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Wilhelmsson, Bodil
Alternative names
Publications (10 of 12) Show all publications
Sandström, K., Broström, M., Eriksson, M., Wilhelmsson, B., Viggh, E. & Backman, R. (2023). Modelling chemical phase evolution in counter-current reactors: a cement kiln application. In: : . Paper presented at Nordic Flame Days 2023, Trondheim, Norway, November 28 - 30, 2023.
Open this publication in new window or tab >>Modelling chemical phase evolution in counter-current reactors: a cement kiln application
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2023 (English)Conference paper, Oral presentation only (Other academic)
National Category
Chemical Engineering
Identifiers
urn:nbn:se:umu:diva-217394 (URN)
Conference
Nordic Flame Days 2023, Trondheim, Norway, November 28 - 30, 2023
Available from: 2023-12-01 Created: 2023-12-01 Last updated: 2024-07-12Bibliographically approved
Viggh, E., Boström, D. & Wilhelmsson, B. (2019). Raw meal and slag reactions during cement clinker formation. In: : . Paper presented at 15th International Congress on the Chemistry of Cement, Prague, Czech Republic, September 16–20, 2019.
Open this publication in new window or tab >>Raw meal and slag reactions during cement clinker formation
2019 (English)Conference paper, Oral presentation only (Other academic)
Abstract [en]

Natural limestones as raw material for OPC clinker manufacturing contribute to emissions of CO2gases during the production of clinker. In addition, the mining of limestone can regionally be controlledby restrictions due to environmental concerns. Slags from the steel industry can replace limestone tominimize the use of the mineral deposits. Both materials have similar chemistry and are compatible asraw materials.Utilizing slags raises questions about how slag particles will react with other raw meal components asthe temperature in the kiln increases during clinker formation. This study establishes the chemical andmineralogical aspects of replacing a portion of the limestone with slags. Of interest is how the materialsreact during the formation of the liquid phase and the formation of phases containing MgO.Three different slags were examined, a basic oxygen furnace slag BOF, a crystalline blast-furnace slagand a granulated blast-furnace slag. In the study, the microstructural causes of reactivity, as well asmineral formation in the transition zone between raw meal components, developing liquid phase andslag particles were studied. Heated raw meals were studied using HT-QXRD, QXRD, SEM andthermodynamic modeling to describe the reactions of particles at higher temperatures. The resultsshow that the formation of clinker minerals is strongly influenced by the type and amount of slag. Thus,a careful selection must be done of both composition and quantity of metallurgical slags for naturallimestone replacement in order to maintain clinker quality.

National Category
Chemical Engineering
Identifiers
urn:nbn:se:umu:diva-162764 (URN)
Conference
15th International Congress on the Chemistry of Cement, Prague, Czech Republic, September 16–20, 2019
Available from: 2019-08-28 Created: 2019-08-28 Last updated: 2023-08-21Bibliographically approved
Hökfors, B. & Backman, R. (2019). Reducing the CO2 footprint of cement production by electrification. In: : . Paper presented at 15th International Congress on the Chemistry of Cement Prague, Czech Republic, September 16–20, 2019.
Open this publication in new window or tab >>Reducing the CO2 footprint of cement production by electrification
2019 (English)Conference paper, Oral presentation only (Other academic)
Abstract [en]

Transformative actions in CO2 emitting industries are needed to reach the Paris climate agreement.The cement industry, which is responsible for 5-7% of the global CO2 emissions, has the possibility tomake a difference.Cement production is related to two sources of CO2; 1/3 from combustion of fuels and 2/3 fromcalcination of limestone in the cement raw meal. If all the fuels were to be substituted with non-fossilelectricity, the environmental gain would be significant. Cementa and Vattenfall are evaluatingpossibilities on how electricity can be used to substitute fuels in the cement production by 2030.By using electricity for heating, several positive effects are achieved in the production process. Thecleanness of the exhaust gas will be higher due to elimination of volatiles from fuels. The energyconsumption decreases due to lesser volume of gas to be heated. This is related to the exclusion ofnitrogen gas in the process.A feasibility study comprising literature survey and small scale tests have been performed. Electricalheating techniques showing potential are; microwave heating, plasma torches, flash calcination withelectrical heating, hydrogen combustion and a combination of the mentioned techniques.The most relevant finding is that the combustion related CO2 emissions will be eliminated; thecapturing step will be enhanced since the CO2 gas from calcination is clean and accordingly the needof storage or utilization of CO2 is decreased.

