基于源质的煤基中间相小球体生成与可控演化

煤全组分族分离所得的密中质组是中间相小球体生成的来源物质（即源质）。以该源质为原料，制备煤基碳质中间相。考察了炭化过程中温度、恒温时间、氮气流速、原料进样方式和添加剂等因素对中间相小球体生成过程的影响，探讨了中间相小球体演化过程的可控性。结果表明：温度、恒温时间、进样方式是影响中间相小球体生成的主要因素，能够控制生成中间相小球体粒径大小；温度升高或恒温时间延长均会加剧原料分子的热反应，促进中间相小球体的生成和融并；大面积的融并将使粒度迅速增加，部分球体解体，球体数目下降，最终形成体中间相；进样方式主要通过影响小球体演化过程中挥发性气体的逸出及原料颗粒间热传递效率影响小球体的生成和发展；氮气流速起到辅助调控作用；添加剂的加入促进了原料成核，加速了小球体的生成。

Formation and controllable evolution of coal-based mesophase spherule from coal dense medium component

Coal dense medium component from the coal all-components group separation serves as the material.The coal-based carbonaceous mesophase was prepared from the coal dense medium component.By adjusting the carbonization temperature,holding time,flow rate of N2,form of sample introduction and content of additives to investigate the effects on the generation of the mesophase spherule.The controllability in the evolution process of mesophase spherule was discussed.The results show that the carbonization temperature,the holding time and the manner of sample introduction are the major factors to effect the generation of the mesophase spherule.The particle size of the mesophase spherule is controlled by the factors.With the temperature raises and the holding time prolonges,the thermal reaction of resource material molecules is strengthened and the generation and aggregation rate of spherules increases.Then the size of spherules increases by aggregation.When the size is too much to keep the sphere,the spherules break up to form bulk mesophase,which results in the spherule number decreasing.The generation and growth of spherules can be affected by the manner of sample introduction which has influence on the escape of volatile gas and the thermal transmission efficiency among the material particles.The flow rate of N2 assists the controllability in the evolution process of mesophase spherule.The additives promote the materials to generate the nucleus of the mesophase spherule,therefore accelerate the generation of the mesophase spherule.