Parrillo, F;
Ardolino, F;
Calì, G;
Pettinau, A;
Materazzi, M;
Sebastiani, A;
Arena, U;
(2024)
Plastic waste gasification using oxygen-enriched air and steam: Experimental and model results from a large pilot-scale reactor.
Waste Management
, 183
pp. 53-62.
10.1016/j.wasman.2024.04.045.
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Abstract
Advanced thermochemical technologies for plastic waste valorization represent an interesting alternative to waste-to-energy options. They are particularly appealing for waste-to-hydrogen and waste-to-chemicals applications, with autothermal steam-oxygen gasification in fluidized bed reactors showing the greatest market potential. The study describes a series of experimental tests carried out on a large pilot-scale fluidized bed gasifier, using steam and O2-enriched air, with increasing fractions of oxygen. Different values of the main operating parameters are varied: equivalence ratio (0.22–0.25), steam-to-carbon ratio (0.7–1.13), and steam-to-oxygen ratio (up to 3.2). The fuel consists of real mixed plastic waste coming from separate collection of municipal solid wastes. The data obtained are used to investigate in depth the role of the main operating parameters and to improve and validate a recently developed one-dimensional kinetic model for waste gasification. The validation shows a good agreement between experimental data and model results, suggesting the reliability of the model to predict the reactor behavior under conditions of pure steam-oxygen gasification, relevant to many industrial applications. It has been found that the equivalence ratio is the parameter that most affects the syngas composition. At a constant equivalent ratio, the molar fraction of oxygen in the enriched air shows a limited influence on syngas composition while the steam is crucial in controlling the temperature along the reactor. Provided that the steam-to-carbon molar ratio is larger than 1.5, steam affects mainly the reactor temperature rather than the syngas composition, qualifying the steam-to-oxygen molar ratio as an instrumental parameter for smooth plant operation.
| Type: | Article |
|---|---|
| Title: | Plastic waste gasification using oxygen-enriched air and steam: Experimental and model results from a large pilot-scale reactor |
| DOI: | 10.1016/j.wasman.2024.04.045 |
| Publisher version: | http://dx.doi.org/10.1016/j.wasman.2024.04.045 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Plastic waste, Chemical recycling, Thermochemical conversion, Gasification, Pilot plant, Fluidized bed |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10192720 |
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