Bedienungsanleitung La Nordica LNK40 (Seite 39 von 128) (Deutsch, Englisch, Französisch, Italienisch)

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TECHNICAL DESCRIPTION

ADVANTAGES OF DOWNFIRED BOILERS

Combustion in boilers is carried out at high temperatures on the principle of gasication that saves fuel and protects the environment.

The primary and secondary air is heated in the boilers at high temperatures and this ensures a hot and stable ame and constant fuel

quality. All models are equipped with a suction fan and are easily handled and manageable. A large fuel feeder provides the option to

burn logs of wood 500 mm long. All models are equipped with a D.S.A. cooling coil.

DOWNFIRED BOILER OPERATION

Burning wood with a traditional system dened as << direct ame >>, whether this is carried out on a replace, a cooker or a stove, all the

wood that is loaded will burn together since it is covered by the ame that envelopes it and rises from the bottom.

For this reason, it will not be possible to obtain longer fuel duration.

With a down-red boiler, also known as << total gasication boiler >>, fuel is obtained with a completely dierent system, which almost

avoids the entire problem described above.

This boiler is divided into two parts: the upper part (loading chamber) is used to load the wood and its volume is such that it can contain an

amount to ensure operation (maximum continuous power) between 3 and 4 hours.

Combustion air, which is divided into primary and secondary, is fed through a fan connected immediately above the smoke discharge pipe

(SUCTION BOILER), which depressurises the bottom chamber by suctioning the smoke through the slot that opens at the bottom of the said

chamber.

The bottom part contains the actual combustion chamber with the ash collection drawer.

Operation is as follows: load a moderate amount of the wood from the centre door. Wood that is in direct contact with the embers will heat

up immediately and develop fuel gas.

The primary air sucked up by the fan through the opening will lter through the pieces of loaded wood until it reaches the contact point

between the wood and the embers igniting this gas, thus causing partial combustion. This obtains a ame that is partly composed of carbon

monoxide, which, as known, is fuel gas.

When it passes through the nozzle opening that communicates the loading chamber with the bottom chamber, secondary air reaches the

ame (still input by the fan), which completes combustion.

During this phase, the temperature of the ame can increase signicantly and go beyond 1100 °C, thus completely burning all substances, which

would otherwise remain partially burned in a traditional system. Moreover, excess air required will be much more contained (approximately

20 - 30%) compared to more than 100% required in other systems, thus limiting sensible heat dispersion in the smoke.

On the other hand, the upper chamber will hardly have a ame since this is sucked up by the fan and made to pass through the central

opening. The loaded pile of wood is not covered with the ame and it does not catch re like a traditional system.

The wood will only burn when it is in contact with the remaining embers left from previous combustion.

ATTENTION

When the fan is o, the wood left in the boiler still remains in contact with the layer of embers and thus continues gasifying; however, the

gas produced is not burned. Since there is no combustion air, the most volatile part of the gas exits from the ue, whereas the less volatile

part deposits in the loading chamber and the surfaces touched by the ame, thus creating tar scaling that can, in certain cases, obstruct

the smoke passages.

The wood still burns and causes a signicant reduction in the boiler’s overall performance. Also, a large part of the moisture in the smoke

remains condensing inside the boiler, thus generating the onset of corrosion.

For these reasons, the system must be sized correctly to avoid long pause times that would cause signicant problems like the ones mentioned

above.

FOR THESE REASONS, THE BOILER MUST NEVER BE OVERSIZED COMPARED TO ACTUAL SYSTEM REQUIREMENTS

STANDARD COMPONENTS

The boiler is supplied complete with:

• digital display

• power supply cable (plug NOT supplied)

• cleaning set

• assembly and operating instructions

• identication plate

• suction fan complete with smoke ttings

• Puer probe (storage tank technician)

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