A Study on the Effect of Fluidizing Media on the N2O Production in Fluidized Bed Incineration of Sewage Sludge

: This study was performed to investigate the effects of fluidizing media on N 2 O production in fluidized bed incineration of sewage sludge. The fluidized media were prepared in a form of 2 mm bead by mixing zeolite powders in our lab. Sand having 0.4 mm of the mean size showed 0.44 m/s of minimum fluidization velocity (U mf ), while the prepared zeolite media 0.5 m/s. When the ratio of fluidizing media height to the inside diameter of the incinerator (bed aspect ratio) increased from 1.4 to 3.1, it was found that U mf of the zeolite media was varied from 0.5 m/s to 0.7 m/s. Under the operation conditions in 1.79 of excess air ratio, 909 ℃ of bed temperature and ca. 1.65 m/s of superficial velocity, as the weight of fluidizing meadia was increased, O 2 con-centration in the flue gas was slightly decreased, and CO 2 increased. Above 6 kg of fluidizing media weight (1.98 of bed aspect ratio), it was observed that N 2 O concentration was significantly reduced, which might result from the decomposition of N