Abstract
A relationship was developed between the retorting gas flow rate and the velocity of the deflagration wave which is applicable to maintaining a separation between the pyrolysis zone and the combustion zone in the advancing thermal wave which would assure the use of residual carbon rather than volatile material as fuel in underground retorting. The analysis shows that, for stable, steady-state combustion and pyrolysis wave, the ''height of a gas transfer unit'', R, should be < 1, but that for the required large value of ''1'', the pyrolysis zone thickness, R should approach unity. Published U.S. Bureau of Mines data from 150 ton retorting tests confirm the analysis.
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