Pyrolysis and combustion combined polygeneration system is a more efficient way for lignite utilization

and can also produce variety of valuable pyrolysis products.To explore the feasibility of this polygeneration system

thermo-gravimetric analysis on YM lignite and DT bituminous coal was conducted

and the characteristic parameters for pyrolysis

combustion

and gasification were obtained.Moreover

the activation energy of each reaction was calculated by Coats-Redfern method.The experimental results showed that

compared with DT bituminous coal

YM lignite pyrolysis process starts at a lower temperature

and its semi-coke reactivity during combustion and gasification was better.In addition

activation energy calculation indicated that

the apparent activation energy of gasification of both coals were much higher than that of the pyrolysis.Therefore

for lignite

pyrolysis and combustion combined polygeneration system may achieve higher efficiency and be worthy for further research.