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Figure 5.8. View of the axes of the primary air control flap;
The position of the flap could be easily changed by unscrewing the fixing screw,
manually push or pull the axes of the flap (i.e. change its position). It is highly
recommended to change the position of the flap in small steps – about 1 or 2
mm, and finally fix the primary air control flap with the screw.
EXPLANATION: small axial movement of the axes of the primary air control
flap makes sensible effect on the operating conditions of the combustion process
and the overall performance of the boiler. That’s why any change of the
adjustment of the boiler’s air distribution should be followed with appropriate
period of time in order get effect. The practice shows, that utilization of wood
logs, which cover the requirements, described above, the primary air control
flap should be closed (pushed back inside). However, in case the fuel’s moisture
content is higher than required, then the primary air control flap should be
opened to some extend, in order to sustain the pyrolisis process of the fuel in the
hopper chamber. Again, change the position of the primary air control flap into
small steps, in order to achieve efficient raw fuel devolatilization.
Axes of the primary air
control flap
Fixing screw for the axes of
the primary air control flap
Air distribution box
