水稻秸秆成型燃料热解特性试验研究

The Experimental Study on Pyrolysis Characteristics of Rice Straw Briquette Fuel

秸秆是我国最主要的生物质资源,对其进行热解是将生物质能转换为高效高品位清洁能源的最有效措施之一。利用热重分析方法对水稻秸秆及木屑成型燃料热解特性及其动力学规律进行了研究,分析了试样以不同升温速率在氩气气氛下进行热解的试验结果。结果表明:水稻秸秆成型燃料热解过程划分为三个重要阶段,即预热解、快速热解和慢速热解阶段;热解最大速率会随着热解升温速率的升高而增大,有利于热解进行,但会造成反应不彻底等问题,因此温升速率不宜过高;通过对比两种成型燃料的热解性能得到,木屑成型燃料的热稳定性优于水稻秸秆成型燃料;对水稻秸秆成型燃料热解进行动力学参数计算得到:活化能和指前因子会随着升温速率的升高而增大,线性拟合系数均在0.99之上,说明主反应阶段符合一级反应模型。

Stalk is a very important biomass resource in China. Pyrolysis is one of the most effective measures to transform biomass energy into clean energy with high quality. This paper studied on pyrolysis characteristics and dynamics laws of rice straw and wood chip＇pellets by thermogravimetric analysis method. The paper also analyzed the experimental results under different heating rates condition with the high pure Ar as protecting gas. The results showed that rice straw briquette fuel pyrolytic process was divided into 3 phases namely preheating stage,fast pyrolysis stage and slow pyrolysis stage. Pyrolysis maximum rate increased with the rising of pyrolysis heating rate,which was beneficial for pyrolysis,but it caused incomplete reaction,so the temperature rise rate should not be too high. By comparing the performance of the 2 kinds of pellets,sawdust pellet＇s stability was better than that of rice straw briquette fuel. Through calculating kinetic parameters of the rice straw pellets,activation energy and pre-exponential factor increased with the rising of heating rate,and linear fitting coefficients were all above 0. 99,showing that the main reaction stage are in line with the first order reaction model.