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Publications (10 of 28) Show all publications
Sandberg, J., Larsson, M. & Wang, C. (2013). Analysis of oxygen enrichment and its potential influences on the energy system in an integrated steel plant using a new solution space based optimization approach (ed.). Paper presented at . International Journal of Energy Engineering, 3(2), 28-33
Open this publication in new window or tab >>Analysis of oxygen enrichment and its potential influences on the energy system in an integrated steel plant using a new solution space based optimization approach
2013 (English)In: International Journal of Energy Engineering, ISSN 2225-6563, Vol. 3, no 2, p. 28-33Article in journal (Refereed) Published
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.

National Category
Energy Engineering
Research subject
Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-4275 (URN)23359113-e771-4276-bb90-ade209caf342 (Local ID)23359113-e771-4276-bb90-ade209caf342 (Archive number)23359113-e771-4276-bb90-ade209caf342 (OAI)
Note
Godkänd; 2013; 20130430 (josa)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-06-05Bibliographically approved
Sandberg, J., Larsson, M., Wang, C., Dahl, J. & Lundgren, J. (2012). A new optimal solution space based method for increased resolution in energy system optimisation (ed.). Paper presented at . Applied Energy, 92(1), 583-592
Open this publication in new window or tab >>A new optimal solution space based method for increased resolution in energy system optimisation
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2012 (English)In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 92, no 1, p. 583-592Article in journal (Refereed) Published
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.

National Category
Energy Engineering
Research subject
Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-8005 (URN)10.1016/j.apenergy.2011.11.062 (DOI)000300463800064 ()2-s2.0-84155191069 (Scopus ID)671e5ce1-11ca-4b59-a92e-80203a73a1c2 (Local ID)671e5ce1-11ca-4b59-a92e-80203a73a1c2 (Archive number)671e5ce1-11ca-4b59-a92e-80203a73a1c2 (OAI)
Note
Validerad; 2012; 20111230 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Ji, X., Lundgren, J., Wang, C., Dahl, J. & Grip, C.-E. (2012). Simulation and energy optimization of a pulp and paper mill: evaporation plant and digester (ed.). Paper presented at International Conference on Applied Energy : 16/05/2011 - 18/05/2011. Applied Energy, 97(Spec. Issue), 30-37
Open this publication in new window or tab >>Simulation and energy optimization of a pulp and paper mill: evaporation plant and digester
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2012 (English)In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 97, no Spec. Issue, p. 30-37Article in journal (Refereed) Published
Abstract [en]

A detailed mathematical process integration model of a pulp and paper mill in the Northern Sweden has been developed. The main objective of this work has been set to describe the practical development of the model with particular emphasis on the development of the digester and evaporation plant sub-models. Actual plant measurements have been used to validate the model. By implementing the sub-models into the complete plant model, the influence of different operation parameters on the overall plant performance has been investigated. Furthermore, introductory studies with the main objective to minimize the plant energy cost have been carried out.

National Category
Energy Engineering
Research subject
Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-35782 (URN)10.1016/j.apenergy.2012.01.014 (DOI)000307196000005 ()2-s2.0-84862777463 (Scopus ID)a73fc5ba-ab1d-443b-b327-267b25050e6e (Local ID)a73fc5ba-ab1d-443b-b327-267b25050e6e (Archive number)a73fc5ba-ab1d-443b-b327-267b25050e6e (OAI)
Conference
International Conference on Applied Energy : 16/05/2011 - 18/05/2011
Note

Validerad;2012;20120213 (xiajix);Konferensartikel i tidskrift;Bibliografisk uppgift: Energy Solutions for a Sustainable World - Proceedings of the Third International Conference on Applied Energy, May 16-18, 2011 - Perugia, Italy

Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-07-10Bibliographically approved
Wang, C., Johnsson, A., Wikström, J.-O., Engdahl, J., Asp, B. & Dahl, J. (2011). Modeling analysis on potential energy saving in a Swedish rolling mill (ed.). Paper presented at International Conference on Energy Efficiency and CO2 Reduction in the Steel Industry : 27/06/2011 - 01/07/2011. Paper presented at International Conference on Energy Efficiency and CO2 Reduction in the Steel Industry : 27/06/2011 - 01/07/2011.
Open this publication in new window or tab >>Modeling analysis on potential energy saving in a Swedish rolling mill
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2011 (English)Conference paper, Oral presentation only (Refereed)
National Category
Energy Engineering
Research subject
Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-40224 (URN)f44ac077-6d3e-4cb3-acac-67ad2a6f0fe5 (Local ID)f44ac077-6d3e-4cb3-acac-67ad2a6f0fe5 (Archive number)f44ac077-6d3e-4cb3-acac-67ad2a6f0fe5 (OAI)
Conference
International Conference on Energy Efficiency and CO2 Reduction in the Steel Industry : 27/06/2011 - 01/07/2011
Note
Godkänd; 2011; 20111219 (ysko)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2018-06-05Bibliographically approved
Ji, X., Lundgren, J., Wang, C., Dahl, J. & Grip, C.-E. (2011). Simulation and energy optimization in a pulp and paper mill: Evaporation plant and digester (ed.). In: (Ed.), (Ed.), Third International Conference on Applied Energy: 16-18 May 2011 - Perugia, Italy. Paper presented at International Conference on Applied Energy : 16/05/2011 - 18/05/2011 (pp. 109-122).
Open this publication in new window or tab >>Simulation and energy optimization in a pulp and paper mill: Evaporation plant and digester
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2011 (English)In: Third International Conference on Applied Energy: 16-18 May 2011 - Perugia, Italy, 2011, p. 109-122Conference paper, Published paper (Refereed)
Abstract [en]

A mathematical process integration model of a pulp and paper mill in the Northern Sweden has been developed. The main modelling focus has been put on the two main steam consumers (the evaporation plant and the digester), for which detailed material and energy balances have been established. Operational data have been used to validate the simulation results. By implementing these submodels into the complete plant model, the influence of different operation parameters on the overall plant performance has been investigated. Furthermore, introductory studies with the main objective to minimize the plant energy cost have been carried out. The correlation and differences between economic and energy have been discussed

National Category
Energy Engineering
Research subject
Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-27885 (URN)174fac08-a803-43d1-95fc-eed1fb3b0ed3 (Local ID)174fac08-a803-43d1-95fc-eed1fb3b0ed3 (Archive number)174fac08-a803-43d1-95fc-eed1fb3b0ed3 (OAI)
Conference
International Conference on Applied Energy : 16/05/2011 - 18/05/2011
Note
Godkänd; 2011; 20120131 (xiajix)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-06-05Bibliographically approved
Ji, X., Lundgren, J., Wang, C. & Grip, C.-E. (2011). Simulation and optimization of steam generation in a pulp and paper mill (ed.). In: (Ed.), (Ed.), Proceedings of the World Renewable Energy Congress 2011 (WREC 2011): 9-13 May, Linköping. Paper presented at World Renewable Energy Congress : 09/05/2011 - 13/05/2011. : Linköping University Electronic Press
Open this publication in new window or tab >>Simulation and optimization of steam generation in a pulp and paper mill
2011 (English)In: Proceedings of the World Renewable Energy Congress 2011 (WREC 2011): 9-13 May, Linköping, Linköping University Electronic Press, 2011Conference paper, Published paper (Refereed)
Abstract [en]

A mathematical process integration model for the steam generation part (recovery boiler, bark boiler, and turbine) was developed based on a pulp and paper mill in the Northern Sweden. The material and energy balances were calculated theoretically and then the operation data from a pulp and paper mill in the Northern Sweden were used to validate the simulation results. By implementing it into the whole plant, the effect of the operation conditions on the whole plant performance were investigated. The introductory studies were carried out with an objective function to minimize the energy cost. The influence of different parameters was rigorously studied. The correlation between economic and energy optima was discussed.

