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| Effect of steam injection from material surface on output and quality of sinter and CO emissions |
| LUO Yun-fei1, YANG Tao1, ZHOU Jiang-hong2, CHUN Tie-jun1, PEI Yuan-dong3, LONG Hong-ming1 |
1. School of Metallurgical Engineering, Anhui University of Technology, Ma′anshan 243032, Anhui, China;
2. Manufacturing Department, Ma′anshan Iron and Steel Co., Ltd., Ma′anshan 243002, Anhui, China;
3. Iron Former Management Center, Zhongtian Iron and Steel Group Co., Ltd., Changzhou 213000, Jiangsu, China |
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Abstract With the continuous tightening of the ultra-low emission standard for the pollutants from sintering flue gas in the steel industry, the sintering material surface injection technology has become a new research hotspot due to its potential advantages of energy saving and emission reduction, it is widely considered as a sintering process control technology with certain comprehensive emission reduction effect at present. In order to find out the optimal process system of steam injection on the material surface and to find out the mechanism of the effect of steam injection on the sintering process, in order to realize its industrial application, a sintering raw material of a steel plant was used, the effects of total steam injection rate, injection flow rate and initial injection time on sinter quality and CO emission were studied. The results show that under the condition of 50 kg sinter cup raw material, the best experimental conditions of steam injection on the material surface should be 15 min after 8 min of sintering ignition, 0.02 m3/min of injection flow and 180 g of total injection, the production rate and drum strength increased by 0.60% and 1.94%, the solid energy consumption decreased by 1.15 kg/t, and the CO concentration decreased by 10.91%. The results show that the injection steam can make the carbon in the fuel fully react with other blended minerals, and the effect of high temperature reaction is remarkable, and then the yield and drum strength are improved. At the same time, the suitable addition of steam to the sintering high temperature zone reaction is beneficial to the reaction of H2O with C and O2, and the CO in the reducing atmosphere is converted into CO2, and then the CO emission and the sintering solid energy consumption are reduced. On the whole, under the reasonable injection system, the steam injection can reduce the CO emission and improve the sinter quality.
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Received: 11 March 2021
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2021, Vol. 56 
