The wet-end of the centre ply of the paperboard machine n˚ 2 (“Kartongmaskin 2” or KM2) inIggesund was simulated to obtain both qualitative and quantitative results on its start-up dynamics andits variation damping capacity. The accuracy of the model was controlled by comparing the simulationresults with data from the real production process. Furthermore, alternative strategies with theobjective of reducing the time needed for start-ups and grade changes were evaluated.The modeling was done using the Paperfront simulation software. Variables such as layout for themixing system, retention level and amplitude and period of inlet concentration were used asparameters. As alternative operation strategies for start-up and grade change, increased flowrate in theearly phase of a start-up and the temporary overdosing during the beginning of a stock change wereevaluated.The results indicate a strong control of the mixing system over the short circulation both in dynamicsat start-up and in general operation with a time constant for the machine close to 35 minutes. Inaddition, variations in consistency are more easily controlled by a double-chest mixing system and, ingeneral, variations are more easily damped the higher the active volume in the mixing system. Finally,times needed for start-up and composition changes could be reduced by as much as 50% by using amore proactive approach.
| Identifer | oai:union.ndltd.org:UPSALLA1/oai:DiVA.org:kth-238648 |
| Date | January 2018 |
| Creators | Ciucani, Eugenio |
| Publisher | KTH, Skolan för kemi, bioteknologi och hälsa (CBH) |
| Source Sets | DiVA Archive at Upsalla University |
| Language | English |
| Detected Language | English |
| Type | Student thesis, info:eu-repo/semantics/bachelorThesis, text |
| Format | application/pdf |
| Rights | info:eu-repo/semantics/openAccess |
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