Analysis on characteristics of blast furnace mixed injection biochar and coal
DAN Jiayun1, YUAN Xiang1, ZOU Fanqiu1, LI Renguo2, XU Kun2, NING Xiaojun2, WANG Guangwei2
1. Ironmaking Department, Xiangtan Iron and Steel Co., Ltd. of Hunan Valin, Xiangtan 411101, Hunan, China; 2. School of Metallurgy and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
Abstract：Energy conservation and emission reduction have been elevated to the top priority for the green and sustainable growth of the iron and steel industry in light of the active promotion of the "Dual carbon" target. The application of biomass, a renewable carbon source, in blast furnace ironmaking can significantly lower the CO2 emissions associated with iron and steel production. To improve the metallurgical properties of biomass feedstock for blast furnace injection, this paper employs pyrolytic and hydrothermal carbonization to prepare biochar, and investigates the feasibility of mixing biochar with pulverized coal for blast furnace injection. The results showed that the volatile fraction of biomass hydrochar and pyrolysis char was higher than that of bituminous coal. The fixed carbon content and higher heating value of the mixed coal would gradually decrease when the biochar was mixed with pulverized coal at a ratio of 5% to 20%, though the reduction was only slight. The blended sample is non-explosive and has an ignition point greater than 350 ℃ when the proportion of biochar is less than 20%, which satisfies the safety performance requirements of the blast furnace comminution and injection system. Better grindability and combustibility of biochar can increase the pulverizing and combustion performance of blended sample. The ash melting point of pyrolysis char blends decreases significantly more than that of hydrochar blends due to the high alkali metal content of the ash component. The increase in alkali load of pyrolysis char was substantially more than that of hydrochar when the same proportion of biochar was injected, according to calculations of the alkali load variation of the biochar blending scheme. The alkali load rose by 0.394 3 kg/t for the pyrolysis char blending scheme and 0.006 4 kg/t for the hydrochar blending scheme when the biochar ratio was 20% and the blast furnace coal injection ratio was 140 kg/t. According to the analyses presented above, biomass hydrochar can successfully meet all metallurgical performance requirements for blast furnace injection, whereas biomass pyrolysis char cannot be used to blast furnace injection due to its high content of alkali metals. The development of biomass hydrothermal carbonization technology is therefore necessary to effectively use agricultural and forestry waste biomass resources in the blast furnace ironmaking process.
但家云, 袁骧, 邹凡球, 李仁国, 徐坤, 宁晓钧, 王广伟. 生物质炭煤粉高炉混合喷吹性能分析[J]. 钢铁, 2024, 59(2): 55-64.
DAN Jiayun, YUAN Xiang, ZOU Fanqiu, LI Renguo, XU Kun, NING Xiaojun, WANG Guangwei. Analysis on characteristics of blast furnace mixed injection biochar and coal[J]. Iron and Steel, 2024, 59(2): 55-64.
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2024, Vol. 59 
