Non‐Isothermal Degradation Kinetics of CaCO<sub>3</sub> from Different Origin

Georgieva, Velyana G.; Vlaev, L. T.; Gyurova, K.

doi:10.1155/2013/872981

Cited by 56 publications

(47 citation statements)

References 38 publications

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“…The proposed numerical model accounts for gas flow via an open source CFD code, heat and mass transfer with particles and a 1D conductive-diffusive model for heat and mass transport inside each single particle. Predictions are validated with the experimental data documented by Gieorgieva et al [5], where conduction with the solid walls plays a major role in the process.…”

Section: Introductionsupporting

confidence: 55%

“…The setup is the one used by Gieorgieva [5] in his experimental tests. In [5] small samples of CaCO 3 of about 5 ± 0.1 mg were loaded without pressing into an open 6 mm diameter and 3 mm high platinum crucible.…”

Section: Predicted Resultsmentioning

confidence: 99%

“…The equations constituting the model are deduced from those used for a laminar flow (this assumption is justified by the conditions of the present setup, with a Reynolds Number ranging between 5.032 and 5.832 [5]). …”

Section: Modeling Fluid Flow In Porous Mediamentioning

confidence: 99%

“…CaCO 3 calcining has been extensively studied [5]. According to the results obtained by different authors the apparent magnitude of the Arrhenius parameters range from 110 to 3800 kJ/mol for the activation energy, and from 10 2 to 10 157 S −1 for the frequency factor.…”

Section: Introductionmentioning

confidence: 99%

“…According to the results obtained by different authors the apparent magnitude of the Arrhenius parameters range from 110 to 3800 kJ/mol for the activation energy, and from 10 2 to 10 157 S −1 for the frequency factor. Gieorgieva [5] concludes that wide variations in the values can be ascribed to the shape of the crystalline phase, the mean size of the particles, the sample mass, isothermal or non-isothermal heating, the heating rate, the static or dynamic atmosphere around the sample, the furnace atmosphere, the partial pressure of carbon dioxide, and the particular calculation procedure adopted.…”

Section: Introductionmentioning

confidence: 99%

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A discrete-continuous approach to describe CaCO3 decarbonation in non-steady thermal conditions

et al. 2015

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In cement production, direct measurements of thermal and chemical variables are often unfeasible as a consequence of aggressive environments, moving parts and physical inaccessibility, and therefore prediction models are essential tools in these types of industrial applications. This article addresses the problem of the numerical prediction of the CaCO 3 calcination process, which is the first and the most energy expensive process in clinker production. This study was conducted using the Extended Discrete Element Method (XDEM), a framework which allows a Eulerian approach for the gas phase to be combined with a Lagrange one for the powder phase. A detailed validation of the numerical model was performed by comparison to non-isothermal TG curves for mass loss during the CaCO 3 decarbonation process. The complex three-dimensional predictions for solid and gas phases are believed to represent a first step towards a new insight into the cement production process. Thus, the high accuracy and detailed description of the problem addressed, serve as a basis to assess the uncertainty of more simplified models such as those used in soft sensors.

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Section: Introductionsupporting

confidence: 55%

Section: Predicted Resultsmentioning

confidence: 99%

Section: Modeling Fluid Flow In Porous Mediamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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