Biomass briquettes and pellets are both forms of solid biofuels, but they differ significantly in their production processes, physical properties, and applications. Biomass pellets are typically made from finely ground materials that are compressed without the addition of binders, whereas briquettes can be made from a variety of materials and often require binders. Pellets are favored for their suitability in automated combustion systems due to their uniform size and shape, while briquettes are often used in larger, more manual combustion setups.
Production Process:
- Pellets: The process of making pellets involves grinding the raw material into a fine fraction and adjusting the moisture content to a specific range. This process is energy-intensive and requires high investment due to the high wear on the machinery from the high surface-to-volume ratio of the pellets. The raw materials, such as pure sawdust and shavings, are compressed at high temperatures, causing moisture to flash off, resulting in pellets with a final moisture content of 7-10%.
- Briquettes: Briquettes can be made from a wider range of materials, including those that are not suitable for pellet production. The process may involve the use of binders and can vary in complexity depending on the type of biomass used.
Physical Properties:
- Pellets: They are small, uniform in size and shape, and have a high energy density. Their properties allow for easy transport and handling, including pneumatic and screw conveyor transport, which is ideal for small combustion plants.
- Briquettes: They are typically larger and denser than pellets, often requiring manual handling and feeding into combustion systems. The use of binders can affect their combustion properties and efficiency.
Applications:
- Pellets: Their uniform size and shape, along with their loose material properties, make them ideal for automated combustion systems in small equipment. They burn with a steady and smooth flame, providing consistent heat output.
- Briquettes: They are more commonly used in larger, less automated systems where manual handling is feasible. Their larger size and potentially non-uniform composition can affect combustion efficiency and may require more attention during use.
In summary, while both biomass briquettes and pellets serve as renewable energy sources, the choice between them depends on the specific requirements of the combustion system, the availability and type of raw materials, and the desired level of automation in fuel handling and combustion control.
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