摘要
在不同升温速率（5、10、20、30K·min^-1）下，对竹材进行TG、DTG分析．试样从313～650K的升温过程经历了水分析出、第一步热解和第二步热解过程．用Levenberg-Marquardt方法对非等温动力学过程进行数据拟合，结果表明，半纤维素在较低温度下热解，仅生成挥发性组分，表现为第一步热解，可以用简单一级反应描述；纤维素和木质索在较高温度下热解，表现为第二步热解，是竞争的平行一级反应，产物分别是挥发性组分和竹炭．第一热解过程与热解升温速率有关，而第二热解过程与升温速率无关．
Bamboo materials were pyrolyzed in TGA equipment （TGA/SDTA851^e） at heating rate of 5, 10, 20, 30 K· min^-1 in the temperature range of 313-650 K and N2 atmosphere. The pyrolysis process of bamboo consisted of three steps, pre-pyrolysis of water evaporation, first step pyrolysis and second step pyrolysis. The kinetics of bamboo pyrolysis was analyzed based on the Levenberg-Marquardt method. The first step of bamboo pyrolysis could be considered as the pyrolysis of semi cellulose to volatile matter only and well described by a first-order reaction model. The second step of bamboo pyrolysis could be considered as the pyrolysis of cellulose and lignin to volatile matter and char, and well described by a parallel first-order reaction model. The first step of bamboo pyrolysis was dependent on heat-up rate, while the second step of bamboo pyrolysis was independent of heat-up rate.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2006年第2期318-323,共6页
CIESC Journal
关键词
竹材
热解
动力学
生物质
可再生资源
bamboo
pyrolysis
kinetics
biomass
renewable resources
