【摘要】 采用TGA-DTA联用测定生物质油的热失重曲线,用Achar微分法和Coats-Redfern积分法计算了挥发和热分解的活化能,并结合Satava法和Bagchi法确定热分解机理函数,得到了生物质油精制前后的非等温动力学方程。推断出热分解过程分别为三级反应和三维扩散3D反应,动力学方程分别为dα/dt=0.5Ae-E/RT(1-α)3和dα/dt=1.5Ae-E/RT(1-α)4/3[(1-α)-1/3-1]-1。实验表明,精制后的生物质油较精制前挥发的活化能降低了很多而热解活化能提高了很多,相应地,精制后的生物质油的挥发性和热稳定性都提高了很多。更多还原

【Abstract】 Thermal weight loss curves of bio-oil were determined by the analytical method of TGA-DTA. Based on the experimental data, activation energies were calculated and the most probable mechanism functions were worked out, and therefore, non-isothermal kinetic equations were finally obtained, dα/dt=0.5Ae^-E/RT（1-α）³ and dα/dt=1.5Ae^-E/RT（1-α）^4/3[（1-α）^-1/3-1]^-1, to describe respectively the thermal decomposition behaviour of the bio-oil, directly from pyrolysis and through the subsequent （upgrading）. Experiment show that for activation energies of volatilization, the upgraded bio-oil is higher than the bio-oil directly from pyrolysis, whereas for activation energies of thermal decomposition, the （upgraded） one is lower than the direct one. Accordingly, volatility and thermal stability for the upgraded bio-oil are improved.更多还原