Process control and automation
- Introduction to process control and automation
- Development of process automation
- Fibre process automation
- Chemical recovery as a control object
- Advances in paper machine automation
- Paper machine as a dynamical system
- Tasks in paper machine control and management
- Control of stock flow concentration and quality
- Machine direction control
- Cross-directional control – The static optimisation
- Cross-directional control – Dynamics
- Cross-directional control – further aspects
- Controlling functional paper properties
- Managing grade chances in the paper machine
- Managing disturbances caused by broke and recovered solids
- Millwide systems
- Modelling and control methods
Basic control functions in batch digesters The details of the basic controls in batch digesters are strongly case-dependent: number of production lines, number of digesters, products, wood species applied, etc. Therefore, the following presentation gives only the main features of the systems. Early systems had very similar main control functions: production rate control, cooking cycle
Authors & references
Edited by:
Professor Emeritus Kauko Leiviskä, University of Oulu
Based on: Leiviskä, K., Process control in the fibre line (Chapter 5). In: Leiviskä, K. (ed), Process and Maintenance Management, (Book 14), Papermaking Science and Technology. 2nd edition. Jyväskylä, 2009, Paper Engineer’s Association/Paperi ja Puu Oy. pp. 95–130.
References:
- Brewster, D. B., Robinson, W. I., 1975. How computers are controlling the functions in the pulping process. In: Practical Computer Applications for the Pulp and Paper Industry (K.E. Lowe, editor). Miller Freeman Publications, San Francisco. 81. ISBN 978–0879300364.
- Powell, R. P. 1979. Computerized process-controls on batch digesters save energy. TAPPI J. 62(12)21–23. ISSN 0734–1415.
- Keinänen, P., Rinne, R., Poranen, T. 2002. New analysis methods for better digester management. African Pulp and Paper Week. Durban, South Africa, Oct. 8–11.
- Dorris, G. M., Allen, L. H. 1989. Conductivity sensors for slaker control: Part I – Laboratory Results. Pulp Paper Science. 15(4):122–131. ISSN 0826–6220.
- Wells, C. H. 1990. Effective alkali sensors for batch digester control. TAPPI J. 73(3):181–187. ISSN 0734–1415.
- Shen, W.B. and Chen, X.Q. 2009. Measuring and Controlling Model of Pulp Kappa Number with Spectroscopy during Batch Sulfite Pulping Process. Industrial Engineering Chemistry Research 48:8980–8984.
- Xin, L.P., Yu, P. and Zhou, Y.G. 2018. Dissolved lignin monitoring-based model for end-point control during displacement Kraft pulping. Bioresources 13(4):8528-–38.
- Chai, X.S., Hou, Q., Zhu, J.Y. and Ban, W. 2003. Online monitoring of alkali sulfide, and dissolved lignin during wood pulping by attenuated total reflection – ultraviolet spectroscopy and flow injection techniques. Industrial Engineering Chemistry Research 42:254–258.
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This page has been updated 25.11.2020