the underside of the top disc and, because of the
density difference, confines the oil within the outside diameter of the top
disc. As marine fuel oil normally contains a small quantity of water, it is
necessary to prime the bowl each time that it is run, otherwise, all the oil
will pass over the water outlet side to waste. The water outlet is a greater
radius than that of the fuel. Within the water outlet, there is a gravity disc,
which controls the radial position of the fuel water interface
A set of
gravity discs is supplied with each machine and the optimum size to be fitted
depends on the density of the untreated oil. When the fuel centrifuge is
operating, particulate matter will accumulate on the walls of the bowl. If the
centrifuge is set as a clarifier, the particulate matter will be a combination
of water and solid material. If it is set as a purifier, the free water is
continuously discharged, therefore, the particulate matter will consist of
solid material. In older machines, it is necessary to stop the centrifuge to
manually clean the bowl and disc stack, however, the majority of machines today
can discharge the bowl contents while the centrifuge is running.
Main Difference
- Remove water and suspended solids particles from oils
- Two outlets for water and clean oil
- Gravity disc on top
- Blind disc on the top of the disc stack
- Sealing water required
CLARIFIER
The
addition of an inlet and an outlet connection forms a simple clarifier.
Rotational speeds vary according to designs and are of the order of 7,000 to
9,000 rpm. Efficiency is increased by the inclusion of a number of discs (up to
150) that increase the surface area and thus help separation. Discs are
separated at a distance of 0.5-0.6 mm. After passing down the central passage,
the untreated oil is carried by centrifugal forces towards the periphery of the
bowl and then passes up through the disc stack. Here is where the actual
separation takes place, in the channel formed between two discs. Two forces act
on each solid or liquid particle. The particle is pushed upwards with the oil
stream towards the center while the centrifugal force directs it to the
periphery. The residual force on denser particles (impurities) will drive them
towards the periphery, while the less dense particles (oil) will be directed
towards the center of the bowl and raise to the outlet connection.
Main Difference
- Remove finer and lighter particles from the oil
- One outlet for clean oil
- No gravity disc only sealing ring
- Blind disc at the bottom.
- Sealing water is not required