Wood Pellets
Wood pellets are shavings and sawdust compressed at high pressure to give small pellets which are of a uniform nature. Due to the resulting dense material, they are highly calorific in nature and therefore need a more compact storage area compared to the same output of wood chips. Their uniformity produces consistency in boiler operation enabling automated systems similar to those offered by oil and gas boilers.
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Due to the low residual ash produced on combustion...
Due to the low residual ash produced on combustion, wood pellets offer a convenient fuel source requiring minimal maintenance. Most wood pellet boilers supplied by Ashwell Biomass come with auto ash removal options.
Wood pellets can vary in quality dependent on their dust content and uniformity, hence there is usually a range of prices available. They need to be stored under cover to ensure that the moisture content remains low as this affects the boiler efficiency.
Wood pellets are usually transported in bulk loads at regular intervals and so the sizing of the storage bunkers to suit the output required is an important factor.
In summary:
- Cleaner than logs or woodchip
- More compact fuel storage required compared to woodchip (up to seven times smaller)
- High calorific value – better than logs or wood chip
- Uniformity means consistent and reliable output
- Wood pellets are free flowing and easy to regulate
- Due to their nature, boiler can incorporate fully automated ignition complete with ash removal and modulating control
- Low residual ash content means minimal ash removal required. Some boilers incorporate automatic ash removal
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