Pyrolysis and CO2 gasification of barley straw: Effect of particle size distribution and chemical composition

Gil, Antonia (Universidad de Zaragoza) ; Pallarés, Javier (Universidad de Zaragoza) ; Arauzo, Inmaculada (Universidad de Zaragoza) ; Cortés, Cristóbal (Universidad de Zaragoza)

Resumen: We evaluate how the heterogeneity of the precursor may affect pyrolysis and CO2 gasification behavior aimed at activated carbon applications. Barley straw, ground and classified into five size ranges, is characterized by non-isothermal thermogravimetry tests at various heating rates. Fixed carbon and volatile matter contents decrease with particle size. Also, the finest fraction is enriched in minerals by exogenous contamination and accumulation of silicon-rich leaves. Faster pyrolysis kinetics are found for small sizes, caused by their higher alkali contents and heat-mass transfer rates. Char-CO gasification conversion rates show an unexpected behavior, not previously reported. Higher reactivity is found for the finest fraction, decreasing significantly at temperatures beyond 750 °C. The high alkali content of the finest fraction promotes the catalytic effect of minerals on gasification reactivity at lower temperatures, hindering the reaction at higher temperatures by forming low-melting-point potassium silicates. Results help improve pretreatment strategies to enhance activated carbon quality.

Idioma: Inglés

DOI: 10.1016/j.powtec.2023.118539

Año: 2023

Publicado en: Powder Technology 424 (2023), 118539 [17 pp.]
ISSN: 0032-5910

Factor impacto JCR: 4.5 (2023)

Categ. JCR: ENGINEERING, CHEMICAL rank: 44 / 170 = 0.259 (2023) - Q2 - T1

Factor impacto CITESCORE: 9.9 - Chemical Engineering (all) (Q1)

Factor impacto SCIMAGO: 0.97 - Chemical Engineering (miscellaneous) (Q1)

Financiación: info:eu-repo/grantAgreement/ES/MICINN/RTI2018-095349-A-I00

Tipo y forma: Article (Published version)

Área (Departamento): Área Máquinas y Motores Térmi. (Dpto. Ingeniería Mecánica)