| 摘要 |
PURPOSE:To denitrate a combustion product with high efficiency, by a method wherein a bluff-body in a specified shape is formed at the forward end of a pulverized coal pipe, and this prevents dispersion of pulverized coal, and forms an excellent reduction flame in the vicinity of the nozzle of the pulverized coal pipe. CONSTITUTION:Pulverized coal, forming a pulverized coal flow 2, is injected through a nozzle 9 into a furnace by means of a pulverized coal pipe 8. In which case, a vortex flow 24 is produced to the inside of a L-shaped part of an L- shaped bluff-body member 20 formed in an L-shaped in cross section with the aid of the member. The vortex flow serves to prevent the pulverized coal flow from being dispersed to the outside of the L-shaped part, and enables relatively excellent reduction of a gas phase. Further, a fan, which independently feeds a secondary and a tertiary air, is installed, dampers 30 and 32, air registers 12 and 14 for the secondary and the tertiary air, and secondary and tertiary air vanes 16 and 16A, serving as a terminal swirl device, are provided, and this controls the pressure and the air flow of each air and produces a swirl force, resulting in the possibility to excellently separate the secondary and the tertiary air from a high-temperature reduction flame 1.
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