Abstract
Pyrolysis, one of the key thermochemical conversion technologies, is very promising to obtain char, oil and combustible gases from solid fuels. Kinetic modeling is a crucial method for the prediction of the solid conversion rate and analysis of the pyrolysis process. We recently developed a new statistical model for the universal description of solid fuel decomposition, which shows great potential in studying solid fuel pyrolysis. This paper demonstrates three essential applications of this new model in the analysis of Artemisia apiacea pyrolysis, i.e., identification of the conversion rate peak position, determination of the reaction mechanism, and evaluation of the kinetics. The results of the first application show a very good agreement with the experimental data. From the second application, the 3D diffusion-Jander reaction model is considered as the most suitable reaction mechanism for the description of Artemisia stem pyrolysis. The third application evaluates the kinetics of Artemisia stem pyrolysis. The evaluated kinetics vary with the conversion degree and heating rates, in which the activation energies and pre-exponential factors (i.e., lnA vs. Ea) show a linear relationship, regardless of the conversion and heating rates. Moreover, the prediction of the conversion rate using the obtained kinetics shows an excellent fit with the experimental data.
Highlights
Equation (8) is the universal expression we recently developed for the solid fuel pyrolysis of the first-order reaction model [19]
Three applications based on the new model are demonstrated: identification of the conversion rate position, determination of the reaction mechanism, and evaluation of the activation energies
Based on the assumed first-order reaction model, the identified conversion peak temperature showed a negligible difference compared to the experimental data
Summary
Biomass as the fourth largest primary energy resource shows great potential in sourcing the energy needs from renewables [1]. As reported by the International Energy Agency (IEA), bioenergy has the potential to provide 10% of the primary energy supply to the world by 2035, and biofuel will be capable to covering 27% of transportation fuel consumption by 2050 [2]. Thermochemical conversion technologies, as the key method to convert bioresources to energy and renewable products, have drawn more and more attention over the past decades [3,4]. Among thermochemical conversion technologies (i.e., pyrolysis, gasification, combustion, etc.), pyrolysis, which is a significant stage of combustion and gasification and an independent key thermal conversion technology, presents great potential to produce high-quality renewable fuels [5,6]
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