Today, the need for alternative fuel sources is clear. Our faith on fossil fuels is no longer sustainable or affordable. There is a limited supply of fossil fuels, in addition to as the global population continues to increase at an accelerating rate, those supplies cannot meet the demands of a rising population. Also, fossil fuels are now known to be a key contributor to climate change plus carbon emissions. Therefore the need for renewable energy sources such as biomass is driven on energy resource, charge in addition to environmental concerns. The issue is how do we capture the energy from biomass. Biomass in its unrefined form is not an ideal energy source. Wood generally has a low bulk density in addition to therefore also a low fuel density. Also the moisture content of raw wood is generally too high to provide efficient combustion. Therefore the biomass requires processing into a more useable form of energy. Pellets are component of that biomass solution.
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As discussed, wood in its raw form is not ideal as an energy source through its low density plus high moisture content. One of the simplest ways to turn wood into a highly efficient plus cheap form of energy is to compress the wood matter into pellets. Pellets are in the shape of small cylinders, which for energy pellets are usually 6 or 8mm in diameter. Pellets have a much higher bulk and fuel density compared to the raw material and also a much lower moisture content below 10%. This enables the pellets to burn much more efficiently than raw wood. There are also developments to create biomass pellets even more efficient, along with have a higher energy density. One interesting practice is torrefaction. Torrefaction is where the wood is heated to between 200 in addition to 300 degrees, along with a lot of the unwanted volatiles which diminish incineration efficiency are burnt off. What is left is a much purer form of carbon which not only burns much more more efficiently than standard wood as well as wood pellets, it also have quite a lot of other payback. This payback include being hydrophobic, which means the pellets are not susceptible to moisture as fuel pellets presently are. Torrefied wood in addition to wood pellets are gaining ground, and are the future.
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Converting wood fuel into pellets brings dwelling heating with solid wood fuel away from high maintenance log stoves into the 21st century. Modern pellet stoves and boilers have a range of automated features which decrease the work load of the owner. For instance fuel hoppers on pellet burners usually hold at least a days worth of energy. Yet some have large external hoppers which hold a years supply. Due to the demand for fuel from wood in addition to a greater demand for pellets, interest in pellet construction has also grown significantly. Generating quality energy pellets requires quite a lot of pieces of apparatus from chippers, hammer mills, dryers plus pellets mills also known as pellet machines and pellet press. Operating this gear requires a precise knowledge of what each material requires to manufacture quality pellets.
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