Establishment of dynamics model for coal pyrolysis

Based on the analysis of coal pyrolysis reaction dynamics and distribution activation energy model（DAEM）,the lumped reaction kinetics model was established to represent the pyrolysis process.The kinetics equations which can estimate the relation among the composition,distribution of pyrolytic products and final pyrolysis temperature and heating rate were determined.The results show that,the emission rate of volatile matter approach the ultimate production rate with the rising of final pyrolysis temperature,while semi-coke yield reduce,of which C content increase and the others including H,N,O and S content decrease.Therefore,the rising of final temperature favore the desulfurization and denitrification of semi-coke.The most volatile except H2 basically release and elements change range of semi-coke decrease at 600 ℃.When pyrolysis temperature remain constant,slow heating is beneficial to the full emission of volatile matter.Consequently,the model can precisely describe the whole coal pyrolysis process.