1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China 2. Xuanhua Iron and Steel Group Co. , Ltd. , Xuanhua 075100, Hebei, China
Hazard Control of NOx in Hot Stove
Chuan CHEN1,Shu-sen CHENG1,Xi-bin GUO2
1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China 2. Xuanhua Iron and Steel Group Co. , Ltd. , Xuanhua 075100, Hebei, China
ժҪ Hazard control of NOx is very important for the long life of hot stove shell and environmental protection. NOx 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 NOx 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�� in order to decrease NOx emission. In the case of banking operation, NOx concentration was about 40-60 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 NOx 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.
Abstract��Hazard control of NOx is very important for the long life of hot stove shell and environmental protection. NOx 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 NOx 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�� in order to decrease NOx emission. In the case of banking operation, NOx concentration was about 40-60 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 NOx 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.
��������:National Key Basic Research and Development Program of China
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E-mail: chenchuan606@163.com
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Chuan CHEN,Shu-sen CHENG,Xi-bin GUO. Hazard Control of NOx in Hot Stove[J]. �й������ڿ���, 2014, 21(3): 306-311.
Chuan CHEN,Shu-sen CHENG,Xi-bin GUO. Hazard Control of NOx in Hot Stove. Chinese Journal of Iron and Steel, 2014, 21(3): 306-311.
2014, Vol. 21 
