同步辐射技术探究配煤炼焦过程中挥发分传质对硫分变迁的影响机制

The partial substitution of high quality coking coal by coking and fat coal with high sulfur content during coal blending coking process is not only helpful for the value enhancement of inferior coal and effective cost reduction of the coke production, but also promote the rapid transformation and upgrade of coking industry and has quite great practical significance and application prospect. Focusing on the present bottleneck problems in the sulfur directional regulation during pyrolysis of high sulfur content coking coal and fat coal, starting study with the effect of volatile mass transfer on sulfur transformation, based on coal blending fundamentals in present coking industry and combining the synchrotron radiation in-situ characterization technique and traditional experimental methods, this project has two vital scientific issues: the effect of interaction between volatile mass transfer, coal matrix and mineral matters on sulfur transformation during coal pyrolysis, and the effect of volatile mass transfer on sulfur transformation and distribution under layered coking condition during coal blending coking process. This project aims to investigate the influence rules of volatile mass transfer on sulfur transformation behavior from different scales, such as single coal particle (single coal type), inter-particle (different coal types) and layered coking method. Besides, with the help of isotopic tracer method and other analytical experiments, the influencing mechanism will be further revealed and illuminated and the research results will supply scientific instruction for the efficient sulfur directional regulation during coal blending coking process of high sulfur content coking coal and fat coal.

利用高硫煤部分替代优质炼焦煤进行配煤炼焦，在提升其利用价值的同时，有效降低焦炭生产成本，有助于促进焦化企业的快速转型升级，具有重要的现实意义和应用前景。本项目围绕高硫煤配煤炼焦过程中硫分定向调控所面临的瓶颈问题，基于工业炼焦配煤基础，以挥发分传质对硫分变迁的影响为切入点，利用同步辐射原位表征技术和传统实验手段相结合的方法，以“煤热解过程中挥发分传质与煤基体、矿物质的相互作用对硫分变迁的影响，及配煤炼焦过程中成层结焦方式下挥发分传质对形态硫变迁及分布的影响”为关键科学问题，从单颗粒（单煤种）、颗粒间（煤种间）、成层结焦方式等不同尺度探究挥发分传质对硫分变迁行为的影响规律，并借助同位素示踪法设计系列实验进一步揭示和阐明其影响机制，为高硫煤配煤炼焦过程中硫分定向调控提供理论基础和科学指导。

本项目围绕高硫煤配煤炼焦过程中硫分定向调控所面临的瓶颈问题，结合同步辐射原位表征技术和传统实验手段，分析了高硫炼焦煤及其分选组分的煤种特性和硫热变迁行为，揭示了炼焦煤化学结构对形态硫迁移分布的影响机制；基于“原位”供氢思路，利用同步辐射技术、小型热解实验、分层堆叠坩埚焦试验等不同尺度梯级试验解析了挥发分传质对硫分变迁行为的影响机制，提出较宽CH4释放温区的高挥发分煤能够有效调控高硫煤热解硫变迁行为；探究了气煤挥发物对硫分空间分布的影响，确定了相应的脱硫有效距离；利用分层渗透性实验揭示了挥发物传质对塑性体渗透性的调控机制，掌握了挥发物传质驱动力和阻力的动态平衡，建立了“挥发分传质条件-成焦阶段-硫分过程调控”的本质关联；通过10 kg、40 kg和300 kg梯级焦炉试验平台进行炼焦试验，验证了高有机硫焦、肥煤配煤炼焦过程中硫分过程调控方法的可行性，并在现行主流焦炉炉型上进行了工业示范。本项目研究成果对高效利用高硫炼焦煤资源，保护优质炼焦煤，促进焦化行业可持续发展具有重要科学理论和应用指导意义。