Research and application progress of circulating fluidized bed gasification with high-alkaline coal
The development and application of circulating fluidized bed gasification with high-alkaline coal technology was systematically reviewed,with a focus on fundamental physicochemical properties,gasification reaction characteristics,alkali-metal migration behavior,anti-slagging technology research,and industrial demonstration of high-alkaline coal gasification.The characteristics of high-alkaline coal,the distribution and content of alkali metals,the influence of pretreatment methods on sodium content determination,and combustion and ash formation properties of high-alkaline coal were outlined.The effects of coal type,gasification temperature,oxygen-to-carbon molar ratio,reaction atmosphere,and reaction extent on gasification performance of high-alkaline coal and slagging characteristics of gasification residue were summarized.The role and reaction mechanisms of blending coals,additives,and replacing bed materials in preventing slagging during high-alkaline coal gasification were elucidated,leading to stable operation of a pilot-scale circulating fluidized bed gasification of high-alkaline coal by using corundum as bed material.The paper also reviewed the original innovation of circulating fluidized bed gasification of high-alkaline coal and its successful applications in production of industrial fuel gas and syngas.Finally,future directions for high-alkaline coal gasification technology were discussed from four perspectives:establishing a database for high-alkaline coal gasification,developing gasification technologies specifically for pure use of high-alkaline coal,developing efficient alkali removal and in-situ coupling utilization innovation technology,and exploring synergistic utilization techniques of high-alkaline coal with other materials to produce high-performance materials.
high-alkaline coalcirculating fluidized bedgasificationmigration of Naslagging
万方数据
维普
