Hazard Control of NO_x in Hot Stove

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• 作者：Chuan CHEN^a ; ^{chenchuan606@163.com" class="auth_mail}Author Vitae ; Shu-sen CHENG^a ; Xi-bin GUO^b
• 关键词：hot stove ; hazard control ; NOx emission ; liquid water formation
• 刊名：Journal of Iron and Steel Research, International
• 出版年：March, 2014
• 年：2014
• 卷：21
• 期：3
• 页码：306-311
• 全文大小：486 K

文摘

Hazard control of NO_x is very important for the long life of hot stove shell and environmental protection. NO_x concentrations during different operation periods of hot stove were calculated according to thermodynamical and dynamical analyses. The results were verified by the previously measured data. Then, the influence of hot stove operation parameters on NO_x concentration and the mechanism of liquid water formation in hot stove were studied. The results indicated that in gas period, the dome temperature should be controlled below 1420 掳C in order to decrease NO_x emission. In the case of banking operation, NO_x concentration was about 40鈥?0 times higher than that in gas period. Hence, reasonable measures should be taken to reduce banking operation, especially in the situation of large excess air ratio. Since NO_x formed during the whole operation process, the most effective way of preventing liquid water and HNO₃ generation is to control the pipe and shell temperature, which should be higher than the condensation temperature of water vapour. The condensation temperature should be considered as the design temperature of pipe and shell for hot stove.