海藻的热解特性分析

用热重分析法对一种海洋生物质--海藻类植物江蓠的热解过程及其动力学规律进行了研究。分析了样品在不同升温速率(10、20、30℃/min)和不同粒径(0.18、0.28、0.45 mm)下的实验结果，发现样品的非等温失重过程由脱水、保持、剧烈失重和缓慢失重4 个阶段组成,结合傅里叶红外光谱分析了样品热解过程的主要成分变化，比较了各升温速率下的热解特性参数，并计算出热解产物释放指数r; 随着升温速率的增加，热解反应越容易进行。当粒径小于0.45 mm时，时, 颗粒粒径对热解过程影响不大。用Coats-Redfern方法计算出样品的热解动力学参数,发现其热解反应机理函数不同于木质类生物质，求得的活化能E与频率因子A之间存在动力学补偿效应。

Analysis on Pyrolysis Characteristics of Seaweed

The pyrolysis characteristics and kinetics of Gracilaria cacalia (a sort of seaweed) belonging to a marine biomass were studied by using the thermogravimetric analysis method, and the experimental results obtained at different heating rates (10, 20, 30℃/min) and particle sizes (0.18, 0.28, 0.45mm) were analyzed. It was found that the non-isothermal weight-loss process of samples is composed of dehydration, holding, rapid weight-loss and slow weight-loss. The changes of the main components of sample were analysed by Fourier transform infrared spectrum (FTIR). The characteristic parameters of pyrolysis at different heating rates were compared, and the releasing index of pyrolysis was calculated as well, showing that the higher the heating rate, the quicker the pyrolysis reaction. The effect of particle size on the pyrolysis is negligible when particle size is less than 0.45mm. The kinetic parameters were calculated by using the Coasts-Redfern method, indicating that the reaction function of pyrolysis mechanism is different from the woody biomass. The kinetic compensation effect exists between the activation energy and the frequency factor.