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Energy Audit Uncovers Major Energy Savings for Paper Mill
Abstract
The results from a recent Stora
Enso North America - Stevens Point
Paper Machine #34 (PM34) dryer
section rebuild will be reported. The
rebuild, funded partially by the
Wisconsin Focus on Energy program,
improved the effectiveness of the dryer
section. The mill used a four-step
approach and the energy efficiency
improvements were carefully
documented to demonstrate the
significant energy savings and
production improvements achieved
from each task. This paper tracks the
results from the dryer section feasibility
study through the installation of the
Dryer Management System control
software. The steps will be discussed as
follows:
1. Dryer Section Feasibility Study.
This report quantified the energy
savings and outlined a plan to
upgrade the dryer section.
2. Phase 1 of the Dryer Section
rebuild. Steam system
modifications and equipment
upgrades in the after section
were performed during the
scheduled eight-hour monthly
maintenance outages.
3. Phase 2 of the Dryer Section
rebuild. The installation was
continued in the pre-dryer
section during the scheduled
maintenance outages in the
months that followed.
4. Phase 3 of the Dryer Section
rebuild. The final stages of the
project were completed during a
5-day outage. This included the
installation of new valves,
transmitters and a complete
supervisory control system.
The paper will describe the
upgrade and tout the benefits of each
step. The energy use and production
history over a two-year time period will
be reported. The paper will describe any
problems encountered and solutions to
overcome them.
Observed benefits include
energy savings of 4,000 pounds per
hour steam and improvements in
machine runnability and sheet quality.
The expected energy benefits for paper
companies like the one in this case
study range from $100,000 to over $1
million per year. Machine production
increases of up to 20 percent are also
possible.
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Citation
Aue, J.; Pierce, S. (2005). Energy Audit Uncovers Major Energy Savings for Paper Mill. Energy Systems Laboratory (http://esl.tamu.edu); Texas A&M University (http://www.tamu.edu). Available electronically from https : / /hdl .handle .net /1969 .1 /5582.