Increased system benefit from cogeneration due to cooperation between district heating utility and industry
2004 (English)In: Proceedings of the 9th international symposium on district heating and cooling, Espoo, Finland, 30-31 August., 2004, 97-104 p.Conference paper (Refereed)
District heating and steam supply in the town Örnsköldsvik in northern Sweden is in focus for this study. Low temperature waste heat from pulp manufacturing in the Domsjö mill is now utilised for district heating production in heat pumps, which dominate district heating supply. Based on this traditional cooperation between the local district heating utility and the pulp industry, the parties discuss a partial outsourcing of the industrial steam supply to the utility, which may enable beneficial system solutions for both actors. The local utility must find a new location for a heating plant because a railway line is being built at the heat pump site. Planning for a new combined heat and power production (CHP) plant has started but its location is uncertain. If the plant can be situated close to the mill it can, besides district heating, produce steam, which can be supplied to adjacent industries. The municipality and its local utility are also considering investing in a waste incineration plant. But is waste incineration suitable for Örnsköldsvik and how would it interact with cogeneration?
Alternative cases have been evaluated with the MODEST energy system optimisation model, which minimises the cost for satisfying district heating and steam demand. The most profitable solution is to invest in a CHP plant and a waste incineration plant. Considering carbon dioxide emissions, the results from applying a local or a global perspective are remarkably different. In the latter case, generated electricity is assumed to replace power from coal condensing plants elsewhere in the North-European power grid. Therefore, minimum global CO2 emissions are achieved through maximal electricity production in a CHP plant. From this viewpoint, waste incineration should not be introduced because it would obstruct cogeneration. The study is carried out within the program Sustainable municipality run by the Swedish Energy Agency.
Place, publisher, year, edition, pages
2004. 97-104 p.
District heating, cogeneration, optimisation, waste incineration, industrial steam supply
Engineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-17213Local ID: TKK-ENY--20OAI: oai:DiVA.org:liu-17213DiVA: diva2:207458