2011 International Conference on Alternative Energy in Developing Countries and Emerging Economies
- 114 -
combusted in the gas engine for power generation.
Gasifier efficiency was about 63-81% as given in Table
4-6 and as shown in Fig. 30-32. The optimum size of the
briquette was 3 cm and showed that the composition of
the product gas, i.e., CO, CO
2
and H
2
was lower when the
5 and 7 cm was used [12]. The heating of the product gas
using 5 and 7 cm as the feedrate was also lower
comparing to the use of 3 cm a feedrate. Gasifire
efficiency was performed as the same manner.
The gasification temperature strongly affected the
hydrogen yield. Higher temperature favors hydrogen
production. The steam/biomass ratio was also observed in
the research and the tests showed that the increasing
value of steam/ biomass ratio correspond with an increase
in hydrogen concentration which agreed with the
previous work [14].
TABLE
IV
C
OMPOSITION HEATING VALUE AND EFFICIENCY OF PRODUCT GAS
.
Rice Husk-
Glycerol
Briquette
3 cm
CO
CO
2
H
2
Heating
Value
(MJ/m
3
)
Efficiency
(%)
Air
Injection
1-22
10-19
4
-
14
4.2-4.9
42-49
Steam/Air
Injection
7-26
14-19
4
-
17
4.6-4.9
46-49
Note: %Vol.
TABLE V
C
OMPOSITION HEATING VALUE AND EFFICIENCY OF PRODUCT GAS
.
Rice Husk-
Glycerol
Briquette
5 cm
CO
CO
2
H
2
Heating
Value
(MJ/m
3
)
Efficiency
(%)
Air
Injection
2-18
9-16
3
-
10
4.5-4.8
44-48
Steam/Air
Injection
6-18
17-18
5
-
10
4.2-4.8
46-48
Note: %Vol.
TABLE
IV
C
OMPOSITION HEATING VALUE AND EFFICIENCY OF PRODUCT GAS
.
Rice Husk-
Glycerol
Briquette
7 cm
CO
CO
2
H
2
Heating
Value
(MJ/m
3
)
Efficiency
(%)
Air
Injection
1-18
16-20
1
-
6
4.1-4.8
43-48
Steam/Air
Injection
3-15
16-20
3
-
10
4.2-4.8
44
-
48
Note: %Vol.
Fig. 15. H
2
production from the gasification process using steam/air
injection
(3 cm).
Fig. 16. H
2
production from the gasification process using steam/air
injection
(5 cm).
Fig. 17. H
2
production from the gasification process using steam/air
injection
(7 cm).
Fig. 18. CO production from the gasification process using steam/air
injection
(3 cm).
0
2
4
6
8
10
12
14
16
18
0:00
0:14
0:28
0:43
0:57
Time (min)
Hydrogen (%)
0
2
4
6
8
10
12
0:00
0:14
0:28
0:43
0:57
Time (min)
Hydrogen (%)
0
2
4
6
8
10
12
0:00
0:14
0:28
0:43
0:57
Time (min)
Hydrogen (%)
0
5
10
15
20
25
30
0:00
0:14
0:28
0:43
0:57
TIme (min)
Carbon monoxide (%)
