Equipment: Part 2
329
Figure 10.3
Atmospheric gas burner.
used for many years in the sewage sludge combustion business, its
application to power and heating boilers is relatively new. The solid
fuel or waste is ground or crushed to a uniform size and then injected
into a combustion bed, usually sand. Air is blown through beneath the
bed, fluidizing the fuel and suspending it above the bed, where pri-
mary combustion takes place. Limestone or some similar material is
mixed with or injected into the fuel, where it absorbs sulfur, thereby
reducing the emission of sulfur compounds. A fabric filter (baghouse)
is required to remove particulates from the process. These systems
require a properly trained and experienced operating staff. The ad-
vantage of the system is the reduced emission of sulfur and nitrogen
compounds.
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