1. National Energy Group Shendong Group Co., Ltd., Ordos 719315, Nei Mongol, China; 2. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China; 3. School of Metallurgy and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
Abstract：Shendong Shangwan high calcium bituminous coal has obvious characteristics of low ash and high calcium, and is rich in coal source reserves, which has the possibility of blast furnace injection. Under the background of cost controlling and low-carbon green smelting in the steel industry, it is of positive significance to optimize the structure of blast furnace coal injection resources and inject bituminous coal with high-cost performance. Taking Shangwan high calcium bituminous coal as the research object, the effect of it blending with different kinds of anthracite on combustion promoting of blast furnace coal blending and its influence on the combustion state of blast furnace tuyere were studied. The results show that under the condition of the same kind of anthracite, with the increase of Shangwan high calcium bituminous coal ratio, the combustibility of blended coal is enhanced and the combustion rate is improved, and Shangwan highcalcium bituminous coal blending Russian anthracite is the best matching coal. At the same time, due to the high calorific value of Shangwan high calcium bituminous coal, the blending can not only provide more heat to the blast furnace raceway zone, but also maintain the theoretical combustion temperature of blast furnace. On the premise of ensuring the injection safety, Shangwan high calcium bituminous coal is combined with actual smelting conditions of a steel plant. Through the analysis of the new theoretical combustion temperature calculation model, it is concluded that due to the high combustion rate and low ash content of Shangwan high calcium bituminous coal, the theoretical combustion temperature can be stabilized and the stable and smooth operation of the blast furnace can be guaranteed without additional adjustment means after adding this bituminous coal. Therefore, Shangwan high calcium bituminous coal has wide application prospect in the field of blast furnace ironmaking injection.
Liu L L,Kuang S B,Jiao L L,et al. Optimization of pulverized coal injection (PCI) rate in an ironmaking blast furnace by an integrated process model[J]. Fuel,2022,315:122832.
[6]
WANG S,WU F,ZHANG G,et al. Research on the combustion characteristics of anthracite and blended coal with composite catalysts[J]. Journal of the Energy Institute,2014,87(2): 96.
Novokhatskii A M,Diment'ev A O,Padalka A V. Theoretical combustion temperature in blast furnaces[J]. Steel in Translation,2018,48(9):593.
[21]
ZHANG J L,WANG G W,SHAO J G,et al. Comprehensive mathematical model and optimum process parameters of nitrogen free blast furnace[J]. Journal of Iron and Steel Research International,2014,21(2):151.
WU S,LIU C,FU C,et al. Improvements on calculation model of theoretical combustion temperature in a blast furnace[J]. Journal of Iron and Steel Research International,2011,18(12):1.
[25]
ZHANG J P,JIA X W,WANG C A,et al. Experimental investigation on combustion and NO formation characteristics of semi-coke and bituminous coal blends[J]. Fuel,2019,247:87.
ZHOU D,CHENG S,ZHANG R,et al. Study of the combustion behaviour and temperature of pulverised coal in a tuyere zone of blast furnace[J]. Ironmaking and Steelmaking,2018,45(7):665.
[28]
Wijayanta A T,Alam M S,Nakaso K,et al. Combustibility of biochar injected into the raceway of a blast furnace[J]. Fuel Processing Technology,2014,117:53.
2023, Vol. 33 
