6
2.2.
Quality requirements for pellets fuel
In table below given requirements as to quality of pellet fuel are shown. Using fuel which complies
to DIN 51731 or DIN PLUS certification or meet the rules of EN-14961-2 norm, extends longevity
of burner. The pellet storage location should be dry and well-ventilated. It is important that prior to
the hopper filling the pellet temperature is equal to the boiler room temperature.
Table 1. Quality requirements for pellet fuel.
Wooden pellet
Units
CERTIFICATE
Quality criteria
DIN plus
DIN 51731
Diameter
mm
4≤d<10(6)
4≤d<10(6)
Length
mm
5 x D(3)
<50
Density
kg/dm³
1,12
1,0<
Density
<1,4>
Ash
%
<0,5(1);(7)
<1,50
Humidity
%
<10
<12
Humidity when delivered
%
Not specified
Not specified
Caloric value
MJ/kg
>18(1)
17,5<HW<19,5(2)
Sulphur
%
<0,04(1)
<0,08
Nitrogen
%
<0,3(1)
<0,3
Chlorine
%
<0,02(1)
<0,03
Dust collected
%
<2,3
-
Additives facilitating
pressing
%
<2(8)
(4)
Ash melting temperature
-
Not specified
Not specified
Arsenic
mg/kg
<0,08
<0,08
Lead
mg/kg
<10
<10
Cadmium
mg/kg
<0,5
<0,5
Chrome
mg/kg
<8
<8
Copper
mg/kg
<5
<5
Quicksilver
mg/kg
<0,05
<0,05
Zink
mg/kg
<100
<100
Halogens
mg/kg
<3
<3
(1)
Dry weight
(2)
Free from water and ash
(3)
No more than 20% of pellets can be as long as 7,5 x diameter
(4)
DIN forbids to use additives. This ban is not valid to small heating systems.
(5)
In warehouse of the producer
(6)
Tolerance in differences in diameter
± 10 %
(7)
Allowed content of dust up to 0,8%, if it is naturally higher, specific for given sort of wood
(8)
Only natural additives from biomass are allowed
2.3.
Burner nameplate template
ATTENTION!
Change of pellets diameter during using of
burner (e.g. from 6mm to 8mm) requires
regulating the controller by a qualified
installer.
Содержание M-line M350
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