RED ORCHIDEA Instructions d'exploitation télécharger pdf (Page 11)

red

PELLET STOVES Chapter 2

INSTALLATION AND USE MANUAL

page 11

Theoretical notions for installation Technical service - Rights reserved - Reproduction prohibited

2. Theoretical notions for installation

2.1. Pellets

Wood pellets are manufactured by hot-extruding compressed sawdust which

is produced during the working of natural dried wood. The compactness of

the material comes from the lignin which is contained in the wood itself, and

allows the production of pellets without the use of glues or binders.

The market offers different types of pellet with characteristics which

vary depending on what mixture of woods is used. The diameter varies

between 6 mm and 8 mm, with a standard length in the range 5 mm to

30 mm. Good quality pellets have a density which varies between 600

kg/m3 and 750 kg/m3, with a moisture content which varies from 5%

to 8% by weight.

Besides being an ecological fuel (exploiting timber residues to the

maximum and achieving cleaner combustion than is possible with fossil

fuels), pellets also have technical advantages. While good-quality

timber has a calorific power of 4.4 kW/kg (with 15% moisture,

therefore after about 18 months' seasoning), the equivalent figure for

pellets is 4.9 kW/kg.

To ensure good combustion, the pellets must be stored in an area that

is free of humidity and protected from dirt. The pellets are usually

supplied in 15 kg. sacks, so storing them is very convenient.

Good quality pellets ensure good combustion, thus lowering the

emission of harmful agents into the atmosphere.

The poorer the quality of the fuel, the more

frequently will intervention be necessary for cleaning

the internal parts, such as the grate and the

combustion chamber.

The main certifications of quality for pellets in the European market are

DINplus and Ö-Norm M7135; these ensure respect of:

 Calorific power: 4.9 kWh/kg

 Water content: max 10% of weight

 Percentage of ashes: max 0,5% of weight

 Diameter: 5 – 6mm

 Length: max 30mm

 Contents: 100% untreated wood, with no added bonding

substances (bark percentage 5% max)

 Packaging: in sacks made from ecologically compatible or

biologically decomposing material

Fuel pellets

15 Kg sack of fuel

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 47 48

Commentaires sur ces manuels

Pas de commentaire

RED ORCHIDEA Instructions d'exploitation Page 11

Commentaires sur ces manuels