Place, publisher, year, edition, pages
Linköping University Electronic Press, 2011
National Category
Energy Engineering
Research subject
Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-28464 (URN)245c9dc6-0287-42e2-a03c-407fa35d1d8b (Local ID)245c9dc6-0287-42e2-a03c-407fa35d1d8b (Archive number)245c9dc6-0287-42e2-a03c-407fa35d1d8b (OAI)
Conference
World Renewable Energy Congress : 09/05/2011 - 13/05/2011
Note
Godkänd; 2011; 20111024 (ysko)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-06-05Bibliographically approved
Wang, C., Nordgren, S., Lindblom, B., Savonen, S., Hedpalm, T., Larsson, M. & Hansson, R. (2010). Conceptual design of an integrated heating system at LKAB Malmberget with consideration of social-environmental damage costs (ed.). Paper presented at . Journal of Cleaner Production, 18(9), 944-951
Open this publication in new window or tab >>Conceptual design of an integrated heating system at LKAB Malmberget with consideration of social-environmental damage costs
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2010 (English)In: Journal of Cleaner Production, ISSN 0959-6526, E-ISSN 1879-1786, Vol. 18, no 9, p. 944-951Article in journal (Refereed) Published
Abstract [en]

LKAB Malmberget is a Swedish mining site located at Malmberget, Sweden. Seven boiler centers are located in the north part of Malmberget. There are no connections in between these boiler centers, meaning that it is a decentralized heating system. The heat generated is used to heat up buildings and for mine ventilation air mainly during the cold periods. The heat is mainly provided from electric and oil boilers. However, most boilers under use are over 20 years old, and it is time to retrofit the boiler system and infrastructure. The purpose of this work is to design and optimize the heating system by introducing an integrated concept to minimize the heat production cost.An optimization model based on the mixed integer linear programming (MILP) has been developed. Several technical options have been considered in a new centralized heating system. The optimization principle is based on two kinds of perspectives: current price and external costs. With consideration of environmental and health damage from society concerns point of view, instead of environmental taxes in the current price perspective, the monetary values of externalities due to pollutants such as CO2, NOx, SO2 and particulates emitted from the heating system are included. On the basis of data input and assumptions, modeling results indicate that a lower cost could be achieved when a waste heat recovery boiler is installed at the older pelletization plant to recover sensible heat from flue gas. This technical option is the best solution or at least contributes to the best solution in all optimization results. Including the externality cost is useful for making fair evaluation of the social-environmental impacts of the alternatives.

National Category
Energy Engineering
Research subject
Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-5754 (URN)10.1016/j.jclepro.2010.01.021 (DOI)000278655800013 ()2-s2.0-77950958069 (Scopus ID)3efcc630-172b-11df-bb43-000ea68e967b (Local ID)3efcc630-172b-11df-bb43-000ea68e967b (Archive number)3efcc630-172b-11df-bb43-000ea68e967b (OAI)
Note
Validerad; 2010; 20100211 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Hooey, P. L., Bodén, A., Wang, C., Grip, C.-E. & Jansson, B. (2010). Design and application of a spreadsheet-based model of the blast furnace factory (ed.). Paper presented at . ISIJ International, 50(7), 924-930
Open this publication in new window or tab >>Design and application of a spreadsheet-based model of the blast furnace factory
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2010 (English)In: ISIJ International, ISSN 0915-1559, E-ISSN 1347-5460, Vol. 50, no 7, p. 924-930Article in journal (Refereed) Published
Abstract [en]

The development and application of a 1-dimensional static blast furnace model, "Masmod", written in a common spreadsheet environment, is described. The model includes blast furnace, hot stove, and burden models with recent additions of other operations including CO2 stripping and top gas recycle. Although blast furnace modelling has become increasingly sophisticated, a relatively simple and flexible model is shown to be useful for evaluating burden options, equipment and operational strategies, and process development. Furthermore the Masmod model has been integrated with global steel plant optimization models and Process Integration models for more complex system analysis and optimization.

National Category
Energy Engineering
Research subject
Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-14553 (URN)dec91950-a6ca-11df-a707-000ea68e967b (Local ID)dec91950-a6ca-11df-a707-000ea68e967b (Archive number)dec91950-a6ca-11df-a707-000ea68e967b (OAI)
Note
Validerad; 2010; 20100813 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-06-05Bibliographically approved
Wang, C., Nordgren, S., Lindblom, B., Savonen, S. & Hansson, R. (2009). Integrated conceptual design of heating system at a Swedish mining company (ed.). In: (Ed.), Jiri Klemeš (Ed.), Pres09 - 12th Conference Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction: . Paper presented at Conference Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction : 10/05/2009 - 13/05/2009 (pp. 129-134). : AIDIC Servizi S.r.l.
Open this publication in new window or tab >>Integrated conceptual design of heating system at a Swedish mining company
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2009 (English)In: Pres09 - 12th Conference Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction / [ed] Jiri Klemeš, AIDIC Servizi S.r.l. , 2009, p. 129-134Conference paper, Published paper (Refereed)
Abstract [en]

