Abstract
Combustion experiments on various kinds of coal were conducted by means of an experimental apparatus for circulating fluidized bed combustion to evaluate the characteristics of circulating fluidized bed combustion. The results showed that NOx emissions can be decreased (to about 50 ppm, depending on the kind of coal) with a high combustion efficiency being maintained by a combination of fly ash recycling and two-stage combustion. Fly ash recycling alone was highly effective in decreasing NOx with some kinds of coal. It was also found that both low NOx emissions and high sulfur capture efficiency in the combustor due to the addition of limestone are achieved at the same time.
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