| 摘要 |
PURPOSE:To remove N2O in a combustion gas effectively by filling gamma-alumina or a mixture of gamma-alumina and a metal compound as a bed material of a fluidized bed. CONSTITUTION:A small-sized bubbling fluidized bed combustion furnace is constructed of a quartz tube 11 and silica sand, a bed material, is filled on a porous plate 12 provided in the lower part of the tube. The bed material is fluidized by supplying air from an air supply pipe 13 provided at the lower part of the quartz tube 11, and thereby a fluidized bed 14 is formed. Quartz, a fuel, is supplied continuously from a fuel supply pipe 15 and combusted by a heater 16 provided in the outer peripheral part of the quartz tube 11 (the temperature in the fluidized bed 14 is measured by a thermocouple 17). At the same time, gamma-alumina is supplied continuously into a free board part 19 of the quartz tube 11 from a reagent supply pipe 18 inserted from the top of the quartz tube 11. A gas after combustion is exhausted from a gas exhaust pipe 20 provided at the top of the quartz tube 11. By the above-stated construction, N2O is decomposed completely and an N2O removal rate of 100% can be attained. |
