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
Grinding control The basic principles of the wood grinding process have remained unchanged for more than 160 years. During this time, rising pulp quality demands have changed the process control from passive open-loop control to active closed-loop model-based control. In the first grinders, wood was pressed against the revolving grinding stone with simple arrangements where
Authors & references
Edited by:
Professor Emeritus Kauko Leiviskä, University of Oulu
Based on: Björkqvist, T. & Tuovinen, O., Process control in mechanical pulping (Chapter 7, Grinding control). In: Leiviskä, K. (ed.), Process and Maintenance Management (Book 14), Papermaking Science and Technology. 2nd edition. Jyväskylä, 2009, Finnish Paper Engineers´s Association/Paperi ja Puu Oy. pp. 177-188.
References:
- Kunz, W. 1995. Friedrich Gottlob Keller. Gedanken zum 100. Todestag, In: PTSTUD-Symposium Papierzellstoff und Holzstofftechnik ´95, PTS Verlag, München.
- Bergstom, J., Hellstom, H. and Steenberg, B. 1957. Analysis of grinding process variables. Svensk Papperstidning 60(11):409–411.
- Paulapuro, H. 1976. Operating model of a grinder, Part 1. Interdependence of motor load and rate of production of a grinder. Paperi ja Puu 58(1):5–9, 11–13, 15–18.
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This page has been updated 14.11.2020