Paper Technology International 2024 - Journal - Page 113
PAPERTECHNOLOGYINTERNATIONAL
Figure 3: Schematic process diagram of
retention aid control with BTG’s optical
consistency transmitter RET-2512
The dosage of the retention aid is controlled with the information
of the white-water consistency measured online with, for instance,
BTG’s low consistency optical transmitters. The aims are to stabilize
the wet-end which is very sensitive for the machine runnability and
to reach constant 昀椀nal paper or tissue quality.
Wastewater treatment
For producers who want to leave nothing to chance,
consistency measurement is the ultimate value for monitoring the
昀椀ber content at the inlet of the wastewater treatment plant. The
consistency signal can be then used to steer ef昀氀uents in storage
locations so that the treatment plant does not get overloaded.
Polymer dosage before decanter, 昀氀otation cell or screw press can
be also adjusted depending on the consistency. The water treatment
plant runs more serenely and there is no bad surprise at the outlet.
By reviewing all these consistency applications and their
related in昀氀uences on the production steps, we can also realize that
by getting an overview of the entire pulp, paper and tissue process,
there is room for more ef昀椀cient solutions of control and optimization.
More recent solutions
The latest developments in IT infrastructures and
software associated with large amount of process data collected
and available in real time led to advanced solutions of process
optimization. Thanks to solutions like VOITH’s OnView.
MassBalance, 昀椀ber streams can be visualized and optimized to
save raw materials. Model predictive control like BTG’s MACSsuite
enables additional pro昀椀t by anticipating process variations and by
managing multiple variables. All these optimizations are possible
only when the foundations of the control system are strong. It
means reliable online process measurements, including consistency
measurements.
Nowadays more data from consistency control loops can
be monitored and analyzed as well, like internal transmitter raw
signals, dilution valve opening, PID controller data. Software-based
solutions like BTG’s CONTROLsuite take advantage of available
data to determine how healthy are the control loops and to give
immediate recommendations for optimization when required.
The consistency transmitter itself is able to provide self-diagnosis
valuable information to anticipate any adjustment of parameters or
maintenance that may be required.
Furthermore, centralizing all data from consistency control
loops of a production line will improve consistency and dilution
control management as an overview of the entire process in three
levels: visualization with dedicated process diagram, harmonization
of best practices on all consistency control loops, optimization of the
dilution network. These innovations are part of solutions for never
ending demand to maximize pulp and paper process performances.
BTG is offering solutions for SMARTmonitoring, which permits to
have all information available in the cloud and accessible anytime
from anywhere.
Conclusion
Consistency is one of the key parameters for stability of
pulp and paper processes. From the outlet of digester to the wetend by way of stock preparation, controlled consistency leads to
optimum machine operations and subsequent highest productivity.
Further savings can even be generated thanks to development and
application of digital solutions in the frame of an industry becoming
increasingly smarter and complex.
Fortunately, pulp, paper, and tissue makers can rely on a
one-hundred-year experienced partner to deal with such important
consistency subject.
Figure 4:BTG SMARTmonitoring concept
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