研究室規模の加圧流動層燃焼炉による下水汚泥の排ガス特性に及ぼす圧力の影響

抄録

Annual production of sewage sludge in Japan increased to 2.17 million tons (d.b.) in 2004. About 70% of sewage sludge is incinerated. The nitrogen content of the sludge is considerably higher than that of other fuels, such as coal and wood. Thus the emissions of NO_x and N₂O are anticipated to be high. Our previous studies have been reported the proposed fluidized bed incinerator with the turbocharger (FBIT), which is a new type of incineration plant consisting of a pressurized fluidized bed combustor coupled with a turbocharger, can achieve not only energy recovery but also a low environmental impact. The objectives of this work were to clarify the effect of wide range of operating pressure on flue gas characteristics in a laboratory-scale pressurized fluidized bed combustor (PFBC). As the results, CO and NO_x emissions depend on the pressure in the combustor, and these emissions decreased with increasing operating pressure. N₂O emission was strongly depended on the freeboard temperature in the combustor.