Simulering av energiflöden under metalliseringsprocess: Med avseende på energibesparing och minskade koldioxidutsläpp
Independent thesis Basic level (university diploma), 15 credits / 22,5 HE creditsStudent thesis
Metso Paper Sweden AB produces Yankeecylinders for paper machines. To give the cylindersa stronger surface, and thereby a longer operating time between sharpening, Metso PaperSweden AB has recently begun to give the cylinders a stronger metal surface. During the socalledmetallization process, where the cylinder goes through a thermal coating and receivesa stronger finish the cylinder must be kept under pressure. This pressurization requiresenergy and generates in the current situation a large amount of carbon emissions becausethe boiler pressurizing the cylinder is operated with fossil fuel oil. To reduce energyconsumption and carbon emissions, the company has decided to explore the possibility oflowering the pressure during the process and explore the energy savings and reduction incarbon emissions the action would lead to. The company now has a pending permitapplication for expanded production and wants to justify that with lower energyconsumption and also look at the possibility of switching to a renewable fuel.In order to identify the flow of energy that occur during the metallization process a dynamicmodel is built in the program SIMULINK. The model calculates energy-/fuel saving obtainedas a consequence of pressure reduction and installation of insulated panels during theprocess as well as during the heating of the cylinder. Following the results obtained fromsimulations of the model the reduction of carbon emissions in the different cases arecalculated. To reduce carbon emissions further, the possibility of switching to a renewablefuel for pressurizing the cylinder is examined. Solutions to the existing boiler were examinedfor fuels such as biogas, RME and bio-oil.The results obtained from simulations of the model show that the decrease in pressureduring the process results in significant energy conservation up to approximately 652 MWhper year, which corresponds to approximately 65,9 % of the energy consumption for thepressurizing during metallization process during one year. This action does also lead toreduced carbon emissions. To assemble the isolated panels during the process gives a fuelsaving of approximately 4-9 %. To reduce carbon emissions further a switch to bio-oil or RMEwould be a good alternative, a new burner can be installed in the existing boiler and theexisting oil tank can be used if a heating cable is installed and the tank isolated (bio-oil). Inorder to significantly reduce both carbon emissions and energy consumption during theprocess a combination of reduced pressure and the transition to a renewable fuel should bemade. This change would justify approval of the permit application for expanded production.
Place, publisher, year, edition, pages
2013. , 22 p.
Energiflöden, Simulering, Koldioxidutsläpp, Simulink
IdentifiersURN: urn:nbn:se:kau:diva-28609Local ID: EM:3OAI: oai:DiVA.org:kau-28609DiVA: diva2:639897
Metso Paper Sweden AB
Subject / course
Bachelor of Science in Enviromental and Energy Engineering, 180 hp
Rezk, Kamal, Doktorand
Strawreberg, Lena, Universitetslektor