Environmental Engineering Reference
In-Depth Information
Fig. 2 a Shredded mined MSW, b Extruded mined MSW, and c RDF
2.2.2 Experimental Setup
In the
first step of this study, the RDF gasi
cation experiments were carried out in a
10 kg/h laboratory scale downdraft gasi
er in order to study characteristic of
producer gas formation. A 10 kg/h laboratory scale downdraft gasi
er system
consists of a downdraft gasifier, air blower, air preheater, and gas-cleaning unit, as
shown in Fig. 3 .
After studying the characteristic of producer gas formation behavior, the accu-
mulated 200 h of experiments on a prototype scale downdraft gasi
cation system
was conducted for the feasibility of up-scaling. The gasi
cation system consists of a
50 kg/h batch type downdraft gasi
er, a shell and tube heat exchanger, a gas-
cleaning system, and a internal combustion engine-generator, as presented in Fig. 4 .
The downdraft gasi
er; the
fuel hopper, the reaction zone, and the ash discharging zone. A shell and tube heat
exchanger was applied in order to preheat the air supplied into the reaction zone for
the gasi
er is separated in three zones along the height of gasi
cation process. The gas-cleaning system consisted of a cyclone, a venturi
scrubber, and dust removal unit. The internal combustion engine-generator was a 4
stroke diesel engine with 4 cylinders and could produce 50 kW of electricity, 380/
400 V, and 50/60 Hz.
2.2.3 Experimental Procedure
In order to study the characteristic of producer gas formation in a laboratory scale
downdraft gasi
er for
ignition purpose. After some part of coal was ignited and the combustion process
occurred, approximately 8
cation, 2 kg of lignite coal was
first introduced into gasi
10 kg of either shredded-RDF or dense-RDF was fed
into gasifier and then air was supplied into reaction zone of downdraft gasifier as
gasi
-
flow rate of 12, 18, and 21 Nm 3 /h for shredded-RDF
and 18, 21, and 24 Nm 3 /h for dense-RDF. RDF was ignited and the gasi
cation agent at constant
fl
cation
process started. During the gasi
cation process, the samples of producer gas were
taken for producer gas analysis.
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