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Istituto di ricerche sulla combustione
Soppresso il 01/10/2020

Torna all'elenco Contributi in rivista anno 2020

Contributo in rivista

Tipo: Articolo in rivista

Titolo: Experimental and Numerical Investigation of Biosolid Gasification: Equilibrium-Based Modeling with Emphasis on the Effects of Different Pretreatment Methods

Anno di pubblicazione: 2020

Formato: Cartaceo

Autori: Ashraf Abdelrahim, Paola Brachi, Giovanna Ruoppolo, Simona Di Fraia, Laura Vanoli

Affiliazioni autori: Dipartimento di Ingegneria, Università degli Studi di Napoli "Parthenope", 80143 Napoli, Italy; Istituto di Ricerche sulla Combustione, Piazzale V. Tecchio 80, 80125 Napoli, Italy; Istituto di Ricerche sulla Combustione, Piazzale V. Tecchio 80, 80125 Napoli, Italy; Dipartimento di Ingegneria, Università degli Studi di Napoli "Parthenope", 80143 Napoli, Italy; Dipartimento di Ingegneria, Università degli Studi di Napoli "Parthenope", 80143 Napoli, Italy

Autori CNR:

  • PAOLA BRACHI
  • GIOVANNA RUOPPOLO

Lingua: inglese

Abstract: In the present study, a modified equilibrium model was developed by Aspen Plus to simulate the gasification of biosolids (treated sewage sludge) in an atmospheric fluidized bed reactor (FBR) using air as a gasification agent. The model, which is based on the Gibbs free energy minimization applying the restricted equilibrium method, was calibrated and validated against a set of experimental data obtained in a pre-pilot-scale FBR. The comparison between the simulation results and the experimental data showed satisfactory agreement, in particular, with respect to the content of combustible gases in the syngas and the heating value. The main objective of the work was to assess the impact of different sludge pretreatment methods (i.e., torrefaction, anaerobic digestion, carbonization, hydrothermal treatment, and copelletization of sewage sludge with solid fuels) and the key operating conditions (gasification temperature and equivalence ratio) on both the syngas quality (composition and heating value) and the performance of the gasifier in terms of the carbon conversion efficiency (CCE), syngas yield (YG), and cold gas efficiency (CGE) under the same operating conditions. Global sensitivity analysis was first performed by varying the gasification temperature and the equivalence ratio (ER). Then, the impact of sludge pretreatments was evaluated by changing the sludge composition in the model in line with experimental data from the pertinent literature. Results point out that the torrefaction pretreatment in combination with gasification exhibits promising results in terms of gas quality (i.e., higher H2/CO ratio and lower CO2/CO ratio) and LHV, even though the carbon conversion efficiency (CCE) slightly decreases presumably because of the lower volatile content in the torrefied material with respect to the parent one.

Lingua abstract: inglese

Pagine da: 299

Pagine a: 307

Pagine totali: 9

Rivista:

Industrial & engineering chemistry research American Chemical Society,
Paese di pubblicazione: Stati Uniti d'America
Lingua: inglese
ISSN: 0888-5885

Numero volume: 59

DOI: 10.1021/acs.iecr.9b03902

Referee: Sì: Internazionale

Stato della pubblicazione: Published version

Parole chiave:

  • Sewage sludge
  • FBR
  • Gasification
  • Aspen Plus
  • Torrefaction
  • Pretreatment

Strutture CNR:

 
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