The Underground Coal Gasification is a fossil fuel technology, and as such must address concerns over global warming. The raw εUCG gas contains CO2 in concentrations that vary depending on process conditions and the choice of oxidant. The gas is produced under pressure and at a moderate temperature, and easily lends itself to CO2 removal by a range of standard methods, with low energy penalty and at a relatively low cost. So captured and removed, CO2 can be permanently stored (or sequestered) in the underground storage zones created by coal extraction in the εUCG operations. The energy penalty and relative cost of CO2 re-compression and sequestering are comparatively low.
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