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Function • Funcionamiento • Functionnement • Funcionamento
1
F
6
B
D
E
2
6
A
4
3
C
DRYPOINT DM 25-57 C..P2, 25-57 C..P3, 25-57 C..P4, 25-57 C..P5
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Membrane dryer layout
A : Head "Inlet"
B : Housing
C : Head "Outlet"
D : Membrane element with core tube
E : Nozzle
F : Blanking plug
Function
(1) Moist compressed air enters and is
distributed to the modules via the heads
F
(A). The air flows through the mem-
branes of the inner membrane element
(D) because the core tube is closed by a
blanking plug (F).
(2) At the end of the membrane element
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a partial flow of compressed air is con-
tinuously diverted and atmospherically
expanded through a nozzle (E).
Due to the expansion, the diverted air –
B
referred to as purge air – becomes much
drier because the moisture contained in
the compressed air is now distributed
over a much greater volume.
D
(3) This extremely dry purge air is chan-
nelled through the membrane element
(D) along the outside of the membranes.
Due to the ordered structure of the
membranes, the purge air is very evenly
distributed.
E
(4) Consequently, two flows of air with
different humidity levels move in a
countercurrent direction through the
membrane element, separated only by
the membrane wall:
inside the moist compressed air, outside
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the dry purge air. As a result of the humid-
ity difference, moisture diffuses from the
compressed air into the purge air.
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(5) Dry compressed air flows out of the
DRYPOINT M membrane dryer.
(6) Moist purge air is discharged into the
environment.
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