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VHE Final heater for deodorization and physical refining of fats and oils0 pages
Application
This high-performance heat exchanger is specially designed
for the final heating of edible fats and oils in deodorization
and physical refining plants. This heating takes place under
vacuum and sparging steam conditions, using high-pressure
steam or another heating medium.
The VHE Final Heater is part of the Alfa Laval SoftColumn™
deodorization concept, but is also available as a retrofit
component for installation in other deodorization systems
– irrespective of origin.
Operating principles
The cold oil enters the VHE Final Heater at one end of the
shell side, which is under vacuum, and flows continuously
through a special baffle system until it reaches the outlet
connection at the other end. It then flows to the deodorizer
by gravity.
A fixed overflow pipe on the outlet connection controls the oil
level on the shell side.
The heating medium circulates under pressure through a set
of heating tubes installed inside the heat exchanger. The
sparge steam is injected through perforated tubes located on
the bottom of the shell, below the heating tubes.
Counter-current flow between the oil and heating medium is
maintained by a special design of the heating tubes and baffles
on the shell side. To empty the shell side, a drain valve is
installed on the bottom.
Design features
The VHE Final Heater is designed to heat oil under vacuum
and sparge steam conditions. Gradual heating under such
conditions avoids any overheating of the oil on the hot tube
surface and means that the oil is treated gently, thus maintaining
the quality. The sparge steam also acts as stripping to
remove volatiles and to improve the heat transfer rate.
The low liquid level ensures that the oil follows the desired
path, and thus remains inside the VHE Final Heater for the
required time, avoiding bypass. The first oil entering the
The VHE Final Heater
For deodorization and physical refining of fats and oils
VHE Final Heater
