变物性高温熔融流体离心粒化网状破裂模式多相流换热及调控研究

高温液态高炉渣是高炉炼铁过程产生的主要副产物，其中蕴含了大量高品位余热资源，但目前暂未实现其余热回收。目前，液态熔渣离心粒化余热回收技术已被公认是最有发展潜力的液态高炉渣余热回收方法。然而，高炉巨大的排渣流量必然使离心粒化过程进入粒化性能较差的膜状分裂模式，导致粒化颗粒直径显著增大，从而降低系统余热回收效率。因此，大熔渣流量条件下离心粒化膜状分裂模式的粒化性能不足成为该技术工业化应用的关键瓶颈问题。本项目将揭示自由液膜穿孔破裂形成粒化性能较好的网状破裂模式的条件及形成机制；明晰网状破裂模式下自由液膜多相流动和换热之间的相互作用关系；提出基于新型双层结构粒化器以及外加多孔细微颗粒气流冲击自由液膜的离心粒化强化手段，从而为大流量条件下液态高炉渣离心粒化性能的提升提供理论支撑，有力的推动液态高炉渣离心粒化余热回收技术工业化应用进程。

High temperature molten blast furnace slag is a by-product of the blast furnace iron making process, which contains a large amount of high-grade waste heat, but the waste heat recovery has not yet been achieved. At present, the molten slag centrifugal granulation and waste heat recovery technology has been recognized as the most promising waste heat recovery method. However, the huge molten slag discharge flow rate of the blast furnace will inevitably make the centrifugal granulation in the film fragmentaion mode with poor granulation performance, resulting in a significant increase in the diameter of the granulated particles and reducing the waste heat recovery efficiency of the system. Therefore, the poor granulation performance of the molten slag centrifugal granulation in film fragmentaion mode under large flow conditions is the key industrial application technical bottleneck of this technology. This project will reveal the conditions and formation mechanism of the free liquid film perforation and rupture to form a film perforation fragmentation mode with better granulation performance. Besides, the interaction effect between free film multiphase flow and heat transfer in the film perforation fragmentation mode will be clarified. Then, the centrifugal granulation strengthening methods of new double-layer structure granulator and the impacting of free film by the porous fine particles carried airflow will be propose, so as to provide theoretical support for the improvement of the centrifugal granulation performance of molten slag under large flow conditions, and promote the industrial application process of molten slag centrifugal granulation waste heat recovery technology.