238 K-ECO ストーカの開発

抄録

Low air ratio combustion, one of the most important technologies in "the Next Generation Stoker Incinerator" was studied in two MSW incineration plants. In plant "A" with a capacity of 130t/24h, air ratio was reduced to 1.37 at the economizer outlet by optimization of combustion control. Higher exhaust gas temperature due to the low air ratio realized a low dioxins level of 0.00056ngTEQ/m^3_N at the stack inlet with a negligible CO increase. In plant "B" with a capacity of 50t/24h, a low air ratio of 1.35 enabled 20% exhaust gas reduction using FGR (Flue Gas Recirculation). As the exhaust temperature was kept the same as conventional operations in this test, dioxins level was also unchanged. However remarkable improvement was obtained in NOx concentration with a reduction of 45% compared with conventional operations.