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Laboratory studies on cavity growth and product gas composition in the context of underground coal gasification

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Title Laboratory studies on cavity growth and product gas composition in the context of underground coal gasification
 
Creator DAGGUPATI, S
MANDAPATI, RN
MAHAJANI, SM
GANESH, A
SAPRU, RK
SHARMA, RK
AGHALAYAM, P
 
Subject MODEL
UCG
UCG
Syngas
Cavity
Calorific value
 
Description Systematic laboratory scale experiments on coal blocks can provide significant insight into the underground coal gasification (UCG) process. Our earlier work has demonstrated the various features of the early UCG cavity shape and rate of growth through lab-scale experiments on coal combustion, wherein the feed gas is oxygen. In this paper, we study the feasibility of in situ gasification of coal in a similar laboratory scale reactor set-up, under conditions relevant for field practice of UCG, using an oxygen-steam mixture as the feed gas. By performing the gasification reaction in a cyclic manner, we have been able to obtain a product gas with hydrogen concentrations as high as 39% and a calorific value of 178 kJ/mol. The effect of various operating parameters such as feed temperature, feed steam to oxygen ratio, initial combustion time and so on, on the product gas composition is studied and the optimum operating conditions in order to achieve desired conversion to syngas, are determined. We also study the effect of various design and operating parameters on the evolution of the gasification cavity. Empirical correlations are proposed for the change in cavity volume and its dimensions in various directions. The results of the previous study on the combustion cavity evolution are compared with this gasification study. (C) 2011 Elsevier Ltd. All rights reserved.
 
Publisher PERGAMON-ELSEVIER SCIENCE LTD
 
Date 2012-06-26T06:38:52Z
2012-06-26T06:38:52Z
2011
 
Type Article
 
Identifier ENERGY,36(3)1776-1784
0360-5442
http://dx.doi.org/10.1016/j.energy.2010.12.051
http://dspace.library.iitb.ac.in/jspui/handle/100/14058
 
Language English