Improving Municipal CHP Production Efficiency by Integrating Biomass Upgrading

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.advisor Laukkanen, Timo P., Dr., Aalto University, Department of Mechanical Engineering, Finland
dc.contributor.author Kohl, Thomas
dc.date.accessioned 2016-11-16T10:01:32Z
dc.date.available 2016-11-16T10:01:32Z
dc.date.issued 2016
dc.identifier.isbn 978-952-60-7142-8 (electronic)
dc.identifier.isbn 978-952-60-7144-2 (printed)
dc.identifier.issn 1799-4942 (electronic)
dc.identifier.issn 1799-4934 (printed)
dc.identifier.issn 1799-4934 (ISSN-L)
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/23488
dc.description.abstract Reducing CO2 emissions in order to abate climate change is one of the biggest challenges currently facing societies. The efficient and sustainable use of biomass conversion technologies for energy purposes is one important means of mitigating CO2 emissions while simultaneously reducing the need to import energy. However, compared to fossil fuels, biomass conversion per se suffers from lower energetic conversion efficiencies. New well-designed, deeply heat and material-integrated processes can help to overcome this obstacle. As an abundant but widely scattered resource, biomass should primarily be used locally or else upgraded before transport to central installations. Biomass-based, combined heat and power (CHP) production is an established and efficient technology that has proved it can compete with the conventional methods of energy generation under current tax regimes. However, increased use of biomass raises the price for limited biomass feedstock, and, in the future, it might hamper the affordability of municipal biomass-fired CHP plants. In order to react to the expected increase in competition for restricted biomass resources, communal CHP plants should be integrated with biomass upgrading processes that add valuable products to the portfolio. The objective of the thesis is to investigate the influence of integrating three different biomass upgrading processes, pelletising, torrefaction and fast pyrolysis, with a municipal CHP plant. In particular, their influence on important operational parameters, the energetic and environmental performance of the plant as well as the plant's finances, should be taken into account. With respect to the latter aspects of system's performance, a concise and significant assessment methodology that makes it easy to compare the processes yielding multiple products is developed and assessed in this study. The study shows that all three integration options are quite possible within the operational limits of the CHP plant. By utilising free boiler capacity during times of low district heating demand, high bio-product yields and greater district heating output can be realised, which in turn leads to improved primary energy (PE) efficiency and reduced CO2 emissions. Despite its lower energetic and exergetic efficiency, the integration of fast pyrolysis demonstrated the best economic performance. The thesis also concludes by arguing that the results obtained via thermal efficiency analysis do not add any new information to the results obtained via exergy and PE analyses. Exergy and PE analyses should be the preferred means for process assessment. en
dc.format.extent 73 + app. 83
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher Aalto University en
dc.publisher Aalto-yliopisto fi
dc.relation.ispartofseries Aalto University publication series DOCTORAL DISSERTATIONS en
dc.relation.ispartofseries 241/2016
dc.relation.haspart [Publication 1]: Kohl T, de Moya CG, Fogelholm CJ. Primary Energy Efficiency Consideration of Biomass-to-Liquid Systems Yielding Fischer-Tropsch Fuel. In: Favrat, Daniel; Maréchal, François. ECOS 2010 Proceedings of the 23rd Int. conference on efficiency, cost, optimization, simulation and environmental impact of energy systems. Volume 2 Biomass & Renewable. Lausanne, Switzerland, 2010 June 14.–17. EPFL. ISBN: 978-1456303112. DOI: 10.5075/epfl-infoscience-165006
dc.relation.haspart [Publication 2]: Kohl T, Laukkanen TP, Järvinen MP. Integration of biomass fast pyrolysis and precedent feedstock steam drying with a municipal combined heat and power plant. Biomass Bioenergy 2014 V71:413–430. ISSN: 0961-9534. DOI: 10.1016/j.biombioe.2014.09.014
dc.relation.haspart [Publication 3]: Kohl T, Laukkanen T, Järvinen M, Fogelholm CJ. Energetic and environmental performance of three biomass upgrading processes integrated with a CHP plant. Applied Energy 2013 V107:124–134. ISSN: 0306-2619. DOI:10.1016/j.apenergy.2013.02.021
dc.relation.haspart [Publication 4]: Kohl T, Teles M, Melin K, Laukkanen T, Järvinen M, Park SW, Giudici R. Exergoeconomic assessment of CHP-integrated biomass upgrading. Applied Energy 2015 V156:290–305. ISSN: 0306-2619. DOI:10.1016/j.apenergy.2015.06.047
dc.relation.haspart [Publication 5]: Kohl T, Laukkanen T, Tuomaala M, Niskanen T, Siitonen S, Järvinen M, Ahtila P. Comparison of Energy Efficiency Assessment Methods: Case Bio-SNG process. Energy 2014 V74:88–98. ISSN 0360-5442. Doi:10.1016/j.energy.2014.03.107
dc.relation.haspart Corrigendum to publication III in: Applied Energy 2015;145:374-5. DOI:10.1016/j.apenergy.2015.02.080
dc.relation.haspart Corrigendum to publication IV in: Applied Energy 2016 V181:590-591. Proof. DOI:10.1016/j.apenergy.2016.07.092
dc.subject.other Energy en
dc.subject.other Environmental science
dc.title Improving Municipal CHP Production Efficiency by Integrating Biomass Upgrading en
dc.type G5 Artikkeliväitöskirja fi
dc.contributor.school Insinööritieteiden korkeakoulu fi
dc.contributor.school School of Engineering en
dc.contributor.department Konetekniikan laitos fi
dc.contributor.department Department of Mechanical Engineering en
dc.subject.keyword biomass en
dc.subject.keyword combined heat and power en
dc.subject.keyword district heating en
dc.subject.keyword fast pyrolysis en
dc.subject.keyword torrefaction en
dc.subject.keyword wood pellets en
dc.subject.keyword energy efficiency en
dc.subject.keyword exergy en
dc.identifier.urn URN:ISBN:978-952-60-7142-8
dc.type.dcmitype text en
dc.type.ontasot Doctoral dissertation (article-based) en
dc.type.ontasot Väitöskirja (artikkeli) fi
dc.contributor.supervisor Järvinen, Mika P., Prof., Aalto University, Department of Mechanical Engineering, Finland
dc.opn Manninen, Jussi, Dr., VTT Technical Research Centre of Finland Ltd, Finland
dc.opn Thunmann, Henrik, Prof., Chalmers University of Technology, Sweden
dc.contributor.lab Energy Engineering and Environmental Protection en
dc.rev Thunmann, Henrik, Prof., Chalmers University of Technology, Sweden
dc.rev Vakkilainen, Esa, Prof., Lappeenranta University of Technology, Finland
dc.date.defence 2016-11-25


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