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P a g e
2.2. Quality requirements for pellets fuel
In table below given requirements as to quality of pellet fuel are shown. Using fuel which complies
to
DIN 51731
or
DIN PLUS
certification or meet the rules of EN-14961-2 norm, extends
longevity of burner. The pellet storage location should be dry and well-ventilated. It is important
that before the hopper filling the pellet temperature is equal to the boiler room temperature.
Table 1. Quality requirements of pellet fuel.
Wooden pellet
Units
NORM
Quality criteria
DIN plus
DIN 51731
Diameter
mm
4≤d<10(6)
4≤d<10(6)
Length
mm
5 x D(3)
<50
Density
kg/dm³
1,12
1,0< Density <1,4>
Ash
%
<0,5(1);(7)
<1,50
Humidity
%
<10
<12
Humidity when delivered
%
Not specified
Not specified
Caloric value
MJ/kg
>18(1)
17,5<HW<19,5(2)
Sulphur
%
<0,04(1)
<0,08
Nitrogen
%
<0,3(1)
<0,3
Chlorine
%
<0,02(1)
<0,03
Dust collected
%
<2,3
-
Additives facilitating
pressing
%
<2(8)
(4)
Temperature of melting
ash
-
Not specified
Not specified
Arsenic
mg/kg
<0,08
<0,08
Lead
mg/kg
<10
<10
Cadmium
mg/kg
<0,5
<0,5
Chrome
mg/kg
<8
<8
Copper
mg/kg
<5
<5
Quicksilver
mg/kg
<0,05
<0,05
Zink
mg/kg
<100
<100
Halogens
mg/kg
<3
<3
(1)
Dry weight
(2)
Free from water and ash
(3)
No more than 20% of pellets can be as long as 7,5 x diameter
(4)
DIN forbids to use additives. This ban is not valid to small heating systems.
(5)
In warehouse of the producer
(6)
Tolerance in differences in diameter 10 %
(7)
Allowed content of dust up to 0,8%, if it is naturally higher, specific for given sort of wood
(8)
Only natural additives from biomass are allowed
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