TECHNICAL FEATURES AND DIMENSIONS
8
2.4.
Fuel
The BIOPLEX series is designed for automatic function with solid fuel of biogenic or fossil
nature, with granulation up to 30 mm and humidity up to 20%. The boiler is also able to be
used on wood or other solid fuels with manual feeding, without any modification.
This means different types of biomass fuels, such as pellet, agropellet, olive husks, fruit
kernels, cereals, granulated carbon. When the fuel used has characteristics that significantly
vary from nominal (i.e. carbon, cereals, agricultural residues), it is recommended that they are
used in combination with pellet or agropellet at a 50:50 ratio. If you want to use solely carbon
as fuel, please contact the manufacturer.
The fuel with the best quality, concidering calorific power, ash content, humidity and
standartization, is wood pellet. The less quality of the fuel, the more fuel supply must be
provided to achieve the nominal power and of course the most the consumption and the ash
remains.
The nominal characteristics of the boiler are calculated for use on wood pellet!
Fuel type
Calorific
power
Max
diameter
Max
humidity
Ash
content
kWh/kg
mm
%
%
Pellet
4,8
6 – 8
<10
<1
Agropellet
4 – 4,2
6 – 10
<10
<5
Coal
5,3 – 6,5
3 – 25
<15
4 – 8
Lignite
1,6 – 3,8
3 – 25
<20
<10
Cereals (oat)
4,2
3 – 6
10 – 13
0,6
Wood chips
4,3
5 – 25
<20
4 - 6
Barks
2,6
5 – 25
<20
8 - 10
Wood
4 – 4,3
-
<20
4 - 8
Wood briquette
5,2
-
<10
<4
Table 1.
Characteristics of different types of fuels
Every type of biomass fuel contains a significant amount of humidity, which highly affects its
combustion behaviour and calorific value. Boiler output, efficiency and autonomy will
significantly diminish as the humidity increases. The nominal data presented in this manual are
calculated for humidity content 10%. Maximum allowable humidity content is 20%. If the fuel
has bigger humidity, the combustion will be highly imperfect, causing problems to the furnace
and the feeder.
For proper and efficient function and a long lifespan, it is strictly recommended that only dry
wood is used, with a humidity content of 20%. Practically, this means at least one year dry
wood.
In order for the feeding and combustion system to function properly the
maximum allowed humidity of the fuel is 20%!
It is prohibited the use of explosive, inflammable materials, plastic, domestic
residues, etc.
The boiler is provided with a flange for mounting a burner for use with oil or gas as an
alternative fuel. However, this option is an emergency alternative, and it is not recommended
that boiler is on stable function on oil or gas. The efficiency will be very low on such fuels.
If a burner is mounted, remove it before you use solid fuel again.
It is prohibited to manually feed solid fuel in the boiler simultaneously with the
burner function!