National Category
Chemical Engineering
Identifiers
urn:nbn:se:umu:diva-162787 (URN)
Conference
15th International Congress on the Chemistry of Cement Prague, Czech Republic, September 16–20, 2019
Available from: 2019-08-28 Created: 2019-08-28 Last updated: 2019-10-30Bibliographically approved
Hökfors, B., Boström, D., Viggh, E. & Backman, R. (2015). On the phase chemistry of Portland cement clinker. Advances in Cement Research, 27(1), 50-60
Open this publication in new window or tab >>On the phase chemistry of Portland cement clinker
2015 (English)In: Advances in Cement Research, ISSN 0951-7197, E-ISSN 1751-7605, Vol. 27, no 1, p. 50-60Article in journal (Refereed) Published
Abstract [en]

This paper describes the formation of a phosphorous belite solid solution and its impact on alite formation. A sub-solidus phase relation for the ternary system silicon dioxide–calcium oxide–phosphorus pentoxide (SiO2–CaO–P2O5) is reported. The ternary system is based on Rietveld refinements of X-ray diffraction patterns from experimental tests. The overall picture is based on known phase diagrams, relevant Rietveld refinements models, stoichiometric relationships as a function of increasing phosphorus pentoxide concentration and vacancy theories for solid solutions of phosphate belites. A tool is developed for predicting the chemistry of the product as well as the chemistry during heating when producing Portland cement clinker. A thermodynamic database for phase chemistry calculations of clinkering reactions has been created and evaluated. Suitable compounds and solution species have been selected from the thermochemical database included in FactSage software. Some solution compositions have been uniquely designed to allow for the proper prediction of the cement clinker chemistry. The calculated results from the developed database for heating raw materials in cement clinker production and cooling of the product are presented in this paper. The calculated results provide a good prediction of the phases and quantities formed during heating and non-equilibrium cooling. The prediction of the amounts of alite, belite and aluminoferrite phases in the product according to the Scheil method is good. The temperature interval for the existence of all of the major phases is relevant. The thermodynamic data for a solution phase of alite with substituting ions of primarily magnesium oxide and phosphorus pentoxide would improve the predictability of the developed database.

Place, publisher, year, edition, pages
Thomas Telford, 2015
National Category
Chemical Process Engineering
Identifiers
urn:nbn:se:umu:diva-89699 (URN)10.1680/adcr.13.00071 (DOI)000351286400007 ()2-s2.0-84937510640 (Scopus ID)
Available from: 2014-06-10 Created: 2014-06-10 Last updated: 2023-08-22Bibliographically approved
Hökfors, B., Viggh, E. & Eriksson, M. (2015). Simulation of oxy-fuel combustion in cement clinker manufacturing. Advances in Cement Research, 27(1), 42-49
Open this publication in new window or tab >>Simulation of oxy-fuel combustion in cement clinker manufacturing
2015 (English)In: Advances in Cement Research, ISSN 0951-7197, E-ISSN 1751-7605, Vol. 27, no 1, p. 42-49Article in journal (Refereed) Published
Abstract [en]

