Falling film provides the most effective use of heating surface,
and the AXERO™ double embossed heating element is the most
efficient surface in use today.
AXERO™ heating elements are spaced within the evaporator vessel so
that generated process vapors do not disturb the falling liquid
film. To ensure film continuity and integrity, the liquid is
redistributed as it flows down the surface by the staggered pitch
of the plate's dimples.
Produced vapors are released upon generation between the adjacent
elements. The available vapor space in both the vessel and between
elements is sized to minimize and avoid entrainment of the
circulating liquor. The highest vapor velocity for the system is at
the entrance to the entrainment separator assembly.
|STEAM SIDE COEFFICIENT:
The small pressure drop over each element assures uniform steam
distribution within that element. This makes the evaporator less
sensitive to the presence of non-condensable gases for they are
removed from the system more effectively.
|SCALING AND CLEANING:
Deposits form as a result of the evaporation process on the
external surface of elements. Since the external surface of the
AXERO™ elements is irregular and convex, the deposits have a lower
tendency to adhere, tend to spill off and can be more easily
removed via chemical or mechanical cleaning. All external surfaces
are more accessible for inspection and cleaning than a typical
Design of the AXERO™ element allows for countercurrent flow of the
incoming steam and the produced condensates. As a result the
elements act as an enrichment column for volatile organics. AXERO™
elements can effectively concentrate 80% of the incoming methanol
and BOD content into a five percent foul condensate product