Influence of freeboard temperature, fluidization velocity and particle size on tar production and composition during the air gasification of sewage sludge

Aznar, M. (Universidad de Zaragoza) ; Manyà, J. J. (Universidad de Zaragoza) ; García, G. (Universidad de Zaragoza) ; Sánchez, J.L. (Universidad de Zaragoza) ; Murillo, M. B. (Universidad de Zaragoza)

Resumen: The influence of freeboard temperature, fluidization velocity, and particle size on tar production and composition during the air gasification of dried sewage sludge has been researched using a bench-scale gasifier. Of the operating variables analyzed, the results obtained from a statistical analysis (ANOVA and PCA) indicate that only the freeboard temperature has a significant influence on tar production. The results also show that freeboard temperature is the key factor that influences the tar composition. A high freeboard temperature reduces the amount of tar produced, but the tar compounds obtained are mainly PAH, which could require a more complicated secondary treatment for tar removal. Nevertheless, an increase in the freeboard temperature value implies a substantial increase in both low heating value and cold gas efficiency (6.5% and 10.8%, respectively, when the required freeboard temperature was increased from 873 to 1123 K). Future studies should focus on testing/developing catalytic materials able to degrade (in a secondary treatment) tar with a high content of PAH compounds.

Idioma: Inglés

Año: 2008

Publicado en: Energy and Fuels 22, 4 (2008), 2840-2850
ISSN: 0887-0624

Factor impacto JCR: 2.056 (2008)

Categ. JCR: ENGINEERING, CHEMICAL rank: 18 / 113 = 0.159 (2008) - Q1 - T1
Categ. JCR: ENERGY & FUELS rank: 15 / 66 = 0.227 (2008) - Q1 - T1

Tipo y forma: Article (PostPrint)

Área (Departamento): Área Ingeniería Química (Dpto. Ing.Quím.Tecnol.Med.Amb.)
Área (Departamento): Proy. investigación HKA (Dpto. Ing.Quím.Tecnol.Med.Amb.)
Área (Departamento): Área Tecnologi. Medio Ambiente (Dpto. Ing.Quím.Tecnol.Med.Amb.)