Ash handling equipment in stoker
boiler is one of parts on ash handling system in a power plant unit. Ash is the product of coal combustion in stoker boiler. It should be discharged to
maintain well combustion in the furnace.
There are some ash handling
equipment are installed in stoker boiler such ash chute hopper, air plenum hopper,
ash cooler, ash conveyor, and the equipment of ash handling can be
mechanically, hydraulically, and pneumatically.
Bottom ash from the travelling
grate is discharged through the ash chute hoppers installed at the end side of
travelling grate as shown in Figure 1. The manual sliding damper is installed at
each bottom of the air plenum hoppers. The air plenum damper should be opened
minimum once per day to exhaust the riddling ash. And opening interval should
be adjusted according to the condition of the quantity of riddling ash. Before
open the damper, wheelbarrow should be prepared under the damper.
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Figure 1: Traveling Grate Ash Handling Equipment |
Fly ash collected at fly ash
hopper at the bottom of tubular air pre-heater and multi cyclone that discharge
by butterfly damper and rotary damper accordingly as shown in Figure 2.
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Figure 2: Fly Ash Handling Equipment |
Fly ash from boiler bank hopper
and economizer hopper that contains un-burned coal dust is blown in by
secondary air fan into the furnace to burn completely as shown in Figure 3.
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Figure 3: Fly Ash Re-Injection System |
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