Abstract
Seven coals of varying rank were tested in an experimental mass-burning simulation to assess general nitric oxide (NO) emission characteristics. Comparisons were made among the fuels to ascertain a relationship between nitric oxide emissions, fuel nitrogen content, nitrogen volatility and firing conditions. Considerable variability in exhaust NO emissions was observed among coal types, even for coals of common rank fired under similar thermal and stoichiometric conditions. Fuel nitrogen conversion to NO was not singularly dependent on inherent nitrogen content or volatility. A correlation was developed to estimate NO emissions based on both coal nitrogen content and char nitrogen fraction for combustion conditions typical of massburning stokers.
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