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| sawdust briquette and its charcoal briquette |
The dimensions of
briquettes and pellets are distinguished because of its size. Pellet diameter
size less than 25 mm, while the briquettes is more than 25 mm. In contrast to
wood pellets that have only one kind of shape that is cylindrical, biomassbriquette has a variety of shapes such as cylindrical, hexagonal, and beams. In
addition to the commercial side of the biomass briquette production process is
based on grouped into two: first,
piston / ram type are made with a piston or mechanical press with high
pressure, while the screw-type with screw extruder made the biomass experiencing
continuous extrusion with the heated die. In the ram / piston press wear of
machine contact with the biomass smaller than the screw extruder. Energy
consumption for the ram / piston type is also smaller than the screw extruder
type. But in terms of quality and production procedures, screw extruder type superior than superior to
the piston press technology. The presence of a hole in the middle of the screw
type briquette making more uniform and efficient combustion and also the type
briquette can be carbonized into charcoal briquette. Comparison between the two
kinds of biomass briquette as in the table below:
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| ram type sawdust briquette |
A. Ram / Piston Press Technology
-Friction between
biomass by means of relatively small, so it can be reduced machine wear.
-The moisture content
of the raw material should be made less than 12% for the best results.
- Carbonization on the outer layer
is not possible, so the briquette is rather fragile.
B. Screw Extruder Technology
-Continuous output
and briquette out with a uniform size.
-The outer layer of briquette
is partially carbonized so making it easier ignition and combustion. This layer
also protects from moisture surrounding air.
-Middle hole in the briquette
help the combustion because the air supply becomes sufficient.
-Machine or equipment
operates very soft without any shock load.
- Machine or equipment is also
lighter than the ram / piston press in the absence of reciprocating parts and
flywheel.
-Machine components
and lubricants used in the machine free from dust or contamination of raw
materials.
-High energy
consumption compared to the ram / piston press.
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| Converting oil burner furnace with biomass briquette |
At this time screw
extruder and ram / piston press technology became commercially important. Ram
/ piston press technology is older than the screw extruder technology, so
that more units ram / piston press in operation today. But the development of
a screw extruder also fast which is predicted in the next few years the
production of biomass briquette screw type also jumped sharply. Resume of
applications of biomass briquette screw type can be seen here.
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