Burn-Off Phase; Expansion Noises; The Right Fuel - HASE Lisboa Mode D'emploi

At a temperature of about 225°C (ignition temperature), the actual combustion begins
with the ignition of the resulting gases and the release of heat. There must be an adequate
supply of oxygen available for this purpose. The peak of the combustion process is reached
at approx. 300°C. The reaction process is now so rapid that the largest amount of heat is
released at this point; flames can reach temperatures of up to 1100°C.
14.3 Burn-off Phase
Glowing charcoal embers remain after the volatile components have been burned off.
These burn slowly, almost without flames, at a temperature of approx. 800°C.
Crucial to a clean and efficient combustion process is a complete (as possible) chemical
reaction of the wood gases with the oxygen in the combustion air. With your Hase stove,
the combustion air is pre-heated and guided into the fire box via wide air inlet openings,
Fig. 5 The Combustion Process
enabling a good and thorough mixing of the gases with the air. An important variable in any
combustion phase is the amount of combustion air. Not enough air leads to an oxygen de-
ficiency and incomplete combustion, while too much air reduces the fire box temperature
and thus the efficiency. Incomplete combustion can generate air pollutants such as dust,
carbon monoxide and hydrocarbons.
14.4 Expansion Noises
Steel expands upon heating and contracts as it cools, which can cause your stove to emit
audible expansion sounds. However, the design and construction of your stove takes this
into account and prevents this physical process from damaging the stove.
15. The Right Fuel
Only fuels which generate low quantities of smoke may be burned in stoves. For the Lisboa,
only natural, untreated, beechwood logs, including the adherent bark, can be used as
fuel.
Degasification
Highly resinous coniferous wood (e.g. spruce, pine, fir) tends to emit flying sparks and
leaves behind a fine layer of flue ash that can swirl up when the fire box door is opened.
Drying
he burning of e.g.:
Burn-off
For the most attractive stove fire, use beech wood logs. If other types of wood are
used, such as oak, birch, pine or larch, we recommend adding beech wood for
picturesque dancing flames. Brushwood and small pieces of wood are good
kindling materials.
- damp or moist wood (residual moisture content over 20%),
- varnished or plastic-coated wood,
- wood treated with wood preservatives,
- household waste, or
- paper briquettes (pollutants: cadmium, lead, zinc)
- any flammable fluids (including methanol and ethanol) as well as any fuel pastes
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