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Component Description
Burn Pot - The coal is burnt in the burn pot with the air supplied through the air ports
and the coal supplied from the coal screw below.
The burn pot is made of cast iron and can be removed by cutting the three metal tags
that are holding it in place with a cutting disc. Access can be gained through the top of
the boiler
Retort - Area surrounding the Burn Pot that supplies the primary air for combustion
Blower - Supplies air for combustion and the smoke-back tube. The blower can be
choked to properly tune the combustion rate of each batch of fuel.
Coal Feed Screw – This is the screw that feeds the fuel from the bottom of the hopper
to the bottom of the Burn Pot. The helix flight is made of 5mm mild steel plate, and
the shaft is made from Ø20mm bright mild steel.
Ash Pan - Removable pan underneath Combustion Chamber that collects the left over
solid products of combustion.
Coal Hopper – The coal hopper can be supplied with the boiler. Standard capacities
are 150 kg for bagged lots, 500 kg or 1,000 kg for trailer loads and 2,000 kg for truck
loads. The hoppers have sloping sides at angles of no less than 50° so that they will
empty fully. The large hoppers have self-supporting legs which must be secured to a
suitable foundation. The large hoppers are constructed to be weather proof with lids,
and are constructed from 3mm mild steel. Coal hoppers must not be constructed from
combustible materials.
Combustion Chamber - Area where the fuel is burnt and initial heat transfer from the
exhaust gases to the water takes place.
Fully Water Jacketed – The combustion area of the boiler is fully water jacketed
with 6mm thick steel. Because the steel in the boiler is cooled by water, the steel does
not become damaged by severe expansion and contraction, so a long operational life
can be expected.
Heat Exchanger Tubes - Tubes where the secondary heat transfer from the exhaust
gases to the water takes place, featuring scrubber coils to maximise heat transfer to the
water.
Scrubber Coils – The scrubber coils are provided to reduce heat coring and increase
efficiency by removing scale from the heat exchanger tube surfaces.
Waterside Corrosion – Once the water in the system becomes stagnant, little
corrosion occurs but a rust inhibitor should still be used to prolong the life of the
boiler.
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