Influence analysis of volatile matter in coal on behavior of pyrolysis process
PENG Xue-cheng1,2, SU Yao1,2, GUO Han-jie1,2, LI Bin1,3, HUANG Fu-xin1,4, GUO Jing1,2
1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China; 2. Beijing Key Laboratory of Special Melting and Preparation of High-End Metal Materials, Beijing 100083, China; 3. School of Metallurgical Engineering, Xi′an University of Architecture and Technology, Xi′an 710000, Shaanxi, China; 4. Guangxi Iron and Steel Group Co., Ltd., Fangchenggang 538000, Guangxi, China
Abstract：The development of direct iron reduction process in rotary kilns is limited due to ringing at higher reduction temperature, which leads the process of reducing gas release from coal and reduction of iron ore under low temperature conditions need to be studied. The pyrolysis characteristics and process of iron ore reduction for coals with different volatile component were analyzed by TG-FTIR-MS coupling method. The results show that the coal with high volatile component has more superior reactivity in the pyrolysis process, and the reducing gases in the coal are released at lower temperature and higher content as the volatile component increases. The organic gases in the whole pyrolysis process are mainly CH4, CH3+ fragments, benzene, toluene and congeners, and the inorganic gases are SO2, CO, CO2 and H2O. The reducing gas CO releasing temperature is lower for coal with high volatile component. In addition, during the pyrolysis process, the apparent activation energy of coal with high volatile component is lower, the pyrolysis process is easier. Compared with low volatile component coal, the reduction reaction process is faster and more complete when high volatile component coal is used to reduce iron ore. For this reason, the use of coal with high volatile component for coal-based reduction will provide a new idea to effectively reduce the coal-based reduction temperature.
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2022, Vol. 32 
