Technical features and dimensions
9
fig. 3
AIREX BOILER STRUCTURE
The hydraulic system inside the boiler is designed in such a
way that a thermostatic system always keeps the temperature
of the water surrounding the wood storage high so as to eliminate
the dangerous phenomenon of condensation. The boiler body
is composed of two elements placed inside the other, so that
between the two a cavity of water (fig.3) is formed.
The large capacity wood storage has a special thermal and
mechanical high resistance refractory press.
The lower catalyst in refractory material perfects combustion
by burning unburnt materials and thus reducing the values of
pollutant particles.
The following parts can be distinguished (fig.3):
1. Wood storage and drying zone
2. Gasification zone
3. Embers zone
4. Burner in refractory material
5. Combustion chamber
6. Heat exchange surface
7. Catalyst in refractory material
8. Boiler water
9. Thermostatic system
10. Bypass
11. Safety heat exchanger
12. Primary air inlet channels
M System hot water flow
R System return
GASIFICATION ZONE (2)
Gasification takes place in the lower part of the firewood storage.
It is very important that gasification is as regular as possible, so
as not to overload the burner with gas.
Gasification speed depends on the amount of wood and the
dimensions of the drying zone. Generally, it is better to use lar-
ge logs if they are dry and small logs if the wood is moist. The
quantity of primary air, proportional to the delivered output, is
regulated via the adjustment system.
EXCHANGE SURFACE (6)
The wood contains low levels of sulphur allowing the boiler to
run with flue gas at relatively low temperatures. To improve boiler
efficiency, we have therefore designed an exchange surface with
smoke pipes (fig. 4).
A manually “scraping” system allows to keep the inner exchange
surfaces of the pipes clean; this operation, which lasts a few
seconds,
is recommended whenever wood is loaded
.
The solid combustion residues (ashes), which lie on the high
temperature refractory catalyst (fig. 3, pos. 7), will become, with
time, always lighter until they will be carried by the gas speed
and deposited in the lowest area of the smoke chamber, from
which they will be removed during cleaning.
fig. 4
M
R
9
10
11
4
1
6
2
12
3
5
7
8
F
F
F
