摘要
采用TG-FTIR(热重-傅立叶红外光谱)联用的分析方法对红松锯屑的热解失重特性和产物生成特性进行了研究。结果表明,红松锯屑热解失重的主要阶段发生在200～450℃间,反应符合一级反应动力学模型,活化能在70～80kJ·mol-1之间。小粒径有利于热解反应的进行,且该现象随着升温速率的增大而变得显著,但在本实验的梯度水平下粒径对热解特性的影响相对较小。升温速率对热解特性的影响相对较大,高的升温速率导致热解起始温度和失重峰温度向高温区移动,加快了热解进程,且升温速率达到50K·min-1时,在735℃左右观察到特殊失重峰。FTIR的实时分析结果表明,热解的气态产物主要有CO2、CO、CH4和其他低分子烃类,通过对产物浓度变化的半定量分析,验证了粒径对热解特性的影响效果以及735℃左右特殊失重过程的存在。
A study was carried out to study the pyrolysis characteristics and gas production of pine sawdust by TG-FTIR analysis. The results showed that the main weight loss happened between 200 ℃ and 450 ℃, and the kinetic process could be simplified as a first-order reaction with an activation energy 70-80 kJ·mol^-1. Smaller particle size was in favor of the pyrolysis reaction, and the differences could be observed more easily with a higher heating rate, but the effects of particle size on pyrolysis were not as prominent as that of heating rate under the experimental conditions. Higher heating rate could result in a higher initial reaction temperature and make the reaction much quicker. Especially, when the heating rate reached 50 K·min^-1, a weight loss peak was observed around 735 ℃. FTIR analysis results indicated that the main gas products of pyrolysis were CO2, CO, CH4 and other low molecular weight hydrocarbons, and the effects of particle size on pyrolysis process together with the special weight loss peak around 735 ℃ were verified through semi-quantitative analysis of the concentration change of gas products.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2008年第1期380-384,共5页
Journal of Agro-Environment Science
