摘要
为高效清洁地利用低阶煤,通过有机溶剂热萃取法获得超精煤(hyper coal)。采用升温热重分析法在惰性气氛下,研究原煤和超精煤热解过程;使用特征参数对煤样热解失重过程进行表征;采用分段模型拟合法确定不同阶段的动力学模型及其对应的热解动力学参数。结果表明:随着升温速率增大,在原煤和超精煤热解过程均存在热滞后现象,其最大影响区间分别对应于原煤热解的中温段和超精煤热解的低温段。分段拟合处理结果表明,原煤低温和中温段热解机制均为一维扩散模型,高温段热解机制为二级化学反应模型;超精煤的3个温度段热解机制分别为一维扩散模型、三维扩散模型和二级化学反应模型。
For the effective and clean use of low rank coal,hyper coal was obtained by organic thermal dissolved process. The pyrolysis process of raw coal and hyper coal was studied by thermogravimetric analysis methods.The characteristic parameters were used to characterize the process of pyrolysis of coal samples.The kinetics of different stages was determined by piecewise model fitting method and its corresponding pyrolysis kinetic parameters.The results show that there is a thermal hysteresis in the process of pyrolysis of raw coal and hyper coal with the increasing of heating rate,which has great influence on the medium temperature stages of raw coal and low temperature stage of hyper coal pyrolysis,respectively.By subsection analysis,the one-way transport diffusion model is adapt to lower and medium temperature range,and second order chemical reaction is adapt to higher temperature range of raw coal. The three stages of hyper coal pyrolysis process can be well described by one-way transport diffusion model,three-way transport diffusion model and second order chemical reaction,respectively.
作者
郭龙飞
左海滨
赵骏
王亚杰
王静松
GUO Longfei;ZUO Haibin;ZHAO Jun;WANG Yajie;WANG Jingsong(State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China)
出处
《洁净煤技术》
CAS
2018年第2期40-45,50,共7页
Clean Coal Technology
基金
国家重点研发计划资助项目(2016YFB0600701)
国家自然科学基金面上资助项目(51574023)
关键词
超精煤
热解
动力学
模型拟合
hyper coal
pyrolysis
kinetics
model fitting
