| 摘要 |
PURPOSE:To restrain the generation of nitric oxide in such a way that at the same time as fuel is made partial combustion by air ratio not to produce NOx, SO2, it is desulfurized, which is burned after second stage by air ratio which is exceedingly little in the generation of NOx. CONSTITUTION:Though fuel such as coal, etc. is fed into a fluidized bed 1 at the first stage as shown by an arrow 4, since air is by far less than theorematic air gain to allow perfect combustion, fuel is gasified. In this case, engendered H2S is desulfurized to be CaS in reaction with fluidic medium CaO, and CaS is exhausted by way of an arrow 5. Then combustible gas together with HCN, etc. ascend to be fed into a fluidized bed 10 at the second stage. Since failure is found for the perfact combustion in case with the air fed from an arrow 12 into the fluidized bed 10 at the second stage, it is fed also from arrows 13, 14, so that HCN, etc. are held at temperature as well as air ratio which engenders only a little NOx, which is fully decomposed to be innoxious. Thus, the generation of nitric oxide is restrained. |
