Gasification kinetics of char derived from metallised food packaging plastics waste pyrolysis. (15th January 2022)

• Record Type: Journal Article
• Authors: Yousef, Samy; Eimontas, Justas; Striūgas, Nerijus; Abdelnaby, Mohammed Ali
• Is Part Of: Energy. Volume 239:Part B(2022)
• Publication Date: 2022-01-15
• Subjects: Plastic waste -- Metallised food packaging plastics -- Pyrolysis -- Biochar -- Gasification kinetics -- Kinetic models; Power resources -- Periodicals; Power (Mechanics) -- Periodicals; Energy consumption -- Periodicals; 333.7905
• DOI: 10.1016/j.energy.2021.122070
• Languages: English
• ISSNs: 0360-5442

Abstract

Abstract: This research aims to study the gasification kinetics of char derived from metallised food packaging plastics waste (MFPWs) pyrolysis. The research began with treating char mechanically to obtain uniform char powder (MSRPs) composed of aluminium (Al), undecomposed organic fraction, and carbon particles. Subsequently, the MSRPs sample was treated again chemically to remove Al, thus preparing carbon black particles (BCPs). The chemical composition and morphology of the prepared MSRPs and BCPs samples were determined using elemental and proximate analysis, SEM, and XRD. Meanwhile, thermogravimetric analyser (TGA-DTG) was used to study the thermal stability of MSRPs and BCPs samples in different CO2 /N2 concentrations: 20/80, 25/75, and 30/70 vol%. Once the tested samples stabilized at the target temperature the gasification analysis was started. Finally, gasification kinetics of MSRPs and BCPs samples were investigated using Random Pore Model (RPM) and Hybrid Modified Random Pore Model (HMRPM) based on thermogravimetric results. The proximate results showed that the MSRPs were rich in volatile matter (41.5 wt%), while ash (51.1 wt%) was the major component in the BCPs sample. The TGA-DTG gasification results revealed that MSRPs sample can decompose in three zones with a total weight loss of 45 wt%, while the BCPs samples decomposed linearly with a total weight loss of 22 wt%. The kinetic results showed that Al leaching, gasification temperature, and CO2 /N2 concentrations have a significant effect on prediction of gasification kinetics parameters and deviation of their fitting curves. Highlights: Gasification kinetics of char derived from MFPWs pyrolysis were studied. Thermogravimetric were conducted in the ranges 825–925 °C in CO2 /N2 ambient. Gasification kinetics of un/treated char were investigated using RPM and HMRPM. HMPRM was able to plot dX/dt versus X curves for all conversion regions. Al and temperature have a significant effect on the modelling accuracy and K, ψ, ξ.