Beercontroloffuelquanty. The small
size of the pellets allows for precise fuel
feeding. On the other hand, the supply
of air for reaching opmal combuson
eciency is easier to adjust since the
fuel quanty in the combuson chamber
remains constant and predictable.
Fuel eciency. High combuson
eciency is also determined by
consistently low moister content of
pellets (consistently under 10% as
opposed to 20% to 60% moisture content
of the logs). Low moisture content,
controlled fuel porons and precise air
seng means high combuson eciency
and very low carbon oxides in the ue
gases.
Table 2. European Certification of Wood Pellets for Heating Purposes
Parameters Units ENplus-A1 ENplus-A2 EN-B
Diameter mm
6 (± 1)
8 (± 1)
6 (± 1)
8 (± 1)
6 (± 1)
8 (± 1)
Lenght mm 15 ≤ L ≤ 40
1)
15 ≤ L ≤ 40
1)
15 ≤ L ≤ 40
1)
Bulk dentsity kg / m
2
≥ 600 ≥ 600 ≥ 600
Caloric/heang value MJ / kg ≥ 16,5-19 ≥ 16,3-19 ≥ 16,0-19
Humidity /moisture Ма .-% ≤ 10 ≤ 10 ≤ 10
Dust Ма .-% ≤ 1
3)
≤ 1
3)
≤ 1
3)
Mechanical durability Ма .-% ≥ 97,5
4)
≥ 97,5
4)
≥ 96,5
4)
Ash Ма .-%
2)
≤ 0,7 ≤ 1,5 ≤ 3,5
Melng point of ash °C ≥ 1200 ≥ 1100 -
Chlorine content Ма .-%
2)
≤ 0,02 ≤ 0,02 ≤ 0,03
Sulfur content Ма .-%
2)
≤ 0,03 ≤ 0,03 ≤ 0,04
Nitrogen content Ма .-%
2)
≤ 0,3 ≤ 0,3 ≤ 1,0
Copper content mg / kg
2)
≤ 10 ≤ 10 ≤ 10
Chromium content mg / kg
2)
≤ 10 ≤ 10 ≤ 10
Arsenic content mg / kg
2)
≤ 1,0 ≤ 1,0 ≤ 1,0
Cadmium content mg / kg
2)
≤ 0,5 ≤ 0,5 ≤ 0,5
Mercury content mg / kg
2)
≤ 0,1 ≤ 0,1 ≤ 0,1
Plumbum content mg / kg
2)
≤ 10 ≤ 10 ≤ 10
Nickel content mg / kg
2)
≤ 10 ≤ 10 ≤ 10
Zinc content mg / kg
2)
≤ 100 ≤ 100 ≤ 100
1) Not more than 1% of the pellets may be longer than 40 mm, max. Length 45 mm;
2) Dry weight;
3) Particles <3.15 Mm, particulate matter, before handing over the goods;
4) Measurements with lignotester limit value ≥ 97,7% by weight.