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
Quality control of TMP refiners Freeness, fibre length distribution, and shive content define the quality of refiner pulps. Fibre length distribution means the long-fibre content in practice. The first two properties can be controlled by adjusting refiner operation. Shive control usually means changes in the pulp flow to the reject refiner. A definition of “good”
Authors & references
Edited by:
Marko Loisa, Siemens Osakeyhtiö
Based on: Loisa, M., Refiner control (Chapter 7, Process control in mechanical pulping). 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. 166–176.
References:
- Kortelainen, J., Nystedt, H. and Parta, J. 1997. Optimizing the refining conditions with on-line controls. In: International Mechanical Pulping Conference, Stockholm, Sweden, June 9–13:103–111.
- Strand, B. C., Mokvist, A., Falk, B. and Jackson, M. 1993. The effect of production rate on specific energy consumption in high consistency chip refining. In: International Mechanical Pulping Conference. Oslo, Norway, June 15–17:143–151.
- Loisa, M., Nybom, H., Kortelainen, J., Jakobsson, J. and Tukiainen, K. 2004. Freeness soft sensor in TMP-refining. In: Control Systems 2004 Conference, Quebec City, Canada, June 14–18:227–231.
- Kaunonen, A. and Luukkonen, M. 1991. Practical experiences of the use of a continuous freeness measurement. In: International Mechanical Pulping Conference, Minneapolis, MN, June 2–5. TAPPI PRESS:109–114.
- Euhus, L., Strand, B.C, Shearin, D., Fralic, G. and Edvall, M. 2003. Optimization of LWC TMP using advanced quality control. In: International Mechanical Pulping Conference, Quebec City, Canada, June 2–5:375–378.
- Strand, B. C. 1998. Quality control of high consistency refiners. TAPPI J. 81(12):159–164. ISSN 0734–1415.
- Sidhu, M. S., Van Fleet, R., Dion, M. R., Anderson, D. W. and Weger, B. W. 2004. Modelling and advanced control of TMP refiner system. In: Control Systems 2004 Conference, Quebec City, Canada, June 14–18:107–112.
- Myllyneva, J., Leiviskä, K., Kortelainen, J. and Nystedt, H. 1997. Fuzzy control of thermomechanical pulping. In: International Mechanical Pulping Conference, Stockholm, Sweden, June 9–13:381–384.
- Leiviskä, K., Sutinen, R. and Saarinen, K. 1993. Optimal quality control of TMP plants. In: 18th International Mechanical Pulping Conference, EUCEPA, Oslo, Norway, June 15–17:245–248.
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This page has been updated 14.11.2020