DK9802C2 PV50c user manual ENG
Vers: C2 page12/38
18 Fuel level sensor
Optical sensor to detect the presence of pellets in internal auger inlet.
Normally, external auger is switched on, if no pellets detected.
19 Burning chamber cover Replaceable cover to retaining combustion quality.
4.4
Pellets
Wood pellets are an environmentally-friendly biofuel type. The advantages of the pellets are the
significantly lower prices compared to other fuel varieties, simplicity and convenience. Wood pellets are a
product made by compressing renewable biomass - generally residuals from the wood and/or agricultural
products industry. Pelletized biomass is a high density, low moisture product with a high heating value
that burns cleanly, consistently and efficiently.
Only wood pellets according to EN 14961-2 (ENplus-A1, ENplus-A2, EN-B) can be used in PV50c burners.
Table 3 Wood pellets key data
Raw material
Sawdust, cutter shavings, stem wood, logging residues, bark,
chemically untreated wood
Calorific value
4700-5100 kWh/ton
Bulk density
ca 650-670 kg/m
3
Volume of 1 ton
1.5-1.6 m
3
Diameter
6 or 8 mm
Length
3,15-40 mm
Fines content (<3,2 mm)
< 1%
Moisture content
< 10 %
Ash content
< 3%
Ash fusion
> 1100
o
C
To replace 1000 l light oil
ca 2 tons or 3 m
3
NOTICE: Nominal power of the burners is given for the use of pellets produced in accordance with DIN or
DIN Plus Specifications. For pellets with other combustion parameters, in particular with a different
calorific value, ash level and moisture – the power of the burner may be different, usually smaller.
Burner, external auger and container form a common system. Size and location of the container depends
on needs and possibilities of boiler room or boiler house. When choosing container note that:
1.
The volume of pellets container in same room with boiler doesn’t exceed 500 liters (ca 350 kg)
2.
Container is made from fireproof material
3.
Container is placed in the way that rising angle of external auger doesn’t exceed 45
0.
See Figure 12.
4.
Container should be closable with cover.
5.
4.5
Pellet quality
Not all wood pellets make good fuel. It is always a good idea to review the pellet’s analysis and try some
before committing to several tons. Higher pellet quality allows for more efficient operation. Many
variables contribute to the quality of a wood pellet. Many of these have been identified and are regularly
tested for by most pellet manufactures and distributors.
