HDG Compact 100, Руководство пользователя

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3 Mode of operation – Fuel quality requirements
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HDG Compact 99 - 200 - Version 1 - en
©
HDG Bavaria GmbH 07/2008
This results in lower efficiency and thereby leads to greater wood
consumption. Increasing moisture in the fuel material also causes re-
duced efficiency, greater amounts of ash and smoke, as well as ma-
king it increasingly unfit for storage.
The maximum permissible water content of the wood chips for the
HDG Compact 99 - 200 is 30 % (M30).
For technical considerations, a representative thermal value is se-
lected depending on water content. For burning that is both econo-
mical and low on emissions, the thermal value should not be less
than 3 kWh/kg.
A
SH CONTENT
The ash content for wood in category 2 is higher than that of cate-
gory A1 due to the higher proportion of bark, needles and leaves.
The maximum permissible ash content of wood chips for the HDG
Compact 99 - 200 is 1.5 % by weight (A1.5).
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 dia-
meter 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 cor-
responds approximately to the energy contained in a litre of heating
oil.
In accordance with DIN EN 14961-2, the fuel specifications for wood
pellets are separated into categories A1 and A2. The diameter of the
employed pellets must be in accordance with D06.
• A1/D06
The diameter of the pellets must be 6 mm +/- 1 mm. The length of
the pellets must measure between 31.5 mm and 40 mm. A maximum
of 1% by weight of the pellets may be longer than 45 mm. The water
content must be less than 10% (M10), the ash content must be less
than 0.7% by weight (A0.7).
Water content Moisture Thermal value
Relative wood
consumption
Combustion tem-
perature
10.0 % 11.1 % 3.9 kWh/kg 113 % 1150 °C
20.0 % 25.0 % 3.4 kWh/kg 130 % 1100 °C
26.0 % 35.0 % 3.1 kWh/kg 151 % 1070 °C
30.0 % 42.9 % 2.9 kWh/kg 171 % 1040 °C
Table 3/3 - Thermal value depending on water content
With regard to the quality standards for wood pellets, DIN EN
14961-2 "Solid biofuels - fuel specifications and classes - wood pel-
lets for non-industrial use" applies.