Environmental Engineering Reference
In-Depth Information
Table 5 Result of the laboratory scale test
Air
ow rate (Nm
3
/h)
fl
Producer gas composition
(vol%)
Lower heating value
(MJ/Nm
3
)
CO
CH
4
H
2
CO
2
Shredded-RDF
12
2.92
0.87
2.04
6.22
0.89
18
4.39
2.17
3.71
8.05
1.73
24
5.38
4.61
3.51
7.30
2.71
Dense-RDF
18
7.62
1.69
8.23
9.78
2.46
21
6.64
3.91
6.79
10.16
2.99
value varied from 0.89 to 2.71 MJ/Nm
3
, which was considered to be very low for
further used in the dual fuel engine-generator. The improvement of fuel charac-
teristics was carried out by the densi
cation step, as describe in Sect.
2.2.1
. After
fuel improvement, it can be observed that the dense-RDF provided the higher
heating value of producer gas compared to shredded-RDF. The lower heating value
of producer gas from dense-RDF ranged from 2.46 to 2.99 MJ/Nm
3
and reached the
maximum value of 2.99 MJ/Nm
3
at the air
flow rate of 21 Nm
3
/h. Although the test
fl
flow rate of 24 Nm
3
/h, the gasi
was conducted at the air
fl
cation process occurred
unstably. Therefore,
the analysis of producer gas at
this
fl
ow rate was not
considered.
3.2 Up-Scaling of a Prototype Scale Downdraft Gasi
er
The test laboratory indicated that dense-RDF provided the higher heating value of
producer gas than shredded-RDF; hence, only dense-RDF was used as feedstock in
the up-scaling of a prototype scale downdraft gasi
er. The experimental results for
a prototype scale downdraft gasi
er are shown in Table
6
.
From Table
6
, the producer gas from the prototype scale downdraft gasi
er had
the higher heating value compared to the test in the laboratory scale downdraft
Table 6 Result of the prototype scale test
Air
ow rate (Nm
3
/h)
fl
Producer gas composition
(vol%)
Lower heating value
(MJ/Nm
3
)
CO
CH
4
H
2
CO
2
Dense-RDF
73
9.95
0.49
6.88
9.84
2.13
85
14.99
0.47
10.40
7.31
3.12
101
14.44
1.20
6.41
8.51
2.86
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