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Journal of Thermal Analysis and Calorimetry

, Volume 95, Issue 1, pp 285–292 | Cite as

The isokinetic effect as related to the activation energy for the gases diffusion in coal at ambient temperatures

Part I. Fick’s diffusion parameter estimated from kinetic curves
  • A. Mianowski
  • Aleksandra Marecka
Article

Abstract

The present paper contains theoretical analysis and a thorough discussion of the applicability of Fick’s approach to modelling CO2 and CH4 diffusion in heterogeneous coal, especially with regard to the estimation of a single diffusion coefficient from the dependence defined by a number series. The computations were performed for high rank coal depending on the grain size of coal samples and within a narrow range of temperature − 293 and 303 K.

The results of the model’s application to the experimental data show that the method of estimation of the diffusion coefficient is very important. Our results also show that the diffusion coefficient changes are closely related with the one-parameter analysis of coal grain size distribution.

It was shown that for the investigated grain size distribution the diffusion coefficient as expressed by Fick’s law may only be determined as a value which is directly proportional to the diffusion parameter. Hence, the estimation of D/r 2 is recommended.

Keywords

coal diffusion coefficient Fick’s II law gases sorption 

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Copyright information

© Springer Science+Business Media, LLC. 2009

Authors and Affiliations

  1. 1.Department of Inorganic Chemistry and TechnologySilesian Technical UniversityGliwicePoland
  2. 2.Faculty of Fuels and EnergyAGH — University of Science and TechnologyCracowPoland

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