Method and apparatus for calcining limestone using coal combustion for heating
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United States of America Patent
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May 24, 1988
Grant Date -
N/A
app pub date -
Jun 22, 1987
filing date -
Jun 22, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus for calcining limestone to produce lime wherein coal is combusted to provide heat for the calcination. The coal is combusted in a two stage combustion unit, with at least seventy-five percent of the slag formed by the coal combustion removed from the first stage of the combustion unit. Residual gases and fuel are further combusted in the second stage of the two stage combustor, with hot combustion gases therefrom, having the molten slag removed, fed directly to the calcining chamber of a rotary lime kiln. The coal may be carbonized to form a char and a fuel gas for use in the two stage combustor.
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