The effects of steam partial pressure

pyrolysis temperature

coke-forming time and gasification temperature on steam gasification of Yining coal char were studied

and a dynamic model was established for the gasification reaction.The results show that

the gasification reaction activity of char increases with the steam partial pressure(when the steam partial pressure is greater than 0.045MPa

the active sites on char have reached saturation)

while rising the pyrolysis temperature and prolonging the constant temperature time can both reduce the gasification reaction activity of char.With the increasing gasification temperature

the influence of pyrolysis temperature and coke-forming time on the steam gasification decreases.The gasification temperature is the main factor affecting the gasification activity of char.Rising the gasification temperature can enhance the gasification reactivity significantly.The activation energy obtained by the shrinking core model ranges from 148.2kJ/mol to 189.6kJ/mol

which can describe the steam gasification of Yining coal.