Journal
APPLIED SCIENCES-BASEL
Volume 7, Issue 11, Pages -Publisher
MDPI AG
DOI: 10.3390/app7111189
Keywords
downdraft fixed bed; sewage sludge; degree of torrefaction; chemical exergy; higher heating value; O/C and H/C ratios; torrefaction index
Categories
Funding
- Human Resources Development Program [20154030200940]
- Renewable Energy's Technology Department Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) - Ministry of Trade, Industry and Energy of the Korean Government [20143010101910]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20143010101910] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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A lab-scale downdraft fixed bed reactor was used for the study of sewage sludge, a non-lignocellulosic biomass, torrefaction to enhance the thermochemical properties of sewage sludge. The torrefaction was carried out for a temperature range of 200-350 degrees C and a residence time of 0-50 min. Degree of torrefaction, torrefaction index, chemical exergy, gas analysis, and molar ratios were taken into account to analyze the torrefied product with respect to torrefaction temperature. The effect of torrefaction temperature was very pronounced and the temperature range of 250-300 degrees C was considered to be the optimum torrefaction temperature range for sewage sludge. Chemical exergy, calorific value and torrefaction index were significantly influenced by the change in the relative carbon content resulting in decrease of the O/C and H/C molar ratios.
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