Viessmann KOB Pyrot KRT Series Technical Data Manual page 8

General Information
Wood Fuel Requirements
Maximum water content
The maximum allowable water content of the fuel for
Pyrot systems is limited to 35%.
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.
Limitation super fines & dust [wood particles smaller than
1
/ in. (1.0 mm)]
32
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]
a S130 [8.1]
b1 S200 [12.5]
c2 S250 [15.6]
Wood chips
Fuel code Bulk Density kg/m³ [lb/ft³]
b2 S200 [12.5]
c1 S250 [15.6]
d1 S300 [18.7]
d2 S300 [18.7]
e1 S350 [21.8]
e2 S350 [21.8]
f1 S400 [24.9]
Shavings and chips
Fuel code Bulk Density kg/m³ [lb/ft³]
g S130 [8.1]
h S200 [12.5]
i S250 [15.6]
Pellets and briquettes
Fuel code Bulk Density kg/m³ [lb/ft³]
j S350 [21.8]
k1 S650 [40.6]
k2 S650 [40.6]
Note: For size of wood chips, see page 7.
8
(continued)
Suitable fuel types for Pyrot systems
- Bulk density (S) in kg/m³ [lb/ft³], water content (W) in %,
size C1, C7, P1, P2, P4 as per CAN/CSA-B366.1-M91.
Note: Fuel for Pyrot systems allow for a max. of 35%
Water content % Fuel Size
W10 to W20 C1
W20 to W35 C1
W35 to W50 C1
Water content % Fuel Size
W20 C7
W20 to W35 C7
W20 to W35 C7
W35 to W50 C7
W20 to W35 C7
W35 to W50 C7
W35 to W50 C7
Water content % Fuel Size
Less than W15 C7
Less than W15 C7
Less than W15 C7
Water content % Fuel Size
Less than W15 P4
Less than W10 P1
Less than W10 P2
water content (W).
Description
Sawdust, untreated (planing shop)
Sawdust, untreated (sawmill)
Sawdust, untreated (sawmill)
Description
Forest wood chips, soft, untreated
Forest wood chips, soft, untreated
Forest wood chips, soft/hard, untreated
Forest wood chips, soft, untreated
Forest wood chips, hard, untreated
Forest wood chips, soft/hard, untreated
Forest wood chips, hard, untreated
Description
Shavings & chips from wood remnants,
dry, mixed
Shavings & chips from wood remnants,
dry, mixed
Shavings & chips from wood remnants,
dry, mixed
Description
Briquettes from wood remnants c in. (20
mm) to max. 2 in. (60 mm)
untreated up to e in. (10 mm)
untreated e in. to c in. (11 mm to 20 mm)
Pyrot Technical Data