Energy Reductions in the Pulp-and-Paper Industry by Upgrading Conventional Pumping Systems through the Installation of VFDs – A Case Study
Energy Reductions in the Pulp-and-Paper Industry by Upgrading Conventional Pumping Systems through the Installation of VFDs – A Case Study, Proc International Conf. on Renewable Energies and Power Quality - ICREPQ, Santiago de Compostela, Spain, Vol. 1, pp. 1 - 1, March, 2012.
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In this paper we intend to demonstrate the benefits
that can be obtained by upgrading conventional pumping
systems, i.e, without speed control, pervasive in the older project
Pulp-and-Paper industries, through the installation of Variable
Frequency Drives (VFDs). The main objective is to significantly
reduce the energy consumption and associated cost, while
simultaneously avoiding the production of excess Greenhouse
Gases (GHGs), contributing to the global sustainability efforts.
A case study is presented, where a conventional level control
system, based on an automatic valve and a constant speed driven
pump, is converted to a control strategy based on the combined
actuation on the valve and on the speed of the pump. For this
study, it is shown that a yearly energy reduction of about 60% is
achieved. This reduction, associated with a 160 kW motor,
results in a yearly energy reduction of about 533 MWh and an
associated reduction of about 250 tonnes CO2. Negative effects in
the power quality such as harmonics and common-mode currents
must be considered, but could be kept under acceptable limits.
With the results presented in this work, fully developed in an
actual industrial environment, we aim to motivate those in the
industry to pursue similar objectives.