Gasification Process - Orlanski ORLIGNO 200 Instruction Manual & Service Manual

4. Gasification process

Gasification boilers must operate in specified conditions.
Optimal boiler's temperature is 85 - 90 °C. At lower temperatures gasification process is not
running correctly – boiler cannot reach nominal power and fuel usage is relatively higher. Wood
drying in loading chamber is crucial stage in gasification process – at lower temperatures boiler
cannot reach right temperature and gasification process is disturbed. Main source of heat in
Orlan boilers is gas flame created during gasification process, if main conditions won't be met for
proper gasification process, amount and quality of flame will be inadequate.
Essential factor influencing right gasification process is quality, moisture content and type of
burned wood. The best is hardwood (beech, oak, harnbeam) with moisture content 15-20%.
Usage other types of wood like spruce is acceptable, however heat exchanger pollution will
increase and time between boiler stoking will decrease. In order to determine proper moisture
content it is recommended to use moisture meter (pic. 3)
Appropriate wood assures correct boiler operation. Usage of wood with different parameters
other than recommended will affect proper work of boiler.
Outside drying
- in months
Pic.2 Wood humidity chart.
Wood humidity [%]
Tree's chopping off
Pic.3 Moisture meter
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