The NO and N_2O Formation Mechanism During Devoplatilization and Char Combustion Under Fluidized-Bed Conditions

摘要

In an exclusively electrically heated, laboratory-scale, fluidized-bed combustor (MM-FBC) made of quartz glass, the formation rates of NO, N_2O, and HCN are studied by using a high performance FT-IR spectrometer in combination with a long-path, low-volume gas cell. The emission characteristics of single, spherical fuel particles (5-15 mm in diameter) of bituminous coal, subbituminous coal, and beech wood are studied. The bed temperature is varied between 600 and 900 deg C. The fluidizing velocity is 0.68 m/s and the oxygen partial pressure is varied between 0.05 and 21 kPa. The bed material is silica sand with a mean diameter of 225 umm.