摘要
文章基于新疆棉秆的微波水热及水热氧化处理实验,利用傅立叶红外光谱分析、Van Soest化学组分分析和热重分析等方法,研究了水热及水热氧化处理对棉秆固相产物结构、组分变化及热解特性的影响规律。研究结果表明:水热处理过程中,棉秆中的半纤维素在温度为200℃时基本完全水解,无定形纤维素在温度为200~230℃时剧烈分解,而木质素与结晶纤维素在温度为160~230℃时保持稳定;随着水热温度的升高,棉秆样品的结晶度、固定碳含量、热值均呈上升趋势,灰分和水分含量则呈下降趋势,综合热解指数在温度为200℃时达到最大值[4.07×10^(-5)%^(3)/(min^(2)·℃^(3))];水热氧化处理过程中,半纤维素在温度为180℃时基本分解完毕,木质素和结晶纤维素在温度为160~230℃时发生部分降解;在水热氧化温度为160~200℃时,棉秆的结晶度升高至最大值后降低;水热氧化处理后棉秆的固定碳含量和热值均高于同温度下的水热处理后棉秆,且综合热解指数在温度为180℃时达到最大值[4.23×10^(-5)%^(3)/(min^(2)·℃^(3))];相比水热处理,水热氧化处理能够促进棉秆中不稳定组分的分解,从而在较低的处理强度下对生物质提质。
Based on the microwave hydrothermal and hydrothermal oxidation treatment experiments of cotton stalk in Xinjiang province,the effects of hydrothermal and hydrothermal oxidation treatment on the structure,composition and pyrolysis characteristics of solid phase products of cotton stalk were studied by Fourier infrared spectroscopy(FT-IR),Van Soest chemical composition analysis and thermogravimetric analysis(DTG).The results showed that the hemicellulose in the cotton stalk was nearly completely hydrolyzed at 200℃,the amorphous cellulose decomposed violently at 200℃to 230℃,and the lignin andcrystalline cellulose remained stable at 160℃to 230℃.With the increase of hydrothermal temperature,crystallinity,fixed carbon content and calorific value of cotton stalk sample all showed an increasing tendency,while ash and moisture content showed a decreasing trend.The comprehensive pyrolysis index reached the maximum value at 200℃reached the maximum value of 4.07×10^(-5)%^(3)/(min^(2)·℃^(3)).In the process of the hydrothermal oxidation treatment process,the hemicellulose was basically decomposed at 180℃,and the lignin and crystalline cellulose were partially degraded at 160℃to 230℃.When the hydrothermal oxidation temperature was 160℃to 200℃,the crystallinity of cotton stalk increased to the maximum value and then decreased.The fixed carbon content and calorific value of cotton stalk after hydrothermal oxidation treatment were higher than those of cotton stalk after hydrothermal treatment at the same temperature.The comprehensive pyrolysis index reached the maximum value at 180℃reached the maximum value of 4.23×10^(-5)%^(3)/(min^(2)·℃^(3)).Compared with hydrothermal treatment,hydrothermal oxidation treatment can promote the decomposition of unstable components in cotton stalk,so as to improve the biomass at a lower treatment intensity.
作者
刘思梦
张守玉
孙梦圆
徐嘉庆
胡南
吴玉新
周义
杨济凡
郎森
Liu Simeng;Zhang Shouyu;Sun Mengyuan;Xu Jiaqing;Hu Nan;Wu Yuxin;Zhou Yi;Yang Jifan;Lang Sen(Schoolof Enery and PowerEngineeringUniversity of Shanghai for Science and Technoogy,Shanghai 20003,China;Schoolof Energy and PowerEngineering,Changchun Institute of Tehnology,Changchun 130012,China;Department of Energy and Power Engineering,Tsinghua University,Beijing 100084,China)
出处
《可再生能源》
CAS
CSCD
北大核心
2023年第10期1279-1286,共8页
Renewable Energy Resources
基金
国家自然科学基金重点国际(地区)合作研究项目(51761125011)
吉林省自然科学基金项目(YDZJ202101ZYTS180)。
关键词
生物质
水热处理
水热氧化处理
热解
微波加热
biomass
hydrothermal treatment
hydrothermal oxidation treatment
pyrolysis
microwave
