Abstract
Formation mechanisms of N2O and NO have been experimentally investigated using a temperature-controlled one-dimensional laminar-flow pulverized coal combustion furnace. The temperature range is 800-1100°C including that of usual fluidized bed combustion. The effect of temperature and the separated contribution of Volatile-N and Char-N are clarified using raw coals and their chars carbonized in an actual bubbling fluidized bed combustor. N2O formation and destruction reactions strongly depend on temperature, and N2O almost disappears with the inclease of temperature above 1100°C. The conversion ratios of Volatile-N to N2O and NO are higher than those of Char-N. While the Fast Volatile-N released at the early stage of combustion process is mainly converted to NO, the Slow Valatile-N released at the char combustion stage is selectively converted to N2O.
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