A thermodynamic process model is used as an evaluation tool. Full oxy-fuel combustion is evaluated for circulation of 20–80% of flue gases to the burn zone of a rotary kiln. The full oxy-fuel combustion simulations exhibit altered temperature profiles for the process. With 60% recirculation of flue gases, the temperature in the burn zone is comparable to the reference temperature, and carbon dioxide concentration in the flue gases increases from 33 to 76%. If water is excluded, carbon dioxide concentration is 90%. The partial oxy-fuel combustion method is evaluated for 20 and 40% recirculation of flue gases from one cyclone string to both calciners. Fuel and oxygen feed to the burning zone and calciners are optimised for the partial oxy-fuel scenario. The lowest specific energy consumption is desired while maximising the amount of carbon dioxide theoretically possible to capture. By introducing partial oxy-fuel combustion with 20% recirculation of flue gases in the carbon dioxide string, total carbon dioxide emissions increases by 4%, with 84% possible to capture. Within the limits of the model, the introduction of full oxy-fuel and partial oxyfuel combustion is possible while maintaining product quality. When simulating partial oxy-fuel combustion, the energy consumption will increase even when no power consumption for the production of oxygen is included.

Place, publisher, year, edition, pages
Thomas Telford: ICE Publishing, 2015
Keywords
cement clinker production, process modell, oxy-fuel combustion
National Category
Chemical Process Engineering
Identifiers
urn:nbn:se:umu:diva-86361 (URN)10.1680/adcr.13.00068 (DOI)000351286400006 ()2-s2.0-84937509423 (Scopus ID)
Available from: 2014-02-24 Created: 2014-02-24 Last updated: 2023-08-21Bibliographically approved
Hökfors, B. & Backman, R. (2015). Speciation of trace and minor elements in cement clinker production. In: 14th International Congress on the ­Chemistry of Cement 2015: . Paper presented at 14th International Congress on the Chemistry of Cement, Beijing, China, October 13-16, 2015.
Open this publication in new window or tab >>Speciation of trace and minor elements in cement clinker production
2015 (English)In: 14th International Congress on the ­Chemistry of Cement 2015, 2015Conference paper, Published paper (Refereed)
Abstract [en]

Trace and minor elements like arsenic (As), cadmium (Cd), cobalt (Co), chromium (Cr), copper (Cu), mercury (Hg), manganese (Mn), nickel (Ni), lead (Pb), antimony (Sb), thin (Sn), thallium (Tl), vanadium (V) and zinc (Zn) are important in cement clinker manufacturing. Even in low concentrations these elements influence the production processes, the quality of the products and the environment. The environmental issues are the volatility of elements at high temperatures to the atmosphere and the leachability of elements from concrete products to the surroundings. If a prediction tool was available of the fate of elements to the gas phase and to the cement clinker phases several advantages could be achieved. Therefore a calculation tool is developed based on thermodynamic equilibrium calculations with a two-step method. Most of the thermodynamic data are taken from the FactSageTM database 6.4 and the solutions phases are adjusted for cement clinker and similar applications.

The tool estimates the volatility of the elements at a temperature below onset of melt formation during production and after formation of melt. The results from the simulations are volatility of each element at low and high temperature and if the element is non-volatile it concentrates in the condensed phases.

In this article four sets of full scale industrial data from a cement clinker and a lime production plant are used to evaluate the prediction tool. The results comprise an inventory of the extent of thermodynamic data for selected trace and minor elements, thermodynamic calculations with distribution to gas or condensed phases with input from full scale measurements, the influence of oxidizing, less oxidizing and slight reducing conditions on the behavior of elements, results from full scale industrial measurements and a comparison between the calculated and the measured distribution of elements. For the cement clinker production eleven elements and for the lime production twelve elements are considered.

Keywords
trace elements; cement clinker production, thermodynamic simulation, industrial process data
National Category
Chemical Engineering
Identifiers
urn:nbn:se:umu:diva-162788 (URN)
Conference
14th International Congress on the Chemistry of Cement, Beijing, China, October 13-16, 2015
Available from: 2019-08-28 Created: 2019-08-28 Last updated: 2019-09-06Bibliographically approved
Eriksson, M., Hökfors, B. & Backman, R. (2015). The Effects of Oxygen Enrichment and Fuel Composition on Rotary Kiln Lime Production. Journal of engineering technology, 32(1), 30-43
Open this publication in new window or tab >>The Effects of Oxygen Enrichment and Fuel Composition on Rotary Kiln Lime Production
2015 (English)In: Journal of engineering technology, ISSN 0747-9964, Vol. 32, no 1, p. 30-43Article in journal (Refereed) Published
Abstract [en]

