Remeha Generic Wood Chip Specifications
Wood Chip Specification
The quality of the fuel used can have a significant impact on the reliability and
the life of the boiler.
The use of contaminated material can lead to breaches of emissions and
waste regulations as well as long term damage to the heating system.
We would recommend using wood chips rather than sh redded wood
De-barked wood for wood chips reduces the ash content of the fuel, therefore
benefits an automated boiler system, reducing the need for human intervention
for servicing.
We recommend as a minimum the fuel should comply with the following
specifications;
Wood Chips Classification acc. To OENORM M7133
Description
Edge Length Max 85mm 120mm 250mm Single
Pieces
Retained in coarse sieve Max. 20% Max. 20% Max. 20%
Coarse sieve mesh 16 x 16mm 31.5 x 31.5mm 63 x 63mm
Retained in medium sieve 60 to 100% 60 to 100% 60 to 100%
Main Quantity nominal length 30mm 50mm 100mm
Medium sieve mesh 2.8 x 2.8mm 5.6 x 5.6mm 11.2 x 11.2mm
Passing medium s i ev e Max. 20% Max. 20% Max. 20%
Fine sieve me sh 1 x 1mm 1 x 1mm 1 x 1mm
Passing fine si ev e Max. 4% Max. 4% Max.4%
Water Content
Class Class Limits
W20 < 19.99%
W30 20 – 29.99%
W35 30 – 34.99%
W40 35 – 39.99%
W50 40 – 49.99%
Ash Content
Class Class Limits
A1 < 1%
A2 1 – 1.5%
Cross Section Max 3cm
G30 Size G50 Size G100 Size
2
Small Ash Cont ent
Higher Ash Content
5cm2 10cm2
Size Classification
Domestic boilers up to HPK-RA 160: G50 chips, W30
Industrial boilers 150kW to 2000kW: G50 or G100 size depending on transport
system and depending on boiler type the maximum moisture content allowable
is:
HPKI-K 40%, HPKI-R 60%, HPKI-W 45%
Industrial boilers with walking floor fuel transport system may run on G100.
Note
The nominal output for industrial boilers is calculated at 40%
Material Density
For all our boilers we recommend 200kg/m3 i.e. medium density.
Ash Content
Ash content- preferably A2
Contamination
The origin wood must also be free from general contamination such as:slate, stones, metal, rubber, plastic & other unidentified foreign bodi es, heavy
metal compounds as a result of treatment (e.g. Copper chrome Arsenate(CCA)
identified by green colour), halogenated organic compou nds , e.g. lindane
(identified by yellow colour), creosote (identified by dark brown stain and
smell), painted wood, MDF, hardboard and fibreboard.
If the fuel used to operate the boiler(s) does not meet the attached wood chip
specification, Broag Ltd cannot guarantee the performance of the boilers and
physical damage or incapacitation of the boilers and fuel transport system may
result. Furthermore should Broag Ltd be called out to site to intervene as a
result of the boiler(s) being operated using inferior fuel, our labour and any
replacement parts required to rectify the situation will be chargeable items.
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