Tennessee Valley Authority
Rail Unloading and Coal Blending System
Kingston Fossil Plant
Harriman, Tennessee
Tennessee Valley Authority awarded Roberts & Schaefer a turnkey
contract to design, supply, install, and commission a rail unloading
and coal blending system at the Kingston Fossil Plant at Harriman,
Tennessee. A 4,400 TPH rail car rapid unloader feeds a 72-inch
coal storage conveyor. The storage conveyor transfers coal to
one of two 62,000-ton piles through a stacking tube, or diverts
it to a transfer conveyor that moves the coal to the other stacking
tube.
Either a 500-2,500 TPH rotary plow feeder or an emergency reclaim
hopper/feeder reclaims coal from each stockpile. Each rotary plow
feeder transfers coal to a reclaim conveyor, which in turn feeds
a crusher feed conveyor. Two 1,200 crushers reduce the material
from 2 inches X 0 inches to 1-1/4 inches X 0 inches. The crushed
coal collects on a 54-inch conveyor and moves to the existing
conveyor system, which sends it to coal bunkers in the powerhouse.
Ancillary systems include fire protection, dust suppression,
sampling, and ventilation systems. All process equipment is controlled
by a distributed control system (DCS).
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