Environmental Engineering Reference
In-Depth Information
In-Depth Performance Evaluation of RDF
from Landfill Reclamation for Green
Electricity Generation in a Downdraft
Gasier
Somrat Kerdsuwan and Krongkaew Laohalidanond
Abstract Land
ll reclamation is one of the possibilities to reclaim land resources
and recover energy hidden in garbage into green and renewable energy. This study
aims to conduct a feasibility study of using waste reclaimed from old land
ll, called
mined Municipal Solid Waste (mined MSW), for power generation in a 50 kW
downdraft gasi
cation system and to optimize its operating conditions. Waste
reclaimed from dumpsite in Phuket municipality, southern part of Thailand, consists
of mostly plastic fraction and has a higher heating value of 28.68 MJ/kg. In this
study, waste reclaimed is
first solar dried and cut into small size before using as
loose-RDF in 10 kg/h downdraft gasi
cation process to study the gasi
cation
flow rates of 12, 18, and 21 Nm
3
/h
were carried out, and it was found that the heating value of producer gas from
loose-RDF ranged from 0.89 to 2.71 MJ/Nm
3
which was considered to be very low
for further use in diesel engine for power generation. Hence, the densi
process. Three experiments with different air
fl
cation of
RDF was performed in order to improve the RDF properties. After densi
cation
process, three experiments of dense-RDF gasification with different air flow rates of
18, 21, and 24 Nm
3
/h were repeated again. The results indicated that by using
dense-RDF, the heating value of producer gas increased to 2.46
2.99 MJ/Nm
3
and
-
flow rate of 21 Nm
3
/h, the
producer gas has the maximum heating value and maximum cold gas ef
the cold gas ef
ciency reached 43.26
56.22 %. At the air
fl
-
ciency.
Although dense-RDF can produce the higher heating value of producer gas and can
achieve the higher cold gas ef
ciency, it consumed more energy in preparation
process which was accounted for 0.12 kWh per dense-RDF 1 kg. For the experi-
ments in a 50 kg/h prototype scale downdraft gasi
er, dense-RDF was gasi
ed with
flow rates of 73, 85, and 101 Nm
3
/h. It was found that the
maximum heating value of producer gas of 3.12 MJ/Nm
3
was achieved at the air
fl
three different air
fl
flow rate of 101 Nm
3
/h. After passing through gas-cleaning process, the producer
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