不同贮存年份烟梗的热解特性分析
Analysis of pyrolysis characteristics of tobacco stem in different storage years
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摘要: 通过热重技术揭示河南、湖南和贵州地区不同贮存年份烟梗之间的热解差异,利用电子显微镜、热重分析仪结合红外光谱仪分析了河南地区不同贮存年份烟梗的表面结构、热解特性和气态产物组成,并基于Coats-Redfern法对比分析不同贮存年份烟梗在热解过程中各失重阶段的动力学参数差异。结果表明:不同贮存年份对河南、湖南、贵州烟梗热失重行为的影响表现出相似性,均为贮存1年烟梗的综合热解指数(1.27~1.39×10-4%· min-1·℃-2)高于贮存2年和3年的烟梗,热解特性较好,贮存3年烟梗的残余率为18.18%~27.45%,热稳定性较差;河南地区不同贮存年份的烟梗在热解过程中释放的热解气体产物成分相似,最大释放量表现为贮存3年烟梗>贮存2年烟梗>贮存1年烟梗,且贮存3年烟梗表面组织结构完整性较差;不同贮存年份烟梗热解主要失重阶段均符合F1.5级化学反应控制模型。Abstract: Thermogravimetry was used to reveal the pyrolysis differences of tobacco stems in different storage years in Henan, Hunan and Guizhou. The surface structure, pyrolysis characteristics and gaseous product composition of tobacco stems in different storage years in Henan were analyzed by electron microscopy and the IG-FTIR instrument,and the difference of kinetic parameters in each weight loss stage of stem in different years during the pyrolysis were compared and analyzed based on the Coats-Redfern method. The results showed that the effects of different storage years on the thermal weight-loss behavior of tobacco stems from Henan, Hunan and Guizhou were similar. The CPI value of tobacco stems stored for 1 year (1.27~1.39×10-4%·min-1·℃-2) was higher than that of tobacco stems stored for 2 and 3 years, indicating good pyrolysis characteristics; the residual rate of tobacco stems stored for 3 years was 18.18%~27.45%, with poor thermal stability.While the types of pyrolysis gas products released by tobacco stems in different storage years in Henan were similar, and the maximum gas product release rate was shown as follows: tobacco stems stored for 3 years> those stored for 2 years> those stored for 1 year, and the integrity of the surface structure of tobacco stem was poor after 3 years storage, the main weight loss stages during the thermal decomposition of different storage years' tobacco stem was mainly controlled by a 1.5-order chemical reaction model.
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Key words:
- tobacco stem /
- pyrolysis characteristics /
- kinetic analysis
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