Ariterm Biomatic+ - Wood Pellets as Fuel; Fuel Recommendations and Storage

ARITERM SWEDEN AB • ARITERM OY • Asennus ja käyttöohje • Installation och driftanvisning • Installation and operating instruction • 19.11.2009 • 22/32
Wood pellets are renewable bioenergy and provide fuel in a compact and uniform form, which
is easy to handle. e moisture content is less than 10%, which means that the pellets do not
freeze or become mouldy. No chemical substances are used in the manufacturing process. In-
stead, the binding agent is the tree’s own lignin.
e pellet diameter is 6 to 12 mm and the length is 10 to 30 mm. Due to their small size, the
pellets move freely in the feeding augers.
NOTE!
The burner has been adjusted for 8 mm pellets at the factory. If pellets of other sizes are used, the
burner must be readjusted..
Most of the disturbances that occur as a result of bad fuel quality are caused by incorrect han-
dling and intermediate storage before the product is delivered to the customer. Large contents
of fine materials may be due to insufficient sifting. Ash sintering is often caused by silicate
impurities (sand). ese materials cannot be detected before burning. NOTE! If the ash is sin-
tered, all sintered material must be continuously removed from the burner head.
Fuel storage
anks to the feeding system, it is possible to build the pellet store for so-called bulk deliveries.
e store can be placed either inside or in a separate building outside the house. e shorter
the transport distance from the store to the burner, the better the feeding system functions.
Fire regulations must be taken into consideration when designing the boiler room and the stor-
age area.
e entire store must be insulated with extreme caution in order to prevent dust from spread-
ing.
e pellet delivery methods must be taken into account when choosing the store size. In gen-
eral, the pellets can be obtained in small sacks (20 kg), large sacks (500 kg) or directly to the
store by means of a blower truck. One tonne of pellet fuel requires about 1.6 m3 of storage
space. e smallest delivery batch for loose pellets is three tonnes. A store of 8 to 10 cubic me-
tres is a reasonable solution for many houses and involves lower delivery costs.
WOOD PELLETS AS FUEL
Fuel recommendation
Raw material Chemically untreated, barkless wood
Diameter 8 mm
Length 15-32 mm
Volume weight over 600 kg/m
3
Moisture content less than 10%
Ash content less than 0.7 weight %
Fine material content max 4 weight %
Ash melting temperature
>
1,100 °C
Energy content
>
4.75 kWh/kg