Upgrading of refuse derived fuel through torrefaction and carbonization: Evaluation of RDF char fuel properties

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Abstract

Refuse derived fuel (RDF) is produced in large amounts but its heterogeneous nature and low calorific value reduce the potential for energetic valorization of this material. In this work, the torrefaction and carbonization of RDF was studied in a temperature range of 200–400 °C and residence times from 15 to 60 min, yielding chars with increased density, high heating value (HHV), carbon content, ash content and fixed carbon. Leaching experiments showed that some inorganic components like calcium or chlorine could be removed from the RDF char, upgrading its fuel quality. For temperatures in the torrefaction range (200 °C and 250 °C), energy yields were higher than 96.3% and process energy efficiencies were higher than 85%, but the HHV of the RDF chars were lower than 19.4 MJ kg−1. In the carbonization range (300 °C to 400 °C) it was possible to obtain RDF chars with HHV in the range of 20.1–26.2 MJ kg−1, with energy yields from 84.5 to 91.7% and process energy efficiencies from 70.8 to 79.2%. The obtained results showed that thermochemical processing can be used to upgrade RDF thus promoting sustainable solutions for its management and valorization.

Original languageEnglish
Pages (from-to)66-76
Number of pages11
JournalEnergy
Volume181
DOIs
Publication statusPublished - 15 Aug 2019

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Refuse derived fuels
Carbonization
Heating
Energy efficiency
Calorific value
Carbon
Chlorine
Coal ash
Leaching
Calcium
Temperature
Processing

Keywords

  • Carbonization
  • Leaching behavior
  • RDF
  • RDF char
  • Torrefaction

Cite this

@article{1950895818094c0fb1741201adf13411,
title = "Upgrading of refuse derived fuel through torrefaction and carbonization: Evaluation of RDF char fuel properties",
abstract = "Refuse derived fuel (RDF) is produced in large amounts but its heterogeneous nature and low calorific value reduce the potential for energetic valorization of this material. In this work, the torrefaction and carbonization of RDF was studied in a temperature range of 200–400 °C and residence times from 15 to 60 min, yielding chars with increased density, high heating value (HHV), carbon content, ash content and fixed carbon. Leaching experiments showed that some inorganic components like calcium or chlorine could be removed from the RDF char, upgrading its fuel quality. For temperatures in the torrefaction range (200 °C and 250 °C), energy yields were higher than 96.3{\%} and process energy efficiencies were higher than 85{\%}, but the HHV of the RDF chars were lower than 19.4 MJ kg−1. In the carbonization range (300 °C to 400 °C) it was possible to obtain RDF chars with HHV in the range of 20.1–26.2 MJ kg−1, with energy yields from 84.5 to 91.7{\%} and process energy efficiencies from 70.8 to 79.2{\%}. The obtained results showed that thermochemical processing can be used to upgrade RDF thus promoting sustainable solutions for its management and valorization.",
keywords = "Carbonization, Leaching behavior, RDF, RDF char, Torrefaction",
author = "Catarina Nobre and C{\^a}ndida Vilarinho and Oct{\'a}vio Alves and Benilde Mendes and Margarida Gon{\cc}alves",
note = "This work was supported by the CITRI, S.A. project I&DT nº 24878; and by the Portuguese Foundation for Science and Technology (grant no. SFRH/BD/111956/2015 ), co-financed by the Operational Program Human Potential and the European Social Fund-European Union.",
year = "2019",
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doi = "10.1016/j.energy.2019.05.105",
language = "English",
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journal = "Energy",
issn = "0360-5442",
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T1 - Upgrading of refuse derived fuel through torrefaction and carbonization: Evaluation of RDF char fuel properties

AU - Nobre, Catarina

AU - Vilarinho, Cândida

AU - Alves, Octávio

AU - Mendes, Benilde

AU - Gonçalves, Margarida

N1 - This work was supported by the CITRI, S.A. project I&DT nº 24878; and by the Portuguese Foundation for Science and Technology (grant no. SFRH/BD/111956/2015 ), co-financed by the Operational Program Human Potential and the European Social Fund-European Union.

PY - 2019/8/15

Y1 - 2019/8/15

N2 - Refuse derived fuel (RDF) is produced in large amounts but its heterogeneous nature and low calorific value reduce the potential for energetic valorization of this material. In this work, the torrefaction and carbonization of RDF was studied in a temperature range of 200–400 °C and residence times from 15 to 60 min, yielding chars with increased density, high heating value (HHV), carbon content, ash content and fixed carbon. Leaching experiments showed that some inorganic components like calcium or chlorine could be removed from the RDF char, upgrading its fuel quality. For temperatures in the torrefaction range (200 °C and 250 °C), energy yields were higher than 96.3% and process energy efficiencies were higher than 85%, but the HHV of the RDF chars were lower than 19.4 MJ kg−1. In the carbonization range (300 °C to 400 °C) it was possible to obtain RDF chars with HHV in the range of 20.1–26.2 MJ kg−1, with energy yields from 84.5 to 91.7% and process energy efficiencies from 70.8 to 79.2%. The obtained results showed that thermochemical processing can be used to upgrade RDF thus promoting sustainable solutions for its management and valorization.

AB - Refuse derived fuel (RDF) is produced in large amounts but its heterogeneous nature and low calorific value reduce the potential for energetic valorization of this material. In this work, the torrefaction and carbonization of RDF was studied in a temperature range of 200–400 °C and residence times from 15 to 60 min, yielding chars with increased density, high heating value (HHV), carbon content, ash content and fixed carbon. Leaching experiments showed that some inorganic components like calcium or chlorine could be removed from the RDF char, upgrading its fuel quality. For temperatures in the torrefaction range (200 °C and 250 °C), energy yields were higher than 96.3% and process energy efficiencies were higher than 85%, but the HHV of the RDF chars were lower than 19.4 MJ kg−1. In the carbonization range (300 °C to 400 °C) it was possible to obtain RDF chars with HHV in the range of 20.1–26.2 MJ kg−1, with energy yields from 84.5 to 91.7% and process energy efficiencies from 70.8 to 79.2%. The obtained results showed that thermochemical processing can be used to upgrade RDF thus promoting sustainable solutions for its management and valorization.

KW - Carbonization

KW - Leaching behavior

KW - RDF

KW - RDF char

KW - Torrefaction

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