Li Wenguang, Shen Yanfeng, Guo Jiang, Kong Jiao, Wang Meijun, Chang Liping
State Key Laboratory of Clean and Efficient Coal Utilization, Taiyuan University of Technology, Taiyuan 030024, P.R. China.
Key Laboratory of Coal Science and Technology (Taiyuan University of Technology), Ministry of Education, Taiyuan 030024, P.R. China.
ACS Omega. 2021 Dec 8;6(50):34967-34976. doi: 10.1021/acsomega.1c05642. eCollection 2021 Dec 21.
A silica-aluminum-based mineral (GL) was selected for inspecting the effects of interactions of minerals in coal blends on the coke reactivity index (CRI) and sulfur transformation during co-pyrolysis of long flame coal and high-sulfur coking coal. Results indicate a good compatibility for the supply of active hydrogen, decomposition of sulfur, and regulation of reactivity. The experimental values of sulfur content in different coal blend cokes are lower than the calculated values, which can be determined as a result of the directional regulation effect of long flame coal on sulfur transformation. The addition of GL in coal blends significantly reduces the CRI of the corresponding coke, and the effect of GL on coke reactivity is also verified by a 10 kg coke oven experiment. When increasing the ratio of long flame coal, the sulfur fixation in the solid phase has a tendency to be enhanced by alkaline minerals. Also, GL plays a role in reducing the capture of sulfur free radicals by alkaline minerals, which improves the sulfur removal during pyrolysis of coal blends and then reduces the sulfur content in coke. This work provides a reference for using silica-aluminum-based minerals to reduce the capture of sulfur and catalytic effect on coke reactivity.
选用一种硅铝基矿物（GL）来考察混煤中矿物相互作用对长焰煤与高硫焦煤共热解过程中焦炭反应性指数（CRI）及硫转化的影响。结果表明，在活性氢供应、硫分解及反应性调控方面具有良好的相容性。不同混煤焦炭中硫含量的实验值低于计算值，这可归因于长焰煤对硫转化的定向调控作用。在混煤中添加GL可显著降低相应焦炭的CRI，10 kg焦炉实验也验证了GL对焦炭反应性的影响。当增加长焰煤比例时，碱性矿物对固相硫固定有增强趋势。此外，GL在减少碱性矿物对硫自由基的捕获方面发挥作用，这改善了混煤热解过程中的脱硫效果，进而降低了焦炭中的硫含量。本研究为利用硅铝基矿物减少硫捕获及对焦炭反应性的催化作用提供了参考。
