ATMOS Premium Tissue I Energy efficiency – A challenge for ... - Voith

TECHNOLOGY
14
Conversion package: C-bar screen basket/MultiFoil
rotor with belt pulley for speed adjustment (patented)
screened, to prevent plugging of the
screen basket surface.
By increasing capacity, this measure
either saves about 20% of specific
energy costs or improves screening
quality with otherwise unchanged
parameters.
Throughput capacity increased
by 20%, and bottleneck eliminated
Problem 3: Increase in paper machine
production cause higher rejects rates
in the approach flow screens,
and overloading of the last screening
stage.
Solution: Increase screen throughput
capacity by fitting the screen with
a MultiFoil rotor and a C-bar basket.
Example (for a customer in Germany):
Rebuilding Omega screens with
MultiFoil rotors and C-bar baskets
increased throughput of the final
screening stage by 20% with the
same slot width.
By ensuring depend able operation of
the first screening stage, this rebuild
enabled a 30% production increase
of the paper machine.
A complete success right down
the line
Problem 4: A customer in Thailand
wanted to optimize the approach flow
screen for greater throughput capacity,
and the customer also required
better paper quality.
High-Toothed disperger fillings compared with milled-tooth ring fillings
Solution: Rebuilding the Black Clawson
screens by fitting MultiFoil rotors
with speed modification, and using
C-bar technology with slot width
reduction from 0.45 to 0.30 mm,
enabled:
● 47% less power consumption
● stickies separation efficiency
improvement from 25% to 63%
● overall stock loss reduction from
0.4% to 0.1%
● 20% higher maximum throughput.
High-toothed disperger fillings
save up to 20% energy and
improve stock quality
High-toothed disperger fillings save
up to 20% energy and improve stock
quality.
Numerous older dispergers have already
been converted to modern
high-toothed fillings. These comprise
the well-proven high-toothed cast
fillings that are also used in the latest
DX disperger series with direct
heating.
Upgrading with high-toothed fillings
instead of milled or cast fillings with
low-profile teeth has always brought
improvements, whatever the application,
resulting in energy savings up
to 20%.
Furthermore, of all technological advances,
our customers have benefited
most from those that address
product cleanliness. In several cases
this also had a positive effect on
paper machine operation.
Voith dispergers with modern hightoothed
fillings technology have
proved themselves in practice with
maximum customer benefit. In teamwork
with our engineers and specialized
service technicians, Voith can
tailor disperger fillings to the specific
needs and circumstances of every
customer.
24 I 2007 I Voith Paper I twogether