CO<sub>2</sub>/H<sub>2</sub>O气氛对生物质焦化学结构演化及反应性作用机理研究

刘亮; 李文豪; 刘增辉; 卿梦霞; 赵广民; 刘文斌

doi:10.13205/j.hjgc.202304015

CO₂/H₂O气氛对生物质焦化学结构演化及反应性作用机理研究

doi: 10.13205/j.hjgc.202304015

刘亮^1,2,
李文豪¹,
刘增辉¹,
卿梦霞^1,2, ,,
赵广民¹,
刘文斌¹

1. 长沙理工大学能源与动力工程学院, 长沙 410114;
2. 可再生能源电力技术湖南省重点实验室, 长沙 410114

基金项目:

国家自然科学基金项目(52106131)

湖南省教育厅重点项目(21A0201)

详细信息

作者简介:
刘亮(1967-),男,博士,教授,主要研究方向为煤与生物质高效清洁利用。liuliang_hn@163.com

通讯作者:
卿梦霞(1993-),女,博士,副教授,主要研究方向为煤与生物质高效清洁利用。qingmx@csust.edu.cn

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出版历程
- 收稿日期: 2022-08-30
- 网络出版日期: 2023-05-26
- 刊出日期: 2023-04-01

STUDY ON CHEMICAL STRUCTURE EVOLUTION AND REACTIVE MECHANISM OF BIOMASS CHAR PREPARED IN CO₂/H₂O ATMOSPHERE

1. School of Energy and Power Engineering, Changsha University of Science and Technology, Changsha 410114, China;
2. Key Laboratory of Renewable Energy Electric-Technology of Hunan Province, Changsha 410114, China

摘要

摘要: 以水稻秸秆(RS)为研究对象,研究了CO₂/H₂O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CO₂气氛、H₂O气氛与CO₂/H₂O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:CO₂/H₂O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;CO₂/H₂O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,CO₂和H₂O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,CO₂/H₂O气氛有助于改善生物质焦的燃烧特性。
- 水稻秸秆 /
- 富氧燃烧 /
- 生物质焦 /
- 化学结构 /
- 反应性
Abstract: With rice straw(RS) as the research object, the effects of CO₂/H₂O 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 CO₂ atmosphere, H₂O atmosphere and CO₂/H₂O 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 CO₂/H₂O atmosphere, and the difference of yield of biomass char was obvious when the reaction temperature was above 700 ℃. CO₂/H₂O mixture atmosphere was more conducive to the consumption and condensation of the small aromatic ring system of biomass char. CO₂ atmosphere and H₂O atmosphere had a synergistic effect and competitive relation in the reaction of biomass char at high temperature. CO₂/H₂O atmosphere could improve the combustion characteristics of biomass char when the char-making temperature was 700 ℃ above.
- rice straw /
- oxy-fuel combustion /
- biomass char /
- chemical structure /
- reactivity

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