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Dynamic model and simulation for a high consistency refining process
Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
2016 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 31, no 1, p. 88-101Article in journal (Refereed) Published
Abstract [en]

A novel dynamic model for the behavior inside of the gap of a high consistency refiner in the pulp and paper industry is presented. As the original entropy model gives additional information about the work split between thermodynamic effects and fiber changes inside the refining zone, it is used as a base for a dynamic model to describe the efficiency of the refining process. This model is derived for the mass flow rates of steam and water, changes of the work distribution and consistency as a function of radius and time. The temperature distribution inside the refining zone, specific energy, inlet consistency and total mass flow rate are used as input signals. After a general presentation in continuous-time, the spatial discrete model is also discretized in temporal dimension. Both discretizations are dependent on each other as the ratio can be considered as a flow speed of the fluid elements and it affects the residence time inside the refining zone. Thereafter, results from a simulation with assumed input parameters using the discrete model are presented and compared with the output of previously published models. Other dynamic models exhibit similar oscillations when applying changes to the inputs. Furthermore, the overall general trend is consistent with other published steady-state models. Hence, we expect the newly proposed model to be reliable and more efficient to describe the behavior inside the refining zone.

Place, publisher, year, edition, pages
2016. Vol. 31, no 1, p. 88-101
National Category
Control Engineering
Research subject
Control Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-6688Local ID: 4f4ffb97-6dbd-4332-ac93-f28f43aaeecbOAI: oai:DiVA.org:ltu-6688DiVA: diva2:979574
Note
Validerad; 2016; Nivå 2; 20160329 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved

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