气流床气化具有原料适应性广、碳转化率高、单炉处理量大、环境污染小等显著优势，已成为当今煤气化技术的主流发展方向。气流床气化过程涉及高温、高压下多相流动与复杂化学反应的相互作用，炉内反应机理尤为复杂。开展多喷嘴对置式气流床气化炉内热态行为研究能为揭示气流床气化炉内反应机理、丰富和发展气流床煤气化理论体系以及为工业气化装置优化设计和长周期高效稳定运行提供重要依据。本文综述了气流床气化炉内温度场及撞击火焰结构、高温颗粒群动态特性(原位雾化、颗粒流动及演化行为)、火焰光谱辐射特性、煤灰熔融机理和流动特性、气化过程固体结构演变及其对气化反应机理的影响等多喷嘴对置式气流床气化热态行为关键科学问题的国内外研究进展。研究人员提出并验证了单视角重建气流床气化三维火焰结构及三维温度场的数学方法，揭示了气流床气化炉内热态颗粒形态、空间行为及壁面沉积过程统计学规律，基于火焰自由基分布特征揭示了撞击气化过程强化反应机理，获得了煤灰中不同矿物组分对煤灰熔融机理及流动特性的定性影响规律，系统考察了气化过程固体理化结构演变规律及其对气化反应的作用机制。展望了今后多喷嘴对置式气流床气化热态行为的研究方向。

Entrained-flow gasification shows great advantages such as wide adaptability of raw materials,high carbon conversion,large capacity of single furnace,low pollution emissions,etc. ,and has been the main development direction among all coal gasification technologies. This entrained-flow gasification process involves the interaction of multiphase flow and complex chemical reaction under high-temperature and high-pressure operation conditions,and shows particu- larly complicated reaction mechanism inside the gasifier. It is very important to conduct research on the hot-model be- havior of the Opposed Multi-burner (OMB) entrained-flow gasification,so as to reveal the reaction mechanism inside entrained-flow gasifier,enrich and develop the theoretical system of entrained-flow coal gasification,and provide reference data for the optimization design and the long-term,high-efficiency and stable operation of industrial gasifiers. In this paper,the research progress on the key scientific issues related to hot-model behavior of OMB entrained-flow gasi- fication are reviewed,such as the temperature field and impinging flame structure,the dynamic characteristics of high- temperature particle groups ( in-situ atomization,particle flow and evolution behaviors) inside the gasifier,the spec- trum radiation characteristics of entrained-flow gasification flame,the fusion mechanism and flow characteristics of coal ash,and the solid structure evolution during gasification and its influence on gasification mechanism. Previous re- searchers have proposed and verified the mathematical methods for single-view reconstruction of 3-D flame structure and temperature field inside gasifier,revealed the statistics law of the morphology and spatial behavior of high-tempera- ture particles inside gasifier,put forward the intensification reaction mechanism of impinging gasification process based on the flame radical distribution characteristics,acquired the qualitative influence law of different mineral components of coal ash on fusion mechanism and flow characteristics of coal ash,and systematically investigated the evolution law of solid physicochemical structure in gasification process and its influence mechanism on gasification reaction. Moreo- ver,the prospects for the future research work on the hot-model behavior of OMB entrained-flow gasification are pro- posed.