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The kinetics of the reactions involving coal is generally determined in laboratory using thermo-gravimetric analyzer (TGA) or drop tube furnace. These instruments suffer from the main limitation that they can handle only small sample sizes and therefore it becomes difficult to bring out the diffusion and conduction related limitations encountered by the large particles associated with the a processes...
In underground coal gasification (UCG), a cavity is formed in the coal seam due to consumption of coal. The irregular-shaped cavity consists of a spalled-rubble on the cavity floor, a cavity roof and a void zone between the two. Depending on the cavity growth pattern, UCG process can be divided into two distinct phases. In phase-I, coal/char near injection well gets consumed and cavity grows in a...
Underground Coal Gasification (UCG) is a process of gasifying coal in-situ to produce syn-gas. The gas thus produced, passes through the outflow channel that leads to the production well. As explained in part-I of this paper (Samdani et al., 2015), UCG can be divided in two distinct phases. The phase-I corresponds to initial vertical growth of the cavity and the output from phase-I model provides...
Underground Coal Gasification (UCG) is considered to be a clean coal technology primarily intended to utilize deep underground (>300m) coal deposits. In this process, a mixture of reactant gases like air/oxygen and steam are injected directly to an ignited portion of underground coal seam. UCG involves complex interactions of different processes like drying, pyrolysis, chemical reactions and spalling...
Underground Coal Gasification (UCG) process is studied through systematic laboratory scale experiments. Our earlier published work (Daggupati et al., 2011) demonstrated the various features of the Indian lignite coal in context of its applicability for UCG. In the present work, we study a hard Indian coal, with low volatile matter and moisture content. These results are compared with that of lignite...
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...
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