full2011_inter.pdf - page 117

2011 International Conference on Alternative Energy in Developing Countries and Emerging Economies
- 117 -
Fig. 31. Gasifier efficiency from the gasification process using air
injection (5 cm).
Fig. 32. Gasifier efficiency from the gasification process using air
injection (7 cm).
IV. CONCLUSIONS
The H 2/CO ratio in the synthesis gas varied from air
and air/steam was 0.5 to 0.8. Production of hydrogen
from the biomass gasification process is another
alternative. In this research, an experimental investigation
of a downdraft gasifier using air/steam rice husk-glycerol
briquette under various operating conditions, producing a
hydrogen syngas with a high calorific value in the range
of 4.2-4.9 MJ/m3 , the hydrogen yield in the range of 3-
17%.
The gasifier conversion efficiency was 44-49% and the
gasifier using air agent, rice husk-glycerol briquette under
various operating conditions, producing a hydrogen
syngas with a high calorific value in the range of 4.1-4.9
MJ/m3 , the hydrogen yield in the range of 1-18% and the
gasifier conversion efficiency was 42-49%.
The gasifier power generation system consumed
biomass fuel at around 50 kg/h or 5 kg/kWh. Gasifier can
generate gas at around 74.5 m3/h. The composition of the
product gas, i.e., CO, CO2 and H2 were lower when the air
was used as a gasifying agent. The heating of the product
gas using air as a gasifying agent was also lower
compared to the use of steam as a gasifying agent. Using
the steam as the gasifying agent, the gas compositions
were composed of CO2 approx 14-20%Vol., and CO
approx 3-26%Vol. While using the steam as gasifying
agent, CO was 8-16%Vol., and CO2 was 0-21%Vol. The
efficiency conversion efficiency and heating production
was relatively low from the gasifier production supplies
of biomass performance appropriate was 70-75% [11,
13].
ACKNOWLEDGMENT
The authors would like to thank the Thailand Research
Fund and Thaksin University for the financial support.
REFERENCES
[1] Lim, M.T. and Zainal Z.A.. Bubbling fluidized bed
biomass gasification-performance, process findings
and energy analysis, Vol. 33. Renewable Energy,
2008, pp. 2339-2343.
[2] Wander, P.R., C.R. Altafini and Barreto R.M..
Assesment of a small sawdust gasification unit, Vol.
27. Biomass Bioenergy, 2004, pp. 467-476.
[3] Pratik, N.S. and Babu B.V.. Experimental studies on
producer gas generation from wood waste in a
downdraft biomass gasifier, Vol. 100. Bioresour.
Technol, 2009, pp. 3127-3133.
[4] Garcia-Bacaicoa, P., R. Bilbao, J. Arauzo and
Salvador M.L.. Scale up of moving bed gasifier (25-
300kg/h)-design, experimental aspects and results,
Vol. 48 Bioresour. Technol, 1994, pp. 229-235.
[5] Zainal, Z.A., A. Rifau, G.A. Quadir and Seetharamu
K.N.. Experimental investigation of a downdraft
biomass gasifier, Vol. 23. Biomass Bioenergy,
2002, pp. 283-289.
[6] Jain, A.K. and Goss J.R.. Determination of reactor
scalling factors for throatless rice husk gasifier,
Vol. 18. Biomass Bioenergy, 2000, pp. 249-256.
[7] Sharma, A.K.. Experimnetal study on 75kWth
downdraft biomass gasifier system, Vol. 34.
Renewable Energy, 2009, pp. 1726-1733.
[8] Patel, S.R., P.R. Bhoi and A.M. Sharma, Field-
testing of SPRERIhs open core gasifier for thermal
application, Vol. 30. Biomass Bioenergy, 2006, pp.
580-583.
[9] Cao, Y., Y.Wang, J. Rieley and W.. A novel biomass
air gasification process for producing tar-free higher
heating value fuel gas. Fuel Processing Technology,
4 April 2005.
[10]Slapak, M. J., van Kasteren J. M., Drinkenburg A.A..
Design of a process for steam gasification of PVC
waste. Resources, Vol. 30. Conservation and
Recycling, 2000, pp. 81-93.
[11]FAO Forestry Department. Wood Gas as Engine
Fuel, Mechanical Wood Products Branch Forest
Industries Division, United Nations, 1986, pp. 8-18.
[12]Anil K. Rajvanshi. Biomass Gasification., Vol. II.,
Alternative Energy in Agriculture, 1986, pp. 83-102.
[13]McKendry, P.. Energy Production from Biomass,
Conversion Technologies, 2001.
[14]Ningbo Gao, Aimin Li, Cui Quan, Fan Gao..
Hydrogen-rich gas production from biomass steam
gasification in an updraft fixed-bed gasifier
combined with a porous ceramic reformer , Vol. 33.
International Journal of Hydrogen Energy, 2008, pp.
5430–5438.
73
74
75
76
77
78
79
80
81
0:00 0:14 0:28 0:43 0:57
Time (min)
Gasifier Efficiency (%)
50
55
60
65
70
75
80
85
90
95
100
0:00 0:14 0:28 0:43 0:57
Time (min)
Gasifier Efficiency (%)