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Applying CEN StandardsPrepared by Louise Simmonds

TV Energy

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General

• CEN Standards are currently in draft format

• Final approval should be in November 2010

• When CEN standards are approved, National standards should be withdrawn or adopted to CEN standards

• Standards classifyOrigin/Source materialTraded form e.g. wood chipSpecification of propertiesTypical values

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Applying CEN Standards

CEN Standards are useful for Buyers and Sellers of Wood

Fuel

Boilers will require fuel to specific CEN standards

Methods covered and characteristics that can easily be measured include

SamplingParticle sizeBulk densityMoisture content

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CEN/TS 14961 Fuel specifications and classes

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Fuel specifications

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Sampling

CEN/TS 14778-1 Solid biofuels - Sampling

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CEN/TS 15149-parts 1,2 and 3Determination of particle size distribution

ONORM=GCEN=P

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Particle Size

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Bulk Density

CEN/TS 15103 Determination of bulk density

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Moisture content

CEN/TS 14774-parts 1,2 and 3Determination of moisture content

ONORM=WCEN=M

The moisture content of woodchip is normally expressed as a % of total weight (wet basis)

MC (%) wet basis = ((Wet weight – Dry Weight)/ Wet weight) x 100)

 MeasurementWeigh a sample of wet chip, dry using a fan oven at 105 C Weigh until dry, use calculation above to give moisture content.

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More information

Copies of the draft CEN Standards are available to download from the Biomass Energy Centre web site

http://www.biomassenergycentre.org.uk

http://www.tvenergy.org/

By the way….CEN stands for “Comite Europeen de Normalisation”Or “European Committee for Standardization”