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利用热重–红外联用技术(thermogravimetric-Fourier transform infrared spectroscopy,TG-FTIR)研究稻壳生物油的燃烧过程。基于平行反应模型理论,使用多峰高斯拟合方法分析不同升温速率下稻壳生物油的失重速率曲线,并对燃烧各阶段释放的物质进行红外分析。结果表明,生物油燃烧的失重速率曲线可以描述为6个高斯函数峰的叠加。前3个拟合峰对应轻质有机物的挥发,第4个拟合峰对应重质有机物的分解和缓慢氧化,最后2个拟合峰对应二次焦炭的燃烧。升温速率的提高影响各拟合峰所占份额,加剧生物油挥发,减少二次焦炭生成,但仅对最后2个拟合峰的动力学参数有明显影响。最后结合多峰高斯拟合结果和红外分析结果提出稻壳生物油燃烧模型。
The combustion process of rice husk bio-oil was studied by thermogravimetric-Fourier transform infrared spectroscopy (TG-FTIR). Based on the parallel reaction model theory, the multi-peak Gaussian fitting method was used to analyze the weight loss rate curves of rice husk bio-oil under different heating rates. Infrared analysis was also conducted on the substances released from each stage of combustion. The results show that the weight loss rate curve of bio-oil combustion can be described as the superposition of six Gaussian function peaks. The first three fitting peaks correspond to the volatilization of light organic matter, the fourth fitting peak corresponds to the decomposition and slow oxidation of heavy organic matter, and the last two fitting peaks correspond to the combustion of the secondary coke. The increase of heating rate affected the share of each fitting peak, exacerbated the volatilization of bio-oil and reduced the formation of secondary coke, but only had obvious influence on the kinetic parameters of the last two fitting peaks. Combined with multi-peak Gaussian fitting results and infrared analysis results, the combustion model of bio-oil in rice husk was proposed.