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Ordering fuel
Wood fuel constituents
When procuring wood for combustion in a
Vitoligno 300-S, ensure that foreign objects (e.g.
stones, metal parts, pieces of brick, plastics, etc.) are
avoided. Any one of these would change the composi-
tion of the fuel and therefore the critical parameters of
the combustion process.
Chlorine Cl
Sulphur S
Total Cl, S
Ash content total
Alkali oxides in the ash (K
SB (start of sintering) of ash
Exceeding the above limits will shorten the service life
of the combustion chamber and the solid fuel boiler.
This also means that the amount of maintenance work
increases and shorter service intervals.
Influence of the moisture content
The rated boiler heating output is only achieved with
dry wood with maximum 20 % water content (air-dried
wood). Wood of poorer quality and higher moisture
content also reduces the rated heating output and the
length of combustion.
Storage and drying of wood
Wood requires 1 to 2.5 years to dry naturally and
reach a moisture content of 20 - 25 %.
Standard values for storage:
Storage period
Over a summer
Over several years
Information on storing firewood
■
Split all round logs that have a diameter of 10 cm or
more. Enlarging the surface area enables the wood
gases to be expelled more quickly and simply. The
drying process is also accelerated during storage.
■
Stack the split logs in a ventilated and preferably
sunny spot underneath a rain canopy.
Stack the split logs with generous gaps in-between.
■
This allows moisture to be dissipated by the air flow.
54
mg/kg
mg/kg
mg/kg
g/kg
O and Na
O)
g/kg
2
2
°C
Moisture content of fuel
Approx. 30 % moisture content
Approx. 15 % moisture content
The values must not exceed or fall below the following
limits (per kg of dry fuel) for the non-combustible con-
tent (ash at an analysis temperature of 815 °C):
Limit
max. 300
max. 1000
max. 1000
max. 15.0
max. 1.0
min. 1000
The proportion of dust-like and fine-grained materials
should also be minimised (in accordance with
EN ISO 17225-4).
When using softwood (e.g. spruce), note that the
energy per volume unit is lower than with hardwood
(e.g. beech). Softwood is therefore well suited for initial
heat-up – however, the intervals between recharging
are considerably shorter and the volume required is
greater (up to 44 %).
■
Hardwood: 2 to 2.5 years
Softwood: 1 to 1.5 years
■
■
Provide a gap underneath the wood pile (e.g. by
using support timbers) to allow the moist air to
escape.
Never store freshly cut wood in a cellar, as air and
■
sunshine are required for drying. Once dried, the
wood can however be stored in a well ventilated cel-
lar.
Comparison with natural
wood from forests
120
130
0.35
approx. 1200
10
5.0
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