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Ordering fuel
Substances
When buying wood for combustion, it is important to
ensure that the following foreign matter is avoided:
Stones
■
Metal particles
■
■
Masonry remnants
■
Plastics
Foreign matter changes the composition of the fuel
and therefore the critical parameters of the combustion
process.
Chlorine Cl
Sulphur S
Total Cl, S
Ash content, total
Sum of alkali oxides in the ash (K
Na
O)
2
Start of ash sintering (SB)
Note
Avoid foreign matter, such as nails and iron particles,
as such foreign bodies increase the wear of system
parts.
It is imperative that light metals are avoided, as these
will melt in the combustion chamber and lead to faults
in the grate area.
Non-wood biomass fuels
Non-wood biomass fuels such as needles, leaves,
cereals, straw, husks, fruit stones, etc. are unsuitable
as fuels for trouble-free operation, and are therefore
not permitted.
Approved woodchips
Moisture content
Grain size
60
mg/kg
mg/kg
mg/kg
g/kg
O and
g/kg
2
°C
To EN ISO 17225-4
M20
■
M30
■
P16S
■
P31S
■
Observe the following limits per kg of dry fuel or dry
matter content of non-combustible constituents. The
limits for ash were determined at an analysis tempera-
ture of 815 °C. If the specifications are observed, the
minimum temperature at which ash sintering starts is
1000 °C.
Limit
Comparison with natural wood
Max. 300
Max. 1000
Max. 1000
Max. 15.0
Max. 1.0
min. 1000
Exceeding the above limits will shorten the service life
of the combustion chamber and the solid fuel boiler.
This also means a greater amount of maintenance
work and shorter service intervals.
In some cases, the fuel properties (elemental composi-
tion, ash sintering point, etc.) differ considerably from
those of wood. Combustion of such fuels in a solid fuel
boiler can lead to an impairment of the combustion
characteristics. The fireclay lining and the heat
exchanger surfaces will be subject to increased stress.
Warranty claims can therefore only be asserted when
using approved fuels.
To ÖNORM
w20
■
w30
■
G30
■
G50
■
from forests
10
120
130
5.0
0.35
approx. 1200
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