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Upgrading a biomass-based district heating plant in sweden: a technoeconomic optimization and sensitivity analysis
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.ORCID iD: 0000-0002-3661-7016
(English)In: Journal of Cleaner Production, ISSN 0959-6526, E-ISSN 1879-1786Article in journal (Other academic) Submitted
Abstract [en]

District heating systems have contributed with the reduction of greenhouse gas emissions by also producing industrial steam, using waste heat from industrial process in the networks and integration of other industrial processes. This paper aims at evaluating the possible upgrading of an existing district heating plant for production of electricity and pellets. The evaluation is carried out by optimizing the alternatives from the economic, thermodynamic and environmental point of view. In order to examine how the design can be optimized, a detailed model of the process has been elaborated using ASPEN Utilities and Matlab optimization toolbox. The parameters of the polygeneration plant have then been varied in order to examine how optimal economic benefit can be extracted from the biomass streams whilst still meeting the fundamental process demands of the industries and heat demand of the community. A multi-objective optimization has been used to investigate the Pareto-optimal trade-offs that exist between low electricity costs and investment cost. The resulting polygeneration plant designs conclude that it is feasible to produce 18 and 25 MW of power while at the same time supplying the process steam required by the nearby industries and district heating for the community. The results also shown that it is feasible to operate the plant more hours per year by producing pellets and  it could be possible to generate additional district heating (up to 25 ton/h of hot water) to cover the demands of a growing community.

Keyword [en]
Bioenergy; polygeneration; district heating; pellets; multiobjective optimization; genetic algorithms
National Category
Energy Engineering
URN: urn:nbn:se:kth:diva-140237OAI: diva2:689300
Swedish Energy Agency, P30148

QCR 20160620

Available from: 2014-01-20 Created: 2014-01-20 Last updated: 2016-06-20Bibliographically 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.
TRITA-KRV, ISSN 1100-7990 ; 2014:01
Polygeneration, Optimization, Palm Oil, Biomass, forest residues, Colombia, Sweden
National Category
Energy Engineering
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)
Sida - Swedish International Development Cooperation Agency, SWE-2005-386Swedish Energy Agency, P30148

QC 20140121

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

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