大型海藻绿潮浒苔的热解特性及其催化热解研究

Abstract

以海洋生物质绿潮浒苔为研究对象，并以玉米秸秆(草类生物质)和锯末(木质类生物质)为对比研究对象，采用热重分析得到三种生物质的热解特性。研究结果表明，与玉米秸秆和锯末等典型陆生生物质相比，浒苔的热稳定性最低。采用Coats-Redfern法分别计算该三种生物质的动力学参数，并得到了较可能的几个反应机理函数以及各自活化能数值。并以碳酸钠作为催化剂，用热重分析法分析了三种生物质的热解过程以及催化剂在不同浓度下对其热解效果的影响。其结果表明，Na2CO3能显著降低三种生物质的初始热解温度和最大失重速率所对应的温度。从对初始热解温度和最大失重速率所对应温度的降低程度而言，Na2CO3对陆生生物质锯末和玉米秸秆的催化效果优于对海洋生物质浒苔的催化效果。Pyrolysis characteristics of Enteromorpha prolifera, cornstalk (grass biomass) and sawdust (woody biomass) were investigated with thermogravimetric analysis (TGA) method. The results showed that Enteromorpha prolifera has lower thermostability compared with cornstalk and sawdust. The kinetics parameters including activation energy and the most probable mechanism functions of the three biomasses were calculated by Coats-Redfren method. Moreover, using sodium carbonate as catalyst impregnated biomass, the pyrolysis process of the three kinds of biomass and the effect of the catalyst with different concentrations were studied with thermogravimetric analysis. The results show that sodium carbonate can decrease the initial decomposition temperature and the maximum weight loss temperature. It has a stronger catalytic effect on cornstalk and sawdust on Enteromorpha prolifera as far as the decrease extent of the temperature is concerned.