Abstract: High-efficiency combustion of residual carbon from gasification（RCG）is key to its cascade utilization. Cocombusting it with coal is a promising method to lower the fire point and dent the difficulty in burn-out.Studying the cocombustion characteristics of RCG and three low-rank coals（YN lignite，HM long flame coal and SH non-caking coal）by thermogravimetric analysis，their featured parameters and interactions were obtained. Taking multiple scanning method， the co-combustion kinetics parameters of RCG and low-rank coals were analyzed. The results showed that the peak temperatures difference（DT）of co-combusted RCG and coals was narrowed down，compared with that of an individual fuel. And DT decreased with the mounting of RCG when it was co-combusted with SH coal and YN coal，which indicated apparent interactions between RCG and coals during co-combustion. The release and combustion of volatile matters could promote the combustion of RCG.The rich calcium and iron in Hami coal had a certain catalytic effect on the combustion of RCG. According to kinetics analysis，the apparent activation energy of the blended sample is lower compared to that of RCG，which implied the overall combustion performance could be improved by co-combustion of RCG and coals.

Key words: residual carbon from gasification, low-rank coals, co-combustion, combustion characteristics, combustion kinetics, coal gasification, thermogravimetric analysis