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7.3. BURNING
SAS MI type boiler exploitation is performed based on cycling batching system, what
means, that once the whole bath of fuel placed in a combustion chamber is burned
out and an ash is removed, new charging with fuel takes place and then firing of new
portion of fuel is performed using kindling fuel for supporting this process.
One batch of basic fuel is sufficient for 24 hours, however this time may be extended
depending on heating boiler load. Fuel (fine coal KL 27/10) filling-in and following
firing up activity is carried out trough boiler’s upper door.
In the central heating requirement is changing along with outdoor conditions, e.g.
daytime and temperature. Temperature of water leaving out the boiler depend also
on thermal characteristic of building, e.g. construction materials, in particular the
insulation one. Combustion intensity and heating capacity of the boiler is regulated by
adjusting the temperature will be then displayed on LCD. The controller ensures
optimal combustion process, by regulating fan and circulation pump work. Fan’s
rotational speed depends on measured temperature and parameters setting. Once
fire up process is finished, and boiler riches required temperature, the controller
keeps it constant. If boiler’s temperature is lower than set, rotation speed of fan is
increased, if is higher, scavenges of the boiler are only performed.
7.4.CLEANING THE BOILER
In order to use fuel in the safe manner, and to get declared boiler’s power and heat
efficiency, keeping adequate cleanliness of combustion chamber and convection
channels is indispensable.
As far as furnace chamber of the boiler is considered, special attention should be
paid when removing ash and slag from between grate orifices and chamber’s walls.
Such a cleaning should be exercised prior each boiler’s fire up process, but not
less than after 150÷260 of boiler’s continuous work. Cleaning of convection
channels, with volatile ashes residues, should be performed every 3÷7 days,
depending on quality of burned fuel. The cleaning operation is done through
washout holes indicated on the drawing (p. 12). Once cleaning is finished,
those wholes should be sealed tightly. Cleaning the chimney duct is not less
important.
Air distribution system holes, placed in the interior of combustion chamber are to be
cleaned on routine basis (pos.13). This is highly important to ensure permeability of
the air distribution system supplying the combustion chamber with the air Otherwise,
combustion process may be adversely affected.
7.5. END THE HEATINHG SEASON
Once heating season is finished, or in other cases of scheduled stops, wait
the fuel to be completely burned out. Once boiler is out and cooled down, remove
from the furnace all remains of burned fuel and apply cleaning and conservation of
the entire boiler. Pay special attention to lubricate inner partitions and movable
elements with oil.
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