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On the benefit of integration of a district heating system with industrial excess heat: an economic and environmental analysis
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering, Energy system.ORCID iD: 0000-0001-5574-8372
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering, Energy system. Department of Management and Engineering, Division of Energy Systems, Linköping University, Linköping, Sweden.
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering, Energy system. Department of Management and Engineering, Division of Energy Systems, Linköping University, Linköping, Sweden.
2017 (English)In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 191, 454-468 p.Article in journal (Refereed) Published
Abstract [en]

Energy-related cooperation using industrial excess heat (IEH) in district heating (DH) networks shows economic and environmental benefits. A rarely investigated approach is the energy cooperation which incorporates a jointly operated CHP plant also producing process steam for nearby industry. The present study aims to evaluate economic and environmental effects on the Hofors DH system with jointly operated CHP plant when the nearby steel mill extends the supply of recovered IEH. Various IEH supply opportunities with different capacities of hot water and steam were designed and compared with existing IEH utilization, plant heat and electricity production and DH system performance. The energy system model MODEST is used for cost-optimization. A parametric study is used to analyze influences of increasing IEH cost and fluctuating electricity prices. The results show advantages for the DH system to utilize IEH for deliveries of DH and process steam and the cogeneration of electricity. Economic and environmental benefits are decreased total system cost (-1.67 MEUR/a), less use of fuels and electricity, and reduced CO2 emissions with a maximal reachable amount of 28,200 ton/a when the use of biofuel is assumed as limited resource and the substituted marginal electricity production is based on coal condensing power plants. The results also show that industrial steam is a preferred heat supply source as long as the steam cost is below the alternative heat production cost, irrespective of the electricity price. While the cost-effective utilization of industrial hot water for DH is more sensitive and affected by a beneficial CHP production based on higher electricity price segments, it is also shown that utilization of continuously supplied industrial hot water is limited during seasons of low DH demand.

Place, publisher, year, edition, pages
2017. Vol. 191, 454-468 p.
Keyword [en]
CHP, MODEST, Marginal electricity, System cost, Energy use, CO2 emission
National Category
Energy Systems
Identifiers
URN: urn:nbn:se:hig:diva-23746DOI: 10.1016/j.apenergy.2017.01.093ISI: 000395963500036Scopus ID: 2-s2.0-85012164014OAI: oai:DiVA.org:hig-23746DiVA: diva2:1081521
Projects
Ett nytt kylningskoncept för att ta till vara industriellt överskottsvärme från heta kroppar; HIG-FORSK 2012/66
Funder
Swedish Energy Agency
Note

The work has been carried out as part of a project with a new cooling concept in the steel industry, which was financed by the Swedish Energy Agency, the companies Varmevarden AB (Hofors Energi AB), Ovako AB and the Clean Production Center. All companies and participants are greatly acknowledged for their support and contributions.

Available from: 2017-03-14 Created: 2017-03-14 Last updated: 2017-06-16Bibliographically approved

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CiteExportLink to record
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Citation style
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