Minimization of Wet End disturbances during web breaks using online LAV estimation

Nobakhti, A ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1016/j.conengprac.2010.01.003
  3. Abstract:
  4. During a Wet End break, the loss of paper feed through the paper machine causes loss of sensory information and the remaining parts of the process are operated in open-loop. This causes the stock composition in the Headbox to deviate substantially from the nominal specifications, causing paper quality (after start up) and paper machine runability issues. In this work, the Base Sheet Ash measurement of the scanner is estimated using a least absolute value (LAV) model which can then be used for control of the chalk valve during the breaks to keep the Headbox Ash within specified limits. The model is computed using a very fast optimization algorithm which is able to compute the LAV solution using only basic elementary operations. The proposed approach has been developed for a UK paper mill
  5. Keywords:
  6. Genetic algorithms ; Paper industry ; ASH measurement ; Base sheet ; Elementary operations ; Estimation algorithm ; Estimation algorithms ; Headbox ; Least absolute value ; Linear estimation ; Open loops ; Optimization algorithms ; Paper feeds ; Paper industries ; Paper machine ; Paper mill ; Paper quality ; Sensory information ; Start-ups ; Stock composition ; Web breaks ; Wet-end ; Algorithms ; Headboxes ; Paper and pulp industry ; Paper and pulp mills ; Paper products ; Papermaking ; Wet ends (papermaking machinery) ; Estimation
  7. Source: Control Engineering Practice ; Volume 18, Issue 4 , 2010 , Pages 433-447 ; 09670661 (ISSN)
  8. URL: http://www.sciencedirect.com/science/article/pii/S0967066110000043