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  • 1.
    Olofsson, D.
    et al.
    Swerea MEFOS, Department of Process Integration.
    Sandberg, Johan
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.
    Fuel mixture optimisation in the grate-giln process at a Swedish mining company2014In: 21st International Congress of Chemical and Process Engineering, CHISA 2014 and 17th Conference on Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction, PRES 2014, Czech Society of Chemical Engineering , 2014, Vol. 4, p. 2195-Conference paper (Refereed)
  • 2.
    Riesbeck, Johan
    et al.
    Swerea MEFOS AB.
    Hooey, Lawrence
    Swerea MEFOS AB.
    Kinnunen, Kimmo
    Ruukki Steel.
    Lilja, Jarmo
    Ruukki Steel.
    Hallin, Mats
    LKAB.
    Sandberg, Johan
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.
    Global effects of closing down sinter plant at Ruukki Raahe integrated steel works2013Conference paper (Other academic)
  • 3.
    Riesbeck, Johan
    et al.
    Swerea MEFOS AB.
    Sandberg, Johan
    Wang, Chuan
    Swerea MEFOS AB.
    A system analysis of LKAB Malmberget heating system to centralisation and substitution of fossil fuels to biofuels2012In: PRES 2012, 15th Conference on Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction, AIDIC Servizi S.r.l. , 2012, p. 793-798Conference paper (Refereed)
    Abstract [en]

    An industrial heating system connected to an iron ore mine and iron ore upgrading processing system is presented. The profitability of introducing measures for increased energy efficiency and improved waste heat utilisation has been investigated. The results show that a full centralisation of the system with increased heat recovery and densified wood based boilers is the most financial solution of a life span over twenty years. The system will be more flexible and easy to connect with external users if a centralisation is made. To minimise the risk of increased energy prices it is recommended to increase waste heat utilisation which will be most profitable if the system is centralised. Use of bio based boilers will make the system free from fossil fuels.

  • 4.
    Sandberg, Johan
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.
    Process integration as a tool for energy systems analysis: application to LKAB in Kiruna2011Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    In recent years, increased concern over global warming has put focus on the emissions of fossil CO2 into the atmosphere. Due to a strong relationship between the use of energy and the burning of fossil fuels, reducing society’s energy use has become increasingly important. In the energy intensive process industry, process integration is a field of research that has shown good results for decreased energy use in many industrial branches. This thesis is centred on the introduction of process integration to a new industrial branch for the field ‐ the mining industry. With an overall aim to introduce process integration as a tool for increased energy efficiency of Loussavaara‐Kiirunavaara AB (LKAB) in Kiruna, the application and development of process integration methods is presented. More specifically the thesis deals with process systems modelling by application of the MIND method (Method for analysis of INDustrial energy systems) and the optimisation of those models by MILP (Mixed Integer Linear Programming) optimisation. Among the results of this thesis are; the presentation of optimised operational strategy for utility boilers that can decrease fuel use with 7%, thedevelopment of a new method for facilitated multi‐period optimisation of dynamic systems and the proposal of a heat recovery installation in the mine ventilation system capable of decreasing the heating systems fuel use by 67%.

  • 5. Sandberg, Johan
    et al.
    Dahl, Jan
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.
    Adaptation and development of process integration tools for an existing iron ore pelletising production system2008In: Proceedings of the 18th International Congress of Chemical and Process Engineering: 24th - 28th August - Prague - Czech Republic, Prague: ČSCHI - Czech Society of Chemical Engineering , 2008, Vol. 4Conference paper (Refereed)
    Abstract [en]

    Energy consumption has been in focus in the mining industry for some time and efforts to optimise the energy consumption in individual process steps have been made with fairly good results. However, until now process integration techniques has been sparsely utilised. In this paper a project aimed to develop and apply process integration techniques for the processing units of a magnetite based iron ore upgrading plant producing mainly iron ore pellets is described. The iron ore upgrading system in focus within this research project is the LKAB facilities in Kiruna in the north of Sweden. A brief introduction of the iron ore upgrading system of LKAB in Kiruna is given. The background problem is formulated and an overview of MIND/reMIND, the main methods and tools to be used in the project are described. Finally, some of the main focus areas of the optimisation are discussed. The paper ends with some closing statements regarding the current status of the project and the future work.

  • 6.
    Sandberg, Johan
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.
    Larsson, Mikael
    Wang, Chuan
    Analysis of oxygen enrichment and its potential influences on the energy system in an integrated steel plant using a new solution space based optimization approach2013In: International Journal of Energy Engineering, ISSN 2225-6563, Vol. 3, no 2, p. 28-33Article in journal (Refereed)
    Abstract [en]

    With oxygen enrichment in hot stoves (HS) the high calorific coke oven gas can be saved due to the possibility of using lower calorific gases which enables replacement of other imported fuels such as oil or LPG. The application of oxygen enrichment in hot stoves or increased O2 content in the blast to the blast furnace (BF), will also potentially lead to lower coke rate. The demand for coke oven gas depends on internal operation logistics and it also has outdoor temperature dependence through a heat and power plant producing district heat to the community. An analysis of the influence of increased oxygen enrichment in HS-BF on the entire energy system has been carried out by using an optimization model. A method of achieving a high time resolution in MILP optimisation is applied in the analysis. Different strategies have been suggested for minimum energy consumption at the studied steel plant and the nearby combined heat and power (CHP) plant. Central to the performance in system optimisation is the ability to analyse and properly describe the system variations.

