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A
d
– ash contents, dry basis
, [%];
DU
– mechanical durability
, [%];
The approval of the new EU standard for wood pellets (EN 14961-2)
was at mid 2010 and introduces new certificates ENplus for pellets,
utilized in domestic heating appliances, the certificate EN-B is applied
for industrial boilers. The standard ENplus defines classes of the wood
pellets, which could be considered as qualifications: А1 and А2. The
class А1 introduces the most stringent limits for the ash content in the
wood pellets. The class А2 defines ash content up to 1.5%. For
industrial applications the wood pellets should cover the requirements of the certificate EN-B,
which is less stringent, that the previous and the generally the quality of the pellets is lower.
Parameter
Dimension
ENplus-A1
ENplus-A2
Diameter
mm
6 (± 1)
6 (± 1)
Length
mm
3,15 ≤ L ≤ 40
1)
3,15 ≤ L ≤ 40
1)
Bulk density
kg/m³
≥ 600
≥ 600
Calorific value
MJ/kg
≥ 16.5
≥ 16.5
Moisture
%
≤ 10
≤ 10
Dust
%
≤ 1
3)
≤ 1
3)
Mechanical durability
%
≥ 97.5
4)
≥ 97.5
4)
Ash
%
2)
≤ 0,7
≤ 1.5
Ash melting temperature
°C
≥ 1200
≥ 1100
Chlorine
%
2)
≤ 0.02
≤ 0.03
Sulphur
%
2)
≤ 0.05
≤ 0.05
Nitrogen
%
2)
≤ 0.3
≤ 0.5
Copper
mg/kg
2)
≤ 10
≤ 10
Chromium
mg/kg
2)
≤ 10
≤ 10
Arsenic
mg/kg
2)
≤ 1
≤ 1
Cadmium
mg/kg
2)
≤ 0.5
≤ 0.5
Mercury
mg/kg
2)
≤ 0.1
≤ 0.1
Lead
mg/kg
2)
≤ 10
≤ 10
Nickel
mg/kg
2)
≤ 10
≤ 10
Zink
mg/kg
2)
≤ 100
≤ 100
1) no more that 1% of the wood pellets could be longer that 40 mm, the max. length is 45mm;
2) determined on dry basis;
3) particles <3.15 mm, fine dust particles, before fuel delivery;
4) for measurements, performed with Lignotester the limit value ≥ 97.7 weight based %;
Table 2.5
European standard for wood pellets ENplus;
