超低NO_Xバーナによる微粉炭燃焼場の数値シミュレーション : 瀝青炭使用時の石炭性状が燃焼特性に与える影響検討(FP2 燃料多様化・環境技術1)

概要

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A three-dimensional numerical simulation is applied to a pulverized coal combustion field in a test furnace equipped with an advanced low NO_X burner called CI-α burner. The applicability of the numerical simulation to the prediction of NO_X concentration in exhaust gas and combustion efficiency for bituminous coals is investigated, and their results are compared with experimental results. The results show that the present numerical simulation is generally applicable for the bituminous coals. The accuracy of the numerical simulation is improved by faithfully duplicating the configuration of the burner, and by using this detailed model it can be verified that a recirculation flow is formed in the high- gas-temperature region near CI-α burner outlet, and this lengthens the residence time of coal particles in this high-temperature region, promotes the evolution of volatile matter and the progress of char reaction, and produces an extremely low-O_2 region for effective Nox reduction.
社団法人日本機械学会の論文
2004-06-22