This article discusses the impact of oxygen (O2) enrichment on rotary kiln lump lime production. A predictive simulation tool is utilized to investigate the effect of O2 enrichment on the following key parameters of the lime process: kiln temperature profile, product quality, specific energy consumption and kiln production capacity. Three fuel mixes - 100% coal, 90% coal and 10% waste derived fuel oil, and 90% coal and 10% sawdust - are simulated at three oxygen levels. The oxygen levels represent three scenarios: no enrichment (21% O2), moderate enrichment (23% O2), and moderate-to-high enrichment (25% O2). This work is a part of the on-going efforts to reduce the environmental impact of industrial production. Reducing emissions, utilizing biofuels and waste derived fuels, full utilization of raw materials, and energy efficiency are areas of importance for industry. In the long term, oxyfuel technology, i.e., combustion with recirculated kiln gases and pure oxygen, could allow for near-zero emission production and carbon sequestration from industry and power production. In the short term, emission reductions in lime production must be achieved through other means, such as energy efficiency. As a step on the path to a near-zero emission lime plant, this paper describes an investigation of the influence of oxygen enrichment in rotary kiln lime production. The simulated results show positive effects of O2 enrichment, and the simulation results have been used by the kiln operator for in-house training. Results indicate that oxygen enrichment applied to lime production can reduce energy consumption and emissions.

Place, publisher, year, edition, pages
American Society for Engineering Education, 2015
National Category
Chemical Engineering Energy Engineering
Identifiers
urn:nbn:se:umu:diva-105273 (URN)000355062900004 ()
Funder
Swedish Energy Agency, 2006-06679Swedish Energy Agency, 30527-1
Available from: 2015-06-22 Created: 2015-06-22 Last updated: 2023-03-07Bibliographically approved
Hökfors, B., Eriksson, M. & Viggh, E. (2014). Modelling the cement process and cement clinker quality. Advances in Cement Research, 26(6), 311-318
Open this publication in new window or tab >>Modelling the cement process and cement clinker quality
2014 (English)In: Advances in Cement Research, ISSN 0951-7197, E-ISSN 1751-7605, Vol. 26, no 6, p. 311-318Article in journal (Refereed) Published
Abstract [en]

This paper presents a recently developed simulation model that can be used as a tool for evaluating sustainable development measures for cement and lime production processes. Examples of such measures are introducing new combustion technologies such as oxy-fuel combustion, using biomass fuel and using alternative materials in the raw material feed. One major issue when introducing process changes is the need to maintain product quality. In some ways, oxygen-enriched air combustion resembles oxy-fuel combustion. The model results were validated and found to be consistent with full-scale operational data for normal running conditions and for a full-scale test with oxygenenriched air. The model shows, for example, that with an additional 1500 m3/h of oxygen, fuel addition at the calciners can increase up to 108% and the raw material feed rate can increase up to 116% for a process with a raw meal feed of 335.5 t/h.

Place, publisher, year, edition, pages
ICE Publishing, 2014
National Category
Chemical Process Engineering
Identifiers
urn:nbn:se:umu:diva-86000 (URN)10.1680/adcr.13.00050 (DOI)000344814500002 ()2-s2.0-84912523333 (Scopus ID)
Funder
Bio4EnergySwedish Energy Agency, 30527-1
Available from: 2014-02-14 Created: 2014-02-14 Last updated: 2023-03-24Bibliographically approved
Eriksson, M., Hökfors, B. & Backman, R. (2014). Oxyfuel combustion in rotary kiln lime production. Energy Science & Engineering, 2(4), 204-215
Open this publication in new window or tab >>Oxyfuel combustion in rotary kiln lime production
2014 (English)In: Energy Science & Engineering, ISSN 2050-0505, Vol. 2, no 4, p. 204-215Article in journal (Refereed) Published
Abstract [en]