  • 7.
    Sandberg, Johan
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.
    Larsson, Mikael
    Wang, Chuan
    Dahl, Jan
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.
    Lundgren, Joakim
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.
    A new optimal solution space based method for increased resolution in energy system optimisation2012In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 92, no 1, p. 583-592Article in journal (Refereed)
    Abstract [en]

    In this paper a new method for increased time resolution in multi-period Mixed Integer Linear Programming (MILP) optimisation is presented and applied to a district heating system. The proposed method facilitates the analysis of many time periods in multi period MILP optimisation projects. In the paper, a 365 time period model spanning 1 year developed with the novel method is compared to a 12 time period model developed with a more conventional methodology. The new method offers a significant decrease in the amount of input data for multi period models and facilitates changes to the analysed time span or resolution in time. In the application of the new method oil savings of 7% compared to the current operational strategy of the district heating system are revealed.

  • 8.
    Vesterlund, Mattias
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.
    Sandberg, Johan
    Luleå University of Technology, Department of Engineering Sciences and Mathematics.
    Lindblom, Bo
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.
    Dahl, Jan
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.
    A new method for modeling district heating systems2012Conference paper (Refereed)
    Abstract [en]

    Due to the mining of iron ore by the local mining industry (LKAB) a deformation zone is approaching the town of Kiruna, which is situated in the north of Sweden. The town is going through an urban transformation and parts of the town is about to be relocated. The relocating of the town is affecting all the infrastructure of the town, one of those is the district heating system. The aim of this paper is to apply a process integration method to study how the existing district heating system is behaving and to create a model for the whole district heating system.The district heating system in the town has a complex design with several loops. When dealing with modeling of a district heating system there are two methods that are most common, the Danish- and the German methods. These methods allow for simplification of the network shape, still with good accuracy in system behavior compared to real system behavior. A disadvantage with these two methods is that they cannot handle a district heating system that contains loops without making changes compared to the real physical system.A method that allows modeling of loops in the district heating system has been developed, using the remind-software. This method makes it possible to analyze how loops in the district heating system are behaving, without making physical changes when modeling the district heating system. The model will be used as a default model for redesigning the district heating system when moving the town. It will also be used to optimize heat deliveries from LKAB district heating system and for analyzing the possibility for seasonal storage of waste energy from LKAB and municipality energy company TVAB or how new heat production plants should optimized.In this paper the method is described and applied in order to model the whole present district heating system for the town.

  • 9.
    Vesterlund, Mattias
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.
    Sandberg, Johan
    Luleå University of Technology, Department of Engineering Sciences and Mathematics.
    Lindblom, Bo
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.
    Dahl, Jan
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.
    Evaluation of losses in district heating system, a case study2013Conference paper (Refereed)
    Abstract [en]

    To be able to create a model that accurately describes a district heating system, it is important to identify the thermal losses and how they are distributed. However, general methods targeting the determination of losses are scarce in the literature. In the current case the losses for a district heating system in Kiruna, a town in northern Sweden, has been estimated in the year 2010 to be 12%, which is in the range for a typical Swedish network. Unfortunately, detailed information of the thermal losses is lacking.In this paper two methods to determine loss distribution in a district heating system are presented.Two databases of pipe lengths and diameters have been compiled for two piping categories, loops and feeds. Any missing data regarding pipe diameters in the map has then been determined with the two different methods.In the first method average pipe diameters for loops and feeds are calculated. All pipes with unknown diameter are then assumed to have the average one. The second method considers a percentage based distribution of known diameters and assigns the same distribution to the missing pipe diameters. The losses were estimated in the whole system according to the data from a pipe producer catalogue, in which losses are calculated according to current European standard. The results show that the losses in the system are similar to the losses caused by pipes with the lowest insulating capacity.By using the two methods two fictitious pipe series reproducing exactly the losses in the system are created by scaling the calculated losses of the catalogue pipe series which would give the most similar losses (the one with the lowest insulating capacity). This adjustment was +3.1% by using the first method, and +4.9% by using the second method.The major conclusion of this study is that, both methods can be used for calculating the distribution of thermal losses in the district heating system of Kiruna; moreover, this kind of analysis can be an important tool for analyzing investments in the district heating network in Kiruna.

  • 10.
    Wang, Chuan
    et al.
    Center for Process Integration in Steelmaking, Swerea MEFOS, Luleå.
    Sandberg, Johan
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.
    Larsson, Mikael
    Swerea MEFOS AB.
    Analysis of oxygen enrichment and its potential influences on the energy system in an integrated steel plant using a new solution space based optimization approach2011In: PRES'11: 14th Conference on Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction, AIDIC Servizi S.r.l. , 2011, Vol. 25, p. 87-92Conference paper (Refereed)
    Abstract [en]

    With oxygen enrichment in hot stoves the high calorific coke oven gas can be saved due to the possibility of using lower calorific gases which enables replacement of other imported fuels such as oil or LPG. The application of increased oxygen use in hot stoves or increased O2 in blast, will also potentially lead to lower coke rate. Central to the performance in system optimisation is the ability to analyse and properly describe the system variations. The demand for coke oven gas is depending on both internal operation logistics but it also has outdoor temperature dependence through a heat and power plant producing district heat to the community. An analysis of the influence of increased oxygen enrichment on the entire energy system has been carried out by use of an optimization model. A method of achieving a high time resolution in MILP optimisation is applied in the analysis. Different strategies have been suggested for minimum energy consumption at the studied steel plant and the nearby CHP plant.

1 - 10 of 10
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  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
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  • en-GB
  • en-US
  • fi-FI
  • nn-NO
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  • asciidoc
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