Research progress on hot-model behavior of opposed multi-burner entrained-flow gasification

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.