升温速率对生物质热解的影响

稻壳、稻秆及麦秆是中国主要的农业废弃物，如何综合、有效地利用这些农业废弃物进行资源化研究显得十分必要。热解是热化学转化中最为基本的过程，是气化、液化及燃烧过程的初始和伴生反应，对热解的分析有助于热化学转化过程控制及高效转化工艺的开发。目前，国内外对生物质及其组分的热解已有大量的研究，但对中国主要的农业废弃物稻壳、稻秆及麦秆的研究较少。本研究利用热重和红外联用技术深入研究了升温速率对三种典型生物质热解气体产物的影响，并对生物质的热解动力学及热解气体产物的析出规律进行实时在线分析。

Effect of heating rate on biomass pyrolysis

The pyrolysis behavior of three typical agricultural residues including rice husk, rice straw and wheat straw, was studied at different heating rates(15℃/min, 40℃/min and 100℃/min) in a dynamic nitrogen flow of 80mL/min by TG analysis coupled with Fourier Transform Infrared Spectroscopy (FT IR). The various gaseous products released during biomass pyrolysis were examined. The kinetic parameters under different heating rates were acquired by kinetics analysis. The correlation coefficients are above 0.99. The results show that as heating rate increases the TG curve shifts to low temperature zone and the peak of DTG curve goes to low temperature area accordingly, but the total weight loss and activation energy of pyrolysis fluctuate little. The releasing behavior of gaseous products during pyrolysis of the three samples is similar. CO, CO2, H2O, CH4 and organics are the main gaseous products during biomass pyrolysis. When the heating rate increases, the yield of gaseous products released increases, so does the releasing rate.