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Optimization of a Sawmill-Based Polygeneration Plant
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology.ORCID iD: 0000-0002-3950-0809
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Energy and Climate Studies, ECS.ORCID iD: 0000-0001-7972-0876
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology.
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology.ORCID iD: 0000-0002-3661-7016
2013 (English)In: Proceedings of the ASME Turbo Expo 2013, ASME Press, 2013Conference paper, Published paper (Refereed)
Abstract [en]

Biomass-based fuels have attracted worldwide interest due to their plentiful supply and their environmentally friendly characteristics. In many cases they are still considered waste but for most industries in Sweden, biomass has changed from being simply a disposal problem to become an important part of the energy supply, thanks to the long-term efforts made by the government, researchers and industry, where energy policies have played an important role. However, the amount of power that could be generated from biomass resources is much greater than that which is currently used. To effectively capture this resource requires a new generation of biomass power plants and their effective integration into already existing industrial processes.The implementation of an integrated polygeneration scheme requires the simultaneous consideration of technical, economic and environmental factors to find optimum solutions. With this in mind, a unified modeling approach that takes into account thermodynamic as well as economic and environmental aspects was used. The analysis was done using ASPEN Utilitiesand the MATLAB optimization toolbox. A specific case of a sawmill in Sweden, with an annual capacity of 130’000 m3 of sawn wood, has been analyzed and different options for generating electricity and process heat (for the sawmill and fora district heating network) as well as densified biofuels was analyzed. Optimization was then applied for different configurations and operational parameters. The results show that the sawmill has the capability to not only supply its own energy needs, but also to export from 0.4 to 1MW of electricity to the grid, contribute 5 to 6 MWth of district heating and 20 000 ton/y of biomass pellets. The production of pellets helps to maintain the electricity production throughout the year when the district heating demand is lower. However, the levelized electricity cost is higher than the usual electricity price in the Nordic electricity market and may have difficulty to competing with low-cost electricity sources, such as nuclear energy and hydropower. Inspite of this, polygeneration remains attractive for covering the energy demands of the sawmill and pelletization plant.

Place, publisher, year, edition, pages
ASME Press, 2013.
Series
Proceedings of the ASME TurboExpo 2013, GT2013-95844
Keyword [en]
Bioenergy; polygeneration; pellets; wood; sawmill; multiobjective optimization
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-123681DOI: 10.1115/GT2013-95844Scopus ID: 2-s2.0-84890179727ISBN: 978-079185513-3 (print)OAI: oai:DiVA.org:kth-123681DiVA: diva2:628497
Conference
ASME Turbo Expo 2013: Turbine Technical Conference and Exposition, GT 2013; San Antonio, Tx; United States
Funder
Swedish Energy Agency, P-30148
Note

QC 20140116

Available from: 2013-06-14 Created: 2013-06-14 Last updated: 2016-04-19Bibliographically approved
In thesis
1. On the optimal use of industrial-generated biomass residues for polygeneration
Open this publication in new window or tab >>On the optimal use of industrial-generated biomass residues for polygeneration
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Increasing energy demand as well as climate change concerns call for an analysis and optimization of energy services. Efficient use of energy resources, mitigation of environmental effects and supply an increasing demand are just some of the issues that are relevant nowadays in the energy system. In this regard, worldwide efforts are being made to increase the use of renewable energy and to promote energy efficiency measures in order to reduce the emission of greenhouse gases.

Thus, sustainable solutions that take a holistic approach on covering the demands of the society are needed.  The work presented herein addresses the use of industrial derived biomass residues for energy purposes in different contexts. The analysis was focused on: a) different alternatives to use solid palm oil residues in the Colombian mills for energy purposes including services b) the possibilities of implementing biomass-based heat and power plants in the Swedish energy system and their integration with already established biomass processing industries for polygeneration purposes.

The assessment of the palm oil residues consisted on a technical analysis of the possible alternatives for electricity, heat, and biofuels production. For that, a thermodynamic approach was used to evaluate different alternatives.  The assessment of biomass power plant integrated with the Swedish industry considered the thermodynamic, economic and environmental factors associated with certain energy conversion technologies. In this case a multiobjective optimization methodology was used to perform the thermoeconomic analysis. This allowed the evaluation of two contrasting scenarios were polygeneration at industrial level could be suggested: a less economically developed country where environmental policies are limited and industrial energy efficiency has not been implemented and a high income country with energy and environmental policies well established and energy efficiency measures being encouraged.

Results show that the palm oil industry in Colombia has the capacity of being self-sufficient to cover of all their energy needs using the solid residues available. In the case of the thermoeconomic assessment of biomass-based integrated polygeneration plants in Sweden the results indicate that it is feasible to produce power while supplying the process steam required by nearby industries and district heating.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2014. xx, 100 p.
Series
TRITA-KRV, ISSN 1100-7990 ; 2014:01
Keyword
Polygeneration, Optimization, Palm Oil, Biomass, forest residues, Colombia, Sweden
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-140312 (URN)978-91-7501-990-1 (ISBN)
Public defence
2014-02-04, B3, Brinellvägen 23, KTH Royal Institute of Technology, Stockholm, 10:00 (English)
Opponent
Supervisors
Funder
Sida - Swedish International Development Cooperation Agency, SWE-2005-386Swedish Energy Agency, P30148
Note

QC 20140121

Available from: 2014-01-21 Created: 2014-01-20 Last updated: 2014-01-21Bibliographically approved

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Salomon Popa, MarianneGómez Galindo, María FernandaMartin, Andrew

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