Oxy-fuel combustion characteristics and kinetic parameters of lignite coal from thermo-gravimetric data

摘要

Combustion characteristics of Yi Min lignite and Zhun Dong lignite in O_2/CO_2 atmosphere were investigated by thermo-gravimetric analysis. The effects of the coal type and O_2 concentration were studied. The results indicate that the increasing of O_2 concentration can significantly improve the combustion performance especially when the O _2 concentration is less than 60%. The activation energy corresponding to the YM lignite combustion in O_2/N_2 and O _2/CO_2 atmospheres was evaluated by two isoconversional methods. The calculation results showed that further research is required whether the activation energy calculation with isoconversional methods for complex reaction process can be used as a basis for judging the degree of the reaction difficulty.