摘要
以水稻秸秆(RS)为研究对象,研究了CO_(2)/H_(2)O气氛对其脱挥发分过程中焦产率、结构及其反应性的影响。采用傅里叶红外光谱(FTIR)及拉曼光谱(Raman)对不同条件下制备的RS焦进行表征,阐明不同反应气氛下RS焦的微观化学结构演化规律。采用热重分析仪(TGA)对制备的RS焦的燃烧反应性进行分析,揭示了CO_(2)气氛、H_(2)O气氛与CO_(2)/H_(2)O混合气氛对RS焦微观化学结构演化及反应性的作用机理。结果表明:CO_(2)/H_(2)O气氛下,生物质焦产率随着反应终温升高而降低,且在700℃以上焦产率差异较大;CO_(2)/H_(2)O混合气氛更有利于促进生物质焦中小芳香环系统的消耗和缩聚,CO_(2)和H_(2)O气氛在高温下对生物质焦的反应存在协同作用和竞争关系;制焦温度在700℃以上时,CO_(2)/H_(2)O气氛有助于改善生物质焦的燃烧特性。
With rice straw(RS)as the research object,the effects of CO_(2)/H_(2)O atmosphere on biomass yield,structure and reactivity of RS in the process of volatilization were investigated.Fourier transform infrared spectroscopy(FTIR)and Raman spectroscopy(Raman)were used to characterize the RS char,and the evolution law of the microchemical structure of RS char under different reaction atmospheres was investigated.The combustion reactivity of RS char was analyzed by a thermogravimetric analyzer(TGA),and the effects of CO_(2) atmosphere,H_(2)O atmosphere and CO_(2)/H_(2)O mixture atmosphere on the microstructure evolution and reaction mechanism of RS char were revealed.The results showed that the yield of biomass char decreased with the increase of final reaction temperature in CO_(2)/H_(2)O atmosphere,and the difference of yield of biomass char was obvious when the reaction temperature was above 700℃.CO_(2)/H_(2)O mixture atmosphere was more conducive to the consumption and condensation of the small aromatic ring system of biomass char.CO_(2) atmosphere and H_(2)O atmosphere had a synergistic effect and competitive relation in the reaction of biomass char at high temperature.CO_(2)/H_(2)O atmosphere could improve the combustion characteristics of biomass char when the char-making temperature was 700℃above.
作者
刘亮
李文豪
刘增辉
卿梦霞
赵广民
刘文斌
LIU Liang;LI Wenhao;LIU Zenghui;QING Mengxia;ZHAO Guangmin;LIU Wenbin(School of Energy and Power Engineering,Changsha University of Science and Technology,Changsha 410114,China;Key Laboratory of Renewable Energy Electric-Technology of Hunan Province,Changsha 410114,China)
出处
《环境工程》
CAS
CSCD
北大核心
2023年第4期108-115,共8页
Environmental Engineering
基金
国家自然科学基金项目(52106131)
湖南省教育厅重点项目(21A0201)。
关键词
水稻秸秆
富氧燃烧
生物质焦
化学结构
反应性
rice straw
oxy-fuel combustion
biomass char
chemical structure
reactivity
