Radijator Inženjering d.o.o, 36000 Kraljevo, Živojina Lazića - Solunca br.6, Srbija
tel. +381 36 399 140, fax. +381 36 399 150, http://www.radijator.rs
e-mail: [email protected]
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The combustion takes place in a two-part firebox in several stages. The upper and lower chamber are
mutually separated by a “draft slot” made of fire-resistant ceramics.
The upper chamber is used to stack wood. Wood logs are properly stacked in the chamber, where the
minimal length of the logs has to be bigger than the “
draft slot”
, but not more than 50 cm. For the
optimal results and maximal degree of utilization, the recommended moisture level in the wood is
around 15%-20%. The pyrolysis process, i.e. “gasification” of the wood takes place in the upper
chamber.
The main pyrolysis process takes place in the lower chamber, which is additionally protected by a
layer of fire-resistant ceramics.
Principle of work of the boiler (Figure 1b):
After the fire is fired up in the boiler (firebox flap is
closed, while it was initially open, as was the primary flap), in the beginning the wood goes through an
additional drying process. When the flame forms, the secondary air flap opens. The wood gasification
process starts in the upper chamber, thus releasing hydrocarbon gases which, due to the draft in the
boiler, want to penetrate the lower chamber through the draft slot. A part of these gases combust in the
upper chamber, while the remaining gases, together with the less combustible particles, combust in the
lower chamber where the temperature reaches around 1100°C.
Figure 1b. Upper and lower combustion chamber and the draft slot
In this way, an insignificant portion of the harmful non-combusted particles reaches the uptake, thus
reducing the level of harmful emissions which complies with all the standards and norms prescribed by
the European Union.
Such combustion achieves the highest possible level of utilization and the boiler has higher efficiency.
