Chemical Engineering February 2016 - 10

Oil-free compressed air at a fraction of the cost
T
he recently commercialized
high-speed turbo (HST)
compressors from BOGE
Kompressoren Otto Boge
GmbH & Co. KG (BOGE; Bielefield,
Germany; www.boge.de) produce
100% oil-free (Class 0) compressed
air at the highest degree of efficiency
and with minimal maintenance effort,
according to Matthias Eichler, head
of Branding and Marketing Services.
The HST compressors incorporate
a number of design features that
result in a " radical reduction " in the
number of components compared
to conventional compressors. As
a result, BOGE was able to reduce
the total costs, compared to oil-free
screw compressors, by up to 30%,
says Eichler.
The new compressors (diagram)
are driven by a permanent magnet
motor, which is characterized by a
very high energy density. Airfoil bearings
are used - for the first time
- in the drive shaft, which enables
operation at extremely high
speeds (up to 120,000
rpm). Titanium impellers,
located at the end of the
motor shaft, rotate at high
speeds and set the intake
air in motion. Thanks to the
geometrical design of the
impeller in conjunction with
the diffuser and the spiral
housing, the kinetic energy
is effectively converted to
pressure energy. A sophisticated
cooling concept
ensures effective cooling
of the air after each compression
stage, and integrated frequency inverters
allow the volume flowrate to
be infinitely adjusted to the demand
for compressed air.
Other features of the HST comChemstations
2016-IntroChemcad7-CemEng-Feb2016_FINAL.pdf 1 1/7/16 1:46 PM
pressor include the following: Only
one movable part per drive motor
is installed, as well as significantly
fewer bearings and seals. There is
no fan motor, gear unit, lubrication
Permanent
magnet motor
Spiral casing
Radial air
support
Axial air
support
Impeller
Intake funnel
system or oil pump. As a result, the
footprint of the HST compressors is
half that of alternative oil-free screw
compressors, and the weight is also
reduced by two thirds, says Eichler.
Three models will be available with
a standard pressure of 7.5 bars.
Boge began serial production of the
HST 55 (7.97 m3/min) in November
2015, and will follow later this year
with the HST 110 (17.97 m3/min)
and the HST 220 (36.57 m3/min).
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Chemical Engineering February 2016

Table of Contents for the Digital Edition of Chemical Engineering February 2016
