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Ash (A )

Length (L). Moisture (M ). Ash (A ). Mechanical Durability (DU). Fines, F . Ash Melting Behaviour (DT ).

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Ash (A )

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  1. Length (L) Moisture (M) Ash (A) Mechanical Durability (DU) Fines, F Ash Melting Behaviour (DT)

  2. Length- is important for successful movement of pellets from the hopper into the boiler system. Long pellets can cause disruption in the auger / suction feeds- blocking them and causing damage to surrounding pellets. Equally, very short pellets can break apart easier and cause a higher fines content in the hopper. Moisture- there should not be a high % of moisture within a pellet, but likewise the pellet shouldn’t possess a very low moisture content. <10% is optimum because the pellets are not too dry that they become very hard, nor too soft that they decay and break easily. Ash- is a very good fertiliser but whilst soils may like it, biomass burners don’t! Pellets should have a very low ash content for cleaner burning – although it is a component which will always remain in pellets due to the timber raw material.

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