Paper Technology International 2024 - Journal - Page 147
PAPERTECHNOLOGYINTERNATIONAL
Figure 16: GLI special center 昀椀llet.
Process upgrade examples
MCE / MCEV retro昀椀ts and MCA / MCV hydro昀椀ts for process
upgrades
MCE / MCEV retro昀椀t and MCA / MCV hydro昀椀t for the same
high 3rd generation MCE performance have also been used for
capacity and process upgrades. The installation of an MCE retro昀椀t
(new exchange unit with ef昀椀cient Fluider™ impeller, casing cover,
bearing unit adapter, shaft seal and vacuum pump parts for internal
degassing in the MCEV models) in existing 昀椀rst-generation MC
pumps have made easy process upgrades possible.
The same improvement can be achieved through the
installation of an MCA / MCV hydro昀椀t (new MCE pump casing and
more ef昀椀cient Fluider™ impeller and O-rings and gaskets) in existing
second-generation MCA / MCV pumps.
These result in improved process economy and increased
production rate. The retro昀椀ts are possible with only minor
mechanical modi昀椀cations to the bare pump, often requiring no
piping or drive changes. References are available in many countries
including Brazil, Canada, Finland, France, Indonesia, Japan, Spain,
Sweden, South Africa, and the United States.
Customer case: VULCA increases pulp production and reduces
air
Feedback from a mill indicates that by using VULCA in
one line only, signi昀椀cant savings were achieved. For example,
the discharge time of the digesters has been reduced from 35-40
minutes to 25 minutes, while digester production has increased by
4%. At the same time, the amount of dilution liquor was reduced
from 100 m3 to 50 m3 for each blow, agitation power reduced from
330 kW to 165 kW, and the air content was lowered from 10-15% to
5-8%.
VULCA bene昀椀ts:
Saves pumping energy.
Boosts bottom zone mixing.
Prevents the mixing of air into the stock at low stock levels.
Figure 18: MCE retro昀椀t application in a bleaching line.
Figure 17: VULCA center 昀椀llet pillar.
MCE / MCEV retro昀椀t and MCA / MCV hydro昀椀t performance
improvements and bene昀椀ts
MCE / MCEV retro昀椀t and MCA / MCV hydro昀椀t performance
improvements offer many bene昀椀ts to the customer:
•
Higher production rates with the same existing basic
MC pumping system.
•
Cost savings because there is no need to change to a
bigger MC pump size.
•
Higher pump ef昀椀ciency and remarkable energy savings
are possible.
•
Higher pumping heads provide possibilities for process
upgrades, e.g. increased bleaching ef昀椀ciency with
higher pumping consistencies and higher reactor
pressures.
•
Remarkable chemical and steam savings when running
the MC equipment with higher consistency.
•
Lower operation costs because less dilution water is
needed.
•
Increased storage tower capacity with higher storage
consistency.
•
Possibility to eliminate belt or gear drive units that
require a lot of maintenance.
•
Extended lifetime of equipment and drive units is
possible.
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