Method for Stimulating Underground Coal Gasification
A. Sadovenko, A. V. Inkin
National Mining University of Ukraine, Dnipro, 49600 Ukraine
Keywords: Подземная газификация угля, тепловой поток, водоносный горизонт, нагретые воды, Underground coal gasification, heat flow, aquifer, heated water
Abstract
The mathematical model of heat flow and transfer in roof rocks of underground gas gasifier during coal gasification is developed and tested. In terms of geological conditions in the Olkhovo-Nizhnee site (industrial region in Donbass), in Mathcad environment, convective and conductive components of heat flow from reaction channel to upper-lying aquifer are determined. The change in the heat flow from the reaction channel and in the ground water temperature is estimated depending on impermeable layer thickness and water well yield. It is found that after underground coal gasification, water-bearing sandstones accumulate more than 60% of heat migrating from gasifier to enclosing rock mass. It is shown that withdrawal and use of water heated during underground coal gasification will enhance efficiency of the process by 18-25% subject to thickness of partition layer.
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