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Laboratory studies on combustion cavity growth in lignite coal blocks in the context of underground coal gasification

Authors :
Daggupati, Sateesh
Mandapati, Ramesh N.
Mahajani, Sanjay M.
Ganesh, Anuradda
Mathur, D.K.
Sharma, R.K.
Aghalayam, Preeti
Source :
Energy. Jun2010, Vol. 35 Issue 6, p2374-2386. 13p.
Publication Year :
2010

Abstract

Abstract: Cavity formation is an important phenomenon in the underground coal gasification (UCG) process. In the early stages of cavity formation, only the combustion reaction is performed in order to stabilize the temperature field. In the present work, we study the formation of the combustion cavity and the effect of various design and operating parameters such as the distance between the wells, feed flow rate and operation time, on its evolution. This paper presents details of laboratory-scale experiments that demonstrate the shape and size of the combustion cavity, and their dependence on various parameters. Empirical correlations for the cavity volume and dimensions in various directions are developed, which indicate the strong effects of mass transport. Results from computational fluid dynamics (CFD), which map the velocity profiles in the cavity, support the experimental observations. [Copyright &y& Elsevier]

Details

Language :
English
ISSN :
03605442
Volume :
35
Issue :
6
Database :
Academic Search Index
Journal :
Energy
Publication Type :
Academic Journal
Accession number :
50372080
Full Text :
https://doi.org/10.1016/j.energy.2010.02.015