以CO2和干空气为动态气氛，在10, 20, 30℃/min三种升温速率下进行热重实验，研究了气氛对压缩木屑颗粒热解反应的影响，用Netzsch Thermokinetics 3软件确定了失重曲线第2失重阶段的反应级数，用Coats?Redfern积分法计算了第2失重阶段的动力学参数，用气相色谱分析了放大实验在升温速率10℃/min下产生的热解气体成分. 结果表明，在CO2和干空气气氛下，随温度升高，木屑颗粒均出现3个失重阶段，第2阶段的失重分别为65.97%和56.31%，热解反应级数分别为1.2和1.0，活化能分别为117.73和87.4 kJ/mol，指前因子分别为5.8?106和1.1?104 min?1. 与空气气氛相比，CO2气氛下裂解气中CH4产量相对较低，而H2和CO产量较高.
To explore the effect of atmosphere on the pyrolysis reaction of compressed wood chips particles, the thermo-gravimetric experiments with carbon dioxide and dry air as the dynamic gases under heating rates of 10, 20, 30℃/min were conducted by using synchronous thermal analyzer. Aiming at the second mass loss stage of thermo-gravimetric curves, the software of Netzsch Thermokinetics 3 was used to analyze the reaction orders, and Coats?Redfern method was used to calculate the kinetic parameters. Moreover, gas chromatography was applied to determine the composition of pyrolysis gases produced from enlarged experiment of thermo-gravimetric experiment at the heating rate of 10℃/min. The results showed that there are 3 weightless stages in the heating process of wood particle under these two kinds of atmosphere. In carbon dioxide and dry air, the second stage weight loss were 65.97% and 56.31%, the thermal decomposition reaction series were 1.23 and 1.0, the activation energies of this pyrolysis phase were117.73 and 87.4 kJ/mol, and the pre-exponential factor were 5.8×106 and 1.1×104 min?1, respectively. In the pyrolysis gases, the concentration of methane is lower in carbon dioxide than in dry air, while hydrogen and carbon monoxide are higher.
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