Fuel; Suitable Fuels; Fuel Discharge By Means Of Screw Conveyor; Discharge Conveyor, Pellet, D = 120 Mm - Viessmann KOB PYROTEC Technical Manual

Design information
(cont.)

6.10 Fuel

The PYROTEC grate combustion has been specially developed for the
automatic combustion of dry and moist wood fuels (waste wood, wood
pellets or woodchips from forest thinnings up to max. W50). It com-
bines the benefits of underfeed combustion with the advantages of
grate combustion to optimum effect.

Suitable fuels

The Pyrotec is suitable for the following dry to moist wood fuels in
accordance with ÖNORM M 7133:
Note
The following are unsuitable types of fuel: Fossil fuels and those con-
taining sulphur, such as anthracite and coke, as well as plastics, grain,
straw, material soaked in flammable liquids and waste wood treated
with plastics or wood preservatives.
Bulk density S (kg/m³)
S 130
S 200
S 200
S 250
S 250
S 300
S 300
S 350
S 350
S 400
S 130
S 200
S 250
S 350
S 650
S 650

6.11 Fuel discharge by means of screw conveyor

Discharge conveyor, pellet, D = 120 mm

Part no. 7837 954
As pellet transportation from a rectangular room with the possibility of
filling from the top. The pellets trickle via a tilted intermediate floor into
the conveyor channel. The supply screw conveyor found inside this
channel transports the pellets to the outlet.
Standard delivery:
■ Discharge conveyor for pellets according to project drawing
To be carried out on the customer side:
Delivery and installation of the intermediate floor (preferably made of
wood) incl. static calculation and sizing. The forces resulting from the
weight of the combustion material (approx. 650 kg/m3) should be
transferred to the silo floor and not through the discharge conveyor.
Observe this when constructing the intermediate floor.
Specification
Pellet discharge conveyor
Part no.
a
b
c
PYROTEC
Water content W (%) Size G (mm)
W10 to W20 G30/50
W20 to W35 G30/50
W20 G30/50
W20 to W35 G30/50
W35 to W50 G30/50
W20 to W35 G30/50
W35 to W50 G30/50
W20 to W35 G30/50
W35 to W50 G30/50
W35 to W50 G30/50
< W15 G30/50
< W15 G30/50
< W15 G30/50
< W15 G30/50
< W10
< W10
mm
mm
mm
Soft natural woodchips from forest thinnings
Soft natural woodchips from forest thinnings
Soft/hard natural woodchips from forest thinnings
Soft natural woodchips from forest thinnings
Hard natural woodchips from forest thinnings
Soft/hard natural woodchips from forest thinnings
Hard natural woodchips from forest thinnings
Dry, mixed shavings, chippings from waste wood
Dry, mixed shavings, chippings from waste wood
Dry, mixed shavings, chippings from waste wood
Briquettes from waste wood D 40 to 60 mm
Standardised natural pellets D 6 to 10 mm
Standardised natural pellets D 11 to 15 mm
Note
Price given per m; total length in m = length of conveyor channel
Note
For increases of 0° to 8°; exclusively for pellets; boiler output up to
max. 1250 kW
Fuel
Natural sawdust
Natural sawdust
Natural sawdust
6
D=120 mm
7837 954
< 9250
> 750
< 10000
43