Separators with tangential vapour inlet or Wrap-Around
Separators
SEPARATORS WITH TANGENTIAL VAPOUR INLET
As the vapours
generated from the evaporation are used as heating source in the
"following" calandria, any product must be separated, seeing how it would
otherwise contaminate the condensate and represent a loss.
The majority of the concentrate is discharged from the bottom of the
calandria below the tube bundle. Due to the high vapour velocity some of the
concentrate will be carried along with the vapour as small droplets. The
separation is done in a separator with tangential vapour inlet, see Fig. 17a,
connected to the calandria below the tube.
Fig. 17a Separator
with tangential inlet
Special care is taken to design the separator to avoid product carry-over at
lowest possible pressure drop, as a drop in the pressure is equal to drop in
heating enthalpy in the following calandria with an all-over drop in the
efficiency as a result.
WRAP-AROUND SEPARATOR
To reduce space requirements a new
development has taken place with the design of the Wrap-Around Separator, see
Fig. 17b. It is integrated into the base of the calandria. It has the same high
efficiency as the classical separator with a low pressure drop. It is typically
used on large calandrias with MVR compressors connected to the wrap-around
separator with a very short vapour duct minimizing the pressure drop. Space
requirements is typically reduced by 30%.
Fig. 17b Wrap-around
separator