Título:	Thermo-acoustic catalytic effect on oxidizing woody torrefaction
Autor(es):	Silveira, Edgar Amaral Galvão, Luiz Gustavo Oliveira Macedo, Lucélia Alves de Sá, Isabella A. Chaves, Bruno Sant'Anna Morais, Marcus Vinícius Girão de Rousset, Patrick Caldeira-Pires, Armando de Azevedo
ORCID:	https://orcid.org/0000-0003-4800-4513 https://orcid.org/0000-0003-4809-5291
Assunto:	Torrefação Biomassa Termoacústica Catálise Modelagem numérica
Data de publicação:	28-Out-2020
Editora:	MDPI
Referência:	SILVEIRA, Edgar A. et al. Thermo-acoustic catalytic effect on oxidizing woody torrefaction. Processes, v. 8, n. 11, 1361, 2020. DOI: https://doi.org/10.3390/pr8111361. Disponível em: https://www.mdpi.com/2227-9717/8/11/1361/htm. Acesso em: 12 jan. 2021.
Abstract:	The torrefaction (mild pyrolysis) process modifies biomass chemical and physical properties and is applied as a thermochemical route to upgrade solid fuel. In this work, the catalytic effect of thermo-acoustic on oxidizing woody torrefaction is assessed. The combined effect of two acoustic frequencies (1411, 2696 Hz) and three temperatures (230, 250, and 290 °C) was evaluated through weight loss and its deviation curves, calculated torrefaction severity index (TSI), as well as proximate, calorific, and compression strength analysis of Eucalyptus grandis. A new index to account for the catalytic effects on torrefaction (TCEI) was introduced, providing the quantitative analysis of acoustic frequencies influence. A two-step consecutive reaction numerical model allowed the thermo-acoustic experiment evaluation. For instance, the thermogravimetric profiles revealed that the acoustic field has a catalytic effect on wood torrefaction and enhances the biomass oxidation process for severe treatments. The kinetic simulation of the acoustic coupling resulted in faster conversion rates for the solid pseudo-components showing the boosting effect of acoustic frequencies in anticipating hemicellulose decomposition and enhancing second step oxidizing reaction.
Licença:	© 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
DOI:	https://doi.org/10.3390/pr8111361
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