基于热重的南方7种典型乔木叶片热解特性和燃烧性分析  

Analyses on pyrolysis characteristics and flammability of leaves and needles of 7 typical tree species in southern China based on thermogravimetric analysis(TGA)

作　　者：金森[1] 杨艳波[1] 

机构地区：[1]东北林业大学,黑龙江哈尔滨150040

出　　处：《中南林业科技大学学报》2015年第12期58-63,共6页Journal of Central South University of Forestry & Technology

基　　金：国家林业公益性行业科研专项(201204508)

摘　　要：通过对南方7种典型乔木叶片在空气气氛条件下,升温速度为10℃·min^(-1)的热重分析,研究了其热解特性和热解动力学特征,并基于热解参数对其燃烧性进行了四维评价。结果表明:(1)综纤维素开始分解的温度为140.54~158.67℃,结束温度为372.01~389.91℃。木素开始分解温度为372.01~389.91℃,结束温度为538.63~581.32℃。(2)综纤维素热解的活化能为34.059~48.531 k J·mol^(-1),指前因子为72.012~1 966.463 min^(-1)。木素热解的活化能为31.264~54.091 k J·mol^(-1),指前因子为31.755~1 909.015 min^(-1)。除麻栗和毛竹外,木素热解的活化能和指前因子都高于综纤维素的活化能和指前因子。(3)7种可燃物的四维燃烧性不完全一致。华山松四维燃烧性都高,麻栗都差。其他5个树种的四维燃烧性不一致。Pyrolysis characteristics and kinetics parameters of leaves and needles of 7 typical tree species in southern China were obtained from data of thermogravimetric analysis under air at temperature rising rate of 10 ℃ .min-1. Four dimensional flammability of the fuels were elevated by using some of the pyrolysis parameters. The results show that the starting and ending temperature of pyrolysis of hollycellulose ranged from 140.54 -- 158.67 ℃ and from 372.01 - 389.91 ℃ , respectively. Those for lignin were from 372.01-- 389.91 ℃ and from 538.63-- 581.32 ℃ . Activation energy and pre-exponential factor for hollycellulose pyrolysis ranged from 4.059 - 48.531 kJ.mo1-1 and from 72.012--1966.463 min-1, respectively. Those for lignin were from 31.264-- 54.091 kJ.mol-1 and from 31.755 - 1909.015 min-1. Elevation of flammability of the 7 fuels are not always identical at four dimensions. Pinus armandii Franch was higher in all four dimensions while Tectona grandis was low at all four dimensions. The rest 5 species go in between with no identical ranking in the four dimension. Lignin content, pre-exponential factor and activation energy might have some influence on flammability but need further investigation yet.

关 键 词：南方典型乔木叶片 热解动力学 燃烧性 热解特征 热重分析 

分 类 号：S762.3[农业科学—森林保护学]