Coal is gasified underground by drilling boreholes from the surface into the coal seam, creating a linkage through the coal seam between the injection and production wells and injecting air (or oxygen) and water (or steam) into the underground reaction zone. In the process, the coal is partially oxidized, producing low and medium Btu gas. If only air is injected, the produced gases contain a high percentage of Nitrogen and have a heating value roughly one-tenth of natural gas, named as low-Btu gas.
Underground coal gasification gives many details about underground coal.
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