Environmental Engineering Reference
In-Depth Information
gasi
er. The maximum lower heating value of producer gas of 3.12 MJ/Nm
3
was
achieved at the air
flow rate of 85 Nm
3
/h.
fl
3.3 Accumulated 200 h Operation in a Prototype
Scale Gasi
er
The preliminary test in a prototype scale gasi
er (Sect.
3.2
) indicates that the test in
a prototype scale can obtain the higher heating value of producer gas than the test
in laboratory scale. To study the effect of operating condition on power production
in the long-term run, the accumulated 200 h test was performed. In this test run, the
composition of producer gas, its lower heating value, and the cold gas ef
ciency
were considered as the gasi
cation performance; at the same time, the engine-
generator performance, for example diesel replacement rate, fuel consumption rate
for a unit of power production and the overall power production ef
ciency were
taken into consideration. Table
7
presents the operating conditions for each run.
The different weight ratio of dense-RDF to wood chip of 50:50 was applied to
test no. 1 to 10, 75:25 for test no. 11 to 17 and 100:0 for test no. 18. After
performing the test no. 1 and 2, it was found that 60 kg of charcoal cannot provide
suf
ciently high temperature for the combustion process in the combustion zone of
Table 7 Operating condition for the accumulated 200 h test run
Test
no.
Operating
hour (h)
Dense-RDF
(kg)
Wood chip
(kg)
Charcoal
(kg)
Air
ow rate
(Nm
3
/h)
fl
1
10
100
100
60
73.48
2
10
116
116
60
74.89
3
10
75
75
70
74.89
4
10
75
75
70
101.74
5
10
75
75
70
90.43
6
7
75
75
70
84.78
7
7
75
75
70
62.17
8
8
75
75
70
96.08
9
6
75
75
70
96.08
10
9
75
75
70
96.08
11
9
112.5
37.5
70
73.48
12
12.5
150
50
70
73.48
13
10
114
38
70
73.48
14
14
183.75
61.25
70
73.48
15
10
135
45
70
73.48
16
23
285
95
70
73.48
17
15
187.5
62.5
70
73.48
18
20
284.5
0
100
73.48
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