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Reducing CO2 emissions in cement industry – the calcination model

The cement industry is one of the leading producers of the greenhouse gases, where carbon dioxide is the most significant anthropogenic greenhouse gas. There are two thermo-chemical processes involved in cement production which contribute to these emissions. One is the thermal decomposition of limestone, widely known as the calcination process, and the other is the combustion of fossil fuels. Recently, researchers have invested significant effort to improve the energy consumption and pollutant formation of the overall cement manufacturing process. One of these improvements was made by dividing the calcination and clinkering process into two separate furnaces, where the calcination process is performed in a furnace called a calciner, and the clinkering process is performed in a rotary kiln. Because this is a new technology in the cement manufacturing process, cement calciners are still in the research and development phase. The purpose of this paper is to present the first phase of the cement calciner's development, which is the CFD simulation of the cement calciner, with an implemented mathematical model of the calcination process. From the results gained by these simulations, researchers will have an in-depth understanding of all thermo-chemical reactions in a cement calciner. This understanding can be used for the optimization of the calciner's geometry, to have a more efficient production, to lower the pollutant formation and subsequently reduce greenhouse gases emission.

Calcination process; Cement calciner; CFD; Cement production; Fuel efficiency

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