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Analysing the costs, energy use and environmental performance of an integrated steel plant by applying a multi-objective approach
Linköping University, Department of Mechanical Engineering, Energy Systems. Linköping University, The Institute of Technology.
Division of Energy Engineering, Department of Mechanical Engineering, Luleå University of Technology.
(English)Manuscript (preprint) (Other academic)
Abstract [en]

Industrial decision-making is often of a multi-objective character and has become even more so in recent years as environmental issues have become more important. The aim of this paper is to analyse the relationships between different criteria by applying a multi-objective approach when optimising an integrated steel plant with a connected combined heat and power plant. Based on this analysis, the endeavour is to create a better foundation for strategic decision-making, with regard to both operation practice and investment strategy. The system is modelled with a tool that uses mixed integer linear programming, where both single and multi-objective optimisations have been performed. For the multi-objective approach, the ε-constraint method is used and the results are presented by creating pareto optimal fronts to make it easier to overview the solutions. The results show that the applied methodology is useful for facilitating the work of both determining which factors are the crucial ones for the different objectives and analysing how the objectives affect each other.

National Category
Engineering and Technology
URN: urn:nbn:se:liu:diva-87670OAI: diva2:593677
Available from: 2013-01-21 Created: 2013-01-21 Last updated: 2013-01-21
In thesis
1. Optimisation and co-operative perspectives on industrial energy systems
Open this publication in new window or tab >>Optimisation and co-operative perspectives on industrial energy systems
2004 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Increased global competition and growing environmental concerns around the world are two major trends affecting companies today. Tougher competition has led companies to focus primarily on their core business activities, which may lead to a shortage of resources for support activities, such as energy management. This development takes place while environmental concerns step up requirements regarding companies' environmental performance, with global warming at the forefront. Together these issues have increased the management complexity and thus the need for relevant decision support. The purpose of this thesis is to study ways to reach a more comprehensive view of industrial energy systems than is the case today, and thereby achieve more efficient systems.

One theme in this thesis is to investigate analysis approaches, mainly based on optimisation, that can help to produce a comprehensive view of industrial energy systems. The subject of the studies was an integrated steel plant in Sweden which has a connected CHP plant that uses the excess process gases from the steel plant as fuel. The studies included analyses of the operation planning during both internal process variations and changed external conditions. They also included analyses of relations between objectives such as cost, energy use, and environmental performance by applying a multi-objective approach. The analyses proved to provide a comprehensive view of how the system reacts to various changes, which factors are the essential ones for different objectives, and what trade-offs can be made between the objectives.

In addition to this, two studies were conducted of energy-related co-operations between companies. The first looked at co-operation where energy service companies bring competence and other resources related to energy efficiency to the pulp and paper industry. The main aspects of concern were: the managers' views on the opportunities and risks with energy-related co-operation; and its implications for industrial energy management. The second study investigated co-operation between process industries and municipal energy companies with regard to indus trial waste heat deliveries and jointly owned combined heat and power plants. The study emphasised incentives for and barriers to this kind of co-operation. In both studies it was found that trust between the parties is important, that the form of the contract is also important especially to bring the focus to bear on common benefits rather than just one's own, and to reduce the risks involved in co-operation.

Based on the performed studies possible implications of decision support based on optimisation and co-operation between companies are discussed.

Place, publisher, year, edition, pages
Linköping: Linköpings universitet, 2004. 98 p.
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 913
National Category
Engineering and Technology
urn:nbn:se:liu:diva-22683 (URN)1974 (Local ID)91-85295-95-7 (ISBN)1974 (Archive number)1974 (OAI)
Public defence
2004-12-02, Sal C3, Hus C, Linköpings Universitet, Linköping, 10:15 (Swedish)
Available from: 2009-10-07 Created: 2009-10-07 Last updated: 2013-01-21

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