Pyrolysis study of a waste plastic mixture through different kinetic models using isothermal and nonisothermal mechanism

Das, Prasanta

doi:10.1039/d4ra04957h

RSC Adv.

2024

DOI: 10.1039/d4ra04957h

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Pyrolysis study of a waste plastic mixture through different kinetic models using isothermal and nonisothermal mechanism

Prasanta Das

Abstract: We report the solid fuel WPM (Waste Plastic Mixture) characterization, the physico-chemical properties of the pyrolytic oil, and the pyrolysis investigation of WPM using several kinetic models.

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2024

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Particle-resolved simulation of the pyrolysis process of a single plastic particle

Zhang,

Tavakkol,

Galeazzo

et al. 2024

Heat Mass Transfer

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Particle-resolved simulations have been performed to study the pyrolysis process of a high-density polyethylene (HDPE) particle in an inert hot nitrogen flow. The simulations resolve the velocity and temperature boundary layers around the particle, as well as the gradients of temperature and concentration within the particle. The objective of this work is to gain an in-depth understanding of the effect of particle morphology-specifically, the particle size and shape-on the interplay between heat transfer and pyrolysis progress, as well as to assess the applicable particle size when using the Lagrangian concept for simulating plastic pyrolysis. In all simulation cases, the pyrolysis reaction is initiated at the external surface of the particle, where the particle is heated the fastest. The reaction front propagates inward toward the core of the particle until it is fully pyrolyzed. For particle diameters larger than 4 mm, distinct temperature gradients within the particle can be detected, leading to a temperature difference of more than 10 K between the core and the external surface of the plastic particle. In this case, the Lagrangian simulations yield a considerably slower conversion compared with the particle-resolved simulations. Moreover, the cylindrical particle in longitudinal flow has been found to be pyrolyzed more slowly compared with the spherical and shell-shaped particles, which is attributed to the enhanced heat transfer conditions for the cylindrical particle. The results reveal the importance of considering particle morphology when modeling plastic pyrolysis. In addition, the Lagrangian approach, which assumes particle homogeneity, is only applicable for particle diameters smaller than 2 mm when modeling plastic pyrolysis.

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Particle-resolved simulation of the pyrolysis process of a single plastic particle

Zhang,

Tavakkol,

Galeazzo

et al. 2024

Heat Mass Transfer

View full text Add to dashboard Cite

show abstract

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Pyrolysis study of a waste plastic mixture through different kinetic models using isothermal and nonisothermal mechanism

Abstract: We report the solid fuel WPM (Waste Plastic Mixture) characterization, the physico-chemical properties of the pyrolytic oil, and the pyrolysis investigation of WPM using several kinetic models.

Cited by 1 publication

References 73 publications

Particle-resolved simulation of the pyrolysis process of a single plastic particle

Particle-resolved simulation of the pyrolysis process of a single plastic particle

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