17
2.6 - PELLET CHARACTERISTICS
The main feature of the ALLBIOMIX boiler is that of burning
natural fuel (pellets) obtained in an environmentally-friendly way
from wood industry waste (sawdust, powders). The sawdust
and powders coming from wood processing, after having been
appropriately cleaned and dried, are compacted at high pressure
to create pure wood cylinders: pellets.
The main features of the pellet are its low moisture content
(lower than 10%), its high density (> 600 kg/m
3
) as well as its
regularity and compactness providing this type of fuel a high
Net Calorific Value.
In order to provide ALLBIOMIX with a long lifespan, Unical
recommends the use of certified pellets.
The pellets used to feed the boiler must have high quality features
such as, for example, those determined by the standard EN
14961-2. The following are some of their fundamental data.
The pellets, as foreseen by current Italian
legislation governing commodity features of
fuels (DPCM 2.10.1995), must be produced
exclusively with untreated wood sawdust
without other materials added.
Storage and handling of pellets are important operations to be
performed with care:
- The fuel must be stored in a dry place which is not cold;
- Pellets must be moved in such a way to avoid excessive
crushing into fine powders.
Compliance with these two simple rules provides better
combustion efficiency and conserves the moving mechanical
parts of the appliance.
If ALLBIOMIX remains unlit for long periods
(more than seven days), the tank must be
emptied from residual fuel to keep it from
becoming excessively moist which could
cause the appliance to malfunction.
A high moisture content in the pellet can cause
it to break up into powder generating a greater
accumulation of residue in the brazier and a
blocking of the fuel feed system (screw).
Tec
hnical f
eatures
Parameter
Diameter (D)
Length (L)
Water content (M)
Ashes (A) 3
4
Mechanical durability (DU)
Fine particles (< 3.15 mm)
Additives
Lower Calorific Value (Q)
Bulk density (BD)
Nitrogen (N)
Sulphur (S)
Chlorine (Cl)
Arsenic (As)
Cadmium (Cd)
Chromium (Cr)
Copper (Cu)
Lead (Pb)
Mercury (Hg)
Nickel (Ni)
Zinc (Zn)
Melting point of the ashes (DT)
4
M.U.
mm
mm
%dm
2
%dm
2
%us
%us
%dm
MJ/kg us
kg/m
3
%dm
%dm
%dm
%dm
%dm
%dm
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
°C
EN plus-A1
EN plus-A2
6 (
±
1)
31.5
≤
L
≤
40
1
≤
10
≤
10
≤
0.7
≤
1.5
≥
97.5
≥
97.5
< 1
< 1
≤
2
≤
2
16.5
≤
Q
≤
19 16.3
≤
Q
≤
19
≥
600
≥
600
≤
0.3
≤
0.5
≤
0.03
≤
0.03
≤
0.02
≤
0.02
< 1
< 1
≤
0.5
≤
0.5
≤
10
≤
10
≤
10
≤
10
≤
10
≤
10
≤
10
≤
10
≤
10
≤
10
≤
100
≤
100
≥
1200
≥
1100
1) Maximum 1% of pellets with length greater than 40 mm. Maximum length 45 mm.
2) us = unaltered state, dm = dry matter
3) Determination at 550°C
4) In this case, the ashes must be produced at 815°C
Summary of Contents for ALLBIOMIX
Page 1: ...ALLBIOMIX INSTRUCTIONS ON INSTALLATION USE AND MAINTENANCE ...
Page 4: ...4 This page has been intentionally left blank ...
Page 10: ...10 2 2 HYDRAULIC DIMENSIONS AND CONNECTIONS ...
Page 11: ...11 Technical features 2 3 INSTALLATION OF THE BOILER AND PELLET TANK ALLBIOMIX 34 ...
Page 12: ...12 ALLBIOMIX 45 ...
Page 13: ...13 Technical features ALLBIOMIX 80 ...
Page 24: ...24 4 5 6 7 ...
Page 47: ...47 ...