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Quality control in continuous digesters
After reading this article you will..
- learn the basic principles of the Kappa number control.
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
Authors & references
Authors:
Professor Emeritus Kauko Leiviskä, University of Oulu
References:
- Williamson, M. 2013. The next generation of online pulping & liquor analysis. ipw on-line.
- Laitinen, M., Kemppainen, A., Backman, M.E. 1999. Midpoint Kappa Measurement – New Possibilities in Digester Control, 1999 Pulping Conference Proceedings.
- Murtovaara, S., Juuso, E., Leiviskä, K., Sutinen, R., Lemmetti, A. 1999. Kappa number prediction based on cooking liquor measurements. In: Proceedings 6th International Conference on New Available Technologies. The World Pulp and Paper Week. Stockholm, Sweden, June 1–4. SPCI. pp. 633–636.
- 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.
- Hodges, R., Krishnagopalan, G.A. 1999. Near infrared spectroscopy for online white and black liquor composition analysis. In: TAPPI Pulping Conference. Orlando, Florida, Oct. 31–Nov. 4. TAPPI PRESS, Atlanta, 1097–1109.
- Haataja, K., Leiviskä, K., Sutinen R. 1997. Kappa number estimation with neural networks. In: 1997 IMEKO World Congress Proceedings. Finnish Society of Automation, vol. XA. Helsinki, 1–5.
- Dyal, B. S., MacGregor, J. F., Taylor, P. A., Kildaw, R., Marcikic, S. 1994. Application of feedforward neural networks and partial least squares regression for modelling Kappa number in a continuous Kamyr digester. Pulp Paper Canada 95(1)26–32.
- Sutinen, R., Joensuu, I., Furst, P., Leiviskä, K. 1990. Advanced Kamyr digester control. In: 1990 EUCEPA Conference Proceedings. Stockholm, May 9–11. SPCI, 253–264.
- Badwe, A. and Satini, R. 2016. Continuous digester optimization using advanced process control. Control Systems 2016, April 27–28, Stockholm, Sweden.
- Mori, Y., Sueda, R. and Takeuchi, S. 2003. Pulp cooking control and wood species change control for a Kamyr continuous digester. SICE Annual Conference, Fukui, Japan, August 4–6, 397–402.
- Doyle, F.J. and Kayihan, F. 1999. Reaction profile control of the continuous pulp digester. Chemical Engineering Science 54:2679–2688.
Videos
Exercises
This page has been updated 14.11.2020