Page 216 - Wastewater Solids Incineration Systems

182 Wastewater Solids Incineration Systems

cover fasteners should be reinstalled immediately following conveyor maintenance.
Gaskets should be inspected and replaced if deteriorated.
Mechanical systems may also be used to convey ash collected in waste heat
boilers, economizers, and baghouses.

3.2.1.2 Pneumatic Conveyance Systems
Pneumatic conveying devices are either pressure- or vacuum-driven. They consist of
airlock equipment—to prevent cross mixing of transport air and air within the incin-
erator on the lower hearths—and may include various combinations of ash coolers,
blowers or vacuum pumps, transporters, conveyance piping, ash bins, ash condi-
tioners, associated drive equipment, and dry dust removal equipment typically of the
baghouse type.
The dilute-phase pressure system (Figure 8.2) uses a positive-displacement or
centrifugal blower to move the air and ash mixture through piping to the storage
bins (Dynamic Air Inc, 2006a). Another type of dilute-phase pressure system

Receiving Bin

Low Pressure
Blower
Rotary
Air Lock

FIGURE 8.2 A typical dilute-phase pressure system for ash handling (courtesy of
Dynamic Air, Inc.).