3 Mode of operation – Fuel quality requirements
27
(filter technology) may be necessary for complying with the dust
emission values according to the 1st Federal Emission Control Ordi-
nance (2nd stage).
W
OOD
PELLETS
Wood pellets are pressed into a cylindrical shape. They consist of un-
treated shavings and sawdust from the wood processing industry as
well as unprocessed forestry waste. They have a standardised diam-
eter and length. They are pressed at a very high pressure and have a
very low water content. The energy contained in 2 kg of pellets corre-
sponds approximately to the energy contained in a litre of heating
oil.
Essential criteria for the definition of the property classes are the
length and diameter, moisture content and ash content of the fuel.
L
ENGTH
AND
DIAMETER
The diameter of the pellets used must be in accordance with the op-
eration of the HDG Compact 25 - 80 connected TBZ 90 with pellet
suction system D06. When connected to another delivery system
(e.g. HDG flexi blade delivery system, HDG hinged arm delivery
system or HDG pellet delivery system PSZ), the diameter can also
comply with D08.
•
D06
The diameter of the pellets must be 6 mm +/- 1 mm. The length of
the pellets must measure between 3.15 mm and 40 mm. A maximum
of 1.0% by weight of the pellets may be longer than 45 mm.
•
D08
The diameter of the pellets must be 8 mm +/- 1 mm. The length of
the pellets must measure between 3.15 mm and 40 mm. A maximum
of 1.0% by weight of the pellets may be longer than 45 mm.
W
ATER
CONTENT
The water content must be less than 10% (M10) for property classes
A1, A2 and B.
A
SH
CONTENT
The ash content of the property class A2 and B is higher than that of
A1 due to the higher proportion of bark, needles and leaves. The
maximum ash content for property class A1 is 0.7% by weight (A0.7),
for property class A2 the maximum ash content is 1.2 % by weight
(A1.2) and for property class B the maximum ash content is 2.0 % by
weight (A2.0). In accordance with the 1st Federal Emission Control
Ordinance, operation with pellets in Germany is limited to property
class A1.
Alternatively pellets with the “ENplus” or “DINplus”, certificate are
also suitable as these also meet the quality requirements of property
class A1.
