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Lookup NU author(s): Dr Vasilis SarhosisORCiD
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND).
Underground coal gasification (UCG) is an efficient method for the conversion of the deep coal resources into energy. This paper is concerned with a feasibility study of the potential of deeply lying coal seams (>1200 m) for the application of UCG combined with subsequent storage of CO2 for a site located in Bulgaria. A thermal–mechanical coupled model was developed using the ABAQUS software package to predict the heat transfer, the stress distributions around the UCG and the consequent surface subsidence. Material properties of rocks and coal were obtained from existing literature and geomechanical tests which were carried out on samples derived from the demonstration site in Bulgaria. Three days of gasification has been simulated by assigning a moving heat flux on a cell of 2 m × 2 m × 2 m at a velocity of 2 m/day. Results of temperature and stress distribution showed that the developed numerical model was able to simulate the heat propagation and the stress distribution around cavities under a thermal–mechanical coupled loading during the UCG process. Also, the surface subsidence was found to be 0.08 mm after three days of gasification for the case studied. It is anticipated that the results of this paper can be used for the prediction and optimization of the UCG process in deep coal seams.
Author(s): Yang D, Sarhosis V, Sheng Y
Publication type: Article
Publication status: Published
Journal: Journal of the Energy Institute
Year: 2014
Volume: 87
Issue: 4
Pages: 321-329
Print publication date: 01/11/2014
Online publication date: 02/04/2014
Acceptance date: 21/05/2013
Date deposited: 17/02/2016
ISSN (print): 1743-9671
ISSN (electronic): 1746-0220
Publisher: Elsevier
URL: http://dx.doi.org/10.1016/j.joei.2014.03.029
DOI: 10.1016/j.joei.2014.03.029
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