Fuel Features; Wood In Pellet Form - Olivieri ERGOFLAM IDRO Installation Instructions Manual

1.4

Fuel features

The main feature of this heater is that it burns a natural fuel (the pellet) obtained
in an environmentally-friendly way from scraps of the timber industry (wood
chippings, sawdust, etc.).
Wood chippings and sawdust from wood products, after having been duly
recleaned and dried, are compacted in state-of-the-art very high-pressure
plants, into pure rounded wood pieces: the pellet. Each rounded piece can
have variable lengths and thicknesses, respectively between 1÷3 cm in length
and 6÷8 mm in diameter. The pellet's main features are low moisture content
(below 12%), its high density (=600 kg/m
compactness that give this type of fuel characteristics of high calorific power
(I.C.P. 4000÷5000 kcal/kg).
Figure 1.1: Wood in pellet form.
The pellet to be used to feed the heater must have high quality characteristics
such as, those defined by standards DIN 51731 and ÖNORM M 7135, some basic
details of which we set out below.
Quality standard for Unit of

wood in pellet form

measurement
Diameter Mm
Length Mm
Density Kg/dm3
Moisture Content %
Ashes %
Calorific Power Kwh/kg
Sulphur %
Nitrogen %
Chlorine %
Powders % weight
Binding agents % of pressed mass
Not more than 20% of the pellet may have a length greater than 7.5 times its diameter D.
1
The DIN prohibits the use of any added substance. However, this prohibition is not valid for small
2
heating systems.
DIN plus proposes the combination of the qualitative parameters proposed by
standard DIN 51731 and by Austrian standard Önorm M 7135.
0 as well as its regularity and
3
Onorm M7135 DIN 51731
from 4 to 10 from 4 to 10
5 x D1 < 50
>1,12 1,0 /1,4
< 10 < 12
< 0,50 < 1,50
> 5 4.86 / 5.42
< 0,04 < 0,08
< 0,3 <0,3
< 0,02 <0,03
<2,3 -
<2 2
DIN plus
from 4 to 10
5 x D1
> 1,12
< 10
< 0,50
>5
< 0,04
<0,3
<0,02
<2,3
<2
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