Coal-fired chemical looping combustion with hematite and ilmenite oxygen carriers
LI Yanbing
ZHANG Shuai
LIU Qiusheng
SUN Ping
Abstract：To screen the low-cost and high-efficient oxygen carrier that is suitable for coal-chemical-looping combustion process,lowcost and enviromnentally friendly hematite and ilmenite with different chemical composition and structure properties were adopted as the nominated oxygen carriers to investigate their reaction performance in a lab-scale fixed-bed reactor.Results show that higher reaction temperature is effective to enhance the coal gasification reaction rate and reaction performance of both two oxygen carriers,resulting in the CO2 concentration and carbon conversion being improved by different degrees.However,excessive reaction temperature is easy to cause the sintering and agglomeration on these two oxygen carrier particles,and eventually inhibits the conversion of coal gasification products.Compared to the performance of hematite,ilmenite shows a better pore structure and reaction performance,higher CO2 capture efficiency and carbon conversion efficiency could be achieved,and therefore is more suitable for coal-chemical-looping combustion process.
Keywords：coal chemical-looping combustionhematiteilmenitereaction characteristics
Publication Date：2017-01-01