Chemical Engineering September 2020 - 34
on degradation patterns over time.
Corrected model parameters of
recent operation are used to simulate
the performance of the pump
system. Instead of relying on theoretical
values, the system performance
is estimated based on the
latest measurements. Last but not
least, an optimization engine triggers
simulations, to identify the optimal
operating conditions satisfying the
user's requirements for overall system
performance.
Downstream calculations are also
leveraging the monitoring results.
Deviations from the pump's best efficiency
point (BEP) provide insights
to both performance losses and acQ
Inlet
1
I
Inlet
2
D
P
Pump
P
Outlet
4
N
Electrical
driver
Figure
4. This diagram shows a pump/electricaldriver
system with measurements for volumetric
flow (Q), pressure (P), suction, discharge, rotational
speed (N) and electrical current (I)
cumulated impact on the pump's
reliability. Finally, machine learning
algorithms are employed to identify
abnormalities in pump operation and
to notify the user in case of an imminent
failure.
From monitoring to analytics
Following a digital-twin monitoring
approach, a physical representation
of the system (in addition to the
sensor data) is required. Input shall
be provided concerning the system
topology, along with technical characteristics
of the individual assets
(that is, pumps, drivers, couplings,
pipes, valves, sensors and so on).
The combination of operational data
and system characteristics offers the
basis for pump-system monitoring.
In a traditional monitoring system,
every component is evaluated based
on nearby sensor measurements
and the overall performance of the
system by using a subset of the
local sensors. In the proposed approach,
local raw measurements are
combined with equipment topology
and modeling. This strategy enriches
the available sensor data, imposing
physical and numerical constraints to
the solution.
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In detail, a steady-state network
flow approach is followed to construct
the analyzed pumping system.
System equipment (pump, pipe,
valve, electrical driver and so on) are
represented as system nodes and
pre-defined physical equations describe
their behavior. The combination
of these nodes can represent
complex pumping configurations.
During the digital-twin configuration,
node combinations define the asset
topology. Furthermore, a number of
model parameters need to be speciChemiCal
engineering www.Chemengonline.Com September 2020
3
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Chemical Engineering September 2020
Table of Contents for the Digital Edition of Chemical Engineering September 2020
Contents
Chemical Engineering September 2020 - Cover1
Chemical Engineering September 2020 - Cover2
Chemical Engineering September 2020 - Contents
Chemical Engineering September 2020 - 2
Chemical Engineering September 2020 - 3
Chemical Engineering September 2020 - 4
Chemical Engineering September 2020 - 5
Chemical Engineering September 2020 - 6
Chemical Engineering September 2020 - 7
Chemical Engineering September 2020 - 8
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Chemical Engineering September 2020 - Cover3
Chemical Engineering September 2020 - Cover4
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