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Kinetic study of Chinese biomass slow pyrolysis: Comparison of different kinetic models

机译：中国生物质慢速热解的动力学研究：不同动力学模型的比较

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The slow pyrolysis of six Chinese biomasses was studied by thermogravimetric experiments. Non-linear square fitting method is used to calculate DTG data. The analysis results show that it is not possible to exactly represent the biomass pyrolysis by a one-step model with different mechanisms. Thus, three-pseudocomponent models were used to simulate the biomass pyrolysis. It was found that the three-pseudocomponent model with n-order kinetics (model II) is more accurate than the model with first-order kinetics (model I). Activation energies of three-pseudocomponents in model II are bigger than the values in model I. It is shown that model II yields the best simulation results, especially with respect to describe accurately the pyrolysis of the first pseudocomponent (hemicellulose) and the last one (lignin). Nevertheless, with regard to a practical utilization, the three-pseudocomponent model with a reaction order of one could be used, because the accuracy to represent biomass pyrolysis is high enough. Unrealistic high values of the reaction order are avoided, and thus this model is more realistic with respect to the chemical interpretation of the reaction order.
机译：通过热重实验研究了六种中国生物质的慢速热解。非线性平方拟合法用于计算DTG数据。分析结果表明，不可能通过具有不同机理的一步模型来精确表示生物质热解。因此，使用三假组分模型来模拟生物质的热解。发现具有n阶动力学的三假组分模型（模型II）比具有一阶动力学的模型（模型I）更精确。模型II中三假组分的活化能大于模型I中的值。表明模型II产生了最佳模拟结果，特别是在准确描述第一个假组分（半纤维素）和最后一个假组分的热解方面（木质素）。然而，就实际应用而言，由于代表生物质热解的精度足够高，因此可以使用反应阶数为1的三假组分模型。避免了反应顺序的不切实际的高值，因此该模型在反应顺序的化学解释方面更为现实。

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