Pyrolysis and Gasification of a Real Refuse-Derived Fuel (RDF): The Potential Use of the Products under a Circular Economy Vision

• Published in: Molecules (Basel, Switzerland) Vol. 27; no. 23; p. 8114
• Main Authors: Alfè, Michela, Gargiulo, Valentina, Porto, Michele, Migliaccio, Renata, Le Pera, Adolfo, Sellaro, Miriam, Pellegrino, Crescenzo, Abe, Abraham A, Urciuolo, Massimo, Caputo, Paolino, Calandra, Pietro, Loise, Valeria, Rossi, Cesare Oliviero, Ruoppolo, Giovanna
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 22-11-2022; MDPI
• Subjects: Air pollution; Bed material; Calorific value; Carbon; Catalytic cracking; Chemical engineering; Chemical engineering research; Chemical properties; Circular economy; Emissions; Emissions control; Energy; Energy recovery; Energy sources; Environmental aspects; Fluidized beds; Garbage; Gasification; Incineration; Moisture content; Municipal solid waste; Municipal waste management; Pollutants; Pollution control; product yields; Pyrolysis; pyrolysis products; Raw materials; Reactors; Recycling; Refuse as fuel; Refuse derived fuels; Refuse Disposal - methods; refuse-derived fuel; Solid Waste; Solid waste management; Solid wastes; Sustainability; Synthesis gas; Waste products as fuel; Waste to energy; Water content; waxes; Italy; product yields; pyrolysis; gasification; waxes; char; syngas; refuse-derived fuel; pyrolysis products
• ISSN: 1420-3049; 1420-3049
• DOI: 10.3390/molecules27238114

Refuse-Derived Fuels (RDFs) are segregated forms of wastes obtained by a combined mechanical-biological processing of municipal solid wastes (MSWs). The narrower characteristics, e.g., high calorific value (18-24 MJ/kg), low moisture content (3-6%) and high volatile (77-84%) and carbon (47-56%) contents, make RDFs more suitable than MSWs for thermochemical valorization purposes. As a matter of fact, EU regulations encourage the use of RDF as a source of energy in the frameworks of sustainability and the circular economy. Pyrolysis and gasification are promising thermochemical processes for RDF treatment, since, compared to incineration, they ensure an increase in energy recovery efficiency, a reduction of pollutant emissions and the production of value-added products as chemical platforms or fuels. Despite the growing interest towards RDFs as feedstock, the literature on the thermochemical treatment of RDFs under pyrolysis and gasification conditions still appears to be limited. In this work, results on pyrolysis and gasification tests on a real RDF are reported and coupled with a detailed characterization of the gaseous, condensable and solid products. Pyrolysis tests have been performed in a tubular reactor up to three different final temperatures (550, 650 and 750 °C) while an air gasification test at 850 °C has been performed in a fluidized bed reactor using sand as the bed material. The results of the two thermochemical processes are analyzed in terms of yield, characteristics and quality of the products to highlight how the two thermochemical conversion processes can be used to accomplish waste-to-materials and waste-to-energy targets. The RDF gasification process leads to the production of a syngas with a H
/CO ratio of 0.51 and a tar concentration of 3.15 g/m
.