7
5797 137 - 01
Vitoflex 300-UF Technical Data
General Information
Wood Fuel Requirements
(continued)
Maximum water content
The maximum allowable water content of the fuel for
Vitoflex 300-UF systems is limited to 50%.
The water content impacts the maximum boiler output.
Non-wood fuels
Non-wood fuels even if consisting of biomass, such as
needles, foliage, grain, straw, fruit pits, etc, are unsuited
as fuel for boiler operation and may not be used.
Suitable fuel types for Vitoflex 300-UF systems
- Bulk density
S
in kg/m³ [lb/ft
3
], water content (
W
) in %,
size C1, C7, P1, P2, P4 as per CAN/CSA- B366.1-M91.
Note
: Fuel for Vitoflex 300-UF systems allow for a max.
of 50% water content (
W
).
Limitation super fines and dust [wood particles smaller
than
1
/
32
in. (1.0 mm)]
Max. 10.0% of the total mass; if fuel does not comply
with this limit the following process may occur:
- Temperature peaks
- Slag formation
- Even higher temperature
- This process leads to damage by overheating and can
affect refractory materials.
Elevated values are especially critical for remnant wood in
combination with elevated values of Chlorine and Sulphur.
Saw dust
Fuel code Bulk Density
kg/m³ [lb/ft³]
Water content % Fuel Size
Description
a
S
130 [8.1]
W
10 to
W
20
C1
Sawdust, untreated (planing shop)
b1
S
200 [12.5]
W
20 to
W
35
C1
Sawdust, untreated (sawmill)
c2
S
250 [15.6]
W
35 to
W
50
C1
Sawdust, untreated (sawmill)
Wood chips
Fuel code Bulk Density
kg/m³ [lb/ft³]
Water content % Fuel Size
Description
b2
S
200 [12.5]
W
20
C7
Forest wood chips, soft, untreated
c1
S
250 [15.6]
W
20 to
W
35
C7
Forest wood chips, soft, untreated
d1
S
300 [18.7]
W
20 to
W
35
C7
Forest wood chips, soft/hard, untreated
d2
S
300 [18.7]
W
35 to
W
50
C7
Forest wood chips, soft, untreated
e1
S
350 [21.8]
W
20 to
W
35
C7
Forest wood chips, hard, untreated
e2
S
350 [21.8]
W
35 to
W
50
C7
Forest wood chips, soft/hard, untreated
f1
S
400 [24.9]
W
35 to
W
50
C7
Forest wood chips, hard, untreated
Shavings and chips
Fuel code Bulk Density
kg/m³ [lb/ft³]
Water content % Fuel Size
Description
g
S
130 [8.1]
Less than
W
15
C7
Shavings & chips from wood remnants,
dry, mixed
h
S
200 [12.5]
Less than
W
15
C7
Shavings & chips from wood remnants,
dry, mixed
i
S
250 [15.6]
Less than
W
15
C7
Shavings & chips from wood remnants,
dry, mixed
Pellets and briquettes
Fuel code Bulk Density
kg/m³ [lb/ft³]
Water content % Fuel Size
Description
j
S
350 [21.8]
Less than
W
15
P4
Briquettes from wood remnants
c
in. (20
mm) to max. 2 in. (60 mm)
k1
S
650 [40.6]
Less than
W
10
P1
untreated up to
e
in. (10 mm)
k2
S
650 [40.6]
Less than
W
10
P2
untreated
e
in. to
c
in. (11 mm to 20 mm)
Note
: For size of wood chips, see page 6.
