煤热解动力学模型的建立

通过对煤热解反应动力学分析,基于分布活化能模型DAEM,建立了集总反应动力学模型表示煤炭热解过程。确定了可以预测热解产物组成、分布与热解终温和升温速率关系的动力学方程。结果表明：随热解温度升高,各种挥发分产物析出率越来越接近最大产率;半焦C含量增加,但产率下降,H,O,N和S等元素降低。升温有利于提高半焦脱硫率、脱氮率。温度为600℃左右时,除H2外的大部分挥发分基本析出,半焦元素变化幅度减小。热解终温较低且一定时,较慢的升温速率有利于各热解挥发分最大限度析出。秦丽娜

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.