Int. J. of Oil, Gas and Coal Technology   »   2016 Vol.12, No.4

 

 

Title: The coal-gas system - the effective diffusion coefficient

 

Authors: Norbert Skoczylas; Juliusz Topolnicki

 

Addresses:
Strata Mechanics Research Institute of The Polish Academy of Sciences, ul. Reymonta 27, 30-059 Krakow, Poland
Strata Mechanics Research Institute of The Polish Academy of Sciences, ul. Reymonta 27, 30-059 Krakow, Poland

 

Abstract: In this paper issues concerning the evaluation of the kinetics of gas release from coal samples were systematised. Our own analytical solution was presented. Diffusion equation was solved numerically. The numerical solution of Fick's formula taking into account of the Langmuir isotherm was compared with the analytical solution based on the Henry isotherm. For the initial range of pressure values, where Langmuir and Henry isotherms were similar, the differences were relatively minor. However, they become significant for the higher pressure values. [Received: January 8, 2015; Accepted: March 4, 2015]

 

Keywords: coal-gas systems; gas diffusion; Fick's law; sorption isotherms; effective diffusion coefficient; gas release kinetics; pressure values; coal mining.

 

DOI: 10.1504/IJOGCT.2016.077300

 

Int. J. of Oil, Gas and Coal Technology, 2016 Vol.12, No.4, pp.412 - 424

 

Available online: 24 Jun 2016

 

 

Editors Full text accessAccess for SubscribersPurchase this articleComment on this article