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A predictive chemistry model for the cement process
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics. (Thermal Energy Conversion Laboratory)
Cementa AB, Limhamn, Sweden.
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics. (ETPC)
2008 (English)In: Zement, Kalk, Gips International: ZKG international, ISSN 0949-0205, Vol. 61, no 7, 60-70 p.Article in journal (Other academic) Published
Abstract [en]

A tool has been developed that enables prediction of the chemistry in cement production with thermodynamic phase equilibrium calculations. Reactions in gas, solid and liquid phases are calculated in the process from preheating tower, including exhaust gas cleaning, through rotary kiln, clinker cooler and ends at the output of clinker. The simulated values are compared to measured or calculated data from a full scale plant. This is a cement plant producing 2000 t clinker per day using both traditional and alternative fuels. The chemistry model shows good agreement especially on material chemistry at various places in the process and on composition of the clinker. A new way to define fuels is used and is straightforward and reliable. In the future work the model has to be improved and more elements are to be added to the thermodynamic database.

Place, publisher, year, edition, pages
Gutersloh, Germany: Bauverlag BV , 2008. Vol. 61, no 7, 60-70 p.
Keyword [en]
Kiln, process model, cement clinker
National Category
Chemical Process Engineering
Identifiers
URN: urn:nbn:se:umu:diva-85998OAI: oai:DiVA.org:umu-85998DiVA: diva2:696502
Funder
Swedish Energy Agency
Available from: 2014-02-14 Created: 2014-02-14 Last updated: 2017-12-06Bibliographically approved
In thesis
1. Phase chemistry in process models for cement clinker and lime production
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. 67 p.
Keyword
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: 2014-02-24Bibliographically approved

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