Evaluating and optimising dryer section performance

摘要

The paper machine dryer section consumes large amounts of steam energy. It also has a significant impact on both production and sheet quality. As a result, mill profitability can be heavily influenced by overall dryer performance. The drying process, like other papermaking operations, is a complex matrix of interacting components: Pocket ventilation, steam distribution and handling, drive system, tail threading, sheet handling, energy-recovery, and fabric conditioning, guiding, and tensioning. An evaluation of the dryer section begins with identifying the performance criteria and standards of good dryer section operation. Once defined, a complete set of dryer section measurements, including an analysis of equipment sizing, is performed to assess performance against the defined standards. Recommendations are provided for operational improvements, equipment upgrades, and a checklist of short-term and long-term improvement projects prioritised by the expected economic return. Typical returns come from energy savings, increased drying capacity, reliable dryer drainage, improved dryer section runnability, and enhanced drying uniformity, among other improvements. A comprehensive dryer performance evaluation report identifies improvement opportunities and quantifies the associated benefits. This paper discusses the benchmarks commonly used when evaluating dryer section performance. Common opportunities for steam efficiency improvements are identified.