12
NOVAIREX BOILER STRUCTURE
The boiler body is composed of two oval elements placed one
inside the other, so that a water cavity is created between the two.
The large capacity wood storage has a special thermal and
mechanical high resistance refractory press, for the purpose of
keeping the by-pass area dry in all operating conditions.
The following parts can be distinguished:
1. Wood storage, drying zone
2. Gasification zone
3. Embers zone
4. Burner in refractory material
5. Combustion chamber
6. Heat exchange surface
7. Cradle in refractory material
8. Boiler water
9. Safety heat exchanger
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 for gasification to be as regular as possible,
so as not to overload the burner with gas.
Gasification speed depends on the amount of fuel and the size
of the drying area. Generally, it is better to use large logs if they
are dry and small logs if the wood is moist. The quantity of pri-
mary air, proportional to the delivered output, is regulated via
the adjustment system.
EXCHANGE SURFACE (6)
Operating on wood and without very high sulphur percentages,
it is important to achieve very low flue temperatures to improve
water efficiency. Accordingly, a dry-passage exchange surface
was adopted, which is already well-tested for diesel-fired boilers
operating with low temperature water, providing low flue gas
temperatures without the risk of condensation.
The surfaces of the dry ducts "A" feature cuts, to avoid dilation
issues.
The solid combustion residues (ashes), laid on the high tem-
perature refractory cradle will become, over time, increasingly
lighter until they are carried by the gas speed and deposited in
the lowest area of the rear smoke chamber, from which they will
be removed during cleaning.
Summary of Contents for NOVAIREX 35
Page 1: ...INSTALLATION AND MAINTENANCE INSTRUCTIONS NOVAIREX 35 45 55 ...
Page 55: ......
