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Figure 6.7.2 View of the fuel hopper chamber and fuel state approximately 30 minutes after loading.
The figure above shows that the wood logs have already dried out and partial carbonation is
apparent - wood logs appear darkened and a great deal of volatile gas (smoke) is being released. If a
combustion process is visible, this is due to penetration of fresh air in the chamber from the open door (in
nominal opening conditions there is no flame but only release of plenty of volatile gases in the chamber).
NOTE:
Be careful not to block the door in order to close it easily when arranging wood logs.
If different material is loaded into the fuel hopper chamber, the particles with a higher humidity
content and/or larger particles must be arranged in the centre of the chamber, while partially
dried or smaller particles must be arranged by the side of the chamber. This allows to avoid
accumulation of fuel directly over the burner nozzle and consequently obstructing the nozzle
itself, which would greatly decrease the heat output of the boiler.
EXPLANATIONS:
The combustion gas fan is turned off when the circulating water set point is reached and the boiler
switches to stand-by mode. In this mode, the fuel consumption rate decreases, as does the heat
output of the boiler. Practical experience indicates that the typical heat output of a boiler in stand-by
mode is approximately 10% of the nominal heat output of the boiler. In this mode, a small amount
of air enters into the boiler and starts combustion residue oxidation to keep the boiler in so-called
"ready for operation" mode.
Start-up procedures
TECNIKA 28-35
USE AND INSTALLATION MANUAL
Technical dept. - All rights reserved - Reproduction prohibited
Chapter
6
page 39
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