1.4. WOOD GASIFICATION COMBUSTION PROCESS (wood side)
Combustion process is carried out in double combustion chamber in several phases. After filling the
upper chamber with logs, glow dry the logs, and at temperature 100÷300°C logs are beeing gasified.
The gases created in such process are mixed with the oxygen from air and burn out completely with
high temperature.
Fuel:
wood logs with moisture content up to 20% (max. 25%), minimum size must be bigger than a
nozzle in refractory stone (chamotte) of the upper chamber. This demand for moisture content is
fulfilled with wood dried on air at least 12 months.
Wood pellets are used as fuel in right side of BioTec Plus boiler. Wooden pellets are bio-fuel made of
wooden wastes. Pellets can be packed in different packaging: in bags (15 kg or 1000 kg), or as bulk in
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large (underground) tanks ( 4 - 15 m ) or in basement spaces. Recommended properties of pellets for
firing in BioTec Plus boilers are the following:
- heating value >=
5 kWh/kg
(18 MJ/kg)
- diameter <=
6 mm
- max. moisture content <=
12 %
- max. dust content <=
1,5 %.
1.5. FIRING PROCESS IN WOOD PELLET SIDE
Wood gasification combustion process (wood side), firing process (pellet side)
Technical instructions
BioTec Plus
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