Environmental Engineering Reference
In-Depth Information
LHV
producer gas
Q
producer gas
LHV
fuel
m
fuel
g
gasifier
¼
100
%
ð
3
Þ
where
ciency. LHV
fuel
and m
fuel
are the lower heating
value (MJ/kg) and weight (kg) of all fuel used in each experiment, respectively.
Since the engine-generator for power production was connected for the feasibility
study of 200 h test run, the overall efficiency for power production should be consider.
In this study, the overall ef
g
gasifier
is the cold gas ef
ciency for power production was determined by Eq.
4
.
P
LHV
fuel
m
fuel
g
overall
¼
100
ð
4
Þ
%
where
ciency for power production. P is the electrical
power output from the engine-generator. In this study, the power production was
kept constant at 24 kW.
Since the engine operated in the dual fuel mode, the diesel replacement rate (DR)
was taken into account. Equation
5
expressed the diesel replacement.
g
overall
is the overall ef
DR =
Q
d
;
o
Q
d
;
d
Q
d
;
o
100
ð
5
Þ
%
where Q
d,o
and Q
d,d
are the volume
flow rate of diesel consumption in case of using
pure diesel and in case of using dual fuel (l/h), respectively.
The solid fuel consumption rate per a unit of power production (SCR in kg/kWh)
is the amount of solid fuel consumed for 1 kWh power production and it was
calculated by Eq.
6
.
fl
m
fuel
P
SCR
¼
ð
6
Þ
time
where time is the experimental time for each experiment.
3 Results and Discussion
3.1 Characteristic of Producer Gas in a Laboratory Scale
Downdraft Gasi
er
From the study of the characteristic of producer formation in a laboratory scale, it
can be found that shredded-RDF and dense-RDF has a potential to produce the high
heating value producer gas. Table
5
shows the result of the laboratory test.
From Table
5
, the producer gas composition (at the stable condition as average
value) depended on the air flow rate supplied into the gasifier, consequently, lower
heating value of producer gas. For the test with shredded-RDF, the lower heating
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