Biomedical Engineering Reference
In-Depth Information
FIGURE 12.14
Tall grass are cut in the field. They are made into bales and left in the field for
drying. Source: Photograph taken by the author in a countryside in Nova Scotia, Canada.
Crane
From
bale
storage
Shredder and
chopper
Bale feed
system
Gasifier
Straw bale
Ram
feeder
Gas
Pushing ram
FIGURE 12.15
Straw bale handling system for feeding into a straw gasifier.
chopper. However, fuels like rice husk and coffee beans are of a fixed granu-
lar size and so do not need further chopping. Rice husk, a widely used bio-
mass, is flaky and 2
3 mm in size. As such, it can be fed as it
comes from the source, but it can be easily entrained in a fluidized bed. For
this reason, one can press it into pellets using either heat or a nominal binder
in a press.
Feeders for nonharvested fuels are similar to those for conventional fuels
like coal. Speed-controlled feeders take the fuel from the silo and drop mea-
sured amounts of it into several conveyors. Each conveyor takes the fuel to
an air-swept spout that feeds it into the furnace. If the moisture in the fuel is
too high, augers are used to push the fuel into the furnace.
10 mm
3
1
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