9
Fuel Quantity and Pellets Travel Time to Burner
The time pellets take from store to burner, depends on the pellets storage location in relationship to the burners
location. There are several models of screw-feed to chose from, each model can be configured and rigged
differently to convey pellets to the burner.
To avoid uneven pellets delivery to the burner and varying priming-measure quantities feeding the burner, the
screw-feed should not be at more than a 45
o
angel to the horizontal floor plane.
Provide an intermediate storage to ensure continuous and even delivery. Delivery times of pellets from storage to
the burner will be afected by the size and condition of the pellets and the angle of the feed-screw to the horizontal
plane.
Test the delivery time of the pellets through the feed-screw to the boiler. Allow the feed-screw to operate at full
speed for 3 minutes. Collect the pellets discharged from the feed-screw, weigh the pellets. By checking this weight
against the table below, it is possible to establish the kW effect output and boiler efficiency obtained from the
amount of pellets delivered.
Boiler Efficiency Table (1kg pellets = 4.8kWh)
Actual Energy Supply
Pellets in gram weight
per 3 minutes / kg per
hour
Approx. volume Pellets in
decilitres per 3 min.
Indicated effect at 80%
boiler efficiency
500 kW
5 210 / 104,15
80
400 kW
700 kW
7 294 / 145,81
112
560 kW
Adjustment of Air Supply To Burner (operating without activated lambda sond).
On initial installation of burner and subsequent adjustment of flame, check the colour of the flame. For maximum
efficiency, the flame should be light orange in colour. A white flame indicates too much air supply. A dark, red flame
indicates too little air supply. Adjust the speed of the bith fans using the burner’s digital control system. After
changing any settings allow the burner to operate for 2-3 minutes before carrying out a further test. This allows the
change of setting to be activated and run-in.
If changing the quality of pellets, adjusting the settings of the burner may be required to maintain efficient burning.
The above is an initial and approximated setting. For finer adjustment, a flue-gas measuring device will be required.
NOTE: When burning pellets, settings and the appearance of the flame will continuously show very minor
variations – this is normal and not an indication of a fault.
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Страница 13: ...13 Drowing Dimensions...
