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林业科学 ›› 2015, Vol. 51 ›› Issue (12): 79-86.doi: 10.11707/j.1001-7488.20151210

• 论文与研究报告 • 上一篇    下一篇

7种果壳的热解特性及与主要组分相关性分析

蒋新元, 廖媛媛, 郭忠, 孟安, 黄泽才, 杨素文   

  1. 中南林业科技大学材料科学与工程学院, 长沙 410004
  • 收稿日期:2015-03-13 修回日期:2015-09-28 出版日期:2015-12-25 发布日期:2015-12-29
  • 基金资助:
    湖南省教育厅重点项目"林业剩余物定向催化热解制备富酚生物油及其调控机理研究"(13A119)。

Pyrolysis Characteristics and Correlation Analysis with the Major Components of Seven Kinds of Nutshell

Jiang Xinyuan, Liao Yuanyuan, Guo Zhong, Meng An, Huang Zecai, Yang Suwen   

  1. School of Materials Science and Engineering, Central South University of Forestry and Technology Changsha 410004
  • Received:2015-03-13 Revised:2015-09-28 Online:2015-12-25 Published:2015-12-29

摘要: [目的]分析果壳的热解特性及与果壳中纤维素、木质素及半纤维素的相关性,为果壳类生物质的热化学转化利用提供基础数据。[方法]分析油茶壳、椰子壳、油桐壳、核桃壳、板栗壳、开心果壳和腰果壳的纤维素、木质素和半纤维素含量,并进行热重分析,同时分析7种果壳的热解失重峰值温度与果壳中纤维素、木质素和半纤维素含量的相关性。[结果]除腰果壳外,其他6种果壳的主要成分为纤维素、酸不溶木质素和半纤维素,三者总含量均在73%以上,腰果壳中纤维素、半纤维素和酸不溶木质素三者总含量仅为47.41%。除油桐壳以外,其他6种果壳在200~410℃温度范围均出现多个热解失重峰,椰子壳、油茶壳、开心果壳与腰果壳最高温热解失重峰的左侧出现明显的尖状热解失重峰,核桃壳和板栗壳则在最高温热解失重峰的左侧出现肩状热解失重峰。7种果壳的热解动力学模型符合一级动力学方程,热解活化能在40~85 kJ·mol-1之间。果壳的最高温热解峰峰值温度与果壳中木质素含量呈明显的正相关性(R=0.800,P=0.03 < 0.05),与纤维素含量的正相关性较弱(R=0.446,P=0.32 > 0.05),与半纤维素含量呈较弱的正相关性(R=0.509,P=0.24 > 0.05),与果壳中木质素和纤维素总含量的正相关性更显著(R=0.899,P=0.005 < 0.05)。7种果壳(除油桐壳外)左侧热解峰的峰值温度与半纤维素含量呈明显的正相关性(R=0.836,P=0.04 < 0.05),与木质素含量呈弱的正相关性(R=0.484,P=0.33 > 0.05),而与纤维素含量的正相关性更弱(R=0.295,P=0.57 > 0.05)。[结论] 7种果壳中纤维素、木质素与半纤维素含量不同,各具有不同的热解特性,其最高温热解峰峰值温度主要受果壳中木质素含量的影响,而其左侧热解峰峰值温度主要受果壳中半纤维素含量的影响。

关键词: 果壳类生物质, 热解, 组分分析, 热重分析, 相关性分析

Abstract: [Objective] Nutshells are important forest biomass resources for energy in China. In order to provide theoretic supports for the thermal conversation and utilization of nutshells,the pyrolysis characteristics of nutshells and the correlations of cellulose,hemicellulose and lignin were investigated in this study.[Method]The cellulose, hemicellulose and lignin contents of seven kinds of nutshells, including Camellia shell, Coconut shell, Tung shell, Walnut shell, Chestnut shell, Pistachio shell and Cashew nut shell, were measured.Using the thermogravimetric analysis the correlations between pyrolysis peak temperature and the cellulose, hemicellulose and lignin content of nutshells were also analyzed.[Result]The major components of the six kinds of nutshell except Cashew nut shell are cellulose, lignin and hemicellulose, and the total content of these three components is more than 73%, while the total content of that in Cashew nut shell is only 47.41%. Several mass loss peaks are observed on temperature range from 200 to 410℃ during the whole pyrolysis process for six kinds of nutshells except Tung shell.Obviously pointed pyrolysis peaks on the left of the maximum pyrolysis peaks are appeared for Coconut shell, Camellia shell, Pistachio shell and Cashew nut shell, while for Walnut shell and Chesnut shell, acromion pyrolysis peaks on the left of the maximum pyrolysis peaks are found. The pyrolysis kinetic equations of all seven kinds of nutshells meet first-order kinetic equation, and the pyrolysis activation energy is ranged in 40-85 kJ·mol-1. The correlation between the maximum pyrolysis peak temperature and the lignin content of nutshells is significantly positive (R=0.800, P=0.03 < 0.05), the correlation between the maximum pyrolysis peak temperature and the cellulose content of nutshells is weakly positive (R=0.446, P=0.32 > 0.05), and that between the maximum pyrolysis peak temperature and the hemicellulose content of nutshells is weakly positive too (R=0.509, P=0.24 > 0.05), however,the correlation between the maximum pyrolysis peak temperature and the total content of lignin and cellulose in nutshells is more significantly positive (R=0.899,P=0.005 < 0.05). The correlation between the left-side pyrolysis peak temperature and the hemicellulose content of nutshells except Tung shell is significantly positive (R=0.836, P=0.04 < 0.05), and that between the left-side pyrolysis peak temperature and the lignin content of nutshells is weakly positive (R=0.484, P=0.33 > 0.05), and that between the left-side pyrolysis peak temperature and the cellulose content of nutshells is weaker positive (R=0.295, P=0.57 > 0.05).[Conclusion] The pyrolysis characteristics of nutshells is influenced by the contents of cellulose, lignin and hemicellulose.The maximum pyrolysis peak temperature in the DTG curve of nutshells is mainly influenced by the lignin content, while the left-side pyrolysis peak temperature is mainly influenced by the hemicellulose content.

Key words: nutshell biomass, pyrolysis, composition analysis, thermogravimetric analysis, correlation analysis

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