Influence of Freeboard Temperature, Fluidization Velocity, and Particle Size on Tar Production and Composition during the Air Gasification of Sewage Sludge

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• 作者：Mar&#xed ; a Aznar ; Joan J. Many&#xe0 ; Gorka Garc&#xed ; a ; Jos&#xe9 ; L. S&#xe1 ; nchez ; M. Benita Murillo
• 刊名：Energy & Fuels
• 出版年：2008
• 出版时间：July 2008
• 年：2008
• 卷：22
• 期：4
• 页码：2840 - 2850
• 全文大小：994K
• 年卷期：v.22,no.4(July 2008)
• ISSN：1520-5029

文摘

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.