FUNDAMENTAL EXPERIMENTS ON PYROLYSIS AND STEAM GASIFICATION OF PREPROCESSED SEWAGE SLUDGE Ji Hong Moon1, Han A Reum Yu2, Min Sun Park2, Jeung Woo Lee3, Jung Ho Hwang1, Uen Do Lee2,3 †, Chang Sik Choi4, Eun Suk Jang4, Sang Bong Lee5 1 Yonsei University, 50, Yonsei-ro, Seodaemun, Seoul, South Korea 120-749 2 Korea Institute of Industrial Technology, 35-3, Hongcheon, Ipjang, Cheonan, Chungnam, South Korea 330-825 3 University of Science and Technology, 35-3, Hongcheon, Ipjang, Cheonan, Chungnam, South Korea 330-825 4 Institute for Advanced Engineering, 633-2, Baegam, Cheoin, Yongin, Gyeonggi, South Korea 449-863 5 Korea Research Institute of Chemical Technology, 141, Gajeong-ro, Yuseong, Daejeon, South Korea 305-600 Introduction Recently, since a ban on the dumping of raw sewage at sea has been established, proper use of sewage sludge has been received renewed interest. Among many approaches, using it as a fuel is a very promising option which could solve both environmental and energy problems. In this study, pyrolysis and gasification characteristics of the sewage sludge were investigated by using a sludge- derived fuel from a thermal hydrolysis dewatering process. Transient product gas composition and gas yield were monitored during the pyrolysis and gasification of the sewage sludge in a tube furnace reactor. Compare to other fuel & Total gas production [1] Nimit Nipattummakul et al., 2010 [2] Gomez-Barea et al., 2010 Sewage sludge – cumulative gas production Methodology Tube furnace reactor: 1050mm long and 68mm i.d. Carrier gas: N2 1.1 lpm Reactor temp.: 700, 800, 900℃ (isothermal condition) Steam: 400℃, 0.12 g/min/g of biomass THP Reactor Hopper & Mono pump Sewage sludge Organic sludge1ton water content: 80% Separation Anaerobic digestion Solid product Drying & pelletizing Liquid product Analysis (wt%) Sludge Wood This study(THP) Reference Ref. Before With [1] [2] Moist. 81.9 8.1 1.7 8.7 6.4 Ash 3.6 26.1 33.3 39.4 0.3 V.M. 14.0 58.4 43.6 47.3 75.9 F.C. 0.5 7.5 21.4 4.7 17.4 C 52.7 56.6 69.3 54.3 50.9 H 6.5 8.3 4.5 7.7 5.4 N 9.4 2.3 8.4 0.0 O 33.2 24.7 22.2 27.4 43.7 S 1.0 1.1 2.1 0.006 Conclusion As temperature increases, product gas yield is higher than liquid or solid product. In devolatilization stage, H2 and CH4 composition are higher compare to woody biomass since less oxygen content in sewage sludge. In char reaction stage, H2 yield is higher with increasing temperature since char gasification reaction is more active with temperature. If regulating the residence time and reaction conditions, syngas composition and yield could be controlled. The results are very important to design biomass gasification process and the sewage sludge is considered sustainable fuel for biomass gasification process. Result Sewage sludge – gas composition Wood – gas composition Reference [1] Nipattummakul N, Ahmed I, Kerdsuwan S, Gupta AK. High temperature steam gasification of wastewater sludge. Applied Energy 2010; 87: 3729-3734 [2] Alberto Gomez-Barea, Susanna Nilsson, Fernando Vidal Barrero, Manuel Campoy. Devolatilization of wood and wastes in fluidized bed. Fuel Processing Technology 2010; 91: 1624-1633 Anknowledgement This study was supported by the project “Development of BTL diesel production/utilization technology from biomass” funded by the Korea government Ministry of Strategy and Finance. The 4th International Conference on Applied Energy, ICAE2012, July 5-8, 2012, Suzhou, China