The purpose of this article is to study the impact of oxyfuel combustion applied to a rotary kiln producing lime. Aspects of interest are product quality, energy efficiency, stack gas composition, carbon dioxide emissions, and possible benefits related to carbon dioxide capture. The method used is based on multicomponent chemical equilibrium calculations to predict process conditions. A generic model of a rotary kiln for lime production was validated against operational data and literature. This predicting simulation tool is used to calculate chemical compositions for different recirculation cases. The results show that an oxyfuel process could produce a high-quality lime product. The new process would operate at a lower specific energy consumption thus having also a reduced specific carbon dioxide emission per ton of product ratio. Through some processing, the stack gas from the new process could be suitable for carbon dioxide transport and storage or utilization. The main conclusion of this paper is that lime production with an oxyfuel process is feasible but still needs further study.

Place, publisher, year, edition, pages
Wiley-Blackwell, 2014
Keywords
Carbon capture and storage, energy efficiency, lime, oxyfuel
National Category
Chemical Engineering
Identifiers
urn:nbn:se:umu:diva-111578 (URN)10.1002/ese3.40 (DOI)000209695600005 ()2-s2.0-84994758222 (Scopus ID)
Available from: 2015-11-17 Created: 2015-11-17 Last updated: 2023-03-24Bibliographically approved
Hökfors, B. (2014). Phase chemistry in process models for cement clinker and lime production. (Doctoral dissertation). Umeå: Umeå Universitet
Open this publication in new window or tab >>Phase chemistry in process models for cement clinker and lime production
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The goal of the thesis is to evaluate if developed phase chemical process models for cement clinker and lime production processes are reliable to use as predictive tools in understanding the changes when introducing sustainability measures.

The thesis describes the development of process simulation models in the application of sustainability measures as well as the evaluation of these models. The motivation for developing these types of models arises from the need to predict the chemical and the process changes in the production process, the impact on the product quality and the emissions from the flue gas.

The main chemical reactions involving the major elements (calcium, silicon, aluminium and iron) are relatively well known. As for the minor elements, such as sodium and potassium metals, sulphur, chlorine, phosphorus and other trace elements, their influence on the main reactions and the formation of clinker minerals is not entirely known. When the concentrations of minor and trace elements increase due to the use of alternative materials and fuels, a model that can accurately predict their chemistry is invaluable. For example, the shift towards using less carbon intensive fuels and more biomass fuels often leads to an increased phosphorus concentration in the products.

One way to commit to sustainable development methods in cement clinker and lime production is to use new combustion technologies, which increase the ability to capture carbon dioxide. Introducing oxy-fuel combustion achieves this, but at the same time, the overall process changes in many other ways. Some of these changes are evaluated by the models in this work.

In this thesis, a combination of the software programs Aspen Plus™ and ChemApp™ constitutes the simulation model. Thermodynamic data from FACT are evaluated and adjusted to suit the chemistry of cement clinker and lime.

The resulting model has been verified for one lime and two cement industrial processes.

Simulated scenarios of co-combustion involving different fuels and different oxy-fuel combustion cases in both cement clinker and lime rotary kiln production are described as well as the influence of greater amounts of phosphorus on the cement clinker quality.

Place, publisher, year, edition, pages
Umeå: Umeå Universitet, 2014. p. 67
Keywords
Process modelling, phase chemistry, cement clinker, lime, sustainability, CO2, energy
National Category
Chemical Process Engineering
Identifiers
urn:nbn:se:umu:diva-86004 (URN)978-91-7459-801-8 (ISBN)
Public defence
2014-03-14, N420, Naturvetarhuset, Umeå, 13:00 (Swedish)
Opponent
Supervisors
Funder
Swedish Energy Agency, 30527-1Bio4Energy
Available from: 2014-02-21 Created: 2014-02-14 Last updated: 2018-06-08Bibliographically approved
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