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川崎製鉄技報
KAWASAKI STEEL GIHO
Vol.10 (1978) No.4
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焼結過程のNOxの生成と燃料中窒素濃度,焼結条件の影響
Generation of Nitrogen Oxide during Iron Ore Sintering and Effect of Nitrogen Concentration in Fuel and Sintering Condition

佐々木  晃(Akira Sasaki) 斉藤 健志(Kenji Saito) 町島 良一(Ryoichi Machishima) 岡部 侠児(Kyoji Okabe)
要旨 :
焼結過程のNOxの生成機構および燃料中窒素濃度や焼結条件のNOx生成への影響を検討した。(1)焼結過程で生成するNOxはほとんど燃料中の窒素に起因する。(2)NOxは燃焼帯上部の酸化帯で生成し還元帯で減少する。(3)NOx生成量は燃料中窒素濃度に依存するが,さらに燃焼帯のガス雰囲気によっても支配される。燃料の種類,燃料添加量,吸引風量や燃料粒度を変えた焼結鍋試験を行うと,NO転換率は燃焼に関与しなかった未反応酸素量と密接な関係がある。
Synopsis :
Studies have been made of the mechanism of generation of nitrogen oxide (NOx) in iron ore sintering process, and the effect of fuel and sintering conditions on NOx generation. The results are summarized as follows: (1) It is confirmed that NOx in sintering process originates mainly from nitrogen in fuel. (2) NOx is formed in the oxidizing part of combustion zone and then diminishes in the reducing part. (3) Generation of NOx increases with nitrogen content in coke and is also affected by gas composition of combustion zone. The conversion ratio of in-fuel nitrogen to NO is closely related to residual oxygen content in exhaust gas of sintering according to sintering tests where factors such as fuel (type, particle size, and amount added) and suction air flow rate are varied.
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