Diabon

Graphite plate heat exchanger for corrosive media involving a variety of acids and other organic and inorganic media

Applications
Heaters, coolers, interchangers, condensers and evaporators
for corrosive media, especially in the treatment of:
• Hydrochloric acid (HCl)
• Sulfuric acid (H2SO4)
• Hydroﬂuoric acid (HF)
• Mixed Acids (HNO3/HF)
• Phosphoric acid (H3PO4/P2O5)
• Other organic and inorganic media

Benefits

• Reliable operation with high resistance to corrosion
• Saving energy with a high thermal efficiency
• Great heat recovery with a close temperature approach
• Prolonged service intervals with reduced fouling
• Space saving compact units easy to install and service

Alfa Laval Diabon combines the highly efficient heat transfer ability of a compact plate heat exchanger with exceptional corrosion resistance in a graphite material. The Diabon™ range offers an ideal solution for duties where metallic, glass or Teflon® plates don’t match the requirements for a corrosion resistant, easy serviceable and thermally efficient heat exchanger.

The graphite plate heat exchanger consists of a pack of
corrugated graphite plates with portholes for the passage of
the two ﬂuids between which heat transfer will take place.
The plate pack is assembled between a carbon steel fxed
frame plate and movable pressure plate and compressed by
tightening bolts. The difference in coeffcients of expansion of
carbon steel and graphite is compensated for by means of
helical springs.
The plates are ftted with a flm type PTFE gasket of 0,2 mm
thickness after tightening, which seals the interplate channel
and directs the ﬂuids into alternate channels. The number
of plates is determined by the ﬂow rate, pressure drop and
temperature program. The plate corrugations promote ﬂuid
turbulence and minimize fouling.
The frame plate and pressure plates are suspended from an
upper carrying bar and located by a lower guiding bar, both of
which are fxed to a support column. Connections are located
in the frame plate or, if either or both ﬂuids make more than a
single pass within the unit, in the frame and pressure plates.
The frame and pressure plates are protected from the
corrosive media by means of a PTFE lining.