Method and apparatus for improving utilization of fuel values of as-mined coal in pulverized fuel-fired boilers
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United States of America Patent
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May 14, 1991
Grant Date -
N/A
app pub date -
Aug 25, 1989
filing date -
Aug 25, 1988
priority date (Note) -
Expired
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Abstract
Where as-mined coal or a washed coal derived therefrom is burned in a pulverized coal-fired boiler, improvements both in the utilization of the overall fuel values of the as-mined coal and in the operating efficiency of the boiler are obtained by installing a fluid bed combustor in the same combustion chamber as the pulverized fuel burner system of the boiler, and preferably below the burner system, and supplying as the fuel to the combustor a fuel comprising coal washery tailings preferably mixed with high ash solid washery residue.
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