1. 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
2 Korea Institute of Industrial Technology, 35-3, Hongcheon, Ipjang, Cheonan, Chungnam, South Korea
3 University of Science and Technology, 35-3, Hongcheon, Ipjang, Cheonan, Chungnam, South Korea
4 Institute for Advanced Engineering, 633-2, Baegam, Cheoin, Yongin, Gyeonggi, South Korea
5 Korea Research Institute of Chemical Technology, 141, Gajeong-ro, Yuseong, Daejeon, South Korea
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:
[2] Alberto Gomez-Barea, Susanna Nilsson, Fernando Vidal Barrero, Manuel Campoy. Devolatilization of wood and wastes in fluidized bed. Fuel Processing Technology 2010; 91:
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