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ENERGY
SAVINGS
Air is the medium that conveys micronized coal to the kiln from an MSI micronization
mill, just as it is for any conventional coal pulverizer. Since this air is
relatively cool as it enters the kiln, energy is required to heat it up to
the kiln's internal temperature. Depending on the process application, this
temperature can range from 1,500 -to- as high as 2,400 degF. However, the
quantity of transport (i.e., conveyance) air necessary to transport micronized
coal from an MSI mill is a fraction of that of a conventional coal pulverizer.
Based on mass-energy balance comparisons between conventional coal and micronized
coal, theoretic reductions of fuel input can range from 10 to 20 percent,
since less mass flow of air requires less energy for its temperature rise.
FLAME
SHAPE
A specialty MSI booster fan is designed to overcome pressure losses experienced
in the transport pipe and burner. Depending on the kiln process, most pressure
loss is typically in the burner d ue to high exiting velocities. However,
this high velocity creates a very desirable long "pencil-shaped" flame for
most kiln applications.
"RING"
FORMATION
A long "pencil-shaped" flame can result in secondary cost benefits by reducing
"ring" formation within a kiln, depending on the process application. This
savings can be significant and relates to a reduction in costs associated
with "shooting-the-ring" (e.g., less shotgun shells, manpower, and "wear-and-tear"
on the kiln's interior walls).
