林产化学与工业2018，Vol.38Issue(1)：93-100,8.DOI:10.3969/j.issn.0253-2417.2018.01.014
基于等转化率法的芒草和玉米秸秆热解特性及动力学研究
Pyrolysis Characteristics and Kinetics of Chinese Silvergrass and Corn Stalk Based on Iso-conversional Methods
摘要
Abstract
The pyrolysis characteristics of Chinese silvergrass and corn stalk at different heating rates(5,10,20 and 40℃/min) were studied by thermogravimetric analysis. Pyrolysis kinetics were studied using Kissinger-Akahira-Sunose(KAS), Starink and Ozawa integration method. The TG and DTG curves demonstrated that the pyrolysis process of Chinese silvergrass and corn stalk could be divided into 4 stages:dehydration stage,transition stage,main pyrolysis stage and carbonization stage. Along with the increase of heating rate,the pyrolysis curves moved to the high temperature side, and the rate of weight loss increased, which indicated that the increase of heating rate could promote the pyrolysis reaction. The results of pyrolysis of Chinese silvergrass showed that the correlation coefficients of the three methods were more than 0.9,and the values of activation energy calculated by KAS and Starink methods were very close to each other, but the activation energy calculated by Ozawa method was lower. The activation energy of corn stalk pyrolysis obtained by Ozawa method was the highest,followed by that of Starink method and KAS method. The activation energies of Chinese silvergrass pyrolysis obtained by three methods fluctuated obviously with the increase of conversion rate in the whole pyrolysis process, which showed that a series of complex chemical reactions occurred in the pyrolysis process. When the conversion rates were 0.1-0.4,the activation energy of corn stalk pyrolysis increased sharply;but when the conversion rates were 0.4-0.8,the activation energy of corn stalk pyrolysis decreased slowly until it reached a plateau. The conversion rates of 0.1-0.3,0.3-0.7 and 0.7-0.8 corresponded to the main pyrolysis stage of hemicellulose, the main pyrolysis of cellulose, and the main pyrolysis stage of lignin, which indicated that the pyrolysis difficulty degree of the three components in Chinese silvergrass was the order of lignin>cellulose>hemicellulose.关键词
生物质/热解动力学/等转化率法/热解特性Key words
biomass/pyrolysis kinetics/iso-conversional method/pyrolysis characteristics分类
化学化工引用本文复制引用
姚灿,田红,覃静萍,刘正伟,胡章茂..基于等转化率法的芒草和玉米秸秆热解特性及动力学研究[J].林产化学与工业,2018,38(1):93-100,8.基金项目
国家自然科学基金项目资助(51276023,51406016) （51276023,51406016）
湖南省教育厅优秀青年项目资助(16B001) （16B001）
