Method for controlling H.sub.2 /CO ratio of in-situ coal gasification product gas
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United States of America Patent
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Oct 16, 1984
Grant Date -
N/A
app pub date -
Mar 31, 1982
filing date -
Mar 31, 1982
priority date (Note) -
Expired
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Abstract
A method for in-situ coal gasification to recover a product gas having a predetermined H.sub.2 /CO ratio by introducing controlled amounts of carbon dioxide recovered from the product gas along with steam and oxygen injected into the coal deposits. The H.sub.2 /CO ratio of the product gas is preferably maintained within the range of 1.5 to 4.0.
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