Department of Engineering, University of Perugia, Via G. Duranti 67, 06125 Perugia, Italy.
SINTEF Industry AS, Forskningsveien 1, 0373 Oslo, Norway.
Molecules. 2019 Apr 27;24(9):1657. doi: 10.3390/molecules24091657.
The solid fraction obtained by mechanical separation of digestate from anaerobic digestion plants is an attractive feedstock for the pyrolysis process. Especially in the case of digestate obtained from biogas plants fed with energy crops, this can be considered a lignin rich residue. The aim of this study is to investigate the pyrolytic kinetic characteristics of solid digestate. The Starink model-free method has been used for the kinetic analysis of the pyrolysis process. The average Activation Energy value is about 204.1 kJ/mol, with a standard deviation of 25 kJ/mol, which corresponds to the 12% of the average value. The activation energy decreased along with the conversion degree. The variation range of the activation energy is about 99 kJ/mol, this means that the average value cannot be used to statistically represent the whole reaction. The Master-plots method was used for the determination of the kinetic model, obtaining that n-order was the most probable one. On the other hand, the process cannot be modeled with a single-step reaction. For this reason it has been used an independent parallel reactions scheme to model the complete process.
从厌氧消化厂的消化物中通过机械分离获得的固体部分是热解过程的有吸引力的原料。特别是对于用能源作物喂养的沼气厂获得的消化物，可以将其视为富含木质素的残留物。本研究旨在研究固体消化物的热解动力学特性。已经使用Starink 无模型方法对热解过程进行了动力学分析。平均活化能值约为 204.1 kJ/mol，标准偏差为 25 kJ/mol，对应于平均值的 12%。随着转化率的增加，活化能降低。活化能的变化范围约为 99 kJ/mol，这意味着平均值不能用于统计代表整个反应。使用主图法确定了动力学模型，得出 n 级是最可能的。另一方面，该过程不能用单步反应来建模。因此，已使用独立的平行反应方案来对整个过程进行建模。
