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•
In case that the thermal capacity of the boiler need to be decreased,
this could be achieved by increasing the periods between fuel
charging and or decreasing the amount of the fuel charged at any
process of boiler’s wood logs charging. In principal the decreased
thermal capacity of the boiler is accompanied with decreased
thermal efficiency, but practice shows that this decrease is
relatively low (some percents) and does not influence the overall
efficiency of the system, but should be considered when calculations
of the thermal capacity of the boilers are done;
•
In case the heat exchanging surfaces of the boiler have been
deposited with ash as well as tar particles, the intensity of heat
exchange rate will be decreased, which will lead to decreased
efficiency of the boiler and the net heat energy, transferred to the
heating system;
5.3.8.1.
Decreasing the thermal capacity of the boiler
In practice the thermal capacity of the boiler is achieved by decreasing the
amount of the fuel, charged in the fuel hopper of the boiler. The decrease
of the thermal capacity could be achieved by increasing the period
between two fuel charging with wood logs. In case the boiler should run
at lower that nominal thermal capacity, then it is highly recommended to
install a heat accumulator tank in the heating system (see the description
above) in order to sustain the optimal performance of the boiler as well as
high efficiency of the system;
5.3.8.2.
Increasing the thermal capacity of the boiler
In practice the increase of the thermal capacity of the boiler could be
achieved by increasing the fuel rate, charged in the hopper of the boiler. In
case that the boiler should run for a long period in this operating mode,
then it is highly recommended to make appropriate air flow adjustments –
see the description above. As the heat consumption is increased, it will
lead to more frequent fuel charging of the hopper of the boiler.
ATTENTION : it is strictly forbidden to increase the thermal capacity of
the boiler above the nominal one;
EXPLANATION: the practice shows, that the decrease or increase of
the thermal capacity of the boiler is relatively difficult to control process,
especially when high efficiency is required. It is highly recommended to
run the boiler at nominal thermal capacity (i.e. nominal operating mode)
and the variations of the of the heat energy consumption will be covered
by a heat accumulator tank. The practice shows that a heating system,