LKAB Malmberget is a Swedish mining site located at Malmberget, Sweden. Seven boiler centers are located on north part of Malmberget. There are no connections in between these boiler centers, meaning that it is a decentralized heating system. The heat generated is to heat up buildings and for mine ventilation mainly during the cold periods. The heat is mainly provided from electric and oil boilers. However, most boilers under use are over 20 years old, and it is time to retrofit the boiler system and infrastructure. The purpose of this work is to design and optimize the heating system by the integrated concept. An optimization model based on the mixed integer linear programming (MlLP) has been developed to minimize the total heat production cost, including operation cost and investment cost. The model can be used to calculate how a given heat demand can be satisfied at the lowest possible cost. Four different technical options have been considered in a new centralized heating system. On the basis of data input and assumptions, modeling results indicate that a lower cost could be achieved when a waste heat recovery boiler is installed at the old pelletization plant to recover sensible heat from flue gas. This will lead to a remarkable electricity saving (around 70% saving) compared to the reference case. It has also been noticed that in the optimized cases, oil boilers should not be operated due to a higher price compared to electricity, and by estimation an annual reduction of 3000 ton CO2 and 4.5 ton NOx could be achieved.

Place, publisher, year, edition, pages
AIDIC Servizi S.r.l., 2009
Series
Chemical Engineering Transactions, ISSN 1974-9791 ; 18
National Category
Energy Engineering
Research subject
Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-37282 (URN)10.3303/CET0918019 (DOI)000271673200019 ()2-s2.0-75749134899 (Scopus ID)b43072e0-172f-11df-bb43-000ea68e967b (Local ID)978-88-95608-04-4 (ISBN)b43072e0-172f-11df-bb43-000ea68e967b (Archive number)b43072e0-172f-11df-bb43-000ea68e967b (OAI)
Conference
Conference Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction : 10/05/2009 - 13/05/2009
Note
Godkänd; 2009; 20100211 (ysko)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2018-07-10Bibliographically approved
Wang, C., Ryman, C. & Dahl, J. (2009). Potential CO2 emission reduction for BF-BOF steelmaking based on optimised use of ferrous burden materials (ed.). Paper presented at . International Journal of Greenhouse Gas Control, 3(1), 29-38
Open this publication in new window or tab >>Potential CO2 emission reduction for BF-BOF steelmaking based on optimised use of ferrous burden materials
2009 (English)In: International Journal of Greenhouse Gas Control, ISSN 1750-5836, E-ISSN 1878-0148, Vol. 3, no 1, p. 29-38Article in journal (Refereed) Published
Abstract [en]

Currently, the blast furnace (BF) to basic oxygen furnace (BOF) is the dominant steel production route in the steel industry. The direct CO2 emission in this process system exceeds 1 t of CO2/t of crude steel produced. Different ferrous burden materials, for instance iron ore and scrap, can be used in various proportions in this steelmaking route. This paper analyses how energy use, conversion costs, and CO2 emissions can be influenced by the use of different ferrous burden materials when producing crude steel. An optimisation mixed integer linear programming (MILP) model has been applied for analysis. By the use of the optimisation model, it is possible to highlight some issues of special importance, such as best practices to increase production at low conversion cost, or best practices to increase production at low CO2 emission. It is found out that more benefits will be gained when using the system-oriented analysis to the steelmaking process. Furthermore, a comprehensive view of the trade-offs between the objectives of Cost and CO2 can provide useful information for decision makers to generate strategies under the future emission trading.

National Category
Energy Engineering
Research subject
Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-4902 (URN)10.1016/j.ijggc.2008.06.005 (DOI)000262914800005 ()2-s2.0-58149154939 (Scopus ID)2e69e420-735c-11dd-a60f-000ea68e967b (Local ID)2e69e420-735c-11dd-a60f-000ea68e967b (Archive number)2e69e420-735c-11dd-a60f-000ea68e967b (OAI)
Note
Validerad; 2009; 20080826 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-6311-1822

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